著者

藤井 義明 児玉 淳一 福田 大祐

出版者

一般社団法人資源・素材学会

雑誌

一般社団法人資源・素材学会 平成31(2019)年度春季大会

巻号頁・発行日

2019-01-17

著者

高橋 慧 藤井 義明

出版者

一般社団法人資源・素材学会

雑誌

一般社団法人資源・素材学会 平成26(2014)年度 春季大会

巻号頁・発行日

2017-08-17

著者

藤井 義明 杉本 拓也 福田 大祐 児玉 淳一

出版者

一般社団法人資源・素材学会

雑誌

一般社団法人資源・素材学会 平成26(2014)年度 春季大会

巻号頁・発行日

2017-08-17

著者

武下 臣 伊藤 秀男 花上 康宏

出版者

一般社団法人資源・素材学会

雑誌

Journal of MMIJ (ISSN:18816118)

巻号頁・発行日

vol.123, no.12, pp.704-706, 2007-12-25 (Released:2010-12-17)

参考文献数

5

被引用文献数

2 5

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Yokkaichi plant of Mitsubishi Materials Corporation was established in 1968. The products are high purity polycrystalline silicon (polysilicon) for use in semiconductors. The productivity expanded from 1.5t/M up to 1800t/Y in 40 years. Hydrogen reduction of trichlorosilane on heated silicon rod, commonly called "Siemens' process", had progressed at Yokkaichi plant. The outline of the process is described.

著者

岡部 悠 Gandhi Muniyappan 芳賀 一寿 山田 学 柴山 敦

出版者

一般社団法人資源・素材学会

雑誌

一般社団法人資源・素材学会 平成30(2018)年度春季大会

巻号頁・発行日

2018-02-08

著者

米田 哲朗 前田 寛之

出版者

一般社団法人資源・素材学会

雑誌

Journal of MMIJ (ISSN:18816118)

巻号頁・発行日

vol.124, no.12, pp.694-699, 2008-12-25 (Released:2011-02-15)

参考文献数

28

被引用文献数

1 4

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Compositional and structural properties of clay minerals from hydrothermal systems show highly diverse and systematic variations related to their localities. The chemical compositions of chlorite, one of the most common clay minerals, are thought to have a close relationship with its formational environments such as geological conditions, temperature, chemistry of hydrothermal solution, etc. In this study two chlorite geothermometers were considered by using the chemical composition of chlorites from some hydrothermal ore deposits in Japan. The two chlorite geothermometers are the Cathelineau's thermometer giving an empirical temperature scale of chlorite formation in an active geothermal field, and the Walshe's thermometer giving a thermodynamic temperature scale based on exchange reactions of chlorite solid solutions. On the basis of a comparison of fluid inclusion geothermometry, it is concluded that the two geothermometers can be applied to different compositional types of hydrothermal chlorite. The Cathelineau's thermometer fits well for Mg-chlorite, and the Walshe's thermometer fits for Fe-chlorite, indicating that both two chlorite geothermometers can be used as exploration indicators for geothermal reservoirs and hydrothermal ore deposits. In addition, it must be emphasized that the impurities in the chlorite should be examined in applying the chlorite geothermometers to chlorites.

著者

中西哲也

出版者

一般社団法人資源・素材学会

雑誌

資源・素材2014(熊本)

巻号頁・発行日

2014-07-30

著者

名木 稔

出版者

一般社団法人資源・素材学会

雑誌

Journal of MMIJ (ISSN:18816118)

巻号頁・発行日

vol.123, no.12, pp.779-783, 2007-12-25 (Released:2010-12-17)

