By A. M. Campbell (auth.), Prof. Dr. Hisao Hayakawa, Dr. Naoki Koshizuka (eds.)

ISBN-10: 4431681957

ISBN-13: 9784431681953

ISBN-10: 4431681973

ISBN-13: 9784431681977

Five years have handed because the leap forward within the severe temperature for superconductors. in this interval, many superconducting fabrics were came across and built, and our wisdom of the actual and different homes of oxide superconductors has deepened via huge and extensive examine. this information has complex superconductivity technology and know-how from the preliminary wondering level to a extra constructed yet nonetheless doubtful moment degree the place study job in superconductivity now overlaps with fields of program. regularly conversing, technology resonates with expertise. technological know-how not just enhances but additionally competes with or stimulates expertise. New medical wisdom has caused the second one technological examine degree. a lot development has been made within the improvement of sensible units, encouraging the applying of superconductors in parts similar to human levitation, a excessive velocity levitated bearing, huge present reworking leads, and excessive frequency units. This technological growth has elevated our realizing of the technology concerned, similar to flux pinning and dynamics, and anomalous long-range superconducting interactions. At this significant degree, overseas cooperation and collaborative initiatives can successfully maintain competitive examine and improvement with a view to enhance superconductivity to the following levels. The ISS Symposium is anticipated to function a venue for expanding our wisdom of superconductivity and for changing visions for destiny learn and functions, during the presentation and discus­ of the newest examine effects. those complaints additionally goal to summarize sion annual growth in high-Tc superconductivity in all fields.

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Additional resources for Advances in Superconductivity IV: Proceedings of the 4th International Symposium on Superconductivity (ISS ’91), October 14–17, 1991, Tokyo

Example text

Such a storage system has virtually no losses, allowing the recovery of 95% of the input, and would tolerate a wide range of charge/discharge rates. Further, it would have an unlimited cycle life. The specific energy, which is limited by the forces that the field exerts on the conductor, has been estimated at near 50 W-hrs/kg, which is competitive with NiH2 batteries. 15 Presently most space systems depend on photovoltaic arrays for primary electrical power and with increased power demands the arrays can reach large sizes.

The large energy gap means that both analogue and digital systems should work ten times faster than with Niobium technology. The upper critical field is ten times higher and we have already seen thin fUms which carry 106 Ncm 2 in fields of 5T at 77K, with useful current densities at much higher fields.. 2K and indicates the possible power density of a motor built with this material. The rate of progress has been much faster than that of conventional materials but the problems that remain in realising this potential are not easily solved.

A Comparison of Inter and Intra grain Critical Currents in Co Doped YBCO. Figure 7. An Illustration of how plastic flow could smooth grain boundaries It is important to look at different materials to try to get some clues. Figure 6 shows the effect of Cobalt doping. It is found that both inter and intra grain critical current densities vary in a similar way with doping. This is presumably because if nothing else is changed both are determined by the same microscopic parameters. changing y reduces the number of holes taking it from a more metallic type of material to a semiconducung one.

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Advances in Superconductivity IV: Proceedings of the 4th International Symposium on Superconductivity (ISS ’91), October 14–17, 1991, Tokyo by A. M. Campbell (auth.), Prof. Dr. Hisao Hayakawa, Dr. Naoki Koshizuka (eds.)


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