Publications

Bishop, R, Craig, DC, Dance, IG, Scudder, ML & Ung, AT 1999, 'Interpenetrating inclusion lattices: Comparison of the beta-hydroquinone and ellipsoidal clathrate structures', JOURNAL OF STRUCTURAL CHEMISTRY, vol. 40, no. 5, pp. 663-671.
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Crystallization of 2,7-dimethyltricyclo[43.1.13,8]undecane-syn-2,syn-7-diol 2 from acetonitrile or dichloro-methane yields the compounds (2)4-(guest) in space group 141/acd which are further examples of the ellipsoidal clathrate structure. Both enantiomers of 2 are linked through (O-H)4 cycles of hydrogen bonds to form a three-dimensional sublattice. Two inversion related sublattices interpenetrate thereby generating a superlattice with guest-occupied voids situated between the two individual sublattices. The two X-ray structures are compared and contrasted with that of Powells (hydroquinone)3 (SO2) clathrate compound.

Braithwaite, DH, Holzapfel, C & Williams, DBG 1999, 'Stereoselective Thallium-induced Ring Contraction of Glycals', Journal of Chemical Research, no. 2, pp. 108-109.
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Bruce, D, Fu, SL, Armstrong, S & Dean, RT 1999, 'Human apo-lipoprotein B from normal plasma contains oxidised peptides', INTERNATIONAL JOURNAL OF BIOCHEMISTRY & CELL BIOLOGY, vol. 31, no. 12, pp. 1409-1420.
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Davies, MJ, Fu, SL, Wang, HJ & Dean, RT 1999, 'Stable markers of oxidant damage to proteins and their application in the study of human disease', FREE RADICAL BIOLOGY AND MEDICINE, vol. 27, no. 11-12, pp. 1151-1163.
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Fleischer, K, Toth, M, Phillips, MR, Zou, J, Li, G & Chua, SJ 1999, 'Depth profiling of GaN by cathodoluminescence microanalysis', APPLIED PHYSICS LETTERS, vol. 74, no. 8, pp. 1114-1116.
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We present the results of a depth-resolved cathodoluminescence (CL) and transmission electron microscopy study of autodoped GaN grown on sapphire. Depth-resolved CL analysis can be used for depth profiling of the yellow luminescence (YL) center concentra

Holzapfel, CW, Portwig, M & Williams, DBG 1999, 'Carbohydrates as spiroketal precursors', South African Journal of Chemistry, vol. 52, no. 4, pp. 165-167.
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The preparation of some chiral spiroketals from carbohydrate precursors is described. The reversibility of the Lewis acid-catalysed ketalisation reaction ensured the dominance of the anomeric effect in determining the stereochemical outcome of the spiroketalisation step. In this way, enantiomerically pure products could be obtained from readily available starting materials.

Ian R., W, Andrew M., M, Mark G., H & Samoc, M 1999, 'Organometallic Complexes in Nonlinear Optics II: Third-Order Nonlinearities and Optical Limiting Studies', Advances In Organometallic Chemistry, Vol 43, vol. 43, pp. 349-405.
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Jeoffreys, GR, Ung, AT, Pyne, SG, Skelton, BW & White, AH 1999, 'Synthesis of thiazole analogues of the immunosuppressive agent (1R,2S,3R)-2-acetyl-4(5)-(1,2,3,4-tetrahydroxybutyl)imidazole', JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 1, vol. 16, no. 16, pp. 2281-2291.
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Jolliffe, KA, Langford, SJ, Ranasinghe, MG, Shephard, MJ & Paddon-Row, MN 1999, 'Design and Synthesis of Two (Pseudo)symmetric Giant Trichromophoric Systems Containing the C₆₀ Chromophore', The Journal of Organic Chemistry, vol. 64, no. 4, pp. 1238-1246.
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Kim, DG, Seong, TY, Baik, YJ, Kalceff, MAS & Phillips, MR 1999, 'Cathodoluminescence of diamond films grown on pretreated Si(001) substrates by microwave plasma chemical vapour deposition', DIAMOND AND RELATED MATERIALS, vol. 8, no. 2-5, pp. 712-716.
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Diamond films were grown on a.c. bias-enhanced nucleated Si(001) wafers using different CH4 concentrations by microwave plasma chemical vapour deposition. Cathodoluminescence (CL) spectra from the films exhibit emission components which are associated wi

