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Nakajima, Toru; Kawakami, Tetsuo*; Iwano, Hideki*; Danhara, Toru*; Sakai, Harutaka*
Journal of Geophysical Research; Solid Earth, 127(5), p.e2021JB023630_1 - e2021JB023630_33, 2022/05
Times Cited Count：1 Percentile：22.72(Geochemistry & Geophysics)The thermochronological methods were applied to the Higher Himalayan Crystalline (HHC) nappe and the underlying Lesser Himalayan sediments (LHS) to elucidate the denudation process of the middle- and upper-crust of eastern Nepal over the geological time scale. The thermochronological inverse analysis was undertaken for new results of fission-track (FT) age and FT length data of zircon and apatite in order to reconstruct the time-temperature (
) paths in the temperature range of 60-350 degree. Eight paths obtained along the across-strike section showed that the cooling process of the HHC nappe was characterized by following three aspects: (1) gradual cooling followed by rapid cooling and subsequent gradual cooling, (2) northward-younging of the timing of the rapid cooling, (3) gradual cooling followed by ca. 2 Myr rapid cooling in the frontmost part of the HHC nappe. The observed FT ages and paths were then compared with those predicted by forward thermokinematic modeling. The results of the thermokinematic modeling for the Flat-Ramp-Flat MHT model, in which the HHC and the underlying LHS are denudated accompanied with the movement of the Main Himalayan Thrust (MHT), well reproduced the observed paths and FT ages in eastern Nepal. This suggests that the observed FT ages and paths reflect a denudation process driven by the movement of the MHT showing the flat-ramp-flat geometry, and that the denudation rate and its spatial distribution have roughly been constant in eastern Nepal since ca. 9 Ma.
F from 
O
?Tang, T. L.*; Uesaka, Tomohiro*; Kawase, Shoichiro; Beaumel, D.*; Dozono, Masanori*; Fujii, Toshihiko*; Fukuda, Naoki*; Fukunaga, Taku*; Galindo-Uribarri, A.*; Hwang, S. H.*; et al.
Physical Review Letters, 124(21), p.212502_1 - 212502_6, 2020/05
Times Cited Count：14 Percentile：74.18(Physics, Multidisciplinary)The structure of a neutron-rich F nucleus is investigated by a quasifree (
) knockout reaction. The sum of spectroscopic factors of 
orbital is found to be 1.0 
0.3. The result shows that the O core of F nucleus significantly differs from a free O nucleus, and the core consists of 
35% O
, and 65% excited O. The result shows that the O core of F nucleus significantly differs from a free O nucleus. The result may infer that the addition of the 
proton considerably changes the neutron structure in F from that in O, which could be a possible mechanism responsible for the oxygen dripline anomaly.
Abe, Hironobu; Hatakeyama, Nobuya; Yamazaki, Masanao; Okuzono, Akihiko*; Sakai, Tetsuo*; Inoue, Masahiro*
JAEA-Research 2009-019, 192 Pages, 2020/02
JAEA-Research-2009-019.pdf:8.07MB
Construction of the underground facility is on going at the Horonobe Underground Research Center, a division of the Japan Atomic Energy Agency. The facility is consisted of three shafts and horizontal drifts at the completion of construction and it is excavated in geological environment with methane gas, so it is important to secure the workers and visitors security in case of fire in the underground. However, it is known that the fire gas such as methane shows a complicated behavior by drift effect and so on and very difficult to predict its behavior, even if under enforced ventilation. In order to construct new prediction method of the fire gas behavior, the model scaled experiments were conducted by using the basic model which consists of shafts and drifts. As a results, fundamental data of the fire gas behavior was grasped and complicated behavior of the fire gas such as three-dimensional backflow and main flow inversion phenomena at the underground structure were ascertained. A new fire gas behavior analysis system has been designed and a prototype system has been programmed which is able to simulate the phenomena noted above. Coupling analysis method is adapted to the system, which consists of mainly one-dimensional ventilation network analysis and simplified computational fluid dynamics program named M-CFD. To minimize calculation time, M-CFD was designed as two-dimensional calculation with simulators multi area analysis system. Using the prototype system, several experimented models representing typical behavior of fire gas have been simulated for model scaled experiments. The system qualitatively reappeared the phenomena such as back flow or main flow inversion, and most of calculations completed in expected time. This indicates appropriateness of the prototype system, but some upgrade such as heat conductivity analysis in the wall rock mass transfer calculation, user friendly interface system and others will be required.
