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Journal Articles

Unusual plastic deformation behavior in lath martensitic steel containing high dislocation density

Harjo, S.; Kawasaki, Takuro; Tomota, Yo*; Gong, W.

Materials Science Forum, 905, p.46 - 51, 2017/08

Journal Articles

Quantitative evaluation of texture and dislocations during annealing after hot deformation in austenitic steel using neutron diffraction

Tomota, Yo*; Sato, Shigeo*; Uchida, M.*; Xu, P. G.; Harjo, S.; Gong, W.; Kawasaki, Takuro

Materials Science Forum, 905, p.25 - 30, 2017/08

Journal Articles

Recovery of the electrical characteristics of SiC-MOSFETs irradiated with gamma-rays by thermal treatments

Yokoseki, Takashi; Abe, Hiroshi; Makino, Takahiro; Onoda, Shinobu; Tanaka, Yuki*; Kandori, Mikio*; Yoshie, Toru*; Hijikata, Yasuto*; Oshima, Takeshi

Materials Science Forum, 821-823, p.705 - 708, 2015/07

Journal Articles

Engineering & Related Studies at J-PARC

Harjo, S.; Aizawa, Kazuya; Abe, Jun*; Gong, W.; Ito, Takayoshi*; Kawasaki, Takuro; Iwahashi, Takaaki

Materials Science Forum, 777, p.12 - 18, 2014/04

 Times Cited Count:0 Percentile:100

Journal Articles

C-face interface defects in 4H-SiC MOSFETs studied by electrically detected magnetic resonance

Umeda, Takahide*; Okamoto, Mitsuo*; Arai, Ryo*; Sato, Yoshihiro*; Kosugi, Ryoji*; Harada, Shinsuke*; Okumura, Hajime*; Makino, Takahiro; Oshima, Takeshi

Materials Science Forum, 778-780, p.414 - 417, 2014/02

 Times Cited Count:2 Percentile:18.1

Interface defects of Metal-Oxide-Semiconductors (MOSFETs) fabricated on Carbone (C) face 4H-SiC were investigated by Electrically Detected Magnet Resistance (EDMR). Gate oxide of the MOSFETs was formed by either wet-oxidation and H$$_{2}$$ annealing or dry-oxidation. The values of channel mobility for MOSFETS with wet gate oxide and dry gate oxide are less than 1 and 90 cm$$^{2}$$/Vs, respectively. By EDMR measurement under low temperature (less than 20 K), EDMR signals related to C were detected. The peak height of the signals increased with increasing $$gamma$$-ray doses, and the channel mobility decreased. From this result, it is assumed that hydrogen atoms passivating C dangling bonds are released by $$gamma$$-rays and the channel mobility decreases with increasing the C related defects.

Journal Articles

Influence of beam divergence on pseudo-strain induced in time-of-flight neutron diffraction

Suzuki, Hiroshi; Harjo, S.; Abe, Jun*; Akita, Koichi

Materials Science Forum, 777, p.105 - 111, 2014/02

 Times Cited Count:1 Percentile:35.47

Effects of beam divergence on pseudo-strains observed in time-of-flight (TOF) neutron diffraction, that overlapped with the neutron attenuation effect and the surface-effect were investigated. The through-surface strain scanning on an annealed steel plate was performed in different instrument resolutions by controlling the incident beam divergence. Typical pseudo-strain distributions were observed, but they showed different trend according to the beam divergence. Furthermore, it was demonstrated that the pseudo-strains induced in the strain scanning of coarse grain materials can be suppressed by controlling the incident beam divergence. Therefore, the incident beam divergence must be carefully considered to reduce pseudo-strains in time-of-flight neutron diffractometry.

Journal Articles

Radiation-induced currents in 4H-SiC dosimeters for real-time $$gamma$$-ray dose rate monitoring

Fujita, Natsuko; Iwamoto, Naoya; Onoda, Shinobu; Makino, Takahiro; Oshima, Takeshi

Materials Science Forum, 778-780, p.1042 - 1045, 2014/02

 Times Cited Count:1 Percentile:35.47

A Silicon Carbide (SiC) dosimeter has been exposed to $$gamma$$-rays emitted from a $$^{60}$$Co source in order to test the response of radiation-induced current in the dose rate ranging from 0.4 Gy/h to 4 kGy/h. The SiC dosimeter in this study is a high purity semi-insulating 4H-SiC with nickel and aluminum electrode. The radiation-induced currents in the dosimeter show a linear relationship with the dose rate, and are repeatable and stable.

