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Goto, Akira; Sasaki, Akimichi*; Komatsu, Tetsuya; Miwa, Atsushi*; Terusawa, Shuji*; Kagohara, Kyoko*; Shimada, Koji
JAEA-Research 2020-013, 88 Pages, 2020/11
JAEA-Research-2020-013.pdf:22.86MB
JAEA-Research-2020-013-appendix(CD-ROM).zip:0.18MB
Improvement of the investigation techniques to identify active faults is important for the implementation of geological disposal projects from the viewpoint of avoiding locations where permeability increases due to fault displacement. Generally, the existence of active faults is confirmed by aerial photography interpretation of fault displacement topography, which is a topographical trace of fault movement, and on-site geological surveys. However, the investigation method for cases where the topographical traces are unclear is not sufficiently developed. Therefore, to improve existing topographical methods, this study deciphered lineaments up to the rank of poorly defined features, which are almost neglected in general active fault research. The investigation area is one of the geodetic strain concentration zone, called the southern Kyushu shear zone, where the seismogenic faults of the 1997 Kagoshima northwest earthquakes are concealed. We conducted aerial photography interpretation of 62 sheets of 1/25,000 topographic maps, and obtained 1,327 lineaments. Distribution density, direction and length of lineaments were also investigated with topographic and geologic information. As a result, it was clarified that the east-west lineaments in the south Kyushu shear zone predominate in the western part, and the lineaments are densely distributed in the aftershock distribution area of the Kagoshima northwest earthquake. Along with these results, we have compiled a catalog of typical 13 lineaments based on combinations of clarity, direction, length and geomorphic characters of lineaments.
Miwa, Kazuji; Terasaka, Yuta; Ochi, Kotaro; Futemma, Akira; Sasaki, Miyuki; Hirouchi, Jun
Nihon Genshiryoku Gakkai-Shi ATOMO
, 61(9), p.687 - 691, 2019/09
This report summarizes the contents of the session of the Health Physics and Environment Science Division, which was held in Atomic Energy Society of Japan 2019 Spring Meeting. In this session, six students and young researchers who engaged in the field of nuclear energy and radiation gave a lecture about health physics and environmental science research through their expertise. After the all presentations end, we took discussion time about the issues and future development in this field with all attendees. In this report, we summarized each lecture outline and discussion contents.
Takahashi, Masamitsu; Kozu, Miwa*; Sasaki, Takuo
Japanese Journal of Applied Physics, 55(4S), p.04EJ04_1 - 04EJ04_4, 2016/04
Times Cited Count：5 Percentile：24.61(Physics, Applied)Takahashi, Masamitsu; Kozu, Miwa*; Sasaki, Takuo; Hu, W.*
Crystal Growth & Design, 15(10), p.4979 - 4985, 2015/10
Times Cited Count：14 Percentile：71.04(Chemistry, Multidisciplinary)Hu, W.; Suzuki, Hidetoshi*; Sasaki, Takuo*; Kozu, Miwa*; Takahashi, Masamitsu
Journal of Applied Crystallography, 45(5), p.1046 - 1053, 2012/10
Times Cited Count：12 Percentile：71.94(Chemistry, Multidisciplinary)Osaka, Masahiko; Donomae, Takako; Ichikawa, Shoichi; Sasaki, Shinji; Ishimi, Akihiro; Inoue, Toshihiko; Sekio, Yoshihiro; Miwa, Shuhei; Onishi, Takashi; Asaka, Takeo; et al.
Proceedings of 1st Asian Nuclear Fuel Conference (ANFC), 2 Pages, 2012/03
Support system for training and education of future expert in hot laboratories of Oarai-JAEA, named FEETS, is presented. The system has been established based on research results on both characterization of Oarai hot laboratory and user-needs. Various programs under FEETS are also introduced.
Sasaki, Takuo*; Suzuki, Hidetoshi*; Inagaki, Makoto*; Ikeda, Kazuma*; Shimomura, Kenichi*; Takahashi, Masamitsu; Kozu, Miwa*; Hu, W.; Kamiya, Itaru*; Oshita, Yoshio*; et al.