Leon, R, Okuno, JO, Lawton, RA, Stevens-Kalceff, M, Phillips, MR, Zou, J, Cockayne, DJH & Lobo, C 1999, 'Dislocation-induced changes in quantum dots: Step alignment and radiative emission', APPLIED PHYSICS LETTERS, vol. 74, no. 16, pp. 2301-2303.
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McDonagh, AM, Humphrey, MG, Samoc, M & Luther-Davies, B 1999, 'Organometallic Complexes for Nonlinear Optics. 17.¹ Synthesis, Third-Order Optical Nonlinearities, and Two-Photon Absorption Cross Section of an Alkynylruthenium Dendrimer', Organometallics, vol. 18, no. 25, pp. 5195-5197.
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A soluble, oxidatively and thermally very stable alkynylruthenium dendrimer 1,3,5-C6H3(4-C≡C-C6H 4C≡C-trans-[Ru(dppe)2]C≡C-3,5-C 6H3-{4-C≡CC6-H 4C≡C-trans-[Ru(C≡CPh)(dppe)2]} 2)3, containing a large two-dimensional π-delocalized system, has been prepared using an experimentally straightforward convergent synthetic approach. The first third-order nonlinear optical (NLO) measurements of an organometallic dendrimer have been obtained using the Z-scan technique at a wavelength of 800 nm. Progression from 1,3,5-C6H3-(4-C≡CC6H 4C≡C-trans-[Ru(dppe)2]C≡CPh)3 to the dendrimer results in (i) no loss of optical transparency, (ii) an increase in the second hyperpolarizability, γ, which is proportionately greater than either the increase in the number of phenylethynyl groups or the extinction coefficient for the important MLCT band, and (iii) a dramatic enhancement of two-photon absorption.

McDonagh, AM, Humphrey, MG, Samoc, M, Luther-Davies, B, Houbrechts, S, Wada, T, Sasabe, H & Persoons, A 1999, 'Organometallic Complexes for Nonlinear Optics. 16.¹ Second and Third Order Optical Nonlinearities of Octopolar Alkynylruthenium Complexes', Journal of the American Chemical Society, vol. 121, no. 6, pp. 1405-1406.
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Phillips, MR & Ott, DM 1999, 'Crosstalk due to optical fiber nonlinearities in WDM CATV lightwave systems', JOURNAL OF LIGHTWAVE TECHNOLOGY, vol. 17, no. 10, pp. 1782-1792.
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CrosstaIk in a two-wavelength 1550-nm standard fiber system at subcarrier frequencies 50-800 MHz is investigated. The dependence of the crosstalk on subcarrier frequency, wavelength spacing, and optical power is measured and analyzed. The observed crosst

Phillips, MR & Ott, DM 1999, 'WDM lightwave system crosstalk by optical Kerr effect with polarisation-dependent loss', ELECTRONICS LETTERS, vol. 35, no. 20, pp. 1764-1765.
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WDM-system crosstalk is generated by nonlinear polarisation modulation (the optical Kerr effect) followed by polarisation dependent loss (PDL). Theory and experiment Show that at typical PDL values, this crosstalk. can exceed that from stimulated Raman s

