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Maruyama, Yudai*; Takeda, Kiyoko*; Tomooka, Norihiko*; Sato, Katsuya; Ono, Yutaka; Yokoyama, Tadashi*
JAEA-Review 2015-022, JAEA Takasaki Annual Report 2014, P. 99, 2016/02
Shimada, Hiroyuki*; Minami, Hirotake*; Okuizumi, Naoto*; Sakuma, Ichiro*; Ukai, Masatoshi*; Fujii, Kentaro; Yokoya, Akinari; Fukuda, Yoshihiro*; Saito, Yuji
Journal of Chemical Physics, 142(17), p.175102_1 - 175102_9, 2015/05
Times Cited Count:10 Percentile:38.84(Chemistry, Physical)Takeda, Kiyoko*; Sato, Katsuya; Narumi, Issey*; Ono, Yutaka; Otsu, Naoko*; Yokoyama, Tadashi*
JAEA-Review 2014-050, JAEA Takasaki Annual Report 2013, P. 120, 2015/03
Shimada, Hiroyuki*; Fukao, Taishi*; Minami, Hirotake*; Ukai, Masatoshi*; Fujii, Kentaro; Yokoya, Akinari; Fukuda, Yoshihiro*; Saito, Yuji
Journal of Chemical Physics, 141(5), p.055102_1 - 055102_8, 2014/08
Times Cited Count:15 Percentile:54.25(Chemistry, Physical)Takeda, Kiyoko; Sato, Katsuya; Narumi, Issey*; Otsu, Naoko*; Yokoyama, Tadashi*
JAEA-Review 2013-059, JAEA Takasaki Annual Report 2012, P. 114, 2014/03
Shimada, Hiroyuki*; Fukao, Taishi*; Minami, Hirotake*; Ukai, Masatoshi*; Fujii, Kentaro; Yokoya, Akinari; Fukuda, Yoshihiro*; Saito, Yuji
Chemical Physics Letters, 591, p.137 - 141, 2014/01
Times Cited Count:8 Percentile:33.58(Chemistry, Physical)Takeda, Kiyoko; Tejima, Kohei*; Sato, Katsuya; Narumi, Issei; Yokoyama, Tadashi*
JAEA-Review 2012-046, JAEA Takasaki Annual Report 2011, P. 107, 2013/01
Takeda, Kiyoko; Tejima, Kohei; Sato, Katsuya; Narumi, Issei; Yokoyama, Tadashi*
JAEA-Review 2011-043, JAEA Takasaki Annual Report 2010, P. 110, 2012/01
Nagame, Yuichiro
JAEA-Review 2010-071, 47 Pages, 2011/02
The summaries of the 8 research projects conducted through the Reimei Research Program are published for the growth and development of the new researches.
Takeda, Kiyoko*; Tejima, Kohei; Sato, Katsuya; Narumi, Issei; Yokoyama, Tadashi*
JAEA-Review 2010-065, JAEA Takasaki Annual Report 2009, P. 75, 2011/01
Tejima, Kohei; Yokoyama, Tadashi*; Sato, Katsuya; Narumi, Issei
JAEA-Review 2010-065, JAEA Takasaki Annual Report 2009, P. 83, 2011/01
no abstracts in English
Ukai, Masatoshi*; Yokoya, Akinari; Nonaka, Yusuke*; Fujii, Kentaro; Saito, Yuji
Radiation Physics and Chemistry, 78(12), p.1202 - 1206, 2009/12
Times Cited Count:5 Percentile:35.99(Chemistry, Physical)To substantiate the hydrated structure of DNA from the view point of the electronic properties, we developed a new spectroscopic technique of photoelectrons ejected from solutions dissolving biological molecules using soft X-ray synchrotron radiation in combination with liquid jet in vacuum. The experiments are carried out at the BL23SU in SPring-8, Japan. The liquid sample is maintained in the form of continuous micro-beam ( = 20 m) in vacuum and is intersected by a well focused nearly micro-beam of synchrotron-radiation of less than 50 m. In this paper, we present (1) the partial yields of photoelectrons for liquid water molecules and oxygen Auger electron spectra in the energy range around the oxygen K-edge, and (2) the total photoelectron yields for DNA nucleotides (AMP, CMP, and GMP) in water solutions near nitrogen K-edge, which correspond to the X-ray absorption spectra (XANES).
Ikezoe, Hiroshi
JAEA-Review 2009-026, 55 Pages, 2009/09
The summaries of the 8 research projects conducted through the Reimei Research Program are published for the growth and development of the new researches.
