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Shirato H.,Tohoku Gakuin University | Wu G.,Tohoku Gakuin University | Oikawa S.,Yurtec Corporation | Sisido H.,Tohoku Electric Power Co.
2010 International Conference on Power System Technology: Technological Innovations Making Power Grid Smarter, POWERCON2010 | Year: 2010

Recently, power systems are being operated under increasingly stressed conditions, and the ability to maintain the system stability becomes an extremely critical concern. A Superconducting Generator (SCG) can be one of the ways to obtain higher stabilities, higher power density and higher efficiencies in the near future power systems. In this paper, SCG with high response excitation, which is indicated to have the potential of improving the system stability by its SMES (Superconducting Magnetic Energy Storage) effect, is studied by conducting digital simulation. A SCG model taking consideration of its detailed generator excitation circuits that influences considerably the SMES effect is proposed and completed in this work, and the excitation characteristics of SCG with high response excitation are investigated and clarified. The Simulation results have verified the SMES effect and revealed the reason why this effect can be obtained, furthermore, the influence on power system stability of SCG and the impact of its control system on its stability enhancement have been studied as well. ©2010 IEEE. Source


Akai H.,Yurtec Corporation | Tochihara Y.,Kyushu University | Ishimatsu S.,University of Occupational and Environmental Health Japan | Kusakari H.,Yurtec Corporation | And 4 more authors.
Journal of Environmental Engineering | Year: 2010

There are increasing reports of the evidence of Legionellosis. More rapid inspection of Legionella is necessary for minimizing damage to civilians. In this respect, on-site inspection method is required. This report provides the new method which can achieve on-site inspection of Legionella in water by combining the capture beads concentration and immunochromatography detection. In the concentration method, the beads which capture Legionella is used, and large volume sample (over 10 L) is treated by peristaltic pump. Beads concentration method can be also applicable for culture method and detection by polymerase chain reaction (PCR). The new method provides the practical solution for on-site legionella inspection. Source


Kusakari H.,Yurtec Corporation | Fukui K.,Tohoku Bunka Gakuen University | Okada S.,Tohoku Bunka Gakuen University | Akai H.,Yurtec Corporation | Maeda N.,Tohoku Bunka Gakuen University
Journal of Environmental Engineering | Year: 2012

Fat splitting equipment was applicable or performed basic research and demonstration in grease interceptor. In the basic research, operation of the fat splitting equipment was divided into five kinds, and, as a result, operation of ozone aeration and aeration and the Microbial enzyme was effective in the fat splitting. Fat splitting equipment was moved, and, in demonstration (1), grease drifted to the grease interceptorofthe be working from a result, grease interceptor. Fat splitting equipment was moved, and, in demonstration (2), a result, grease dissolved in not working grease interceptor. The fat splitting equipment was inapplicable in grease interceptor. It is tested in grease interceptor in other Microbial enzyme in future. Source


Akai H.,Yurtec Corporation | Aonuma T.,SHIROGUCHI Co. | Okada S.,Tohoku Bunka Gakuen University | Maeda N.,Tohoku Bunka Gakuen University | Kusakari H.,Yurtec Corporation
Journal of Environmental Engineering | Year: 2010

Recently, the accidents caused by Legionella species have became a serious problem at public baths. To solve the problem, it is necessary to keep the residual chlorine in water at predetermined level by disinfectant. In this study, we aimed to understand the situation of chlorine disinfectant decrease in air bubble bath and ultrasonic bathtub. As the experiment conditions, we controlled to change water depth, amount of air, water temperature, volume of circulating water, gauge of air nozzle, and so on. In order toevaluate the behavior of disinfectant in water, the divergent coefficient was used to observe the decrease in the level of disinfectant over time. Regarding of the behavior of disinfectant in water in the bubble air bathtub and Whirlpool bathtub, the results wereobtained respectively. Source

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