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Oda, Chie; Kawama, Daisuke*; Shimizu, Hiroyuki*; Benbow, S. J.*; Hirano, Fumio; Takayama, Yusuke; Takase, Hiroyasu*; Mihara, Morihiro; Honda, Akira
Journal of Advanced Concrete Technology, 19(10), p.1075 - 1087, 2021/10
Times Cited Count：0 Percentile：0(Construction & Building Technology)Concrete in a transuranic (TRU) waste repository is considered a suitable material to ensure safety, provide structural integrity and retard radionuclide migration after the waste containers fail. In the current study, coupling between chemical, mass-transport and mechanical, so-called non-linear processes that control concrete degradation and crack development were investigated by coupled numerical models. Application of such coupled numerical models allows identification of the dominant non-linear processes that will control long-term concrete degradation and crack development in a TRU waste repository.
Ido, Takeshi*; Miura, Yukitoshi; Hoshino, Katsumichi; Kamiya, Kensaku; Hamada, Yasuji*; Nishizawa, Akimitsu*; Kawasumi, Yoshiaki*; Ogawa, Hiroaki; Nagashima, Yoshihiko*; Shinohara, Koji; et al.
Nuclear Fusion, 46(5), p.512 - 520, 2006/05
Times Cited Count：85 Percentile：92.79(Physics, Fluids & Plasmas)The electrostatic fluctuation spectrum and the fluctuation-induced particle flux of the JFT-2M tokamak were estimated using the hevy ion beam probe (HIBP) measurement. A geodesic acoustic mode (GAM) of the frequency about15kHz was identified in the L-mode. The GAM has its peak at about 3cm inside of the separatrix with the electric field of about 1.4kV/m. The estimated turbulent particle flux is found to be intermittent. It is found that the density fluctuation is modulated by the GAM in the wide frequency range and the coherence analysis shows that the flucruation-induced particle flux is partially contributed by the GAM. In the H-mode the GAM disappears and the fluctuation and the flux is much decreased.The mechanism of the large burst-like flux in the L-mode is not understood yet and left as the future problem.
estimatorSuzuki, Katsuo; Suzudo, Tomoaki; Nabeshima, Kunihiko
Nihon Genshiryoku Gakkai Wabun Rombunshi, 3(1), p.24 - 33, 2004/03
This paper concerns an application of digital optimal H estimator to the detection of faulty reactivity in real-time. The detection system, fundamentally based on the reactivity balance method, is composed of three modules, i.e. the net reactivity estimator, the feedback reactivity estimator and the reactivity balance circuit. H optimal filters are used for these two reactivity estimators, and the nonlinear neutronics are taken into consideration especially for the design of the net reactivity estimator. A series of performance tests of the detection system are conducted by using numerical simulations of reactor dynamics with the insertion of a faulty reactivity for an experimental fast breeder reactor JOYO. The system detects the typical artificial reactivity insertions of 1￠ within a few seconds with the accuracy of 0.1￠, and is satisfactory for its practical use.
-chain compound [Ni(chxn)
Br]Br; Spin-charge separation in hybridized 
-
chainsFujimori, Shinichi; Ino, Akihiro; Okane, Tetsuo; Fujimori, Atsushi; Okada, Kozo*; Manabe, Toshio*; Yamashita, Masahiro*; Kishida, Hideo*; Okamoto, Hiroshi*
Physical Review Letters, 88(24), p.247601_1 - 247601_4, 2002/06
Times Cited Count：13 Percentile：60.62(Physics, Multidisciplinary)We report on the results of angle-resolved photoemission experiments on a quasi-one-dimensional -chain compound [Ni(chxn)Br]Br (chxn = 1
,2-cyclohexanediamine), a one-dimensional Heisenberg system with 
and 
K, which shows a gigantic non-linear optical effect. A "band" having about 500meV energy dispersion is found in the first half of the Brillouin zone 
, but disappears at 
. Two dispersive features, expected from the spin-charge separation, as have been observed in other quasi-one-dimensional systems like SrCuO
, are not detected. These characteristic features are well reproduced by the - chain model calculations with a small charge-transfer energy 
compared with that of one-dimensional Cu-O based compounds. We propose that this smaller is the origin of the absence of clear spin- and charge-seperation in the photoemission spectra and strong non-linear optical effect in [Ni(chxn)Br]Br.
A.Saltelli*; Homma, Toshimitsu; T.Andres*
PC 94: Proc. of 6th Joint EPS-APS Int. Conf. on Physics Computing, 0, p.511 - 514, 1994/00
no abstracts in English
Robotica, 12, p.309 - 322, 1994/00
Times Cited Count：2 Percentile：32.49(Robotics)no abstracts in English
Mech. Mach. Theory, 28(5), p.685 - 697, 1993/00
Times Cited Count：0 Percentile：0.02(Engineering, Mechanical)no abstracts in English
Robotica, 11, p.253 - 262, 1993/00
Times Cited Count：0 Percentile：0.3(Robotics)no abstracts in English
*; ; Takeda, Tatsuoki
JAERI-M 89-021, 16 Pages, 1989/03
no abstracts in English
; ; *; *; *
Nihon Genshiryoku Gakkai-Shi, 22(1), p.55 - 67, 1980/00
Times Cited Count：3 Percentile：41.98(Nuclear Science & Technology)no abstracts in English
; Takeda, Tatsuoki
Nuclear Fusion, 14(4), p.577 - 579, 1974/04
Times Cited Count：3no abstracts in English
Yokoyama, Keiichi; Kobayashi, Takanori*
no journal, ,
We report a consideration on the non-linear optical response of molecules rotationally excited by impulsive Raman scattering. An ensemble of molecules which are cascadedly excited and de-excited among the rotational levels by a several numbers of Raman transitions is not uniform in spatial coherence and depend on the number of transition the molecule undergoes. Therefore, there is a possibility to obtain signal waveforms which cannot be explained by the conventional analysis method which ignores the non-locality of the density operator. In this study, we adopted non-local density operator to calculate non-linear optical response in such case. As a result, we predicted that significant angular dependence of observed signal appear due to the spherical wave of input pump laser pulse. We qualitatively confirmed the analysis reproduce the observed waveform.
