Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 17 of 17 for “"Bulk superconductors"”.
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Applications of Pulse-Magnetised Bulk Superconductors
… and microscopic examination of matter. Superconductors have proved to be the most economical form of generating magnetic fields when strong magnetic fields are required. In recent times, the (RE)BaCu3O(7-δ) [(RE)BCO] class of high-temperature superconductors in bulk form have been shown …
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Magnetisation of bulk superconductors for future light-weight electric motors
Bulk superconductors, in their capacity as trapped field magnets, offer a practical means of generating high magnetic fields in small volumes. This is desirable for applications in which portability is of primary concern. In particular, superconducting materials are seen as enablers leading towards …
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Improving the mechanical properties of Y-Ba-Cu-O single grain bulk superconductors
… the mechanical properties of single grain YBCO bulk superconductors without causing significant detrimental effects to the superconducting properties of the material. It is widely acknowledged that large single grains of GdBCO and SmBCO with silver can be batch processed successfully with …
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Improvement in the Growth and Superconducting Properties of Bulk Sm-Ba-Cu-O Superconductors Fabricated in Air
… 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 …
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Advanced Numerical Modelling of Bulk Superconductor Magnetisation
… volume, below a certain (critical) temperature. Superconductors can be subdivided into two classifications; type-I, or type-II, with the latter exhibiting a ‘mixed-state’ of superconductivity across their volume. Through appropriate magnetisation, magnetic flux may become ‘pinned’ within type-II …
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The mechanical properties of Y-Ba-Cu-O and Gd-Ba-Cu-O/Ag bulk superconductor magnets
Single-grain RE-Ba-Cu-O bulk high temperature superconductors [or (RE)BCO, where RE = rare earth element or yttrium] have demonstrated significant potential for practical applications due to their ability to trap magnetic fields in excess of 17 T, which is an order of magnitude greater than what …
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Modelling and experimental studies of the magnetic properties of bulk high temperature superconductors
… studies of the magnetic properties of bulk, single grain high temperature superconductors (HTS), such as RE-Ba-Cu-0 [(RE)BCO] where RE refers to a rare earth element, have been performed using a modelling framework developed in this study. This modelling framework can simulate the …
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The microstructure, mechanical and superconducting properties of (RE)BCO bulk single grains
High-temperature superconducting RE-Ba-Cu-O bulk single grains [(RE)BCO, where RE = Y, Gd, Eu, Sm or Nd] show a wide variability in their mechanical and magnetic flux trapping properties. These variations attribute primarily to variations in the microstructure of (RE)BCO bulk materials. While the …
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Processing and characterization of ceramic superconductor/polymer composites
… three decades. ! Some of the growth areas for bulk superconductors are applications that rely on the ability of the superconductor to exclude magnetic fields or shape electromagnetic waves, for example, levitated vehicles, motors, and magnetic shields. Additional research, development, and …
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Superconducting thin film nanoelectronics
… many of these devices rely on the properties of bulk superconductors, superconducting devices based on thin films are finding increasing application, especially in the realms of sensing and amplification. With recent advances in electron-beam lithography, superconducting thin films can be …
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Thin Film Approaches to The Srf Cavity Problem: Fabrication and Characterization of Superconducting Thin Films
… accelerator performance and efficiency – 1.5 GHz bulk niobium SRF cavities have achieved accelerating gradients in excess of 35 MV/m – there exist fundamental material bounds in bulk superconductors limiting the maximally sustained accelerating field gradient (approximately 45 MV/m for Niobium) …
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Driven Magnetic Flux Lines in Type-II Superconductors: Nonequilibrium Steady States and Relaxation Properties
… state of driven magnetic flux lines in type-II superconductors subject to strong point or columnar pinning centers and the aging dynamics of nonequilibrium relaxation process in the presence of weak point pinning centers. We employ a three-dimensional elastic line model and Metropolis Monte …
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Fluctuation contributions to the heat capacity of superconducting thin films
… this has ""been observed in experiments on pure bulk superconductors. The presence of thermodynamic fluctuations causes a breakdown of mean field theory if one gets close enough to the transition temperature, T. For a pure bulk superconductor, the temperature region over which thermodynamic …
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Electronic and lattice vibrational properties of thorium hydrides
The low temperature heat capacities of several bulk samples of Th4H15 and Th4D15 have been measured in the normal state over the temperature range from 1.4 to 20 K. Values of the electronic heat capacity coefficient, y, and the Debye temperature, eD' have been determined. No isotope effect upon the …
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Pulsed field magnetization of composite superconducting bulks for magnetic bearing applications
… 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 and weight reductions for rotating machines …
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A study of oxide superconductors by electron energy loss spectroscopy in STEM.
… insulator. In the production of bulk superconductors the oxygen anneal is therefore important in determining the properties of the sample. Studies on critical currents in bulk materials and single cystals have shown that the currents in the bulk materials are a factor of 10 less …
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Development of a Bulk Superconducting Magnet for Benchtop Nuclear Magnetic Resonance
Stacks of bulk high temperature superconducting (HTS) rings are promising candidates for the generation of the strong polarising fields required for nuclear magnetic resonance (NMR) when utilised as trapped field magnets (TFMs). To date, these stacks have been magnetised by the quasi-static field …