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Fukuoka, Japan

The Kyūshū Electric Power Company provides power to 7 prefectures , and recently, to some parts of Hiroshima Prefecture. The shortened name of 九電 may sometimes be used. As of 2006, the image character was Chisato Moritaka. In 2011 the company was criticised for attempting to deceitfully manipulate public opinion in favor of reactivating two reactors at the Genkai Nuclear Power Plant. Wikipedia.

Oka T.,Niigata University | Seki H.,Niigata University | Kimura T.,Niigata University | Mimura D.,Niigata University | And 8 more authors.
Physica C: Superconductivity and its Applications | Year: 2011

A magnetic separation study for groundwater purification has been practically conducted by using the multi-pole magnet system. The magnetic pole was composed of 10 open magnetic spaces by arranging five HTS melt-processed bulk magnets in a line in a vacuum sheath. The individual bulk magnets were activated by feeding intense pulsed magnetic fields up to 6 T. The magnetic field distribution was estimated with respect to various pole arrangements. The actual groundwater samples of Sanjo City were processed so as to form large precipitates by adding the coagulant and pH controlling. The maximum separation ratio of the iron-bearing precipitates has exceeded over 70% when slurry water was exposed to 10 magnetic poles of up to 2.5 T at a flowing rate of less than 4.8 l/min. An obvious attraction of flocks to the magnetic poles was observed even when the water contains no magnetite powder at the flow rate of 1.01 l/min. This implies the validity of the multi-pole magnet system with respect to the actual application to water purification. © 2011 Elsevier B.V. All rights reserved. Source

Chen B.,Southwest University | Mokume M.,Kyushu Electric Power Co. | Liu C.,Kyushu University | Hayashi K.,Kyushu University
IEEE Sensors Journal | Year: 2016

Gas sensing characteristics of Au nanoparticles (AuNPs)/3-hexylthiophene-2, 5-diyl (P3HT) composite based on photocurrent detection under different irradiation wavelengths were investigated. AuNPs with different structures were prepared either by the vacuum sputtering/annealing method or by the wet chemical synthesis based on seed growth. AuNPs/P3HT composites were prepared by the dip coating method. The optical features of P3HT and Au nanostructure/P3HT composite were investigated. The optical absorption increase of AuNPs film was observed after P3HT coating, which was attributed to the interaction between the P3HT and the Au nano-islands. New shoulder peaks and the phenomenon of one spectral peak splitting into two were observed in the absorption spectra of the composite film, which confirmed the interaction between the AuNPs and the P3HT further. The photoconductivity characteristics of the P3HT and AuNPs with spectral peak position at 580-nm (AuNPs580)/P3HT composite films were investigated utilizing LED light source with different dominate wavelengths. The wavelength-dependent photocurrent change ratio I/I0 of both the P3HT and the AuNPs580/P3HT composite films was observed. The maximum I/I0 of the P3HT and AuNPs580 composite films emerged under LED irradiation with a dominate wavelength 590 nm, which was mainly ascribed to the antenna effect from the Au nano-islands, the carrier injection from nanostucture to P3HT, localized surface plasmon resonance coupling among Au nanostructures, and plasmon coupling between the Au nano-islands and the P3HT molecules. The response of Au nano-island/P3HT composite to ethanol vapor showed that the response and recovery time was shorter than 2 s. Furthermore, gas sensing characteristics were verified to be irradiation wavelength dependent. Irradiation light source with a dominate wavelength 590 nm produced the largest I/I0 1.07. © 2001-2012 IEEE. Source

Nainggolan J.M.,University of Miyazaki | Sakoda T.,University of Miyazaki | Hayashi N.,University of Miyazaki | Kurihara S.,Kyushu Electric Power Co. | And 3 more authors.
European Journal of Scientific Research | Year: 2011

Acoustic emission (AE) sensor was used for detection of electric discharges and diagnosing a joint section of T-branch cross-linked polyethylene (XLPE) cable for 22 kV distribution system. From the head of cable joint, three AE sensors were arranged at the cable surface clockwise at 1200 to each other, and each sensor connected to an amplifier unit. Three AE sensors were used to generate three-dimensional calculation. A high voltage electrode was inserted into the joint section of cable, and then high voltage was applied to generate partial discharge (PD). PD current was detected by a Rogowski coil. The AE signal from the amplifier unit was sent to a digital oscilloscope and recorded in a personal computer for further analyses using LabVIEW. The correlation between AE signal and PD current was clarified. The increase of AE signal has the same linear tendency with increasing PD current. Thereafter, estimated three-dimensional PD locations were found around the head part of joint section of XLPE cable. © EuroJournals Publishing, Inc. 2011. Source

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