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Dissertations / Theses on the topic 'Conductors; Superconductors'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Parker, I. D. "Low dimensional conductors and superconductors." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303253.

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2

Marsden, Ian Richard. "Low dimensional organic conductors." Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239593.

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3

Lin, Yuankun. "Raman studies of low-dimensional conductors and superconductors." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ56579.pdf.

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4

Nichol, A. C. "Infrared spectroscopy of solids." Thesis, University of Oxford, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308601.

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5

Vaccarella, Cawley D. "A theoretical analysis of the spin susceptibility tensor and quasiparticle density of states for quasi-one-dimensional superconductors." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/27670.

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6

Weigand, Marcus. "Grain boundaries in coated conductors." Thesis, University of Cambridge, 2010. https://www.repository.cam.ac.uk/handle/1810/226744.

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The excitement which followed the discovery of high-temperature superconductors in 1986 was short-lived, as it became clear that their current carrying capacity (the critical current density Jc) was limited by grain boundaries (GBs). In order to reduce their detrimental effects coated conductors have been developed, in which a superconducting thin film is deposited on a polycrystalline, textured substrate. Within certain temperature and magnetic field ranges, however, GBs still limit the overall Jc. This fact motivated the present thesis, for which the electrical properties of different types

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7

Cayado, Llosa Pablo. "Multifunctional nanostructured superconductors by chemical routes: towards high current conductors." Doctoral thesis, Universitat Autònoma de Barcelona, 2016. http://hdl.handle.net/10803/384856.

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Uno de los temas de mayor interés en el ámbito de la superconductividad es la fabricación de cintas superconductoras (CCs) de YBa2Cu3O6+δ (YBCO) debido a las excelentes propiedades superconductoras que poseen y a las prometedoras perspectivas en cuanto a aplicaciones se refiere. Sin embargo, para poder generalizar el uso de dichas CCs, se requiere de un proceso de fabricación de bajo coste. En este contexto, la técnica de deposición por solución química se presenta como una alternativa muy prometedora. Las CCs pueden cumplir los requisitos actuales exigidos en diferentes aplicaciones, pero hay

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8

Soltanian, Saeid. "Development of superconducting magnesium diboride conductors." Institute for Superconducting & Electronic Materials - Faculty of Engineering, 2004. http://ro.uow.edu.au/theses/381.

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The work in this thesis concentrates on the fabrication and characterization of MgB2 superconducting bulk wire and tape. An overview of the research on MgB2 superconductor during the last three years is also provided. High transport and magnetic critical current density values above 105 A/cm2 have been obtained for metal-clad wires and tapes. Fe-clad MgB2 tapes were fabricated using a powder-in-tube technique. The tape shows a sharp transition with a transition width ΔTc of 0.2 K and a Tc0 of 37.5 K. An high transport critical current value of 1.7 × 104 A/cm2 for both 29.5 K in 1 Tesla and 33

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9

Duncan, R. D. (Richard D. ). "A Quantum phase trasition in d-wave superconductors and symmetry features of quasi-one-dimensional superconductors." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/29337.

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10

Takahashi, Susumu. "Angle-dependent high magnetic field microwave spectroscopy of low dimensional conductors and superconductors." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0012927.

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11

Mosiadz, Mariusz. "Inkjet printing of buffer and superconducting layers for YBa₂Cu₃O₇₋x coated conductors." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610415.

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12

Al-Hossain, Md Shahriar. "Study of superconducting and electromagnetic properties of un-doped and organic compound doped MgB₂ conductors." Access electronically, 2008. http://ro.uow.edu.au/theses/90.

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13

Mitchell-Williams, Thomas Benjamin. "Tailoring superconductor and SOFC structures for power applications." Thesis, University of Cambridge, 2017. https://www.repository.cam.ac.uk/handle/1810/267811.

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High temperature superconductors (HTS) and solid oxide fuel cells (SOFCs) both offer the possibility for dramatic improvements in efficiency in power applications such as generation, transmission and use of electrical energy. However, production costs and energy losses prohibit widespread adoption of these technologies. This thesis investigates low-cost methods to tailor the structures of HTS wires and SOFCs to reduce these energy losses. Section I focusses on methods to produce filamentary HTS coated conductors that show reduced AC losses. This includes spark-discharge striation to pattern ex

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14

Keys, Simon Alastair. "Temperature and strain scaling laws for the critical current density in Nb(_3)Sn and Nb(_3)Al conductors in high magnetic fields." Thesis, Durham University, 2001. http://etheses.dur.ac.uk/3951/.

