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Journal Articles

Role of advection in atmospheric ammonia; A Case study at a Japanese lake basin influenced by agricultural ammonia sources

Kubota, Tomohiro; Kuroda, Hisao*; Watanabe, Mirai*; Takahashi, Akiko*; Nakazato, Ryoji*; Tarui, Mika*; Matsumoto, Shunichi*; Nakagawa, Keita*; Numata, Yasuko*; Ouchi, Takao*; et al.

Atmospheric Environment, 243, p.117856_1 - 117856_9, 2020/12

 Times Cited Count:1 Percentile:10.68(Environmental Sciences)

The dry and wet depositions of atmospheric ammonia (NH$$_{3}$$) is one of the important pathways of nitrogen loads to aquatic ecosystems. Crop and livestock agriculture, one of the largest emitters of NH$$_{3}$$ in Asian countries, are known to cause high spatial and seasonal variation of NH$$_{3}$$ and influence the surrounding lake basin areas via its dry and wet deposition. However, the spatial characteristics of the NH$$_{3}$$ concentration in basin scale are not completely understood for regulation in NH$$_{3}$$ emission. Here we aim to clarify dominant factors of spatial and seasonal variations of the NH$$_{3}$$ concentration in a eutrophic lake basin surrounded by agricultural areas in Japan. Passive sampling over various land use categories in the basin was conducted at 36 sites in total from October 2018 to January 2020. Interestingly, the observed NH$$_{3}$$ concentration near the livestock houses were higher in winter than summer, which was inconsistent with knowledge of seasonal changes of current NH$$_{3}$$ emission inventory based on temperature-driven volatilization process. Comparing monthly NH$$_{3}$$ concentrations with various meteorological factors, we suggested the importance of seasonal advection of NH$$_{3}$$ from high emission sources to which has been rarely paid attention by the previous past studies. As for this, should be considered for lake ecosystem management since deposition of NH$$_{3}$$ is known to be closely related to the ecological processes such as phytoplankton blooming.

Journal Articles

Novel thienyl-dibenzothiophene oligomers end-capped by hexylphenyl groups as potential organic semiconductor materials

Duan, Z.*; Yang, Z.*; Hoshino, Daiki*; Hirao, Toshio; Taguchi, Mitsumasa; Ouchi, Hirokuni*; Yanagi, Yuichiro*; Nishioka, Yasushiro*

Molecular Crystals and Liquid Crystals, 567(1), p.28 - 33, 2012/09

 Times Cited Count:3 Percentile:43.99(Chemistry, Multidisciplinary)

$$pi$$-Conjugated polymers and oligomers are of interest for applications to organic light emitting diodes, solar cells, and organic field effect transistors because of their unique photo-electronic properties. Thienyl-dibenzothiophene oligomers end-capped by hexylphenyl groups, 2,8-bis[5-(4-n-hexylphenyl)-2-thienyl]dibenzothiophene and 3,7-bis[5-(4-nhexylphenyl)-2-thienyl]dibenzothiophene, were synthesized by Stille cross-coupling reactions. The photo-physical and electrochemical properties of the synthesized oligomers were investigated by Ultraviolet-visible and photoluminescence spectroscopy, cyclic voltammogram, and thermal analyses, and showed appropriate energy band gaps and low HOMO energy levels. The synthesized oligomers are promising candidate materials for durable organic electronic devices.

Journal Articles

$$gamma$$-ray irradiated organic thin film transistors based on perfluoropentacene with polyimide gate insulator

Takayanagi, Yutaro*; Ouchi, Hirokuni*; Duan, Z.*; Okukawa, Takanori*; Yanagi, Yuichiro*; Yoshida, Akira*; Taguchi, Mitsumasa; Hirao, Toshio; Nishioka, Yasushiro*

Journal of Photopolymer Science and Technology, 25(4), p.493 - 496, 2012/08

 Times Cited Count:0 Percentile:0.01(Polymer Science)

Organic thin film fields effect transistors are expected to be used in spacecrafts/satellites because they can realize large-size, mechanical flexibility, light weight and low-cost devices. N-channel field effect transistors with a Si/polyimide(PI)/perfluoropentacene/Au structure were fabricated, and irradiated with $$gamma$$-ray from Co source. The changes of the drain current vs. source/drain voltage characteristics were measured after every 200 Gy in silicon Gy(Si) irradiations up to the total dose of 1200 Gy(Si). The drain current gradually increased up to the total dose of 1200 Gy(Si). The threshold voltage decreased up to 400 Gy(Si), and gradually recovered above 600 Gy(Si). The mobility was almost unchanged up to 1200 Gy(Si). Those behaviors were explained by accumulation of positive trapped charge within the gate insulator PI near the interface. Evidence for the accumulation of interface traps was hardly observed.

