Refine your search:     
Report No.
 - 
Search Results: Records 1-20 displayed on this page of 22

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

Preheat effect on titanium plate fabricated by sputter-free selective laser melting in vacuum

Sato, Yuji*; Tsukamoto, Masahiro*; Shobu, Takahisa; Yamashita, Yoshihiro*; Yamagata, Shuto*; Nishi, Takaya*; Higashino, Ritsuko*; Okubo, Tomomasa*; Nakano, Hitoshi*; Abe, Nobuyuki*

Applied Physics A, 124(4), p.288_1 - 288_6, 2018/04

 Times Cited Count:10 Percentile:59.67(Materials Science, Multidisciplinary)

The dynamics of titanium (Ti) melted by laser irradiation was investigated in a synchrotron radiation experiment. As an indicator of wettability, the contact angle between a selective laser melting (SLM) baseplate and the molten Ti was measured by synchrotron X-rays at 30 keV during laser irradiation. As the baseplate temperature increased, the contact angle decreased, down to 28 degrees at a baseplate temperature of 500$$^{circ}$$C. Based on this result, the influence of wettability of a Ti plate fabricated by SLM in a vacuum was investigated. It was revealed that the improvement of wettability by preheating suppressed sputtering generation, and a surface having a small surface roughness was fabricated by SLM in a vacuum.

JAEA Reports

The International Atomic Energy Agency Nuclear Energy Management School 2012

Ohgama, Kazuya; Ando, Yoko; Yamaguchi, Mika; Ikuta, Yuko; Shinohara, Nobuo; Murakami, Hiroyuki; Yamashita, Kiyonobu; Uesaka, Mitsuru*; Demachi, Kazuyuki*; Komiyama, Ryoichi*; et al.

JAEA-Review 2013-004, 76 Pages, 2013/05

JAEA-Review-2013-004.pdf:13.53MB

JAEA together with the Japan Nuclear Human Resource Development Network (JN-HRD Net), the University of Tokyo (UT) and the Japan Atomic Industrial Forum (JAIF) cohosted the IAEA-Nuclear Energy Management School in Tokai Village, aiming that Japan will be the center of nuclear HRD in the Asian region. In the school, not only lectures by IAEA experts, but also lectures by Japanese experts and technical visits were included for foreign participants. The school contributed to the internationalization of Japanese young professionals, development of nuclear human resource of other countries, and enhancement of cooperation between IAEA and Japan. Additionally, collaborative relationship within JN-HRD Net was strengthened by the school. In this report, findings obtained during the preparatory work and the school period are reported for future international nuclear HRD activities in Japan.

JAEA Reports

Annual report of Nuclear Emergency Assistance and Training Center (April 1, 2009 - March 31, 2010)

Kanamori, Masashi; Shirakawa, Yusuke; Yamashita, Toshiyuki; Okuno, Hiroshi; Terunuma, Hiroshi; Ikeda, Takeshi; Sato, Sohei; Terakado, Naoya; Nagakura, Tomohiro; Fukumoto, Masahiro; et al.

JAEA-Review 2010-037, 60 Pages, 2010/09

JAEA-Review-2010-037.pdf:3.11MB

When a nuclear emergency occurs in Japan, the Japan Atomic Energy Agency (JAEA) provides technical support to the National government, local governments, police, fire station and license holder etc. They are designated public organizations conforming to the basic law on emergency preparedness and the basic plan for disaster countermeasures. The Nuclear Emergency Assistance & Training Center (NEAT) of JAEA provides a comprehensive range of technical support activities to an off-site center in case of a nuclear emergency. Specifically, NEAT gives technical advice and information, provides for the dispatch of specialist as required, supplies emergency equipments and materials to the national government and municipal office. NEAT provide various lectures and training course concerning nuclear disaster prevention for those personnel taking an active part in emergency response organizations at normal time. And NEAT researches on nuclear disaster prevention and also cooperate with international organizations. This annual report summarized the activities of JAEA/NEAT in the fiscal year 2009.

