Bakker, JM, Langford, SJ, Latter, MJ, Lee, KA & Woodward, CP 2005, 'Template-Directed Assembly of a Macrocyclic Porphyrin Tetramer Using Olefin Metathesis', Australian Journal of Chemistry, vol. 58, no. 11, pp. 757-757.
View/Download from: Publisher's site
View description>>
A macrocyclic porphyrin tetramer was prepared in 52% yield by olefin metathesis employing a 5,10,15,20-tetrapyridylporphyrin template.
Belousoff, MJ, Langford, SJ, Latter, MJ & Lau, VL 2005, '4′,4′′,5′,5′′-Tetranitro-2,3:11,12-dibenzo- 1,4,7,10,13,16-hexaoxacyclooctadeca-2,11-diene acetonitrile solvate monohydrate', Acta Crystallographica Section E Structure Reports Online, vol. 61, no. 10, pp. o3283-o3284.
View/Download from: Publisher's site
Cheah, IK, Langford, SJ & Latter, MJ 2005, 'Concept Transfer—From Genetic Instruction to Molecular Logic', Supramolecular Chemistry, vol. 17, no. 1-2, pp. 121-128.
View/Download from: Publisher's site
Chowdhury, H, Xu, XD, Huynh, P & Cortie, MB 2005, 'Radiative heat transfer across glass coated with gold nano-particles', JOURNAL OF SOLAR ENERGY ENGINEERING-TRANSACTIONS OF THE ASME, vol. 127, no. 1, pp. 70-75.
View/Download from: Publisher's site
View description>>
Solar glazing based on reflective or absorptive coatings of noble metals or dielectric compounds respectively is well-known. However the use of gold nano-particles in an absorptive role has hardly been considered. The performance of such coatings was ass
Cortie, MB, Maaroof, AI & Smith, GB 2005, 'Electrochemical capacitance of mesoporous gold', GOLD BULLETIN, vol. 38, no. 1, pp. 14-22.
View description>>
The surfaces of nanoscale gold particles and components are oxide-free under normal ambient conditions. This unusual attribute permits the exploration of microstructures and functionalities that would not be feasible for less noble metals. Here we consider the electrochemical properties of mesoporous gold sponges, prepared by de-alloying an AuAl2_precursor. The sponges have a high specific surface area, with an average pore diameter of 12_nm, but are prone to sinter. They may be prepared in bulk, or, more usefully, as coatings. Their electrochemical capacitance divided by their nominal surface area is high and, at a cell voltage of 0.6_V, reaches 100_mF/cm2 for bulk samples and 2_mF/cm2 for coatings. This is up to a thousand times greater than the 50_to 100_?F/cm2 exhibited by a planar gold surface.
Cortie, MB, Zareie, MH, Ekanayake, SR & Ford, MJ 2005, 'Conduction, storage, and leakage in particle-on-SAM nanocapacitors', IEEE TRANSACTIONS ON NANOTECHNOLOGY, vol. 4, no. 4, pp. 406-414.
View/Download from: Publisher's site
View description>>
Individual gold nanoparticles exhibit discrete capacitances of the order of 1 aF, and they can be tethered to a conductive substrate using a bi-functional monolayer of a suitable organic molecule. However the conduction, retention and leakage of charge by such an attached 'nanocapacitor' will be an important issue in any practical application of this concept. Here we investigate the electrical properties of the particles using a combination of scanning tunneling spectroscopy and numerical modeling based on equalizing Wentzel-Kramers-Brillouin style tunneling currents. Application of the model provides the voltage division across the structure, and, together, with an estimate of the capacitance of the particle, provides an indication of likely stored charge and energy and its decay. The methodology was tested with I-V data measured for an Au{111}-α, α'-p-xylyldithiol-Au nanoparticle system in air. About 25 eV can be stored on the nanoparticles using a charging voltage of 3 V, corresponding to up to twenty electrons. However, leakage of the charge will occur by tunneling in approximately 6×10-9 s. Therefore, these nanocapacitors would discharge completely in any electric circuit slower than about 1.5 GHz. © 2005 IEEE.
Drozdowicz-Tomsia, K, Goldys, EM, Motlan, M, Zareie, H & Phillips, MR 2005, 'Growth-temperature-dependent cathodoluminescence properties of GaSb/GaAs quantum-dot multilayer structures', APPLIED PHYSICS LETTERS, vol. 86, no. 17, pp. 1-3.
View/Download from: Publisher's site
View description>>
Multilayer GaSb/GaAs quantum-dot (QD) structures grown by atmospheric-pressure metalorganic chemical vapor deposition on semi-insulating GaAs (100) substrates with varying growth temperature of the confinement layers are studied by the cathodoluminescence (CL). Two main features assigned to wetting layer and QDs are observed in the CL spectra. Their relative positions strongly depend on the growth conditions of the confinement layers. The highest separation of 270 meV is achieved for GaAs confinement layers grown at 540 °C. © 2005 American Institute of Physics.
Fallon, GD, Langford, SJ & Lau, V-L 2005, 'Synthesis and X-Ray Structure of a Ditopic Ligand for Constructing Crown Ether-Based Metalloassemblies', Molecular Crystals and Liquid Crystals, vol. 440, no. 1, pp. 223-233.
View/Download from: Publisher's site
Ford, MJ, Hoft, RC & McDonagh, A 2005, 'Theoretical study of ethynylbenzene adsorption on Au(111) and implications for a new class of self-assembled monolayer', JOURNAL OF PHYSICAL CHEMISTRY B, vol. 109, no. 43, pp. 20387-20392.
View/Download from: Publisher's site
View description>>
Density functional calculations of the adsorption of ethynylbenzene on the Au(111) surface show that, after cleavage of the C-H bond, the terminal carbon makes a strong covalent bond to the surface. The bond energy is shown to be about 70 kcal·mol-1 with the fcc hollow site being most stable and the molecule oriented perpendicular to the surface. Adsorption without elimination of hydrogen is also possible via a hydrogen 1,2 shift to form a vinylidene surface-bound species, or opening of the C-C triple bond and adsorption through the two carbon atoms in a flat conformation. The reaction energy for formation of the surface-bound vinylidene is estimated to be 5 kcal·mol-1 exothermic relative to the isolated ethynylbenzene and gold substrate. © 2005 American Chemical Society.
Fu, LJ, Liu, H, Li, C, Wu, YP, Rahm, E, Holze, R & Wu, HQ 2005, 'Electrode materials for lithium secondary batteries prepared by sol-gel methods', PROGRESS IN MATERIALS SCIENCE, vol. 50, no. 7, pp. 881-928.
View/Download from: Publisher's site
View description>>
Since the commercialization of lithium secondary batteries in the early of 1990s, their development has been rapid. Nowadays, improving the preparation technology and electrochemical performance of their electrode materials is a major focus in research and development of the materials, power sources and chemistry. Sol-gel methods are a promising way to prepare electrode materials due to their evident advantages over traditional methods, for example, homogeneous mixing at the atomic or molecular level, lower synthesis temperature, shorter heating time, better crystallinity, uniform particle distribution and smaller particle size at nanometer level. In this paper, latest progress in the preparation of electrode materials by sol-gel methods is reviewed, including cathodic ones, e.g., lithium cobalt oxides, lithium nickel oxides, spinel and layered lithium manganese oxides, vanadium oxides and ferrous phosphates, and anodic ones, e.g., tin oxides and titanium oxides. Compared with those prepared by traditional solid-state reaction, the structure stability of the prepared electrode materials and the behavior of lithium intercalation and de-intercalation are much improved. As a result, the prepared products provide better electrochemical performance including reversible capacity, cycling behavior and rate capability. In addition, sol-gel methods can be used to prepare new kinds of electrode materials such as nanowires of LiCoO 2 and nanotubes of V2O5, which cannot be easily created by the traditional methods. Further development and application of sol-gel methods will bring about new and better electrode materials, meaning a great promotion to lithium secondary batteries. © 2005 Elsevier Ltd. All rights reserved.
Godlewski, M, Ivanov, VY, Lusakowska, E, Bozek, R, Miasojedovas, S, Jursenas, S, Kazlauskas, K, Zukauskas, A, Goldys, EM, Phillips, MR, Bottcher, T, Figge, S & Hommel, D 2005, 'Influence of n-type doping on light emission properties of GaN layers and GaN-based quantum well structures', E-MRS 2004 Fall Meeting Symposia C and F, vol. 2, no. 3, pp. 1056-1059.
View/Download from: Publisher's site
View description>>
Effects of n-type doping of GaN epilayers and InGaN/GaN quantum well structures are studied. We evaluate the influence of n-type doping on a structural quality of the samples (using atomic force and scanning electron microscopy), on light emission intensity and on in-plane emission intensity variations. Possible mechanisms responsible for strong enhancement of light emission from doped samples are discussed. © 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Godlewski, M, Phillips, MR, Czernecki, R, Targowski, G, Perlin, P, Leszczynski, M & Figge, S 2005, 'Light emission properties of GaN-based laser diode structures', ACTA PHYSICA POLONICA A, vol. 108, no. 4, pp. 675-680.