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Detailed, accurate measurements of critical current density and resistivity to determine the upper critical field have been made on a technological NbsAl conductor in magnetic fields up to 15 T, temperatures from 4.2 K up to the critical temperature and in the strain range from -1.8% to 0.7%. The uncertainty in temperature above 4.2 K was equivalent to ± 100 mK with a stability during the measurements of < 5 mK up to a limiting current of 80 A and a typical noise level of 1 µ Vm(^-1).When B(_c2){T,ε) is defined at 5%pn, 50%pn or 95%/%pn, an empirical relation is found where and an approximate

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15

Chtioui, Gay Imane. "Synthèse et caractérisation de nanoparticules de conducteurs et de supraconducteurs moléculaires : Application à la thermoélectricité." Thesis, Toulouse 3, 2015. http://www.theses.fr/2015TOU30292/document.

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Ce travail a concerné la préparation des premières nanoparticules de supraconducteurs moléculaires dont la croissance en solution a pu être contrôlée par l'ajout de molécules amphiphiles neutres (amines, imines, acides carboxyliques). Notre étude s'est principalement focalisée sur les sels de Bechgaard (TMTSF)2X (TMTSF : tétraméthyltétrasélénafulvalène, X = ClO4 ou PF6) et sur le dérivé (BEDT-TTF)2I3 (BEDT-TTF : bis(éthylènedithio)tétrathiafulvalène). La taille, la morphologie et l'état de dispersion des nanoparticules ont été contrôlés par la nature et la concentration du structurant amphiphi

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16

Engel, Sebastian. "Chemisch deponierte Schichtsysteme zur Realisierung von YBa2Cu3O7−d-Bandleitern." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1244452357143-40430.

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Die vorliegende Arbeit beschäftigt sich mit der Entwicklung neuer Schichtsysteme für die Realisierung biaxial texturierter hochtemperatursupraleitender Bandleiter. Bisher sind eine Vielzahl von Bandleiterarchitekturen bekannt, die sowohl durch physikalische Depositionsmethoden als auch mittels Abscheidung aus der chemischen Lösung hergestellt werden können. Während die Funktion von YBCO-Bandleitern mit Hilfe physikalischer Depositionsmethoden in den letzten Jahren demonstriert werden konnte, zeigen auf chemischem Wege deponierte Bandleiter schlechtere Eigenschaften. Seitens der Industrie beste

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17

Katcher, Thomas. "High Tc superconductors melt processing and high flexibility composite conductor construction." Ohio : Ohio University, 1992. http://www.ohiolink.edu/etd/view.cgi?ohiou1172688742.

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18

Engel, Sebastian. "Chemisch deponierte Schichtsysteme zur Realisierung von YBa2Cu3O7−d-Bandleitern." Doctoral thesis, Technische Universität Dresden, 2008. https://tud.qucosa.de/id/qucosa%3A23824.

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Die vorliegende Arbeit beschäftigt sich mit der Entwicklung neuer Schichtsysteme für die Realisierung biaxial texturierter hochtemperatursupraleitender Bandleiter. Bisher sind eine Vielzahl von Bandleiterarchitekturen bekannt, die sowohl durch physikalische Depositionsmethoden als auch mittels Abscheidung aus der chemischen Lösung hergestellt werden können. Während die Funktion von YBCO-Bandleitern mit Hilfe physikalischer Depositionsmethoden in den letzten Jahren demonstriert werden konnte, zeigen auf chemischem Wege deponierte Bandleiter schlechtere Eigenschaften. Seitens der Industrie beste

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19

Saldívar, Flores Oscar. "Formas de producir cables superconductores." Bachelor's thesis, Universidad Nacional Mayor de San Marcos, 2015. https://hdl.handle.net/20.500.12672/5255.

