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Dissertations / Theses on the topic 'Superconducting bulks'

Author: Grafiati

Published: 8 June 2024

Last updated: 19 July 2025

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1

Bozzo, Closas Bernat. "Superconducting joining of melt textured YBCO bulks." Doctoral thesis, Universitat Autònoma de Barcelona, 2016. http://hdl.handle.net/10803/369047.

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La obtenció de ceràmiques superconductores de YBa2Cu3O7 porta implícita una limitació en les dimensions i forma de les peces. Per tal de superar aquesta limitació, s’ha proposat un mètode de soldadura basat en l’ús d’una làmina de plata com a decapant. Aquest treball de Tesi està enfocat en: • El perfeccionament de la tècnica de soldadura de YBCO per tal de resoldre una sèrie de problemàtiques presents en el moment de començar aquest treball. • Caracterització de la microestructura de les mostres soldades. • El desenvolupament d’eines d’anàlisi quantitatiu per avaluar la qualitat de la sol

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2

Patel, Anup. "Pulsed field magnetization of composite superconducting bulks for magnetic bearing applications." Thesis, University of Cambridge, 2013. https://www.repository.cam.ac.uk/handle/1810/256579.

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Permanent magnets are essential components for many devices such as motors, which currently account for 45 % of global electricity consumption, generators and also superconducting magnetic bearings used for applications such as flywheel energy storage. But even the most powerful rare-earth magnets are limited to a remanent field of 1.4 T, whereas superconducting materials such as YBCO in their bulk form have the extraordinary ability to trap magnetic fields an order of magnitude higher, whilst being very compact. This gives them the potential to increase efficiency and allow significant volume

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3

Yan, Yu. "Thermally actuated magnetisation flux pump system for high temperature superconducting bulks." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609510.

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4

Huang, Zhen. "A fully high temperature superconducting synchronous motor using pulsed field magnetization, bulks, and 2G HTS coils." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.709396.

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5

Susner, Michael A. "Influences of Crystalline Anisotropy, Doping, Porosity, and Connectivity on the Critical Current Densities of Superconducting Magnesium Diboride Bulks, Wires, and Thin Films." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1344984007.

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6

Dorget, Rémi. "Étude et conception d'une machine supraconductrice à modulation de flux pour application aéronautique." Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0018.

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Dans le cadre de la lutte contre le changement climatique, l'industrie aéronautique s'est fixé pour objectif la neutralité carbone totale en 2050. Pour cela, l'emploi de technologies de rupture est nécéssaire pour réduire les émissions de ce secteur en forte croissance. Parmi ces technologies, on retrouve l'électrification mais dont le déploiement nécessite de disposer de machines électriques à forte puissance spécifique. Dans ce contexte la supraconductivité peut être une voie d'amélioration pour les machines électriques grâce aux fortes densités de courant ainsi qu'aux champs magnétiques int

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7

Grira, Sarra. "Microstructure, texture and superconductive properties of High Temperature Superconducting "HTS" oxides : yBCO thin films and bulk NBCO and YBCO." Thesis, Metz, 2009. http://www.theses.fr/2009METZ005S/document.

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Ce travail concerne l'étude de la texture et de la microstructure en relation avec les propriétés supraconductrices Tc et Jc de supraconducteurs haute température critique SHTc : YBCO et NBCO. Les techniques de caractérisation utilisées pour la microstructure sont la diffraction de RX et la diffraction d'électrons (Electron Back-Scatter Diffraction) "EBSD". Tc et Jc ont été déduits des mesures d'aimantation et de susceptibilité magnétique au SQUID (Superconducting Quantum Interference Device) et PPMS (Physical Properties Measument System). La première partie de l'étude traite de la caractérisa

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8

Kurupakorn, C., N. Hayakawa, N. Kashima, et al. "Development of high temperature superconducting fault current limiting transformer (HT/sub c/-SFCLT) with Bi2212 bulk coil." IEEE, 2004. http://hdl.handle.net/2237/6750.

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9

Manton, Stephen John. "Fabrication and characterisation of high temperature superconducting bulk YBCO." Thesis, University of Southampton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.396128.

