BibTeX-Key | Author / Editor / Organization | Title | Year | Journal / Proceedings / Book | BibTeX type | Keywords |
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AdaHarOwe1979 | Adam, C.D.; Owen, J. & Harker, A.H. | Ligand polarisation and transferred hyperfine interactions | 1979 |
Journal of Physics C: Solid State Physics Vol. 12 (6) , pp. L239 |
article | |
Abstract: Recent ENDOR measurements of transferred hyperfine interactions in
the linear structure M 3+ -F - -Cd 2+ , where M 3+ =Fe 3+ or Cr 3+ and the host lattice is CsCdF 3 , have given anomalous results when interpreted by standard ligand hyperfine structure theory. The data have therefore been reinterpreted allowing for polarisation of the F - ligand by the electric field from its neighbours. This is found to improve agreement between theory and experiment, especially if the fluoride ion is allowed to relax towards the M 3+ ion, but some difficulties still remain. |
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BibTeX:
@article{AdaHarOwe1979, author = {Adam, C D and Owen, J and Harker, A H}, title = {Ligand polarisation and transferred hyperfine interactions}, journal = {Journal of Physics C: Solid State Physics}, year = {1979}, volume = {12}, number = {6}, pages = {L239}, url = {http://stacks.iop.org/0022-3719/12/i=6/a=006} } |
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BroGalHarStoVin2011 | Brookes, J.C.; Galigniana, M.D.; Harker, A.H.; Stoneham, A.M. & Vinson, G.P. | System among the corticosteroids: specificity and molecular dynamics | 2012 |
Journal of The Royal Society Interface Vol. 9 , pp. 43-53 |
article | |
Abstract: Understanding how structural features determine specific biological
activities has often proved elusive. With over 161 000 steroid structures described, an algorithm able to predict activity from structural attributes would provide manifest benefits. Molecular simulations of a range of 35 corticosteroids show striking correlations between conformational mobility and biological specificity. Thus steroid ring A is important for glucocorticoid action, and is rigid in the most specific (and potent) examples, such as dexamethasone. By contrast, ring C conformation is important for the mineralocorticoids, and is rigid in aldosterone. Other steroids that are less specific, or have mixed functions, or none at all, are more flexible. One unexpected example is 11-deoxycorticosterone, which the methods predict (and our activity studies confirm) is not only a specific mineralocorticoid, but also has significant glucocorticoid activity. These methods may guide the design of new corticosteroid agonists and antagonists. They will also have application in other examples of ligandâ€“receptor interactions. |
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BibTeX:
@article{BroGalHarStoVin2011, author = {Brookes, Jennifer C and Galigniana, Mario D and Harker, Anthony H and Stoneham, A Marshall and Vinson, Gavin P}, title = {System among the corticosteroids: specificity and molecular dynamics}, journal = {Journal of The Royal Society Interface}, year = {2012}, volume = {9}, pages = {43-53}, url = {http://rsif.royalsocietypublishing.org/content/early/2011/05/20/rsif.2011.0183.abstract}, doi = {https://doi.org/10.1098/rsif.2011.0183} } |
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CatHarHay1975 | Catlow, C.R.A.; Harker, A.H. & Hayns, M.R. | Ab-initio studies of non-bonded hydrocarbon potentials | 1975 |
Journal of the Chemical Society-Faraday Transactions II Vol. 71 (2) , pp. 275-285 |
article | |
Abstract: Results are reported of ab initio molecular orbital calculations of
the energies of interaction of hydrogen and methane molecules. The aim in the former case is to provide a detailed analysis of the short range repulsive potential for this interaction, an interaction which is also relevant to the general field of hydrocarbon potentials, while the second set of calculations are intended to provide guidance as to models and parameters for saturated hydrocarbons. The results suggest that the repulsive interactions between bonds containing hydrogen may be adequately described by an isotropic interaction between centres located along the internuclear axis of the bond; and that the use of a larger number of parameters in atom?atom models may be unnecessary. |
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BibTeX:
@article{CatHarHay1975, author = {Catlow, C R A and Harker, A H and Hayns, M R}, title = {Ab-initio studies of non-bonded hydrocarbon potentials}, journal = {Journal of the Chemical Society-Faraday Transactions II}, year = {1975}, volume = {71}, number = {2}, pages = {275-285} } |
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ChoHarSto2004 | Choy, T.C.; Harker, A.H. & Stoneham, A.M. | Field emission theory for an enhanced surface potential: a model for carbon field emitters | 2004 |
Journal of Physics: Condensed Matter Vol. 16 (6) , pp. 861-880 |
article | |
BibTeX:
@article{ChoHarSto2004, author = {Choy, T C and Harker, A H and Stoneham, A M}, title = {Field emission theory for an enhanced surface potential: a model for carbon field emitters}, journal = {Journal of Physics: Condensed Matter}, year = {2004}, volume = {16}, number = {6}, pages = {861-880}, note = {AHH} } |
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ChoStoHar2005 | Choy, T.C.; Harker, A.H. & Stoneham, A.M. | Dynamical resonance tunnelling - a theory of giant emission from carbon field emitters | 2005 |
Journal of Physics: Condensed Matter Vol. 17 (10) , pp. 1505-1528 |
article | |
BibTeX:
@article{ChoStoHar2005, author = {Choy, T C and Harker, A H and Stoneham, A M}, title = {Dynamical resonance tunnelling -- a theory of giant emission from carbon field emitters}, journal = {Journal of Physics: Condensed Matter}, year = {2005}, volume = {17}, number = {10}, pages = {1505-1528}, note = {AHH} } |
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EltStrEdiHar2016 | Eltayeb, M.; Stride, E.; Edirisinghe, M. & Harker, A. | Electrosprayed nanoparticle delivery system for controlled release | 2016 |
Materials Science and Engineering: C Vol. 66 , pp. 138 -146 |
article | electrohydrodynamic processing, controlled release, lipid nanoparticles |
Abstract: This study utilises an electrohydrodynamic technique to prepare core-shell
lipid nanoparticles with a tunable size and high active ingredient loading capacity, encapsulation efficiency and controlled release. Using stearic acid and ethylvanillin as model shell and active ingredients respectively, we identify the processing conditions and ratios of lipid:ethylvanillin required to form nanoparticles. Nanoparticles with a mean size ranging from 60 to 70 nm at the rate of 1.37× 10^9 nanoparticles per minute were prepared with different lipid:ethylvanillin ratios. The polydispersity index was ≈ 21% and the encapsulation efficiency ≈ 70%. It was found that the rate of ethylvanillin release was a function of the nanoparticle size, and lipid:ethylvanillin ratio. The internal structure of the lipid nanoparticles was studied by transmission electron microscopy which confirmed that the ethylvanillin was encapsulated within a stearic acid shell. Fourier transform infrared spectroscopy analysis indicated that the ethylvanillin had not been affected. Extensive analysis of the release of ethylvanillin was performed using several existing models and a new diffusive release model incorporating a tanh function. The results were consistent with a core-shell structure. |
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BibTeX:
@article{EltStrEdiHar2016, author = {Eltayeb, Megdi and Stride, Eleanor and Edirisinghe, Mohan and Harker, Anthony}, title = {Electrosprayed nanoparticle delivery system for controlled release }, journal = {Materials Science and Engineering: C }, year = {2016}, volume = {66}, pages = {138 -146}, url = {http://www.sciencedirect.com/science/article/pii/S0928493116302995}, doi = {https://doi.org/10.1016/j.msec.2016.04.001} } |
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FisHarHarSto1991 | Fisher, A.J.; Harding, J.H.; Harker, A.H. & Stoneham, A.M. Grimes, R.W.; Catlow, C.R.A. & Shluger, A.L. (Hrsg.) | Embedded Cluster Calculations of Defect Processes | 1991 |
Reviews of Solid State Science Vol. 5 Quantum Mechanical Cluster Calculations in Solid State Studies , pp. 133-147 |
article | |
BibTeX:
@article{FisHarHarSto1991, author = {Fisher, A J and Harding, J H and Harker, A H and Stoneham, A M}, title = {Embedded Cluster Calculations of Defect Processes}, booktitle = {Quantum Mechanical Cluster Calculations in Solid State Studies}, journal = {Reviews of Solid State Science}, year = {1991}, volume = {5}, pages = {133-147}, note = {ICECAP} } |
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Har1973a | Harker, A.H. | The F centre in magnesium fluoride | 1973 |
Journal of Physics C: Solid State Physics Vol. 6 (20) , pp. 2993 |
article | |
Abstract: Point-ion calculations with ion-size corrections of the electronic
structure of the F centre in rm MgF_2 predict a transition energy close to the experimental value of 4.8 eV. The hyperfine interactions with the first six shells of fluoride ions are well represented by the variational wavefunction orthogonalized to orthonormal core orbitals. |
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BibTeX:
@article{Har1973a, author = {Harker, A H}, title = {The F centre in magnesium fluoride}, journal = {Journal of Physics C: Solid State Physics}, year = {1973}, volume = {6}, number = {20}, pages = {2993}, url = {http://stacks.iop.org/0022-3719/6/i=20/a=013} } |
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Har1973b | Harker, A.H. | The F centre in potassium magnesium fluoride | 1973 |
Journal of Physics C: Solid State Physics Vol. 6 (23) , pp. 3349 |
article | |
Abstract: Calculations of the electronic structure of the F centre in rm KMgF_3
are reported and their results compared with experiment. The hyperfine interaction of the ground state with the nearest rm F^- ion is predicted to be 70 G, in good agreement with the experimental result of 60 G. The energy for optical absorption to the E u excited state is given by a point-ion calculation as 4.4 eV, compared with the observed 4.6 eV. The predicted spin-orbit splitting of the excited state is 57rm cm^-1 , close to the experimental value of 60rm cm^-1 . |
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BibTeX:
@article{Har1973b, author = {Harker, A H}, title = {The F centre in potassium magnesium fluoride}, journal = {Journal of Physics C: Solid State Physics}, year = {1973}, volume = {6}, number = {23}, pages = {3349}, url = {http://stacks.iop.org/0022-3719/6/i=23/a=009} } |
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Har1974 | Harker, A.H. | Orthogonalization procedures in the theory of colour centre hyperfine interactions | 1974 |
Journal of Physics C: Solid State Physics Vol. 7 (18) , pp. 3224 |
article | |
Abstract: In many colour centre calculations, a true wavefunction must be obtained
from an envelope function or pseudo-wavefunction. The author compares four levels of approximation for such calculations. The true wavefunctions are used to calculate contact hyperfine interactions of model centres in LiCl, KCl, RbF, as well as the F + centre in BeO and neutral interstitial hydrogen in CaF 2 . It is shown that commonly used approximations can be very inaccurate, and in particular that inclusion only of first-order terms in the overlap between core orbitals can yield erroneous results. Selected tables of core overlaps are included in the text. An exact core orthogonalization procedure not only corrects a tendency to point-ion pseudo-wavefunctions for F centres to overestimate spin densities on the nearest neighbours, but also seem relatively insensitive to the choice of core wavefunctions. |
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BibTeX:
@article{Har1974, author = {Harker, A H}, title = {Orthogonalization procedures in the theory of colour centre hyperfine interactions}, journal = {Journal of Physics C: Solid State Physics}, year = {1974}, volume = {7}, number = {18}, pages = {3224}, url = {http://stacks.iop.org/0022-3719/7/i=18/a=008} } |
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Har1976 | Harker, A.H. | Molecular Orbital Methods in Materials Science | 1976 |
Nuclear Metallurgy Vol. 20 , pp. 1254 |
article | |
BibTeX:
@article{Har1976, author = {Harker, A H}, title = {Molecular Orbital Methods in Materials Science}, journal = {Nuclear Metallurgy}, year = {1976}, volume = {20}, pages = {1254} } |
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Har1976a | Harker, A.H. | Theoretical calculations of magnetic and optical properties of alkali halide F centres | 1976 |
Journal of Physics C: Solid State Physics Vol. 9 (12) , pp. 2273 |
article | |
Abstract: F-centre wavefunctions, calculated in the point-ion and ion-size approximations,
and Lowdin-orthogonalized free-ion wavefunctions are used to derive hyperfine interactions of the ground state and orbital g-factors and spin-orbit coupling constants of the first excited state, for all 20 alkali halides. The ion-size correction leads to improved values of the transition energies (mean deviation from experiment <10%) and spin-orbit constants (15%), but some of the hyperfine constants are in error by factors of up to 2. |
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BibTeX:
@article{Har1976a, author = {Harker, A H}, title = {Theoretical calculations of magnetic and optical properties of alkali halide F centres}, journal = {Journal of Physics C: Solid State Physics}, year = {1976}, volume = {9}, number = {12}, pages = {2273}, url = {http://stacks.iop.org/0022-3719/9/i=12/a=010} } |
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Har1976b | Harker, A.H. | rm F^+ centres in wurtzite lattices. I. The effects of host lattice covalence | 1976 |
Journal of Physics C: Solid State Physics Vol. 9 (17) , pp. 3141 |
article | |
Abstract: Principles of calculating the electronic structure of the F + centre
in partially covalent solids are discussed. A bond-orbital model of the perfect lattice is described, and the effects of this covalence on the F + centre energy levels and hyperfine interactions are investigated. The effective-charge method of treating covalent crystals is critically examined, and rejected in favour of an ionic ion-size model for variational calculations. The covalence is less important in calculating wavefunctions than in using the wavefunctions to derive hyperfine interactions. Lattice distortions give only small changes in transition energies, but are extremely important in determining the hyperfine interactions. |
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BibTeX:
@article{Har1976b, author = {Harker, A H}, title = {rm F^+ centres in wurtzite lattices. I. The effects of host lattice covalence}, journal = {Journal of Physics C: Solid State Physics}, year = {1976}, volume = {9}, number = {17}, pages = {3141}, url = {http://stacks.iop.org/0022-3719/9/i=17/a=009} } |
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Har1976c | Harker, A.H. | Effect of Choice of Basis Set in Molecular Pseudopotential Calculations | 1976 |
Molecular Physics Vol. 32 (2) , pp. 583-586 |
article | |
BibTeX:
@article{Har1976c, author = {Harker, A H}, title = {Effect of Choice of Basis Set in Molecular Pseudopotential Calculations}, journal = {Molecular Physics}, year = {1976}, volume = {32}, number = {2}, pages = {583-586} } |
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Har1978 | Harker, A.H. | rm F^+ centres in wurtzite lattices. II. Zinc oxide, zinc sulphide and beryllium oxide | 1978 |
Journal of Physics C: Solid State Physics Vol. 11 (6) , pp. 1059 |
article | |
Abstract: For pt.I see ibid., vol.9, p.3141 (1976). Two different pseudopotential
methods are used, one approximate and one retaining all two-centre integrals, to study F-centres. The more detailed method is tested on the F-centre in cubic NaCl, where it gives isotropic hyperfine constants for the first two shells of ions which are within 20% of the experimental values. In the wurtzite crystals, the calculated transition energies are significantly larger than those measured. The hyperfine constants are sufficiently close for the discrepancy between theory and experiment to be attributed to lattice distortions, but the observed difference between the values for axial and basal nearest neighbours is not predicted. A detailed treatment of lattice distortion is probably essential for both this difference among the hyperfine constants and for an accurate estimate of the transition energies. |
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BibTeX:
@article{Har1978, author = {Harker, A H}, title = {rm F^+ centres in wurtzite lattices. II. Zinc oxide, zinc sulphide and beryllium oxide}, journal = {Journal of Physics C: Solid State Physics}, year = {1978}, volume = {11}, number = {6}, pages = {1059}, url = {http://stacks.iop.org/0022-3719/11/i=6/a=013} } |
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Har1985 | Harker, A.H. | Numerical modelling of the Scattering of Elastic Waves in Plates | 1985 |
Journal of Nondestructive Evaluation Vol. 4 , pp. 89-106 |
article | |
Abstract: This paper describes the application of finite difference methods
to the calculation of the scattering of elastic waves. The emphasis is on cracklike defects in plates, and it is shown that a common numerical technique can span a range of wavelengths from Lamb waves to ultrasonic waves with many reflections from the surfaces of the plate. Quantitative results are given for the scattering of Lamb waves and ultrasonic shear waves from surface-breaking cracks. |
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BibTeX:
@article{Har1985, author = {Harker, A H}, title = {Numerical modelling of the Scattering of Elastic Waves in Plates}, journal = {Journal of Nondestructive Evaluation}, year = {1985}, volume = {4}, pages = {89-106} } |
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HarHarKeePanVaiWoo1985 | Harding, J.H.; Harker, A.H.; Keegstra, P.B.; Pandey, R.; Vail, J.M. & Woodward, C. | Hartree-Fock Cluster Computations Of Defect And Perfect Ionic Crystal Properties | 1985 |
Physica B & C Vol. 131 (1-3) , pp. 151-156 |
article | |
BibTeX:
@article{HarHarKeePanVaiWoo1985, author = {Harding, J H and Harker, A H and Keegstra, P B and Pandey, R and Vail, J M and Woodward, C}, title = {Hartree-Fock Cluster Computations Of Defect And Perfect Ionic Crystal Properties}, journal = {Physica B & C}, year = {1985}, volume = {131}, number = {1-3}, pages = {151-156}, note = {ICECAP} } |
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HarLar1979a | Harker, A.H. & Larkins, F.P. | Large Unit-Cell Semi-Empirical Molecular-Orbital Approach to the Properties of Solids .1. General Theory | 1979 |
Journal of Physics C: Solid State Physics Vol. 12 (13) , pp. 2487-2495 |
article | |
Abstract: Two semiempirical crystal orbital schemes are outlined for the calculation
of the properties of perfect and defective solids. Both use periodic boundary conditions with a large unit cell (LUC) to map special points of the Brillouin zone onto the point k=0. One method involves the complete neglect of differential overlap (LUC-CNDO), the other uses intermediate neglect of differential overlap (LUC-INDO). The determination of parameter sets for the elements is discussed. |
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BibTeX:
@article{HarLar1979a, author = {Harker, A H and Larkins, F P}, title = {Large Unit-Cell Semi-Empirical Molecular-Orbital Approach to the Properties of Solids .1. General Theory}, journal = {Journal of Physics C: Solid State Physics}, year = {1979}, volume = {12}, number = {13}, pages = {2487-2495} } |
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HarLar1979b | Harker, A.H. & Larkins, F.P. | Large Unit-Cell Semi-Empirical Molecular-Orbital Approach to the Properties of Solids .2. Covalent Materials - Diamond and Silicon | 1979 |
Journal of Physics C: Solid State Physics Vol. 12 (13) , pp. 2497-2508 |
article | |
Abstract: For pt.I see ibid., vol.12, p.2487 (1979). Some properties of diamond
and silicon crystals have been calculated using a large unit cell-complete neglect of differential overlap (LUC-CNDO) crystal orbital approach. The dependence of the predictions on the parameter set chosen, on the size and shape of the large unit cell and on the cut-off distance for atomic interactions has been investigated. The results obtained for the perfect solid with a near-optimum parameter set are, in general, in good agreement with experimental values. |
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BibTeX:
@article{HarLar1979b, author = {Harker, A H and Larkins, F P}, title = {Large Unit-Cell Semi-Empirical Molecular-Orbital Approach to the Properties of Solids .2. Covalent Materials - Diamond and Silicon}, journal = {Journal of Physics C: Solid State Physics}, year = {1979}, volume = {12}, number = {13}, pages = {2497-2508} } |
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HarLar1979c | Harker, A.H. & Larkins, F.P. | Large Unit-Cell Semi-Empirical Molecular-Orbital Approach to the Properties of Solids .3. Ionic-Crystals - Lithium Fluoride and Potassium Chloride | 1979 |
Journal of Physics C: Solid State Physics Vol. 12 (13) , pp. 2509-2517 |
article | |
Abstract: For pt.II see ibid., vol.12, p.2497 (1979). A large unit cell-complete
neglect of differential overlap (LUC-CNDO) method has been used to predict some properties of lithium fluoride and potassium chloride crystals. A 16 atom cell and a parameter set chosen to match the properties of the relevant diatomic molecules form a basis for the calculation. The results are compared with predictions from a 27 atom cluster model, with previous band-structure calculations and with experiment. It is concluded that the approach has great potential for the study of ionic solids with and without defects. |
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BibTeX:
@article{HarLar1979c, author = {Harker, A H and Larkins, F P}, title = {Large Unit-Cell Semi-Empirical Molecular-Orbital Approach to the Properties of Solids .3. Ionic-Crystals - Lithium Fluoride and Potassium Chloride}, journal = {Journal of Physics C: Solid State Physics}, year = {1979}, volume = {12}, number = {13}, pages = {2509-2517} } |
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HarLyoWas1977 | Harker, A.H.; Lyon, S.B. & Wasiela, A. | Electronic structure of the self-trapped exciton in the potassium halides | 1977 |
Solid State Communications Vol. 21 (11) , pp. 1053 - 1055 |
article | |
Abstract: We present pseudopotential calculations of the energy levels and wave-functions
of the electron associated with the self-trapped exciton in KCl, KBr and KI. Accurate values are obtained for the separation of the singlet and triplet luminescent bands, for the electronic transitions, and for the spin resonance linewidths. Lattice distortion is shown to be particularly important in KCl. Additional low-energy electronic transitions, at 0.7 eV in KCl and 0.94 eV in KBr, are predicted, but have not been seen experimentally. |