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Ofrece una visión general de los cables superconductores, cómo está formado un cable superconductor además de sus diseños, los proyectos que se están dando en el mundo y los beneficios que tiene la implementación de estos cables en la red eléctrica.<br>Trabajo de suficiencia profesional

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20

Katcher, Thomas. "High T_c superconductors: Melt processing and high flexibility composite conductor construction." Ohio University / OhioLINK, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1172688742.

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21

González, González Juan Carlos. "Coated Conductors and Chemical Solution Growth of YBCO Films: A Micro-Raman Spectroscopy Study." Doctoral thesis, Universitat Autònoma de Barcelona, 2005. http://hdl.handle.net/10803/3361.

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Presentamos los estudios no destuctivos realizados sobre cintas cuperconductoras y capas de YBCO crecidas por la técnica de MOD-TFA mediante la espectroscopía micro-Raman, complementados por otras técnicas tales como XRD, SEM, TEM, resistividad y densidad de corriente crítica. Determinamos cuantitativamente el grado de textura uniaxial y biaxial de las cintas superconductoras de YBCO e investigamos aspectos tales como la orientación del cristal, uniformidad, fases secundarias, impurezas, contenido de oxígeno y defectos de las capas crecidas mediante MOD-TFA, basados en las reglas de seleccción

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22

Cavallaro, Andrea. "Optimisation of CSD buffer layers for YBa(2)Cu(3)O(7) coated conductor development." Doctoral thesis, Universitat Autònoma de Barcelona, 2005. http://hdl.handle.net/10803/3218.

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Las cintas superconductoras de alta temperatura (HTS) han emergido como materiales prometedores para sus uso en el campo de l'energía puesto que permiten reducir a mitad el tamaño de los equipos de energía eléctrica respecto a los convencionales, reducir las pérdidas de energía, aumentar la eficacia en la generación, la transmisión y la distribución de la misma, y así la reducir el impacto ambiental.<br/>Sin embargo, diversamente de los conductores típicos, los materiales superconductores basados en óxido son frágiles, se dañado fácilmente y son así difíciles de procesar. Hasta ahora ha sido p

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23

Zhang, Wei. "Triplet Superfluidity in Quasi-one-dimensional Conductors and Ultra-cold Fermi Gases." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/14139.

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This thesis presents theoretical investigations of triplet superfluidity (triplet superconductivity) in quasi-one-dimensional organic conductors and ultra-cold Fermi gases. Triplet superfluidity is different from its s-wave singlet counterpart since the order parameter is a complex vector and the interaction between fermions is in general anisotropic. Because of these distinctions, triplet superfluids have different physical properties in comparison to the s-wave case. The author discusses in this thesis the interplay between triplet superconductivity and spin density waves in quasi-one-dimens

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24

Dhakal, Pashupati. "Angular Magnetoresistance Oscillations in the Molecular Organic Conductor (DMET)₂I₃: Experiment and Calculation." Thesis, Boston College, 2010. http://hdl.handle.net/2345/1566.

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Thesis advisor: Michael J. Naughton<br>Quasi-one dimensional (Q1D) molecular organic conductors are among the most exciting materials in condensed matter physics, exhibiting nearly every known ground state. They are highly anisotropic, structurally and electronically, and show large oscillatory phenomena in conductivity for magnetic field rotated in different crystalline planes. Several theoretical works have been published to explain these angular magnetoresistance oscillation (AMRO) effects, but the underlying physics remains illunderstood. Here, we present measurements and calculations of m

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25

Brun, Sulyvan. "Etudes structurales des conducteurs organiques bidimensionnels à haute pression." Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENY034/document.

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Les conducteurs organiques à base du sel de transfert de charge bis(éthylènedithio)tétrathiafulvalène (BEDT-TTF ou ET) montrent un comportement électrique allant de semi-conducteur à métal supraconducteur. La pression peut induire des petits changements structuraux qui s'accompagnent de changements très important des propriétés physiques. L'étude de l'évolution de la structure de ces composés sous pression, dont les mailles sont de faible symétrie contenant plusieurs dizaines d'atomes légers, constitue un défi. Le but de ce travail est d'étudier ces changements structuraux induits par la press

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26

Faulmann, Christophe. "Conducteurs derives de metaux de transition : complexes moleculaires, polymeres, oxydes de cuivre." Toulouse 3, 1988. http://www.theses.fr/1988TOU30160.