IEEE Journal of Photovoltaics, 2(1), p.35 - 40, 2012/01
Times Cited Count：5 Percentile：22.47(Energy & Fuels)Fukushi, Keisuke*; Sasaki, Miwa*; Sato, Tsutomu*; Yanase, Nobuyuki; Amano, Hikaru; Ikeda, Hodaka*
Applied Geochemistry, 18(8), p.1267 - 1278, 2003/08
Times Cited Count：220 Percentile：95.91(Geochemistry & Geophysics)At Nishinomaki abandoned mine district, the water is acidic and contains much amounts of arsenic. However, arsenic concentration decreases downward without any artificial treatment. To understand the mechanism of the natural attenuation, the acid mine drainage and the ochreous precipitates were collected. The samples were analyzed by XRD, IR, ICP-MS and ion-chromatograph. The precipitates were investigated by selective extraction procedure. These results were interpreted with those calculated by the geochemical code. The contamination of water has been result from oxidation of pyrite and realgar and subsequent release of iron. The released ferrous iron transforms to ferric form by bacterial oxidation and then schwertmannite forms immediately. While the arsenic concentrations in the stream are lowered to background level at downstream, these in the ochreous precipitates are up to 60 mg/g. The iron hydroxide has been known to exhibit the high sorption affinity to arsenate. Hence, arsenic is effectively removed by the schwertmannite from the contaminated water and attenuated naturally.
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=1.5-2.4 GeVZegers, R. G. T.*; Sumihama, Mizuki*; Ahn, D. S.*; Ahn, J. K.*; Akimune, Hidetoshi*; Asano, Yoshihiro; Chang, W. C.*; Dat
, S.*; Ejiri, Hiroyasu*; Fujimura, Hisako*; et al.
Physical Review Letters, 91(9), p.092001_1 - 092001_4, 2003/08
Times Cited Count：128 Percentile：94.88(Physics, Multidisciplinary)no abstracts in English
= +1 Baryon resonance in photoproduction from the neutronNakano, Takashi*; Ahn, D. S.*; Ahn, J. K.*; Akimune, Hidetoshi*; Asano, Yoshihiro; Chang, W. C.*; Date, S.*; Ejiri, Hiroyasu*; Fujimura, Hisako*; Fujiwara, Mamoru; et al.
Physical Review Letters, 91(1), p.012002_1 - 012002_4, 2003/07
Times Cited Count：1007 Percentile：99.86(Physics, Multidisciplinary)no abstracts in English
Miwa, Atsushi*; Sasaki, Tatsuya*; Hara, Hiroshi*
JNC TJ7420 2005-030, 131 Pages, 2003/03
The purpose of this study is conducted for the purpose of considering as the basic data for evaluating the influence range by dislocation movement. The contents of studies are consideration by the investigation technique of collection arrangement of drilling data, collection arrangement of active fault underground structure, informational GIS-izing, creation of a 3-dimensional geological structure model, and the influence range of an active fault belt. Informational collection carried out for the national active fault in Japan, and the dislocation which refers to the result and is set as the object of informational GIS-izing and a 3-dimensional geological structure model was made into Senya active fault dislocations in the rim of the east of the Yokote basin faults in northeast Japan.In the 3-dimensional geological structure model, the data of the interpretation of sectional view of the seismic reflecting method, a geologic map, active fault information, and the inversion tectonics of northeast Japan were made reference, and it created on the scale of 1/50,000. As a result of verifying the accuracy of the model as compared with a gravity inquiry result, the error of base rock form is less than 1km. However, base rock form is the accuracy of the synthetic model after the back-arc basin formative period after 15Ma In order for the influence range of an active fault belt to verify from now on, data, such as airborne geophysics and gravity of the accuracy which the modification after the east-and-west strong compression term (2.4Ma or subsequent ones) after inversion tectonics.
Miwa, Atsushi*; Sasaki, Tatsuya*; Shimoyama, Masahiro*; Takahashi, Nao*
JNC TJ7420 2005-029, 110 Pages, 2000/03
It is important study that to presume probability of changing fault activity in the future. At first, we need to investigate the fault activity in the past time in order to presume when the active faults will move. We investigate the fault activity in the past time. And we try to distribute Japanese Islands into the fault tectonics regions. We collect the reports, arrange these and analyze these in order to understand the distinctions of fault tectonics. We notice the reports of fourteen-point, namely. (1) stress distribution, (2) faults distribution of time and space, (3) active fault distribution, (4) active structures, (5) geological structure, (6) earthquake distribution, (7) strain distribution, (8) GPS (Global Positioning System)-crustal movement, (9) sedimentary basin distribution, (10) gravity anomaly, (11) terrace surface distribution, (12) volcanic distribution, (13) resistivity distribution and (14) seismic tomography. We change these collected reports into GIS (Geographic Information System). And we investigate into the fault tectonics regions with GIS. We distribute Japanese Islands into 13 large regions about the fault tectonics regions, and into 44 small regions about the fault tectonics regions.