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BibTeX:
@article{HarLyoWas1977, author = {Harker, A H and Lyon, S B and Wasiela, A}, title = {Electronic structure of the self-trapped exciton in the potassium halides}, journal = {Solid State Communications}, year = {1977}, volume = {21}, number = {11}, pages = {1053 - 1055}, url = {http://www.sciencedirect.com/science/article/pii/0038109877900175}, doi = {https://doi.org/10.1016/0038-1098(77)90017-5} } |
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HarOgi1991 | Harker, A.H. & Ogilvy, J.A. | Coherent Wave Propagation in Inhomogeneous Materials - a Comparison of Theoretical Models | 1991 |
Ultrasonics Vol. 29 (3) , pp. 235-244 |
article | |
Abstract: The frequency dependent behaviour of coherent wave propagation in
inhomogeneous materials is studied using several theoretical models. The predictions of a ray tracing model are compared with those of a two-dimensional finite difference model, for both isotropic and anisotropic inhomogeneous materials. The effects of frequency are studied and it is shown how the ray tracing model may be modified to incorporate the low frequency regime, in addition to the usual high frequency regime for which ray tracing approximations are valid. A further comparison is made between the ray tracing solution and an analytical solution, for electromagnetic plane waves propagating in a material with a one-dimensionally varying dielectric constant. The amplitude of the reflected wave is calculated, with good agreement between the two models over a wide range of frequencies, including low frequencies. |
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BibTeX:
@article{HarOgi1991, author = {Harker, A H And Ogilvy, J A}, title = {Coherent Wave Propagation in Inhomogeneous Materials - a Comparison of Theoretical Models}, journal = {Ultrasonics}, year = {1991}, volume = {29}, number = {3}, pages = {235-244} } |
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HarOgiTem1990 | Harker, A.H.; Ogilvy, J.A. & Temple, J.A.G. | Modelling ultrasonic inspection of austenitic welds | 1990 |
Journal of Nondestructive Evaluation Vol. 9 (2/3) , pp. 155 |
article | |
Abstract: The strength of austenitic welds will be considerably reduced if cracks
are present. To guard against this possibility good workmanship is essential; quality is monitored by inspecting the welds after manufacture. Ultrasound is the favored method of inspection but there are difficulties associated with this in the coarse-grained columnar weld structures often associated with austenitic materials. We present two different approaches to modeling such inspections: ray tracing and full numerical solution of the governing wave equation. We show that the two approaches, although very different in physical nature and numerical method, give similar and consistent results. |
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BibTeX:
@article{HarOgiTem1990, author = {Harker, A H and Ogilvy, J A and Temple, J A G}, title = {Modelling ultrasonic inspection of austenitic welds}, journal = {Journal of Nondestructive Evaluation}, year = {1990}, volume = {9}, number = {2/3}, pages = {155} } |
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HarSchStiTayTem1991 | Harker, A.H.; Schofield, P.; Stimpson, B.P.; Taylor, R.G. & Temple, J.A.G. | Ultrasonic Propagation in Slurries | 1991 |
Ultrasonics Vol. 29 (6) , pp. 427-438 |
article | |
Abstract: Experimental measurements have been made of the ultrasonic velocity
and attenuation in some simple suspensions of, mainly, silicon carbide in water and in ethylene glycol. These are compared with theoretical predictions based on a novel hydrodynamic model. Predicted ultrasonic velocities are in excellent agreement with the measured values. Predicted and measured ultrasonic attenuations do not agree as well. However, the suspensions give rise to excess attenuations rising to a few hundred nepers per metre and special experimental techniques were needed to measure ultrasonic properties. To predict attenuations to within, say, 20% for mixtures such as these is a major achievement, |
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BibTeX:
@article{HarSchStiTayTem1991, author = {Harker, A H and Schofield, P and Stimpson, B P and Taylor, R G and Temple, J A G}, title = {Ultrasonic Propagation in Slurries}, journal = {Ultrasonics}, year = {1991}, volume = {29}, number = {6}, pages = {427-438} } |
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HarTem1988 | Harker, A.H. & Temple, J.A.G. | Velocity and Attenuation of Ultrasound in Suspensions of Particles in Fluids | 1988 |
Journal of Physics D-Applied Physics Vol. 21 (11) , pp. 1576-1588 |
article | |
Abstract: The theory of the scattering of compression waves in viscous fluids
is examined. The effects of fluid viscosity, of differences in density and in elastic modulus between the particles and the fluid, of heat transfer and of concentration are considered. Ultrasonic phase velocity and attenuation are derived. Results for the phase velocity are compared with several other formulations. The feasibility of using ultrasound to characterise suspensions is discussed. |
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BibTeX:
@article{HarTem1988, author = {Harker, A H And Temple, J A G}, title = {Velocity and Attenuation of Ultrasound in Suspensions of Particles in Fluids}, journal = {Journal of Physics D-Applied Physics}, year = {1988}, volume = {21}, number = {11}, pages = {1576-1588} } |
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HarVai1981 | Harker, A.H. & Vail, J.M. | Theoretical Analysis of Some Ground State and Optical Properties of Impurity F Centers | 1981 |
physica status solidi (b) Vol. 108 (1) , pp. 87-96 |
article | |
BibTeX:
@article{HarVai1981, author = {Harker, A H and Vail, J M}, title = {Theoretical Analysis of Some Ground State and Optical Properties of Impurity F Centers}, journal = {physica status solidi (b)}, year = {1981}, volume = {108}, number = {1}, pages = {87-96} } |
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HedSpaHar1980 | Heder, G.; Spaeth, J.M. & Harker, A.H. | Electronic structure of atomic hydrogen at anion sites in KCl | 1980 |
Journal of Physics C: Solid State Physics Vol. 13 (26) , pp. 4965 |
article | |
Abstract: Theoretical calculations are presented of the hyperfine and superhyperfine
interactions of H s,a 0 centres (atomic hydrogen at anion site) in KCl in various models. Ligand polarisation by unscreened charges proves very important for the interpretation of the experimental data. The experimental hyperfine and superhyperfine interactions can be explained satisfactorily by a configuration mixing of the states H 0 -Cl - -K + , H - -Cl 0 -K + and H - -Cl - -K 2+ , in which ligand polarisation effects, localised vibrations of hydrogen and the displacements of nearest neighbours due to the charge of the anion vacancy are taken into account. The results illustrate what may be a general phenomenon: modest charge transfers from weak covalency can have their main effect by polarising neighbouring ions. |
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BibTeX:
@article{HedSpaHar1980, author = {Heder, G and Spaeth, J M and Harker, A H}, title = {Electronic structure of atomic hydrogen at anion sites in KCl}, journal = {Journal of Physics C: Solid State Physics}, year = {1980}, volume = {13}, number = {26}, pages = {4965}, url = {http://stacks.iop.org/0022-3719/13/i=26/a=017} } |
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HeuMitWuFisKerStoHarGarTseJonRenAep2007 | Heutz, S.; Mitra, C.; Wu, W.; Fisher, A.J.; Kerridge, A.; Stoneham, M.; Harker, T.H.; Gardener, J.; Tseng, H.-H.; Jones, T.S.; Renner, C. & Aeppli, G. | Molecular Thin Films: A New Type of Magnetic Switch | 2007 |
Advanced Materials Vol. 19 , pp. 3618-3622 |
article | |
Abstract: The design and fabrication of materials that exhibit both semiconducting
and magnetic properties for spintronics and quantum computing has proven difficult. Important starting points are high-purity thin films as well as fundamental theoretical understanding of the magnetism. Here, we show that small molecules have great potential in this area because of ease of insertion of localized spins in organic frameworks and both chemical and structural purity. In particular, we demonstrate that archetypal molecular semiconductors, namely the metal phthalocyanines (Pc), can be readily fabricated as thin film quantum antiferromagnets, important precursors to a solid state quantum computer. Their magnetic state can be switched via fabrication steps that modify the film structure, offering practical routes into information processing. Theoretical calculations show that a new mechanism, which is the molecular analogue of the interactions between magnetic ions in metals, is responsible for the magnetic states. Our combination of theory and experiments opens the field of organic thin film magnetic engineering. |
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BibTeX:
@article{HeuMitWuFisKerStoHarGarTseJonRenAep2007, author = {Heutz, Sandrine and Mitra, Chiranjib and Wu, Wei and Fisher, Andrew J and Kerridge, Andrew and Stoneham, Marshall and Harker, Tony H and Gardener, Julie and Tseng, Hsiang-Han and Jones, Tim S and Renner, Christoph and Aeppli, Gabriel}, title = {Molecular Thin Films: A New Type of Magnetic Switch}, journal = {Advanced Materials}, year = {2007}, volume = {19}, pages = {3618-3622} } |
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HinStoHar1981 | Hintermann, A.; Stoneham, A.M. & Harker, A.H. | Cluster Calculations of Hyperfine Fields and Knight Shifts for Muons in Li and Be | 1981 |
Hyperfine Interactions Vol. 8 (4-6) , pp. 475-478 |
article | |
BibTeX:
@article{HinStoHar1981, author = {Hintermann, A and Stoneham, A M and Harker, A H}, title = {Cluster Calculations of Hyperfine Fields and Knight Shifts for Muons in Li and Be}, journal = {Hyperfine Interactions}, year = {1981}, volume = {8}, number = {4-6}, pages = {475-478} } |
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HinStoHar1983 | Hintermann, A.; Stoneham, A.M. & Harker, A.H. | Spin Polarized Hartree-Fock Calculations for Small Li and Be Clusters with and without a Hydrogen Impurity | 1983 |
Hyperfine Interactions Vol. 15 (1-4) , pp. 537 |
article | |
BibTeX:
@article{HinStoHar1983, author = {Hintermann, A and Stoneham, A M and Harker, A H}, title = {Spin Polarized Hartree-Fock Calculations for Small Li and Be Clusters with and without a Hydrogen Impurity}, journal = {Hyperfine Interactions}, year = {1983}, volume = {15}, number = {1-4}, pages = {537} } |
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HonHarEdi2018 | Hong, X.; Harker, A. & Edirisinghe, M. | Process Modeling for the Fiber Diameter of Polymer, Spun by Pressure-Coupled Infusion Gyration | 2018 |
ACS Omega Vol. 3 (5) , pp. 5470-5479 |
article | |
Abstract: Several new spinning methods have been developed recently to mass produce polymeric fibers. Pressure-coupled infusion gyration is one of them. Because the fiber diameter plays a pivotal role for the mechanical, electrical, and optical properties of the produced fiber mats, in this work, polyethylene oxide is used as a model polymer, and the processing parameters including polymer concentration, infusion (flow) rate, working pressure, and rotational speed are chosen as variables to control fiber diameters spanning the micro- to nanoscale. The experimental process is modeled using response surface methodology, both in linear and nonlinear fitting formats, to allow optimization of processing parameters. The successes of the fitted models are evaluated using adjusted R2 and Akaike information criterion. A systematic description of the experimental process could be obtained according to the model in this study. From the analysis of variance, it is concluded that the polymer concentration of the solution and the working pressure affected the fiber diameters more strongly than other parameters. | ||||||
BibTeX:
@article{HonHarEdi2018, author = {Hong, Xianze and Harker, Anthony and Edirisinghe, Mohan}, title = {Process Modeling for the Fiber Diameter of Polymer, Spun by Pressure-Coupled Infusion Gyration}, journal = {ACS Omega}, year = {2018}, volume = {3}, number = {5}, pages = {5470-5479}, url = { |
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HonHarEdi2019 | Hong, X.; Harker, A. & Edirisinghe, M. | Empirical modelling and optimization of pressure-coupled infusion gyration parameters for the nanofibre fabrication | 2019 |
Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences Vol. 475 (2225) , pp. 20190008 |
article | |
Abstract: Pressure-coupled infusion gyration (PCIG) is a novel promising technique for economical and effective mass production of nanofibres with desirable geometrical characteristics. The average diameter of spun fibres significantly influences the structural, mechanical and physical properties of the produced fibre mats. Having a comprehensive understanding of the significant effects of PCIG experimental variables on the spun fibres is beneficial. In this work, response surface methodology was used to explore the interaction effects and the optimal PCIG experimental variables for achieving the desired morphological characteristics of fibres. The effect of experimental variables, namely solution concentration, infusion (flow) rate, applied pressure and rotational speed, was studied on the average fibre diameter and standard deviations. A numerical model for the interactional influences of experimental variables was developed and optimized with a nonlinear interior point method that can be used as a framework for selecting the optimal conditions to obtain poly-ethylene oxide fibres with desired morphology (targeted average diameter and narrow standard deviation). The adequacy of the models was verified by a set of validation experiments. The results proved that the predicted optimal conditions were able to achieve the average diameter that matched the pre-set desired value with less than 10% of difference. | ||||||
BibTeX:
@article{HonHarEdi2019, author = {Xianze Hong and Anthony Harker and Mohan Edirisinghe}, title = {Empirical modelling and optimization of pressure-coupled infusion gyration parameters for the nanofibre fabrication}, journal = {Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences}, year = {2019}, volume = {475}, number = {2225}, pages = {20190008}, url = {https://royalsocietypublishing.org/doi/abs/10.1098/rspa.2019.0008}, doi = {https://doi.org/10.1098/rspa.2019.0008} } |
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HucSugSofHarMacLoc1996 | Hucknall, P.K.; Sugden, S.; Sofield, C.J.; Harker, A.H.; Mächler, E. & Locquet, J.-P. | Ion scattering for in situ characterization of composition of rm La_2-xSr_xCuO_4 films | 1996 |
Applied Physics Letters Vol. 69 (20) , pp. 3081-3083 |
article | |
Abstract: Ion scattering techniques in the 5-50 keV range have the potential
to yield quantitative information on the composition of high-temperature superconductor (HT_c) films. To demonstrate this we have designed and built an ion scattering spectrometer, compact enough for in situ use, as an analytical tool for vacuum deposition processes. Data collected from rm La_2-xSr_xCuO_4 films demonstrate the excellent mass resolution available using heavy incident ions. Modeling of the data has been carried out using both a simple empirical method and a full Monte Carlo code. In addition to stoichiometric information, the contribution of light recoiled elements to the spectrum is determined. The estimated composition, based in these models is compared with the composition obtained using high energy Rutherford backscattering spectrometry (RBS) to verify the quantitative capabilities of the technique. |
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BibTeX:
@article{HucSugSofHarMacLoc1996, author = {Hucknall, P K and Sugden, S and Sofield, C J and Harker, A H and Mächler, E and Locquet, J-P}, title = {Ion scattering for in situ characterization of composition of rm La_2-xSr_xCuO_4 films}, journal = {Applied Physics Letters}, year = {1996}, volume = {69}, number = {20}, pages = {3081-3083} } |
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ISI:000073438900006 | Bulatov, V.L.; Grimes, R.W. & Harker, A.H. | Low-frequency oscillations in nanoclusters of Lanthanum Trifluoride | 1998 |
Philosphical Magazine Letters Vol. 77 (5) , pp. 267-273 |
article | |
Abstract: We report classical molecular dynamics simulations of clusters of
up to 3120 atoms of lanthanum trifluoride. The results are analysed to show the extent to which such small clusters can also be described by simple continuum methods. The oscillations in the shape of the solid nanoclusters agree very well in frequency and magnitude with those deduced from classical elasticity theory. The liquid-drop oscillations which are seen in the molecular dynamics simulations show that the simulations reproduce the surface tension behaviour of ionic systems. |
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BibTeX:
@article{ISI:000073438900006, author = {Bulatov, V L and Grimes, R W and Harker, A H}, title = {Low-frequency oscillations in nanoclusters of Lanthanum Trifluoride}, journal = {Philosphical Magazine Letters}, year = {1998}, volume = {77}, number = {5}, pages = {267-273} } |
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ISI:A1976BM88000042 | Song, K.S.; Stoneham, A.M. & Harker, A.H. |
Luminescence and Electronic Structure of Self-Trapped Exciton in Alkali Fluorides and Chlorides
[BibTeX] |
1976 |
Journal of Luminescence Vol. 12 (1) , pp. 303-308 |
article | |
BibTeX:
@article{ISI:A1976BM88000042, author = {Song, K S and Stoneham, A M and Harker, A H}, title = {Luminescence and Electronic Structure of Self-Trapped Exciton in Alkali Fluorides and Chlorides}, journal = {Journal of Luminescence}, year = {1976}, volume = {12}, number = {1}, pages = {303-308} } |
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ISI:A1979HQ50900035 | Vail, J.M. & Harker, A.H. |
Theory of rm F_A-Center Optical Absorption in Alkali Halides - Symmetry-Adapted Wave-Functions
[BibTeX] |
1979 |
Physical Review B Vol. 20 (6) , pp. 2506-2511 |
article | |
BibTeX:
@article{ISI:A1979HQ50900035, author = {Vail, J M and Harker, A H}, title = {Theory of rm F_A-Center Optical Absorption in Alkali Halides -- Symmetry-Adapted Wave-Functions}, journal = {Physical Review B}, year = {1979}, volume = {20}, number = {6}, pages = {2506-2511} } |
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ISI:A1980KT78600023 | Itoh, N.; Stoneham, A.M. & Harker, A.H. | Non-Radiative Deexcitation of Highly Excited Self-Trapped Excitons in Alkali Halides - Mechanism of the F-Centre and H-Centre Production | 1980 |
Journal of the Physical Society of Japan Vol. 49 (4) , pp. 1364-1371 |
article | |
BibTeX:
@article{ISI:A1980KT78600023, author = {Itoh, N and Stoneham, A M and Harker, A H}, title = {Non-Radiative Deexcitation of Highly Excited Self-Trapped Excitons in Alkali Halides - Mechanism of the F-Centre and H-Centre Production}, journal = {Journal of the Physical Society of Japan}, year = {1980}, volume = {49}, number = {4}, pages = {1364-1371} } |
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ISI:A1981MP20900033 | Hintermann, A.; Stoneham, A.M. & Harker, A.H. |
Cluster Calculations of Muon Knight-Shift in Be
[BibTeX] |
1981 |
Helvetica Physica Acta Vol. 54 (2) , pp. 248 |
article | |
BibTeX:
@article{ISI:A1981MP20900033, author = {Hintermann, A and Stoneham, A M and Harker, A H}, title = {Cluster Calculations of Muon Knight-Shift in Be}, journal = {Helvetica Physica Acta}, year = {1981}, volume = {54}, number = {2}, pages = {248} } |
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ISI:A1982PQ18100007 | Harker, A.H. |
Computational Methods for the Electronic Structure of Defects in Insulators
[BibTeX] |
1982 |
Lecture Notes in Physics Vol. 166 , pp. 82-93 |
article | |
BibTeX:
@article{ISI:A1982PQ18100007, author = {Harker, A H}, title = {Computational Methods for the Electronic Structure of Defects in Insulators}, journal = {Lecture Notes in Physics}, year = {1982}, volume = {166}, pages = {82-93} } |
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ISI:A1984TD94300341 | Marsh, G.P.; Taylor, K.J. & Harker, A.H. |
Corrosion of Carbon-Steel HLW Containers After Geological Disposal
[BibTeX] |
1984 |
Journal of the Electrochemical Society Vol. 131 (8) , pp. C304 |
article | |
BibTeX:
@article{ISI:A1984TD94300341, author = {Marsh, G P and Taylor, K J and Harker, A H}, title = {Corrosion of Carbon-Steel HLW Containers After Geological Disposal}, journal = {Journal of the Electrochemical Society}, year = {1984}, volume = {131}, number = {8}, pages = {C304} } |
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ISI:A1985ADN2300008 | Harding, J.H. & Harker, A.H. |
Calculations Of Interionic Potentials In Oxides
[BibTeX] |
1985 |
Philosophical Magazine B-Physics of Condensed Matter Statistical Mechanics Electronic Optical and Magnetic Properties Vol. 51 (2) , pp. 119-125 |
article | |
BibTeX:
@article{ISI:A1985ADN2300008, author = {Harding, J H And Harker, A H}, title = {Calculations Of Interionic Potentials In Oxides}, journal = {Philosophical Magazine B-Physics of Condensed Matter Statistical Mechanics Electronic Optical and Magnetic Properties}, year = {1985}, volume = {51}, number = {2}, pages = {119-125} } |
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ISI:A1987G534900004 | Harker, A.H.; Sharland, S.M. & Tasker, P.W. |
A Mathematical Model of Uniform Corrosion of Intermediate Level Radioactive-Waste Canisters in Concrete
[BibTeX] |
1987 |
Radioactive Waste Management and Environmental Restoration Vol. 8 (1) , pp. 65-85 |
article | |
BibTeX:
@article{ISI:A1987G534900004, author = {Harker, A H and Sharland, S M and Tasker, P W}, title = {A Mathematical Model of Uniform Corrosion of Intermediate Level Radioactive-Waste Canisters in Concrete}, journal = {Radioactive Waste Management and Environmental Restoration}, year = {1987}, volume = {8}, number = {1}, pages = {65-85} } |
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ISI:A1989AC56500003 | Itoh, N.; Tanimura, K.; Stoneham, A.M. & Harker, A.H. |
The Lattice Relaxation Energy Associated with Self-Trapping of a Positive Hole and an Exciton In Alkali Halides
[BibTeX] |
1989 |
Journal of Physics: Condensed Matter Vol. 1 (25) , pp. 3911-3918 |
article | |
BibTeX:
@article{ISI:A1989AC56500003, author = {Itoh, N and Tanimura, K and Stoneham, A M and Harker, A H}, title = {The Lattice Relaxation Energy Associated with Self-Trapping of a Positive Hole and an Exciton In Alkali Halides}, journal = {Journal of Physics: Condensed Matter}, year = {1989}, volume = {1}, number = {25}, pages = {3911-3918} } |
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ISI:A1989AH61000021 | Itoh, N.; Stoneham, A.M. & Harker, A.H. | A Theoretical Study of Desorption Induced by Electronic Transitions in Alkali Halides | 1989 |
