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Journal Articles

Visualization technique with the energy-resolved neutron imaging system, RADEN

Kai, Tetsuya; Shinohara, Takenao; Hiroi, Kosuke; Su, Y.; Oikawa, Kenichi

Hihakai Kensa, 67(5), p.209 - 216, 2018/05

no abstracts in English

Journal Articles

Tomographic reconstruction of bolometry for JT-60U diverted tokamak characterization

Konoshima, Shigeru; Leonard, A. W.*; Ishijima, Tatsuo*; Shimizu, Katsuhiro; Kamata, Isao*; Meyer, W. H.*; Sakurai, Shinji; Kubo, Hirotaka; Hosogane, Nobuyuki; Tamai, Hiroshi

Plasma Physics and Controlled Fusion, 43(7), p.959 - 983, 2001/07

 Times Cited Count:25 Percentile:33.9(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Observation of detachment in the JET MkIIGB divertor usig CCD camera tomography

Itami, Kiyoshi; Coad, P.*; Fundamenski, W.*; Ingesson, C.*; Lingertat, J.*; Matthews, G. F.*; Tabasso, A.*

Journal of Nuclear Materials, 290-293, p.633 - 638, 2001/03

 Times Cited Count:5 Percentile:56.69

no abstracts in English

JAEA Reports

Density measurements of micro defects inside optical materials using a laser tomography method

Fukuyama, Hiroyasu*; Sugiyama, Akira

JAERI-Tech 2000-058, 33 Pages, 2000/11

JAERI-Tech-2000-058.pdf:5.98MB

no abstracts in English

JAEA Reports

None

*; *; Yabuuchi, Satoshi

JNC-TY7400 2000-001, 72 Pages, 2000/03

JNC-TY7400-2000-001.pdf:4.01MB

None

JAEA Reports

None

*; Aizawa, Takao*; *

JNC-TJ7420 2000-006, 54 Pages, 2000/03

JNC-TJ7420-2000-006.pdf:16.6MB

no abstracts in English

JAEA Reports

None

Nakashima, Satoshi*

PNC-TJ7725 98-001, 68 Pages, 1998/05

PNC-TJ7725-98-001.pdf:2.63MB

None

JAEA Reports

None

*; *; *; *; *; Negi, Tateyuki*

PNC-TJ1380 97-001, 1338 Pages, 1997/03

PNC-TJ1380-97-001.pdf:48.73MB

None

JAEA Reports

None

PNC-TY1569 98-001, 34 Pages, 1996/03

PNC-TY1569-98-001.pdf:2.03MB

None

JAEA Reports

None

*; *

PNC-TJ7393 96-001, 50 Pages, 1996/03

PNC-TJ7393-96-001.pdf:8.12MB

no abstracts in English

JAEA Reports

Investigations and numerical analysis at pre-excavation stage of machine excavation effects experiment

; ; ;

PNC-TN7410 94-049, 105 Pages, 1994/09

PNC-TN7410-94-049.pdf:4.57MB

Excavation of a shaft or a horizontal drift in a rock mass probably affects the rock mass around the openings. It is necessary in the design, construction and safety assessment of underground facilities to consider the properties and extent of the EDZ (Excavation Disturbed Zone; the zone where rock properties and rock conditions have been changed due to excavation). PNC has carried out the in-situ experiments in the Tono mine and has identified the controlling factors in the generation and extent of the EDZ due to blasting. In order to evaluate dependence of the generation and extent of the EDZ on excavation method, Machine Bxcavation Effects Experiment has been started. In FY 1992, a horizontal drift for measurements (measuring drift) was excavated. A horizontal drift parallel to the measuring drift (test drift) is scheduled to be excavated by a machine in FY 1994. The investigations and numerical analysis before excavation of the test drift were carried out in FY 1993. The objectives of the investigations and numerical analysis carried out in FY 1993 are as follows: (1)to measure and evaluate the rock properties and the rock conditions around the test drift before excavation, and (2)to predict by numerical analysis the displacements and stress change during excavation of the test drift. The investigations and numerical analysis in FY 1993 consist of the following items: (1)laboratory tests to measure the compressive strength, deformation modulus, seismic wave velocity, electric resistivity, and so on, (2)in-situ tests to estimate deformability and permeability, (3)borehole wall observation, (4)measurement of the initial stress, (5)seismic tomography and resistivity tomography, and (6)numerical analysis to predict the displacements and stress change by the Finite Blement Method. This report describes the details of these investigations and numerical analysis carried out in FY 1993.

