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Journal Articles

Morphological reproductive characteristics of testes and fertilization capacity of cryopreserved sperm after the Fukushima accident in raccoon (${it Procyon lotor}$)

Komatsu, Kazuki*; Iwasaki, Tsugumi*; Murata, Kosuke*; Yamashiro, Hideaki*; Goh, V. S. T.*; Nakayama, Ryo*; Fujishima, Yohei*; Ono, Takumi*; Kino, Yasushi*; Shimizu, Yoshinaka*; et al.

Reproduction in Domestic Animals, 56(3), p.484 - 497, 2021/03

 Times Cited Count:9 Percentile:88.06(Agriculture, Dairy & Animal Science)

We have established an archive system of livestock and wild animals from the surrounding ex-evacuation zone. Wildlife within the alert zone have been exposed to low-dose-rate (LDR) radiation for a long and continuous time. In this study, we analysed the morphological characteristics of the testes and in vitro fertilization (IVF) capacity of cryopreserved sperm of raccoons from the ex-evacuation zone of the FDNPP accident. This study revealed that the chronic and LDR radiation exposure associated with the FDNPP accident had no adverse effect on the reproductive characteristics and functions of male raccoons.

Journal Articles

Experimental and theoretical studies on oxidation of Cu-Au alloy surfaces; Effect of bulk Au concentration

Okada, Michio*; Tsuda, Yasutaka*; Oka, Kohei*; Kojima, Kazuki*; Di$~n$o, W. A.*; Yoshigoe, Akitaka; Kasai, Hideaki*

Scientific Reports (Internet), 6, p.31101_1 - 31101_8, 2016/08

 Times Cited Count:24 Percentile:71.94(Multidisciplinary Sciences)

We report results of our experimental and theoretical studies on the oxidation of Cu-Au alloy surfaces, viz., Cu$$_{3}$$Au(111), CuAu(111), and Au$$_{3}$$Cu(111), using hyperthermal O$$_{2}$$ molecular beam (HOMB). We observed strong Au segregation to the top layer of the corresponding clean (111) surfaces. This forms a protective layer that hinders further oxidation into the bulk. The higher the concentration of Au in the protective layer formed, the higher the protective efficacy. As a result, of the three Cu-Au surfaces studied, Au$$_{3}$$Cu(111) is the most stable against dissociative adsorption of O$$_{2}$$, even with HOMB. We also found that this protective property breaks down for oxidations occurring at temperatures above 300 K.

Journal Articles

Towards optimizing the performance of self-regenerating Pt-based perovskite catalysts

Jarrige, I.*; Ishii, Kenji; Matsumura, Daiju; Nishihata, Yasuo; Yoshida, Masahiro*; Kishi, Hirofumi*; Taniguchi, Masashi*; Uenishi, Mari*; Tanaka, Hirohisa*; Kasai, Hideaki*; et al.

ACS Catalysis, 5(2), p.1112 - 1118, 2015/02

 Times Cited Count:16 Percentile:44.2(Chemistry, Physical)

Journal Articles

In situ XAFS and HAXPES analysis and theoretical study of cobalt polypyrrole incorporated on carbon (CoPPyC) oxygen reduction reaction catalysts for anion-exchange membrane fuel cells

Asazawa, Koichiro*; Kishi, Hirofumi*; Tanaka, Hirohisa*; Matsumura, Daiju; Tamura, Kazuhisa; Nishihata, Yasuo; Saputro, A. G.*; Nakanishi, Hiroshi*; Kasai, Hideaki*; Artyushkova, K.*; et al.

