Spelling suggestions: "subject:"hightemperature superconductors"" "subject:"hightemperature superconductors""
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Epitaxial growth of YBa2Cu3O7-x (110) thin films on SrTiO3 (110) substrates.January 1993 (has links)
by Tang Yeung Shun. / On t.p., "2", u "3", "7-x", and O"3" are subscripts following "growth of" in the title. / Parallel title in Chinese characters. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1993. / Includes bibliographical references (leaves 87-89). / Chapter Chapter 1 : --- Introduction --- p.1 / Chapter Chapter 2 : --- Preparation of Thin Films --- p.10 / Chapter Chapter 3 : --- Structural Analysis / Chapter 3.1 --- Setup of XRD --- p.14 / Chapter 3.2 --- θ-2θ Scan --- p.17 / Chapter 3.3 --- Rocking Curve --- p.27 / Chapter 3.4 --- Pole Figure --- p.29 / Chapter 3.5 --- Off-axis Scan --- p.33 / Chapter 3.6 --- Grazing Incidence X-ray Diffraction --- p.53 / Chapter 3.7 --- Percentage of (110) Phase --- p.59 / Chapter 3.8 --- Lattice Parameters --- p.63 / Chapter Chapter 4 : --- Transport Properties / Chapter 4.1 --- Experimental --- p.66 / Chapter 4.2 --- Results --- p.68 / Chapter Chapter 5 : --- Surface Morphology --- p.75 / Chapter Chapter 6 : --- Discussion --- p.80 / Chapter Chapter 7 : --- Conclusions --- p.85 / References --- p.87 / Appendix A : Powder Diffraction Patterns of YBCO System
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Presputtering effect in deposition of YBa2Cu3O7 thin films by magnetron sputtering techniques.January 1992 (has links)
by Sou Ka Hou. / On t.p. "2', "3", and "T" are subscript following "deposition of" in the title. / Parallel title in Chinese characters. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1992. / Includes bibliographical references (leaves [88]). / Chapter 1. --- Introduction --- p.1 / Chapter 2. --- Computer-controlled sputtering system for deposition of high Tc thin films --- p.10 / Chapter 2.1 --- Introduction --- p.10 / Chapter 2.2 --- Vacuum system --- p.12 / Chapter 2.3 --- Gas flow control --- p.16 / Chapter 2.3.1 --- Design --- p.16 / Chapter 2.3.2 --- Flow control --- p.18 / Chapter 2.4 --- Gas pressure control --- p.21 / Chapter 2.4.1 --- Gauges --- p.21 / Chapter 2.4.2 --- Control method --- p.21 / Chapter 2.5 --- "Sputtering, guns and deposition control" --- p.24 / Chapter 2.5.1 --- Types --- p.24 / Chapter 2.5.2 --- Orientation of the sputter gun --- p.26 / Chapter 2.5.3 --- Dual magnetron gun system --- p.26 / Chapter 2.5.4 --- Deposition control system --- p.27 / Chapter 2.6 --- Substrate holder and temperature control --- p.30 / Chapter 2.6.1 --- Substrate holder --- p.30 / Chapter 2.6.2 --- Substrate temperature control --- p.31 / Chapter 2.7 --- Interlock protection --- p.34 / Chapter 2.8 --- Control program --- p.35 / Chapter 3. --- The presputtering effect --- p.39 / Chapter 3.1 --- Presputtering effect (a review) --- p.39 / Chapter 3.2 --- Emission spectroscopy on sputtered materials --- p.48 / Chapter 3.3 --- Experimental --- p.49 / Chapter 3.4 --- Emission spectra --- p.53 / Chapter 3.4.1 --- Effect of sputter power source --- p.53 / Chapter 3.4.2 --- Effect of gas ratio --- p.58 / Chapter 3.4.3 --- Effect of gas pressure --- p.64 / Chapter 3.4.4 --- Study of presputtering effect --- p.67 / Chapter 3.4.5 --- Monitoring the evaporation rate by the spectral line intensities --- p.71 / Chapter 4. --- Conclusion and discussion --- p.75 / Chapter Appendix A. --- Motor control --- p.77 / Chapter Appendix B. --- Thin film deposition --- p.82
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properties of MgB₂ fabricated by powders-mixing approach and sandwich structure approach. / 以粉末混合方法及夾心樣品方法製作的硼化鎂的特性研究 / The properties of MgB₂ fabricated by powders-mixing approach and sandwich structure approach. / Yi fen mo hun he fang fa ji jia xin yang pin fang fa zhi zuo de peng hua mei de te xing yan jiuJanuary 2008 (has links)
