Refine your search:     
Report No.
 - 
Search Results: Records 1-20 displayed on this page of 20
  • 1

Presentation/Publication Type

Initialising ...

Refine

Journal/Book Title

Initialising ...

Meeting title

Initialising ...

First Author

Initialising ...

Keyword

Initialising ...

Language

Initialising ...

Publication Year

Initialising ...

Held year of conference

Initialising ...

Save select records

Journal Articles

Impacts of friction stir processing on irradiation effects in vacuum-plasma-spray coated tungsten

Ozawa, Kazumi; Tanigawa, Hiroyasu; Morisada, Yoshiaki*; Fujii, Hidetoshi*

Fusion Engineering and Design, 98-99, p.2054 - 2057, 2015/10

 Times Cited Count:1 Percentile:86.11(Nuclear Science & Technology)

Reduced activation ferritic/martensitic steel, as typified by F82H, is a promising candidate for structural material of DEMO fusion reactors. To prevent plasma sputtering, tungsten (W) coating was essentially required. This study aims to examine the irradiation effects on hardness and microstructure of vacuum-plasma-spray coated W-F82H steel, with a special emphasis on the impacts of grain-refining induced by frictional stir processing (FSP). It was revealed that the hardness of the VPS-FSP W after ion-irradiation to 5.4 dpa at 800$$^{circ}$$C were not remarkably changed, where bulk W usually exhibited significant irradiation hardening.

Journal Articles

Modification of vacuum plasma sprayed tungsten coating on reduced activation ferritic/martensitic steels by friction stir processing

Tanigawa, Hiroyasu; Ozawa, Kazumi; Morisada, Yoshiaki*; Noh, S.*; Fujii, Hidetoshi*

Fusion Engineering and Design, 98-99, p.2080 - 2084, 2015/10

 Times Cited Count:7 Percentile:32.99(Nuclear Science & Technology)

The vacuum plasma spray (VPS) technique has been investigated as the most practical method to form Tungsten (W) layer as a plasma facing material in fusion devices. The issues are the thermal conductivity and the strength of VPS-W, i.e., the thermal conductivity of VPS-W were significantly lower than that of the bulk W, and the hardness of VPS-W is much less than that of the bulk W. These are mainly caused by the porous structure of VPS-W. In order to solve these issues, friction stir processing (FPS) was applied on VPS-W in this study. It was suggested that FSP can contribute to significant improvement both in mechanical and thermal properties of VPS-W coating.

Journal Articles

Nitrogen $$K$$-edge soft X-ray natural circular dichroism of histidine thin film

Izumi, Yudai; Tanaka, Masahito*; Tanigawa, Yoshiaki*; Tanabe, Maiko*; Momoki, Yohei*; Iwai, Miki*; Takenaka, Shun*; Ishiyama, Kimihiro*; Kuroki, Misa*; Muro, Takayuki*; et al.

Journal of Physics; Conference Series, 502(1), p.012038_1 - 012038_4, 2014/04

 Times Cited Count:0 Percentile:100

Journal Articles

The Possible interplanetary transfer of microbes; Assessing the viability of ${it Deinococcus}$ spp. under the ISS environmental conditions for performing exposure experiments of microbes in the Tanpopo mission

Kawaguchi, Yuko*; Yang, Y.*; Kawashiri, Narutoshi*; Shiraishi, Keisuke*; Takasu, Masako*; Narumi, Issey*; Sato, Katsuya; Hashimoto, Hirofumi*; Nakagawa, Kazumichi*; Tanigawa, Yoshiaki*; et al.

