Engineering

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  • Quantitative analysis of electron-beam-induced-current profiles of grain boundariesin multicrystalline solar cells
    (1998) Corkish, Richard; Sproul, Alistair; Puzzer, Tom; Altermatt, Peter; Heiser, Gernot; Luke, Keung
    Conference Paper
  • Charge Collection and Radiation Hardness of a SOI Microdosimeter for Medical and Space Applications
    (1998) Bradley, Peter; Rozenfeld, Anatoly; Lee, Kevin; Jamieson, Dana; Heiser, Gernot; Satoh, S
    Journal Article
    The first results obtained using a SOI device for microdosimetry applications are presented. Microbeam and broadbeam spectroscopy methods are used for determining minority carrier lifetime and radiation damage constants. A spectroscopy model is presented which includes the majority of effects that impact spectral resolution. Charge collection statistics were found to substantially affect spectral resolution. Lateral diffusion effects significantly complicate charge collection
  • Innovations and structural applications
    (1999) Bandyopadhyay, Srikanta; Gowripalan, Nadarajah; Rizkalla, S; Dutta, P; Bhattacharyya, D
    Conference Paper
  • Annealing experiment on high-Tc superconductor Bi-2212 single crystal
    (1998) Gu, Genda; Han, Shaowei; Lin, Zheng; Zhao, Yong; Russell, Graeme
    Journal Article
  • Studies of ultracompact HIIregions - II. High-resolution radio continuum and methanol maser survey
    (1998) Walsh, Andrew; Burton, Michael; Robinson, Garry; Nyland, A
    Journal Article
  • Atomic force microscopy study of carbon fibre reinforced cementitious composites
    (1999) Bandyopadhyay, Srikanta; Kao, G; Gowripalan, Nadarajah; Postle, Ronald
    Conference Paper
  • Flux-pinning and irreversibility line in melt-textured YBa2Cu3Oy crystals of different sizes of pinning centers
    (1999) Han, Shaowei; Zhao, Yong; Choi, C; Andrikidis, C
    Journal Article
    Flux pinning force and irreversibility lines have been investigated for melt-textured YBa2Cu3Oy crystals containing Y2BaCuO5 (211) particles with an average size ranging from 20 to 0.02 microns. We found that the irreversibility lines are increasingly improved and that the pinning force as well as the Jc is greatly enhanced as the average size of the 211 particles decreases. The Fp-H curve exhibits two peaks in the samples containing very fine 211 particles (nanometer size particles), which suggests that an addition pinning mechanism is involved in this type of samples. The experimental results can be well explained with combining the interface-pinning mechanism and the match effect.
  • Powder melting process for YBa2Cu3O7-y superconductor by eutectic formation
    (1998) Choi, C; Kim, Hann; Standard, Owen; Kim, Min; Zhao, Yong; Sorrell, Charles
    Journal Article
    YBa2Cu3O7-y with high grain alignment has been successfully fabricated by a modified powder melting process at a temperature of ~930oC which is near the eutectic point of the starting materials Y2BaCuO5, BaCuO2, and CuO. In terms of the levitation force and YBa2Cu3O7-y grain alignment, the best result was shown in a sample having a Y2BaCuO5:BaCuO2:CuO molecular ratio of 1:3:5. In the present work, the Cu-surplus eutectic liquid was completely absorbed by use of a Y2BaCuO5 substrate, by which the final composition was driven to stoichiometric YBa2Cu3O7-y. The results were comparable to those obtained by the conventional melt-texture-growth process. A new invariant point apparently occurred at ~930-940oC owing to an interfacial reaction between YBa2Cu3O7-y matrix and Y2BaCuO5 substrate.
  • Huge magnetic enhancement of the out-of-plane resistivity & depression of Tc onset in Bi-2212 single crystal
    (1998) Han, Shaowei; Zhao, Yong; Gu, Genda; Russell, Graeme
    Journal Article
    During magnetoresistance measurement of Bi-2212 single crystals, we found the resistance in the c-axis direction exhibited a huge magnetic enhancement (H perpendicular to the a-b-plane) while the onset transition temperature along the c-axis showed a large depression when the magnetic fields were over a certain value (H > 180 Oe). No such phenomena were observed in small applied magnetic fields (H < 180 Oe) and in a-b-plane magnetoresistance measurements. By changing different probes (eight probes being attached to the sample, each side having four probes) for the measurement of the magnetoresistance along the c-axis with H = 2000 Oe, we found that the resistance along the c-axis in the temperature region T/Tc > 0.90 was only related to the measuring dimensions and Tc onset remained unchanged. Our results provided evidence that both Lorentz-force-independent fluctuation-induced dissipation and Lorentz-force-dependent vortex motion dissipation exist in the mixed state.