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Journal Articles

Evaluation of indoor air dose rate based on Cs-137 depth distribution in surrounding artificially paved surfaces surveyed 10 years after the Fukushima Daiichi Nuclear Power Plant accident

Kobayashi, Hikaru*; Suto, Masahito*; Otsuki, Kentaro*; Yoshimura, Kazuya; Yoshida, Hiroko*

Japan Architectural Review (Internet), 6(1), p.e12353_1 - e12353_12, 2023/00

Journal Articles

Optical detection of organic hydrides with platinum-loaded tungsten trioxide

Yoshimura, Kimio; Hakoda, Teruyuki; Yamamoto, Shunya; Yoshikawa, Masahito

Journal of Physics and Chemistry of Solids, 73(5), p.696 - 698, 2012/05

 Times Cited Count:4 Percentile:19.75(Chemistry, Multidisciplinary)

Tungsten trioxide powder with loading 0.1wt% platinum (Pt/WO$$_{3}$$) was prepared for opticaldetection of organic hydrides such as cyclohexane, decalin by impregnation with PtCl$$_6^{2-}$$ and subsequent calcination in N$$_{2}$$ gas at 500$$^{circ}$$C. The SEM observation of Pt/WO$$_{3}$$ shows that the Pt particles with mean diameters of 80-100 nm were on the surface of the WO$$_{3}$$ powder. The Pt/WO$$_{3}$$ showed coloration for 13% cyclohexane at higher 100$$^{circ}$$C and for 1.3% cyclohexane at 200$$^{circ}$$C. The in-situ XRD results of the Pt/WO$$_{3}$$ in coloring/bleaching change indicate that the coloring of Pt/WO$$_{3}$$ was caused by transformation of WO$$_{3}$$ to tungsten bronze. The analysis of reacted gas demonstrates that Pt on WO$$_{3}$$ produces only hydrogen and benzene through dehydrogenation of cyclohexane over 100$$^{circ}$$C. It was founded that the Pt/WO$$_{3}$$ has potential of optical detection of organic hydrides by heating at higher 100$$^{circ}$$C.

Journal Articles

Synthesis of palladium nanoparticles in a ceramic matrix using radiation grafting method

Yoshimura, Kimio; Hakoda, Teruyuki; Sugimoto, Masaki; Yamamoto, Shunya; Yoshikawa, Masahito

Radiation Physics and Chemistry, 80(4), p.587 - 590, 2011/04

 Times Cited Count:2 Percentile:18.37(Chemistry, Physical)

no abstracts in English

Journal Articles

Dehydrogenation catalyst for optical organic-hydride detection

Yoshimura, Kimio; Hakoda, Teruyuki; Yamamoto, Shunya; Yoshikawa, Masahito

Applied Surface Science, 257(9), p.4428 - 4431, 2011/02

 Times Cited Count:5 Percentile:25.44(Chemistry, Physical)

no abstracts in English

Journal Articles

Detailed structural analysis and dielectric properties of silicon nitride film fabricated using pure nitrogen plasma generated near atmospheric pressure

Hayakawa, Ryoma*; Nakae, Mari*; Yoshimura, Takeshi*; Ashida, Atsushi*; Fujimura, Norifumi*; Uehara, Tsuyoshi*; Tagawa, Masahito*; Teraoka, Yuden

Journal of Applied Physics, 100(7), p.073710_1 - 073710_8, 2006/10

 Times Cited Count:11 Percentile:42.6(Physics, Applied)

A structural analysis and dielectric property measurements of silicon nitride films fabricated using atmospheric pressure (AP) plasma were carried out, and the results were compared to a radio frequency (RF) plasma case. Using AP plasma, 1.8-nm-thick films composed of Si$$_{3}$$N$$_{3.5}$$O$$_{0.7}$$ were obtained in the temperature range from 298 to 773 K. X-ray photoelectron spectroscopy and Rutherford backscattering spectrometry revealed 10% more nitrogen atoms corresponding to the NSi$$_{3}$$ bond in the film using AP plasma than those using RF plasma. In the temperature range, the leakage current densities were not affected by the temperature. Films fabricated at 298 K showed leakage current density of as low as 7$$times$$10$$^{-2}$$A/cm$$^{2}$$ at 5MV/cm. This value was one order of magnitude lower than that using RF plasma.

Journal Articles

Beam-palarization asymmetries for the $$p$$($$overrightarrow{gamma}$$,$$K$$$$^{+}$$)$$Lambda$$ and $$p$$($$overrightarrow{gamma}$$,$$K$$$$^{+}$$)$$Sigma$$$$^{0}$$ reactions for $$E$$$$_{gamma}$$=1.5-2.4 GeV

Zegers, R. G. T.*; Sumihama, Mizuki*; Ahn, D. S.*; Ahn, J. K.*; Akimune, Hidetoshi*; Asano, Yoshihiro; Chang, W. C.*; Dat$'e$, S.*; Ejiri, Hiroyasu*; Fujimura, Hisako*; et al.

Physical Review Letters, 91(9), p.092001_1 - 092001_4, 2003/08

 Times Cited Count:128 Percentile:94.91(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Evidence for a narrow $$S$$ = +1 Baryon resonance in photoproduction from the neutron

Nakano, Takashi*; Ahn, D. S.*; Ahn, J. K.*; Akimune, Hidetoshi*; Asano, Yoshihiro; Chang, W. C.*; Date, S.*; Ejiri, Hiroyasu*; Fujimura, Hisako*; Fujiwara, Mamoru; et al.