Origins of Life and Evolution of Biospheres, 43(4-5), p.411 - 428, 2013/10

 Times Cited Count:23 Percentile:25.41(Biology)

Journal Articles

Research and development of a super fast reactor, 8; Heat transfer experiments around a simulated fuel rod with supercritical pressure water

Ezato, Koichiro; Akiba, Masato; Enoeda, Mikio; Suzuki, Satoshi; Seki, Yohji; Tanigawa, Hisashi; Tsuru, Daigo; Mori, Hideo*; Oka, Yoshiaki*

Proceedings of 16th Pacific Basin Nuclear Conference (PBNC-16) (CD-ROM), 6 Pages, 2008/10

no abstracts in English

Journal Articles

Effect of heat treatments on tensile properties of F82H steel irradiated by neutrons

Wakai, Eiichi; Ando, Masami; Sawai, Tomotsugu; Tanigawa, Hiroyasu; Taguchi, Tomitsugu; Stroller, R. E.*; Yamamoto, Toshio; Kato, Yoshiaki; Takada, Fumiki

Journal of Nuclear Materials, 367-370(1), p.74 - 80, 2007/08

 Times Cited Count:7 Percentile:48.81(Materials Science, Multidisciplinary)

no abstracts in English

Oral presentation

Soft X-ray natural circular dichroism spectra of amino acids measured by a transmission method

Izumi, Yudai*; Momoki, Yohei*; Tanigawa, Yoshiaki*; Tanaka, Masahito*; Agui, Akane; Nakagawa, Kazumichi*

no journal, , 

no abstracts in English

Oral presentation

Microbe space exposure experiments at International Space Station (ISS) in the mission Tanpopo

Kawaguchi, Yuko*; Yang, Y.*; Kawashiri, Narutoshi*; Shiraishi, Keisuke*; Sugino, Tomohiro*; Takahashi, Yuta*; Tanigawa, Yoshiaki*; Narumi, Issei; Sato, Katsuya; Hashimoto, Hirofumi*; et al.

no journal, , 

Oral presentation

Resistance of ${it Deinococcus}$ sp. to environmental factors of International Space Station (ISS) orbit; Microbes exposure experiment at ISS in the mission "Tanpopo"

Kawaguchi, Yuko*; Yang, Y.*; Kawashiri, Narutoshi*; Shiraishi, Keisuke*; Shimizu, Yasuyuki*; Sugino, Tomohiro*; Takahashi, Yuta*; Tanigawa, Yoshiaki*; Narumi, Issei; Sato, Katsuya; et al.

no journal, , 

Oral presentation

Tanpopo project; Survival of microbes in outer space

Yokobori, Shinichi*; Kawaguchi, Yuko*; Yang, Y.*; Kawashiri, Narutoshi*; Shiraishi, Keisuke*; Shimizu, Yasuyuki*; Takahashi, Yuta*; Sugino, Tomohiro*; Narumi, Issei; Sato, Katsuya; et al.

no journal, , 

no abstracts in English

Oral presentation

Current status of preparation of TANPOPO mission (astrobiology exposure and micrometeoroid capture experiments) and investigation of survivability of microbes in space

Yokobori, Shinichi*; Kawaguchi, Yuko*; Yang, Y.*; Kawashiri, Narutoshi*; Shiraishi, Keisuke*; Shimizu, Yasuyuki*; Takahashi, Yuta*; Sugino, Tomohiro*; Narumi, Issei; Sato, Katsuya; et al.

no journal, , 

no abstracts in English

Oral presentation

Tanpopo Working Group report; Space exposure of microbes and organic materials

Yokobori, Shinichi*; Kobayashi, Kensei*; Mita, Hajime*; Yabuta, Hikaru*; Nakagawa, Kazumichi*; Narumi, Issei; Hayashi, Nobuhiro*; Tomita, Kaori*; Kawaguchi, Yuko*; Shimizu, Yasuyuki*; et al.

no journal, , 

no abstracts in English

Oral presentation

Current status of preparation of TANPOPO mission (astrobiology exposure and micrometeoroid capture experiments) and investigation of survivability of microbes in space

Yokobori, Shinichi*; Kawaguchi, Yuko*; Shimizu, Yasuyuki*; Kawashiri, Narutoshi*; Shiraishi, Keisuke*; Sugino, Tomohiro*; Takahashi, Yuta*; Yang, Y.*; Tanigawa, Yoshiaki*; Hashimoto, Hirofumi*; et al.

no journal, , 

no abstracts in English

Oral presentation

Nitrogen K-edge soft X-ray natural circular dichroism of histidine thin film

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 $$rightarrow$$ $$pi$$$$^{*}$$ of the nitrogen atoms in imidazole ring and the 1s $$rightarrow$$ $$sigma$$$$^{*}$$ 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.