JAEA Reports

None

Niimi, Ken; Osawa, Hideaki; Yanagizawa, Koichi; ; Yoshida, Hidekazu; Seo, Toshihiro;

PNC-TN7410 94-022, 190 Pages, 1994/03

PNC-TN7410-94-022.pdf:6.06MB

None

Journal Articles

Measurement of density distribution using optical tomography with genetic algorithm

*; Okamoto, Koji*; *; Fumizawa, Motoo

The 4th Triennial Int. Symp. on Fluid Control,Fluid Measurement,and Visualization; FLUCOME 94, 0, p.971 - 976, 1994/00

no abstracts in English

JAEA Reports

None

PNC-TJ7449 91-002, 580 Pages, 1991/05

PNC-TJ7449-91-002.pdf:21.34MB

no abstracts in English

JAEA Reports

Evaluation of excavation response in sedimentary rock mass

Sugihara, Kozo*; Ninomiya, Yasuo*

PNC-TN7410 90-009, 45 Pages, 1990/02

PNC-TN7410-90-009.pdf:1.73MB

Among many R&D categories for the performance assessment of geological disposal, it is very important to develop the techniques to measure and to evaluate the disturbed zone due to excavation. This study aimes to investigate the disturbed zone around the drift excavated in the sedimentary rock formation and to evaluate the accuracy, reliability and effectiveness of existing techniques for excavation, measurement and analysis for the use of the repository construction. For this purpose, a drift (2.5$$times$$2.5m, L=30m) was excavated by NATM. Rock mass displacement, rock bolt stress, permeability and pore water pressure were measured in and around the drift. Using this drift as measuring drift, a test drift (3.0$$times$$3.0m, L=20m) was excavated parallel to the measuring drift. As the supporting system of this drift only rock bolting was employed. In-situ measurement of rock displacement, elastic wave velocity, permeability and initial stress have been carried out. These results were compared with the predicted results to investigate the effectiveness of the existing evaluation techniques. Laboratory test results and geological mapping data were also used to understand the rock mass behavior and the disturbed zone around drift. These investigations revealed that low velocity zone of elastic wave was generated around the drift, and in the zone, permeability decreased and displacement increased. Rock mass movement was predicted roughly by numerical analysis based on the laboratory test results. And detailed numerical analysis considering the initial stress data and disturbed zone around the drift, provided good simulation of rock mass movement. But measurement technigues of mechanical and hydrological properties of narrow zone adjacent to the drift wall and understanding of relationship between mechanical property change and hydrological one and phenomenon of disturbed zone generation remained as future study subjects.

JAEA Reports

The International stripa project; Excutive summary of phase 2

*

PNC-TN7410 90-004, 41 Pages, 1989/12

PNC-TN7410-90-004.pdf:1.53MB

The Second Phase of the Stripa Project included the continued development of methods and techniques for repository site investigations. The crosshole investigations demonstrated that it is possible to characterize fractures in crystaline rock with a reliability and realism not obtained before. At the investigated site at Stripa, it was shown that groundwater flow is concentrated within a few major fractures that were identified by geophysical methods. The main features were considered to be broadly planar, containing patches of high and low hydraulic conductivity. Detailed investigations of the fracture hydrology at Stripa and of the migration of tracers in the groundwater, together with additional information of the groundwater composition, resulted in an improved knowledge of groundwater flow in fractured crystalline rock. The work at Stripa has shown that it is possible to collect and analyze data that enable one to determine the type of distribution its parameters for each of the essential geometrical and hydraulic properties of the fracture system, and hence compare one site with another as part of experience building in safety assessment studies. The migration experiment demonstrated that the groundwater flow could be very unevenly distributed in the rock. Together with the tritium measurements it also gave strong support to the notion that a non-negligible portion of the flow takes place in channels which have little contact with other main channels. A further research effort has to be devoted to development of appropriate numerical models for the description of flow in fractured crystalline rock. The hydrogeochemical investigations at Stripa also indicated that a new type of solute source must be considered - fluid inclusions in the host rock. The age of the solutes may be entirely different from the age of the groundwater. At Stripa, the age of the solutes is likely to be hundreds of millions of years older than the groundwaters. Furthermore, this ...

Oral presentation

Visualization technique with the energy-resolved neutron imaging system, RADEN

Kai, Tetsuya

no journal, , 

no abstracts in English

17 (Records 1-17 displayed on this page)
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