Yeung, Him Ching = 以粉末混合方法及夾心樣品方法製作的硼化鎂的特性研究 / 楊謙靖. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2008. / Includes bibliographical references. / Abstracts in English and Chinese. / Yeung, Him Ching = Yi fen mo hun he fang fa ji jia xin yang pin fang fa zhi zuo de peng hua mei de te xing yan jiu / Yang Qianjing. / Abstract --- p.i / 摘要 --- p.iii / Acknowledgments --- p.v / Table of contents --- p.vi / List of table captions --- p.viii / List of figure captions --- p.ix / Chapter Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Superconductors --- p.1 / Chapter 1.1.1 --- Classifications --- p.1 / Chapter 1.1.2 --- Conventional versus unconventional --- p.2 / Chapter 1.1.3 --- Type I and Type II superconductors --- p.4 / Chapter 1.1.4 --- Critical current Jc and the Bean´ةs Model --- p.5 / Chapter 1.2 --- Magnesium diboride --- p.8 / Chapter 1.2.1 --- Structure --- p.8 / Chapter 1.2.2 --- Physical properties --- p.8 / Chapter 1.2.3 --- Chemical properties --- p.9 / Chapter 1.2.4 --- Conduction mechanisms --- p.9 / Chapter 1.2.5 --- Fabrication methods --- p.9 / Chapter 1.3 --- Objectives of this work --- p.10 / References --- p.12 / Figures --- p.14 / Chapter Chapter 2 --- Methodology and instrumentation --- p.17 / Chapter 2.1 --- Experimental procedures --- p.17 / Chapter 2.2 --- Samples preparation --- p.17 / Chapter 2.2.1 --- Powder mixing approach --- p.17 / Chapter 2.2.2 --- Sandwich structure approach --- p.18 / Chapter 2.3 --- Samples fabrication --- p.18 / Chapter 2.4 --- Determination of compositions --- p.18 / Chapter 2.5 --- Characterization --- p.19 / Chapter 2.5.1 --- X-ray diffractometry (XRD) --- p.19 / Chapter 2.5.2 --- Microstructural analysis --- p.20 / Chapter 2.5.3 --- Magnetic measurements --- p.20 / Chapter 2.5.3.1 --- Setup for Jc measurements --- p.21 / Reference --- p.22 / Figures --- p.23 / Chapter Chapter 3 --- Powder mixing approach --- p.26 / Chapter 3.1 --- Results --- p.26 / Chapter 3.1.1 --- XRD results --- p.26 / Chapter 3.1.2 --- Compositions --- p.27 / Chapter 3.1.3 --- SEM results --- p.28 / Chapter 3.1.3.1 --- Sample sintered at 600°C --- p.28 / Chapter 3.1.3.2 --- Samples sintered at 700°C and 800°C --- p.28 / Chapter 3.1.3.3 --- Sample sintered at 900°C --- p.29 / Chapter 3.1.3.4 --- Sample sintered at 1000°C --- p.29 / Chapter 3.1.3.5 --- Sample sintered at 1050°C --- p.29 / Chapter 3.1.4 --- VSM results --- p.30 / Chapter 3.1.4.1 --- Tc measurements --- p.30 / Chapter 3.1.4.2 --- Hysteresis loops --- p.31 / Chapter 3.1.5 --- Jc measurements --- p.31 / Chapter 3.1.5.1 --- Direct measurement --- p.31 / Chapter 3.1.5.2 --- The Bean´ةs Model --- p.32 / Chapter 3.2 --- Discussions --- p.32 / Chapter 3.3 --- Summary --- p.35 / References --- p.36 / Figures --- p.37 / Tables --- p.47 / Chapter Chapter 4 --- Sandwich structure approach --- p.49 / Chapter 4.1 --- Results --- p.49 / Chapter 4.1.1 --- SEM results --- p.49 / Chapter 4.1.1.1 --- Surface of the Mg disk --- p.49 / Chapter 4.1.1.2 --- Inner region of the Mg disk --- p.50 / Chapter 4.1.2 --- XRD results --- p.50 / Chapter 4.1.2.1 --- Surface of the Mg disk --- p.50 / Chapter 4.1.2.2 --- Inner region of the Mg disk --- p.51 / Chapter 4.1.3 --- VSM results --- p.51 / Chapter 4.1.3.1 --- Tc measurement --- p.51 / Chapter 4.1.3.2 --- Hysteresis loops --- p.52 / Chapter 4.2 --- Discussions --- p.52 / Chapter 4.3 --- Summary --- p.54 / Reference --- p.54 / Figures --- p.55 / Tables --- p.61 / Chapter Chapter 5 --- Growth Mechanism --- p.62 / Chapter 5.1 --- Introduction --- p.62 / Chapter 5.2 --- Brief summary of results --- p.62 / Chapter 5.2.1 --- Powder mixing approach --- p.62 / Chapter 5.2.2 --- Sandwich structure approach --- p.63 / Chapter 5.3 --- Formation of the MgB2 platelets --- p.63 / Chapter 5.4 --- Size of the MgB2 platelets --- p.67 / Chapter 5.5 --- Summary --- p.68 / References --- p.69 / Figures --- p.70 / Tables --- p.75 / Chapter Chapter 6 --- Conclusions and suggestions of future work --- p.76 / Chapter 6.1 --- Summary --- p.76 / Chapter 6.2 --- Future work --- p.77 / Appendix 1 --- p.79 / Appendix 2 --- p.81
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Non-inductive solenoid coils based on second generation high-temperature superconductors and their application in fault current limitersLiang, Fei January 2017 (has links)