Maeda, Koji; Sasaki, Shinji; Kumai, Misaki; Sato, Isamu; Suto, Mitsuo; Osaka, Masahiko; Goto, Tetsuo*; Sakai, Hitoshi*; Chigira, Takayuki*; Murata, Hirotoshi*
Journal of Nuclear Science and Technology, 51(7-8), p.1006 - 1023, 2014/07
Times Cited Count：14 Percentile：72.55(Nuclear Science & Technology)Since the start of the severe accident at the Fukushima Daiichi Nuclear Power Plant in March 2011, concrete surfaces within the reactor buildings have been exposed to radioactive contaminants. Released radiation sources still remain too high to permit entry into some areas of the RBs to allow the damage to be assessed and to allow carrying out the restoration of lost safety functions, decommissioning activities, etc. In order to clarify the situation of this contamination in the RBs, 18 samples were subjected to analyses to determine the surface radionuclide concentrations and to characterize the radionuclide distributions in the samples. Decontamination tests on the sample of Unit 2 were conducted to reduce the levels of radioactivity present near the sample surface. As a result of the tests, the level of radioactivity of the sample was reduced with the removal of 97% of the contamination present near the sample surface.
Sr
MnO
thin films studied by X-ray magnetic circular dichroismShibata, Goro*; Yoshimatsu, Kohei*; Sakai, Enju*; Singh, V. R.*; Verma, V.*; Ishigami, Keisuke*; Harano, Takayuki*; Kadono, Toshiharu*; Takeda, Yukiharu; Okane, Tetsuo; et al.
Physical Review B, 89(23), p.235123_1 - 235123_5, 2014/06
Times Cited Count：23 Percentile：66.6(Materials Science, Multidisciplinary)Maeda, Koji; Sasaki, Shinji; Kumai, Misaki; Sato, Isamu; Osaka, Masahiko; Fukushima, Mineo; Kawatsuma, Shinji; Goto, Tetsuo*; Sakai, Hitoshi*; Chigira, Takayuki*; et al.
Proceedings of International Nuclear Fuel Cycle Conference; Nuclear Energy at a Crossroads (GLOBAL 2013) (CD-ROM), p.272 - 277, 2013/09
Kimura, Hideo; Aoyagi, Tetsuo; Sato, Taiichi; Sakai, Manabu; Hikasa, Naoki*; Suzuki, Hitoshi; Tsuji, Minoru
JAEA-Technology 2011-027, 31 Pages, 2011/09
JAEA-Technology-2011-027.pdf:2.16MB
The financial accounting and contract management system of JAEA, built on a commercial ERP package, had suffered from serious problems of high lifecycle cost, poor response, and lack of extensibility, due to the too much customization to the ERP package, and disorganized software structure. To solve those problems, three approaches were applied; (1) conducting thorough analysis of business flow and fit/gap, which enabled removing all customization brought to the ERP package; (2) dividing the system into subsystems, and clearly defining interfaces between the subsystems, which increases the transparency, extensibility and performance of the system; (3) outsourcing the development of the subsystems to multiple venders to reduce the development cost. Those approaches can be useful for developing business information systems using commercial software to save time and cost, while meeting the unique requirements of an organization.
Sakanaka, Shogo*; Akemoto, Mitsuo*; Aoto, Tomohiro*; Arakawa, Dai*; Asaoka, Seiji*; Enomoto, Atsushi*; Fukuda, Shigeki*; Furukawa, Kazuro*; Furuya, Takaaki*; Haga, Kaiichi*; et al.
Proceedings of 1st International Particle Accelerator Conference (IPAC '10) (Internet), p.2338 - 2340, 2010/05
Future synchrotron light source using a 5-GeV energy recovery linac (ERL) is under proposal by our Japanese collaboration team, and we are conducting R&D efforts for that. We are developing high-brightness DC photocathode guns, two types of cryomodules for both injector and main superconducting (SC) linacs, and 1.3 GHz high CW-power RF sources. We are also constructing the Compact ERL (cERL) for demonstrating the recirculation of low-emittance, high-current beams using above-mentioned critical technologies.
Kimura, Hideo; Aoyagi, Tetsuo; Sakai, Manabu; Sato, Taiichi; Tsuji, Minoru
JAEA-Technology 2008-075, 32 Pages, 2008/11
JAEA-Technology-2008-075.pdf:8.29MB
JAEA developed the ERP (Enterprise Resource Planning) system at the establishment in 2005, aiming to support and enhance its business-critical task such as financial accounting and contract management. We considered the conceptual design of the next ERP system, and we implemented the prototype system to validate its effectiveness. Moreover, we implemented the simple add-on tool for rapid and easy development. At the result, we gauged the future prospects that the XML-centric system which we designed will offer high modularity, flexibility, connectivity between other systems, independence among subsystems. The simple add-on tool also demonstrated its effectiveness.
Yamasaki, Chisato*; Murakami, Katsuhiko*; Fujii, Yasuyuki*; Sato, Yoshiharu*; Harada, Erimi*; Takeda, Junichi*; Taniya, Takayuki*; Sakate, Ryuichi*; Kikugawa, Shingo*; Shimada, Makoto*; et al.
