Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Kawakami, Takuto*; Nagai, Yuki; Yoshizawa, Shunsuke*; Kim, H.*; Hasegawa, Yukio*; Nakayama, Tomonobu*; Uchihashi, Takashi*; Hu, X.*
Journal of Physics; Conference Series, 568(2), p.022022_1 - 022022_5, 2014/12
Times Cited Count：2 Percentile：67.24(Physics, Applied)no abstracts in English
)-In using a scanning tunneling microscopeYoshizawa, Shunsuke*; Kim, H.*; Kawakami, Takuto*; Nagai, Yuki; Nakayama, Tomonobu*; Hu, X.*; Hasegawa, Yukio*; Uchihashi, Takashi*
Physical Review Letters, 113(24), p.247004_1 - 247004_5, 2014/12
Times Cited Count：68 Percentile：91.98(Physics, Multidisciplinary)We have studied the superconducting Si(111)-(
)-In surface using a 
He-based low-temperature scanning tunneling microscope. Zero-bias conductance images taken over a large surface area reveal that vortices are trapped at atomic steps after magnetic fields are applied. The crossover behavior from Pearl to Josephson vortices is clearly identified from their elongated shapes along the steps and significant recovery of superconductivity within the cores. Our numerical calculations combined with experiments clarify that these characteristic features are determined by the relative strength of the interterrace Josephson coupling at the atomic step.
Miyaji, Noriko; Katsumura, Soichiro; Kawakami, Yukio
Kaku Busshitsu Kanri Gakkai (INMM) Nihon Shibu Dai-31-Kai Nenji Taikai Rombunshu (CD-ROM), 7 Pages, 2010/12
A large-scale hot cell laboratory named FMF is located by the experimental fast reactor Joyo in Oarai Research and Development Center (JNC-2 site), Japan Atomic Energy Agency (JAEA). FMF conducts post irradiation examinations (PIE) of irradiated fuels in Joyo such as assemblies and pins. To the JNC-2 site, in the Integrated Safeguards (IS) approach, which treats FMF and Joyo as one sector, was applied in December, 2010. For this, a new verification system for the material transfer between Joyo and FMF has been developed. The system includes the followings: (1) surveillance system remotely monitoring movements of a declared transport cask, (2) random verifications for the nuclear material contained in the cask by measuring the neutron dose rate. The implementation of the IS incorporating the developed verification system to the JNC-2 site would strengthen effectiveness and efficiency of safeguards.
Miyaji, Noriko; Kawakami, Yukio; Koizumi, Atsuhiro; Otsuji, Ayako*; Sasaki, Keiichi*
IAEA-CN-184/60 (Internet), 6 Pages, 2010/11
FMF at Oarai Research and Development Center (JNC-2 site) conducts post irradiation examinations (PIE) of fuel assemblies irradiated in Joyo. After the PIEs, the tested material is shipped back to a Joyo spent fuel pond. For the IAEA to apply the integrated safeguards approach (ISA) to the FMF, a new verification system on material transfer between Joyo and the FMF has been established. Gross defect verification of the nuclear material contained in the cask is performed at the time of short notice random interim inspections (RIIs) by measuring the surface neutron dose rate of the cask, filled with water to reduce radiation. As the result of performing a series of preliminary tests, this system could be used for the verification purpose under the ISA. It is clear that application of the system under the ISA provides the transparency of the material shipping and receiving process would be improved.
Kawakami, Yukio
Saikuru Kiko Giho, (25), 0 Pages, 2004/00
Focusing on the cover layer materials (as the Radon Barrier Materials), which could have the effect to restrain the radon from scattering into the air and the effect of the radiation shielding, we produced the radon barrier materials with crude bentonite on an experimental basis, using the rotary type comprehensive unit for grinding and mixing, through which we carried out the evaluation of the characteristics thereof.
Kawakami, Tomohiko*; Nakano, Natsuko*; Takagi, Kazunari*; Spaziani, F.*; Hanamoto, Yukio*; Abe, Yuta
no journal, ,
no abstracts in English