Journal Articles

Residual strains in ITER conductors by neutron diffraction

Harjo, S.; Hemmi, Tsutomu; Abe, Jun; Gong, W.; Nunoya, Yoshihiko; Aizawa, Kazuya; Ito, Takayoshi*; Koizumi, Norikiyo; Machiya, Shutaro*; Osamura, Kozo*

Materials Science Forum, 777, p.84 - 91, 2014/02

 Times Cited Count:2 Percentile:18.1

Journal Articles

Strain analysis in Geological materials using Neutron diffraction and AE signal measurement at J-PARC/BL19 "TAKUMI"

Abe, Jun*; Sekine, Kotaro*; Harjo, S.; Gong, W.; Aizawa, Kazuya

Materials Science Forum, 777, p.219 - 224, 2014/02

 Times Cited Count:2 Percentile:18.1

Journal Articles

Temperature dependence of electric conductivities in femtosecond laser modified areas in silicon carbide

Deki, Manato*; Oka, Tomoki*; Takayoshi, Shodai*; Naoi, Yoshiki*; Makino, Takahiro; Oshima, Takeshi; Tomita, Takuro*

Materials Science Forum, 778-780, p.661 - 664, 2014/02

 Times Cited Count:2 Percentile:18.1

no abstracts in English

Journal Articles

Defect levels in high purity semi-insulating 4H-SiC studied by alpha particle induced charge transient spectroscopy

Iwamoto, Naoya; Onoda, Shinobu; Fujita, Natsuko; Makino, Takahiro; Oshima, Takeshi

Materials Science Forum, 778-780, p.289 - 292, 2014/02

 Times Cited Count:0 Percentile:100

Journal Articles

Single event gate rupture in SiC MOS capacitors with different gate oxide thicknesses

Deki, Manato*; Makino, Takahiro; Kojima, Kazutoshi*; Tomita, Takuro*; Oshima, Takeshi

Materials Science Forum, 778-780, p.440 - 443, 2014/02

 Times Cited Count:0 Percentile:100

no abstracts in English

Journal Articles

Internal stress measurement of weld part using diffraction spot trace method

Suzuki, Kenji*; Shobu, Takahisa; Shiro, Ayumi; Zhang, S.*

Materials Science Forum, 777, p.155 - 160, 2014/02

 Times Cited Count:2 Percentile:18.1

Journal Articles

Evaluation of ductile damage progress of aluminum single crystal with prior activity of single slip system under tensile loading by using synchrotron white X-ray

Shibano, Junichi*; Kajiwara, Kentaro*; Tsukamoto, Takuya*; kawai, Hirokazu*; Miura, Setsuo*; Zhang, S.*; Shobu, Takahisa; Kobayashi, Michiaki*

Materials Science Forum, 777, p.176 - 181, 2014/02

 Times Cited Count:1 Percentile:35.47

Journal Articles

Residual strain of OFC using synchrotron radiation

Sano, Mutsumi*; Takahashi, Sunao*; Watanabe, Atsuo*; Shiro, Ayumi; Shobu, Takahisa

Materials Science Forum, 777, p.255 - 259, 2014/02

 Times Cited Count:1 Percentile:35.47

Journal Articles

Annealing of electron irradiated, thick, ultrapure 4H SiC between 1100$$^{circ}$$C and 1500$$^{circ}$$C and measurements of lifetime and photoluminescence

Klahold, W. M.*; Devaty, R. P.*; Choyke, W. J.*; Kawahara, Kotaro*; Kimoto, Tsunenobu*; Oshima, Takeshi

Materials Science Forum, 778-780, p.273 - 276, 2014/02

Journal Articles

Impact of carrier lifetime on efficiency of photolytic hydrogen generation by p-type SiC

Miyake, Keiko*; Yasuda, Tomonari*; Kato, Masashi*; Ichimura, Masaya*; Hatayama, Tomoaki*; Oshima, Takeshi

Materials Science Forum, 778-780, p.503 - 506, 2014/02

Journal Articles

Identification of structures of the deep levels in 4H-SiC

Nakane, Hiroki*; Kato, Masashi*; Ichimura, Masaya*; Oshima, Takeshi

Materials Science Forum, 778-780, p.277 - 280, 2014/02

Journal Articles

Effect of neutron attenuation on strain measurement with large gauge volume

Suzuki, Hiroshi; Katsuyama, Jinya; Akita, Koichi

Materials Science Forum, 772, p.33 - 38, 2013/11

 Times Cited Count:1 Percentile:35.47

When measuring residual strain distributions of thick structural components such as thick butt-welds using neutron diffraction, it is required to make a gauge volume larger as well as to shorten neutron path length in a material to obtain sufficient diffraction intensity. In this study, neutron attenuation effect on the strain measurement with a large gauge volume was discussed on the normal strain measurement of a thick butt-weld. Influences of neutron attenuation like an apparent strain change were observed, and it was more noticeable when the gauge volume becomes larger. Therefore, the neutron attenuation effect should be considered in the strain measurement with a large gauge volume, and the neutron absorption corrections certainly play an important role for improvement of reliabilities of strain measurement using neutron diffraction with a large gauge volume.

Journal Articles

Positron annihilation lifetime of irradiated polyimide

Hirade, Tetsuya; Oka, Toshitaka; Morishita, Norio*; Idesaki, Akira; Shimada, Akihiko

Materials Science Forum, 733, p.151 - 154, 2013/00

 Times Cited Count:7 Percentile:3.47

Polyimide polymers such as Kapton show a very good performance at high radiation environment such as in space or in radiation facilities. Positron annihilation lifetime measurement is a widely used method for materials science, and the lifetime of triplet positronium (electron-positron pair) can give important information of free volume of polymers. However, there is no positronium formation in Kapton and hence this method was no applied for polymer studies. Here, we indicated that free positron annihilation lifetime can give information of change of free volume by showing the temperature dependence of the lifetime. We applied this method to study irradiation effects on Kapton and we successfully indicated that the free positron lifetime can be applied for polymer studies.

122 (Records 1-20 displayed on this page)