Journal Articles

A Neutron crystallographic analysis of phosphate-free ribonuclease A at 1.7 ${AA}$ resolution

Yagi, Daichi*; Yamada, Taro*; Kurihara, Kazuo; Onishi, Yuki*; Yamashita, Masahiro*; Tamada, Taro; Tanaka, Ichiro*; Kuroki, Ryota; Niimura, Nobuo*

Acta Crystallographica Section D, 65(9), p.892 - 899, 2009/09

 Times Cited Count:15 Percentile:79.88(Biochemical Research Methods)

A neutron crystallographic analysis of phosphate-free bovine pancreatic RNase A has been carried out at 1.7 $$AA$$ resolution using the BIX-4 single-crystal diffractometer at the JRR-3 reactor of the Japan Atomic Energy Agency. The high resolution structural model allowed us to determine that His12 acts mainly as a general base in the catalytic process of RNase A. Numerous other distinctive structural features such as the hydrogen positions of methyl groups, hydroxyl groups, prolines, asparagines and glutamines were also determined at 1.7$$AA$$ resolution. The protonation and deprotonation states of all of the charged amino-acid residues allowed us to provide a definitive description of the hydrogen-bonding network around the active site and the H atoms of the key His48 residue. Differences in hydrogen-bond strengths for the $$alpha$$-helices and $$beta$$-sheets were inferred from determination of the hydrogen-bond lengths and the H/D-exchange ratios of the backbone amide H atoms. The correlation between the B factors and hydrogen-bond lengths of the hydration water molecules was also determined.

Journal Articles

Conceptual design of experimental equipment for large-diameter NTD-Si

Yagi, Masahiro; Watanabe, Masanori; Oyama, Koji; Yamamoto, Kazuyoshi; Komeda, Masao; Kashima, Yoichi; Yamashita, Kiyonobu

Applied Radiation and Isotopes, 67(7-8), p.1225 - 1229, 2009/07

 Times Cited Count:9 Percentile:56.98(Chemistry, Inorganic & Nuclear)

Journal Articles

Development of SH Wave Electromagnetic Acoustic Transducer (EMAT)

Yang, X.; Tagawa, Akihiro; Ueda, Masashi; Yamashita, Takuya; Otsuka, Yusuke*; Osafune, Kazunori*; Nishikawa, Masahiro*

The Hellenic Society of N, 0 Pages, 2003/11

This paper describes a new structure of horizontally polarized shear(SH) wave electromagnetic acoustic transducer(EMAT). The EMAT with a Halbach magnet structure shows a stronger magnetic flux density as well as ultrasonic sound pressure than that of an EMAT with a general periodic permanent magnet(PPM) structure. The measured magnetic flux density and the ultrasound directivity distributions for both the Halbach and the PPM structure EMATs are in excellent agreement with those expected form a simulation calculation. The above EMATs were also used for inspection tests of many artificial slits; and it is found that the Halbach one performs a better detectability than the PPM one.

Journal Articles

Angle-resolved photoemission study of the $$MX$$-chain compound [Ni(chxn)$$_2$$Br]Br$$_2$$; Spin-charge separation in hybridized $$d$$-$$p$$ chains

Fujimori, Shinichi; Ino, Akihiro; Okane, Tetsuo; Fujimori, Atsushi; Okada, Kozo*; Manabe, Toshio*; Yamashita, Masahiro*; Kishida, Hideo*; Okamoto, Hiroshi*

Physical Review Letters, 88(24), p.247601_1 - 247601_4, 2002/06

 Times Cited Count:13 Percentile:61.68(Physics, Multidisciplinary)

We report on the results of angle-resolved photoemission experiments on a quasi-one-dimensional $$MX$$-chain compound [Ni(chxn)$$_2$$Br]Br$$_2$$ (chxn = 1$$R$$,2$$R$$-cyclohexanediamine), a one-dimensional Heisenberg system with $$S=1/2$$ and $$Jsim3600$$K, which shows a gigantic non-linear optical effect. A "band" having about 500meV energy dispersion is found in the first half of the Brillouin zone $$(0le kb/pi <1/2)$$, but disappears at $$kb/pisim1/2$$. Two dispersive features, expected from the spin-charge separation, as have been observed in other quasi-one-dimensional systems like Sr$$_2$$CuO$$_3$$, are not detected. These characteristic features are well reproduced by the $$d$$-$$p$$ chain model calculations with a small charge-transfer energy $$Delta$$ compared with that of one-dimensional Cu-O based compounds. We propose that this smaller $$Delta$$ is the origin of the absence of clear spin- and charge-seperation in the photoemission spectra and strong non-linear optical effect in [Ni(chxn)$$_2$$Br]Br$$_2$$.