The gradual increase in global warming and environmental pollution has made low-carbon technologies an urgent need for the whole world. Superconducting technology, which is known for its extremely high conductivity and high power density, is capable enough to provide novel solutions, contributing to the future smart grid, thus aiding the power industry towards the realisation of a low-carbon and green planet. In recent decades, several industrial applications using superconducting technology have been developed. Of them, particularly in the power industry, a range of superconducting applications including superconducting magnetic energy storage (SMES), superconducting motors/generators, superconducting cables and superconducting fault current limiters (SFCLs) have been developed. Among them, SFCLs are one of the most promising and are successfully being implemented in power distribution networks. SFCLs exhibit low impedance during normal operation and gain considerable impedance under a fault condition, providing a new solution to the increasingly high fault current levels. However, most of the SFCL projects are limited to low-voltage and medium-voltage levels, there are very few successful operational trials of high voltage SFCLs. This thesis, for the first time, studies the comprehensive characteristics of solenoid type SFCLs based on second generation (2G) high temperature superconductors (HTS), which may be successfully implemented in power grids with high voltage levels. The main contributions of this work include three aspects: 1) proposing an innovative method for simulating the AC losses of the solenoid coils and an electro-magneto-thermal model for simulating the SFCL’s current limiting property; 2) comprehensive and in-depth comparison study concerning the application of the two types of non-inductive solenoid coils (braid type and non-intersecting type) in SFCLs both experimentally and numerically; and 3) the first and thorough discussion of the impact of different parameters such as pitch and radius of coils to the overall performance of braid type SFCLs and the validation of the braid type SFCL concept with a 220 V/300 A SFCL prototype. Based on these experimental and simulation works, the thesis provide strong guidance for the development of future non-inductive solenoid type SFCLs based on 2G HTS, which are promising for high voltage level power grid applications.
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Theoretical study of high transition temperature superconducting Cu-oxideYang, Kaiyu. January 2006 (has links)
Thesis (Ph. D.)--University of Hong Kong, 2006. / Title proper from title frame. Also available in printed format.
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Neutron irradiation and dc transport in YBaCuO single crystals : a study of vortex depinningBrown, Brandon R. 08 May 1997 (has links)
Graduation date: 1997
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Chemical phases in the Y-Ba-Cu-O system identified by TDPACF��ssel, Alexander 14 July 1993 (has links)
Graduation date: 1994
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Performances of small fault current limiting breaker model with high Tc SuperconductorMatsumura, Toshiro, Aritake, Tomohiro, Yokomizu, Yasunobu, Shimizu, Hirotaka, Murayama, Norimitsu 06 1900 (has links)
No description available.
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NMR investigations in copper-oxide chain compounds and high-T(C) superconductorsDrandova, Gergana Ilieva. January 2001 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 2001. / Vita. Includes bibliographical references. Available also from UMI/Dissertation Abstracts International.
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Room temperature molten salts as media for the development of negative electrodes in lithium ion batteries and the electrochemical formation of high temperature superconductor precursor /Zhu, Derong, January 2002 (has links)
Thesis (Ph. D.)--University of Hong Kong, 2002. / Includes bibliographical references.
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