Topic
Shields
About: Shields is a research topic. Over the lifetime, 1456 publications have been published within this topic receiving 10896 citations.
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TL;DR: In this article, the magnetic field amplitude inside the superconducting shields was measured using Hall probes with a phase-sensitive technique, and the properties of the shields were characterized at varying field amplitude and frequency.
Abstract: High temperature superconducting materials (HTS) offer several advantages in magnetic field shielding applications. HTS materials have the potential of creating efficient shields by reducing the size and weight of the shielding systems. The main limitation until recently has been the difficulty of producing HTS tapes of large width. Recent developments in second-generation (2G) high temperature YBCO superconductors allow the production of 2G films on very large 4 cm wide substrates. Magnetic field shielding properties of coils and sheets fabricated from 4 cm wide YBa2Cu3O7-coated conductors are reported. Shielding properties of shields with multiple layers were measured at liquid nitrogen temperatures. Magnetic field amplitude inside the superconducting shields was measured using Hall probes with a phase-sensitive technique. Efficacy of the shields was characterized at varying field amplitude and frequency. Shielding of up to 95% of applied magnetic field was observed at magnetic field amplitudes of <10 mT. The frequency dependence of shielding properties depended on the geometry of the shields.
27 citations
Patent•
25 Apr 196027 citations
TL;DR: A review of the most widely used threshold curves that have followed from the original Shields curve over the last 80 years, and propose that in terms of physical processes the threshold (critical Shields parameter) is a function of at least six variables, i.e. grain Reynolds number, grain size distribution, sphericity, roundness, particle cohesiveness and the scale effects of turbulence as mentioned in this paper.
27 citations
Patent•
30 Sep 2004
TL;DR: In this article, the authors proposed a method for detecting radial flows of conductive fluid by using a shield to prevent or reduce circulating electrical currents from causing a voltage difference that would adversely affect the measured voltage difference between two adjacent electrodes.
Abstract: Methods and apparatuses for detecting radial flows of conductive fluid are provided. In an embodiment of the present invention, shields are used to prevent or reduce circulating electrical currents from causing a voltage difference that would adversely affect the measured voltage difference between two adjacent electrodes. The shields may be a conduit through which conductive fluid may flow. Groups of sensors, e.g., two or more, may be placed within the shield. The shields may have any cross-section shape. Generally, once the circulating electrical current flow between the electrode pairs is substantially reduced or eliminated, only the voltage difference from the localized induced electric field remains. This way, a true induced voltage may be measured, and thus an accurate value for the fluid velocity may be determined.
27 citations
TL;DR: In this article, the authors describe numerical simulations, using thermal networks, of shield temperatures and radiative and conductive heat losses of a super-insulated cryogenic storage tank operating at 77 K.
27 citations