View description>>
Cathodoluminescence is applied for evaluation of in-depth and in-plane variations of light emission from two types of GaN-based laser diode structures. We evaluate in-depth properties of the laser diode emission and demonstrate that potential fluctuations still affect emission of laser diodes for e-beam currents above thresholds for a stimulated emission.
Godlewski, M, Yatsunenko, S, Drozdowicz-Tomsia, K, Goldys, EM, Phillips, MR, Klar, PJ & Heimbrodt, W 2005, 'Dynamics of light emission in CdMnS nanoparticles', ACTA PHYSICA POLONICA A, vol. 108, no. 4, pp. 681-688.
View description>>
We demonstrate coexistence of slow and fast components of photoluminescence decay of the Mn²^(+) intra-shell emission in nanoparticles of CdMnS. We explain the observed decrease in PL lifetime of the Mn²^(+) intra-shell transition by high efficiency of spin dependent magnetic interactions between localized spins of Mn²^(+) ions and free carriers. This mechanism is enhanced in nanostructures, but it is also present in bulk samples.
Godlewski, M, Yatsunenko, S, Ivanov, VY, Khachapuridze, A, Swiatek, K, Goldys, EM, Phillips, MR, Klar, PJ & Heimbrodt, W 2005, 'Origin of ultrafast component of photoluminescence decay in nanostructures doped with transition metal or rare-earth ions', ACTA PHYSICA POLONICA A, vol. 107, no. 1, pp. 65-74.
View/Download from: Publisher's site
View description>>
Bulk samples, layers, quantum well, and quantum dot structures of II-Mn-VI samples all show coexistence of slow and fast components of Mn2+ photoluminescence decay. Thus, fast photoluminescence decay cannot be related to low dimensionality of a host material. This also means that the model of the so-called quantum confined atom is incorrect. Based on the results of time-resolved photoluminescence and optically detected magnetic resonance investigations we relate the observed lifetime decrease in Mn2+ intra-shell transition to spin dependent magnetic interactions between localized spins of Mn2+ ions and between Mn2+ ions and spins/magnetic moments of free carriers. The latter mechanism is enhanced in nanostructures.
Guo, YG, Zhu, JG, Watterson, PA & Wu, W 2005, 'Development of a permanent magnet claw pole motor with soft magnetic composite core', Australian Journal of Electrical and Electronics Engineering, vol. 2, no. 1, pp. 21-30.
View/Download from: Publisher's site
View description>>
This paper reports the development of a three-phase permanent magnet claw pole motor with soft magnetic composite stator, taking advantage of the unique properties of the material Advanced design and performance analysis methods were employed, such as the three-dimensional finite element analysis of magnetic fields for parameter calculation and dimension optimisation, rotational core loss models combined with finite element method for core loss prediction, and hybrid thermal model with distributed heat sources for the temperature rise calculation, etc. The design and analyse methods are validated by experiment on the prototype driven by a brushless DC drive scheme. © Institution of Engineers, Australia 2005.
Hogan, CF, Hutchison, JA, Ghiggino, KP, Langford, SJ, Latter, MJ, Lau, V-L & Murali, V 2005, 'A 24-Crown-8 Bearing Naphthalene and Naphthoquinone Chromophores', Supramolecular Chemistry, vol. 17, no. 7, pp. 513-519.
View/Download from: Publisher's site
Huang, ZG, Guo, ZP, Liu, HK & Dou, SX 2005, 'Effect of Ni content on the structural and electrochemical properties of Mg1.9Cu0.1Niχ alloys', Journal of New Materials for Electrochemical Systems, vol. 8, no. 4, pp. 283-289.
View description>>
Mg-based alloys, Mg1.9Cu0.1Niχ (χ = 1.8, 1.9, 2.0, 2.1), were fabricated through high-energy ball milling, and the effects of nickel content on the electrochemical characteristics have been investigated. A high discharge capacity of 490 mAhg-1 was observed for χ = 1.8, compared with 435 mAhg-1 for χ = 2.1. As to capacity degradation, 66.7 % of initial capacity was lost after 15 cycles for χ = 1.8, while only 47.2% for χ = 2.1. Cyclic Voltammograms (CV) indicates that nickel can help maintain redox reaction current and consequently improve the cycle performance. The X-ray mapping analysis indicates that Mg, Ni, and Cu are uniformly distributed in the particles. The O content in the alloy electrodes after 15 cycles decreases with the increase of Ni content in the alloys, suggesting that Ni can efficiently suppress the formation of Mg(OH) 2. The linear polarization curves show that the exchange current density, namely the rate of hydriding/dehydriding, increases from 13 mAg -1 to 133 mAg-1 when the nickel content varies from 1.8 to 2.1. This is also considered as a reason for the observed improved capacity stability. © J. New. Mat. Electrochem. Systems.
Jin Jiang Zhong, Jian Guo Zhu, YouGuang Guo & Zhi Wei Lin 2005, 'A 3-D vector magnetization model with interaction field', IEEE Transactions on Magnetics, vol. 41, no. 5, pp. 1496-1499.
View/Download from: Publisher's site
View description>>
This paper presents a vector model of magnetization based on the three-dimensional (3-D) Stoner-Wohlfarth elemental operator. To account for the magnetic interactions between particles, a phenomenological mean-field approximation is employed. The paper also illustrates the numerical simulation results of the magnetization in 3-D. This model will be useful to simulate the magnetization process of complicated topology flux electromagnetic devices. © 2005 IEEE.
Langford, SJ, Latter, MJ & Beckmann, J 2005, 'Synthesis and characterisation of a bis(silyloxy)tin(IV) porphyrin', Inorganic Chemistry Communications, vol. 8, no. 10, pp. 920-923.
View/Download from: Publisher's site
Lin, ZW, Lu, HW, Zhu, JG, Zhong, JJ, Wang, XL & Ding, SY 2005, 'Vector characterization of soft magnetic materials', Journal of Applied Physics, vol. 97, no. 10, pp. 10R306-10R306.
View/Download from: Publisher's site
View description>>
A three-dimensional (3D) magnetic property testing system has been completed and successfully used to measure 3D hysteresis loci of soft magnetic material. This paper presents the techniques to characterize soft magnetic materials under 3D magnetic excitations in detail. Using three couples of excitation coils controlled by a computer to generate the magnetic fields in three orthogonal axes, various types of flux density loci, such as circular or elliptical rotating vectors of flux density with any given orientations in 3D space, can be obtained. Based on 3D finite element analysis and a comparative study, a sandwich arrangement comprising a sample, guard pieces, and search coils with double-layer structure was proposed. Compared with the conventional surface search coils, this arrangement can significantly improve the accuracy of measurement. The comprehensive calibration process and the experimental results of the 3D hysteresis loci of soft magnetic composite materials are also presented.
Liu, J, Cankurtaran, B, McCredie, G, Ford, MJ, Wieczorek, L & Cortie, MB 2005, 'Investigation of the optical properties of hollow aluminium 'nano-caps'', NANOTECHNOLOGY, vol. 16, no. 12, pp. 3023-3028.
View/Download from: Publisher's site
View description>>
A colloidal suspension of hollow aluminium, cap-shaped nanoparticles ('nano-caps') can be conveniently produced by evaporation of aluminium onto a spin-coated layer of polystyrene nanoparticles (PSNPs), followed by sonication and dissolution of the polymer template. Although ordinary spherical aluminium nanoparticles have a plasmon resonance in the ultra-violet, the 'nano-caps' show plasmon absorption between 700 and 1200 nm due to their geometry. The position of their extinction peaks can be tuned by varying the thickness of the aluminium and the shape of the nano-cap. The optical properties of these shapes were modelled using the discrete dipole approximation method, which confirmed that the 'caps' have very significantly red-shifted absorbance and scattering compared to spheres. This finding suggests that aluminium nano-caps might compete with gold and silver nanoparticles in applications requiring absorption in the near infrared. © 2005 IOP Publishing Ltd.
Liu, J, Maaroof, AI, Wieczorek, L & Cortie, MB 2005, 'Fabrication of Hollow Metal “Nanocaps” and Their Red‐Shifted Optical Absorption Spectra', Advanced Materials, vol. 17, no. 10, pp. 1276-1281.
View/Download from: Publisher's site
View description>>
The optical and infrared radiation (IR) absorption spectra of randomly oriented suspensions of discrete cap-shaped metal nanoparticles were discussed. Nanocaps of gold, silver, aluminum, copper, and chromium were produced and the effect of variations in deposition angle and thickness were analyzed. The nanocaps were fabricated with the application of 200 nm diameter PSPs onto a glass substrates by spin-coating. The results show that the absorption peaks of these nanocaps are strongly red shifted relative to those of solid nanospheres.
