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Volume 1987 (1987)
- Issue 131 Pages 161-
- Issue 130 Pages 101-
- Issue 129 Pages 59-
- Issue 128 Pages 2-
Volume 1987, Issue 130
Displaying 1-8 of 8 articles from this issue
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Kazuro Kawamura, Shiushichi Kimura, Eiichi Yasuda1987 Volume 1987 Issue 130 Pages 101-105
Published: July 25, 1987
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe morphological feature of carbon residues obtained by the detonation reaction of the compressed TNT, 40% PETN/60% DNN and 40% PETN/60% DNT mixtures was examined by spin concentration and X-ray parameters measurements, and also by electron microscopic observation.The carbon residues did not give a spherical appearance.From the morphology of the carbon residues before and after heat treatment it is supported that they are formed directly from atomic carbon vapour species without forming hydrocarbon droplets on their process.View full abstractDownload PDF (1351K) -
Shigeru Furukawa, Sugio Otani, Akira Kojima1987 Volume 1987 Issue 130 Pages 106-109
Published: July 25, 1987
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSCarbon fiber reinforced cements (CFRC) were prepared by arranging a small amount of carbon fiber (CF) paper only on one side of specimen. Water-reducing agent was added in the cement paste to make it easily impregnate into CF paper. Fluidity of the cement paste was remarkably advanced by the addition of the water-reducing agent.
CFRC plates (20mm in thickness) were prepared by the following process. A cement mortar layer of 2 mm in thickness was placed on the bottom of the mould first, and then 8 sheets of CF paper previously impregnated with cement paste (0.3in water-cement ratio) were put over it with the thickness of 2-3mm. Finally some more cement mortar (water-cement ratio: 0.4, sand-cement ratio: 1.0) was put over the CF-paper/cement paste layer, and then the whole specimen was placed in water for curing.
The mechanical properties of the prepared CFRC were remarkably improved by the addition of the water-reducing agent.The CFRC (0.7vol% in CF contents) prepared from the cement paste including water-reducing agent, showed 23 MPa in flexural strength and0.4mm in deflection, these values being 1.2 times and 4 times higher than those of CFRC without water-reducing agent, respectively.View full abstractDownload PDF (471K) -
Akira Yoshida, Yoshihiro Hishiyama1987 Volume 1987 Issue 130 Pages 110-117
Published: July 25, 1987
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSImportant factors to obtain a sharp secondary electron image for light element materials has been examined firstly. It has been found that in scanning electron microscopy there is an optimum acceleration voltage for the sample in observation to obtain the most sharp secondary electron image. The effective resolving power is defined in the present paper as that for the optimum acceleration voltage. Element carbon is a typical light element. SEM observation is an important method for studies of structures of carbon fibers. To get good cross sections of carbon fibers a method of cutting of the carbon fibers has been developed. With the same magnification photographs of secondary electron images for the same cross section of the carbon fiber have been taken with changing ac-celeration voltage between 1 and 40 kV. Similar photographs have been obtained for a fracture surface of a cast iron and a silicon microcircuit for comparison. The optimum acceleration voltage for a carbon fiber has been determined to be 2 kV. The effective resolving power for the carbon fiber has been estimated to be 0.05 jim with the optimum acceleration voltage of 2 kV. It has also been investigated the effect of metallic coating on the carbon fiber specimen.View full abstractDownload PDF (3366K) -
Tomoaki Hino, Toshiro Yamashina1987 Volume 1987 Issue 130 Pages 118-123
Published: July 25, 1987
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSAn isotropic graphite has been widely used for the first wall components of fusion devices as a high heat flux and stable material to plasmas. Since the atomic number of the carbon is low, the radiation loss from the plasma can be largely suppressed compared with metal impurities such as iron.It is known that the primary limiter and the armor tiles of Doublet III and the primary limiter of TFTR were made of POCO graphite and that those components were stable for the plasmas.It is required that the graphite used as the first wall components has low rates for outgassing, recycling and sputtering, high sublimation temperature and higher mechanical strength.This report describes the methods to satisfy these requirements, and examines the heat fluxes to the limiter and the armor tiles.View full abstractDownload PDF (829K) -
[in Japanese]1987 Volume 1987 Issue 130 Pages 124-135
Published: July 25, 1987
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (1736K) -
[in Japanese]1987 Volume 1987 Issue 130 Pages 136-144
Published: July 25, 1987
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (1405K) -
[in Japanese], [in Japanese]1987 Volume 1987 Issue 130 Pages 145-149
Published: July 25, 1987
Released on J-STAGE: June 28, 2010
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[in Japanese]1987 Volume 1987 Issue 130 Pages 150-153
Published: July 25, 1987
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (595K)
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