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Nondestructive high-sensitivity measurement method for activation estimation in accelerator room concrete

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辐射防护 2020年第6期40卷 677-682页

作者： hiroshi matsumura Go Yoshida Akihiro Toyoda Kazuyoshi Masumoto Hajime Nakamura Taichi Miura Koichi Nishikawa Kotaro Bessho Kimikazu Sasa Tetsuaki Moriguchi Fumiyoshi Nobuhara Yoko Nagashima High Energy Accelerator Research Organization(KEK) Oho 1-1Tsukuba Ibaraki 305-0801Japan University of Tsukuba 1-1-1 TennodaiTsukubaIbaraki 305-8577Japan Tokyo Nuclear Services Co. Ltd.1-3-5.TaitoTaito-kuTokyo 110-0016Japan

This study established a method for easily and quickly estimating the specific activity produced in the concrete walls and floors of accelerator rooms during long-term operation of accelerator,for advanced zoning of activated/nonactivated areas in planning the decommissioning of an *** propose a new,highly sensitive method for nondestructively estimating the specific activity in concrete that can be applied to activation *** this method,instead of direct determination of the specific activities of important long-half-life radionuclides for decommissioning,such as 152 Eu and 60 Co,we determine the specific activities of short-half-life radionuclides,24 Na and 56 Mn,in situ to obtain neutron *** obtained neutron flux and accelerator operation history yield the specific activities of 152 Eu and 60 Co for the advance zoning of activated/non-activated *** method is a powerful long-term prediction tool for concrete activation.

关键词： accelerator activation concrete specific activity decommissioning

Histopathology of type C liver disease for determining hepatocellular carcinoma risk factors

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World Journal of Gastroenterology 2013年第30期19卷 4887-4896页

作者： hiroshi matsumura Kazushige Nirei Hitomi Nakamura Teruhisa Higuchi Yasuo Arakawa Masahiro Ogawa Naohide Tanaka Mitsuhiko Moriyama Division of Gastroenterology and Hepatology Department of MedicineNihon University School of MedicineTokyo173-8610Japan

AIM:To evaluate the histopathological findings of type C liver disease to determine risk factors for development of hepatocellular carcinoma(HCC).METHODS:We studied 232 patients,who underwent liver biopsy for type C chronic liver disease between 1992 and 2009,with sustained virological response(SVR)after interferon *** patients were divided into two groups according to the F stage 0+1+2 group(n = 182)and F3+4 group(n = 50).We prospectively observed and compared the incidence of HCC of the patients with SVR in the F0+1+2 and F3+4 ***,the background factors and liver histopathological findings,including the degree of fibrosis,F stage,inflammation,necrosis,bile duct obstruction,fat deposition,and degree of irregular regeneration(IR)of hepatocytes,were correlated with the risk of developing ***:HCC developed in three of 182(1.6%)patients in the F0+1+2 group,and four of 50(8.0%)in the F3+4 *** cumulative incidence of HCC in the former group was found to be significantly lower than in the F3+4 group(log rank test P = 0.0224).The presence of atypical hepatocytes among IR of hepatocytes in the F3+4 group resulted in a higher cumulative incidence of HCC,and was significantly correlated with risk of HCC development(RR = 20.748,95%CI:1.335-322.5,P = 0.0303).CONCLUSION:Atypical hepatocytes among the histopathological findings of type C liver disease may be an important risk factor for HCC development along with progression of liver fibrosis.

关键词： Hepatocellular carcinoma Irregular regeneration of hepatocytes Liver fibrosis Type C chronic liver disease Histopathology of liver biopsy

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日本钢结构柱梁连接处的机器人焊接

电焊机 2009年第9期39卷 24-28页

作者：松村浩史竹内直记神户制钢所株式会社焊接公司

日本的建筑构造物中约有35%是钢结构件。为了得到高生产率以及高品质的焊接,从1985年前后开始,在柱梁连接处应用机器人焊接,现在几乎全部的钢结构制作公司都采用了机器人焊接。就机器人焊接的普及原因进行了总结,并对应用于钢结构的焊... 详细信息

日本的建筑构造物中约有35%是钢结构件。为了得到高生产率以及高品质的焊接,从1985年前后开始,在柱梁连接处应用机器人焊接,现在几乎全部的钢结构制作公司都采用了机器人焊接。就机器人焊接的普及原因进行了总结,并对应用于钢结构的焊接机器人系统进行了介绍。

关键词：钢结构构造机器人焊接柱梁连接处梁贯通形式柱贯通形式

Hybrid Rubisco with Complete Replacement of Rice Rubisco Small Subunits by Sorghum Counterparts Confers C4 Plant-like High Catalytic Activity

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Molecular Plant 2020年第11期13卷 1570-1581页