Lu, H, Jianguo Zhu & Youguang Guo 2005, 'Development of a slotless tubular linear interior permanent magnet micromotor for robotic applications', IEEE Transactions on Magnetics, vol. 41, no. 10, pp. 3988-3990.
View/Download from: Publisher's site
View description>>
Linear micromotors play a key role in microrobotic systems. They can greatly simplify the drive mechanisms, which is crucial for microsystems. By using permanent magnets, much higher force-to-volume ratio can be obtained than using electromagnets and better drive performance can be achieved. This paper describes the development of a tubular permanent magnet linear motor for the actuation of microrobots. Important design criteria are established by both analytical and numerical methods. The field distribution, the electro-magnetic force, and the stator phase winding inductances are analyzed and predicted by the finite-element analysis taking into account the nonlinear properties and saturation effects of the material. © 2005 IEEE.
Lucas, NT, Hook, JM, McDonagh, AM & Colbran, SB 2005, 'Titanium Dioxide Nanoparticles Functionalized with Pd and W Complexes of a Catecholphosphane Ligand', European Journal of Inorganic Chemistry, vol. 2005, no. 3, pp. 496-503.
View/Download from: Publisher's site
View description>>
AbstractPalladium and tungsten complexes containing the bifunctional ligand 4‐diphenylphosphanylcatechol (L1) have been synthesized. The catecholate functionality strongly binds to titanium dioxide nanoparticles, effectively anchoring the complexes to the TiO2 surface. Solid‐state 31P NMR spectroscopy was used to probe the surface‐bound compounds. Diffuse reflectance infrared spectroscopy also provided data on surface‐bound tungsten carbonyl complexes. Preliminary experiments show that the palladium phosphane complex [PdBr2(L1)2] supported on TiO2 catalyzes the Sonogashira coupling of phenylacetylene with 4‐iodonitrobenzene. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)
Maaroof, AI, Cortie, MB & Smith, GB 2005, 'Optical properties of mesoporous gold films', JOURNAL OF OPTICS A-PURE AND APPLIED OPTICS, vol. 7, no. 7, pp. 303-309.
View/Download from: Publisher's site
View description>>
Mesoporous gold thin films on glass substrates were fabricated by sputtering of AuAl2 precursor films followed by a de-alloying etch. The resulting sponge-like Au films have very high internal surface area due to nanoscale pores and channels. Scattering
Malguth, E, Hoffmann, A, Phillips, M & Gehlhoff, W 2005, 'Fe-Centers in GaN as Candidates for Spintronics Applications', MRS Proceedings, vol. 892.
View/Download from: Publisher's site
View description>>
AbstractThe potential use of Fe doped GaN for spintronics applications requires a complete understanding of the electronic structure of Fe in all of its charge states. To address these issues, a set of 500 µm thick freestanding HVPE grown GaN:Fe crystals with different Fe-concentration levels ranging from 5×1017 to 2×1020 was studied by means of photoluminescence, photoluminescence excitation (PLE) and Fourier transform infrared (FTIR) transmission experiments. The Fe3+/2+ charge transfer (CT) level was determined to be at 2.86 ± 0.01 eV above the valence band maximum considerably lower than the previously reported value of 3.17 ± 0.10 eV. A bound state of the form (Fe2+, hVB) with a binding energy of 50 ± 10 meV has been established as an excited state of Fe3+. FTIR transmission measurements revealed an internal (5E-5T2) transition of Fe2+ around 400 eV which, until now, was believed to be degenerate with the conduction band. Consequently, a second CT band was detected in PLE spectra.
Masens, C, Ford, MJ & Cortie, MB 2005, 'The effect of surface symmetry on the adsorption energetics of SCH3 on gold surfaces studied using Density Functional Theory', SURFACE SCIENCE, vol. 580, no. 1-3, pp. 19-29.
View/Download from: Publisher's site
View description>>
Adsorption of methanethiol onto the three, high symmetry gold surfaces has been studied at the density functional level using a linear combination of atomic orbitals approach. In all three cases the bond energy between the thiolate radical and surface is typical of a covalent bond, and is of the order of 40 kcal mol-1. For the (1 1 1) surface the fcc hollow site is slightly more stable than the bridge site. For the (1 0 0) surfaces the four-fold hollow is clearly the most stable, and for the reconstructed (1 1 0) surface the bridge/edge sites either side of the first layer atoms are preferred. The calculated differences in binding energy between the three surfaces indicate that the thiolate will preferentially bind to the Au(1 1 0) or (1 0 0) before (1 1 1) surface, by about 10 kcal mol-1. The (1 1 0) surface is slightly more favourable than the (1 0 0), although the energy difference is only 3 kcal mol-1. The results suggest the possibility of selectively functionalising the different facets offered by a gold nanoparticle. © 2005 Elsevier B.V. All rights reserved.
Mokkapati, S, Lever, P, Tan, HH, Jagadish, C, McBean, KE & Phillips, MR 2005, 'Controlling the properties of InGaAs quantum dots by selective-area epitaxy', APPLIED PHYSICS LETTERS, vol. 86, no. 11, pp. 1-3.
View/Download from: Publisher's site
View description>>
Selective growth of InGaAs quantum dots on GaAs is reported. It is demonstrated that selective-area epitaxy can be used for in-plane bandgap energy control of quantum dots. Atomic force microscopy and cathodoluminescence are used for characterization of the selectively grown dots. Our results show that the composition, size, and uniformity of dots are determined by the dimensions of the mask used for patterning the substrate. Properties of dots can be selectively tuned by varying the mask dimensions. A single-step growth of a thin InGaAs quantum well and InGaAs quantum dots on the same wafer is demonstrated. By using a single-step growth, dots luminescing at different wavelengths, in the range 1150-1230 nm, in different parts of the same wafer are achieved. © 2005 American Institute of Physics.
Peceros, KE, Xu, XD, Bulcock, SR & Cortie, MB 2005, 'Dipole-dipole plasmon interactions in gold-on-polystyrene composites', JOURNAL OF PHYSICAL CHEMISTRY B, vol. 109, no. 46, pp. 21516-21520.
View/Download from: Publisher's site
View description>>
Red-shifting of the optical absorption spectra of aggregates of gold nanoparticles by dipole-dipole interactions is of considerable interest, both for theoretical reasons and because the phenomenon can be potentially exploited in various applications. A
Sastraruji, T, Jatisatienr, A, Pyne, SG, Ung, AT, Lie, W & Williams, MC 2005, 'Phytochemical studies on Stemona plants: Isolation of stemofoline alkaloids', JOURNAL OF NATURAL PRODUCTS, vol. 68, no. 12, pp. 1763-1767.
View/Download from: Publisher's site
View description>>
Six new stemofoline alkaloids, (2¢R)-hydroxystemofoline (5), (3¢R)-stemofolenol (6), (3¢S)-stemofolenol (7),1¢,2¢-didehydrostemofoline-N-oxide (8), the first C19 stemofoline alkaloid, methylstemofoline (9), and the first glycosidated Stemona alkaloid, stemofolinoside (10), and three known alkaloids, (2¢S)-hydroxystemofoline (2), (11Z)-1¢,2¢-didehydrostemofoline (3), and (11E)-1¢,2¢-didehydrostemofoline (4), have been isolated from a root extract of an unidentified Stemona species. The structure and relative configuration of these new alkaloids have been determined by spectral data interpretation and from semisynthetic studies.
Scott, K, Butcher, A, Wintrebert-Fouquet, M, Chen, PPT, Prince, KE, Timmers, H, Shrestha, SK, Shubina, TV, Ivanov, SV, Wuhrer, R, Phillips, MR & Monemar, B 2005, 'Non-stoichiometry and non-homogeneity in InN', Physica Status Solidi C - Conferences and Critical Reviews, Vol 2, No 7, vol. 2, no. 7, pp. 2263-2266.
View/Download from: Publisher's site
View description>>
It is shown that the wide variation of apparent band-gap observed for thin films nominally referred to as InN is strongly influenced by variations in the nitrogen:indium stoichiometry. InN samples grown by remote plasma enhanced chemical vapour deposition show a change in band-gap between 1.8 and 1.0 eV that is not due to the Moss-Burstein effect, oxygen inclusion or quantum size effects, but for which changes in the growth temperature result in a strong change in stoichiometry. Material non-homogenity and non-stoichiometry appear to be general problems for InN growth. Excess nitrogen can be present at very high levels and indium rich material is also found. This work shows that the extent of the Moss-Burstein effect will have to be reassessed for InN. © 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Scott, K, Butcher, A, Wintrebert-Fouquet, M, Chen, PPT, Wuhrer, R & Phillips, MR 2005, 'Revisiting electrochromism in InN', Physica Status Solidi C - Conferences and Critical Reviews, Vol 2, No 7, vol. 2, no. 7, pp. 2293-2296.