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10

Shimizu, H., K. Kato, Y. Yokomizu, T. Matsumura, and N. Murayama. "Resistance rise in Bi2223 superconducting bulk after normal transition due to overcurrent." IEEE, 2001. http://hdl.handle.net/2237/6782.

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11

Zhao, Wen. "Improvement in the growth and superconducting properties of bulk Sm-Ba-Cu-O superconductors fabricated in air." Thesis, University of Cambridge, 2017. https://www.repository.cam.ac.uk/handle/1810/269923.

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Sm-Ba-Cu-O (SmBCO), which is a member of rare-earth barium cuprate [(RE)BCO] high-temperature superconductors, has significant potential for practical applications due to its higher critical transition temperature (Tc), higher critical current density (Jc), the so-called ‘peak effect’ characteristic at relatively high applied magnetic field and higher irreversibility field than that of the more established YBCO. The aim of this study is to investigate and overcome the obstacles in fabricating SmBCO bulk superconductors in air, to further improve their superconducting properties and, finally, t

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12

Kato, K., T. Noda, H. Shimizu, T. Matsumura, and N. Murayama. "Increase in transient resistance of Bi2223 superconducting bulk by applying external magnetic field." IEEE, 2001. http://hdl.handle.net/2237/6784.

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13

Yang, Yuan. "Influence of Chemical Doping on Microstructures and Superconducting Properties of MgB2 Wires and Bulk Samples." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1469187563.

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14

Shimizu, H., Y. Yokomizu, T. Matsumura, and N. Murayama. "Proposal of flux flow resistance type fault current limiter using Bi2223 high T/sub c/ superconducting bulk." IEEE, 2002. http://hdl.handle.net/2237/6785.

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15

Sofie, Stephen W. "Processing of doped YBa₂Cu₃0₇₋x melt textured bulk single crystals for enhanced superconducting properties /." Thesis, Connect to this title online; UW restricted, 2002. http://hdl.handle.net/1773/10612.

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16

Norsworthy, Mark A. (Mark Andrew). "Characterization of ferromagnetic saturation at 4.2K of selected bulk rare earth metals for compact high-field superconducting cyclotrons." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/62700.

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Thesis (S.M. and S.B.)--Massachusetts Institute of Technology, Dept. of Nuclear Science and Engineering, 2010.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 39).<br>The saturation magnetization of the rare earth ferromagnetic metals gadolinium and holmium was investigated. Cylindrical samples were placed in a superconducting test magnet and induced magnetic field measured at various applied fields. Data was obtained with Hall sensors mounted at the tips of the cylinders, and a powerful analytical calculation was derived to allow estimation of the saturatio

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17

Valente-Feliciano, Anne-Marie. "Development of SRF monolayer/multilayer thin film materials to increase the performance of SRF accelerating structures beyond bulk Nb." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112254/document.

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La réduction du cout de construction et d’exploitation des futurs accélérateurs d particules, a grande et petite échelles, dépend du développement de nouveaux matériaux pour les surfaces actives des structures supraconductrices en radiofréquence (SRF). Les propriétés SRF sont essentiellement un phénomène de surface vu que la profondeur de pénétration (profondeur de pénétration de London, λ) des micro-ondes (RF) est typiquement de l’ordre de 20 à 400 nm en fonction du matériau. Lorsque les procédés de préparation de surface sont optimises, la limite fondamentale du champ RF que les surfaces SRF

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18

Lewin, Richard Peter. "Superconductors and high magnetic fields." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:09992030-625d-4e6c-8152-6a61bb2cdb07.

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This thesis describes a portfolio of work aimed at the high field applications of superconductors and can be split into four main topics: The thermal stability of technical superconductors. This section investigates the effects of thermal perturbations on technical superconducting wire used in MRI scanner construction. The ultimate aim of this section is to predict how the architecture of the wire may affect its thermal stability. To this end a detailed finite element analysis model was constructed, verified by detailed experimental data, which could then be used to quickly and easily vary the

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19

Silva, Jorge Manuel Marques. "Application of superconducting bulks and stacks of tapes in electrical machines." Master's thesis, 2015. http://hdl.handle.net/10362/15630.