作者： Hiroyoshi matsumura Keita Shiomi Akito Yamamoto Yuri Taketani Noriyuki Kobayashi Takuya Yoshizawa Shun-ichi Tanaka Hiroki Yoshikawa Masaki Endo hiroshi Fukayama Department of Biotechnology College of Life SciencesRitsumeikan University1-1-1 Noji-HigashiKusatsu 525-8577Japan Graduate School of Agricultural Science Kobe University1-1 Rokkodai-tyouNada-kuKobe 657-8501Japan Faculty of Agriculture Kobe University1-1 Rokkodai-tyouNada-kuKobe 657-8501Japan Division of Applied Genetics Institute of Agrobiological SciencesNational Agriculture and Food Research Organization1-2 OwashiTsukuba 305-8634Japan Department of Biomolecular Chemistry Kyoto Prefectural UniversityHangi-choShimogamoSakyo-kuKyoto 606-8522Japan

Photosynthetic rate at the present atmospheric condition is limited by the CO2-fixing enzyme ribulose-1,5-bisphosphate carboxylase/oxygenase(Rubisco)because of its extremely low catalytic rate(kcat)and poor affinity for C02(Kc)and specificity for CO2(Sc/O).Rubisco in C4 plants generally shows higher k cat than that in C3 *** consists of eight large subunits and eight small subunits(RbcS).Previously,the chimeric incorporation of sorghum C4-type RbcS significantly increased the k cat of Rubisco in a C3 plant,*** this study,we knocked out rice RbcS multigene family using the CRISPR-Cas9 technology and completely replaced rice RbcS with sorghum RbcS in rice *** hybrid Rubisco showed almost C4 plant-like catalytic properties,i.e.,higher kcai,higher Kc,and lower Sc/*** lines expressing the hybrid Rubisco accumulated reduced levels of Rubisco,whereas they showed slightly but significantly higher photosynthetic capacity and similar biomass production under high C 02 condition compared with wild-type ***-resolution crystal structural analysis of the wild-type Rubisco and hybrid Rubisco revealed the structural differences around the central pore of Rubisco and the pC-pD hairpin in *** propose that such differences,particularly in the pC-pD hairpin,may impact the flexibility of Rubisco catalytic site and change its catalytic properties.

关键词： CRISPR-Cas9 C4 plant photosynthesis rice Rubisco

A comparative study on demineralization of coals by acid-washing and solvent-extraction methods for low temperature catalytic coal gasification application

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Carbon Resources Conversion 2019年第3期2卷 175-181页

作者： Atul Sharma Akimitsu matsumura Research Institute of Energy Frontier Non-conventional Carbon Resources GroupNational Institute of Advanced Industrial Science&Technology16-1OnogawaTsukubaJapan

Catalytic coal gasification is an efficient way to achieve high conversion rates at low *** loss due to the reaction between the inherent mineral matter in the coal and the catalyst is a major hurdle for its practical *** problem may be overcome by removing the mineral matter from the coal before *** demineralizing approaches,acid-washing and solvent-extraction methods are investigated for demineralizing the *** analysis,XRD analysis,NMR analysis,and N_(2)adsorption analysis were made to compare the demineralization efficiency,crystallographic carbon microstructure,chemical structure,and micro-porosity,***-extraction method was found be more efficient for *** was observed in the chemical structure and micro-porosity while crystallographic carbon-microstructure was found to be ***-catalytic and catalytic gasification reactivity of the chars obtained by the two methods was *** composition and gas evolution profiles were also obtained and found to be influenced by the degree of demineralization.

关键词： Coal Demineralization Acid washing Solvent extraction Catalytic gasification

Negative thermal expansion and phase transition of low-temperature Mg_(2)NiH_(4)

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Journal of Magnesium and Alloys 2023年第9期11卷 3338-3349页

作者： Qun Luo Qi Cai Qinfen Gu Yu Shi Bin Liu Xuan Quy Tran Syo matsumura Tong-Yi Zhang Kazuhiro Nogita Tao Lyu Qian Li Fusheng Pan State Key Laboratory of Advanced Special Steel&Shanghai Key Laboratory of Advanced Ferrometallurgy&School of Materials Science and Engineering Shanghai UniversityShanghai 200444China Materials Genome Institute Shanghai UniversityShanghai 200444China Australian Synchrotron ANSTO800 Blackburn RoadClaytonVictoria 3168Australia Department of Applied Quantum Physics and Nuclear Engineering Kyushu UniversityFukuoka 819-0395Japan Nihon Superior Centre for the Manufacture of Electronic Materials(NS CMEM) School of Mechanical and Mining EngineeringThe University of QueenslandBrisbaneQueensland 4072Australia National Engineering Research Center for Magnesium Alloy Chongqing UniversityChongqing 400044China

