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Matsunaga, Takeshi; Tsuzuki, Katsunori; Yanase, Nobuyuki; Hanzawa, Yukiko; Naganawa, Hirochika; Inoue, Takanobu*; Yamada, Toshiro*; Miyata, Akifumi*
Proceedings of International Symposium on Environmental Modeling and Radioecology, p.243 - 246, 2007/03
The aim of this work is to obtain a fundamental scheme of stream discharge of inorganic toxic materials derived from Characteristics of the stream discharge of metallic elements were investigated in two forested catchments in the Oda River and the Ijira River watersheds. Precipitations, stream water and soil water samples were collected in raining events and were analyzed for inorganic elements, dissolved organic carbon and isotopic abundance of deuterium. Results revealed an accelerated discharge of specific metals of Cu, Sb and Cr and all the studied REE in dissolved form. This feature was commonly found in the two catchments. The specific metals are strongly suspected to be of anthropogenic origin. An analysis of hydrological discharge, using chemical and isotopic tracers, suggested that the increased discharge of the metals originate from their deposits on the ground surface and/or instantaneous resuspension of stream sediment. Contrary, REE discharge was tightly coupled with that of dissolved humic substances.
Nakama, Shigeo; Yamada, Atsuo; Aoki, Toshiro; Sato, Toshinori
Saikuru Kiko Giho, (26), p.77 - 86, 2005/03
Focusing on the cover layer materials (as the Radon Barrier Materials), which could have the effect to restrain the radon from scattering into the air and the effect of the radiation shielding, we produced the radon barrier materials with crude bentonite on an experimental basis, using the rotary type comprehensive unit for grinding and mixing, through which we carried out the evaluation of the characteristics thereof.
Al superconductors for International Thermonuclear Experimental Reactor (ITER)Yamada, Yuichi*; *; *; *; *; *; *; Koizumi, Norikiyo; Ando, Toshiro; Matsui, Kunihiro; et al.
Cryogenics, 39(2), p.115 - 122, 1999/00
Times Cited Count：39 Percentile：83(Thermodynamics)no abstracts in English
Yamada, Toshiro*; Morikawa, Hiroshi*; Ishida, Masatoshi*; Seto, Yutaka*; Yamamoto, Yoshifumi*; Sawamoto, Yoshikazu*
JNC TJ8410 98-002, 124 Pages, 1998/11
On the 11st of March 1997, a fire and explosion occurred in a Bituminization Demonstraion Facility. It subsequently became necessary to estimate the explosive force of this event. To this end, this report evaluates the static yield and ultimate strength of the main structural walls and floors of this facility. A simple method and a Finite Element Method (FEM) were considered to evaluate the yield and ultimate strength of reinforced concrete (RC) slabs. Using the simple method, the yield strength can be estimated effectively by solution of fundamental differential equations. The ultimate strength of RC slabs is tried to estimate using a modified yield line theory which is taken an arch effect created within RC slabs into account. However, this method is difficult to apply to slabs with complicated boundary conditions. In this case, FEM is necessary. The validity of the simple method is verified by analyzing some slabs using both methods and comparing the results. Previous experimental results and some RC slabs in the Asphalt Bituminization Facility were evaluated on the basis of yield and ultimate strength using both methods, and the validity of both methods were verified. Especially, in simulating previous experiments, the error in the estimated values of the ultimate strength using simple method to experimental values were within 30%. The estimated values of the ultimate strength using the FEM were 15% larger than the experimental values. As a result, the simple method taking arch effect into account was verified to some extent.
Yamada, Toshiro*; Ishida, Masatoshi*; Sawamoto, Yoshikazu*
PNC TJ8100 97-001, 83 Pages, 1997/11
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Tsuzuki, Katsunori; Matsunaga, Takeshi; Inoue, Takanobu*; Miyata, Akifumi*; Yamada, Toshiro*
no journal, ,
no abstracts in English
Tsuzuki, Katsunori; Matsunaga, Takeshi; Inoue, Takanobu*; Yamada, Toshiro*
no journal, ,
no abstracts in English
Yamada, Raiki*; Takahashi, Toshiro*; Nagata, Mitsuhiro; Ueda, Hayato*
no journal, ,
Oligocene-Miocene volcanic rocks distributed in the Toyama Sedimentary Basin of the SW Japan Arc are important for clarifying the temporal evolution of subduction zone volcanic activity during back-arc expansion. In this study, we report zircon U-Pb dates, zircon chemical compositions (trace elements and Hf isotopes), and whole rock compositions (major and trace elements, Sr-Nd isotopes). As a result of each analysis, the ca.23 Ma alkali-series rhyolite shows an isotopic composition that supports its high fertility, and is interpreted as magma that has dissolved the continental crust. The 18-17 Ma igneous activity varied from andesite to rhyolite. This magma diversity is thought to involve melting of the mantle saturated with slab fluids and partial melting of the mantle contaminated with slab melt.