Journal Articles

Upgrade of the transport monitoring system of nuclear materials

Uchida, Shinichi; Yuasa, Wataru; Hayashi, Akihiko; Inose, Shoichi; Ouchi, Yuichiro; Asakawa, Kenichi*; Uchikoshi, Yuta*

Kaku Busshitsu Kanri Gakkai (INMM) Nihon Shibu Dai-32-Kai Nenji Taikai Rombunshu (Internet), 7 Pages, 2011/11

JAEA has developed a TMS which can monitor the movement of nuclear material convoys to make safe and proper transport of nuclear materials. The TMS mainly consists of the location information monitoring system to monitor the location of the convoys and the visual information monitoring system to survey around the convoys. The TMS can send information in real-time to the TCC located at the shipper site. The JAEA has operated the TMS for ground transportation of MOX fuels since 2005, and the JAEA solved visual control problems that were observed during the operational experience and upgraded the system by adding the automatic communication control system, etc. In the case of emergency during transport, the TMS can send much more detailed visual information of the accident site to the TCC, which is useful for planning and executing an effective response. This paper reports the overview of the upgraded TMS and its effectiveness.

Journal Articles

Upgrade of the transport monitoring system of nuclear materials

Yuasa, Wataru; Uchida, Shinichi; Hayashi, Akihiko; Inose, Shoichi; Ouchi, Yuichiro

Proceedings of INMM 52nd Annual Meeting (CD-ROM), 6 Pages, 2011/07

The Japan Atomic Energy Agency (JAEA) has developed a transport monitoring system (TMS), which tracks the movement of nuclear material convoys in real time, and which is consistent with the physical protection requirements for transport of Category 1 nuclear materials. The TMS has been used for land transport of MOX fuels since 2005. JAEA solved some problems that were observed during operational experience and upgraded the system by adding the following features. In the case of emergency during transport, the upgraded TMS can send much more detailed visual information of the accident site to the TCC, which is useful for planning and executing an effective response. This paper presents the features of the TMS and the results obtained from operational experiences.

Journal Articles

Design of a new MOX powder transport packaging to support FBR cycle development mission

Yamamoto, Kiyoaki; Shibata, Hiroshi; Ouchi, Yuichiro; Kitamura, Takafumi; Kamino, Yoshikazu*; Take, Tokuo*

Proceedings of 14th International Symposium on the Packaging and Transportation of Radioactive Materials (PATRAM 2004) (CD-ROM), 10 Pages, 2004/00

no abstracts in English

Journal Articles

Overview of JNC Pu Air Transport Packaging Development

; Kurakami, Junichi; ; ; ; Ouchi, Yuichiro

PATRAM 2001, 0 Pages, 2001/00

None

Journal Articles

Plane Strain Modeling of an Extra-Regulatory Crush Accident

; Ouchi, Yuichiro; ; ; Harding

ASME/JSME PVP Conference, 0 Pages, 1999/00

None

Journal Articles

Detailed 3-D Finite Element Analyses of a Bridge Section Crush Accident

; Ouchi, Yuichiro; ; ; Harding*

ASME/JSME PVP Conference, 0 Pages, 1999/00

None

Oral presentation

Approach for physical protection on nuclear materials transportation

Shibata, Kan; Kitamura, Takafumi; Ouchi, Yuichiro

no journal, , 

no abstracts in English

Oral presentation

A Consideration on issues for safe and secure transport of nuclear materials

Ouchi, Yuichiro

no journal, , 

A Consideration on Issues for Safe and Secure Transport of Nuclear Materials.

Oral presentation

Development of MOX powder packaging

Ouchi, Yuichiro; Kitamura, Takafumi

no journal, , 

The Japan Atomic Energy Agency (JAEA) is planning to procure Mixed Oxide (MOX) powder from the Rokkasho Reprocessing Plant (RRP) of the Japan Nuclear Fuel Limited (JNFL), as raw material to fabricate reload-fuel for the prototype fast breeder reactor "MONJU" and the experimental reactor "JOYO" at about 2014. The diameter of MOX storage canister used in RRP is larger than the one used in the Tokai Reprocessing Plant (TRP) of JAEA, and therefore the canister has a large capacity. Because of this, the existing packagings are not to be used and development of new packaging has started in 2002. The design of the packaging needs to comply with the requirements for Type B(U)F package specified in the TS-R-1 of the IAEA safe transport regulations and has targeted to ensure high performance of sub-criticality and obtain an efficient performance for heat release, considering a large amount of plutonium. The design of the package is found to satisfy those requirements. In order to validate the design, a series of prototype tests using a prototype packaging has been conducted: heat convection test, handling test in RRP and regulation tests (9m drop, fire, etc.). In the paper, features of the new packaging and test results are presented.

