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Kai, Takeshi; Yokoya, Akinari; Ukai, Masatoshi*; Fujii, Kentaro; Higuchi, Mariko; Watanabe, Ritsuko
no journal, ,
no abstracts in English
Kumagai, Yuta
no journal, ,
no abstracts in English
Kumagai, Yuta
no journal, ,
no abstracts in English
Hata, Kuniki; Yamashita, Shinichi*; Muroya, Yusa*; Katsumura, Yosuke*; Hanawa, Satoshi; Kasahara, Shigeki; Tsukada, Takashi
no journal, ,
To estimate primary yields of chemical species produced from radiolysis of aqueous solutions of high concentrated sodium chloride, a calculation using the diffusion kinetic model was employed. As a result of the sensitivity analysis on rate constants of reactions, it was shown that three reactions involving Cl
ion and OH radical play important roles in the primary yields.
Hoshina, Hiroyuki; Kasai, Noboru; Ueki, Yuji; Saiki, Seiichi; Shibata, Takuya; Iwanade, Akio; Seko, Noriaki
no journal, ,
no abstracts in English
Hiroki, Akihiro; Yamashita, Shinichi*; Taguchi, Mitsumasa; Murakami, Takeshi*
no journal, ,
no abstracts in English
Fujii, Kentaro; Izumi, Yudai; Narita, Ayumi; Yokoya, Akinari
no journal, ,
no abstracts in English
Sakai, Hiroaki; Minei, Shuntaro; Hirade, Tetsuya; Oshima, Nagayasu*; Kobayashi, Yoshinori*; Kinomura, Atsushi*; Suzuki, Ryoichi*
no journal, ,
It was reported that positronium (Ps) formation probability was enhanced very much with very high electric fields. The spur reaction model can not explain this Ps formation. We tried to investigate this Ps formation with high electric fields in polyimide (kapton) that has no Ps formation with no electric field. Then we found out that Ps formation was not possible even at high electric fields. However, the annihilation lifetime of free positrons was elongated and it was probably caused by the positron drift movement.
Izumi, Yudai; Tanaka, Masahito*; Tanigawa, Yoshiaki*; Momoki, Yohei*; Iwai, Miki*; Takenaka, Shun*; Ishiyama, Kimihiro*; Kuroki, Misa*; Muro, Takayuki*; Nakagawa, Kazumichi*
no journal, ,
It is unclear whether natural circular dichroism (NCD) originating from core-absorption of atoms located at various sites, as well as next to the asymmetric carbon, in the molecules can be observed selectively. In this study, we measured NCD spectra of an amino acid, histidine (His) which has three nitrogen atoms, thin film in the nitrogen K-edge energy region and confirmed whether we can pick up the NCD signals originating from each nitrogen atom throughout the molecules. NCD peaks assigned to the 1s 
of the nitrogen atoms in imidazole ring and the 1s 
transition of the nitrogen atoms in imidazole ring and amino group. Imidazole ring and amino group are positioned at the side chain distant from and next to the asymmetric carbon, respectively. This result suggests that NCD spectroscopy in the soft X-ray region can selectively pick up the information on local structure around specific atoms, regardless of the position of atoms in molecules.
Saiki, Seiichi; Okaya, Keiko*; Seko, Noriaki; Kudo, Hisaaki*; Katsumura, Yosuke*
no journal, ,
no abstracts in English
Saiki, Seiichi; Hoshina, Hiroyuki; Shibata, Takuya; Ueki, Yuji; Kasai, Noboru; Seko, Noriaki
no journal, ,
no abstracts in English
Oyama, Tomoko; Hinata, Toru*; Nagasawa, Naotsugu; Oshima, Akihiro*; Washio, Masakazu*; Tagawa, Seiichi*; Taguchi, Mitsumasa
no journal, ,
Micro/nanofabrication of biocompatible and biodegradable poly(L-lactic acid) (PLLA) using quantum beams was evaluated for future bio-device applications. Electron beam nanoimprint lithography was proposed for fabricating micro/nanostructures of radiation-crosslinked-PLLA which has high thermal stability. Also, focused ion beam direct etching enabled controlled micro/nanofabrication of PLLA with C=C bond-rich surfaces which is expected to have good cell attachment properties.
Kimura, Atsushi; Nagasawa, Naotsugu; Taguchi, Mitsumasa
no journal, ,
Cellulose and chitin are plant- and shellfish-derived polysaccharides, respectively, and were irradiated with 
rays in room temperature ionic liquids to produce their chemical gels. The formation yields of the obtained cellulose and chitin gels depended on their initial concentrations, dissolved water content, dissolved oxygen concentration, and irradiation temperature, and reached up to 14 and 86%, respectively.