View/Download from: Publisher's site
View description>>
We confirm changes to the band-gap of InN thin films treated in an electrochemical cell in which water electrolysis is evident. Electrical properties of the films were also affected. It is suggested that the change in the film resistivity results from hydrogen incorporation or removal during the electrolysis (dependent on sample polarity). The presence of grain boundaries is believed to enhance the penetration of chemical species into the InN resulting in a greater net change in the observed properties. © 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Spoor, DJ & Zhu, J 2005, 'Intercircuit Faults and Distance Relaying of Dual-Circuit Lines', IEEE Transactions on Power Delivery, vol. 20, no. 3, pp. 1846-1852.
View/Download from: Publisher's site
View description>>
The main sources of error and other difficulties associated with the distance protection of dual-circuit transmission lines are well known. However, the design or selection of protection schemes usually fails to consider some of the more extraordinary faults that do occur. This pape r considers the observed impedances that result from intercircuit faults on a simulated dual-circuit transmission line, where variations in the phasing as well as the impedance ratios have been considered. The simulations performed with the Alternative Transients Program show that intercircuit faults may be undetectable in the instantaneous protection zone depending on the scheme adopted and the impedances of the surrounding network. The observed under-reaching has the potential to lead to a loss of major loads, maloperation of single-pole tripping schemes and even system instabilities based on the critical clearance requirements. © 2005 IEEE.
Spoor, DJ & Zhu, J 2005, 'Intercircuit faults and distance relaying of dual-circuit lines', IEEE TRANSACTIONS ON POWER DELIVERY, vol. 20, no. 3, pp. 1846-1852.
View/Download from: Publisher's site
Tomaszewska-Grzeda, A, Lojkowski, W, Godlewski, M, Yatsunenko, S, Drozdowicz-Tomsia, K, Goldys, EM & Phillips, MR 2005, 'Growth and characterization of ZnO nanoparticles', ACTA PHYSICA POLONICA A, vol. 108, no. 5, pp. 897-902.
View description>>
In this work we evaluate structural and optical properties of ZnO nanoparticles grown by wet chemistry method. Light emission properties of these nanoparticles are studies with cathodoluminescence and microphotoluminescence. Even at the room temperature excitonic emission is well resolved, due to high exciton binding energy of ZnO. Decay kinetics of photoluminescence emisssions and efficiency of inter-nanoparticles energy migration is evaluated from maps of in-plane variations of photoluminescence decay times measured in microphotoluminescence setup
Ung, AT, Pyne, SG, Batenburg-Nguyen, U, Davis, AS, Sherif, A, Bischoff, F & Lesage, ASJ 2005, 'Synthesis and antagonist activities of 4-aryl-substituted conformationally restricted cyclopentenyl and cyclopentanyl-glutamate analogues', TETRAHEDRON, vol. 61, no. 7, pp. 1803-1812.
View/Download from: Publisher's site
View description>>
The conformationally restricted glutamate analogues, 4-aryl-1-amino-2-cyclopentene-1,3-dicarboxylates and their cyclopentane analogues have been prepared in a diastereoselective manner. Biological studies of 12a and 12b indicates that both compounds are modest antagonists at mGluR2.
Wang, GX, Yang, L, Chen, Y, Wang, JZ, Bewlay, S & Liu, HK 2005, 'An investigation of polypyrrole-LiFePO4 composite cathode materials for lithium-ion batteries', Electrochimica Acta, vol. 50, no. 24, pp. 4649-4654.
View/Download from: Publisher's site
View description>>
A series of polypyrrole-LiFePO4 (PPy-LiFePO4) composites were synthesised by polymerising pyrrole monomers on the surface of LiFePO4 particles. AC impedance measurements show that the coating of polypyrrole significantly decreases the charge-transfer resistance of LiFePO4 electrodes. The electrochemical reactivity of polypyrrole and PPy-LiFePO4 composites for lithium insertion and extraction was examined by charge/discharge testing. The PPy-LiFePO4 composite electrodes demonstrated an increased reversible capacity and better cyclability, compared to the bare LiFePO4 electrode. © 2005 Elsevier Ltd. All rights reserved.
White, RE, Thomas, PS, Phillips, MR & Wuhrer, R 2005, 'A DSC study of the effect of lead pigments on the drying of cold pressed linseed oil', JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY, vol. 80, no. 1, pp. 237-239.
View/Download from: Publisher's site
View description>>
Cold pressed linseed oil and paints prepared using the inorganic pigments; lead white and red lead, were characterized using non-isothermal differential scanning calorimetry (DSC) in an air atmosphere to determine the effect of the pigment on the oxidative polymerisation of the drying oil medium. For each paint sample, the onset temperature for oxidation was reduced from 166°C to the range 50 to 60°C when a heating rate of 5 K min-1 was used. In order to determine the rate of drying, the non-isothermal experiments were carried out using a range of heating rates. A change in the mechanism oxidative polymerization was observed as the heating rate was increased. © 2005 Akadémiai Kiadó, Budapest.
Williams, DBG & Lawton, M 2005, 'Aluminium triflate: a remarkable Lewis acid catalyst for the ring opening of epoxides by alcohols', Organic & Biomolecular Chemistry, vol. 3, no. 18, pp. 3269-3269.
View/Download from: Publisher's site
Williams, DBG, Caddy, J & Blann, K 2005, 'Highly functionalised cyclobutanols via samarium(II) iodide-induced pinacol cyclisations of carbohydrate-derived 1,4-diketones', Carbohydrate Research, vol. 340, no. 7, pp. 1301-1309.
View/Download from: Publisher's site
Wojcik, A, Kopalko, K, Godlewski, M, Lusakowska, E, Guziewicz, E, Minikayev, R, Paszkowicz, W, Swiatek, K, Klepka, M, Jakiela, R, Kiecana, M, Sawicki, M, Dybko, K & Phillips, MR 2005, 'Thin films of ZnO and ZnMnO by atomic layer epitaxy', OPTICA APPLICATA, vol. 35, no. 3, pp. 413-417.
View description>>
We discuss properties of thin films of ZnO and ZnMnO grown with atomic layer epitaxy using new, organic zinc and manganese precursors. Several characterization techniques, including X-ray diffraction, atomic force microscopy, scanning electron microscopy, cathodoluminescence, superconducting quantum interfernece device (SQUID) and electron spin resonance, show good topography of the films and their advantageous optical and magnetic properties.
Xu, XB, Zhang, L, Leng, X, Ding, SY, Liu, HK, Wang, XL, Dou, SX, Lin, ZW & Zhu, JG 2005, 'Third harmonics due to surface barrier in high-temperature superconductor', Journal of Applied Physics, vol. 97, no. 10, pp. 10B105-10B105.
View/Download from: Publisher's site
View description>>
The influence of surface barrier on the third harmonics ac susceptibility (χ3) is studied numerically. The surface barrier is described by a critical current density in surfaces which are higher than the inside one. The model can act as the critical state one, the flux creep one, or the flux flow one when temperature (or field) changes. The numerical results based on the model are more close to the popular experimental data probing the harmonics as a function of temperature (or field). Besides, the surface barrier will lead to new peaks in the real and imaginary parts of the third harmonics, which are the finger signature of the surface barrier. Comparison of the peaks with those of the real part of elemental harmonic shows that they are located at the same temperature where dips in χ′ caused by the surface barrier occur, which is in well agreement with experiments.
Xu, XD, Cortie, MB & Stevens, M 2005, 'Effect of glass pre-treatment on the nucleation of semi-transparent gold coatings', MATERIALS CHEMISTRY AND PHYSICS, vol. 94, no. 2-3, pp. 266-274.
View/Download from: Publisher's site
View description>>
Coatings of gold nanoparticles with a uniform film texture and a neutral blue hue may be applied to glass by an aqueous process and such coatings have recently been proposed for architectural applications. Here, we show that the optical transmission spec
Yan, EB, Unthank, JK, Castillo-Melendez, M, Miller, SL, Langford, SJ & Walker, DW 2005, 'Novel method for in vivo hydroxyl radical measurement by microdialysis in fetal sheep brain in utero', Journal of Applied Physiology, vol. 98, no. 6, pp. 2304-2310.
