1:50,000 Quadrangle Geological Map of "Ikeda"; The Geology of the area where a world-class fault system runs

Noda, Atsushi*; Miyazaki, Kazuhiro*; Mizuno, Kiyohide*; Nagata, Mitsuhiro

GSJ Chishitsu Nyusu, 10(9), p.207 - 213, 2021/09

This paper is a brief explanation of the 1:50,000 Quadrangle Geological Map of "Ikeda". The geology of the Ikeda district which is located in the northern part of Shikoku, is divided into basement Late Cretaceous plutonic, metamorphic, and sedimentary rocks, and covering Post-Miocene volcanic and sedimentary rocks. This area is known for the distribution of the Median Tectonic Line, which is the major geological fault in Japan. This map is not only geologically important, but also important from a disaster prevention perspective.

CT injection experiment in JFT-2M

Ogawa, Hiroaki; Ogawa, Toshihide; Tsuzuki, Kazuhiro; Kawashima, Hisato; Kasai, Satoshi*; Kashiwa, Yoshitoshi; Hasegawa, Koichi; Suzuki, Sadaaki; Shibata, Takatoshi; Miura, Yukitoshi; et al.

Fusion Science and Technology, 49(2), p.209 - 224, 2006/02

https://doi.org/10.13182/FST06-A1096

no abstracts in English

Perform Test of a Directional Borehole Rader

Nagata, Kazuhiro*; Kajikawa, Kazahiro*; Mizuochi, Yukihiro*

JNC TJ7420 2003-001, 51 Pages, 2003/02

JNC-TJ7420-2003-001.pdf:4.8MB

Directional borehole rader (DBRD) measurements and core description were carried out and the reliability of fracture orientations determined by DBRD was discussed. DBRD ran into the borehole (01MS-06, depth 400m) drilled at the Syobasama site and 17 fractures were detected. 10 fracture orientations were determined from those fractures. Reflection waves from amother borehole (MIU-2) located about 14m away from 01MS-06 borehole were not detected, so the reliability of orientation could not be evaluated quantitatively. Judging from the result of a laboratory experiment, wa conclude that the error of fracture orientations determined by DBRD, in case of clearly observed reflector planes, would be within the range of plusmn 10 deg. in this work. Comparing DBRD reflector plane with fractures obtained by the core logging, it is found that the reflection occurs from fractured zone of rock mass. DBRD measurements with directional antennas having sufficient resolution are applicable to ...

Sputtering and plasma exposure to fabricate gold nanoparticles with clean surfaces

Kawaguchi, Kazuhiro; Sanari, Takumi*; Takahiro, Katsumi*; Yamamoto, Shunya; Yoshikawa, Masahito; Nagata, Shinji*

no journal, , 

Silver (Ag) and gold (Au) nanoparticles have strong optical extinction band due to localized surface plasmon resonance (LSPR) in the visible range. These nanoparticles on transparent substrates are being applied to chemical and biological sensors, in which changes in the LSPR features, including resonance wavelength, width and intensity, are observed. In such applications, an intense and sharp absorption band is required for higher detection sensitivity. Our previous work showed that a plasma treatment could be an effective tool to control the LSPR features for Ag nanoparticles prepared by sputter deposition. In the treatment, argon (Ar) plasma cleans up impurities adsorbed on the Ag nanoparticles, resulting in the blue shift and sharpening of the LSPR. In the present work, sputter deposition, and plasma have been employed to fabricate Au nanoparticles with desired optical properties for plasmon-based sensors.

Optical property of gold nanoparticles modified by plasma exposure and sputtering

Kawaguchi, Kazuhiro; Takahiro, Katsumi*; Yamamoto, Shunya; Yoshikawa, Masahito; Nagata, Shinji*

no journal, , 

Optical absorption due to localized surface plasmon resonance (LSPR) of Au nanoparticles (Au NPs) is being applied to optical chemical sensors. In this work, ion sputtering and plasma cleaning have been employed to control the LSPR absorption. Au NPs on quartz and Si substrates were fabricated by RF magnetron sputtering method. The samples were characterized by UV-Vis extinction spectroscopy, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS). The peak position of LSPR absorption was shifted toward shorter wavelength after ion irradiation and plasma treatment. The SEM observation revealed that the average size of Au NPs did not change before and after ion irradiation and plasma treatment. The XPS analysis showed that the blue-shift of LSPR absorption was resulted from the elimination of hydrocarbons adhered on particle surfaces. We concluded that plasma and ion sputtering treatments are effective method to obtain Au NPs with clean surfaces.