Oral presentation

Preparation for MOX powder sea transport by JAEA

Ouchi, Yuichiro; Kitamura, Takafumi; Shibata, Kan; Take, Tokuo*; Kamino, Yoshikazu*; Kawahara, Yasuhiro*

no journal, , 

JAEA is planning to procure MOX powder from the Rokka-sho Reprocessing Plant (RRP) of the JNFL in Aomori prefecture, as raw material to fabricate reloaded-fuel for the prototype fast breeder reactor "MONJU" and the experimental reactor "JOYO" at about 2014. A development of new packaging and a preparation of specialized transport system for responding to requirements of Category I nuclear materials have been implemented. The design of the new packaging started in 2002. A series of prototype tests using a prototype packaging has been con-ducted: heat convection test, handling test in RRP, and regulation tests according to the requirements for Type B(U)F package specified in the TS-R-1 of the IAEA safe transport regulations. The design of the dedicated transport container was conducted to accommodate as many packages as possible, based on an ISO 20-foot container. An assessment of sea transport for MOX powder was also conducted, as part of the safety assessment during transport by ship.

Oral presentation

Future perspective for MOX transport based on experience in JAEA

Kitamura, Takafumi; Tadokoro, Noboru; Shibata, Kan; Ouchi, Yuichiro

no journal, , 

Over 35 years, the Japan Atomic Energy Agency (JAEA) to promote nuclear basic research and nuclear fuel cycle done by its predecessors; JAERI and JNC (PNC) has been accumulating experiences to transport wide range of nuclear materials: MOX fuels and powder for fast breeder reactors, MOX spent fuel for post irradiation examination and uranium fuel elements for test / research reactors, etc.. This paper introduces our experiences in transporting MOX fuels and powder, and additionally technology and system in terms of transport method, emergency preparedness and quality assurance developed reflecting trends in Japan and world, then shows one of future perspectives for MOX transport.

Oral presentation

Future perspective for MOX transport based on experience in JAEA

Kitamura, Takafumi; Tadokoro, Noboru; Ouchi, Yuichiro; Shibata, Kan

no journal, , 

JAERI and JNC (PNC) has been accumulating experiences to transport wide range of nuclear materials: MOX fuels and powder for fast breeder reactors, MOX spent fuel for post irradiation examination and uranium fuel elements for test/research reactors, etc. This paper introduces our experiences in transporting MOX fuels and powder, and additionally technology and system in terms of transport method, emergency preparedness and quality assurance developed reflecting trends in Japan and world, then shows one of future perspectives for MOX transport.

Oral presentation

Development of a sea transport system for MOX powder

Ouchi, Yuichiro; Tadokoro, Noboru; Kitamura, Takafumi; Yoshida, Sachimasa; Kurita, Ichiro

no journal, , 

The Japan Atomic Energy Agency (JAEA) is planning to procure uranium and plutonium mixed oxide (MOX) powder necessary for the prototype fast breeder reactor MONJU and experimental reactor JOYO from Rokkasho Reprocessing Plant (RRP), which is operated by the Japan Nuclear Fuel Limited (JNFL). When both reactors operate as planned, an annual quantity of MOX is estimated at two tons (600 kg of fissile Pu). JAEA has developed a sea transport system including a transport package, shipping containers, vehicles, a ship, and ports, etc., to safely and securely transport large amounts of MOX powder compliant with physical protection measures for Category I materials. This paper describes development of the transport package and shipping container, and will outline the sea transport plan.

Oral presentation

Quantitative estimation of low-LET penumbra area induced by heavy ion particles using OH radical induced guanine damage (8-OHdG ); Further analysis including background noise reduction process

Urano, Kenta; Ito, Atsushi*; Takano, Yuki*; Ouchi, Fumihisa*; Hirayama, Ryoichi*; Furusawa, Yoshiya*; Funayama, Tomoo*; Yokota, Yuichiro*

no journal, , 

To evaluate a role of low LET penumbra region on the biological effects of heavy ions, we have been developing an method for visualizing penumbra using immunofluorescence staining of OH radical-induced guanine damage, 8-OHdG, which was induced on a thin DNA sheet by heavy-ion exposure under aqueous environment. In the last annual meeting, we reported LET and ion species dependence of penumbra area and suggested the increase of penumbra area with increasing LET and particle atomic number. However, the LET dependence seemed to be inconsistent with the theoretical study by Chatterjee and Schaefer. In the present study, we improved image analysis method by adding the reduction procedure of fluorescence background noise.

Oral presentation

Role of advection in atmospheric ammonia; A Case study at a Japanese lake basin influenced by agricultural ammonia sources

Katata, Genki*; Kubota, Tomohiro; Kuroda, Hisao*; Watanabe, Mirai*; Takahashi, Akiko*; Nakazato, Ryoji*; Tarui, Mika*; Matsumoto, Shunichi*; Nakagawa, Keita*; Numata, Yasuko*; et al.

no journal, , 

no abstracts in English

Oral presentation

Quantitative detection of heavy ion induced DNA oxidative damage by immunofluorescence method; Improvement by introducing background noise reduction process

Urano, Kenta; Ito, Atsushi*; Takano, Yuki*; Ouchi, Fumihisa*; Hirayama, Ryoichi*; Furusawa, Yoshiya*; Funayama, Tomoo*; Yokota, Yuichiro*

no journal, , 

no abstracts in English

19 (Records 1-19 displayed on this page)
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