View/Download from: Publisher's site
View description>>
Hydroxyl radical (·OH) is a reactive oxygen species produced during severe hypoxia, asphyxia, or ischemia that can cause cell death resulting in brain damage. Generation of ·OH may occur in the fetal brain during asphyxia in utero. The very short half-life of ·OH requires use of trapping agents such as salicylic acid or phenylalanine for detection, but their hydroxylated derivatives are either unstable, produced endogenously, or difficult to measure in the small volume of microdialysis samples. In the present study, we used terephthalic acid (TA), hydroxylation of which yields a stable and highly fluorometric isomer (excitation, 326 nm; emission, 432 nm). In vitro studies using ·OH generated by the Fenton reaction showed that hydroxylated TA formed quickly (<10 s), was resistant to bleaching (<5% change in fluorescence), and permitted detection of <0.5 pmol ·OH. In vivo studies were performed in fetal sheep using microdialysis probes implanted into the parasagittal cortex. The probe was perfused at 2 μl/min with artificial cerebrospinal fluid containing 5 mM TA, and samples were collected every 30 min. Fluorescence measured in 10 μl of dialysate was significantly greater than in the efflux from probes perfused without TA. High-performance liquid chromotography analysis showed that the fluorescence in dialysis samples was entirely due to hydroxylation of TA. Thus this study shows that it is possible to use TA as a trapping agent for detecting low concentrations of ·OH both in vitro and in vivo and that low concentrations of ·OH are present in fetal brain tissue and fluctuate with time.
Yong, SR, Williams, MC, Pyne, SG, Ung, AT, Skelton, BW, White, AH & Turner, P 2005, 'Synthesis of 2-azaspiro[4.4]nonan-1-ones via phosphine-catalysed [3+2]-cycloadditions', TETRAHEDRON, vol. 61, no. 34, pp. 8120-8129.
View/Download from: Publisher's site
View description>>
The phosphine-catalyzed [3+2]-cycloaddition of the 2-methylene ?-lactams 4 and 5 and the acrylate 6 with the ylides derived from the ethyl ester, the amide or the chiral camphor sultam derivative of 2-butynoic acid (7ac) give directly, or indirectly after reductive cyclization, spiro-heterocyclic products. The acid 32 underwent Curtius rearrangement and then acid hydrolysis to give two novel spiro-cyclic ketones, 41 and 42.
YouGuang Guo, Jian Guo Zhu & Wu, W 2005, 'Thermal analysis of soft magnetic composite motors using a hybrid model with distributed heat sources', IEEE Transactions on Magnetics, vol. 41, no. 6, pp. 2124-2128.
View/Download from: Publisher's site
View description>>
This paper presents a hybrid thermal model with distributed heat sources for thermal analysis of soft magnetic composite (SMC) motors. The model uses a combination of lumped and distributed thermal parameters, which can be obtained from motor dimensions
YouGuang Guo, Jian Guo Zhu, Zhi Wei Lin & Jin Jiang Zhong 2005, 'Measurement and modeling of core losses of soft magnetic composites under 3-D magnetic excitations in rotating motors', IEEE Transactions on Magnetics, vol. 41, no. 10, pp. 3925-3927.
View/Download from: Publisher's site
View description>>
Soft magnetic composite (SMC) materials are especially suitable for construction of low-cost high-performance motors with three-dimensional (3-D) magnetic fields. The 3-D finite-element analysis (FEA) conducted in the design of a claw pole transverse flu
Zhang, L, Xu, XB, Ding, SY, Zheng, MH, Xiao, L, Ren, HT, Jiao, YL, Wang, XL, Lin, ZW & Zhu, JG 2005, 'Effect of doping on flux pinning of GdBa2Cu3O7−y', Journal of Applied Physics, vol. 97, no. 10, pp. 10B101-10B101.
View/Download from: Publisher's site
View description>>
Cylindrical single grains of GdBa2Cu3Oy (Gd-123) with a diameter of 25mm were successfully fabricated by melt-texture growth (MTG) process in air to study the influence of different starting powders on flux pinning. Measurements of the magnetic critical current density (Jc) showed that it was possible to fabricate large Gd-123 single grain with a high Jc at high temperatures and fields by means of properly controlling the starting powders of Gd2O3, BaCO3, and CuO before the MTG process.
Zhong, JJ, Zhu, JG, Lin, ZW, Guo, YG & Sievert, JD 2005, 'Improved measurement of magnetic properties with 3D magnetic fluxes', Journal of Magnetism and Magnetic Materials, vol. 290-291, no. 2, pp. 1567-1570.
View/Download from: Publisher's site
View description>>
This paper, as a pioneering work, presents measurement techniques to characterize soft magnetic materials in three-dimensional (3D) space. A novel 3D magnetic property tester using cubic sample has been constructed and calibrated. Some phenomena and problems of measurement caused by the imperfect winding and misalignment of coils are analyzed. The correction methods are proposed and employed. The new soft magnetic composite SOMALOY™ 500 is investigated. © 2004 Elsevier B.V. All rights reserved.
Abell, T, Houthoofd, K, Iacopi, F, Grobet, P & Maex, K 1970, 'Solid state MAS NMR spectroscopic characterization of plasma damage and UV modification of low k dielectric films', Materials, Technology and Reliability of Advanced Interconnects-2005, Symposium on Materials, Technology and Reliability of Advanced Interconnects held at the 2005 MRS Spring Meeting, MATERIALS RESEARCH SOC, San Francisco, CA, pp. 35-40.
Asselberghs, I, McDonagh, A, Ward, MD, McCleverty, J, Coe, BJ, Persoons, A & Clays, K 1970, 'Switching of the first hyperpolarisability', Linear and Nonlinear Optics of Organic Materials V, Optics & Photonics 2005, SPIE, USA, pp. 215-223.
View/Download from: Publisher's site
View description>>
Second-order nonlinear optical properties of organic and inorganic materials have been widely investigated. However, it becomes more important to be able to switch the molecules from an 'on' state to an 'off' state, or vise versa. Several switching schemes can be thought of. We will focus our attention to alter the donor properties of metalorganic compounds. Therefore, we will oxidize the metal center of the compound chemically. Since it is more interesting to be able to electrochemically switch the metal center, we developed a combined electrochemistry/hyper-Rayleigh scattering cell to perform in-situ electrochemical switching of the hyper-Rayleigh response
Bruynseraede, C, Tokei, Z, Iacopi, F, Beyer, GP, Michelon, J, Maex, K & IEEE 1970, 'The impact of scaling on interconnect reliability', 2005 IEEE INTERNATIONAL RELIABILITY PHYSICS SYMPOSIUM PROCEEDINGS - 43RD ANNUAL, 43rd Annual IEEE International Reliability Physics Symposium, IEEE, San Jose, CA, pp. 7-17.
View/Download from: Publisher's site
Butcher, KSA, Ferris, JM, Phillips, MR, Wintrebert-Fouquet, M, Wah, JWJ, Jovanovic, N, Vyverman, W & Chepurnov, V 1970, 'A luminescence study of porous diatoms', MATERIALS SCIENCE & ENGINEERING C-BIOMIMETIC AND SUPRAMOLECULAR SYSTEMS, Symposium on Current Trends in Nanoscience - From Materials to Applications held at the EMRS Spring Meeting, Elsevier, Strasbourg, France, pp. 658-663.
View/Download from: Publisher's site
View description>>
The cathodoluminescent and photoluminescent properties of the nanoporous silica frustules of various diatom strains and of natural diatom samples are presented. The spectra are observed to be similar to that of pure silica glass and the phenology is therefore believed to also be somewhat similar. A strong UV-blue luminescence peak is commonly observed as well as a yellow peak at 2.15 eV. For the more heavily silicified field-collected freshwater benthic samples, a strong red peak at 1.95 eV is also observed. The 2.15 eV peak is also more strongly evident for the field-collected samples. The UV-blue peak is related to common silica defect structure but cathodoluminescent microanalysis shows that this emission is highly localized in the diatom samples. © 2005 Elsevier B.V. All rights reserved.
Chandru, R & Zhu, JG 1970, 'Sensorless rotor position detection using differential high frequency phase current method', Proceedings of the International Conference on Power Electronics and Drive Systems, pp. 355-359.
View description>>
A new sensorless detection scheme is proposed in this paper. This detection scheme is based on a new concept of high frequency small-signal phase inductance (Lss) of Permanent Magnet Synchronous Motor (PMSM), as detailed in this paper. The Lss of a Soft Magnetic Composite (SMC) motor was mapped in the experiment and the results were used to build a high frequency SIMULINK model for the simulation of a new sensorless rotor detection scheme. © 2005 IEEE.
Coleman, VA, Tan, HH, Jagadish, C, Kucheyev, O, Zou, J & Phillips, MR 1970, 'Towards p-type doping of ZnO by ion implantation', 2005 IEEE LEOS Annual Meeting Conference Proceedings, 2005 IEEE LEOS Annual Meeting, IEEE, pp. 862-863.