Journal of Physical Chemistry C, 118(44), p.25480 - 25486, 2014/11

 Times Cited Count:15 Percentile:45.08(Chemistry, Physical)

Journal Articles

The Effects of alloying and segregation for the reactivity and diffusion of oxygen on Cu$$_{3}$$Au(111)

Oka, Kohei*; Tsuda, Yasutaka*; Makino, Takamasa*; Okada, Michio*; Hashinokuchi, Michihiro*; Yoshigoe, Akitaka; Teraoka, Yuden; Kasai, Hideaki*

Physical Chemistry Chemical Physics, 16(36), p.19702 - 19711, 2014/08

 Times Cited Count:11 Percentile:40.66(Chemistry, Physical)

Journal Articles

Design concept of the precious-metal-free automotive catalyst using copper oxide and alloys

Nishihata, Yasuo; Tanaka, Hirohisa*; Mitachi, Senshu*; Kasai, Hideaki*

Kogyo Zairyo, 62(5), p.41 - 44, 2014/05

no abstracts in English

Journal Articles

Initial stages of Cu$$_{3}$$Au(111) oxidation; Oxygen induced Cu segregation and the protective Au layer profile

Tsuda, Yasutaka*; Oka, Kohei*; Makino, Takamasa*; Okada, Michio*; Di$~n$o, W. A.*; Hashinokuchi, Michihiro*; Yoshigoe, Akitaka; Teraoka, Yuden; Kasai, Hideaki*

Physical Chemistry Chemical Physics, 16(8), p.3815 - 3822, 2014/02

 Times Cited Count:14 Percentile:49.2(Chemistry, Physical)

Journal Articles

A Theoretical study of the reactivity of Cu$$_{2}$$O(111) surfaces; The Case of NO dissociation

Kishi, Hirofumi*; Padama, A. A. B.*; Arevalo, R. L.*; Moreno, J. L. V.*; Kasai, Hideaki*; Taniguchi, Masashi*; Uenishi, Mari*; Tanaka, Hirohisa*; Nishihata, Yasuo

Journal of Physics; Condensed Matter, 24(26), p.262001_1 - 262001_5, 2012/07

 Times Cited Count:9 Percentile:38.45(Physics, Condensed Matter)

no abstracts in English

Journal Articles

NO dissociation on Cu(111) and Cu$$_{2}$$O(111) surfaces; A Density functional theory based study

Padama, A. A. B.*; Kishi, Hirofumi*; Arevalo, R. L.*; Moreno, J. L. V.*; Kasai, Hideaki*; Taniguchi, Masashi*; Uenishi, Mari*; Tanaka, Hirohisa*; Nishihata, Yasuo

Journal of Physics; Condensed Matter, 24(17), p.175005_1 - 175005_6, 2012/05

 Times Cited Count:38 Percentile:78.65(Physics, Condensed Matter)

no abstracts in English

Journal Articles

Effects of vibrational and rotational excitations on the dissociative adsorption of O$$_{2}$$ on Cu surfaces

Moritani, Kosuke*; Tsuda, Muneyuki*; Teraoka, Yuden; Okada, Michio*; Yoshigoe, Akitaka; Fukuyama, Tetsuya*; Kasai, Toshio*; Kasai, Hideaki*

Journal of Physical Chemistry C, 111(27), p.9961 - 9967, 2007/07

 Times Cited Count:14 Percentile:46.01(Chemistry, Physical)

We report an X-ray photoemission study of the dissociative adsorption of O$$_{2}$$ at Cu(111), (001), and (110) surfaces with an O$$_{2}$$ molecular beam generated with a variable temperature nozzle. The O-uptake curves, which are produced from precisely measured O-1s peaks, indicate that the dissociative absorption is enhanced as the nozzle temperature is increased up to 1000 K for the normal incidence of O$$_{2}$$ at a kinetic energy of 0.5 eV. However, further increasing the nozzle temperature to 1400 K reduces the probability of dissociativeadsorption. These results suggest that vibrational excitations of incident O$$_{2}$$ assist dissociative adsorption while rotational excitations hinder it.