Phillips, MR, Toth, M & Drouin, D 1999, 'Depletion layer imaging using a gaseous secondary electron detector in an environmental scanning electron microscope', APPLIED PHYSICS LETTERS, vol. 75, no. 1, pp. 76-78.
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We present a method for imaging depletion layers using the gaseous secondary electron detector (GSED) employed in environmental scanning electron microscopes. GSED images of a p-n junction were obtained from a Si P+PN power diode. Behavior of the junction contrast as a function of imaging conditions is unrelated to reported GSED contrast formation mechanisms [ A. L. Fletcher, B. L. Thiel, and A. M. Donald, J. Phys. D 30, 2249 (1997)]. Optimum imaging conditions are presented, and the contrast behavior is interpreted in terms of a previously unreported induced current component in GSED images. The presented technique is unique as it will enable imaging of depletion layers in uncoated semiconductor/oxide devices in controlled gaseous environments at elevated specimen temperatures. © 1999 American Institute of Physics.

Sanni, LA, Fu, SL, Dean, RT, Bloomfield, G, Stocker, R, Chaudhri, G, Dinauer, MC & Hunt, NH 1999, 'Are reactive oxygen species involved in the pathogenesis of murine cerebral malaria?', JOURNAL OF INFECTIOUS DISEASES, vol. 179, no. 1, pp. 217-222.
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To investigate the involvement of oxidative tissue damage in the pathogenesis of murine cerebral malaria (CM), brain levels of protein carbonyls, 3,4-dihydroxyphenylalanine(DOPA), 0-tyrosine, and dityrosine were measured during Plasmodium berghei ANKA (PbA) and P. berghei K173 (PbK) infections. During PbA infection in a CM model, brain levels of the substances were similar to those in uninfected mice. The role of phagocyte-derived reactive oxygen species in the pathogenesis of CM was examined in $gp91_{phox}$ gene knockout mice. The course of CM in these mice was the same as in their wild type counterparts. To examine whether superoxide production in the central nervous system could have occurred via increased xanthine oxidase activity, brain concentrations of urate were measured in CM mice and in mice infected with PbK (which does not cause CM). Brain urate concentration increased significantly in both groups of mice, suggesting that purine breakdown is not specific to CM. These results indicate that reactive oxygen species probably do not contribute to the pathogenesis of murine CM

Toth, M & Phillips, MR 1999, 'Detection of Cr impurities in GaN by room temperature cathodoluminescence spectroscopy', APPLIED PHYSICS LETTERS, vol. 75, no. 25, pp. 3983-3985.
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Trace levels of Cr impurities in epitaxial GaN grown on sapphire substrates were investigated using cathodoluminescence (CL) spectroscopy. CL emissions characteristic of Cr in an octahedral crystal field were observed from beta-Ga2O3 overlayers produced

Toth, M, Fleischer, K & Phillips, MR 1999, 'Direct experimental evidence for the role of oxygen in the luminescent properties of GaN', PHYSICAL REVIEW B, vol. 59, no. 3, pp. 1575-1578.
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We present experimental evidence of electron-beam-induced diffusion of O and H in unintentionally doped n-type GaN grown on a sapphire substrate. Impurity diffusion was investigated using cathodoluminescence kinetics and imaging at 4 and 300 K and by wav

Toth, M, Fleischer, K & Phillips, MR 1999, 'Electron beam induced impurity electro-migration in unintentionally doped GaN', MRS INTERNET JOURNAL OF NITRIDE SEMICONDUCTOR RESEARCH, vol. 4, pp. 1-6.
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Electron beam induced electromigration of O-N(+) and H+ impurities in unintentionally n-doped GaN was investigated using cathodoluminescence (CL) kinetics profiling, CL imaging of regions pre-irradiated with a stationary electron beam, and wavelength dis