View/Download from: Publisher's site
View description>>
The thermal stability of ion implanted ZnO was investigated. Heavily damaged ZnO decomposes with thermal treatment. This result has significant implications for ion implants into ZnO for p-type doping, and subsequent thermal treatments for activation. © 2005 IEEE.
Coleman, VA, Tan, HH, Jagadish, C, Kucheyev, SO, Phillips, MR & Zou, J 1970, 'Towards p-type doping of ZnO by ion implantation', Materials Research Society Symposium Proceedings, Symposium on Progress in Compound Semiconductor Materials IV held at the 2004 MRS Fall Meeting, MATERIALS RESEARCH SOC, Boston, MA, pp. 361-366.
View description>>
Zinc oxide is a very attractive material for a range of optoelectronic devices including blue light-emitting diodes and laser diodes. Though n-type doping has been successfully achieved, p-type doing of ZnO is still a challenge that must be overcome before p-n junction devices can be realized. Ion implantation is widely used in the microelectronics industry for selective area doping and device isolation. Understanding damage accumulation and recrystallization processes is important for achieving selective area doping. In this study, As (potential p-type dopant) ion implantation and annealing studies were carried out. ZnO samples were implanted with high dose (1.4 × 1017 ions/cm2) 300 keV As ions at room temperature. Furnace annealing of samples in the range of 900°C to 1200°C was employed to achieve recrystallization of amorphous layers and electrical activation of the dopant. Rutherford backscattering/channeling spectrometry, transmission electron microscopy and cathodolumiescence spectroscopy were used to monitor damage accumulation and annihilation behavior in ZnO. Results of this study have significant implications for p-type doing of ZnO by ion implantation. © 2005 Materials Research Society.
Coleman, VA, Tan, HH, Jagadish, C, Kucheyev, SO, Zou, J & Phillips, MR 1970, 'Towards p-type doping of ZnO by ion implantation', 2005 IEEE LEOS Annual Meeting Conference Proceedings (LEOS), 18th Annual Meeting of the IEEE-Lasers-and-Electro-Optical-Society, IEEE, Sydney, AUSTRALIA, pp. 845-846.
Cortie, M, Xu, XD, Chowdhury, H, Zareie, H & Smith, G 1970, 'Plasmonic heating of gold nanoparticles and its exploitation', Smart Structures, Devices, and Systems II, Pt 1 and 2, Conference on Smart Structures, Devices, and Systems II, SPIE, Sydney, Australia, pp. 565-573.
View/Download from: Publisher's site
View description>>
Nanoscale particles of metals such as gold can interact with light by means of a plasmon resonance, even. though they are much smaller than the wavelengths of visible light. The proportions of light that are absorbed and scattered vary with wavelength. A
Cortie, MB, Zareie, H, Liu, JQ, Muller, KH & Ford, MJ 1970, 'Modelling and verification of the electrical properties of organic dielectric monolayers in capacitive configurations', SMART STRUCTURES, DEVICES, AND SYSTEMS II, PT 1 AND 2, Conference on Smart Structures, Devices, and Systems II, International Society for Optical Engineering (SPIE), Sydney, Australia, pp. 316-322.
View/Download from: Publisher's site
View description>>
The possible role of self-assembled monolayers (SAMs) as the dielectric component of nanoscale capacitors is considered. SAMs of two rather different molecules, α,α-p-xylyldithiol ('XYL') and dodecanedithiol ('C12') were produced on a gold {111} substrate, and characterized with respect to their conductivity. The data were fitted with a double tunnel barrier model, in which the two SAMs are primarily differentiated by barrier height and thickness with that of XYL having a thickness of 1.0 nm and a barrier height of 0.78 eV compared to 1.69 nm and 1.39 eV for C12. The remaining parameters of the model were determined by Monte Carlo optimization. Assuming perfect connection of top and bottom electrodes, the leakage current through the XYL at 1 volt is calculated to be 1.4×105 A/cm2, compared to 2.7×104 A/cm2 through C12. These values are not as low as can be obtained with SiO2 of the same thickness. However, SAMs are readily and precisely produced by simple, low temperature processes, a factor which may allow them a niche in the future.
Godlewski, M, Phillips, MR, Czernecki, R, Targowski, G, Perlin, P, Leszczyński, M, Figge, S & Hommel, D 1970, 'Light emission properties of GaN-based laser diode structures', Acta Physica Polonica A, pp. 675-680.
View/Download from: Publisher's site
View description>>
Cathodoluminescence is applied for evaluation of in-depth and in-plane variations of light emission from two types of GaN-based laser diode structures. We evaluate in-depth properties of the laser diode emission and demonstrate that potential fluctuations still affect emission of laser diodes for e-beam currents above thresholds for a stimulated emission.
Godlewski, M, Yatsunenko, S, Drozdowicz-Tomsia, K, Goldys, EM, Phillips, MR, Klar, PJ & Heimbrodt, W 1970, 'Dynamics of Light Emission in CdMnS Nanoparticles', Acta Physica Polonica A, Institute of Physics, Polish Academy of Sciences, pp. 681-688.
View/Download from: Publisher's site
View description>>
We demonstrate coexistence of slow and fast components of photoluminescence decay of the Mn2+ intra-shell emission in nanoparticles of CdMnS. We explain the observed decrease in PL lifetime of the Mn2+ intra-shell transition by high efficiency of spin dependent magnetic interactions between localized spins of Mn2+ ions and free carriers. This mechanism is enhanced in nanostructures, but it is also present in bulk samples.
Guo, Y, Zhu, J & Lu, H 1970, 'Design and Analysis of a Permanent Magnet Claw Pole/Transverse Flux Motor with Soft Magnetic Composite Core', Proceedings of the 6th IEEE International Conference on Power Electronics and Drive Systems, IEEE International Conference on Power Electronics and Drive Systems, IEEE, Kuala Lumpur, Malaysia, pp. 1413-1418.
View description>>
This paper presents the design and analysis of a claw pole/transverse flux motor (CPTFM) with soft magnetic composite (SMC) core and permanent magnet flux-concentrating rotor. Three-dimensional magnetic field finite element analysis is conducted to accurately calculate key motor parameters such as winding flux, back electromotive force, winding inductance, and core loss. Equivalent electric circuit is derived under optimum brushless DC control condition for motor performance prediction, and computer search techniques are applied for design optimization. All these computations and analyses have been implemented in a commercial software ANSYS for development of the SMC CPTFM prototype.
Guo, Y, Zhu, J, Lu, H, Chandru, R, Wang, S & Jin, J 1970, 'Determination of Winding Inductance in a Claw Pole Permanent Magnet Motor with Soft Magnetic Composite Core', Proceedings of Australasian Universities Power Engineering Conference, Australasian Universities Power Engineering Conference, The University of Tasmania, Hobart, Australia, pp. 491-496.
Guo, YG, Zhu, JG, Zhong, JJ & Lin, ZW 1970, 'Measurement and modelling of core losses of soft magnetic composites under 3D magnetic excitations in rotating motors', INTERMAG ASIA 2005: Digests of the IEEE International Magnetics Conference, p. 51.
View/Download from: Publisher's site
Haiwei Lu & Jianguo Zhu 1970, 'A study on characteristics of electromagnetic and piezoelectric micro actuators', IEEE International Conference on Mechatronics, 2005. ICM '05., 2005 IEEE International Conference on Mechatronics, IEEE, Taipei, TAIWAN, pp. 591-+.
View/Download from: Publisher's site
Haiwei Lu, Jianguo Zhu & Youguang Guo 1970, 'A Permanent Magnet Linear Motor for Micro Robots', 2005 International Conference on Power Electronics and Drives Systems, 2005 International Conference on Power Electronics and Drives Systems, IEEE, Kuala Lumper, Malaysia, pp. 590-595.
View/Download from: Publisher's site
Haiwei Lu, Jianguo Zhu & Youguang Guo 1970, 'Development of a slotless tubular linear interior permanent magnet micro motor for robotic applications', INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 2005., INTERMAG Asia 2005: Digest of the IEEE International Magnetics Conference, IEEE, p. 105.
View/Download from: Publisher's site
Hoofman, RJOM, Verheijden, GJAM, Michelon, J, Iacopi, F, Travaly, Y, Baklanov, MR, Tokei, Z & Beyer, GP 1970, 'Challenges in the implementation of low-k dielectrics in the back-end of line', MICROELECTRONIC ENGINEERING, 14th Biennial Conference on Insulating Films on Semiconductors, ELSEVIER, Univ Leuven, Dept Psychol, Louvain, BELGIUM, pp. 337-344.
View/Download from: Publisher's site
Iacopi, F, Brongersma, SH, Mazurenko, A, Struyf, H, Mannaert, G, Travaly, Y, Maznev, A, Abell, TJ, Tower, J, Maex, K & IEEE 1970, 'Surface Acoustic Waves as a technique for in-line detection of processing damage to low-k dielectrics', Proceedings of the IEEE 2005 International Interconnect Technology Conference, IEEE International InterconnectTechnology Conference 2005, IEEE, Burlingame, CA, pp. 217-219.