参考文献数

11

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In Japan, the domestic recycling system of the nonferrous metal is formed with two businesses. One is many collecting & sorting enterprises and processing & wholesale enterprises, which are usually small and medium-sized business. The other is nonferrous metal smelting & refining enterprises, which are usually big business. Recently legislative resource recycling system, which consists of Home Appliance Recycling Law, End-of-Life Vehicles Recycling Law, Law for Promotion of Effective Utilization of Resource and so on, has been also developed. But, in spite even in these circumstances, considerable amount of domestic occurrence scraps of copper has been exported to China, and a lot of used home appliances and used personal computers have been exported to foreign countries. Namely, it has become clear that the present resource recycling system could not circulate the resources sufficiently inside Japan.These problems were caused by rapidly increasing resource consumption of the world in these several years, which was originated by quick economic development of the Asian region, in especial in China. Tightness of worldwide resource demand has requested the advancement of creating new countermeasures and/or corresponding methods under the slogan of “conservation and effective utilization of resources” for a long time.This manuscript intoroduces these circumstances and suggested some solutions to the problems.

著者

田村 智樹 太田 光浩 児玉 淳一 吉田 豊

出版者

一般社団法人資源・素材学会

雑誌

Journal of MMIJ (ISSN:18816118)

巻号頁・発行日

vol.128, no.2, pp.65-71, 2012-01-25 (Released:2013-06-26)

参考文献数

14

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Recently, old narrow tunnels are reused by widening their sections for economic efficiency. New design concept will be required in their construction because excavation damaged zone (EDZ) might be already formed around old tunnels. Especially, estimation of EDZ extent is necessary for safe construction and stability assessment of a widening tunnel. In this study, EDZ around an old tunnel constructed in the Neogene soft rock seventy years ago was estimated based on P-wave velocity and observation of the face during widening. Deformation caused by widening the old tunnel was also measured. It was found that EDZ estimated by reduction in P-wave velocity was in good agreement with that estimated by observation of the face. It was also found that deformation of the widening tunnel was much less than that of either the old tunnel or a new tunnel constructed near the widening tunnel. In the widening tunnel, most of EDZ had been excavated and non-damaged zone outer side of the EDZ had been little excavated. It can be expected that deformation of a widening tunnel is little when the section size of that is almost equal to extent of EDZ.

著者

松木 浩二 狩野 祐一 坂口 清敏 木崎 彰久

出版者

一般社団法人資源・素材学会

雑誌

Journal of MMIJ (ISSN:18816118)

巻号頁・発行日

vol.126, no.12, pp.668-678, 2010-11-25 (Released:2011-11-25)

参考文献数

26

被引用文献数

1 1

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Using joint elements for a mechanical model of grain boundaries, we performed a preliminary 3D finite element analysis of uniaxial tensile fracture for specimen models of monomineral polycrystalline rock under the assumption that fracturing occurs only at the grain boundaries. The specimen models were created on a computer by the method previously proposed by the authors, and the constitutive law of the grain boundaries was derived by applying the associated flow rule in the plastic theory and a tension-shear-softening curve to an extended Coulomb criterion. Tensile fracturing initiates at grain boundaries with a small angle of the normal direction relative to the loading axis, which are followed by grain boundaries with a larger angle of the normal direction. Unloading of intergranular cracks occurs before the peak strength when the intergranular cracks do not compose the final failure plane that is completely formed near the inflection point of the axial stress-axial strain curve after the peak. During the completion of the final failure plane, the conversion of failure mode from tension to shear occurs at intergranular cracks that have a large angle of the normal direction relative to the loading axis. For these intergranular cracks, the axial displacement given at an end of the specimen is converted to a shear displacement, rather than an opening displacement, and the normal stress becomes to be compressive due to shear dilation. Furthermore, the number of tensile intergranular fracturing at the peak strength increases with a decrease in the constant α that characterizes the rate of decrease in the tensile strength in the tension-shear-softening curve of the grain boundaries, and as a result, the tensile strength of the rock specimen increases with a decrease in the constant α. However, the effect of the residual frictional coefficient is small and limited to the stage after the final failure plane is completely formed, since the residual friction coefficient affects the mechanical behavior of the grain boundaries only after the failure plane is completely formed.