Physical Review Letters, 91(1), p.012002_1 - 012002_4, 2003/07

 Times Cited Count:1003 Percentile:99.86(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Study of giant monopole resonance in $$^{58}$$Ni via the ($$vec{p}$$, $$vec{p}$$') reaction at 0$$^{circ}$$

Ishikawa, Takatsugu*; Akimune, Hidetoshi*; Daito, Izuru*; Fujimura, Hisako*; Fujita, Yoshitaka*; Fujiwara, Mamoru; Hatanaka, Kichiji*; Hosono, K.*; Ihara, F.*; Ito, M.*; et al.

Nuclear Physics A, 187(1-2), p.58c - 63c, 2001/04

no abstracts in English

Oral presentation

Comparison of chemical bonding structure at SiN/Si interface fabricated using atmospheric pressure plasma and RF plasma

Hayakawa, Ryoma*; Nakae, Mari*; Yoshida, Shinji*; Tagawa, Masahito*; Teraoka, Yuden; Yoshimura, Takeshi*; Ashida, Atsushi*; Kunugi, Shunsuke*; Uehara, Tsuyoshi*; Fujimura, Norifumi*

no journal, , 

Chemical bonding states of silicon nitride films formed by an atmospheric plasma method and a RF plasma method were analyzed by photoemission spectroscopy with synchrotron radiation and compared each other. The SiN/Si(111) interface formed by the RF plasma method consisted of 5 components. On the other hand, the SiN/Si(111) interface formed by the atmospheric plasma method consisted of 4 components. The Si$$_{3}$$N component is in the interface formed by the RF plasma method.

Oral presentation

Pd-folded ceramic nano fiber synthesis by ion beam irradiation from precursor polymer

Sugimoto, Masaki; Yoshimura, Kimio; Idesaki, Akira; Yoshikawa, Masahito; Seki, Shu*

no journal, , 

no abstracts in English

Oral presentation

Synthesis and properties of metal-chelating polycarbosilane polymer prepared by radiation grafting

Yoshimura, Kimio; Sugimoto, Masaki; Yoshikawa, Masahito

no journal, , 

Polycarbosilane (PCS) polymer with the chelated nickel or palladium was synthesized by the radiation-graft polymerization method. It was found that radicals induced in PCS polymers by electron beam irradiation behave as the sites of graft reaction between PCS polymer and glycidyl methacrylate (GMA) and the degree of graft polymerization was observed to be in proportion to the absorbed dose. After the chelate group was produced in the polymer chain derived from GMA by the reaction with diethylenetriamine, nickel or palladium was introduced into the chelate groups by soaking the solutions of corresponding metal salts. The obtained PCS polymer with the chelated nickel or palladium was fired at 973 K or 1373 K to produce silicon carbide (SiC) ceramics containing nickel or palladium and physical characteristics were measured by XRD, SEM and EDS analysis. As the results, it was found that nickel or palladium is isolated as fine metal grains on the SiC ceramics, i. e., the nickel grains are dispersed with carbon and palladium grains are cohesive on the surface of SiC ceramics.

Oral presentation

Modification of Ag nanoparticles on SiO$$_{2}$$ substrate by ion irradiation

Kawaguchi, Kazuhiro; Yoshimura, Kimio; Yamamoto, Shunya; Yoshikawa, Masahito; Takahiro, Katsumi*

no journal, , 

no abstracts in English

Oral presentation

Polycarbosilane functionalization using quantum beam techniques

Yoshimura, Kimio; Sugimoto, Masaki; Yoshikawa, Masahito

no journal, , 

no abstracts in English

Oral presentation

Modification of Ag nanoparticles on SiO$$_{2}$$ substrate by ion irradiation

Kawaguchi, Kazuhiro; Takahiro, Katsumi*; Yoshimura, Kimio; Yamamoto, Shunya; Yoshikawa, Masahito

no journal, , 

no abstracts in English

Oral presentation

Synthesis of metal containing ceramic nano-fiber by single particle nanofabrication technique, 2

Sugimoto, Masaki; Yoshimura, Kimio; Idesaki, Akira; Yoshikawa, Masahito; Asano, Atsushi*; Seki, Shu*

no journal, , 

no abstracts in English

Oral presentation

Synthesis of functional polycarbosilane nanofiber by ion beam induced radical polymerization

Yoshimura, Kimio; Sugimoto, Masaki; Idesaki, Akira; Yoshikawa, Masahito; Tsukuda, Satoshi*; Seki, Shu*

no journal, , 

no abstracts in English

Oral presentation

Synthesis of catalytic metal-chelating polycarbosilane polymer prepared by radiation grafting

Yoshimura, Kimio; Hakoda, Teruyuki; Sugimoto, Masaki; Yamamoto, Shunya; Yoshikawa, Masahito

no journal, , 

no abstracts in English

Oral presentation

Reduction activity of transition metal and nitrogen doped carbon films prepared by pulsed laser deposition

Yamamoto, Shunya; Hakoda, Teruyuki; Kawaguchi, Kazuhiro; Yoshimura, Kimio; Yamaki, Tetsuya; Kobayashi, Tomohiro*; Yoshikawa, Masahito

no journal, , 

no abstracts in English

Oral presentation

Irradiation-induced change in optical absorption spectra of Ag and Au nanoparticles on SiO$$_{2}$$ substrate

Kawaguchi, Kazuhiro; Takahiro, Katsumi*; Yamamoto, Shunya; Hakoda, Teruyuki; Yoshimura, Kimio; Yoshikawa, Masahito

no journal, , 

no abstracts in English

Oral presentation

Dehydrogenation catalysts for optical organic-hydride detection

Yoshimura, Kimio; Hakoda, Teruyuki; Yamamoto, Shunya; Yoshikawa, Masahito

no journal, , 

no abstracts in English

22 (Records 1-20 displayed on this page)