Journal Articles

Photoemission study of quasi-one-dimensional halogen-bridged compound [Ni(chxn)$$_{2}$$Br]Br$$_{2}$$

Fujimori, Shinichi; Ino, Akihiro; Okane, Tetsuo; Fujimori, Atsushi; Okada, Kozo*; Manabe, Toshio*; Yamashita, Masahiro*; Kishida, Hideo*; Okamoto, Hiroshi*

Surface Review and Letters, 9(2), p.1065 - 1069, 2002/04

 Times Cited Count:0 Percentile:0(Chemistry, Physical)

no abstracts in English

Journal Articles

Neutron scattering study of linear-chain Haldane compounds NDMAZ and NDMAP

Metoki, Naoto; Koike, Yoshihiro; Matsuoka, Yuki; Kobayashi, Tatsuo*; Yamashita, Masahiro*

Journal of Magnetism and Magnetic Materials, 226-230(Part.1), p.414 - 416, 2001/05

no abstracts in English

Journal Articles

Neutron scattering studies in the linear-chain Halden materials, NDMAZ and NDMAP

Koike, Yoshihiro; Metoki, Naoto; Morii, Yukio; Kobayashi, Tatsuo*; Ishii, Tomohiko*; Yamashita, Masahiro*

Journal of the Physical Society of Japan, 69(12), p.4034 - 4042, 2000/12

 Times Cited Count:6 Percentile:47.5(Physics, Multidisciplinary)

no abstracts in English

JAEA Reports

ITER neutral beam injection system; Japanese design proposal

Ohara, Yoshihiro; Tanaka, Shigeru; Akiba, Masato; Araki, Masanori; Fujisawa, Noboru; Hanada, Masaya; Inoue, Takashi; *; Mizuno, Makoto; Okumura, Yoshikazu; et al.

JAERI-M 91-052, 176 Pages, 1991/03

JAERI-M-91-052.pdf:4.07MB

no abstracts in English

Journal Articles

Neutronics of neutral beam injector for ITER; Japanese proposal

Inoue, Takashi; Akiba, Masato; Araki, Masanori; Hanada, Masaya; *; Mizuno, Makoto; Okumura, Yoshikazu; Ohara, Yoshihiro; Seki, Masahiro; Tanaka, Shigeru; et al.

Fusion Engineering and Design, 18, p.369 - 376, 1991/00

 Times Cited Count:2 Percentile:32.61(Nuclear Science & Technology)

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:80.36(Nuclear Science & Technology)

no abstracts in English

Oral presentation

Crystallization of $$beta$$-lactoglobulin, $$alpha$$-amylase, 2Zn-insulin, cubic-insulin and RNase a for neutron diffraction experiment

Yagi, Daichi*; Ebata, Toshinobu*; Ichige, Toshikatsu*; Kobayashi, Yoichiro*; Ishikawa, Takuya*; Yamashita, Masahiro*; Onishi, Yuki*; Tanaka, Ichiro*; Kurihara, Kazuo; Niimura, Nobuo*

no journal, , 

no abstracts in English

Oral presentation

Study of long-term underground water flow system, 2; Attempt of underground water flow movement evaluation that considers climatic variation of coming of the cold period etc

Fuchiwaki, Hirotaka; Munakata, Masahiro; Kimura, Hideo; Imai, Hisashi*; Shiozaki, Isao*; Yamashita, Ryo*

no journal, , 

It is thought that in an external factor that influences the underground flow, there is a climatic variation repeated at the cycle of the order of 100,000 years, the following phenomena are caused by this climatic variation, and it influences the underground flow. It is thought that the following phenomena are caused by this climatic variation, and it influences the underground flow. (1) Development and disappearance of glacier, (2) Change in precipitation, (3) Decrease in amount of training because of development of frozen soil, (4) Sea-level rhythms, (5) Upheaval and erosion by gaining the weight to the earth's crust according to development of river and disappearance, (6) Dilution of seawater according to glacier disappearance, etc. The analytical result and the evaluation are announced.

