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Tanaka, Atsushi; Hase, Yoshihiro; Ono, Yutaka; Ishikawa, Hidetaka*; Koike, Aki*
JAEA-Review 2015-022, JAEA Takasaki Annual Report 2014, P. 96, 2016/02
no abstracts in English
Tanaka, Atsushi; Hase, Yoshihiro; Ono, Yutaka; Ishikawa, Hidetaka*; Koike, Aki*
JAEA-Review 2014-050, JAEA Takasaki Annual Report 2013, P. 107, 2015/03
no abstracts in English
Tanaka, Atsushi; Nozawa, Shigeki; Hase, Yoshihiro; Narumi, Issey*; Ishikawa, Hidetaka*; Koike, Aki*
JAEA-Review 2013-059, JAEA Takasaki Annual Report 2012, P. 103, 2014/03
Azad, M. A. K.*; Mazumdar, M. N. N.*; Chaki, A. K.*; Ali, M.*; Hakim, M. L.*; Mamun, A. N. K.*; Hase, Yoshihiro; Nozawa, Shigeki; Tanaka, Atsushi; Koike, Aki*; et al.
SABRAO Journal of Breeding and Genetics, 45(2), p.179 - 186, 2013/06
no abstracts in English
Tanaka, Atsushi; Nozawa, Shigeki; Hase, Yoshihiro; Narumi, Issei; Ishikawa, Hidetaka*; Koike, Aki*
JAEA-Review 2012-046, JAEA Takasaki Annual Report 2011, P. 96, 2013/01
Tsusaka, Kimikazu; Tokiwa, Tetsuya; Inagaki, Daisuke; Hatsuyama, Yoshihiro*; Koike, Masashi*; Ijiri, Yuji*
Doboku Gakkai Rombunshu, F1 (Tonneru Kogaku) (Internet), 68(2), p.40 - 54, 2012/09
Japan Atomic Energy Agency has excavating three deep shafts through soft sedimentary rock at Horonobe Underground Research Laboratory. In this paper, the author discussed rock mass behaviour induced by the 6.5 m diameter shaft sinking. They conducted geological mapping in an excavation face and boreholes digged around the shaft wall, field measurements such as convergence measurements and monitoring of rock displacements using multi-interval borehole extensometers around a shaft at around 160 m and 220 m in depths, and three-dimensional numerical analysis which models the shaft excavation procedure such as timing of installation of support elements and setting and removal of a concrete form. As a result, it was clarified that remarkablely large compressive strains occurred within about 1 m into the shaft wall since the rock mass behaviour was controlled by the concrete lining and that the behaviour would predominantly be induced by the fractures closing which opened significantly and propagated during excavation steps before the installation of a concrete lining and the directions where the strains occurred heavily depended on the fracture orientation around the shaft.
Tsusaka, Kimikazu; Inagaki, Daisuke; Hatsuyama, Yoshihiro*; Koike, Masashi*; Shimada, Tomohiro*; Ijiri, Yuji*
Doboku Gakkai Rombunshu, F1 (Tonneru Kogaku) (Internet), 68(1), p.7 - 20, 2012/05
Japan Atomic Energy Agency has excavating three deep shafts through soft sedimentary rock at Horonobe Underground Research Laboratory. In this paper, the author discussed change in stress and the stress distribution in a concrete lining and steel arch sets induced by the 6.5 m diameter shaft sinking. They conducted not only field measurements of stress in support elements at around 220 m in depth but also three-dimensional numerical analysis which models the shaft excavation procedure such as timing of installation of support elements and setting and removal of a concrete form. As a result, it was clarified that more than 10 MPa difference in circumferential stress occurred in a 2 m high and 400 mm thick concrete lining due to anisotropy of initial stress and three-dimensional effect of an excavation face. It was also found that a concrete lining gradually deformed from an original cylindrical form to an "oval salad bowl" form with the long axis pallarel to the direction of the minimum horizontal principal stress after a concrete form was removed.