Surface Science Vol. 217 (3) , pp. 573-589 |
article | |
BibTeX:
@article{ISI:A1989AH61000021, author = {Itoh, N and Stoneham, A M and Harker, A H}, title = {A Theoretical Study of Desorption Induced by Electronic Transitions in Alkali Halides}, journal = {Surface Science}, year = {1989}, volume = {217}, number = {3}, pages = {573-589} } |
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ISI:A1989AR97600009 | Marsh, G.P.; Harker, A.H. & Taylor, K.J. |
Corrosion of Carbon-Steel Nuclear Waste Containers in Marine Sediment
[BibTeX] |
1989 |
Corrosion Vol. 45 (7) , pp. 579-589 |
article | |
BibTeX:
@article{ISI:A1989AR97600009, author = {Marsh, G P and Harker, A H and Taylor, K J}, title = {Corrosion of Carbon-Steel Nuclear Waste Containers in Marine Sediment}, journal = {Corrosion}, year = {1989}, volume = {45}, number = {7}, pages = {579-589} } |
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ISI:A1989U835400012 | Harker, A.H. | Quantum-Mechanical Calculations of Defect Energies | 1989 |
Journal of the Chemical Society-Faraday Transactions II Vol. 85 (Part 5) , pp. 471-483 |
article | |
Abstract: This paper describes the circumstances in which it it necessary to
go beyond a semiclassical model in computing the energies of defects in polar solids. The emphasis will be on the ways in which a small cluster, treated quantum-mechanically, can be provided with an environment which represents both the long- and short-range potential of the surrounding crystal. Attention will be given to the additional level of self-consistency which is required between the cluster and its environment. The paper also reviews the application of quantum-chemical methods in generating parameters for the potentials used in semiclassical models. |
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BibTeX:
@article{ISI:A1989U835400012, author = {Harker, A H}, title = {Quantum-Mechanical Calculations of Defect Energies}, journal = {Journal of the Chemical Society-Faraday Transactions II}, year = {1989}, volume = {85}, number = {Part 5}, pages = {471-483} } |
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ISI:A1990DN05500004 | Jain, U.; Harker, A.H.; Stoneham, A.M. & Williams, D.E. |
Effect of Electrode Geometry on Sensor Response
[BibTeX] |
1990 |
Sensors and Actuators B-Chemical Vol. 2 (2) , pp. 111-114 |
article | |
BibTeX:
@article{ISI:A1990DN05500004, author = {Jain, U and Harker, A H and Stoneham, A M and Williams, D E}, title = {Effect of Electrode Geometry on Sensor Response}, journal = {Sensors and Actuators B-Chemical}, year = {1990}, volume = {2}, number = {2}, pages = {111-114} } |
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ISI:A1991FQ42400002 | Wallace, D.S.; Stoneham, A.M.; Hayes, W.; Fisher, A.J. & Harker, A.H. | Theory of Defects in Conducting Polymers .1. Theoretical Principles and Simple Applications | 1991 |
Journal of Physics: Condensed Matter Vol. 3 (22) , pp. 3879-3903 |
article | |
Abstract: We describe a method for solving simultaneously the Hartree-Fock equations
of motion in the zero differential overlap approximation for the electronic structure of a molecule and the dynamical equations of motion for its atoms. Our approach is similar to that of Car and Parrinello in that we optimize the electronic structure and the geometry simultaneously, but differs in that we make a chosen number of iterations towards electronic self-consistency at each geometry rather than treating the electron wavefunctions as dynamical variables. We give examples of the use of the method to calculate the equilibrium geometries, dipole moments, molecular polarizabilities and vibrational frequencies of small molecules. In the following paper we apply this approach to problems of defect processes in conducting polymers. |
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BibTeX:
@article{ISI:A1991FQ42400002, author = {Wallace, D S and Stoneham, A M and Hayes, W and Fisher, A J and Harker, A H}, title = {Theory of Defects in Conducting Polymers .1. Theoretical Principles and Simple Applications}, journal = {Journal of Physics: Condensed Matter}, year = {1991}, volume = {3}, number = {22}, pages = {3879-3903} } |
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ISI:A1991HP34300006 | Testa, A.; Stoneham, A.M.; Catlow, C.R.A.; Song, K.S.; Harker, A.H. & Harding, J.H. |
The rm V_k Centre in NaCl
[BibTeX] |
1991 |
Radiation Effects and Defects in Solids Vol. 119 (Part 1) , pp. 27-32 |
article | |
BibTeX:
@article{ISI:A1991HP34300006, author = {Testa, A and Stoneham, A M and Catlow, C R A and Song, K S and Harker, A H and Harding, J H}, title = {The rm V_k Centre in NaCl}, journal = {Radiation Effects and Defects in Solids}, year = {1991}, volume = {119}, number = {Part 1}, pages = {27-32} } |
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ISI:A1992JM73900012 | Asthalter, T.; Weyrich, W.; Harker, A.H.; Kunz, A.B.; Orlando, R. & Pisani, C. | Comparison of Quasi-Hartree-Fock wave-functions for Lithium Hydride | 1992 |
Solid State Communications Vol. 83 (9) , pp. 725-730 |
article | |
Abstract: We compare the Hartree-Fock wave-functions for crystalline LiH obtained
either with a standard Crystalline-Orbital-LCAO procedure or following the Adams-Gilbert-Kunz (AGK) prescription. Total energy, band-structure, reciprocal form factors [B(r)] are taken as a reference, for checking the quality of the wave-function. The influence of the inclusion of high angular-quantum-number functions in the AGK basis set is explored. |
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BibTeX:
@article{ISI:A1992JM73900012, author = {Asthalter, T and Weyrich, W and Harker, A H and Kunz, A B and Orlando, R and Pisani, C}, title = {Comparison of Quasi-Hartree-Fock wave-functions for Lithium Hydride}, journal = {Solid State Communications}, year = {1992}, volume = {83}, number = {9}, pages = {725-730} } |
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ISI:A1992JY84400005 | Shluger, A.L.; Harker, A.H.; Grimes, R.W. & Catlow, C.R.A. | Crystal Excitation - Survey of Many-Electron Hartree-Fock Calculations of Self-Trapped Excitons In Insulating Crystals | 1992 |
Philosophical Transactions of the Royal Society A-Mathematical Physical and Engineering Sciences Vol. 341 (1661) , pp. 221-231 |
article | |
Abstract: To model successfully the diversity of electronic structure exhibited
by excitons in alkali halides and in oxide materials, it is necessary to use a variety or combination of theoretical methods. In this review we restrict our discussion to the results of embedded quantum cluster calculations. By considering the results of such studies, it is possible to recognize the general similarities and differences in detail between the various exciton models in these materials. |
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BibTeX:
@article{ISI:A1992JY84400005, author = {Shluger, A L and Harker, A H and Grimes, R W and Catlow, C R A}, title = {Crystal Excitation - Survey of Many-Electron Hartree-Fock Calculations of Self-Trapped Excitons In Insulating Crystals}, journal = {Philosophical Transactions of the Royal Society A-Mathematical Physical and Engineering Sciences}, year = {1992}, volume = {341}, number = {1661}, pages = {221-231}, note = {ICECAP} } |
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ISI:A1993LB70800002 | Wallace, D.; Stoneham, A.M.; Testa, A.; Harker, A.H. & Ramos, M.M.D. | A New Approach to the Quantum Modeling of Biochemicals | 1993 |
Molecular Simulation Vol. 9 (6) , pp. 385-& |
article | |
Abstract: We describe a new approach to the quantum chemistry of biological
molecules and other systems where complex geometry and bonding patterns cause problems. Our approach combines self-consistent quantum chemistry with molecular dynamics, removing the need to define interatomic potentials in advance. The method is illustrated using serotonin (both in free space and with model receptors) as an example. |
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BibTeX:
@article{ISI:A1993LB70800002, author = {Wallace, D and Stoneham, A M and Testa, A and Harker, A H and Ramos, M M D}, title = {A New Approach to the Quantum Modeling of Biochemicals}, journal = {Molecular Simulation}, year = {1993}, volume = {9}, number = {6}, pages = {385-&} } |
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ISI:A1993MP24800009 | Shluger, A.L.; Harker, A.H.; Puchin, V.E.; Itoh, N. & Catlow, C.R.A. | Simulation of Defect Processes - Experiences With the Self-Trapped Exciton | 1993 |
Modelling and Simulation in Materials Science and Engineering Vol. 1 (5) , pp. 673-692 |
article | |
Abstract: We present a critical analysis of the applicability of cluster ab
initio many-electron methods to studies of the structure and spectroscopic properties of defects in insulating crystals on the basis of comparison of the results of recent calculations with experimental data for self-trapped excitons. These are archetypal intrinsic defects and the calculation of their properties illustrates almost all the characteristic features of defect studies, including the study of the atomic and electronic structure, diffusion and spectroscopic parameters. |
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BibTeX:
@article{ISI:A1993MP24800009, author = {Shluger, A L and Harker, A H and Puchin, V E and Itoh, N and Catlow, C R A}, title = {Simulation of Defect Processes - Experiences With the Self-Trapped Exciton}, journal = {Modelling and Simulation in Materials Science and Engineering}, year = {1993}, volume = {1}, number = {5}, pages = {673-692}, note = {ICECAP} } |
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ISI:A1994PN21400012 | Harker, A.H. & Harding, J.H. | Interionic Potentials for Oxides - Theory and Applications | 1994 |
Radiation Effects and Defects in Solids Vol. 129 (1-2) , pp. 77-80 |
article | |
BibTeX:
@article{ISI:A1994PN21400012, author = {Harker, A H And Harding, J H}, title = {Interionic Potentials for Oxides - Theory and Applications}, journal = {Radiation Effects and Defects in Solids}, year = {1994}, volume = {129}, number = {1-2}, pages = {77-80} } |
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ISI:A1994QA81300016 | Gosling, T.J.; Jain, S.C. & Harker, A.H. | The Kinetics of Strain Relaxation in Lattice-Mismatched Semiconductor Layers | 1994 |
Physica Status Solidi A-Applied Research Vol. 146 (2) , pp. 713-734 |
article | |
Abstract: A scheme is proposed within which the elements of dislocation propagation,
interaction, nucleation, and multiplication may be combined to yield a model of strain relaxation in lattice-mismatched semiconductor layers. interaction between perpendicular dislocations is considered more fully than previously, and criteria that determine whether a propagating threading dislocation will be blocked because of such an interaction are incorporated into the kinetic model. These criteria are developed in detail using the full half-space stresses of a dislocation, and then an approximation is presented that allows the results yielded by these criteria to be reproduced almost exactly, using formulae of great simplicity. Theoretical consideration of the nucleation and multiplication processes is found to be more difficult, but elementary treatments are presented that allow the kinetic model to be tested against experiment with reasonable results. Various problems inherent in the modelling of strain relaxation are highlighted and discussed. |
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BibTeX:
@article{ISI:A1994QA81300016, author = {Gosling, T J and Jain, S C and Harker, A H}, title = {The Kinetics of Strain Relaxation in Lattice-Mismatched Semiconductor Layers}, journal = {Physica Status Solidi A--Applied Research}, year = {1994}, volume = {146}, number = {2}, pages = {713-734} } |
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ISI:A1995QT96500008 | Harker, A.H.; Pinardi, K.; Jain, S.C.; Atkinson, A. & Bullough, R. | 2-Dimensional Finite-Element Calculation of Stress and Strain in a Stripe Epilayer and Substrate | 1995 |
Philosophical Magazine A-Physics of Condensed Matter Structure Defects and Mechanical Properties Vol. 71 (4) , pp. 871-881 |
article | |
Abstract: We report the first finite-element calculations of stress and strain
in a layer, and the substrate on which it is grown, without any of the approximations used in earlier calculations. We take into account strain relaxation due to the finite (not `zero') thickness h of the stripe layer, the effect of its narrow width 2l and stresses created in the substrate because of the film edges. The coupling of the two relaxations (in the film and substrate) is found to have a large effect on the magnitudes of stress and strain. The previous calculations either neglect distortion of the substrate and/or assume a negligible thickness of the layer, so that there is no variation in stress in the layer as a function of distance from the interface. The results reported in this paper reveal the deficiencies of the earlier models. They show, for the first time, that the lattice planes of the layer and of the substrate near the interface are curved even though the substrate has `infinite' dimensions. They also show that, for a layer with h/l = 1 or greater, the stress in the top layer changes sign; that is if the layer in the centre near the interface is under compression, the top of the layer is under tensile stress. Results of the finite-element calculations are compared with analytical models and relevant available experimental data. Analytical models are found to be inaccurate. Agreement with the experimental data is satisfactory. |
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BibTeX:
@article{ISI:A1995QT96500008, author = {Harker, A H and Pinardi, K and Jain, S C and Atkinson, A and Bullough, R}, title = {2-Dimensional Finite-Element Calculation of Stress and Strain in a Stripe Epilayer and Substrate}, journal = {Philosophical Magazine A-Physics of Condensed Matter Structure Defects and Mechanical Properties}, year = {1995}, volume = {71}, number = {4}, pages = {871-881} } |
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ISI:A1995RC30300012 | Atkinson, A.; Jain, S.C. & Harker, A.H. |
Strain, dislocations, and critical dimensions of laterally small lattice-mismatched semiconductor layers
[BibTeX] |
1995 |
Journal of Applied Physics Vol. 77 (5) , pp. 1907-1913 |
article | |
BibTeX:
@article{ISI:A1995RC30300012, author = {Atkinson, A and Jain, S C and Harker, A H}, title = {Strain, dislocations, and critical dimensions of laterally small lattice-mismatched semiconductor layers}, journal = {Journal of Applied Physics}, year = {1995}, volume = {77}, number = {5}, pages = {1907-1913} } |
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ISI:A1995RK57600036 | Jain, S.C.; Harker, A.H.; Atkinson, A. & Pinardi, K. | Edge-Induced Stress and Strain in Stripe Films and Substrates - A 2-Dimensional Finite-Element Calculation | 1995 |
Journal of Applied Physics Vol. 78 (3) , pp. 1630-1637 |
article | |
Abstract: Finite element calculations of stresses and strains in substrates
and stripe films of thickness h and width 2l are reported. Both variation of the stress in the vertical direction (away from the interface) in the film and distortion of the substrate are taken into account. The calculations show that both the horizontal and vertical lattice planes are curved in the film as well as in the substrate. If the thickness of the substrate is infinite, the curvature in the substrate is maximum near the interface and decays rapidly with depth. Furthermore, the edges near the top are over-relaxed, i.e., if the film is originally under compression, the stress becomes tensile because the free edge surfaces affect the relaxation. For a film with h/l=1 or greater, the stress is reversed throughout the top layer. The change from compression to tension takes place partly because of the Poisson effect and partly due to the bending of the lattice planes. The approximations made in the existing analytical models were examined and the conditions under which the models describe the stresses in the film or in the substrate were determined to a good approximation. Our finite element calculations agree with the available experimental data. Ours are the only theoretical results with which measured substrate stresses agree qualitatively. (C) 1995 American Institute of Physics. |
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BibTeX:
@article{ISI:A1995RK57600036, author = {Jain, S C and Harker, A H and Atkinson, A and Pinardi, K}, title = {Edge-Induced Stress and Strain in Stripe Films and Substrates - A 2-Dimensional Finite-Element Calculation}, journal = {Journal of Applied Physics}, year = {1995}, volume = {78}, number = {3}, pages = {1630-1637} } |
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ISI:A1995TG04100004 | Torres, V.J.B.; Stoneham, A.M.; Sofield, C.J.; Harker, A.H. & Clement, C.F. | Early Stages of Silicon Oxidation | 1995 |
Interface Science Vol. 3 (2) , pp. 133-141 |
article | |
Abstract: Experiments have shown that the early stages of silicon oxidation
proceed layer by layer, so that one layer is essentially complete before another develops. Other experiments show that the mechanism does not involve step growth, the most obvious mechanism. We use a new approach to modelling the growth to show that these two observations can be understood when there is a rate-determining step which depends strongly on the local oxide thickness. The rate in question might be the sticking probability, or the rate of incorporation of adsorbed oxygen species into the oxide network. Such mechanisms are possible when transport by an ionic species dominates, contrary to the situation for thicker films. Our modelling suggests the mechanisms are driven by the image interaction, as in earlier suggestions by Stoneham and Tasker, rather than an effect of the electric field central to the Mott-Cabrera mechanism. |
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BibTeX:
@article{ISI:A1995TG04100004, author = {Torres, V J B and Stoneham, A M and Sofield, C J and Harker, A H and Clement, C F}, title = {Early Stages of Silicon Oxidation}, journal = {Interface Science}, year = {1995}, volume = {3}, number = {2}, pages = {133-141} } |
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ISI:A1996TU11900001 | Grimes, R.W.; Harker, A.H. & Lidiard, A.B. |
Interatomic potentials
[BibTeX] |
1996 |
Philosophical Magazine B-Physics of Condensed Matter Statistical Mechanics Electronic Optical and Magnetic Properties Vol. 73 (1) , pp. 1 |
article | |
BibTeX:
@article{ISI:A1996TU11900001, author = {Grimes, R W and Harker, A H and Lidiard, AB}, title = {Interatomic potentials}, journal = {Philosophical Magazine B-Physics of Condensed Matter Statistical Mechanics Electronic Optical and Magnetic Properties}, year = {1996}, volume = {73}, number = {1}, pages = {1} } |
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ISI:A1996UN20700064 | Dietrich, B.; Bugiel, E.; Frankenfeldt, H.; Harker, A.H.; Jagdhold, U.; Tillack, B. & Wolff, A. | Strain measurement in thin pseudomorphic SiGe layers of submicron wires using Raman spectroscopy | 1996 |
Solid-State Electronics Vol. 40 (1-8, Sp. Iss. SI) , pp. 307-310 |
article | |
Abstract: The internal strain in thin heteroepitaxial Si1-xGex layers was investigated
before and after etching the material between the remaining narrow stripes. The strong inner stress in pseudomorphic heterostructures, caused by the difference in the lattice constants of Si and Si1-xGex, relaxes in small regions after removing the surrounding layer material which mediates the stress. Strain and relaxation were determined from micro-Raman measurements. These measurements were compared with calculations using a two-dimensional finite element program to predict the strain distributions in Si1-xGex layers. Assuming a pure elastic relaxation of the pseudomorphic strain we have found a reasonably good agreement between the measured and calculated Raman shifts. |
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BibTeX:
@article{ISI:A1996UN20700064, author = {Dietrich, B and Bugiel, E and Frankenfeldt, H and Harker, A H and Jagdhold, U and Tillack, B and Wolff, A}, title = {Strain measurement in thin pseudomorphic SiGe layers of submicron wires using Raman spectroscopy}, journal = {Solid-State Electronics}, year = {1996}, volume = {40}, number = {1-8, Sp. Iss. SI}, pages = {307-310}, note = {7th International Conference on Modulated Semiconductor Structures (MSS-7), Madrid, Spain, July 10-14, 1995} } |
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ISI:A1996UQ25600017 | Atkinson, A.; Johnson, T.; Harker, A.H. & Jain, S.C. | Film edge-induced stress in substrates and finite film | 1996 |
Thin Solid Films Vol. 274 (1-2) , pp. 106-112 |
article | |
BibTeX:
@article{ISI:A1996UQ25600017, author = {Atkinson, A and Johnson, T and Harker, A H and Jain, S C}, title = {Film edge-induced stress in substrates and finite film}, journal = {Thin Solid Films}, year = {1996}, volume = {274}, number = {1-2}, pages = {106-112} } |
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ISI:A1996VX71800040 | Godwin, P.D.; Horsfield, A.P.; Stoneham, A.M.; Bull, S.J.; Ford, I.J.; Harker, A.H.; Pettifor, D.G. & Sutton, A.P. | Computational materials synthesis .3. Synthesis of hydrogenated amorphous carbon from molecular precursors | 1996 |
Physical Review B Vol. 54 (22) , pp. 15785-15794 |
article | |
Abstract: A simple tight-binding model is used to simulate the synthesis of
a range of hydrogenated amorphous carbons having differing compositions and formed under differing processing conditions from benzene and ethene molecular precursors. The resultant structures are analyzed and we find both olefinic and delocalized pi-bonding systems. In the more dense structures we find highly defected graphitic inclusions crosslinked by fourfold coordinated carbon atoms. In the less dense structures we find chains, weakly attached rings, and large voids. There are both similarities and differences in the structures from different molecular precursors. |
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BibTeX:
@article{ISI:A1996VX71800040, author = {Godwin, P D and Horsfield, A P and Stoneham, A M and Bull, S J and Ford, I J and Harker, A H and Pettifor, D G and Sutton, A P}, title = {Computational materials synthesis .3. Synthesis of hydrogenated amorphous carbon from molecular precursors}, journal = {Physical Review B}, year = {1996}, volume = {54}, number = {22}, pages = {15785-15794} } |
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ItoStoHar1977 | Itoh, N.; Stoneham, A.M. & Harker, A.H. | The initial protection of defects in alkali halides: F and H centre production by non-radiative decay of the self-trapped exciton | 1977 |
Journal of Physics C: Solid State Physics Vol. 10 (21) , pp. 4197 |
article | |
Abstract: Radiation damage in KCl can be produced by the decay of a self-trapped
