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Yanagisawa, Y.,Suetomi, Y.,Piao, R.,Yamagishi, K.,Takao, T.,Hamada, M.,Saito, K.,Ohki, K.,Yamaguchi, T.,Nagaishi, T.,Kitaguchi, H.,Ueda, H.,Shimoyama, J.,Ishii, Y.,Tomita, M.,Maeda, H. The Korea Institute of Applied Superconductivity a 2018 초전도와 저온공학 Vol.20 No.2
The present article briefly overviews the plan for a new project on joint technology for HTS wires/cables and describes the development plan for the world's highest field NMR magnet, which is a major development item in the project. For full-fledged social implementation of superconducting devices, high temperature superconducting (HTS) wire is a key technology since they can be cooled by liquid nitrogen and they can generate a super-high magnetic field of >>24 T at liquid helium temperatures. However, one of the major drawbacks of the HTS wires is their availability only in short lengths of a single piece of wire. This necessitates a number of joints being installed in superconducting devices, resulting in a difficult manufacturing process and a large joint resistance. In Japan, a large-scale project has commenced, including two technical demonstration items: (i) Development of superconducting joints between HTS wires, which are used in the world's highest field 1.3 GHz (30.5 T) NMR magnet in persistent current mode; the joints performance is evaluated based on NMR spectra for proteins. (ii) Development of ultra-low resistive joints between DC superconducting feeder cables for railway systems. The project starts a new initiative of next generation super-high field NMR development as well as that of realization of better superconducting power cables.
Graham, I.,Hamada, H.,Honda, T.,Kohr, G.,Shon, K.H. Academic Press 2014 Journal of mathematical analysis and applications Vol.416 No.1
Let X be a complex Banach space with the unit ball B. The family M is a natural generalization to complex Banach spaces of the well-known Caratheodory family of functions with positive real part on the unit disc. We consider subfamilies M<SUB>g</SUB> of M depending on a univalent function g. We obtain growth theorems and coefficient bounds for holomorphic mappings in M<SUB>g</SUB>, including some sharp improvements of existing results. When g is convex, we study the family R<SUB>g</SUB> consisting of holomorphic mappings f:B→X which have the property that the mapping Df(z)(z) belongs to M<SUB>g</SUB>. Further, we consider radius problems related to the family R<SUB>g</SUB>, when X is a complex Hilbert space. In particular, if X is the Euclidean space C<SUP>n</SUP>, we obtain some quasiconformal extension results for mappings in R<SUB>g</SUB>. We also obtain some sufficient conditions for univalence and starlikeness in complex Banach spaces.