Tanaka, Atsushi; Nozawa, Shigeki; Hase, Yoshihiro; Narumi, Issei; Ishikawa, Hidetaka*; Koike, Aki*
JAEA-Review 2011-043, JAEA Takasaki Annual Report 2010, P. 101, 2012/01
Kawachi, Tetsuya; Hasegawa, Noboru; Nishikino, Masaharu; Ishino, Masahiko; Imazono, Takashi; Oba, Toshiyuki; Kaihori, Takeshi; Kishimoto, Maki; Ochi, Yoshihiro; Tanaka, Momoko; et al.
X-Ray Lasers 2010; Springer Proceedings in Physics, Vol.136, p.15 - 24, 2011/12
This paper reviews recent improvement in the source development of laser-driven X-ray lasers and the applications in the research fields of material science, laser processing, X-ray imaging, and radiation damage in biological cells. In the application for material science, we have firstly observed temporal correlation between the domain structures of ferro-electric substance under the Curie temperature. In the laser processing, new X-ray laser interferometer reveals us the nano-scale surface distortion of substance pumped by a femto-second optical pulse. In the X-ray diffraction image, we have taken several static images of micro-structure of samples: now we are trying to extend the objective to nano-scale dynamics using pump and probe method. In the radiation damage of biological cells, we observed double strand break in DNA using X-ray laser exposure; this results are compared with the case using incoherent several KeV X-ray exposure.
Tsusaka, Kimikazu; Inagaki, Daisuke; Koike, Masashi*; Ijiri, Yuji*; Hatsuyama, Yoshihiro*
Harmonising Rock Engineering and the Environment, p.305 - 308, 2011/10
In this paper, the authors discussed circumferential stress distribution in a concrete lining and displacement of rock around shaft wall induced by shaft excavation at Horonobe Underground Research Laboratory. Field measurements of the lining stress and rock displacement were conducted between 218 m and 220 m in depths during excavation of a 6.5 m diameter access shaft and the results were analyzed using a three-dimensional numerical model. As a result, it was found that the maximum and minimum stresses occurred in the direction of horizontal minimum and maximum initial stresses, respectively. It was also clarified that difference in the stress between the maximum and minimum values was beyond 10 MPa. In addition, it was found that compressive axial strain occurred around a shaft wall after casting concrete lining since rock behavior in the vicinity of shaft wall was controlled by a concrete lining.
Inagaki, Daisuke; Tsusaka, Kimikazu; Ijiri, Yuji*; Koike, Masashi*; Hatsuyama, Yoshihiro*
Dai-40-Kai Gamban Rikigaku Ni Kansuru Shimpojiumu Koen Rombunshu (CD-ROM), 6 Pages, 2011/01
no abstracts in English
Tsusaka, Kimikazu; Inagaki, Daisuke; Koike, Masashi*; Ijiri, Yuji*; Hatsuyama, Yoshihiro*
Dai-40-Kai Gamban Rikigaku Ni Kansuru Shimpojiumu Koen Rombunshu (CD-ROM), p.7 - 12, 2011/01
no abstracts in English
Tanaka, Atsushi; Nozawa, Shigeki; Hase, Yoshihiro; Narumi, Issei; Ishikawa, Hidetaka*; Koike, Aki*
JAEA-Review 2010-065, JAEA Takasaki Annual Report 2009, P. 61, 2011/01
Kiriyama, Hiromitsu; Mori, Michiaki; Nakai, Yoshiki; Shimomura, Takuya*; Tanoue, Manabu*; Okada, Hajime; Sasao, Hajime; Wakai, Daisuke*; Kondo, Shuji; Kanazawa, Shuhei; et al.