exciton into an F centre and an H centre. The authors present calculations of the energies of the states involved for various stages in the evolution of the damage. These lead to important conclusions about the very rapid damage process, and support strongly Itoh and Saidoh's suggestion (1973) that damage proceeds through an excited hole state. The results also help in understanding the prompt decay of F and H pairs at low temperatures, the thermal annihilation of F and H centres, the effects of optical excitation of the self-trapped exciton, and some of the trends within the alkali halides. The calculations use a self-consistent semi-empirical molecular-orbital method. A large cluster of ions is used (either 42 or 57 ions) plus long-range Madelung terms. The ion positions were obtained from separate lattice-relaxation calculations with the HADES code. The choice of CNDO parameters and the adequacy of the method were checked by a number of separate predictions. |
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BibTeX:
@article{ItoStoHar1977, author = {Itoh, N and Stoneham, A M and Harker, A H}, title = {The initial protection of defects in alkali halides: F and H centre production by non-radiative decay of the self-trapped exciton}, journal = {Journal of Physics C: Solid State Physics}, year = {1977}, volume = {10}, number = {21}, pages = {4197}, url = {http://stacks.iop.org/0022-3719/10/i=21/a=010} } |
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JaiDieRicAtkHar1995 | Jain, S.C.; Dietrich, B.; Richter, H.; Atkinson, A. & Harker, A.H. | Stresses in strained GeSi stripes: Calculation and determination from Raman measurements | 1995 |
Physical Review B Vol. 52 (6) , pp. 6247 - 6253 |
article | |
Abstract: Three mechanisms by which edges induce stress relaxation in GeSi strained
stripes are described and their relative importance is discussed. Relaxation of stresses in the middle of the layers with l/h(=half-width/thickness) varying from 3 to 100 is calculated including the effect of the two mechanisms which are important in this range. The values calculated in this manner agree with our recent finite element calculations. Since the stresses in the stripes in the two orthogonal directions are not equal and since the stripes are usually grown in the [110] direction on a (100) substrate, determination of stress and strain using Raman measurements is not straightforward. A relation between the shifts Δ3 in the LO Raman frequency and stresses and strains in the stripe is established. With the help of this relation, a single measurement of ??3 is sufficient to determine all the stresses and strains in the middle of the top layer of the stripe. Using recently measured values of Δ3 and known values of phonon deformation potentials, stresses inrm Ge_0.14Si_0.86 stripes are determined. The values determined in this manner agree with the calculated values within the uncertainty in the available values of deformation potentials. The method developed is general and can be used for other semiconductor stripes irrespective of whether the strain is thermal or due to lattice mismatch. |
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BibTeX:
@article{JaiDieRicAtkHar1995, author = {Jain, S C and Dietrich, B and Richter, H and Atkinson, A and Harker, A H}, title = {Stresses in strained GeSi stripes: Calculation and determination from Raman measurements}, journal = {Physical Review B}, year = {1995}, volume = {52}, number = {6}, pages = {6247 - 6253} } |
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JaiHarCow1997 | Jain, S.C.; Harker, A.H. & Cowley, R.A. | Misfit strain and misfit dislocations in lattice mismatched epitaxial layers and other systems | 1997 |
Philosophical Magazine A-Physics of Condensed Matter Structure Defects and Mechanical Properties Vol. 75 (6) , pp. 1461-1515 |
article | |
Abstract: Heterostructures in the form of thin layers of one material grown
on a substrate have been the subject of intense study for several years. In the case of semiconductor systems the aim is to grow epitaxial layers of, for example, Si1-xGex on Si, and devices based on such structures are already in use. Much is known, as is summarized in this review, about the stability of such systems against the insertion of dislocations, and about the critical thicknesses up to which strained layer structures are stable. The effects of dislocation nucleation and the dynamics of dislocation motion which lead to strain relaxation in metastable systems are also reviewed. The present state of theoretical understanding is compared with what is known experimentally. For metallic systems, which often exhibit magnetic properties, the underlying problems of lattice mismatch and strain relief are similar, but much of the interest has been concentrated on the commensurate-incommensurate transition in both structurally and magnetically modulated materials. The theory of this transition is reviewed, both for metallic systems and for epitaxial layers on graphite. In bringing together these different classes of systems within one review, it has been possible to demonstrate the parallels between them. It is hoped that, as a result, transfers of ideas between the fields will be promoted. |
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BibTeX:
@article{JaiHarCow1997, author = {Jain, S C and Harker, A H and Cowley, R A}, title = {Misfit strain and misfit dislocations in lattice mismatched epitaxial layers and other systems}, journal = {Philosophical Magazine A-Physics of Condensed Matter Structure Defects and Mechanical Properties}, year = {1997}, volume = {75}, number = {6}, pages = {1461-1515} } |
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JaiJaiHarBul1995 | Jain, U.; Jain, S.C.; Harker, A.H. & Bullough, R. | Nucleation of Dislocation Loops in Strained Epitaxial Layers | 1995 |
Journal of Applied Physics Vol. 77 (1) , pp. 103-109 |
article | |
Abstract: The combined effect of the misfit strain and the strain caused by
a neighboring defect on the activation energy of nucleation of dislocation loops is calculated. Defects of different sizes and shapes and located at different distances from the loop are considered. At very low mismatches (<0.5%) and with very small defects, the activation energy is not sufficiently reduced and large layer thicknesses are required for nucleation. At mismatches of 1% or more, and with defect sizes of 1.5 nm or larger, heterogeneous nucleation at growth temperatures becomes possible. These defects are more efficient in reducing the energy when they are at the center of the loop. Though impurities located within the core of the dislocations can reduce the core parameter substantially and therefore reduce the activation energy, in practice this is unlikely to occur. Very large defects such as SiO2 and SiC precipitates reduce the activation energy of nucleation over large distances thereby inducing the nucleation of several loops which results in very rapid relaxation of strain. In highly mismatched layers (48 homogeneous nucleation occurs at about 400?500? C. Why the periodic arrangement of misfit dislocations is observed only in the highly mismatched layers is explained. |
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BibTeX:
@article{JaiJaiHarBul1995, author = {Jain, U and Jain, S C and Harker, A H and Bullough, R}, title = {Nucleation of Dislocation Loops in Strained Epitaxial Layers}, journal = {Journal of Applied Physics}, year = {1995}, volume = {77}, number = {1}, pages = {103-109} } |
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KerHarSto2004 | Kerridge, A.; Harker, A.H. & Stoneham, A.M. | Quantum behaviour of hydrogen and muonium in vacancy-containing complexes in diamond | 2004 |
Journal of Physics: Condensed Matter Vol. 16 (47) , pp. 8743-8751 |
article | |
BibTeX:
@article{KerHarSto2004, author = {Kerridge, A and Harker, A H and Stoneham, A M}, title = {Quantum behaviour of hydrogen and muonium in vacancy-containing complexes in diamond}, journal = {Journal of Physics: Condensed Matter}, year = {2004}, volume = {16}, number = {47}, pages = {8743-8751}, note = {AHH} } |
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KerHarSto2007 | Kerridge, A.; Harker, A.H. & Stoneham, A.M. | Electron dynamics in quantum gate operation | 2007 |
Journal of Physics: Condensed Matter Vol. 19 , pp. 282201 |
article | |
BibTeX:
@article{KerHarSto2007, author = {Kerridge, A and Harker, A H and Stoneham, A M}, title = {Electron dynamics in quantum gate operation}, journal = {Journal of Physics: Condensed Matter}, year = {2007}, volume = {19}, pages = {282201}, note = {AHH} } |
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KerSavHarSto2006 | Kerridge, A.; Savory, S.; Harker, A.H. & Stoneham, A.M. | Time dependent quantum simulations of two-qubit gates based on donor states in silicon | 2006 |
Journal of Physics Condensed Matter Vol. 18 (21) , pp. S767-776 |
article | |
Abstract: Many quantum gate proposals make physical assumptions to ease analysis.
Here we explicitly consider the effect of these assumptions for a particular two-qubit gate proposal, a cube-root-of-unity gate, in which the two qubits are donors in a semiconductor coupled via an intermediate 'control' spin. Our approach considers directly the electronic structures of the qubit and control impurity systems. We find that such gates are highly sensitive to environmental factors overlooked in analytically soluble models, but that there are regimes in which simplifying assumptions are valid and lead to high fidelity gates. |
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BibTeX:
@article{KerSavHarSto2006, author = {Kerridge, A and Savory, S and Harker, A H and Stoneham, A M}, title = {Time dependent quantum simulations of two-qubit gates based on donor states in silicon}, journal = {Journal of Physics Condensed Matter}, year = {2006}, volume = {18}, number = {21}, pages = {S767-776}, note = {AHH} } |
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KotHarVenEdi2018 | Kothandaraman, A.; Harker, A.; Ventikos, Y. & Edirisinghe, M. | Novel Preparation of Monodisperse Microbubbles by Integrating Oscillating Electric Fields with Microfluidics | 2018 |
Micromachines Vol. 9 (10) , pp. 497 |
article | |
Abstract: Microbubbles generated by microfluidic techniques have gained substantial interest in various industries such as cosmetics, food engineering, and the biomedical field. The microfluidic T-junction provides exquisite control over processing parameters, however, it relies on pressure driven flows only; therefore, bubble size variation is limited especially for viscous solutions. A novel set-up to superimpose an alternating current (AC) oscillation onto a direct current (DC) field is invented in this work, capitalising on the possibility to excite bubble resonance phenomenon and properties, and introducing relevant parameters such as frequency, AC voltage, and waveform to further control bubble size. A capillary embedded T-junction microfluidic device fitted with a stainless-steel capillary was utilised for microbubble formation. Furthermore, a numerical model of the T-junction was developed by integrating the volume of fluid (VOF) method with the electric module; simulation results were attained for the formation of the microbubbles with a particular focus on the flow fields along the detachment of the emerging bubble. Two main types of experiments were conducted in this framework: the first was to test the effect of applied AC voltage magnitude and the second was to vary the applied frequency. Experimental results indicated that higher frequencies have a pronounced effect on the bubble diameter within the 100 Hz and 2.2 kHz range, whereas elevated AC voltages tend to promote bubble elongation and growth. Computational results suggest there is a uniform velocity field distribution along the bubble upon application of a superimposed field and that microbubble detachment is facilitated by the recirculation of the dispersed phase. Furthermore, an ideal range of parameters exists to tailor monodisperse bubble size for specific applications. | ||||||
BibTeX:
@article{KotHarVenEdi2018, author = {Kothandaraman, Anjana and Harker, Anthony and Ventikos, Yiannis and Edirisinghe, Mohan}, title = {Novel Preparation of Monodisperse Microbubbles by Integrating Oscillating Electric Fields with Microfluidics}, journal = {Micromachines}, year = {2018}, volume = {9}, number = {10}, pages = {497}, url = {http://www.mdpi.com/2072-666X/9/10/497}, doi = {https://doi.org/10.3390/mi9100497} } |
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LefHar1976 | Lefrant, S. & Harker, A.H. | Theoretical Study Of F Centres In BaClF and SrClF | 1976 |
Solid State Communications Vol. 19 (9) , pp. 853-856 |
article | |
BibTeX:
@article{LefHar1976, author = {Lefrant, S and Harker, A H}, title = {Theoretical Study Of F Centres In BaClF and SrClF}, journal = {Solid State Communications}, year = {1976}, volume = {19}, number = {9}, pages = {853-856} } |
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LefHarTau1975 | Lefrant, S.; Harker, A.H. & Taurel, L. | F and perturbed F(F*) centres in strontium chloride | 1975 |
Journal of Physics C: Solid State Physics Vol. 8 (8) , pp. 1119 |
article | |
Abstract: Point-ion and ion-size calculations on F centres and F* centres (F
centres perturbed by an alkaline impurity) in SrCl 2 are described. The point-ion calculation for the F centre gives a transition energy of 2.11 eV (experiment 2.13 eV) and a hyperfine interaction with the hearest 35 Cl nuclei of 45.7 MHz (experiment 23.8 MHz). Ion-size calculations lead to an improved value for the hyperfine interaction. A model of the F* centre with an interstitial alkali ion in a second-neighbour position and associated distortions explains the observed optical absorption spectra. |
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BibTeX:
@article{LefHarTau1975, author = {Lefrant, S and Harker, A H and Taurel, L}, title = {F and perturbed F(F*) centres in strontium chloride}, journal = {Journal of Physics C: Solid State Physics}, year = {1975}, volume = {8}, number = {8}, pages = {1119}, url = {http://stacks.iop.org/0022-3719/8/i=8/a=015} } |
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LefYusHouHar1976 | Lefrant, S.; Yuste, M.; Houlier, B. & Harker, A.H. | Study of F centres in quadratic and orthorhombic crystals | 1976 |
Journal de Physique Vol. 12 (Suppl) , pp. C7-232 |
article | |
BibTeX:
@article{LefYusHouHar1976, author = {Lefrant, S and Yuste, M and Houlier, B and Harker, A H}, title = {Study of F centres in quadratic and orthorhombic crystals}, journal = {Journal de Physique}, year = {1976}, volume = {12}, number = {Suppl}, pages = {C7-232} } |
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MakHarKwoEdiRosMurEzr2016 | Mak, F.H.W.; Harker, A.; Kwon, K.-A.; Edirisinghe, M.; Rose, G.E.; Murta, F. & Ezra, D.G. | Analysis of blink dynamics in patients with blepharoptosis | 2016 |
Journal of The Royal Society Interface Vol. 13 (116) |
article | harker |
Abstract: Owing to the rapid movements of the human upper eyelid, a high-speed
camera was used to record and characterize voluntary blinking and the blink dynamics of blepharoptosis patients were compared to a control group. Twenty-six blepharoptosis patients prior to surgery and 45 control subjects were studied and the vertical height of the palpebral aperture (PA) was measured manually at 2 ms intervals during each blink cycle. The PA and blinking speed were plotted with respect to time and a predictive model was generated. The blink dynamic was analysed in closing and opening phases, and revealed a reduced speed of the initial opening phase in ptotic patients, suggesting intrinsic muscle function change in ptosis pathogenesis. The PA versus time curve for each subject was reconstructed using custom-built parameters; however, there were significant differences between the two groups. Those parameters used included the rate of closure, the delay between opening and closing, rate of initial opening, rate of slow opening (nonlinear function) and the `switch point' between those two rates of opening. The model was tested against a new group of subjects and was able to discriminate ptosis patients from controls with 80% accuracy. |
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BibTeX:
@article{MakHarKwoEdiRosMurEzr2016, author = {Mak, Felix H W and Harker, Anthony and Kwon, Kyung-Ah and Edirisinghe, Mohan and Rose, Geoffrey E and Murta, Fabiola and Ezra, Daniel G}, title = {Analysis of blink dynamics in patients with blepharoptosis}, journal = {Journal of The Royal Society Interface}, publisher = {The Royal Society}, year = {2016}, volume = {13}, number = {116}, url = {http://rsif.royalsocietypublishing.org/content/13/116/20150932}, doi = {https://doi.org/10.1098/rsif.2015.0932} } |
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MarBalHar1986a | Martin, T.P.; Balint-Kurti, G.G. & Harker, A.H. | Valence-Electron-Only Molecular-Orbital Calculations of the Energies of Impurities in Metals | 1986 |
Journal of Physics C: Solid State Physics Vol. 19 (25) , pp. 4917-4933 |
article | |
BibTeX:
@article{MarBalHar1986a, author = {Martin, T P and Balint-Kurti, G G and Harker, A H}, title = {Valence-Electron-Only Molecular-Orbital Calculations of the Energies of Impurities in Metals}, journal = {Journal of Physics C: Solid State Physics}, year = {1986}, volume = {19}, number = {25}, pages = {4917-4933} } |
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MarBalHar1986b | Martin, T.P.; Balint-Kurti, G.G. & Harker, A.H. | Valence-Electron-Only Molecular-Orbital Calculations of Knight Shifts of Muons in Metals | 1986 |
Journal of Physics C: Solid State Physics Vol. 19 (25) , pp. 4935-4951 |
article | |
BibTeX:
@article{MarBalHar1986b, author = {Martin, T P and Balint-Kurti, G G and Harker, A H}, title = {Valence-Electron-Only Molecular-Orbital Calculations of Knight Shifts of Muons in Metals}, journal = {Journal of Physics C: Solid State Physics}, year = {1986}, volume = {19}, number = {25}, pages = {4935-4951} } |
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MasHarSto1983 | Masri, P.; Harker, A.H. & Stoneham, A.M. | Nature and diffusion of the self-interstitial in silicon | 1983 |
Journal of Physics C: Solid State Physics Vol. 16 (18) , pp. L613 |
article | |
Abstract: The authors exploit self-consistent, semi-empirical molecular orbital
calculations (CNDO) for large silicon clusters to characterise self-interstitials. Hexagonal (I + ) and split (100) forms (I - and probably I 0 ) are favoured among the several forms investigated. Possible extended high-temperature forms are not discussed. The results imply Bourgoin-Corbett (1972) athermal diffusion in p-Si and low-activation energy classical motion in n-Si; local excitation enhanced motion is possible, though not verified, but local heating is unlikely. Results agree well with experiment, both for Si and in understanding the different behaviour of silicon and diamond. The energetic advantage of the split form predicted is also supported by the observed split impurity interstitials and unidentified defects, related to the self-interstitial, observed in structures similar to the split (100) form. |
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BibTeX:
@article{MasHarSto1983, author = {Masri, P and Harker, A H and Stoneham, A M}, title = {Nature and diffusion of the self-interstitial in silicon}, journal = {Journal of Physics C: Solid State Physics}, year = {1983}, volume = {16}, number = {18}, pages = {L613}, url = {http://stacks.iop.org/0022-3719/16/i=18/a=003} } |
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OngHarSto1993 | Ong, C.K.; Harker, A.H. & Stoneham, A.M. | Environment of the rm P_b centre at the Si (111)/oxide interface | 1993 |
Interface Science Vol. 1 (2) , pp. 139-146 |
article | |
BibTeX:
@article{OngHarSto1993, author = {Ong, C K and Harker, A H and Stoneham, A M}, title = {Environment of the rm P_b centre at the Si (111)/oxide interface}, journal = {Interface Science}, year = {1993}, volume = {1}, number = {2}, pages = {139-146} } |
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OsmBaiHarFasHooFor2012 | Osmanovic, D.; Bailey, J.; Harker, A.H.; Fassati, A.; Hoogenboom, B.W. & Ford, I.J. | Bistable collective behavior of polymers tethered in a nanopore | 2012 |
Phys. Rev. E Vol. 85 , pp. 061917 |
article | |
Abstract: Polymer-coated pores play a crucial role in nucleo-cytoplasmic transport
and in a number of biomimetic and nanotechnological applications. Here we present Monte Carlo and Density Functional Theory approaches to identify different collective phases of end-grafted polymers in a nanopore and to study their relative stability as a function of intermolecular interactions. Over a range of system parameters that is relevant for nuclear pore complexes, we observe two distinct phases: one with the bulk of the polymers condensed at the wall of the pore, and the other with the polymers condensed along its central axis. The relative stability of these two phases depends on the interpolymer interactions. The existence the two phases suggests a mechanism in which marginal changes in these interactions, possibly induced by nuclear transport receptors, cause the pore to transform between open and closed configurations, which will influence transport through the pore. |
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BibTeX:
@article{OsmBaiHarFasHooFor2012, author = {Osmanovic, Dino and Bailey, Joe and Harker, Anthony H and Fassati, Ariberto and Hoogenboom, Bart W and Ford, Ian J}, title = {Bistable collective behavior of polymers tethered in a nanopore}, journal = {Phys. Rev. E}, publisher = {American Physical Society}, year = {2012}, volume = {85}, pages = {061917}, url = {http://link.aps.org/doi/10.1103/PhysRevE.85.061917}, doi = {https://doi.org/10.1103/PhysRevE.85.061917} } |
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ParReaKnoBroStrPedHarEdi2016 | Parhizkar, M.; Reardon, P.J.T.; Knowles, J.C.; Browning, R.J.; Stride, E.; Pedley, B.R.; Harker, A.H. & Edirisinghe, M. | Electrohydrodynamic encapsulation of cisplatin in poly (lactic-co-glycolic acid) nanoparticles for controlled drug delivery | 2016 |
Nanomedicine: Nanotechnology, Biology and Medicine Vol. 12 (7) , pp. 1919-1929 |
article | |
Abstract: Targeted delivery of potent, toxic chemotherapy drugs, such as cisplatin,
is a significant area of research in cancer treatment. In this study, cisplatin was successfully encapsulated with high efficiency (>70 in poly (lactic-co-glycolic acid) polymeric nanoparticles by using electrohydrodynamic atomization (EHDA) where applied voltage and solution flow rate as well as the concentration of cisplatin and polymer were varied to control the size of the particles. Thus, nanoparticles were produced with three different drug:polymer ratios (2.5, 5 and 10wt% cisplatin). It was shown that smaller nanoparticles were produced with 10wt% cisplatin. Furthermore, these demonstrated the best sustained release (smallest burst release). By fitting the experimental data with various kinetic models it was concluded that the release is dependent upon the particle morphology and the drug concentration. Thus, these particles have significant potential for cisplatin delivery with controlled dosage and release period that are crucial chemotherapy parameters. |