View/Download from: Publisher's site
Iyer, NPR & Jianguo Zhu 1970, 'Modeling and Simulation of A Six Step Discontinuous Current Mode Inverter Fed Permanent Magnet Synchronous Motor Drive Using SIMULINK', 2005 International Conference on Power Electronics and Drives Systems, 2005 International Conference on Power Electronics and Drives Systems, IEEE, pp. 1056-1061.
View/Download from: Publisher's site
View description>>
This manuscript describes modelling of a six step discontinuous current mode inverter fed PMSM drive using SIMULINK. The dq-axis voltage-current and torque relation in terms of machine parameters are used to develop the SIMULINK model. A six step 120 degree mode inverter model is newly developed using SIMULINK. Performance test and measurement were conducted on Lybotec six step discontinuous current inverter fed PMSM drive at no load in the laboratory. These values are used in this open loop model. Simulation results for phase advance angle of π/6 and π/4 are given and compared with experimental results. © 2005 IEEE.
Jianguo Zhu, Youguang Guo, Zhiwei Lin & Jinjiang Zhong 1970, 'Measurement and modeling of SMC materials under vector magnetizations', 2005 International Conference on Electrical Machines and Systems, Proceedings of the Eighth International Conference on Electrical Machines and Systems, IEEE, Nanjing, China, pp. 2354-2359.
View/Download from: Publisher's site
View description>>
In a rotating electrical machine, the local flux density loci could be very complex, e.g. alternating, circularly or elliptically rotating in a plane tilted from any coordinate axis, or even an irregular loop in a three-dimensional space. Different magnetization patterns have very different effects on the machine performance such as core losses, which should be properly taken into account in the design and application of electrical machines. This paper presents the measurement and modeling of the magnetic properties of soft magnetic composite (SMC) materials under various vector magnetizations, and the approach to predicting core losses in electrical machines with SMC cores.
Li, AH, Liu, HK, Ionescu, M, Wang, XL, Dou, SX, Collings, EW, Sumption, MD, Bhatia, M, Lin, ZW & Zhu, JG 1970, 'Improvement of critical current density and thermally assisted individual vortex depinning in pulsed-laser-deposited YBa2Cu3O7−δ thin films on SrTiO3 (100) substrate with surface modification by Ag nanodots', Journal of Applied Physics, 49th Annual Conference on Magnetism and Magnetic Materials, AIP Publishing, Jacksonville, FL, pp. 10B107-10B107.
View/Download from: Publisher's site
View description>>
Y Ba 2 Cu 3 O 7 films were fabricated by pulsed laser deposition on SrTiO3 (100) single-crystal substrates whose surfaces were modified by the introduction of Ag nanodots. The critical current density (Jc) was found to increase with the number of Ag shots. Zero-field magnetic Jc0 at 77K increased from 8×105 up to 3.5×106A∕cm2 as the number of Ag shots increased from 0 to over 150 times. Microstructure investigations indicated that the crystallinity and the ab alignment gradually improved as the number of Ag nanodots increased. Thermally activated depinning of individual vortices is suggested responsible for a field-independent Jc plateau.
Maex, K, Brongersma, SH, Iacopi, F, Vanstreels, K, Travaly, Y, Baklanov, M, D'Haen, J & Beyer, G 1970, 'Aggressive scaling of Cu/low k: impact on metrology', Characterization and Metrology for ULSI Technology 2005, 5th Conference on Characterization and Metrology for ULSI Technology, AMER INST PHYSICS, Richardson, TX, pp. 475-481.
McNaughton, D, Lim, J, Hammer, L, Langford, SJ, Collie, J & Wood, BR 1970, 'Raman spectroscopy and imaging of whole functional cells', SPIE Proceedings, Smart Materials, Nano-, and Micro-Smart Systems, SPIE.
View/Download from: Publisher's site
Mokkapati, S, Wong-Leung, J, Tan, HH, Jagadish, C, McBean, KE & Phillips, MR 1970, 'Controlled nucleation of InAs/GaAs and InGaAs/GaAs quantum dots for optoelectronic device integration', 5th IEEE Conference on Nanotechnology, 2005., 5th IEEE Conference on Nanotechnology, 2005., IEEE, pp. 411-413.
View/Download from: Publisher's site
View description>>
We demonstrate that InAs and InGaAs quantum dots can be grown selectively in specific regions of GaAs substrates using selective-area MOCVD. Growth parameters can be controlled to obtain high density (∼1010/ cm2) of defect free quantum dots. Emission spectra from these selectively grown dots are presented and are comparable in linewidth to that from dots grown on unpatterned substrates. We propose that this growth scheme can be used for fabrication of quantum dot lasers integrated with waveguides. ©2005 IEEE.
Phillips, MR & Morgan, SW 1970, 'Direct Comparison of Various Gaseous Secondary Electron Detectors in the Variable Pressure Scanning Electron Microscope', Microscopy and Microanalysis, Microscopy and Microanalysis, Oxford University Press (OUP), Honolulu, Hawaii, pp. 398-399.
View/Download from: Publisher's site
View description>>
The conventional Everhart-Thornely scintillation-photomultiplier secondary electron (SE) detector cannot function at elevated pressures due to the high voltage (~ +12kV) involved in its operation. As a result, SE imaging in the variable pressure scanning electron microscope (VPSEM) has required the development of a new generation of SE detectors that operate under low vacuum conditions. To date, three different methods have been devised to measure the secondary electron (SE) emission signal in a VPSEM. Each of these approaches involves the excitation of the chamber gas by the placement of a low voltage (< +1000V) positively biased electrode in the vicinity of the specimen. A SE image can be obtained by measuring the current induced in either the positive electrode (the gaseous secondary electron detector) or the grounded stage (the ion current detector) or via a photomultiplier that detects light emission from the gas (the gas luminescence detector). In this work, the performance of each of these three low vacuum SE detector types has been compared under identical operating conditions using a Zeiss Supra 55VPSEM and FEI XL30 ESEM.
Richard, O, Iacopi, F, Tokei, Z & Bender, H 1970, 'Damage layer in silica-based low-k material induced by the patterning plasma process studied by energy-filtered TEM', Microscopy of Semiconducting Materials, 14th Conference on Microscopy of Semiconducting Materials, SPRINGER-VERLAG BERLIN, Univ Oxford, Oxford, ENGLAND, pp. 347-350.
Smith, G, Cortie, MB & Maaroof, AI 1970, 'The apparent optical indices of spongy nanoporous gold', Proceedings of the 16th National Congress of the Australian Institute of Physics, National Congress of the AIP, Australian Institute of Physics, Canberra, pp. 177-180.
View description>>
Very thin spongy nanoporous gold films have a unique nanostructure and hence unusual properties. Our interest in these materials is also due to their wide range of potential application (1,2). An optical study for such nanostructured films is of fundamental interest for understanding how light interacts with such a spongy nanoporous structure. In general the gold either percolates or is very closely packed. This surface plasmons, and surface plasmon resonant effects, are expected to play a key role given the large surface area of metal and the metal backbone of the nanostructure. The ropological complexity of the nano-void network is also expected to be a major influence. The optical response has, for a metal system, quite unusual dispersion relations for the effective complex refractive index components n*, k*. Once these are better understood new optical engineering possibilities arise. We are not aware of any optical studies for spongy metal film nanostructures apart from a brief preliminary report of our own on one such film 93) whose nanstructure was different to the spongy nanoporous films presented here. We check the internal consistency and physical accpetability of the results with a Kramers-Kronig analysis of the spectrumn of n*, k* values, because of their unusual spectral character.
Spoor, DJ, Zhu, J & Nichols, P 1970, 'Filtering effects of substation secondary circuits on power system traveling wave transients', ICEMS 2005: Proceedings of the Eighth International Conference on Electrical Machines and Systems, Vols 1-3, 8th International Conference on Electrical Machines and Systems (ICEMS 2005), INTERNATIONAL ACADEMIC PUBLISHERS LTD, Nanjing, PEOPLES R CHINA, pp. 2360-2365.
Struyf, H, Hendrickx, D, Van Olmen, J, Iacopi, F, Richard, O, Travaly, Y, Van Hove, M, Boullart, W, Vanhaelemeersch, S & IEEE 1970, 'Low-damage damascene patterning of SiOC(H) low-k dielectrics', Proceedings of the IEEE 2005 International Interconnect Technology Conference, IEEE International InterconnectTechnology Conference 2005, IEEE, Burlingame, CA, pp. 30-32.