JAEA-Conf 2009-007, p.97 - 100, 2010/03
no abstracts in English
temporal contrast, above 10
W/cm
peak intensity pulses at a 10 Hz repetition rate using an OPCPA preamplifier in a double CPA, Ti:sapphire laser systemKiriyama, Hiromitsu; Mori, Michiaki; Nakai, Yoshiki; Shimomura, Takuya; Tanoue, Manabu*; Okada, Hajime; Kondo, Shuji; Kanazawa, Shuhei; Sagisaka, Akito; Daito, Izuru; et al.
AIP Conference Proceedings 1153, p.3 - 6, 2009/07
We demonstrate a high-contrast, high-intensity double chirped-pulse amplification (CPA) Ti:sapphire laser system using an optical parametric chirped-pulse amplifier (OPCPA) as a preamplifier. By injecting cleaned microjoule seed pulses into the OPCPA, a temporal contrast greater than 10 within picosecond times before the main femtosecond pulse is demonstrated with the output pulse energy of 1.7 J and pulse duration of 30 fs, corresponding to a peak power of 60 TW at a 10 Hz repetition rate. This system uses a cryogenically-cooled Ti:sapphire final amplifier and generates focused peak intensities in excess of 10 W/cm.
hort (cv. White Aga)Kondo, Masayoshi*; Koike, Yosuke*; Okuhara, Hiroyuki*; Oda, Masayuki*; Hase, Yoshihiro; Yoshihara, Ryohei; Kobayashi, Hitoshi*
JAEA-Review 2008-055, JAEA Takasaki Annual Report 2007, P. 67, 2008/11
no abstracts in English
cv. Acapulco.Kondo, Masayoshi*; Koike, Yosuke*; Hase, Yoshihiro; Yokota, Yuichiro; Kobayashi, Hitoshi*
JAEA-Review 2007-060, JAEA Takasaki Annual Report 2006, P. 75, 2008/03
no abstracts in English
Al
, 1; Surveys in reciprocal space using neutron inelastic scatteringHiess, A.*; Bernhoeft, N.*; Metoki, Naoto; Lander, G.*; Roessli, B.*; Sato, Noriaki*; Aso, Naofumi*; Haga, Yoshinori; Koike, Yoshihiro*; Komatsubara, Takemi*; et al.
Journal of Physics; Condensed Matter, 18(27), p.R437 - R451, 2006/07
Times Cited Count：32 Percentile：33.53(Physics, Condensed Matter)This topical review presents results from neutron inelastic scattering experiments on single crystals of UPdAl. We present a detailed and complete characterization of the wave vector- and energy-dependent magnetization dynamics in UPdAl as measured by neutron inelastic scattering primarily in the form of extensive surveys in energy-momentum space under a wide range of experimental conditions, and put our observations in context with data that has been published previously by two independent groups. This study yields unique insight into the low-temperature ground state, which exhibits a microscopic coexistence of antiferromagnetism and superconductivity, makingUPdAl one of the most accessible heavy-fermion superconductors that can be fully characterized by neutron spectroscopy.
Si as studied by neutron scatteringSato, Masugu*; Koike, Yoshihiro*; Katano, Susumu; Metoki, Naoto; Kadowaki, Hiroaki*; Kawarazaki, Shuzo*
Journal of the Physical Society of Japan, 73(12), p.3418 - 3421, 2004/12
Times Cited Count：20 Percentile：68.56(Physics, Multidisciplinary)no abstracts in English
=1/2 two-dimensional frustrated antiferromagnet Cs
CuBr
Ono, Toshio*; Tanaka, Hidekazu*; Kolomiyets, O.*; Mitamura, Hiroyuki*; Goto, Tsuneaki*; Nakajima, Kenji; Osawa, Akira; Koike, Yoshihiro; Kakurai, Kazuhisa; Klenke, J.*; et al.
Journal of Physics; Condensed Matter, 16(11), p.S773 - S778, 2004/03
Times Cited Count：64 Percentile：89.38(Physics, Condensed Matter)no abstracts in English