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BibTeX:
@article{ParReaKnoBroStrPedHarEdi2016, author = {Parhizkar, Maryam and Reardon, Philip J T and Knowles, Jonathan C and Browning, Richard J and Stride, Eleanor and Pedley, Barbara R and Harker, Anthony H and Edirisinghe, Mohan}, title = {Electrohydrodynamic encapsulation of cisplatin in poly (lactic-co-glycolic acid) nanoparticles for controlled drug delivery}, journal = {Nanomedicine: Nanotechnology, Biology and Medicine}, year = {2016}, volume = {12}, number = {7}, pages = {1919-1929}, url = {http://dx.doi.org/10.1016/j.nano.2016.05.005}, doi = {https://doi.org/10.1016/j.nano.2016.05.005} } |
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ReaParHarBroVasStrPedEdiKno2017 | Reardon, P.J.T.; Parhizkar, M.; Harker, A.H.; Browning, R.J.; Vassileva, V.; Stride, E.; Pedley, R.B.; Edirisinghe, M. & Knowles, J.C. | Electrohydrodynamic fabrication of core-shell PLGA nanoparticles with controlled release of cisplatin for enhanced cancer treatment | 2017 |
International Journal of Nanomedicine Vol. 12 , pp. 3913-3926 |
article | |
Abstract: Increasing the clinical efficacy of toxic chemotherapy drugs such as cisplatin (CDDP), via targeted drug delivery, is a key area of research in cancer treatment. In this study, CDDP-loaded poly(lactic-co-glycolic acid) (PLGA) polymeric nanoparticles (NPs) were successfully prepared using electrohydrodynamic atomization (EHDA). The configuration was varied to control the distribution of CDDP within the particles, and high encapsulation efficiency (>70%) of the drug was achieved. NPs were produced with either a core-shell (CS) or a matrix (uniform) structure. It was shown that CS NPs had the most sustained release of the 2 formulations, demonstrating a slower linear release post initial ``burst'' and longer duration. The role of particle architecture on the rate of drug release in vitro was confirmed by fitting the experimental data with various kinetic models. This indicated that the release process was a simple diffusion mechanism. The CS NPs were effectively internalized into the endolysosomal compartments of cancer cells and demonstrated an increased cytotoxic efficacy (concentration of a drug that gives half maximal response [rm EC_50] reaching 6.2rmμ M) compared to free drug (rm EC_50 =9rmμ M) and uniform CDDP-distributed NPs (rm EC_50 =7.6rmμ M) in vitro. Thus, these experiments indicate that engineering the structure of PLGA NPs can be exploited to control both the dosage and the release characteristics for improved clinical chemotherapy treatment. | ||||||
BibTeX:
@article{ReaParHarBroVasStrPedEdiKno2017, author = {Reardon, P J T and Parhizkar, M and Harker, A H and Browning, R J and Vassileva, V and Stride, E and Pedley, R B and Edirisinghe, M and Knowles, J C}, title = {Electrohydrodynamic fabrication of core-shell PLGA nanoparticles with controlled release of cisplatin for enhanced cancer treatment}, journal = {International Journal of Nanomedicine}, year = {2017}, volume = {12}, pages = {3913-3926} } |
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ShaBraHuoHarEdiEdi2019 | Shams, T.; Brako, F.; Huo, S.; Harker, A.H.; Edirisinghe, U. & Edirisinghe, M. |
The influence of drug solubility and sampling frequency on metformin and glibenclamide release from double-layered particles: experimental analysis and mathematical modelling
[BibTeX] |
2019 |
J R Soc Interface, Vol. 16 (155) , pp. 20190237. |
article | |
BibTeX:
@article{ShaBraHuoHarEdiEdi2019, author = {Shams, T and Brako, F and Huo, S and Harker, A.H. and Edirisinghe, U. and Edirisinghe, M}, title = {The influence of drug solubility and sampling frequency on metformin and glibenclamide release from double-layered particles: experimental analysis and mathematical modelling}, journal = {J R Soc Interface,}, year = {2019}, volume = {16}, number = {155}, pages = {20190237.}, doi = {https://doi.org/10.1098/rsif.2019.0237} } |
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ShaBriGosRayKerHarSto2005 | Shaw, M.J.; Briddon, P.R.; Goss, J.P.; Rayson, M.J.; Kerridge, A.; Harker, A.H. & Stoneham, A.M. | Importance of Quantum Tunneling in Vacancy-Hydrogen Complexes in Diamond | 2005 |
Physical Review Letters Vol. 95 , pp. 105502-105505 |
article | |
Abstract: Our ab initio calcullations of the hyperfine parameters for negatively
c harged vacancy-hydrogen and nitrogen-vacancy-hydrogen complexes in diamond compare static defect models and mode ls whic h account for the quantum tunneling behavior of hydrogen. T he static models give rise to hyperfine splittings that are inconsistent with the experimental e lectron paramagnetic resonance data. In contrast, the hyperfine parameters for the quantum dynamical models are in agreement with the experimental observations. W e show that the quantum motion of the proton is crucial to the prediction of symmetry and hyperfine constants for two simple defect centers in diamond. Static a priori methods fail for these systems. |
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BibTeX:
@article{ShaBriGosRayKerHarSto2005, author = {Shaw, M J and Briddon, P R and Goss, J P and Rayson, M J and Kerridge, A and Harker, A H and Stoneham, A M}, title = {Importance of Quantum Tunneling in Vacancy-Hydrogen Complexes in Diamond}, journal = {Physical Review Letters}, year = {2005}, volume = {95}, pages = {105502-105505}, note = {AHH} } |
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ShamllaParHarEdiOrlEdi2018 | Shams, T.; Illangakoon, U.E.; Parhizkar, M.; Harker, A.H.; Edirisinghe, S.; Orlu, M. & Edirisinghe, M. |
Electrosprayed microparticles for intestinal delivery of prednisolone
[BibTeX] |
J R Soc Interface Vol. 15 (145) |
article | ||
BibTeX:
@article{ShamllaParHarEdiOrlEdi2018, author = {Shams, T and Illangakoon, U E and Parhizkar, M and Harker, A H and Edirisinghe, S and Orlu, M and Edirisinghe, M}, title = {Electrosprayed microparticles for intestinal delivery of prednisolone}, journal = {J R Soc Interface}, year = {2018}, volume = {15}, number = {145}, doi = {https://doi.org/10.1098/rsif.2018.0491} } |
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ShlHarPucItoCra1993 | Shluger, A.L.; Harker, A.H.; Puchin, V.E.; Itoh, N. & Catlow, C.R.A. | Simulation of defect processes: experiences with the self-trapped exciton | 1993 |
Modelling and Simulation in Materials Science and Engineering Vol. 1 (5) , pp. 673 |
article | |
Abstract: Presents a critical analysis of the applicability of cluster ab initio
many-electron methods to studies of the structure and spectroscopic properties of defects in insulating crystals on the basis of comparison of the results of recent calculations with experimental data for self-trapped excitons. These are archetypal intrinsic defects and the calculation of their properties illustrates almost all the characteristic features of defect studies, including the study of the atomic and electronic structure, diffusion and spectroscopic parameters. |
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BibTeX:
@article{ShlHarPucItoCra1993, author = {Shluger, A L and Harker, A H and Puchin, V E and Itoh, N and Catlow, C R A}, title = {Simulation of defect processes: experiences with the self-trapped exciton}, journal = {Modelling and Simulation in Materials Science and Engineering}, year = {1993}, volume = {1}, number = {5}, pages = {673}, url = {http://stacks.iop.org/0965-0393/1/i=5/a=008} } |
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SmiHar1984 | Smith, D.Y. & Harker, A.H. | Spin-Orbit Effects in Non-Central-Force Systems - Host-Lattice Effects in F-Centers | 1984 |
Physical Review Letters Vol. 52 (1) , pp. 73-76 |
article | |
Abstract: Two new trends associated with spin-orbit effects in a non-central-force
field are evident in recent data for F centers: (1) an inverse power-law dependence of spin-orbit splitting on the lattice parameter of the host crystal and (2) a direct dependence of the splitting on the size of the host-lattice ions. These features may be summarized by a simple semiempirical formula closely related to the Mollwo-Ivey relation for the absorption energy. |
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BibTeX:
@article{SmiHar1984, author = {Smith, D Y and Harker, A H}, title = {Spin-Orbit Effects in Non-Central-Force Systems - Host-Lattice Effects in F-Centers}, journal = {Physical Review Letters}, year = {1984}, volume = {52}, number = {1}, pages = {73-76} } |
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SmiHar1984a | Smith, D.Y. & Harker, A.H. | Host-Lattice Effects in the Spin Orbit Fine Structure of Vacancy-Trapped Electrons | 1984 |
Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions with Materials and Atoms Vol. 1 (2-3) , pp. 445-451 |
article | |
Abstract: Defects in ionic solids involving an electron trapped by an anion
vacancy exhibit several unique properties arising from spin-orbit effects in non-central-force systems, including a complex dependence of the spin-orbit splitting on host-crystal properties. Two such trends evident in new data for F centers are: (a) an approximate inverse power-law dependence of the F-center spin-orbit splitting on the host-crystal lattice parameter and (b) a direct dependence of the splitting on the size of the host-lattice ions. It is demonstrated that the spin-orbit splitting may be described by a semi-empirical formula , F = C_+ r_+d^p+ + C_- r_-d^p- with p ≈ 2.7, where ± are the lattice-ion spin-orbit coupling constants, r_± are the ionic radii, and d is the nearest-neighbour distance This result is shown to be implicit in the general theory, and a geometric interpretation of the result consistent with the Mollwo-Ivey relation for the F-band energy is suggested. |
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BibTeX:
@article{SmiHar1984a, author = {Smith, D Y and Harker, A H}, title = {Host-Lattice Effects in the Spin Orbit Fine Structure of Vacancy-Trapped Electrons}, journal = {Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions with Materials and Atoms}, year = {1984}, volume = {1}, number = {2-3}, pages = {445-451} } |
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SonStoHar1975 | Song, K.S.; Stoneham, A.M. & Harker, A.H. | Electronic structure of the self-trapped exciton in alkali fluorides and chlorides | 1975 |
Journal of Physics C: Solid State Physics Vol. 8 (8) , pp. 1125 |
article | |
Abstract: The authors report pseudopotential calculations for the relaxed exciton
in alkali fluorides ahd chlorides, with emphasis on NaCl. These calculations supplement earlier Hartree-Fock calculations by permitting investigation of a number of specific features. The more extended and higher energy excitations of the electron associated with the exciton are studied and a wider range of host lattices and crystal geometries considered. The most important result is that the origin of the sigma (singlet) and pi (triplet) luminescence bands can be understood: the two bands derive from different orbital states, contrary to previous assumptions. Estimates of hyperfine constants, the sigma - pi splitting and oscillator strengths are also given and agree well with experiment. The results suggest that there should be an additional sigma -polarized band of the self-trapped exciton in the infrared. |
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BibTeX:
@article{SonStoHar1975, author = {Song, K S and Stoneham, A M and Harker, A H}, title = {Electronic structure of the self-trapped exciton in alkali fluorides and chlorides}, journal = {Journal of Physics C: Solid State Physics}, year = {1975}, volume = {8}, number = {8}, pages = {1125}, url = {http://stacks.iop.org/0022-3719/8/i=8/a=016} } |
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SonStoHar1976 | Song K, S.; Stoneham, A.M. & Harker, A.H. | Luminescence and electronic structure of the self-trapped exciton in alkali fluorides and chlorides | 1976 |
Journal of Luminescence Vol. 12-13 , pp. 303 - 308 |
article | |
Abstract: Luminescence of the self-trapped exciton in alkali halides is analysed
on the basis of recent theoretical works. It is shown that the short-lived ?-band originates from an orbital state which is distinct from that of the much studied triplet state. Luminescence from the lowest orbital state consists of two components and this gives rise to the peculiar behaviour of the ?-band, as has been reported recently by Purdy and Murray for KCl. |
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BibTeX:
@article{SonStoHar1976, author = {Song K S and Stoneham, A M and Harker, A H}, title = {Luminescence and electronic structure of the self-trapped exciton in alkali fluorides and chlorides}, journal = {Journal of Luminescence}, year = {1976}, volume = {12-13}, pages = {303 - 308}, note = {Proceeding of the 1975 International Conference on Luminescence}, url = {http://www.sciencedirect.com/science/article/pii/0022231376900971}, doi = {https://doi.org/10.1016/0022-2313(76)90097-1} } |
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StoBloGleHar2010 | Stoneham, M.; Harker, T.; Blomhert, B. & Glen, N. | What Constitutes Proof: Challenges in Wind Harmony Music | 2010 |
Interdisciplinary Science Reviews Vol. 35 (2) , pp. 122-137 |
article | |
Abstract: Proof of authenticity is important both to scholars seeking insights
and to investors more concerned with value. Is a ceramic 1400 years old? Is that music by Mozart? We seek parallels between scientific proof and musical authentication, focussing especially on some of the many opera arrangements for wind ensemble from the years c.1800. Such arrangements incorporate features characteristic of both arranger and original composer. We have developed a novel computer-based analysis based on numbers of rest bars in the instrumental wind parts, a simple but objective approach that works well in known examples. Specific cases analysed here were chosen both for their interest and as demanding tests for the method, including the divertimento containing the St Antoni Chorale, the Donaueschingen octet arrangement of Die Entf\"uhrung, Mozart serenades, and arrangements of sixteen operas for winds. Pleyel was clearly not the composer of the St Antoni divertimento, as often asserted. |
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BibTeX:
@article{StoBloGleHar2010, author = {Stoneham, Marshall and Harker, Tony and Blomhert, Bastiaan and Glen, Nessa}, title = {What Constitutes Proof: Challenges in Wind Harmony Music}, journal = {Interdisciplinary Science Reviews}, year = {2010}, volume = {35}, number = {2}, pages = {122-137}, doi = {https://doi.org/10.1179/030801810X12723585301075} } |
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StoHar1975a | Stoneham, A.M. & Harker, A.H. | Self-Consistent Calculations for Shallow Defects in Semiconductors I Bound Excitons | 1975 |
Journal of Physics C: Solid State Physics Vol. 8 , pp. 1102-1108 |
article | |
Abstract: Shallow defects in semiconductors are of major importance, both scientifically
and technologically. These include donors, acceptors, isoelectronic impurities and various clusters, and may involve trapped carriers or bound excitons. Hopfield provided the key to understanding the more complicated defects by stressing their relation to atomic and molecular systems. The authors have developed a general computer program, SEMELE to exploit this relation further. SEMELE provides a systematic and straightforward way of performing self-consistent calculations on shallow defects and is particularly suited to donor-acceptor pair and related systems. The main assumptions are discussed, together with the various ways of treating central-cell corrections. Results are given for excitons bound to neutral donors in GaP. |
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BibTeX:
@article{StoHar1975a, author = {Stoneham, A M and Harker, A H}, title = {Self-Consistent Calculations for Shallow Defects in Semiconductors I Bound Excitons}, journal = {Journal of Physics C: Solid State Physics}, year = {1975}, volume = {8}, pages = {1102-1108} } |
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StoHar1975b | Stoneham, A.M. & Harker, A.H. | Self-Consistent Calculations for Shallow Defects in Semiconductors II. Donor-acceptor pairs | 1975 |
Journal of Physics C: Solid State Physics Vol. 8 , pp. 1109-1118 |
article | |
Abstract: A general method has been developed for performing self-consistent
calculations for shallow defects or defect complexes in semiconductors. Results are given here for donoracceptor pairs in GaP and a comaprison is made of the various treatments of central-cell corrections and the effects arising from the overlap of the donor and acceptor wavefunctions. Whilst no detailed refitting of host parameters is attempted, it seems likely that the current estimate of the bandgap (2.339 eV) is too large, and the latest estimates of the dielectric constant may also be inaccurate. |
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BibTeX:
@article{StoHar1975b, author = {Stoneham, A M and Harker, A H}, title = {Self-Consistent Calculations for Shallow Defects in Semiconductors II. Donor-acceptor pairs}, journal = {Journal of Physics C: Solid State Physics}, year = {1975}, volume = {8}, pages = {1109-1118} } |
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StoHar1982 | Stoneham, A.M. & Harker, A.H. | Purely Elastic Contributions to Friction | 1982 |
Wear Vol. 80 (3) , pp. 377-380 |
article | |
BibTeX:
@article{StoHar1982, author = {Stoneham, A M and Harker, A H}, title = {Purely Elastic Contributions to Friction}, journal = {Wear}, year = {1982}, volume = {80}, number = {3}, pages = {377-380} } |
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StoHarHar1996 | Stoneham, A.M.; Harding, J.H. & Harker, A.H. |
The shell model and interatomic potentials for ceramics
[BibTeX] |
1996 |
Materials Research Society Bulletin Vol. 21 (2) , pp. 29-35 |
article | |
BibTeX:
@article{StoHarHar1996, author = {Stoneham, A M and Harding, J H and Harker, A H}, title = {The shell model and interatomic potentials for ceramics}, journal = {Materials Research Society Bulletin}, year = {1996}, volume = {21}, number = {2}, pages = {29-35} } |
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StoHarMor2009 | Stoneham, A.M.; Harker, A.H. & Morley, G.W. | Could one make a diamond-based quantum computer? | 2009 |
Journal of Physics: Condensed Matter Vol. 21 (36) , pp. 364222 (10pp) |
article | |
Abstract: We assess routes to a diamond-based quantum computer, where we specifically
look towards scalable devices, with at least 10 linked quantum gates. Such a computer should satisfy the deVincenzo rules and might be used at convenient temperatures. The specific examples that we examine are based on the optical control of electron spins. For some such devices, nuclear spins give additional advantages. Since there have already been demonstrations of basic initialization and readout, our emphasis is on routes to two-qubit quantum gate operations and the linking of perhaps 10-20 such gates. We analyse the dopant properties necessary, especially centres containing N and P, and give results using simple scoping calculations for the key interactions determining gate performance. Our conclusions are cautiously optimistic: it may be possible to develop a useful quantum information processor that works above cryogenic temperatures. |
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BibTeX:
@article{StoHarMor2009, author = {Stoneham, A Marshall and Harker, A H and Morley, Gavin W}, title = {Could one make a diamond-based quantum computer?}, journal = {Journal of Physics: Condensed Matter}, year = {2009}, volume = {21}, number = {36}, pages = {364222 (10pp)}, url = {http://stacks.iop.org/0953-8984/21/364222} } |
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VaiHarHarSau1984 | Vail, J.M.; Harker, A.H.; Harding, J.H. & Saul, P. | Calculations for Electronic Point Defects with Self-Consistent Lattice Polarization - The rm F^+ Centre in MgO | 1984 |
Journal of Physics C: Solid State Physics Vol. 17 (19) , pp. 3401-3414 |
article | |
BibTeX:
@article{VaiHarHarSau1984, author = {Vail, J M and Harker, A H and Harding, J H and Saul, P}, title = {Calculations for Electronic Point Defects with Self-Consistent Lattice Polarization -- The rm F^+ Centre in MgO}, journal = {Journal of Physics C: Solid State Physics}, year = {1984}, volume = {17}, number = {19}, pages = {3401-3414}, note = {ICECAP} } |
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VaiPanHar1987 | Vail, J.M.; Pandey, R. & Harker, A.H. | Simulation of F-Type Centres Using Hartree-Fock Clusters | 1987 |
Crystal Lattice Defects and Amorphous Materials Vol. 15 (1-4) , pp. 13-17 |
article | |
BibTeX:
@article{VaiPanHar1987, author = {Vail, J M and Pandey, R and Harker, A H}, title = {Simulation of F-Type Centres Using Hartree-Fock Clusters}, journal = {Crystal Lattice Defects and Amorphous Materials}, year = {1987}, volume = {15}, number = {1-4}, pages = {13-17}, note = {ICECAP} } |
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WuKerHarFis2008 | Wu, W.; Kerridge, A.; Harker, A.H. & Fisher, A.J. | Structure-dependent exchange in the organic magnets Cu(II)Pc and Mn(II)Pc | 2008 |
Physical Review Review B Vol. 77 (18) , pp. 184403 (1-12) |
article | |
Abstract: We study exchange couplings in the organic magnets copper(II) phthalocyanine
[Cu(II)Pc] and manganese(II) phthalocyanine [Mn(II)Pc] by a combination of Green's function perturbation theory and ab initio density-functional theory (DFT). Based on the indirect exchange model, our perturbation-theory calculation of Cu(II)Pc qualitatively agrees with the experimental observations. DFT calculations performed on Cu(II)Pc dimer show a very good quantitative agreement with exchange couplings that our theoretical group extracts by using a global fitting for the magnetization measurements to a spin-1/2 Bonner-Fisher model. These two methods give us remarkably consistent trends for the exchange couplings in Cu(II)Pc when changing the stacking angles. The situation is more complex for Mn(II)Pc owing to the competition between superexchange and indirect exchange. |
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BibTeX:
@article{WuKerHarFis2008, author = {Wu, Wei and Kerridge, A and Harker, A H and Fisher, A J}, title = {Structure-dependent exchange in the organic magnets Cu(II)Pc and Mn(II)Pc}, journal = {Physical Review Review B}, year = {2008}, volume = {77}, number = {18}, pages = {184403 (1-12)}, doi = {https://doi.org/10.1103/PhysRevB.77.184403} } |
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ZhaShaHarParEdi2018 | Zhang, Y.; Shams, T.; Harker, A.H.; Parhizkar, M. & Edirisinghe, M. |
Effect of copolymer composition on particle morphology and release behavior in vitro using progesterone.