Miyamura, Hiroko; Ozahata, Satoshi*; Nakao, Akihiro*; Kawashima, Konosuke*; Suzuki, Yoshio
Shingaku Giho, 109(188), p.85 - 90, 2009/09
We propose a network visualization method for a large-scale file-sharing network dataset. The network dataset has nodes and links that represent the connection between two nodes. When the number of links is large, it is difficult to recognize the structure of the network data, because many links are crossed. In this context, for recognizing the structure and exploring the key nodes, we propose a link-less network visualization method using matrix based representation. In addition, we demonstrate the effectiveness of the proposed method by applying it to the file-sharing network log data.
Motohashi, Kenji*; Saito, Yuichi; Kitazawa, Sin-iti
Journal of Physics; Conference Series, 163, p.012079_1 - 012079_4, 2009/06
Times Cited Count:5 Percentile:84.83Ikezoe, Hiroshi
JAEA-Review 2008-066, 55 Pages, 2009/02
The summaries of the 9 research subjects conducted through the Reimei Research Program are published for the growth and development of the new researches.
Ukai, Masatoshi*; Yokoya, Akinari; Fujii, Kentaro; Saito, Yuji
Radiation Physics and Chemistry, 77(10-12), p.1265 - 1269, 2008/10
Times Cited Count:11 Percentile:59.25(Chemistry, Physical)In order to substantiate the hydrated structure of DNA from the view point of the electronic properties, we develop a new spectroscopic technique for the photoelectrons ejected from solutions dissolving biological molecules using a soft X-ray synchrotron radiation (SPring-8, BL23SU) in combination with liquid jet technique in vacuum. In this paper, we present the first evidence of the spectrum of total photoelectron yields for a nucleotide, guanosine-5'-monophosphate, in solution in the energy region of so-called water window around nitrogen K-edge. A liquid nucleotide/water sample is maintained in the form of continuous thin water jet (diameter 20 m) in vacuum and is intersected by a highly focused soft X-ray beam. The obtained spectrum in solution shows common features with the spectrum in solid film. Nitrogen atoms only exist in the base site, so that the spectral similarities can be explained by the hydrophobic property of the base site.
Maekawa, Yasunari; Suzuki, Yasuyuki; Maeyama, Katsuya*; Yonezawa, Noriyuki*; Yoshida, Masaru
Chemistry Letters, 33(2), p.150 - 151, 2004/02
Times Cited Count:4 Percentile:21.76(Chemistry, Multidisciplinary)Since well-characterized chemical modification of pore inner surfaces in polymer membranes should be very important from the view point of synthetic chemistry of polymer surfaces as well as designing materials for application such as separation membranes and nanoscopic electronic devices, we reported herein the chemical modification of internal surfaces of the cylindrical pores with 0.31 and 0.54 m in diameter through the reaction of the carboxylic acids on the surfaces with the alkylation reagent bearing a pyrene fluorophore. The incorporation of the fluorophore on the pore internal surfaces were successfully confirmed by the fluorescence microscope images of the membrane reacting with the alkylation reagent bearing a pyrene fluorophore.
Maekawa, Yasunari; Suzuki, Yasuyuki; Yoshida, Masaru; Maeyama, Katsuya*; Yonezawa, Noriyuki*
Polymer, 44(8), p.2307 - 2312, 2003/04
Times Cited Count:7 Percentile:29.01(Polymer Science)The preparation of ion track membranes of thermally stable polyimide films has been performed by ion beam irradiation of partially imidized polyamic acid (PAA) films followed by alkaline etching and final imidization. No discernible positive hole patterns were observed on the irradiated films of partially imidized PAA containing sulfonyl linkages, although sulfonyl group is known to be highly sensitive to ion beams. In contrast, positive hole patterns appeared on the irradiated films of the partially imidized PAA with 68-89% imidization degrees that contains sulfonyl linkages along with a methylene group in the main chain. The most contrasty hole patterns with 0.3 m diameter were observed on the irradiated PAA films of 89% imidization degree. The irradiated PAA film with the hole patterns was then transformed to the corresponding polyimide film with curing at 350C for 1 h. From the structural comparison of the polyimides, the possible mechanism for the hole pattern formation is suggested.
Suzuki, Yasuyuki; Maekawa, Yasunari; Yoshida, Masaru; Maeyama, Katsuya*; Yonezawa, Noriyuki*
Chemistry of Materials, 14(10), p.4186 - 4191, 2002/10
Times Cited Count:17 Percentile:53.66(Chemistry, Physical)Dual tone imaging of polyimide films was prepared by Xe ion beam irradiation of partially imidized polyamic acid (PAA) films followed by alkaline etching in aqueous tetramethylammonium hydroxide solution and heating of treated films. In 87% imidized PAA film, ion beam irradiation produced a negative hemispheric structured image with 1.0 mm height and 1.5 mm diameter. In contrast, a positive hole pattern with 0.3 mm diameter appeared on the 82% imidized PAA film. Positive and negative images were considered to be switched by slight change in the balance of scission and crosslinking of the polymer chains, resulting from energy deposition of the ion beam.