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Journal Articles

Temporal variations in metal enrichment in suspended particulate matter during rainfall events in a rural stream

Matsunaga, Takeshi; Tsuzuki, Katsunori; Yanase, Nobuyuki; Kritsananuwat, R.*; Ueno, Takashi; Hanzawa, Yukiko; Naganawa, Hirochika

Limnology, 15(1), p.13 - 25, 2014/01

 Times Cited Count:5 Percentile:21.94(Limnology)

We studied a discharge of heavy metals/metalloids in rainfall events to a rural stream in Kuji River basin of central Japan. In terms of elemental enrichment with respect to the crustal composition, we found similarity between atmospheric deposits and suspended particulate matter (SPM) at a rural stream. Both exhibited distinctive enrichment in several metals (Ni, Cu, Pb, Sb, and Cd). Elemental analysis of SPM in the stream in rainfall events at short intervals revealed that the metal enrichment factors in SPM were progressively decreased with an increase of flow rate. Judging from features of SPM, this phenomenon was probably caused by alternative change of SPM matrices from upper soil constituents to more lithologic material with increasing stream flow rate. In quantification of respective contributions of metals of different origins to fluvial discharge, change of SPM matrices during a rainfall event and involvement of dissolved fraction need to be taken into consideration.

Journal Articles

In-plane orientation control of 2,7-diphenyl[1]benzothieno[3,2-$$b$$][1]benzothiophene monolayer on bismuth-terminated Si(111) vicinal surfaces with wettability optimization

Otomo, Manabu; Tsuchida, Yuya*; Muraya, Naoki*; Yanase, Takashi*; Sakai, Seiji; Yonezawa, Tetsu*; Nagahama, Taro*; Hasegawa, Tetsuya*; Shimada, Toshihiro*

Journal of Physical Chemistry C, 117(22), p.11555 - 11561, 2013/06

 Times Cited Count:2 Percentile:9.84(Chemistry, Physical)

We report in-plane orientation control of newly developed high-mobility organic semiconductor: 2,7-diphenyl[1]benzothieno[3,2-$$b$$][1]benzothiophene (DPh-BTBT). As previously reported on monolayer pentacene, it was revealed that bunched steps on vicinal Si(111) with bismuth termination break the surface symmetry and reduce three-fold symmetry of DPh-BTBT grains into quasi-single orientation. Interestingly, the critical step height necessary for the orientation control was different from that of pentacene. We examined several mechanisms of orientation control and concluded that the facet nano structure fabricated by step bunching is working as an anisotropic template. We will also show the wettability control of bismuth terminated silicon surface and show that the growth mode of DPh-BTBT is dependent on the surface nanostructure of Bi-Si.

JAEA Reports

Consideration for modeling studies of migration of accidentally released radionuclides in a river watershed

Matsunaga, Takeshi; Monte, L.; Tsuzuki, Katsunori; Yanase, Nobuyuki; Hanzawa, Yukiko; Ueno, Takashi

JAERI-Review 2003-039, 150 Pages, 2004/01

JAERI-Review-2003-039.pdf:11.12MB

Concerning radionuclides that might be released in an event of an accident from a nuclear facility, much attention has been paid to the migration pathways including the inflow to surface water bodies since the Chernobyl accident. In order to have discussions related to the current development of a mathematical model of the behavior of radionuclides in a river watershed, JAERI invited a guest scientist specializing in mathematical modeling of radioecology, Luigi Monte of Italian National Agency for New Technologies Energy and the Environment (ENEA: Ente per le Nuove tecnologie,L'Energia e l'Ambiente) of Italy, from May 22 to June 20 of 2003. This report is a summary of presentations and discussion made at the occasion of the visit of Dr. Monte at JAERI and also at relevant institutions of Japan involved in this study field. As a result of these discussions, distinct advantages and key problems of a mathematical model for prediction of the migration of radionuclides in a river watershed have been identified and analyzed.

Journal Articles

Theory of superconductivity in strongly correlated electron systems

Yanase, Yoichi*; Jujo, Takanobu*; Nomura, Takuji; Ikeda, Hiroaki*; Hotta, Takashi; Yamada, Kosaku*

Physics Reports; A Review Section of Physics Letters, 387(1-4), 149 Pages, 2003/11

In this article we review essential natures of superconductivity in strongly correlated electron systems from a universal point of view. Here we consider materials such as high-$$T_{rm c}$$ cuprates, BEDT-TTF organic superconductors, ruthenate Sr$$_2$$RuO$$_4$$, and heavy fermion superconductors. After the review of experimental results, we explain the formalism to discuss superconducting properties of strongly correlated electron systems based on the Dyson-Gor'kov equations. Then, we introduce theoretical retults on cuprates, organics, ruthenate, and heavy fermion superconductors in this order.