Oral presentation

Digital image analysis of isotropic graphite porosity using 3D X-ray computed tomography

Sumita, Junya; Shibata, Taiju; Muto, Takenori*; Mihashi, Masahiko*; Sato, Masahiro*; Yamashita, Ryo*; Sakaba, Nariaki

no journal, , 

Since graphite is porous material containing 20% of porosity, the characteristics of graphite strongly depends on shape and volume distribution of pore. It is essential to establish the production method for further reducing the characteristic variation of graphite to produce high quality graphite. Therefore, it is necessary to establish the simple method for prediction of the characteristics of graphite. Although they have been characterized as a function of porosity, it is necessary to characterize them as a function of some detailed factors in order to further reduce the characteristic variation and to characterize them with high accuracy. The authors have been developing the method for predicting the characteristics of graphite by analysis of shape and volume distribution of open pore and closed pore using two and three dimensional images in order to characterize graphite with high accuracy. In the present study, quantity of open pore and closed pore analyzed by a digital image analysis was compared with that measured by a mercury porosimeter. Both results indicated that open pore increased with increasing porosity and closed pore showed almost constant value. However, the volume of closed pore by the mercury porosimeter was measured up to 5% larger than that by the digital image analysis. It is necessary to clarify the correlation between the volume of closed pore analyzed by the digital image analysis and that measured by the mercury porosimeter to measure closed pore with high accuracy by the mercury porosimeter in the next step.

Oral presentation

Evaluation on thermal conductivity of fine-grain isotropic graphite on the basis of its porosity

Sumita, Junya; Shibata, Taiju; Muto, Takenori*; Mihashi, Masahiko*; Sato, Masahiro*; Yamashita, Ryo*; Sakaba, Nariaki

no journal, , 

Graphite materials are used for the in-core components of High Temperature Gas-cooled Reactor (HTGR) which is a graphite-moderated and helium gas-cooled reactor. The HTGR is particularly attractive due to capability of producing high temperature helium gas, and its passive and inherent safety features. The Very High Temperature Reactor (VHTR) is one of the most promising candidates as the Generation-IV nuclear reactor systems. Since the thermal conductivity of graphite is one of important properties to evaluate the maximum core temperature of the VHTR, many researchers investigated and reported it. Graphite material is porous material containing 20% of porosity and the thermal conductivity strongly depends on shape and volume distribution of pore. It is important to evaluate the thermal conductivity as a function of them. In the presentation, the evaluation results of the thermal conductivity for fine-grain isotropic graphite as a function of open pores and closed pores measured by a mercury porosimeter were reported. Moreover, the prediction method for the thermal conductivity considering the amount of open and closed pore was discussed.

Oral presentation

Dependency on pore distribution of thermal property of isotropic graphite

Sumita, Junya; Shibata, Taiju; Mihashi, Masahiko*; Muto, Takenori*; Sato, Masahiro*; Yamashita, Ryo*; Sakaba, Nariaki

no journal, , 

The characteristics of graphite have been characterized as a function of porosity. In order to further reduce the characteristic variation and to characterize them with high accuracy, it is necessary to characterize them as a function of some detailed factors. Therefore, we focused on the open and closed pore of graphite and analyzed them based on two and three dimensional images to develop the prediction method for thermal conductivity of graphite. In the present study, it was reported analytical results of pore distribution and comparison result of predicted thermal conductivity to the experimental one.

Oral presentation

The Effect of porosity on isotropic graphite properties

Mihashi, Masahiko*; Muto, Takenori*; Sato, Masahiro*; Sumita, Junya; Shibata, Taiju; Sakaba, Nariaki; Yamashita, Ryo*

no journal, , 

The large size isotropic graphite is required to have small characteristic variation. Since characteristics of graphite are affected by porosity, in the first stage of improvement of large size graphite, porosity of large size isotropic graphite has been examined using mercury porosimeter.

Oral presentation

Long term thermal aging effect on the SCC initiation susceptibility of L-grade austenitic stainless steel

Kondo, Keietsu; Aoki, So; Yamashita, Shinichiro; Kaji, Yoshiyuki; Yamamoto, Masahiro

no journal, , 

no abstracts in English

22 (Records 1-20 displayed on this page)