Oral presentation

Hardness and microstructure after ion-irradiation of vacuum-plasma-splay coated W-F82H refined by friction stir processing

Ozawa, Kazumi; Tanigawa, Hiroyasu; Morisada, Yoshiaki*; Fujii, Hidetoshi*

no journal, , 

no abstracts in English

Oral presentation

Modification of vacuum plasma sprayed tungsten coating by friction stir processing

Tanigawa, Hiroyasu; Ozawa, Kazumi; Morisada, Yoshiaki*; Fujii, Hidetoshi*; Noh, S.*

no journal, , 

no abstracts in English

Oral presentation

The Possible interplanetary transfer of microbes; Assessing the viability of ${it Deinococcus}$ spp. under the ISS environmental conditions for performing exposure experiments of microbes in the Tanpopo mission

Kawaguchi, Yuko*; Yang, Y.*; Kawashiri, Narutoshi*; Shiraishi, Keisuke*; Narumi, Issey*; Sato, Katsuya; Hashimoto, Hirofumi*; Nakagawa, Kazumichi*; Tanigawa, Yoshiaki*; Momoki, Yohei*; et al.

no journal, , 

Oral presentation

Applicability study of Friction-Stir Process on Cu and its irradiation resistivity

Hamaguchi, Dai; Tanigawa, Hiroyasu; Ozawa, Kazumi; Fujii, Hidetoshi*; Morisada, Yoshiaki*

no journal, , 

Friction-Stir Process were applied to OFCCu in order to evaluate the applicability of the process to mechanically strengthening pure-Cu and possible structural improvement on CuCrZr alloy. In this study, the tool rotational speed was varied from 50 to 500 rpm in order to clarify the effect of rotational speed on the process. The result showed the achievement of very fine grain structure at the rotational speed of 100 and 200 rpm and also the hardness increase to about 1.5 time higher within the stir-zone than that of the base metal at the most. However, the result also revealed that the rapid decrease of the hardness toward a depth direction and relatively shallow stir-zone depth compared to a length of the pin. This can be explained as post-annealing effect due to a good thermal conductivity of a pure-Cu. To avoid the effect, we are considering to introduce compulsory cooling system during the process, which application is more important to a CuCrZr alloy because more rapid cooling and lower thermal diffusion to base metal are required.

Oral presentation

Applicability study of Friction-Stir Process on CuCrZr-alloy

Hamaguchi, Dai; Morisada, Yoshiaki*; Fujii, Hidetoshi*; Tanigawa, Hiroyasu; Ozawa, Kazumi

no journal, , 

Friction-Stir Process (FSP) were applied to OFCCu and ITER-Gr CuCrZr cooling pipe in order to evaluate the applicability of the process to mechanically strengthening pure-Cu and possible structural improvement on CuCrZr alloy. Former study revealed that the achievement of very fine grain structure at certain rotational speed and also the hardness increase to about 1.5 time higher within the stir-zone but also relatively shallow stir-zone depth compared to a length of the pin and rapid void formations. In order to avoid this phenomenon, compulsory cooling with liquid Co$$_{2}$$ during the process was introduced, and the results showed the absence of void formation at relatively lower rational speed of around 300 RPM and also maintaining the effective stir-zone to relatively higher rotational speed compared to non-cooling tests. Similar FSP tests with compulsory cooling were also applied to ITER-Gr CuCrZr cooling pipe for divertor application. The detail will be reported on the presentation.

Oral presentation

Investigation of the survivability of ${it Deinococcus}$ spp. under space

Kawaguchi, Yuko*; Yang, Y.*; Murano, Yuka*; Harada, Miyu*; Kawashiri, Narutoshi*; Shiraishi, Keisuke*; Takasu, Masako*; Narumi, Issey*; Sato, Katsuya; Hashimoto, Hirofumi*; et al.

no journal, , 

no abstracts in English

20 (Records 1-20 displayed on this page)
  • 1