Journal Articles

Tuning of dissociative-adsorption processes on Cu{1 0 0} by controlling the kinetic energy of the impinging O$$_{2}$$ molecule

Okada, Michio*; Moritani, Kosuke; Yoshigoe, Akitaka; Teraoka, Yuden; Nakanishi, Hiroshi*; Di$~n$o, W. A.*; Kasai, Hideaki*; Kasai, Toshio*

Chemical Physics, 301(2-3), p.315 - 320, 2004/06

 Times Cited Count:14 Percentile:41.96(Chemistry, Physical)

O$$_{2}$$ molecules adsorb dissociatively on Cu{1 0 0} surfaces to form the oxygen-saturated surface with the coverage of 0.5 ML. It has been found that the oxidation has proceeded more than 0.5 ML by using 2.3-eV-O$$_{2}$$ molecular beams. The kinetics of the adsorption reaction was the first order. This reveals that the collision-induced adsorption results in the adsorption of only one oxygen atom. On the other hand, the reaction kinetics showed the second order in the case of 0.6-eV-O$$_{2}$$ incidence. This implies that tentative molecular adsorption takes place in such low collision energy case.

Journal Articles

Absolute calibration of a normal incidence vacuum spectrometer for fusion plasma diagnostics

Kubo, Hirotaka; Sakasai, Akira; *; Koide, Yoshihiko; Akaoka, Nobuo*; *; Chiba, Shinichi; Sugie, Tatsuo; Takeuchi, Hiroshi; Yokomizo, Hideaki; et al.

Photon Factory Activity Report, P. 277, 1989/00

no abstracts in English

Journal Articles

Multichordal spectroscopy on JT-60

Kubo, Hirotaka; Sugie, Tatsuo; Sakasai, Akira; Koide, Yoshihiko; *; Yokomizo, Hideaki*; *; JT-60 Team; Tanaka, Kenichiro*; *; et al.

Review of Scientific Instruments, 59(8), p.1515 - 1517, 1988/09

 Times Cited Count:27 Percentile:91.15(Instruments & Instrumentation)

no abstracts in English

Journal Articles

The JT-60 diagnostic system

Yokomizo, Hideaki; Takeuchi, Hiroshi; Sugie, Tatsuo; Ogiwara, Norio; Sato, Masayasu; Nagashima, Akira; ; Nakamura, Yukiharu; Nishitani, Takeo; Neyatani, Yuzuru; et al.

Fusion Engineering and Design, 5, p.117 - 138, 1987/00

 Times Cited Count:15 Percentile:79.73(Nuclear Science & Technology)

no abstracts in English

Oral presentation

Effects of vibrational and rotational excitations on the dissociative adsorption of O$$_{2}$$ on Cu surfaces

Moritani, Kosuke*; Tsuda, Muneyuki*; Teraoka, Yuden; Okada, Michio*; Yoshigoe, Akitaka; Fukuyama, Tetsuya*; Kasai, Toshio*; Kasai, Hideaki*

no journal, , 

Oxygen molecules adsorbe dissociatively at Cu(111), Cu(110), and Cu(001) surfaces. The oxygen uptake curves were investigated by using supersonic molecular beam techniques and photoemission spectroscopy with synchrotron radiation. Adsorption probability increased with increasing translational kinetic energy of oxygen molecules. Vibrational and rotational levels of oxygen molecules were excited by elevation of nozzle temperature up to 1400 K keeping the incident energy of 0.5 eV. Although the adsorption probability increased with increasing nozzle temperature by 1000 K, it decreased inversely around 1400 K. These phenomena were interpreted as adsorption probability increase by vibrational excitation and decrease by rotational excitation.

Oral presentation

Initial stages of Cu$$_{3}$$Au(111) oxidation

Tsuda, Yasutaka*; Makino, Takamasa*; Hashinokuchi, Michihiro*; Okada, Michio*; Oka, Kohei*; Di$~n$o, W. A.*; Kasai, Hideaki*; Yoshigoe, Akitaka; Teraoka, Yuden

no journal, , 

Oral presentation

The Protective layer formation on Cu$$_{3}$$Au(111) surface

Tsuda, Yasutaka*; Oka, Kohei*; Makino, Takamasa*; Lehmuskoski, J.*; Okada, Michio*; Di$~n$o, W. A.*; Kasai, Hideaki*; Yoshigoe, Akitaka; Teraoka, Yuden

no journal, , 

no abstracts in English

17 (Records 1-17 displayed on this page)
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