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27

Fertey, Pierre. "Adaptation de la diffraction des rayons X par des poudres à l'étude des transitions de phases structurales entre 3K et 470K : application à l'étude des corrélations entre propriétés électroniques et structurales dans le composé organique (TMTSF)2ClO4." Université Joseph Fourier (Grenoble ; 1971-2015), 1995. http://www.theses.fr/1995GRE10196.

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La premiere partie est consacree a une revue des developpements de la technique experimentale de la diffraction des rayons x par des echantillons polycristallins (methode des poudres). Il est ici demontre que cette technique est aujourd'hui une methode pertinente pour l'analyse des proprietes structurales des materiaux. Dans une seconde partie, une application originale de la methode des poudres est presentee: un diffractometre de haute resolution fonctionnant entre 3 k et 470 k, a ete concu puis realise, pour l'analyse des contributions structurales dans les mecanismes regissant les transitio

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28

Gau, Jine-Je, and 高敬哲. "Comparison of Power Dissipation in Normal Conductors and Superconductors." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/24700412664486737957.

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碩士<br>國立臺灣大學<br>電信工程學研究所<br>92<br>In this thesis, basic theories of superconductivity are applied estimating the characteristics of high-temperature superconductor(HTS) components such as attenuation and Q factor. The properties of parallel-plate waveguide(PPWG) made of YBCO thin film and aluminum, rectilinear cacities made of YBCO thick film and copper are analyzed. The frequency-dependence of electron density is proposed to obtain reasonable attenuation of YBCO PPWG especially when the operating frequency is near critical frequency.

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29

Kaiser, Stefan [Verfasser]. "Interplay of charge order and superconductivity : optical properties of quarter-filled two-dimensional organic conductors and superconductors / vorgelegt von Stefan Kaiser." 2010. http://d-nb.info/1008871702/34.

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30

Teyller, Jaime Leandro Lino. "Contribution for the Optimization of the Design and Manufacture of Low-Resistance Short-Circuited Superconducting Coils." Master's thesis, 2019. http://hdl.handle.net/10362/72305.

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The present dissertation intends to contribute to the optimization process of the design and manufacture of low-resistance short-circuited superconducting coils in an architecture developed in Department of Electrical Engineering of Faculdade de Ciências e Tecnologia (DEE-FCT) of the Universidade NOVA de Lisboa. The design optimization of the previously proposed coil architecture is carried out in this work. After validation of the new design, the superconducting tapes are cut through two different methods, i.e. by water jet and punching. The critical current of the tapes is measured to

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31

Yang, Chau-Yun. "Microstructure of RABiTS-type high-Tc superconductor coated conductors /." 2001. http://www.library.wisc.edu/databases/connect/dissertations.html.

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32

Mbaruku, Abdallah Schwartz Justin. "Electromechanical and fatigue properties of as-manufactured and quench damaged YBCO coated conductor." Diss., 2006. http://etd.lib.fsu.edu/theses/available/etd-03292006-174521.

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Thesis (Ph. D.)--Florida State University, 2006.<br>Advisor: Justin Schwartz, Florida State University, College of Engineering, Dept. of Mechanical Engineering. Title and description from dissertation home page (viewed June 16, 2006). Document formatted into pages; contains xvi, 132 pages. Includes bibliographical references.

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33

Tsai, Chen-Fong. "Enhanced Flux-Pinning Properties in Superconducting YBa2Cu3O7-δ Thin Films with Nanoengineering Methods". Thesis, 2013. http://hdl.handle.net/1969.1/149478.

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Since the discovery of the high temperature superconductor YBa2Cu3O7-δ (YBCO), with transition temperature (Tc = 77 K), above liquid nitrogen point in 1987 many research projects have been dedicated to enhancing the high field performance of this material for practical applications. The 2nd generation YBCO-based coated conductors are believed to be the most promising approach for commercial applications including power transmission, motors, generators, and high field magnets. With the advances of nanotechnologies, different nanoengineering methods have been demonstrated to enhance the performa

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