Nucleic Acids Research, 36(Database), p.D793 - D799, 2008/01
Times Cited Count：51 Percentile：71.25(Biochemistry & Molecular Biology)Here we report the new features and improvements in our latest release of the H-Invitational Database, a comprehensive annotation resource for human genes and transcripts. H-InvDB, originally developed as an integrated database of the human transcriptome based on extensive annotation of large sets of fulllength cDNA (FLcDNA) clones, now provides annotation for 120 558 human mRNAs extracted from the International Nucleotide Sequence Databases (INSD), in addition to 54 978 human FLcDNAs, in the latest release H-InvDB. We mapped those human transcripts onto the human genome sequences (NCBI build 36.1) and determined 34 699 human gene clusters, which could define 34 057 protein-coding and 642 non-protein-coding loci; 858 transcribed loci overlapped with predicted pseudogenes.
Sakai, Tetsuo*; Kashiwase, Yoichi*; Mikake, Shinichiro; Sato, Toshinori
Chika Kukan Shimpojiumu, Rombunshu, 12, p.161 - 168, 2007/01
no abstracts in English
Sakai, Tetsuo*; Okuzono, Akihiko*; Kashiwase, Yoichi*
JNC TJ7410 2004-001, 53 Pages, 2004/03
JNC-TJ7410-2004-001.pdf:3.12MB
At the Tono mine, which belongs to Japan Nuclear Cycle Development Institute (herein after JNC), five thermistor anemometers have been installed separately at the main airway and air velocity is being monitored at the surface continuously to check the underground condition. However, since each thermistor anemometer can measure a point velocity in the cross section, so it is difficult to grasp the correct average air velocity. Therefore, based on the measurement result of the air velocity at the 38 points arranged on the same section at Hon-Nobe Kodo, 160m from the pit bottom, those data were analyzed by statistics processing method and a positional coefficient of proofreading was calculated in order to find out average air velocity by the measured velocity of the installed anemometer. Semicylindrical shape sectional view of the air velocity with considerable velocity even near the wall was obtained by the statistics processing method. According to the analysis result, 1.03m/sec average air velocity was obtained compared to 1.20m/sec measured value and also 0.86 was calculated as a possitional coefficient of proofreading. By the result, it makes possible to find out average air velocity by the menitored value in the cross section of the airway. As a future subject, grasping correct ventilation balance of the whole mine and total evaluation of the ventilation will be required by perfoming air velocity measurement and calculate the positional coefficient of proofreading using same methodology at other anemometer installed position.
Sakai, Tetsuo*
JNC TJ7410 2005-009, 100 Pages, 2003/03
JNC-TJ7410-2005-009.PDF:3.77MB
no abstracts in English
Sakai, Tetsuo*
JNC TJ7410 2005-007, 476 Pages, 2002/03
JNC-TJ7410-2005-007.PDF:30.49MB
no abstracts in English
Co
X
(X=Ga, Al); Variation of the electronic structure from a mixed-valent to Kondo-lattice systemsOkane, Tetsuo; Fujimori, Shinichi; Ino, Akihiro; Fujimori, Atsushi; Dhar, S. K.*; Mitra, C.*; Manfrinetti, P.*; Palenzona, A.*; Sakai, O.*
Physical Review B, 65(12), p.125102_1 - 125102_7, 2002/03
Times Cited Count：13 Percentile：55.62(Materials Science, Multidisciplinary)no abstracts in English
Sakai, Tetsuo*
JNC TJ7410 2005-006, 419 Pages, 2001/03
JNC-TJ7410-2005-006.PDF:18.31MB
no abstracts in English
Tamaoki, Tetsuo*; Sakai, Takuhiko*; Endo, Hiroshi*; Haga, Kazuo; Takahashi, Ryoichi*
Nuclear Technology, 99(1), p.58 - 69, 1992/07
Times Cited Count：0 Percentile：0.01(Nuclear Science & Technology)None
Sakai, Tetsuo*; Hatakeyama, Nobuya; Fuse, Masato*; Narita, Minoru*
no journal, ,
no abstracts in English
Inoue, Masahiro*; Hidaka, Yuki*; Yamakami, Mitsunori; Hatakeyama, Nobuya; Okuzono, Akihiko*; Sakai, Tetsuo*
no journal, ,
A series of experimental study using a scaled model concerning the behavior of ventilation air during a mine fire was carried out. The model consists of two vertical shafts, three horizontal ducts and a exhaust fan. The cross section of the shaft and duct is 0.2m square. The height of the shafts is 3.4m. The length of the ducts is 1.5m. The airflow rate can be adjusted by regulators installed in each duct. The behavior of the fire gas was measured by anemometer, thermometer, and visualized image using laser light. Some amount of fire gas of high temperature rose upward gradually along the shaft wall regardless of the downward ventilation. Then the direction of main ventilation air suddenly reversed upward in the shaft. The direction of ventilation reversed in many places in the model and the fire gas reached even the part not anticipated. It was also found that the direction of ventilation in the shaft reversed upward entirely when the initial velocity of the airflow was small.
