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Spatial structures of landforms as constants affecting vegetation patterns are discussed based on analyses of hilly land regions, mostly in the vicinity of Sendai, northeast Japan. The lower part of a hillslope is characterized by relatively active processes of soil erosion, landslides and slope failure. It supports a plant community different from that on(More)
We have newly developed a rice hull magnetic activated carbon (RH-MAC) and studied its adsorption property for humic acid from water and high-gradient magnetic separation (HGMS) characteristics. Rice hull was impregnated with an iron nitrate solution and heat-treated in both nitrogen and carbon dioxide atmosphere. In these processes, the rice hull changed(More)
We have studied the possibility of advanced water purification by using a high-gradient superconducting magnetic separation (HGSMS) with magnetic activated carbon. The purpose of this system is a high-speed removal of humic acid, other persistent organic matters and ammonia nitrogen from raw water without secondary wastes. We synthesized two types of(More)
Environmental pollution of mercury is growing into a serious problem on a worldwide scale. In particular, the toxicity of the mercuric compound like methylmercury is so high that the development of the purification technology is strongly demanded. In order to eliminate mercury efficiently from the aquatic environment, we have newly developed several kinds(More)
BiCh2-based compounds (Ch: S, Se) are a new series of layered superconductors, and the mechanisms for the emergence of superconductivity in these materials have not yet been elucidated. In this study, we investigate the relationship between crystal structure and superconducting properties of the BiCh2-based superconductor family, specifically, optimally(More)
It is known that both low angle grain boundaries and linear dislocation defects act as strong flux pinning centers in YBa/sub 2/Cu/sub 3/O/sub 7-x/ (YBCO) thin films achieving high critical current density J/sub c/. In this experiment, in order to effectively introduce such functional pinning centers, YBCO thin films were fabricated on (100) MgO substrates(More)
In order to increase critical current density J/sub c/ in ultrafine multifilamentary Nb-Ti superconducting wires for low-field a.c. applications, several kinds of Nb island-type artificial pinning centers (APC) were designed to produce high J/sub c/ in a low field region. Their pinning characteristics and a.c. losses were investigated. Effects of pin size(More)
The superconducting fault current limiter (SFCL) is a very attractive device for power networks, therefore, a lot of research and development has been conducted for several types of SFCLs. We have studied quench properties of QMG (quench melt growth) YBCO bulk elements for a resistive type SFCL. The bulk element has a high critical current density J/sub c/(More)
We have fabricated single core superconducting FeTe<sub>0.5</sub>Se<sub>0.5</sub> wires and tapes using a process based on a chemical transformation from hexagonal Fe(Te<sub>0.5</sub>Se<sub>0.5</sub>)<sub>1+d</sub>(nonsuperconducting) to tetragonal FeTe<sub>0.5</sub>Se<sub>0.5</sub> (superconducting) via an optimal supply of Fe from the Fe sheath by(More)
GdBa2Cu3O7-δ is one of the best candidates for the superconducting coated conductors because it has high critical temperature and high critical current density under high magnetic fields. In this study, superconducting GdBa2Cu3O7-δ films were fabricated by fluorine-free metal organic deposition method via two different calcination temperatures, 723K and(More)