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Showing 1 to 15 of 15 for “"Flux flow"”.
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Magnetic Flux Flow and Fluctuation Effects in Thin Film Superconductors
Made available in DSpace on 2015-05-12T22:38:40Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7114741.PDF: 2525444 bytes, checksum: ee8366003a488cf0eb3bbac8b1894ba1 (MD5) Previous issue date: 1970
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Magnetic flux flow and fluctuation effects in thim film superconductors
Critical state measurements of single and binary thin film systems have been measured as a function of transport current density, magnetic field, temperature, and degree of annealing. Results are interpreted in terms of the present understanding of the mixed state in thin films. Studies of vorteK …
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Caracterização de fitas supercondutoras 2G HTS em regime de Flux flow
… Superconductor (2G HTS) tapes beyond the Flux Creep regime. Since the value of N is extremely sensitive to the HTS tape temperature, the attention was held for ways to minimize the tape temperature oscillation during V-I measurements. First, a special copper sample holder was designed for …
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A superconducting memory switch based on the principles of flux-flow resistivity
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1989.
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Magnetotransport in superconductor to semiconductor junctions: multiple Andreev reflections and coupling to quantum hall states
… properties. Both exhibit dissipationless current flow as well as strong electron correlations which can lead to a new ground state charge carrier. In this work, coupling between superconductors and 2DEGs was studied. Using band structure engineering as well as InGaAs and InAs caps, junctions were …
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Modelling and experimental studies of the magnetic properties of bulk high temperature superconductors
… from their ability to trap magnetic field by flux pinning ( often described by the Bean model) and their Jc-B (the Kim model) and E-J characteristics (the flux flow resistivity model and the power law model). Chapter 2 relates the properties of bulk superconductors, and especially those …
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Dynamic Resistance of High-Tc Superconductor and Its Application in Flux Pumped Superconducting Magnets
… accelerators, and magnetic levitation systems. Flux pumping is a promising technology for energizing and operating High-Tc superconducting magnets in a relatively cost effective manner. This thesis first presents a thorough study on the dynamic resistance, the key driving force of the flux …
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Josephson Effects in the Iron-Based Superconductor FeTe$_{1-x}$Se$_{x}$
… applied RF irradiation, which likely arises from flux flow and a phase slip line in FeTe$_{1-x}$Se$_x$. The second signature was the emergence of sudden jumps in the DC current at which Shapiro steps arise, as a function of applied RF power. This was measured by mapping $\frac{dV}{dI}$ vs DC …
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Diffusion in pulsating flow in a conduit
… study is to determine the effect of oscillating flow in a conduit in the absence of secondary flow on the rate of mass transfer to the wall, and the parameters that influence the magnitude of the change in the flux. Flow in an artery is pulsatile in nature and it will be shown in a later section …
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Correlation lengths, disorder, and dynamics of vortex matter as heard through the noise
… have conducted a series of experiments measuring flux-flow voltage noise in the type II superconductor 2H-NbSe₂ concentrating on the dynamics and possible phase transitions of vortex matter associated with the peak-effect. I emphasize five conclusions: (1) Traditional models of vortex dynamics …
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New structure of dual stator hybrid excitation flux switching motor for aircraft applications
… impact. New electric driven system such as flux switching machine (FSM) has been developed which is capable to meet these requirements as well as providing significant technical and economic improvements over conventional systems. However, FSMs with single stator associated with limited free …
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The Electronic Properties of Thin Film YBa2Cu3O7 Low Angle Grain Boundaries
… plane, dissipation is dominated by the viscous flux flow of vortices along the boundary. Clear evidence for this is found in the V-I characteristic, which displays an increased linearity indicative of the viscous regime. It is shown that the number of vortex rows involved in the flow process can …
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The Fabrication of Josephson Junctions with an Electron Beam
… temperatures, the current voltage curves become flux-flow like. In the small junction limit the microwave power dependence is also that predicted by the resistively shunted junction model. The critical current as a function of magnetic field has a dependence which is very Fraunhofer like for all …
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Realisation of De Gennes’ Absolute Superconducting Switch and Magnetic Exchange Field Effects at Metallic and Superconductor Interfaces
… (SOT) microscopy. An asymmetry in vortex flux flow is demonstrated and manipulated by fringing fields generated by EuS, which causes a non-reciprocity of the critical supercurrent density, i.e., we observe a superconducting diode-like effect. Next, we demonstrate the MEF effects at …
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Experimental study of flow boiling under subatmospheric pressures in a vertical square channel
… nucleation characteristics and Critical Heat Flux (CHF) in subcooled boiling flows under subatmospheric pressure. Forced convection boiling is a widely used and effective means of heat transfer. An understanding of the mechanisms and limitations involved in forced convection boiling is …