The negative thermal expansion(NTE) phenomenon is of great significance in fabricating zero thermal expansion(ZTE) materials to avoid thermal shock during heating and cooling. NTE is observed in limited groups of materials, e.g., metal cyanides, oxometallates, and metalorganic frameworks, but has not been reported in the family of metal hydrides. Herein, a colossal and continuous negative thermal expansion is firstly developed in the low-temperature phases of LT1-and LT2-Mg_(2)NiH_(4) between 488 K and 733 K from in-situ transmission electron microscope(TEM) video, with the volume contraction reaching 18.7% and 11.3%, respectively. The mechanisms for volume contraction of LT1 and LT2 phases are elucidated from the viewpoints of phase transformation, magnetic transition, and dehydrogenation, which is different from common NTE materials containing flexible polyhedra units in the structure. The linear volume shrinkage of LT2 in the temperature of 488-553 K corresponds to the phase transition of LT2→HT with a thermal expansion coefficient of -799.7 × 10^(-6) K^(-1) revealed by in-situ synchrotron powder X-ray diffraction. The sudden volume contraction in LT1 between 488 and 493 K may be caused by the rapid dehydrogenation of LT1 to Mg_(2)Ni. The revealed phenomenon in single composite material with different structures would be significant for preparing zero thermal expansion materials by tuning the fraction of LT1 and LT2 phases.

关键词： Negative thermal expansion Mg_(2)NiH_(4) Phase transformation In situ TEM In situ XRD

A general extension theorem for cohomology classes on non reduced analytic subspaces

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Science China Mathematics 2017年第6期60卷 949-962页

作者： CAO JunYan DEMAILLY Jean-Pierre matsumura Shin-ichi Institut de Mathématiques de Jussieu UniversitéPierre et Marie CurieParis 75252France Institut Fourier UniversitéGrenoble AlpesGlares 38610France Mathematical Institute Tohoku UniversitySendal 980-8578Japan

The main purpose of this paper is to generalize the celebrated L^2 extension theorem of Ohsawa and Takegoshi in several directions: The holomorphic sections to extend are taken in a possibly singular hermitian line bundle, the subvariety from which the extension is performed may be non reduced, the ambient manifold is K¨ahler and holomorphically convex, but not necessarily compact.

关键词： compact Khler manifold singular hermitian metric coherent sheaf cohomology Dolbeault cohomology plurisubharmonic function L^2 estimates Ohsawa-Takegoshi extension theorem multiplier ideal sheaf

Development of a GIS-based Decision Support System for Assessing Land Use Status

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Geo-Spatial Information Science 2004年第1期7卷 72-78页

作者： Ryosuke Shibasaki Kanichiro matsumura Center for Spatial Information Science The University of Tokyo 4-6-1 Tokyo Japan

The objectives of this study are to assess land s ui tability and to predict the spatial and temporal changes in land use types (LUTs ) by using GIS-based land use management decision support system. A GIS databas e with data on climate, topography, soil characteristic, irrigation condition, f ertilizer application, and special socioeconomic activities has been developed a nd used for the evaluation of land productivity for different crops by integrati ng with a crop growth model-the erosion productivity impact calculator (EPIC). International food policy simulation model (IFPSIM) is also embedded into GIS fo r the predictions of how crop demands and crop market prices will change under a lternative policy scenarios. An inference engine (IE) including land use choice model is developed to illustrate land use choice behavior based on logit models , which allows to analyze how diversified factors ranging from climate changes, crop price changes to land management changes can affect the distribution of agr icultural land use. A test for integrated simulation is taken in each 0.1° by 0.1° grid cell to predict the change of agricultural land use types at globa l level. Global land use changes are simulated from 1992 to 2050.

关键词：地籍测量 GIS 空间变化数据库土地利用决策支持系统

Interaction Dynamics in AEC Global Teamwork

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Tsinghua Science and Technology 2008年第S1期13卷 145-150页

作者： Renate Fruchter Shubashri Swaminathan Naohiro matsumura Yukio Ohsawa Department of Civil and Environmental Engineering Stanford University Graduate School of Economics Osaka University Faculty of Engineering The University of Tokyo

Architecture, engineering, and construction (AEC) global project teamwork is communication intensive and relies heavily on synchronous and asynchronous information and collaboration technologies (ICT). We explore in this paper how an asynchronous ICT, called ThinkTank, reshaped the work practice of design-construction global teams, and how the interaction with this ICT reshaped the purpose and benefits of its use. ThinkTank is a web-based asynchronous collaboration and discussion forum. We introduce the influence diffusion model (IDM) that formalizes the process of identifying the influence of people, messages, and terms mathematically. Discovering who the influence leaders in project teams are can be beneficial and critical from a corporate management perspective, since they can guide or motivate the team towards successful actions and outcomes. We present the ThinkTank-IDM integrated system and its validation with a testbed of 53 AEC global team project archived in ThinkTank over 8 years.

关键词： global teamwork asynchronous collaboration technology interaction dynamics influence leader influence topic