Kenjiro Obara

Hypocenter migration and crustal seismic velocity distribution observed for the inland earthquake swarms induced by the 2011 Tohoku‐Oki earthquake in NE Japan: implications for crustal fluid distribution and crustal permeability

Takuya Okada, Toru Matsuzawa, Norihito Umino, Keisuke Yoshida et autres

Abstract After the occurrence of the 2011 magnitude 9 Tohoku earthquake, the seismicity in the overriding plate changed. The seismicity appears to form distinct belts. From the spatiotemporal distribution of hypocenters, we can quantify the evolution of seismicity after the 2011 Tohoku …

jp (code pays fourni par la source)

Study on assembly techniques and procedures for ITER tokamak device

Kenjiro Obara, Satoshi Kakudate, Kiyoshi Shibanuma, Hiromi Sago et autres

jp (code pays fourni par la source)

Applications of Natural Earthquake Reflection Profiling Method

Shunichirou Nakagawa, Naoshi Hirata, Kenjiro Obara, Keiji Kasahara et autres

Experimental system for a private ATM network

N. Kudoh, Mariko Suzuki, J.-I. Maeno, Kenjiro Obara

The ATX (asynchronous transmission and exchange) network utilizing current narrowband digital leased lines (up to 6 Mb/s) is proposed. Architecture enhancements in the proposed ATX system are considered. The use of ATM (asynchronous transfer mode) technology in the ATX is evaluated for …

jp (code pays fourni par la source)

Critical element development of internal-access pipe welding/cutting equipment

Kiyoshi Oka, K. Shibanuma, Eiji Tada, Satoshi Kakudate et autres

In D-T burning reactors such as Fusion Experimental Reactor (FER), internal access welding/cutting of cooling pipe for in-vessel components, such as the divertor is inevitably required because of spatial constraints due to the nuclear shield and the available port opening space. For …

jp (code pays fourni par la source)

Development of bore tools for blanket cooling pipe connection in ITER

A. Itoh, Kiyoshi Oka, Satoshi Kakudate, Kenjiro Obara et autres

According to the ITER R&D program, the bore tools for welding, cutting and weld inspection of blanket cooling pipes by the in-pipe access have been developed. In order to meet the ITER requirements, the YAG laser transmitted through a flexible optical fiber …

Exposure to Tritiated Moisture and Decontamination of Components for ITER Remote Maintenance Equipment

Takeshi Higashijima, Kenjiro Obara, Kiyoshi Shibanuma, Koichi Koizumi et autres

Typical materials and elements such as carbon steel, grease lubricant, electric cable and AC servomotor for the ITER remote maintenance equipment were exposed to a tritiated moisture environment to choose the appropriate materials from the viewpoint of tritium contamination / decontamination and …

jp (code pays fourni par la source)

Tritium contamination and decontamination study on materials for ITER remote handling equipment

Yasuhisa Oya, Kazuhiro Kobayashi, Wataru M. Shu, Takeshi Higashijima et autres

jp (code pays fourni par la source)

Decontamination of Candidate Materials for ITER Remote Handling Equipment Exposed to Tritiated Moisture

Yasuhisa Oya, Kazuhiro Kobayashi, Wataru M. Shu, Takumi Hayashi et autres

To optimize tritium removal procedure, behavior on typical materials used in the key parts of the ITER remote handling equipment, has been studied.The samples used in this study were stainless steel 304 with three types of surface finish, aluminum alloy A-5052 with …

jp (code pays fourni par la source)

2P1-J1 Remote Maintenance Robots for ITER

K. Shibanuma, Satoshi Kakudate, Kazuhiro Oka, N. Takeda et autres

jp (code pays fourni par la source)

Mechanical characteristics and position control of vehicle/manipulator for ITER blanket remote maintenance

Satoshi Kakudate, Kiyoshi Oka, Takashi Yoshimi, K. Taguchi et autres

5 Development of Remote Maintenance Technology 5.5 Development of Radiation-Hard Components Chapter

Kiyoshi Shibanuma, Kenjiro Obara