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The present dissertation focuses on the research of the recent approach of innovative high-temperature superconducting stacked tapes in electrical ma-chines applications, taking into account their potential benefits as an alternative for the massive superconducting bulks, mainly related with geometric and me-chanical flexibility. This work was developed in collaboration with Institut de Ciència de Ma-terials de Barcelona (ICMAB), and is related with evaluation of electrical and magnetic properties of the mentioned superconducting materials, namely: analysis of magnetization of a bulk sample t

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20

Shih, Chia-Ming, and 石家銘. "Superconducting properties of bulk MgB2." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/9f76ge.

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碩士<br>中原大學<br>應用物理研究所<br>91<br>For the preparation of good bulk MgB2, we first pressed the MgB2 powder into a pellet, heat treatment under high temperature and 1 atm Ar circulation was then proceeded. XRD was used to evaluate our post-treatment MgB2 pellet, and SQUID was used to measure its magnetic properties. Tc, Hc1(0), Hc2(0), ξ(0), λ(0), κ, the important superconducting parameters of the bulk， was then inferred from the measure data. Finally， using Beam model and ΔM of our hysteresis magnetization curves， the critical supercurrent density Jc could easily be determined. Our experimenta

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21

Guan, Syu-You, and 關旭佑. "Superconducting topological surface states in thenoncentrosymmetric bulk superconductor PbTaSe2." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/gx33b5.

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博士<br>國立臺灣大學<br>物理學研究所<br>105<br>In this thesis, we first introduce the previous study of topological insulator and the topological superconductor. The discovery of topological insulator (TI) is a recent breakthrough of physics. The topological protect surface in TI, forbidden the backscattering of electrons, gives new transport properties of the material. Combining the superconductor with the topological properties may host a type of new material called topological superconductor (TSC). The search for TSCs is one of the most urgent contemporary problems in condensed matter systems. TSCs are c

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22

Chu, Hwa Wei, and 朱華偉. "Improvement of Superconducting Properties in NdBa2Cu3O7 Melt-Textured Bulk Superconductor." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/23386402947988976971.

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碩士<br>國立臺灣大學<br>化學工程學研究所<br>87<br>The object of this study is to improve the superconducting properties of the MTG 123 bulk. We found that the increasing dose of Nd422 could improve the Tc of Nd123 powder. The influence of oxygen partial pressure on Tc is large when the percentage of Nd422 in Nd123 is small. When the percentage of Nd422 is higher, the effect of pressure could be neglect. To the MTG Nd/Au bulk, the superconducting properties are very sensitive to oxygen partial pressure. First, the vacuum MTG process adopting 1 torr oxygen partial pressure could produce the bulk with higher Tc.

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23

Castillo, Oscar Eduardo Schwartz Justin. "Microstructural and superconducting properties of V doped MgB2 bulk and wires." 2004. http://etd.lib.fsu.edu/theses/available/etd-04072004-150501.

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Thesis (M.S.)--Florida State University, 2004.<br>Advisor: Dr. Justin Schwartz, Florida State University, College of Engineering, Dept. of Mechanical Engineering. Title and description from dissertation home page (viewed June 17, 2004). Includes bibliographical references.

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24

"Mechanical and superconducting properties of bulk bismuth superconductors at various processing stages." 2000. http://library.cuhk.edu.hk/record=b5890301.

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by Yu-Kit Lam =鉍系超導體在各製備階段之機械及超導特性 / 林宇傑.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2000.<br>Includes bibliographical references.<br>Text in English; abstracts in English and Chinese.<br>by Yu-Kit Lam = Bi xi chao dao ti zai ge zhi bei jie duan zhi ji xie ji chao dao te xing / Lin Yujie.<br>Table of Contents --- p.i<br>Acknowledgments --- p.iv<br>Abstract --- p.v<br>Chapter Chapter 1 --- Related Work on Bulk Bi-based High Tc Superconductor --- p.1<br>Chapter 1.1 --- Historical Background of Superconductivity --- p.1<br>Chapter 1.2 --- Basic Properties of Superconductivity ---

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25

Yu-ChengShih and 施昱丞. "Study of Magnetic Drug Delivery System Using High Temperature Bulk Superconducting Magnet." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/bjwn4m.