View/Download from: Publisher's site
Tomaszewska-Grzȩda, A, Lojkowski, W, Godlewski, M, Yatsunenko, S, Drozdowicz-Tomsia, K, Goldys, EM & Phillips, MR 1970, 'Growth and characterization of ZnO nanoparticles', Acta Physica Polonica A, pp. 897-902.
View/Download from: Publisher's site
View description>>
In this work we evaluate structural and optical properties of ZnO nanoparticles grown by wet chemistry method. Light emission properties of these nanoparticles are studied with cathodoluminescence and micro-photoluminescence. Even at the room temperature excitonic emission is well resolved, due to high exciton binding energy of ZnO. Decay kinetics of photoluminescence emissions and efficiency of inter-nanoparticles energy migration is evaluated from maps of in-plane variations of photoluminescence decay times measured in microphotoluminescence setup.
Wang, S, Qiu, J, Li, Q, Zhu, J & Guo, Y 1970, 'A Parametric Finite Element Analysis Package for Electromagnetic Fields of Electrical Machine', Proceedings of Australasian Universities Power Engineering Conference, Australasian Universities Power Engineering Conference, The University of Tasmania, Hobart, Australia, pp. 82-87.
Wójcik, A, Kopalko, K, Godlewski, M, Łusakowska, E, Guziewicz, E, Minikayev, R, Paszkowicz, W, Świa̧tek, K, Klepka, M, Jakieła, R, Kiecana, M, Sawicki, M, Dybko, K & Phillips, MR 1970, 'Thin films of ZnO and ZnMnO by atomic layer epitaxy', Optica Applicata, pp. 413-418.
View description>>
We discuss properties of thin films of ZnO and ZnMnO grown with atomic layer epitaxy using new, organic zinc and manganese precursors. Several characterization techniques, including X-ray diffraction, atomic force microscopy, scanning electron microscopy, cathodoluminescence, superconducting quantum interfernece device (SQUID) and electron spin resonance, show good topography of the films and their advantageous optical and magnetic properties.
Wuhrer, R, Huggett, P, Moran, K, Phillips, MR & Ben-Nissan, B 1970, 'EBSD and XRM of Phases in Vacuum Cast Composite Alloys', Microscopy and Microanalysis, Microscopy and Microanalysis, Oxford University Press (OUP), Honolulu, Hawaii, pp. 1678-1679.
View/Download from: Publisher's site
View description>>
There have been a number f new processes developed that allow the joining of very dissimilar materials such as titanium alloys, wear resistant white irons, cast irons and ceramic materials to ferrous (mild steel) and non-ferrous (aluminium) alloys. These new processes have allowed the development of more complex composite shapes to be produced. However, with any new process development, an undertsnating of the mechanism of bonding is required. through the use of x-ray mapping (XRM), chemical phase imaging as well as electron back scattered diffraction (EBSD) analsysis, very useful information on the mass transport across the interface as well as phase segregation, texture variations and phase distribution within the bond interface can be obtained. results from this investigation on a number of bonded materials are presented and the importance of XRM and EBSD in providing a better understanding of the physical and chemical processes involved in metallurgical bonding/welding of dissimilar materials discussed.
Wuhrer, R, Moran, K, Phillips, MR & Davey, P 1970, 'X-Ray Mapping Using Multiple-EDS and WDS Detectors', Microscopy and Microanalysis, Microscopy and Microanalysis, Oxford University Press (OUP), Honolulu, USA, pp. 1678-1679.
View/Download from: Publisher's site
View description>>
High quality x-ray mapping (XRM) has been used for over 30 years by experienced wavelength dispersive spectroscopy (WDS) operators. Manufacturers have been developing similar techniques using energy dispersive spectroscopy (EDS) over the last 20 years. This has been generally unsuccssful due to a number of problems such as poor computer specifications, cost, time to map and generally poor peak to bacjground ratios (P:B). With improvements in all the above parameters EDS mapping is now gaining in popularity.
Xu, X & Zangari, G 1970, 'Microscopic structure and magnetic behavior of arrays of electrodeposited Ni and Fe nanowires', Journal of Applied Physics, 49th Annual Conference on Magnetism and Magnetic Materials, AIP Publishing, Jacksonville, FL, pp. 10A306-10A306.
View/Download from: Publisher's site
View description>>
Arrays of Ni and Fe nanowires with length up to 6μm were fabricated by voltage controlled electrodeposition within track etched polycarbonate membranes with nominal pore diameter 50nm, using dc or pulsed voltage. Magnetostatic interactions between wires are found to be important in determining magnetic properties and switching processes. Ni arrays switch by quasicoherent rotation when the magnetic field is applied near to the average wire axis, and by curling at large angles. The importance of curling processes increases with wire length, due to the larger demagnetizing field. The properties of Fe wires are dominated by magnetostatic interactions; these arrays switch by curling and no definite easy axis is observed in pulse-plated, amorphous wires.
Ying Yan, Jianguo Zhu, Haiwei Lu, Youguang Guo & Shuhong Wang 1970, 'A PMSM model incorporating structural and saturation saliencies', 2005 International Conference on Electrical Machines and Systems, Proceedings of the Eighth International Conference on Electrical Machines and Systems, IEEE, Nanjing, China, pp. 194-199.
View/Download from: Publisher's site
View description>>
Sensorless permanent magnet synchronous motor (PMSM) drive systems have become very attractive due to their advantages, such as the reduction of hardware complexity and hence the reduced system cost and increased reliability. In order to accurately determine the rotor position required for correct electronic commutation, various methods have been proposed. Among them, the most versatile makes use of the structural and/or magnetic saturation saliencies of the PMSM. This paper presents a non-linear model for PMSMs with the saliencies. The phase inductances of a PMSM are measured and expressed by Fourier series at different rotor positions according to their patterns. The dynamic performance of the PMSM is simulated and compared with that based on a model without considering saliency to verify the effectiveness of the proposed model.
Ying Yan, Jianguo Zhu, Haiwei Lu, Youguang Guo & Shuhong Wang 1970, 'Study of A PMSM Model Incorporating Structural and Saturation Saliencies', 2005 International Conference on Power Electronics and Drives Systems, 2005 International Conference on Power Electronics and Drives Systems, IEEE, Kuala Lumper, Malaysia, pp. 575-580.
View/Download from: Publisher's site
View description>>
Sensorless permanent magnet synchronous motor (PMSM) drive systems have become more attractive due to their advantages, such as reduction of hardware complexity and hence the system cost and increment of system reliability. In order to correctly obtain the rotor position required for the appropriate control, various methods have been proposed. Among them, the most versatile method makes use of the structural and magnetic saturation saliencies of the PMSM. This paper presents a non-linear model of permanent magnet synchronous motors with the saliencies. The phase inductances of a PMSM motor are measured and expressed by Fourier series under different stator currents and rotor positions according to its pattern. The simulated dynamic performance is compared with that based on a model without considering saliency to verify the effectiveness of the proposed PMSM model.
Yonguang Guo, Jianguo Zhu & Haiwei Lu 1970, 'Design of SMC motors using hybrid optimization techniques and 3D FEA with increasing accuracy', 2005 International Conference on Electrical Machines and Systems, Proceedings of the Eighth International Conference on Electrical Machines and Systems, IEEE, Nanjing, China, pp. 2296-2301.
View/Download from: Publisher's site
View description>>
This paper presents the design and analysis of a three-phase three-stack permanent magnet claw pole motor with soft magnetic composite (SMC) stator core. 3D finite element analysis (FEA) of magnetic field is performed to accurately calculate key motor parameters and performance. Combined optimization techniques and 3D FEA with increasing accuracy are applied to effectively reduce the computational time. The designed motor has been fabricated and tested. The theoretical calculations are validated by the experimental results on the prototype.
YouGuang Guo, Jian Guo Zhu & Haiwei Lu 1970, 'Design and Analysis of a Permanent Magnet Claw Pole/Transverse Flux Motor with SMC Core', 2005 International Conference on Power Electronics and Drives Systems, 2005 International Conference on Power Electronics and Drives Systems, IEEE, pp. 1413-1418.
View/Download from: Publisher's site
View description>>
This paper presents the design and analysis of a claw pole/transverse flux motor (CPTFM) with soft magnetic composite (SMC) core and permanent magnet flux-concentrating rotor. Three-dimensional magnetic field finite element analysis is conducted to accurately calculate key motor parameters such as winding flux, back electromotive force, winding inductance, and core loss. Equivalent electric circuit is derived under optimum brushless DC control condition for motor performance prediction, and computer search techniques are applied for design optimization. All these computations and analyses have been implemented in a commercial software ANSYS for development of the SMC CPTFM prototype.
Zhong, JJ, Zhu, JG, Guo, YG & Lin, ZW 1970, 'Improved measurement with 20 rotating fluxes considering effect of magnetization', INTERMAG ASIA 2005: Digests of the IEEE International Magnetics Conference, p. 909.