Wang, GX, Bradhurst, DH, Liu, HK & Dou, SX 1999, 'Improvement of electrochemical properties of the spinel LiMn2O4 using a Cr dopant effect', Solid State Ionics, vol. 120, no. 1-4, pp. 95-101.
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Wang, GX, Yao, P, Zhong, S, Bradhurst, DH, Dou, SX & Liu, HK 1999, 'Electrochemical study on orthorhombic LiMnO2 as cathode in rechargeable lithium batteries', Journal of Applied Electrochemistry, vol. 29, no. 12, pp. 1423-1426.
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Zhu, JG, Zhong, JJ, Ramsden, VS & Guo, YG 1999, 'Power losses of soft magnetic composite materials under two-dimensional excitation', JOURNAL OF APPLIED PHYSICS, vol. 85, no. 8, pp. 4403-4405.
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Soft magnetic composite materials produced by powder metallurgy techniques can be very useful for construction of low cost small motors. However, the rotational core losses and the corresponding B-H relationships of soft magnetic composite materials with

Zhu, JG, Zhong, JJ, Ramsden, VS & Guo, YG 1999, 'Power losses of soft magnetic composite materials under two-dimensional excitation', Journal of Applied Physics, vol. 85, no. 8 II A, pp. 4403-4405.
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Soft magnetic composite materials produced by powder metallurgy techniques can be very useful for construction of low cost small motors. However, the rotational core losses and the corresponding B-H relationships of soft magnetic composite materials with two-dimensional rotating fluxes have neither been supplied by the manufacturers nor reported in the literature. This article reports the core loss measurement of a soft magnetic composite material, SOMALOY™ 500, Höganäs AB, Sweden, under two-dimensional excitations. The principle of measurement, testing system, and power loss calculation are presented. The results are analyzed and discussed. © 1999 American Institute of Physics.

Guo, Y, Zhu, J & Ramsden, VS 1970, 'Calculation of Cogging Torque in Claw Pole Permanent Magnet Motors', Proceedings of Australasian Universities Power Engineering Conference, Australasian Universities Power Engineering Conference, University of Northern Territory, Darwin, Australia, pp. 343-347.

Guo, YG, Zhu, JG & Ramsden, VS 1970, 'Design and construction of a single phase claw pole permanent magnet motor using composite magnetic material', RENEWABLE ENERGY: TECHNOLOGIES & POLICIES FOR SUSTAINABLE DEVELOPMENT, World Renewable Energy Congress, MURDOCH UNIV, PERTH, AUSTRALIA, pp. 181-186.

Lu, HY, Zhu, JG, Ramsden, VS & Hui, SYR 1970, 'Measurement and modeling of stray capacitances in high frequency transformers', 30th Annual IEEE Power Electronics Specialists Conference. Record. (Cat. No.99CH36321), 30th Annual IEEE Power Electronics Specialists Conference, IEEE, Charleston, SC, USA, pp. 763-768.
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This paper proposes an approach to incorporate stray capacitances into a dynamic circuit model of high frequency transformers. The measuring techniques for stray capacitances in high frequency transformers and inductors are presented. A 500W transformer in a full bridge inverter operating at 25 kHz has been simulated with the new model and the theoretical results are confirmed by experiments.

Ramsden, VS, Watterson, PA, Hunter, GP, Zhu, JG, Holliday, WM, Lovatt, HC, Wu, W, Kalan, BA, Collocoft, SC, Dunlop, JB, Gwan, PB & Mecrow, BC 1970, 'High-performance electric machines for renewable energy generation and efficient drives', RENEWABLE ENERGY: TECHNOLOGIES & POLICIES FOR SUSTAINABLE DEVELOPMENT, World Renewable Energy Congress, MURDOCH UNIV, PERTH, AUSTRALIA, pp. 191-197.

Tendys, T, Jian Guo Zhu, Ramsden, V & Dymond, M 1970, 'Use of the scalar Preisach model in 3D finite element analysis for C-core inductor design', IEEE International Magnetics Conference, IEEE International Magnetics Conference, IEEE.
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A simulation is presented that uses finite element analysis (FEA) with a scalar Presach model of hysteresis and an improved core loss model to predict the behavior of a C-core inductor excited by a current source. Results of field analysis, inductor performance and core loss calculations are discussed.