Journal Articles

Speciation of environmental radionuclides in the Chernobyl 30km zone

Amano, Hikaru; Hanzawa, Yukiko; Watanabe, Miki*; Matsunaga, Takeshi; Ueno, Takashi; Nagao, Seiya; Yanase, Nobuyuki; Onuma, Yoshikazu*

Proceedings of OECD/NEA Workshop on Evaluation of Speciation Technology, p.211 - 218, 1999/00

no abstracts in English

Journal Articles

Characteristics of distribution and migration of long-lived radionuclides in the Chernobyl 30km zone

Amano, Hikaru; Matsunaga, Takeshi; Ueno, Takashi; Yanase, Nobuyuki; Nagao, Seiya

Proceedings of the 2nd ISTC/SAC Seminar "Large Scale Area Remediation", p.2_75 - 2_81, 1999/00

no abstracts in English

Journal Articles

Iron nodules scavenging uranium from groundwater

Sato, Tsutomu; Murakami, Takashi*; Yanase, Nobuyuki; Isobe, Hiroshi; T.E.Payne*; P.L.Airey*

Environmental Science & Technology, 31(10), p.2854 - 2858, 1997/00

 Times Cited Count:77 Percentile:88.6(Engineering, Environmental)

no abstracts in English

Journal Articles

Natural analogue study in the Koongarra uranium ore deposit, Australia

Onuki, Toshihiko; Murakami, Takashi*; Isobe, Hiroshi; Yanase, Nobuyuki; Sato, Tsutomu

Hoshasei Haikibutsu Kenkyu, 2(1-2), p.137 - 143, 1996/02

no abstracts in English

Journal Articles

Speciation of radionuclides in soils and surface organic matters sampled around the Chernobyl nuclear power plants

Watanabe, Miki*; Amano, Hikaru; Onuma, Yoshikazu*; Ueno, Takashi; Matsunaga, Takeshi; Yanase, Nobuyuki

Proc. of 4th Int. Conf. on Nucl. and Radiochemistry, 2, 4 Pages, 1996/00

no abstracts in English

Journal Articles

5 years research project between RIAP and JAERI on secondary migration of radionuclides in terrestrial and aquatic environment; Some preliminary results

Amano, Hikaru; Matsunaga, Takeshi; Ueno, Takashi; Onuma, Yoshikazu*; Watanabe, Miki*; Yanase, Nobuyuki; Nagao, Seiya; Sukhoruchkin, A. K.*

Proceedings of 5th International Scientific and Technical Conference on the Problems of Liquidation of Chernobyl Accident Consequences, P. 74, 1996/00

no abstracts in English

Journal Articles

The Role of suspended particles in the discharge of $$^{210}$$Pb and $$^{7}$$Be within the Kuji River watershed, Japan

Matsunaga, Takeshi; Amano, Hikaru; Ueno, Takashi; Yanase, Nobuyuki; Kobayashi, Yoshii

Journal of Environmental Radioactivity, 26, p.3 - 17, 1995/00

 Times Cited Count:16 Percentile:50.2(Environmental Sciences)

no abstracts in English

Journal Articles

A Modelling study on the fractionation of uranium among minerals during rock weathering

Onuki, Toshihiko; Murakami, Takashi; Yanase, Nobuyuki

Materials Research Society Symposium Proceedings, Vol.294, p.527 - 533, 1993/00

no abstracts in English

Journal Articles

Development of monitoring system for marine radioactivity; Experiment using water tank

Yanase, Nobuyuki; Ueno, Takashi; Sekine, Keiichi; Kobayashi, Yoshii

Dai-34-Kai Kankyo Hoshano Chosa Kenkyu Seika Rombun Shorokushu; Heisei-3-Nendo, p.96 - 97, 1992/12

no abstracts in English

Journal Articles

Migration of radionuclides through the terrestrial environment; Dependence on chemical and physical forms

Amano, Hikaru; Matsunaga, Takeshi; Ueno, Takashi; Yanase, Nobuyuki; Kobayashi, Yoshii

3rd Int. Symp. on Advanced Nuclear Energy Research; Global Environment and Nuclear Energy, 4 Pages, 1991/00

no abstracts in English

Journal Articles

Simultaneous measurement of Rn progeny and Rn in an experiment house

Amano, Hikaru; Yanase, Nobuyuki; Ueno, Takashi; Matsunaga, Takeshi; *; *

Aerosols: Science,Industry,Health and Environment,Vol. 2, p.837 - 841, 1990/00

no abstracts in English

Journal Articles

Migration behavior of uranium series nuclides in altered quartz-chlorite schist

Onuki, Toshihiko; Murakami, Takashi; Sekine, Keiichi; Yanase, Nobuyuki; Isobe, Hiroshi; Kobayashi, Yoshii

Materials Research Society Symposium Proceedings, Vol. 176, p.607 - 614, 1990/00

no abstracts in English

Oral presentation

Environmental behavior of plutonium isotopes studied at the area of the Chernobyl accident; Transport, partitioning, influences

Matsunaga, Takeshi; Yanase, Nobuyuki; Sanada, Yukihisa; Nagao, Seiya*; Ueno, Takashi; Sato, Tsutomu*; Isobe, Hiroshi*; Amano, Hikaru; Tkachenko, Y.*

no journal, , 

no abstracts in English

17 (Records 1-17 displayed on this page)
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