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26

WU, JUN-YUAN, and 吳俊元. "The study of Bi(Pb) Sr-Ca-Cu-O-superconducting bulk and film." Thesis, 1991. http://ndltd.ncl.edu.tw/handle/63130478491067031740.

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27

Lin, Li-Fan, and 林麗芳. "Ambient-pressure preparation and characterization of bulk and hin film of superconducting YBa2Cu4O8." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/71973627814436881539.

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28

JIN, KE-SHU, та 金克恕. "The study of YBa�浚u�記�f-y -Ag superconducting bulk and film". Thesis, 1992. http://ndltd.ncl.edu.tw/handle/77349440310973722162.

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29

LU, HSUEH CHUNG, and 呂學忠. "The study of Superconductive Properties for Al and MgB2 nanoparticles and bulk." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/66641523677229466725.

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碩士<br>輔仁大學<br>物理學系<br>89<br>The main purpose of this article is to study the size effect on superconductivity in aluminum and MgB2 nanoparticles. The bulk and nanoparticle specimens of aluminum and MgB2 were prepared by arc welder and thermal evaporator respectively. Their specific heat and magnetization were performed by using a micro-calorimeter and a SQUID. It was observed that the superconducting critical temperature (TC) of Al could be increased by reducing the size of particle. The consequence is conjectured to be related to the phonon softening and the enhancement of phonon-electro

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30

Lin, Li-Fang, and 林麗芳. "Ambient-pressure preparation and characterizations of bulk and thin film of superconducting YBaCuO." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/31253316261703388828.

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31

Archer, Jonathan Celvin. "Investigation into the synthesis and carbon doping of MgB₂for possible bulk superconducting fault current limiters application." Thesis, 2012. http://hdl.handle.net/10413/8954.

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Magnesium Diboride (MgB₂) bulk superconductor has been manufactured for use in superconducting fault current limiters (SFCLs) via in situ reaction. SFCLs have proven to be a viable means for limiting surge currents on power lines by dissipating fault energy as the superconductor quenches. As the current limiting behaviour is determined by the normal resistance (Rn), research has been conducted to evaluate an effective means to increase Rn for bulk superconducting MgB₂. Other researchers have previously looked into the improvement and optimisation of the critical current, Jc, by carbon doping a

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32

Nee, Chong-Sine, and 倪中興. "Effects of the composition of compensating bulk on the phase formation of Pb-doped Tl-based high-Tc superconducting thin films." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/43637271975544134738.

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碩士<br>國立交通大學<br>電子物理學系<br>85<br>Tl1Ba2Ca2Cu3O9-δ相(Tl-1223相)因為具有：1.相鄰兩單位晶胞內的銅氧層間距較短(~8.8A); 以及2.超導臨界溫度高(Tc~115-120K)的優點，故在應用潛力與超導性質的研究上均引起相當大的注意。但是1223相比起其他兩種鉈系高溫超導相，Tl-2223相和Tl-2212相，因為成長的條件範圍較為狹窄，使得製作過程中環境條件的控制較為嚴苛。本實驗在Tl-Ba-Ca-Cu- O系統中用鉛(Pb)取代部份的鉈(Tl)，並改變退火時補償塊材的成份以及熱處理條件來研究其對Tl-1223相形成之影響。以起始組成計量比接近於1223的薄膜作為先驅膜，使用計量比為TBCCO-2223的塊材作為熱處理時的補償，改變不同的氧氣壓力範圍，可以製作出接近純相的Tl-2223及 Tl-2212相薄膜。接著由製作出2223相的條件中，降低基板的溫度，製作出純相的1212相的薄膜。然後藉著改變補償塊材中鉈的含量

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33

Wang, Jyh-Lih. "Study of current limiting mechanisms in Bi-Sr-Ca-Cu-O superconducting tapes by electromagnetic and microstructural characterization of bulk scale bicrystals." 1996. http://catalog.hathitrust.org/api/volumes/oclc/35677796.html.

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34

早川, 直樹, 仁. 大久保, 克巳加藤 та Klaus-Peter Juengst. "高温超伝導バルク導体を用いた超伝導限流変圧器の開発に関する研究". 2004. http://hdl.handle.net/2237/13122.

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