[BibTeX] |
2018 |
Materials & Design Vol. 159, , pp. 57-67 |
article | |
BibTeX:
@article{ZhaShaHarParEdi2018, author = {Zhang, Y and Shams, T and Harker, A H and Parhizkar, M and Edirisinghe, M}, title = {Effect of copolymer composition on particle morphology and release behavior in vitro using progesterone.}, journal = {Materials & Design}, year = {2018}, volume = {159,}, pages = {57-67}, doi = {https://doi.org/10.1016/j.matdes.2018.08.024} } |
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Har1988 | Harker, A.H. |
Elastic Waves in Solids, with applications to nondestructive testing of pipelines
[BibTeX] |
1988 | book | ||
BibTeX:
@book{Har1988, author = {Harker, A H}, title = {Elastic Waves in Solids, with applications to nondestructive testing of pipelines}, publisher = {Adam Hilger}, year = {1988} } |
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doi:10.1080/00107519008213790 | Harker | Book reviews | 1990 |
Contemporary Physics Vol. 31 (6) , pp. 405-424 |
bookreview | |
BibTeX:
@bookreview{doi:10.1080/00107519008213790, author = {Harker}, title = {Book reviews}, journal = {Contemporary Physics}, year = {1990}, volume = {31}, number = {6}, pages = {405-424}, url = { http://dx.doi.org/10.1080/00107519008213790 |
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doi:10.1080/00107519208219539 | Harker | Book reviews | 1992 |
Contemporary Physics Vol. 33 (2) , pp. 137-159 |
bookreview | |
BibTeX:
@bookreview{doi:10.1080/00107519208219539, author = {Harker}, title = {Book reviews}, journal = {Contemporary Physics}, year = {1992}, volume = {33}, number = {2}, pages = {137-159}, url = { http://dx.doi.org/10.1080/00107519208219539 |
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doi:10.1080/00107519308213822 | Harker | Book reviews | 1993 |
Contemporary Physics Vol. 34 (4) , pp. 215-232 |
bookreview | |
BibTeX:
@bookreview{doi:10.1080/00107519308213822, author = {Harker}, title = {Book reviews}, journal = {Contemporary Physics}, year = {1993}, volume = {34}, number = {4}, pages = {215-232}, url = { http://dx.doi.org/10.1080/00107519308213822 |
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doi:10.1080/00107519308222088 | Harker | Book review | 1993 |
Contemporary Physics Vol. 34 (5) , pp. 281-294 |
bookreview | |
BibTeX:
@bookreview{doi:10.1080/00107519308222088, author = {Harker}, title = {Book review}, journal = {Contemporary Physics}, year = {1993}, volume = {34}, number = {5}, pages = {281-294}, url = { http://dx.doi.org/10.1080/00107519308222088 |
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doi:10.1080/00107519408217496 | Harker | Book reviews | 1994 |
Contemporary Physics Vol. 35 (1) , pp. 45-72 |
bookreview | |
BibTeX:
@bookreview{doi:10.1080/00107519408217496, author = {Harker}, title = {Book reviews}, journal = {Contemporary Physics}, year = {1994}, volume = {35}, number = {1}, pages = {45-72}, url = { http://dx.doi.org/10.1080/00107519408217496 |
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doi:10.1080/00107519608217539 | Harker | Book reviews | 1996 |
Contemporary Physics Vol. 37 (6) , pp. 479-499 |
bookreview | |
BibTeX:
@bookreview{doi:10.1080/00107519608217539, author = {Harker}, title = {Book reviews}, journal = {Contemporary Physics}, year = {1996}, volume = {37}, number = {6}, pages = {479-499}, url = { http://dx.doi.org/10.1080/00107519608217539 |
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Har1996 | Harker, A.H. | Computer algebra | 1996 |
Contemporary Physics Vol. 37 (2) , pp. 155-157 |
bookreview | |
BibTeX:
@bookreview{Har1996, author = {Harker , A H}, title = {Computer algebra}, journal = {Contemporary Physics}, year = {1996}, volume = {37}, number = {2}, pages = {155-157}, url = { http://dx.doi.org/10.1080/00107519608230342 |
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Har1997a | Harker | Classical Mechanics With Maple By R. L. Green | 1997 |
Contemporary Physics Vol. 38 (6) , pp. 433 |
bookreview | |
BibTeX:
@bookreview{Har1997a, author = {Harker}, title = {Classical Mechanics With Maple By R. L. Green}, journal = {Contemporary Physics}, year = {1997}, volume = {38}, number = {6}, pages = {433}, note = {Classical Mechanics with Maple By R. L. GREEN 1995, DM48×00 (pbk), pp. ix + 173. Springer-Verlag, ISBN 0 387 94512 1. Scope: supplementary text. Level: undergraduate}, url = { http://dx.doi.org/10.1080/001075197182243 |
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Har1998 | Harker | The Beginner's Guide to Mathematica Version 3 by J Glynn and T Gray | 1998 |
Contemporary Physics Vol. ? (?) , pp. 91 |
bookreview | |
BibTeX:
@bookreview{Har1998, author = {Harker}, title = {The Beginner's Guide to Mathematica Version 3 by J Glynn and T Gray}, journal = {Contemporary Physics}, year = {1998}, volume = {?}, number = {?}, pages = {91} } |
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Har1999 | Harker | Fatigue Of Materials: Second Edition by S. Suresh | 1999 |
Contemporary Physics Vol. 40 (6) , pp. 441-442 |
bookreview | |
BibTeX:
@bookreview{Har1999, author = {Harker}, title = {Fatigue Of Materials: Second Edition by S. Suresh}, journal = {Contemporary Physics}, year = {1999}, volume = {40}, number = {6}, pages = {441-442}, note = {Fatigue of Materials: Secon d Edition By S. SURESH 1998, Ł75.00 (hbk ), Ł27.95 (pbk ), pp. xxi+ 679. Cambridge University Press, ISBN 0 521 57046 8 (hbk ), ISBN 0 521 57847 (pbk ). Scope: text. Level: postgraduate and specialist.}, url = { http://dx.doi.org/10.1080/001075199181323 |
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Har2001 | Harker, A.H. | Diffusion in Solids. Field Theory, Solid-State Principles, and Applications | 2001 |
Contemporary Physics Vol. 42 (1) , pp. 66-67 |
bookreview | harker |
BibTeX:
@bookreview{Har2001, author = {Harker, A H}, title = {Diffusion in Solids. Field Theory, Solid-State Principles, and Applications}, journal = {Contemporary Physics}, year = {2001}, volume = {42}, number = {1}, pages = {66-67}, note = {Diffusion in Solids. Field Theory, Solid-State Principles, and Applications By M. E. GLICKSMAN Wiley. 1999, Ł58.50 (hbk) , pp. xx+ 472. ISBN 0 471 23972 0. Scope: monograph. Level: specialist.}, doi = {https://doi.org/10.1080/00107510010007521} } |
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Har2002 | Harker | Mathematical Modelling in Continuum Mechanics by R. Teman And A. Miranville | 2002 |
Contemporary Physics Vol. 43 (1) , pp. 33 |
bookreview | |
BibTeX:
@bookreview{Har2002, author = {Harker}, title = {Mathematical Modelling in Continuum Mechanics by R. Teman And A. Miranville}, journal = {Contemporary Physics}, year = {2002}, volume = {43}, number = {1}, pages = {33}, note = {Mathematical Modelling in Continuum Mechanics By R. TEMAN and A. MIRANVILLE 2001, Ł54.95 (hbk), pp. xiii+290. Cambridge University Press, ISBN 0 521 64362 7. Scope: text. Level: postgraduate.}, url = { http://dx.doi.org/10.1080/00107510110084714 |
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Har2003 | Harker, A.H. | The Formation and Logic of Quantum Mechanics | 2003 |
Contemporary Physics Vol. 44 (1) , pp. 86-87 |
bookreview | harker |
BibTeX:
@bookreview{Har2003, author = {Harker, A H}, title = {The Formation and Logic of Quantum Mechanics}, journal = {Contemporary Physics}, year = {2003}, volume = {44}, number = {1}, pages = {86-87}, note = {The Formation and Logic of Quantum Mechanics. Volume I: The Formation of the Atomic Models By M. TAKETANI 2001, Ł125.00 (hbk), pp. xv+249. World Scienti®c, ISBN 981 02 4970 5 (vol. 1), 981 02 4601 3 (set). Scope: monograph. Level: postgraduate and specialist. The Formation and Logic of Quantum Mechanics. Volume II: The Way to Quantum Mechanics By M. TAKETANI and M. NAGASAKI 2001, Ł125.00 (hbk), pp. xvi+286. World Scienti®c, ISBN 981 02 4971 3 (vol. II), 981 02 4601 3 (set). Scope: Monograph. Level: Postgraduate and Specialist. The Formation and Logic of Quantum Mechanics. Volume III: The Establishment and Logic of Quantum Mechanics By M. TAKETANI and M. NAGASAKI 2001, Ł125.00 (hbk), pp. xxiii+320. World Scienti®c, ISBN 981 02 4972 1 (vol. III), 981 02 4601 3 (set). Scope: Monograph. Level: Postgraduate and Specialist.}, doi = {https://doi.org/10.1080/00107510302716} } |
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Har2003a | Harker | Numerical Recipes In C++. The Art of Scientificc Computing, Second Edition by W. H. Press, S. A. Teukoisky, W. T. Vetterling and B. P. Flannery | 2003 |
Contemporary Physics Vol. 44 (2) , pp. 176-177 |
bookreview | |
BibTeX:
@bookreview{Har2003a, author = {Harker}, title = {Numerical Recipes In C++. The Art of Scientificc Computing, Second Edition by W. H. Press, S. A. Teukoisky, W. T. Vetterling and B. P. Flannery}, journal = {Contemporary Physics}, year = {2003}, volume = {44}, number = {2}, pages = {176-177}, note = {Numerical Recipes in C++. The Art of Scienti®c Computing, second edition By W. H. PRESS, S. A. TEUKOISKY, W. T. VETTERLING and B. P. FLANNERY 2002, Ł45.00, US$70.00 (hbk), pp. xxviii+1002. Cam- bridge University Press, ISBN 0 521 75033 4. Scope: text- book. Level: postgraduate.}, url = { http://dx.doi.org/10.1080/0010751031000095125 |
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Har2003b | Harker | General Physics Problem Solving with CAS DERIVE By L. Magiera | 2003 |
Contemporary Physics Vol. 44 (4) , pp. 370-371 |
bookreview | |
BibTeX:
@bookreview{Har2003b, author = {Harker}, title = {General Physics Problem Solving with CAS DERIVE By L. Magiera}, journal = {Contemporary Physics}, year = {2003}, volume = {44}, number = {4}, pages = {370-371}, note = {General Physics Problem Solving with CAS DERIVE By L. MAGIERA 2001, US$89.00 (hbk), pp. x+251. Nova Science, ISBN 1 59033 057 9. Scope: textbook. Level: undergraduate.}, url = { http://dx.doi.org/10.1080/0951192031000135977 |
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Har2003c | Harker | Mathematical Modelling. Case Studies From Industry By E. Cumberbatch And A. Fitt | 2003 |
Contemporary Physics Vol. 44 (2) , pp. 173 |
bookreview | |
BibTeX:
@bookreview{Har2003c, author = {Harker}, title = {Mathematical Modelling. Case Studies From Industry By E. Cumberbatch And A. Fitt}, journal = {Contemporary Physics}, year = {2003}, volume = {44}, number = {2}, pages = {173}, note = {Mathematical Modelling. Case Studies from Industry By E. CUMBERBATCH and A. FITT 2001, Ł23.95, US34.95 (pbk), Ł65.00, US95.00 (hbk), pp. xx+299. Cambridge University Press, ISBN 0 521 01173 6 (pbk), ISBN 0 521 65007 0 (hbk). Scope: multi-author review. Level: postgraduate and specialist.}, url = { http://dx.doi.org/10.1080/0010751031000095125 |
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Har2005a | Harker | A Celebration of Mathematical Modeling. The Joseph B. Keller Anniversary Volume, edited by D. Givoli, M.J. Grote and G.C. Papanicolaou | 2005 |
Contemporary Physics Vol. 46 (2) , pp. 141 |
bookreview | |
BibTeX:
@bookreview{Har2005a, author = {Harker}, title = {A Celebration of Mathematical Modeling. The Joseph B. Keller Anniversary Volume, edited by D. Givoli, M.J. Grote and G.C. Papanicolaou}, journal = {Contemporary Physics}, year = {2005}, volume = {46}, number = {2}, pages = {141}, note = {A Celebration of Mathematical Modeling. The Joseph B. Keller Anniversary Volume, edited by D. Givoli, M.J. Grote and G.C. Papanicolaou, Kluwer Academic Publishers, Dordrecht, 2004, pp. xxxix + 241, Ł97.00, $US154.00, hardback (ISBN 1 4020 1842 8). Scope: multi-author review. Level: postgraduate and specialist.}, url = { http://dx.doi.org/10.1080/00107510512331323625 |
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Har2005b | Harker | Simulating Hamiltonian Dynamics by B. Leimkuhler and S. Reich | 2005 |
Contemporary Physics Vol. 46 (6) , pp. 465 |
bookreview | |
BibTeX:
@bookreview{Har2005b, author = {Harker}, title = {Simulating Hamiltonian Dynamics by B. Leimkuhler and S. Reich}, journal = {Contemporary Physics}, year = {2005}, volume = {46}, number = {6}, pages = {465}, note = {Simulating Hamiltonian Dynamics, in the series Cambridge Monographs on Applied and Computational Mathematics, by B. Leimkuhler and S. Reich, Cambridge University Press, Cambridge, 2005, pp. xviţ 379, Ł45.00, US$75.00, hardback (ISBN 0 521 77290 7). Scope: monograph. Level: postgraduate.}, url = { http://dx.doi.org/10.1080/00107510500361290 |
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Har2008 | Harker | Electronic structure calculations for solids and molecules: theory and computational methods, by J. Kohanoff | 2008 |
Contemporary Physics Vol. 49 (1) , pp. 59 |
bookreview | |
BibTeX:
@bookreview{Har2008, author = {Harker}, title = {Electronic structure calculations for solids and molecules: theory and computational methods, by J. Kohanoff}, journal = {Contemporary Physics}, year = {2008}, volume = {49}, number = {1}, pages = {59}, note = {Electronic structure calculations for solids and molecules: theory and computational methods, by J. Kohanoff, Cambridge, Cambridge University Press, 2006, 370 pp., Ł41.99 (hardback), (ISBN-13 978 0 521 81591 8; ISBN-10 0 521 81591 6). Scope: textbook/reference. Level: graduates}, url = { http://dx.doi.org/10.1080/00107510701731747 |
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Har2008a | Harker | Tribology on the Small Scale: A Bottom Up Approach to Friction, Lubrication and Wear, by C.M. Mate | 2008 |
Contemporary Physics Vol. 49 (6) , pp. 465 |
bookreview | |
BibTeX:
@bookreview{Har2008a, author = {Harker}, title = {Tribology on the Small Scale: A Bottom Up Approach to Friction, Lubrication and Wear, by C.M. Mate}, journal = {Contemporary Physics}, year = {2008}, volume = {49}, number = {6}, pages = {465}, note = {Tribology on the Small Scale: A Bottom Up Approach to Friction, Lubrication and Wear, by C.M. Mate, Oxford, Oxford University Press, 2008, 400 pp., Ł55.00 (hardback), ISBN 978 0 19 852678 0. Scope: monograph. Level: postgraduate and researcher.}, url = { http://www.tandfonline.com/doi/abs/10.1080/00107510802631242 |
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Har2008b | Harker | Elasticity with Mathematica: An Introduction to Continuum Mechanics and Linear Elasticity, by A. Constantinescu and A. Korsunsky | 2008 |
Contemporary Physics Vol. 49 (6) , pp. 455 |
bookreview | |
BibTeX:
@bookreview{Har2008b, author = {Harker}, title = {Elasticity with Mathematica: An Introduction to Continuum Mechanics and Linear Elasticity, by A. Constantinescu and A. Korsunsky}, journal = {Contemporary Physics}, year = {2008}, volume = {49}, number = {6}, pages = {455}, note = {Elasticity with Mathematica: An Introduction to Continuum Mechanics and Linear Elasticity, by A. Constantinescu and A. Korsunsky, Cambridge, Cambridge University Press, 2007, 26 pp., Ł60.00 (hardback), ISBN 978 0 521 84201 3. Scope: textbook. Level: postgraduate.}, url = { http://www.tandfonline.com/doi/abs/10.1080/00107510802631242 |
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Har2010 | Harker, A.H. | Physics and Applications of Negative Refractive Index Materials, by S. Anantha Ramakrishna and T.M. Grzegorczyk | 2010 |
Contemporary Physics Vol. 51 (4) , pp. 373-374 |
bookreview | |
BibTeX:
@bookreview{Har2010, author = {Harker, A H }, title = {Physics and Applications of Negative Refractive Index Materials, by S. Anantha Ramakrishna and T.M. Grzegorczyk}, journal = {Contemporary Physics}, year = {2010}, volume = {51}, number = {4}, pages = {373-374}, url = { http://dx.doi.org/10.1080/00107510903257459 |
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Har2011 | Harker, A.H. | Concepts of Nanochemistry, by Ludovico Cademartiri and Geoffrey A. Ozin | 2011 |
Contemporary Physics Vol. 52 (2) , pp. 162-162 |
bookreview | |
BibTeX:
@bookreview{Har2011, author = {Harker, A H}, title = {Concepts of Nanochemistry, by Ludovico Cademartiri and Geoffrey A. Ozin}, journal = {Contemporary Physics}, year = {2011}, volume = {52}, number = {2}, pages = {162-162}, url = { http://dx.doi.org/10.1080/00107514.2010.537771 |
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Har2011a | Harker, A.H. | Statistical and Thermal Physics with Computer Applications, by Harvey Gould and Jan Tobochnik | 2011 |
Contemporary Physics Vol. 52 (5) , pp. 492-493 |
bookreview | |
BibTeX:
@bookreview{Har2011a, author = {Harker, A H}, title = {Statistical and Thermal Physics with Computer Applications, by Harvey Gould and Jan Tobochnik}, journal = {Contemporary Physics}, year = {2011}, volume = {52}, number = {5}, pages = {492-493}, url = { http://dx.doi.org/10.1080/00107514.2011.580376 |
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Har2012 | Harker, A.H. | Numerical Modeling in Materials Science and Engineering, Springer Series in Computational Mathematics, Vol. 32, by M. Rappaz, M. Bellet, and M. Deville, translated by R. Snyder | 2012 |
Contemporary Physics Vol. 53 (3) , pp. 280-281 |
bookreview | |
BibTeX:
@bookreview{Har2012, author = {Harker, A H}, title = {Numerical Modeling in Materials Science and Engineering, Springer Series in Computational Mathematics, Vol. 32, by M. Rappaz, M. Bellet, and M. Deville, translated by R. Snyder}, journal = {Contemporary Physics}, year = {2012}, volume = {53}, number = {3}, pages = {280-281}, url = { http://dx.doi.org/10.1080/00107514.2012.661784 |
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Har2012a | Harker, A.H. | Nanocomputing: Computational Physics for Nanoscience and Nanotechnology, by James J.Y. Hsu | 2012 |
Contemporary Physics Vol. 53 (3) , pp. 265-266 |
bookreview | |
BibTeX:
@bookreview{Har2012a, author = {Harker, A H}, title = {Nanocomputing: Computational Physics for Nanoscience and Nanotechnology, by James J.Y. Hsu}, journal = {Contemporary Physics}, year = {2012}, volume = {53}, number = {3}, pages = {265-266}, url = { http://dx.doi.org/10.1080/00107514.2012.657691 |
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Har2012b | Harker, A.H. | Wavefronts and Rays as Characteristics and Asymptotics, by A. Bóna and M.A. Slawinski | 2012 |
Contemporary Physics Vol. 53 (3) , pp. 265-265 |
bookreview | |
BibTeX:
@bookreview{Har2012b, author = {Harker, A H}, title = {Wavefronts and Rays as Characteristics and Asymptotics, by A. Bóna and M.A. Slawinski}, journal = {Contemporary Physics}, year = {2012}, volume = {53}, number = {3}, pages = {265-265}, url = { http://dx.doi.org/10.1080/00107514.2012.657690 |