Miwa, Atsushi*; Sasaki, Tatsuya*; Takahashi, Nao*
JNC TJ7420 2005-027, 334 Pages, 2000/03
JNC-TJ7420-2005-027.pdf:53.45MB
It is important study to seize fault activity in order to clarify how effects the active faults influence geo-environment. In this paper, we investigated the distributive character and the activity of active faults with precise aerial photograph interpretation of tectonic landforms. And we prepared fault parameters for this new data by compiling previous results. A number of active faults exist particularly in central Japan. There is a marked regularity in the fault systems between the trend of faults and the sense of the displacement: the reverse fault system distributes in the Northeast Japan with NS-trending, the lateral faults distribute in the Southwest Japan. In particular, NW-trending faults are left-lateral, whereas NE-trending faults are right-lateral. Normal faults are in the central Kyusyu. This implies that the earth's crust of the region is under the same stress system having the maximum principal axis of approximate east-west. Activity of most of the active faults in Japan is class B(10-4 meters per one year). It is limited the distribution of active faults of class A. We presumed when active faults started to move from fault parameters. Active faults in Japan have started at least through a few hundreds thousand years ago.
Asaka, Takeo; Osaka, Masahiko; Donomae, Takako; Ichikawa, Shoichi; Sasaki, Shinji; Ishimi, Akihiro; Inoue, Toshihiko; Sekio, Yoshihiro; Miwa, Shuhei; Onishi, Takashi; et al.
no journal, ,
Activities on a system development for education and training of future experts in the nuclear field thorough experiments at PIE facilities are given. Basic concept of the system and acceptance-support apparatus are introduced.
Hu, W.; Takahashi, Masamitsu; Kozu, Miwa*; Suzuki, Hidetoshi*; Sasaki, Takuo*
no journal, ,
Takahashi, Masamitsu; Hu, W.; Kozu, Miwa*; Sasaki, Takuo*; Oshita, Yoshio*; Suzuki, Hidetoshi*
no journal, ,
Growth dynamics of semiconductor nanostructures ranging from quantum wells to quantum dots will be discussed on the basis of in situ X-ray diffraction. Experiments were performed using a molecular-beam epitaxy (MBE) chamber integrated with an X-ray difftactometer at 11XU of SPring-8. First, of all the nanostructures, quantum wells are playing the most important roles in technological applications today. For in situ study of growth of quantum wells, we have developed a real time X-ray technique enabling three-dimensional reciprocal space mapping during growth and applied it for the investigation of InGaAs growth on GaAs(001). Second, quantum wires are recently attracting much interest because of their extremely anisotropic one-dimensional shape. In this paper, we will present in situ X-ray diffraction data during the As-assisted vapor-liquid-solid growth of GaAs nanowires. Finally, the growth of quantum dots, which are the ultimate quantum structure, will be discussed as well.
Hu, W.; Suzuki, Hidetoshi*; Sasaki, Takuo*; Kozu, Miwa*; Takahashi, Masamitsu
no journal, ,
Takahashi, Masamitsu; Kozu, Miwa*; Sasaki, Takuo
no journal, ,
Sasaki, Akimichi*; Komatsu, Tetsuya; Miwa, Atsushi*; Terusawa, Shuji*; Kagohara, Kyoko*; Higa, Saki*
no journal, ,
no abstracts in English
Shimada, Taro; Miwa, Kazuji; Sasaki, Toshihisa*; Takeda, Seiji
no journal, ,
The authors are developing a methodology for confirming that public dose using the site after site release will be in compliance with the dose criteria based on the radioactivity distribution at the termination of the decommissioning of nuclear facilities. In a previous study, it was confirmed that kriging with external drift combined with scoping survey and representative measurement could evaluate the radioactivity distribution. However, the issue that evaluated distribution should be validated from the viewpoint of sufficiency on points of representative measurement remained. Therefore, we developed the method for the validation, that mean absolute error (MAE) between each measured value and evaluated value is less than a reference value of MAE between an average of measured values and each measured value. The method was applied to supposed distributions and it was confirmed that some of the evaluated distributions were validated.
