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Journal Articles

Structural basis for the fast phase change of Ge$$_{2}$$Sb$$_{2}$$Te$$_{5}$$; Ring statistics analogy between the crystal and amorphous states

Kohara, Shinji*; Kato, Kenichi*; Kimura, Shigeru*; Tanaka, Hitoshi*; Usuki, Takeshi*; Suzuya, Kentaro; Tanaka, Hiroshi*; Moritomo, Yutaka*; Matsunaga, Toshiyuki*; Yamada, Noboru*; et al.

Applied Physics Letters, 89(20), p.201910_1 - 201910_3, 2006/11

 Times Cited Count:204 Percentile:97.89(Physics, Applied)

The three-dimensional atomic configuration of amorphous Ge$$_{2}$$Sb$$_{2}$$Te$$_{5}$$ were derived by reverse Monte Carlo simulation with synchrotron-radiation X-ray diffraction data. The authors found that amorphous Ge$$_{2}$$Sb$$_{2}$$Te$$_{5}$$ can be regarded as "even-numbered ring structure", because the ring statistics is dominated by four- and six-fold rings analogous to the crystal phase. On the other hand, the formation of Ge-Ge homopolar bonds in amorphous GeTe constructs both odd- and even-numbered rings. They believe that the unusual ring statistics of amorphous Ge$$_{2}$$Sb$$_{2}$$Te$$_{5}$$ is the key for the fast crystallization speed of the material.

Journal Articles

Report of the 18th Symposium on Fusion Technology(SOFT)

Akiba, Masato; ; Okuno, Kiyoshi; Ohara, Yoshihiro; Kimura, Toyoaki; ; Takatsu, Hideyuki; Tanaka, Satoru*; Ninomiya, Hiromasa

Purazuma, Kaku Yugo Gakkai-Shi, 70(10), p.1127 - 1130, 1994/10

no abstracts in English

JAEA Reports

JAEA Reports

A Single Null Poloidal Diverter Experiment in Doublet-III; Doublet-III Experimental Report, 2

; ; ; ; ; Ohara, Yoshihiro; ; ; ; ; et al.

JAERI-M 8983, 17 Pages, 1980/08

JAERI-M-8983.pdf:0.66MB

no abstracts in English

JAEA Reports

JFT-2 Tokamak Neutral Injector and Preliminary Results of Additional Heating Experiment

; ; ; ; ; ; ; ; ; ; et al.

JAERI-M 7043, 27 Pages, 1977/04

JAERI-M-7043.pdf:0.58MB

no abstracts in English

Oral presentation

Seepage flow analysis during earthquake on jointed rock mass using multiple yield models

Horikawa, Shigeo*; Sasaki, Takeshi*; Koshigai, Masaru*; Fukushima, Shigeru; Ohara, Yoshiyuki

no journal, , 

no abstracts in English

Oral presentation

Earthquake response analysis of a mine rubble deposit sites using NMM+DDA coupled analysis

Horikawa, Shigeo*; Sasaki, Takeshi*; Koshigai, Masaru*; Fukushima, Shigeru; Ohara, Yoshiyuki

no journal, , 

Oral presentation

Stability of a mine rubble deposit in earthquakes using NMM + DDA coupled analysis

Sasaki, Takeshi*; Horikawa, Shigeo*; Koshigai, Masaru*; Fukushima, Shigeru; Ohara, Yoshiyuki

no journal, , 

no abstracts in English

Oral presentation

Groundwater colloid properties in sedimentary rocks; Preliminary results from the Horonobe URL

Sasamoto, Hiroshi; Ohara, Shigeru*

no journal, , 

In the present study, a non-destructive technique using Particle Tracking Analysis (PTA) has been tested to determine size distribution and concentration of colloids in groundwater. The groundwaters were sampled from water-rings (4 samples) located in the vertical shafts and boreholes (6 samples) drilled in the drifts of the Horonobe URL. Results suggest that colloid particle concentrations range from 9.1$$times$$10 $$^{6}$$ to 7.8$$times$$10 $$^{8}$$ particle/mL (pt/mL) and the estimated colloid mass concentrations range from 3.4$$times$$10 $$^{-2}$$ to 4.2 mg/L for the diameter of 1 to 1000 nm, respectively. Colloid concentrations of groundwater sampled from water-rings are generally higher than those sampled from boreholes due to differences in groundwater sampling conditions. For sizes $$>$$ 100 nm of particles, colloid stability was evaluated on the basis of DLVO theory. DLVO theory predicts that particle sizes $$>$$ 100 nm would be unstable (i.e., coagulation could occur). Particle and mass colloid concentrations in the groundwater were therefore reevaluated to obtain the reliable colloid particle concentrations range from 5.8$$times$$10 $$^{6}$$ to 3.0$$times$$10 $$^{8}$$ pt/mL and colloid mass concentrations range from 2.0$$times$$10 $$^{-3}$$ to 1.3$$times$$10 $$^{-1}$$ mg/L for the diameter range $$<$$ 100 nm, respectively. Furthermore, the reevaluated results indicate a negative correlation between colloid concentrations and IS of groundwater.

Oral presentation

Seismic response analysis for foundation of tailing dam on discontinuous rock mass

Horikawa, Shigeo*; Sasaki, Takeshi*; Koshigai, Masaru*; Fukushima, Shigeru; Ohara, Yoshiyuki

no journal, , 

no abstracts in English

Oral presentation

Seismic response analysis of tailing dam foundation on discontinuous rock masses and counter measure design

Sasaki, Takeshi*; Koshigai, Masaru*; Horikawa, Shigeo*; Fukushima, Shigeru; Ohara, Yoshiyuki

no journal, , 

Oral presentation

Case study of earthquake response analysis of a mine rubble deposit sites using NMM+DDA coupled analysis

Horikawa, Shigeo*; Sasaki, Takeshi*; Koshigai, Masaru*; Fukushima, Shigeru; Ohara, Yoshiyuki

no journal, , 

no abstracts in English

12 (Records 1-12 displayed on this page)
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