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Har2013 | Harker, A.H. | Computational Methods for Electromagnetic Phenomena: Electrostatics in Solvation, Scattering and Electron Transport, by Cai Wei | 2013 |
Contemporary Physics Vol. 54 (5) , pp. 263-264 |
bookreview | |
BibTeX:
@bookreview{Har2013, author = {AH Harker}, title = {Computational Methods for Electromagnetic Phenomena: Electrostatics in Solvation, Scattering and Electron Transport, by Cai Wei}, journal = {Contemporary Physics}, year = {2013}, volume = {54}, number = {5}, pages = {263-264}, url = { http://dx.doi.org/10.1080/00107514.2013.836571 |
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Har2013a | Harker, A.H. | Time-Dependent Density-Functional Theory: Concepts and Applications, by Carsten A. Ullrich | 2013 |
Contemporary Physics Vol. 54 (1) , pp. 55-56 |
bookreview | |
BibTeX:
@bookreview{Har2013a, author = {Harker, A H}, title = {Time-Dependent Density-Functional Theory: Concepts and Applications, by Carsten A. Ullrich}, journal = {Contemporary Physics}, year = {2013}, volume = {54}, number = {1}, pages = {55-56}, url = { http://dx.doi.org/10.1080/00107514.2012.739657 |
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Har2014 | Harker, A.H. | Phase Transitions: Modern Applications (2nd edition), by Moshe Gitterman | 2014 |
Contemporary Physics Vol. 55 (4) , pp. 355-356 |
bookreview | harker |
BibTeX:
@bookreview{Har2014, author = {Harker, A H}, title = {Phase Transitions: Modern Applications (2nd edition), by Moshe Gitterman}, journal = {Contemporary Physics}, year = {2014}, volume = {55}, number = {4}, pages = {355-356}, url = { http://dx.doi.org/10.1080/00107514.2014.948928 |
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Har2014a | Harker, A.H. | Understanding the Nanotechnology Revolution, by Edward L. Wolf and Manasa Medikonda | 2014 |
Contemporary Physics Vol. 55 (2) , pp. 122-122 |
bookreview | |
BibTeX:
@bookreview{Har2014a, author = {AH Harker}, title = {Understanding the Nanotechnology Revolution, by Edward L. Wolf and Manasa Medikonda}, journal = {Contemporary Physics}, year = {2014}, volume = {55}, number = {2}, pages = {122-122}, url = { http://dx.doi.org/10.1080/00107514.2013.877522 |
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Har2014b | Harker, A.H. | Graphene: A New Paradigm in Condensed Matter and Device Physics, by E.L. Wolf | 2014 |
Contemporary Physics Vol. 55 (4) , pp. 355-355 |
bookreview | |
BibTeX:
@bookreview{Har2014b, author = {Harker, A H}, title = {Graphene: A New Paradigm in Condensed Matter and Device Physics, by E.L. Wolf}, journal = {Contemporary Physics}, year = {2014}, volume = {55}, number = {4}, pages = {355-355}, url = { http://dx.doi.org/10.1080/00107514.2014.948926 |
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Har2014c | Harker, A.H. | Computational Methods for Physics, by Joel Franklin | 2014 |
Contemporary Physics Vol. 55 (2) , pp. 125-125 |
bookreview | |
BibTeX:
@bookreview{Har2014c, author = {Harker, A H}, title = {Computational Methods for Physics, by Joel Franklin}, journal = {Contemporary Physics}, year = {2014}, volume = {55}, number = {2}, pages = {125-125}, url = { http://dx.doi.org/10.1080/00107514.2013.877525 |
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Har2015 | Harker, A.H. | Nonlinear Science: An Interactive Mathematica Notebook, by David K. Campbell, Sebastian M. Marotta and Thomas A. Tanury | 2015 |
Contemporary Physics Vol. 56 (2) , pp. 236-237 |
bookreview | |
BibTeX:
@bookreview{Har2015, author = {Harker, A H}, title = {Nonlinear Science: An Interactive Mathematica Notebook, by David K. Campbell, Sebastian M. Marotta and Thomas A. Tanury}, journal = {Contemporary Physics}, year = {2015}, volume = {56}, number = {2}, pages = {236-237}, url = { http://dx.doi.org/10.1080/00107514.2014.988178 |
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Har2015a | Harker, A.H. | Symmetry of Crystals and Molecules, by Mark Ladd | 2015 |
Contemporary Physics Vol. 56 (2) , pp. 237-238 |
bookreview | |
BibTeX:
@bookreview{Har2015a, author = {Harker, A H}, title = {Symmetry of Crystals and Molecules, by Mark Ladd}, journal = {Contemporary Physics}, year = {2015}, volume = {56}, number = {2}, pages = {237-238}, url = { http://dx.doi.org/10.1080/00107514.2014.988180 |
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Har2016 | Harker, A.H. | Semiconductors: Bonds and Bands, by David K. Ferry | 2016 |
Contemporary Physics Vol. 57 (1) , pp. 141-141 |
bookreview | |
BibTeX:
@bookreview{Har2016, author = {Harker, A H}, title = {Semiconductors: Bonds and Bands, by David K. Ferry}, journal = {Contemporary Physics}, year = {2016}, volume = {57}, number = {1}, pages = {141-141}, url = { http://dx.doi.org/10.1080/00107514.2015.1100219 |
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Har2016a | Harker, A.H. | Materials Modelling using Density Functional Theory: Properties and Predictions, by Giustino Feliciano | 2016 |
Contemporary Physics Vol. 57 (1) , pp. 140-141 |
bookreview | |
BibTeX:
@bookreview{Har2016a, author = {Harker, A H}, title = {Materials Modelling using Density Functional Theory: Properties and Predictions, by Giustino Feliciano}, journal = {Contemporary Physics}, year = {2016}, volume = {57}, number = {1}, pages = {140-141}, url = { http://dx.doi.org/10.1080/00107514.2015.1100218 |
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Har2016b | Harker, A.H. | Phase transitions in materials | 2016 |
Contemporary Physics Vol. 57 (1) , pp. 141-142 |
bookreview | |
BibTeX:
@bookreview{Har2016b, author = {A H Harker}, title = {Phase transitions in materials}, journal = {Contemporary Physics}, year = {2016}, volume = {57}, number = {1}, pages = {141-142}, url = { http://dx.doi.org/10.1080/00107514.2015.1111412 |
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Har2016c | Harker, A.H. | The basics of crystallography and diffraction, (Fourth Edition), by Christopher Hammond | 2016 |
Contemporary Physics Vol. 0 (0) , pp. 1-1 |
bookreview | |
BibTeX:
@bookreview{Har2016c, author = {Harker, A H}, title = {The basics of crystallography and diffraction, (Fourth Edition), by Christopher Hammond}, journal = {Contemporary Physics}, year = {2016}, volume = {0}, number = {0}, pages = {1-1}, url = { http://dx.doi.org/10.1080/00107514.2016.1156752 |
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Har2016d | Harker, A.H. | Electrical conduction in graphene and nanotubes, by Shigeji Fujita and Akira Suzuki | 2016 |
Contemporary Physics Vol. 0 (0) , pp. 1-1 |
bookreview | |
BibTeX:
@bookreview{Har2016d, author = {Harker, A H}, title = {Electrical conduction in graphene and nanotubes, by Shigeji Fujita and Akira Suzuki}, journal = {Contemporary Physics}, year = {2016}, volume = {0}, number = {0}, pages = {1-1}, url = { http://dx.doi.org/10.1080/00107514.2016.1156760 |
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Harker2003 | Harker, A.H. | General physics problem solving with CAS DERIVE | 2003 |
Contemporary Physics Vol. 33 (4) , pp. 370-371 |
bookreview | |
BibTeX:
@bookreview{Harker2003, author = {Harker, A H}, title = {General physics problem solving with CAS DERIVE}, journal = {Contemporary Physics}, year = {2003}, volume = {33}, number = {4}, pages = {370-371}, note = {AHH} } |
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Harker2003a | Harker, A.H. | Numerical Recipes in C++ | 2003 | Contemporary Physics (44) , pp. 176-177 | bookreview | |
BibTeX:
@bookreview{Harker2003a, author = {Harker, A H}, title = {Numerical Recipes in C++}, journal = {Contemporary Physics}, year = {2003}, number = {44}, pages = {176-177}, note = {AHH} } |
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Harker2011 | Harker, A.H. | Understanding Solid State Physics, by Sharon Ann Holgate | 2011 |
Contemporary Physics Vol. 52 (2) , pp. 169-169 |
bookreview | |
BibTeX:
@bookreview{Harker2011, author = {Harker, A H}, title = {Understanding Solid State Physics, by Sharon Ann Holgate}, journal = {Contemporary Physics}, year = {2011}, volume = {52}, number = {2}, pages = {169-169}, url = { http://dx.doi.org/10.1080/00107514.2010.537779 |
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HarHarShlSto1998 | Harding, J.H.; Harker, A.H.; Shluger, A.L. & Stoneham, A.M. Tomsia, A.P. & Glaeser, A.M. (Hrsg.) |
Making the connection between atomistic modelling of interfaces and real materials (
Ceramic Microstructures; Control at the Atomic Level
)
[BibTeX] |
1998 | Ceramic Microstructures; Control at the Atomic Level , pp. 13-22 | inbook | |
BibTeX:
@inbook{HarHarShlSto1998, author = {Harding, J H and Harker, A H and Shluger, A L and Stoneham, A M}, title = {Ceramic Microstructures; Control at the Atomic Level}, publisher = {Plenum N.Y.}, year = {1998}, pages = {13-22} } |
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HarOgiTem1990a | Harker, A.H.; Ogilvy, J.A. & Temple, J.A.G. Cohen, G. (Hrsg.) | Numerical Models of Elastic Wave Propagation through Inhomogeneous Anisotropic Materials in Two and Three Spatial Dimensions ( Mathematical and Numerical Aspects of Wave Propagation Phenomena ) | 1990 | Mathematical and Numerical Aspects of Wave Propagation Phenomena , pp. 165-183 | inbook | |
BibTeX:
@inbook{HarOgiTem1990a, author = {Harker, A H and Ogilvy, J A and Temple, J A G}, title = {Mathematical and Numerical Aspects of Wave Propagation Phenomena}, publisher = {SIAM}, year = {1990}, pages = {165-183} } |
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HarTem1992 | Harker, A.H. & Temple, J.A.G. Povey, M. & McClements, J. (Hrsg.) |
Propagation and attenuation of ultrasound in suspensions (
Developments in Acoustics and Ultrasonics
)
[BibTeX] |
1992 | Developments in Acoustics and Ultrasonics , pp. 19-31 | inbook | |
BibTeX:
@inbook{HarTem1992, author = {Harker, A H and Temple, J A G}, title = {Developments in Acoustics and Ultrasonics}, publisher = {IoP Publishing}, year = {1992}, pages = {19-31} } |
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BenHarPerPriDes1994 | Bennett, M.J.; Harker, A.H.; Perkins, R.; Price, J.B. & Desport, J.A. | The oxidation behaviour of alumina forming ferritic oxide dispersion strengthened alloys | 1994 | Proceedings of the 1st Mexican Symposium and 2nd International Workshop on Metallic Corrosion, Merida, Yucatan, Mexico, 7-11 March 1994 | inproceedings | |
BibTeX:
@inproceedings{BenHarPerPriDes1994, author = {Bennett, M J and Harker, A H and Perkins, R and Price, J B and Desport, J A}, title = {The oxidation behaviour of alumina forming ferritic oxide dispersion strengthened alloys}, booktitle = {Proceedings of the 1st Mexican Symposium and 2nd International Workshop on Metallic Corrosion, Merida, Yucatan, Mexico, 7-11 March 1994}, year = {1994} } |
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ChoHarHarMulSmiSto1991 | Choy, T.C.; Harding, J.H.; Harker, A.H.; Mulheran, P.A.; Smith, L.W. & Stoneham, A.M. Doyama, M.; Suzuki, T.; Kihara, J. & Yamamoto, R. (Hrsg.) | Modelling Mesoscopic Systems | 1991 | Computer aided innovation of new materials (Proceedings of the first International Conference and Exhibition on Computer Applications to Materials Science and Engineering - CAMSE90 , pp. 869 | inproceedings | |
BibTeX:
@inproceedings{ChoHarHarMulSmiSto1991, author = {Choy, T C and Harding, J H and Harker, A H and Mulheran, P A and Smith, L W and Stoneham, A M}, title = {Modelling Mesoscopic Systems}, booktitle = {Computer aided innovation of new materials (Proceedings of the first International Conference and Exhibition on Computer Applications to Materials Science and Engineering - CAMSE90}, publisher = {North-Holland}, year = {1991}, pages = {869}, note = {Sunshine City, Tokyo, August 28-31 1990} } |
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GriCatShlPanBaeHar1991 | Grimes, R.W.; Catlow, C.R.A.; Shluger, A.L.; Pandey, R.; Baetzold, R. & Harker, A.H. Bristowe, P.D.; Epperson, J.E. & Griffith, J E snd Lilientalweber, Z. (Hrsg.) | Simulating Vacancy, Impurity and Electronic Defect States in MgO, LiCl and rm La_2CuO_4 Using Quantum Cluster and Classical Lattice Simulation Techniques in a Consistent Manner | 1991 |
Vol. 14th International Symposium on Characterization of Defects in Materials, Boston, Ma, November 26-29, 1990 (209) Defects In Materials , pp. 257-262 |
inproceedings | |
BibTeX:
@inproceedings{GriCatShlPanBaeHar1991, author = {Grimes, R W and Catlow, C R A and Shluger, A L and Pandey, R and Baetzold, R and Harker, A H}, title = {Simulating Vacancy, Impurity and Electronic Defect States in MgO, LiCl and rm La_2CuO_4 Using Quantum Cluster and Classical Lattice Simulation Techniques in a Consistent Manner}, booktitle = {Defects In Materials}, year = {1991}, volume = {14th International Symposium on Characterization of Defects in Materials, Boston, Ma, November 26-29, 1990}, number = {209}, pages = {257-262}, note = {ICECAP} } |
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Har1980 | Harker, A.H. | Quantum mechanical cluster calculations | 1980 | Proceedings of Daresbury Study Weekend, 9-11 May 1980 | inproceedings | |
BibTeX:
@inproceedings{Har1980, author = {Harker, A H}, title = {Quantum mechanical cluster calculations}, booktitle = {Proceedings of Daresbury Study Weekend, 9-11 May 1980}, year = {1980} } |
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Har1993 | Harker, A.H. Kanert, O. & Spaeth, J.-M. (Hrsg.) |
Self-consistent embedded cluster calculations for defects in insulating solids
[BibTeX] |
1993 | Proceedings ot the International Conference on Defects in Insulating Crystals , pp. 219-234 | inproceedings | |
BibTeX:
@inproceedings{Har1993, author = {Harker, A H}, title = {Self-consistent embedded cluster calculations for defects in insulating solids}, booktitle = {Proceedings ot the International Conference on Defects in Insulating Crystals}, publisher = {World Scientific}, year = {1993}, pages = {219-234} } |
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Har1997 | Harker, A.H. Tennyson, R.C. & Kiv, A.E. (Hrsg.) | Hybrid quantum mechanical and potential model for studies in solids | 1997 | Computer modelling of electronic and atomic processes in solids | inproceedings | |
BibTeX:
@inproceedings{Har1997, author = {Harker, A H}, title = {Hybrid quantum mechanical and potential model for studies in solids}, booktitle = {Computer modelling of electronic and atomic processes in solids}, publisher = {Kluwer}, year = {1997} } |
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HarHar1998 | Harding, J.H. & Harker, A.H. Bullard, J.W.; Chen, L.-Q.; Kalia, R.K. & Stoneham, A.M. (Hrsg.) Mater. Res. Soc, Warrendale, PA, USA | Simulation of the growth of heterostructures | 1998 | Computational and Mathematical Models of Microstructural Evolution Symposium , pp. 55-64 | inproceedings | |
Abstract: The production and morphology of heterostructures presents problems
at a variety of length-scales. A common problem is the production and accommodation of stresses in the film due to mis-match. We first discuss examples of atomistic nucleation and growth at interfaces and the use of atomistic simulations to obtain parameters for rate-theory models of cluster and film growth. We then consider the effect of stress on growing films. In strained-layer semiconductor systems, for example, the growth of small islands gives rise to stress distributions which differ strongly from those in continuous layers. Interesting strain effects are also observed in ceramics. We discuss the relationship between stress and the growth and morphology of films, where effective medium models may be used to derive effective bulk properties for films with imperfections such as porosity and cracks. |
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BibTeX:
@inproceedings{HarHar1998, author = {Harding, J H and Harker, A H}, title = {Simulation of the growth of heterostructures}, booktitle = {Computational and Mathematical Models of Microstructural Evolution Symposium}, publisher = {Mater. Res. Soc, Warrendale, PA, USA}, year = {1998}, pages = {55-64}, note = {AHH} } |
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HarSchStiTayTem1990 | Harker, A.H.; Schofield, P.; Stimpson, B.P.; Taylor, R.G. & Temple, J.A.G. Thompson, D.O. & Chimenti, D.E. (Hrsg.) |
Ultrasound in suspensions: theory and experiment
[BibTeX] |
1990 |
Vol. 10A Proceedings of the Review of Progress in Quantitative Nondestructive Evaluation , pp. 169-175 |
inproceedings | |
BibTeX:
@inproceedings{HarSchStiTayTem1990, author = {Harker, A H and Schofield, P and Stimpson, B P and Taylor, R G and Temple, J A G}, title = {Ultrasound in suspensions: theory and experiment}, booktitle = {Proceedings of the Review of Progress in Quantitative Nondestructive Evaluation}, publisher = {Plenum Press, NY}, year = {1990}, volume = {10A}, pages = {169-175} } |
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ISI:A1990BT11D00074 | Windsor, C.G. & Harker, A.H. Thellier, N. (Hrsg.) | Multi-Variate Financial Index Prediction - A Neural Network Study | 1990 | International Neural Network Conference, Vols 1 and 2 , pp. 357-360 | inproceedings | |
BibTeX:
@inproceedings{ISI:A1990BT11D00074, author = {Windsor, C G And Harker, A H}, title = {Multi-Variate Financial Index Prediction - A Neural Network Study}, booktitle = {International Neural Network Conference, Vols 1 and 2}, year = {1990}, pages = {357-360}, note = {1990 International Neural Network Conference, Paris, France, July 09-13, 1990} } |
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ISI:A1990BU67E00029 | Naish, C.C.; Harker, A. & Carney, R.F.A. Page, C.L.; Treadaway, K.W.J. & Bamforth, P.B. (Hrsg.) | Concrete Inspection - Interpretation of Potential and Resistivity Measurements | 1990 | Corrosion of Reinforcement in Concrete , pp. 314-332 | inproceedings | |
BibTeX:
@inproceedings{ISI:A1990BU67E00029, author = {Naish, C C and Harker, A and Carney, R F A}, title = {Concrete Inspection - Interpretation of Potential and Resistivity Measurements}, booktitle = {Corrosion of Reinforcement in Concrete}, year = {1990}, pages = {314-332}, note = {3rd International Symposium on Corrosion of Reinforcement in Concrete Construction, Wishaw, England, May 21-24, 1990} } |
