Magnetic hysteresis induction with nanocolumnar defects in magnetic insulators

Harii, Kazuya*; Umeda, Maki; Arisawa, Hiroki*; Hioki, Tomosato*; Sato, Nana; Okayasu, Satoru; Ieda, Junichi

Journal of the Physical Society of Japan, 92(7), p.073701_1 - 073701_4, 2023/07

https://doi.org/10.7566/JPSJ.92.073701

Nonlinear magnon polaritons

Lee, O.*; Yamamoto, Kei; Umeda, Maki; Zollitsch, C. W.*; Elyasi, M.*; Kikkawa, Takashi*; Saito, Eiji; Bauer, G. E. W.*; Kurebayashi, Hidekazu*

Physical Review Letters, 130(4), p.046703_1 - 046703_6, 2023/01

https://doi.org/10.1103/PhysRevLett.130.046703

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

https://doi.org/10.4028/www.scientific.net/MSF.778-780.414

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 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/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 -ray doses, and the channel mobility decreased. From this result, it is assumed that hydrogen atoms passivating C dangling bonds are released by -rays and the channel mobility decreases with increasing the C related defects.

Study on potential impacts of natural phenomena on a HLW geological disposal system

Kawamura, Makoto; Makino, Hitoshi; Sasao, Eiji; Niizato, Tadafumi; Yasue, Kenichi; Asamori, Koichi; Umeda, Koji; Ishimaru, Tsuneari; Osawa, Hideaki; Ebashi, Takeshi; et al.

JAEA-Research 2010-027, 85 Pages, 2010/09

JAEA-Research-2010-027.pdf:9.37MB

Japan Atomic Energy Agency (JAEA) have developed a formal evaluation method to assess the potential impacts of natural phenomena (earthquakes and faulting; volcanism; uplift, subsidence, denudation and sedimentation; climatic and sea-level changes) on a high level radioactive waste (HLW) disposal system for the purpose of maintenance of evaluation method for potential impacts of natural phenomena within more realistic view. In this report, we developed a framework as a part of the total system performance assessment for two purposes: the first one is quantification of relationship of characteristic of natural phenomena between geological environmental conditions (T-H-M-C-G), and the other one is quantification of relationship of T-H-M-C-G condition between parameters of performance assessment. We tried to apply the framework to all natural phenomena to confirm the effectiveness of the framework. On the other hand, we applied an argument-diagram that was developed one of the methods of the knowledge management to elicit future tasks. As a result, to apply the framework, we could show that information integration could carry out efficiently, and information integration was attained by the common framework by combining information on geohistory and existing information of natural phenomena and geological environmental conditions as modern-analogue. We could show that suitable scenarios might be chosen by information integration. Furthermore, we were able to elicit future tasks to this study by applying the argument-diagram.

Study on evaluation method of potential impact of natural phenomena on a HLW disposal system

Kawamura, Makoto; Oi, Takao; Niizato, Tadafumi; Yasue, Kenichi; Tokiwa, Tetsuya; Niwa, Masakazu; Shimada, Koji; Kurosawa, Hideki; Asamori, Koichi; Kawachi, Susumu; et al.

JAEA-Research 2008-018, 47 Pages, 2008/03

JAEA-Research-2008-018.pdf:24.18MB

In this report, we sophisticated the framework as a part of the total system performance assessment for two purposes: the first one is quantification of relationship of characteristic of natural phenomena between geological environmental conditions (THMCG), and the other one is quantification of relationship of THMCG condition between parameters of performance assessment. On the other hand, we applied the sophisticated framework to all natural phenomena. As a result, to apply the sophisticated framework, we could show that information integration could carry out efficiently. Moreover, we have checked that the framework was applicable to all phenomena. Furthermore, we could show that suitable scenarios might be chosen by information integration.

Study on evaluation method for potential impacts of "Natural Phenomena" on a HLW disposal system

Kawamura, Makoto; Oi, Takao; Makino, Hitoshi; Umeda, Koji; Niizato, Tadafumi; Ishimaru, Tsuneari; Seo, Toshihiro

Proceedings of 2006 East Asia Forum on Radwaste Management Conference (2006 EAFORM Conference), p.350 - 367, 2006/11

Evaluation for potential impact of natural phenomena ("earthquakes and fault movement", "volcanism", "uplift, subsidence and denudation", and "climatic and sea-level changes") on a High-Level radioactive Waste (HLW) disposal system is an important issue in safety assessment. In order to develop the perturbation scenario considering diverse and complex impact of natural phenomena comprehensively, it is important to identify the key factors to easily classify and organize these impacts and relate these factors with the system performance. In this method, a series of work to construct scenarios is divided into pieces to facilitate to elicit the features of potential impact of natural phenomena on a HLW disposal system and is organized to create reasonable scenarios with consistency, traceability and adequate conservativeness within realistic view.

Study on the procedure of parameter setting for potential effect of natural phenomena on a HLW disposal system

Kawamura, Makoto; Makino, Hitoshi; Oi, Takao; Umeda, Koji; Niizato, Tadafumi; Ishimaru, Tsuneari

no journal, , 

no abstracts in English

Study on perturbation scenario for potential effect of "Uplift and Denudation" on a HLW disposal system

Kawamura, Makoto; Oi, Takao; Niizato, Tadafumi; Yasue, Kenichi; Umeda, Koji; Makino, Hitoshi; Ishimaru, Tsuneari

no journal, , 

JAEA developed a scenario construction method for potential effects of natural phenomena on a HLW disposal system condition and performance as "A framework for examination of potential effect of natural phenomena". In this time, we present application to "Uplift and Denudation". As a result, we certified possibility of the framework to application to "Uplift and Denudation". And using the framework, we are able to organize to elicit the features of potential effect of "Uplift and Denudation" and create various and reasonable scenarios with consistency, traceability and adequate conservativeness within realistic view.

Study on potential effects of natural phenomena; An Approach to bridging the gap between neotectonics and performance assessment

Kawamura, Makoto; Oi, Takao; Umeda, Koji; Niizato, Tadafumi; Ebashi, Takeshi; Kitamura, Akira; Kawachi, Susumu; Makino, Hitoshi; Ishimaru, Tsuneari; Yanagawa, Harunaga*; et al.

no journal, , 

no abstracts in English

Study on information integration for development of perturbation scenario of "uplift and denudation" on performance assessment of a HLW disposal system

Kawamura, Makoto; Niizato, Tadafumi; Yasue, Kenichi; Tokiwa, Tetsuya; Oi, Takao; Kawachi, Susumu; Ishimaru, Tsuneari; Umeda, Koji; Makino, Hitoshi

no journal, , 

no abstracts in English