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JaiHarSto1993 | Jain, S.C.; Harker, A.H. & Stoneham, A.M. |
Stability and performance of rm Ge_x Si_1-x heterostructure bipolar devices
[BibTeX] |
1993 | Proceedings of the VIIth International Workshop on the Physics of Semiconductor Devices, New Delhi, December 1993 | inproceedings | |
BibTeX:
@inproceedings{JaiHarSto1993, author = {Jain, S C and Harker, A H and Stoneham, A M}, title = {Stability and performance of rm Ge_x Si_1-x heterostructure bipolar devices}, booktitle = {Proceedings of the VIIth International Workshop on the Physics of Semiconductor Devices, New Delhi, December 1993}, year = {1993} } |
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JaiHarSto1993a | Jain, S.C.; Harker, A.H. & Stoneham, A.M. | Predicting the density of P_b defects at the rm Si/SiO_2 interface | 1993 | 24th IEEE Semiconductor Interface Specialists Conference | inproceedings | |
BibTeX:
@inproceedings{JaiHarSto1993a, author = {Jain, S C and Harker, A H and Stoneham, A M}, title = {Predicting the density of P_b defects at the rm Si/SiO_2 interface}, booktitle = {24th IEEE Semiconductor Interface Specialists Conference}, publisher = {IEEE}, year = {1993}, note = {Dec 9-1 1,1993, Fort Lauderdale, Florida} } |
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JaiPinHarWilMaeMer1995 | Jain, S.C.; Pinardi, K.; Harker, A.H.; Willander, M.; Maes, H.E. & Mertens, R.P. |
Stresses in selectively grown III-V semiconductor stripes and buried quantum wire lasers: effect on optical properties
[BibTeX] |
1995 | Proceedings of the 25th European Solid State Device Research Conference ESSDERC-95 , pp. 459-462 | inproceedings | |
BibTeX:
@inproceedings{JaiPinHarWilMaeMer1995, author = {Jain, S C and Pinardi, K and Harker, A H and Willander, M and Maes, H E and Mertens, R P}, title = {Stresses in selectively grown III-V semiconductor stripes and buried quantum wire lasers: effect on optical properties}, booktitle = {Proceedings of the 25th European Solid State Device Research Conference ESSDERC-95}, publisher = {Editions Frontieres, Gif sur Yvette, Fance}, year = {1995}, pages = {459-462} } |
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JohAshChiFinHar1996 | Johnson, P.C.; Asher, J.; Chivers, D.C.; Findlay, D.J.S. & Harker, A.H. |
Carrier lifetime control: processes and model
[BibTeX] |
1996 |
Vol. 4 IEE Colloquium on new developments in power semiconductor devices - Digest - No 1996/146 , pp. 1-3 |
inproceedings | |
BibTeX:
@inproceedings{JohAshChiFinHar1996, author = {Johnson, P C and Asher, J and Chivers, D C and Findlay, D J S and Harker, A H}, title = {Carrier lifetime control: processes and model}, booktitle = {IEE Colloquium on new developments in power semiconductor devices - Digest - No 1996/146}, year = {1996}, volume = {4}, pages = {1-3} } |
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LanHarSaf2001 | Lange, A.; Harker, A.H. & Saffari, N. Thompson, D.O. & Chimenti, D.E. (Hrsg.) |
A Coupled Semi-Analytical/Boundary Method for Modeling Ultrasound Scattering in Titanium Metal-Matrix Composites
[BibTeX] |
2001 |
Vol. 20 Review of Progress in Quantitative NDE , pp. 43-50 |
inproceedings | |
BibTeX:
@inproceedings{LanHarSaf2001, author = {Lange, A and Harker, A H and Saffari, N}, title = {A Coupled Semi-Analytical/Boundary Method for Modeling Ultrasound Scattering in Titanium Metal-Matrix Composites}, booktitle = {Review of Progress in Quantitative NDE}, year = {2001}, volume = {20}, pages = {43-50} } |
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LanHarSaf2001a | Lange, A.; Harker, A.H. & Saffari, N. | Modelling Elastic-Wave Multiple Scattering in Metal-Matrix Composites | 2001 | Proceedings of the 5th International Conference on Theoretical and Computational Acoustics, Beijing, China, 2001 | inproceedings | |
BibTeX:
@inproceedings{LanHarSaf2001a, author = {Lange, A and Harker, A H and Saffari, N}, title = {Modelling Elastic-Wave Multiple Scattering in Metal-Matrix Composites}, booktitle = {Proceedings of the 5th International Conference on Theoretical and Computational Acoustics, Beijing, China, 2001}, year = {2001}, note = {AHH} } |
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LanHarSaf2002 | Lange, A.; Harker, A.H. & Saffari, N. Shang, E.R.; Li, Q. & Gao, T.F. (Hrsg.) World Scientific |
Modelling of elastic wave multiple-scattering in metal-matrix composites
[BibTeX] |
2002 | Theoretical and Computational Acoustics 2001 , pp. 357-366 | inproceedings | |
BibTeX:
@inproceedings{LanHarSaf2002, author = {Lange, A and Harker, A H and Saffari, N}, title = {Modelling of elastic wave multiple-scattering in metal-matrix composites}, booktitle = {Theoretical and Computational Acoustics 2001}, year = {2002}, pages = {357-366} } |
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LanHarSaf2003 | Lange, A.; Harker, A.H. & Saffari, N. |
A multilevel multipole method for modelling elastic-wave multiple scattering in fibre-reinforced composites
[BibTeX] |
2003 |
Vol. 22 Review of Progress in Quantitative Non-Destructive Evaluation, 2003 , pp. 85-92 |
inproceedings | |
BibTeX:
@inproceedings{LanHarSaf2003, author = {Lange, A and Harker, A H and Saffari, N}, title = {A multilevel multipole method for modelling elastic-wave multiple scattering in fibre-reinforced composites}, booktitle = {Review of Progress in Quantitative Non-Destructive Evaluation, 2003}, year = {2003}, volume = {22}, pages = {85-92} } |
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OgiHarChaHawStr1989 | Ogilvy, J.A.; Harker, A.H.; Charlesworth, J.P.; Hawker B, M. & Stringfellow, M.W. Thompson, D.O. & Chimenti, D.E. (Hrsg.) |
Improving inspection of austenitic steels: a combined theoretical and experimental approach
[BibTeX] |
1989 | 15th Annual Review of Progress in Quantitative Nondestructive Evaluation , pp. 2097-2103 | inproceedings | |
BibTeX:
@inproceedings{OgiHarChaHawStr1989, author = {Ogilvy, J A and Harker, A H and Charlesworth, J P and Hawker B M and Stringfellow, M W}, title = {Improving inspection of austenitic steels: a combined theoretical and experimental approach}, booktitle = {15th Annual Review of Progress in Quantitative Nondestructive Evaluation}, publisher = {Plenum Press, NY}, year = {1989}, pages = {2097-2103} } |
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SafLivHar2007 | Saffari, N.; Livshics, A. & Harker, A.H. | Modelling for Ultrasonic Inspection of Aerospace Composites | 2007 | 1st International Conference on Technical Inspection and NDT - Mozil | inproceedings | |
Abstract: Modern engineering materials require carefully controlled microstructures
in order to ensure that the desired material properties are achieved. Leading manufacturers in the aerospace industry are working towards the introduction of new composite materials such as metal matrix composites (MMCs) for engine components and non-crimped fabric composites (NCFCs) in the next generation of military and civil aircraft. MMCs have improved stiffness and strength-to-weight ratio for high temperature applications and NCFCs have better damage tolerance and lower cost compared with traditional unidirectional prepreg composites. Deviations from the desired microstructure may lead to a catastrophic degradation in the properties of these materials. These can arise due to manufacturing errors and also in-service degradation. Ultrasonic non-destructive evaluation (NDE) is potentially the most powerful and appropriate method for evaluation of the microstructure and defects in these materials. It is however recognised that new NDE techniques are needed, based on a better understanding of wave propagation in these complex materials, before engineers can be confident in introducing MMCs and NCFCs into service. Overcoming the problems associated with the inspection of these novel composites will provide a great impetus towards even more widespread adoption of some of these advanced materials. Complex microstructures present a formidable problem for ultrasonic inspection, since by their very nature they strongly scatter the incident ultrasound. This can have many different effects depending on the nature of the microstructure and the frequency of the ultrasound. In some aerospace applications it is highly desirable to have a very regular layout for the reinforcing fibres in MMCs. Modelling elastic wave propagation through these materials demonstrates that they can behave as phononic crystals and exhibit elastic band-gaps. The purpose of this investigation is to see if in the range of frequencies commonly used for the non-destructive evaluation of these structures we can observe interesting band structures and whether the appearance and characteristics of these bands can be used for the characterisation of defects within the material. We have investigated the degree of regularity needed in the distribution of the fibres for the appearance of pass bands. Other effects investigated are changes of pass-band characteristics due to the presence of defects, the interaction length and the size of the receiving aperture. The study has been performed using a Finite Element model which has also been compared with a plane wave expansion method. The results demonstrate very interesting features in the transmission and reflection spectra with potential important implications for the quantitative NDE of these composite materials. |
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BibTeX:
@inproceedings{SafLivHar2007, author = {Saffari, N and Livshics, A and Harker, A H}, title = {Modelling for Ultrasonic Inspection of Aerospace Composites}, booktitle = {1st International Conference on Technical Inspection and NDT - Mozil}, year = {2007} } |
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StoAepBayBoyFisGreHarRen2003 | Stoneham, A.M.; Aeppli, G.; Bayvel, P.; Boyd, I.; Fisher, A.J.; Greenland, P.T.; Harker, A.H. & Renner, C. | Quantum Information Processing Exploiting the Excited State | 2003 | International Symposium on Photonics and Spintronics in Semiconductor Nanostructures , pp. 2-11 | inproceedings | |
BibTeX:
@inproceedings{StoAepBayBoyFisGreHarRen2003, author = {Stoneham, A M and Aeppli, G and Bayvel, P and Boyd, I and Fisher, A J and Greenland, P T and Harker, A H and Renner, C}, title = {Quantum Information Processing Exploiting the Excited State}, booktitle = {International Symposium on Photonics and Spintronics in Semiconductor Nanostructures}, year = {2003}, pages = {2-11}, note = {PSSN 2003, Kyoto 2-3 November 2003 http://www.ipc.kit.ac.jp/ takaghra/pssn.html} } |
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StoHarRam2001 | Stoneham, A.M.; Harker, A.H. & Ramos, M.M.D. Societe Francaise du Vide | Charge and the unexpected: solid state processes involving charged species | 2001 | Proceedings of the 4th International Conference on Electric Charges in Non-Conductive Materials, Tours, France, 2-6 July 2001 , pp. 15-22 | inproceedings | |
BibTeX:
@inproceedings{StoHarRam2001, author = {Stoneham, A M and Harker, A H and Ramos, M M D}, title = {Charge and the unexpected: solid state processes involving charged species}, booktitle = {Proceedings of the 4th International Conference on Electric Charges in Non-Conductive Materials, Tours, France, 2-6 July 2001}, year = {2001}, pages = {15-22}, note = {AHH} } |
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StoHarShlSzySof2000 | Stoneham, A.M.; Harker, A.H.; Shluger, A.L.; Szymanski, M.A. & Sofield, C.J. Katayama-Yoshida, H. (Hrsg.) | Modelling silicon oxidation and the oxide dielectric: Can silicon oxidation be solved? | 2000 |
Vol. Physics and Control of Defects in Semiconductors Physics and Control of Defects in Semiconductors |
inproceedings | |
BibTeX:
@inproceedings{StoHarShlSzySof2000, author = {A M Stoneham and A H Harker and A L Shluger and M A Szymanski and C J Sofield}, title = {Modelling silicon oxidation and the oxide dielectric: Can silicon oxidation be solved?}, booktitle = {Physics and Control of Defects in Semiconductors}, publisher = {Gordon and Breach}, year = {2000}, volume = {Physics and Control of Defects in Semiconductors}, note = {AHH} } |
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WacHarHil1990 | Wace, P.F.; Harker, A.H. & Hills, D.L. |
Removal of concrete layers from biological shields by microwaves
[BibTeX] |
1990 | Proceedings of the International Conference on Decommissioning Nuclear Installations, Brussels, 24-27 October 1989 , pp. 291-300 | inproceedings | |
BibTeX:
@inproceedings{WacHarHil1990, author = {Wace, P F and Harker, A H and Hills, D L}, title = {Removal of concrete layers from biological shields by microwaves}, booktitle = {Proceedings of the International Conference on Decommissioning Nuclear Installations, Brussels, 24-27 October 1989}, publisher = {Elsevier}, year = {1990}, pages = {291-300} } |
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AHHQIP06 | Harker, A.H. |
Living on the Edge: Donor States near Interfaces
[BibTeX] |
2007 | (QIP07AHH06) School: UCL Basic Technology QIP Project | techreport | |
BibTeX:
@techreport{AHHQIP06, author = {Harker, A H}, title = {Living on the Edge: Donor States near Interfaces}, school = {UCL Basic Technology QIP Project}, year = {2007}, number = {QIP07AHH06} } |
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HarMat1989 | Harker, A.H. & Matthews, J.R. | Modelling the Fuel Behaviour during the Chernobyl Accident | 1989 | (AERE-TP 1344) School: UKAEA Harwell | techreport | |
BibTeX:
@techreport{HarMat1989, author = {Harker, A H and Matthews, J R}, title = {Modelling the Fuel Behaviour during the Chernobyl Accident}, school = {UKAEA Harwell}, year = {1989}, number = {AERE-TP 1344} } |
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HarMatWit1990 | Matthews, J.R.; Harker, A.H. & Whitmell, D.P. |
Oxide fuel fragmentation in transients
[BibTeX] |
1990 | (AERE-TP 1350) School: AERE Harwell | techreport | |
BibTeX:
@techreport{HarMatWit1990, author = {Matthews, J R and Harker, A H and Whitmell, D P}, title = {Oxide fuel fragmentation in transients}, school = {AERE Harwell}, year = {1990}, number = {AERE-TP 1350} } |
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HarOgi1989 | Harker, A.H. & Ogilvy, J.A. | Coherent Wave Propagation in Inhomogeneous Materials - a Comparison of Theoretical Models | 1989 | (TP1338) School: AERE Harwell | techreport | |
Abstract: The frequency dependent behaviour of coherent wave propagation in
inhomogeneous materials is studied using several theoretical models. The predictions of a ray tracing model are compared with those of a two-dimensional finite difference model, for both isotropic and anisotropic inhomogeneous materials. The effects of frequency are studied and it is shown how the ray tracing model may be modified to incorporate the low frequency regime, in addition to the usual high frequency regime for which ray tracing approximations are valid. A further comparison is made between the ray tracing solution and an analytical solution, for electromagnetic plane waves propagating in a material with a one-dimensionally varying dielectric constant. The amplitude of the reflected wave is calculated, with good agreement between the two models over a wide range of frequencies, including low frequencies. |
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BibTeX:
@techreport{HarOgi1989, author = {Harker, A H And Ogilvy, J A}, title = {Coherent Wave Propagation in Inhomogeneous Materials - a Comparison of Theoretical Models}, school = {AERE Harwell}, year = {1989}, number = {TP1338}, note = {Published later in Ultrasonics.} } |
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HarOgiTem1990b | Harker, A.H.; Ogilvy, J.A. & Temple, J.A.G. | Models for rough defects and anisotropic media | 1990 | (AEA-InTec-0070) School: UKAEA | techreport | |
BibTeX:
@techreport{HarOgiTem1990b, author = {Harker, A H and Ogilvy, J A and Temple, J A G}, title = {Models for rough defects and anisotropic media}, school = {UKAEA}, year = {1990}, number = {AEA-InTec-0070} } |
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HarTem1995 | Harker, A.H. & Temple, J.A.G. | Hydrogen Explosions in the Roof of a Cavern Roof Repository | 1995 | (AEA-TPD-334) School: AEA Technology | techreport | |
BibTeX:
@techreport{HarTem1995, author = {Harker, A H and Temple, J A G}, title = {Hydrogen Explosions in the Roof of a Cavern Roof Repository}, school = {AEA Technology}, year = {1995}, number = {AEA-TPD-334} } |
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JaiWilHarSto1989 | Jain, U.; Harker, A.H.; Stoneham, A.M. & Williams, D.E. | Effect of Electrode Geometry on Sensor Response | 1989 | (AERE-R13485) School: AERE Harwell | techreport | |
BibTeX:
@techreport{JaiWilHarSto1989, author = {Jain, U and Harker, A H and Stoneham, A M and Williams, D E}, title = {Effect of Electrode Geometry on Sensor Response}, school = {AERE Harwell}, year = {1989}, number = {AERE-R13485}, note = {Later published in Sensors and Actuators} } |
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JaiWilStoHar1989 | Jain, U.; Williams, D.E.; Stoneham, A.M. & Harker, A.H. | Temperature dependence of the conductivity of a gas sensor | 1989 | (AERE-R13486) School: AERE Harwell | techreport | |
BibTeX:
@techreport{JaiWilStoHar1989, author = {Jain, U and Williams, D E and Stoneham, A M and Harker, A H}, title = {Temperature dependence of the conductivity of a gas sensor}, school = {AERE Harwell}, year = {1989}, number = {AERE-R13486} } |
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QIP04AHH01 | Harker, A.H. |
Spatial distributions of defects
[BibTeX] |
2004 | (QIP04AHH01) School: UCL | techreport | |
BibTeX:
@techreport{QIP04AHH01, author = {Harker, A H}, title = {Spatial distributions of defects}, school = {UCL}, year = {2004}, number = {QIP04AHH01} } |
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QIP08AHH08 | Harker, A.H. |
Excitation and Exchange Energies in Donor Pairs
[BibTeX] |
2008 | (QIP08AHH08) School: UCL | techreport | |
BibTeX:
@techreport{QIP08AHH08, author = {Harker, A H}, title = {Excitation and Exchange Energies in Donor Pairs}, school = {UCL}, year = {2008}, number = {QIP08AHH08} } |
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