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American Journal of Plant Sciences 2015年第5期6卷 591-601页

作者： yuya Higashi Katsuaki Takechi Hiroyoshi Takano Susumu Takio Graduate School of Science and Technology Kumamoto University Kumamoto Japan Center for Marine Environment Studies Kumamoto University Kumamoto Japan

Superoxide dismutases (SODs) catalyze the dismutation of superoxide and play an important role in reducing oxidative stress in plants. Based on in-gel SOD activity staining, chloroplasts of the moss Physcomitrella patens have two CuZn-SODs as the major SOD isozymes and minor SODs, including a Fe-SOD and two Mn-SODs. To investigate the contribution of chloroplastic SODs to stress tolerance in P. patens, we generated a double mutant lacking chloroplastic CuZn-SOD genes. The mutant did not show any differences in comparison to the wild type based on the growth of protonemata on normal and high-salt media, extractable activities of the other SODs after culture on normal and high-salt media, and inhibition of Fv/Fm under stress conditions (high-salt, high-light, and high-temperature). These results indicate that chloroplastic CuZn-SODs do not play a principal role in oxidative stress tolerance in chloroplasts under the investigated conditions. These findings explain the previously reported unusual response of P. patens to copper deficiency, in which chloroplastic CuZn-SODs are preferentially inactivated but cytosolic CuZn-SODs are unaffected.

关键词： Chloroplast Knockout Mutant Physcomitrella patens Stress Tolerance Superoxide Dismutase

Mannich-Type Reactions of Aldimines and Hetero Diels-Alder Reactions of Aldehydes Catalyzed by Anion-Type Lewis Bases Derived from a Single Molecule

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International Journal of Organic Chemistry 2012年第3期2卷 188-193页

作者： Kaori Ishimaru Daiki Maeda Kaori Ono yuya Tanimura Department of Chemistry National Defense Academy Hashirimizu Yokosuka Japan

Mannich-type reactions of aldimines with silyl enolates and hetero Diels-Alder reactions of aldehydes with Danishef-sky’s diene in the presence of anion catalysts derived from proline were performed to afford the cor... 详细信息

关键词： Anion Catalyst Lewis Base Proline Mannich-Type Reaction Hetero Diels-Alder Reaction

Reinforcing Effect of CFRP Strand Sheets on Steel Members

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Journal of Physical Science and Application 2011年第3期1卷 155-162页

作者： yuya Hidekuma Akira Kobayashi Takeshi Miyashita Masatsugu Nagai Nippon Steel Materials Co. Ltd Composites Company Tokyo Japan Top Runner Incubation Center for Academia-Industry Fusion Nagaoka University of Technology Niigata Japan Department of Civil and Environmental Engineering Nagaoka University of Technology Niigata Japan

The steel structure is corroded by various mechanisms, and thus its performance decreases. As a repairing method of the corroded steel member, a method in which carbon fiber sheets is bonded to the steel member with glue has been studied. In recent years, as more efficient repairing method using FRP materials, the strand sheet bonding which has high mass per unit area has been developed. The purpose of this study is to propose the repairing method for corroded steel member by using the strand sheets. In order to confirm a reinforcing effect, the tensile and flexural tests using steel plates and girders reinforced with strand sheets were performed. Test results showed effectiveness of strand sheets for the reinforcement of the steel members.

关键词： CFRP strand sheet steel corrosion reinforcement.

Visualization of Special Features in “The Tale of Genji” by Text Mining and Correspondence Analysis with Clustering

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Journal of Flow Control, Measurement & Visualization 2014年第1期2卷 1-6页

作者： Hisako Hosoi Takayuki Yamagata yuya Ikarashi Nobuyuki Fujisawa Graduate School of Science and Technology Niigata University Niigata Japan Visualization Research Center Niigata University Niigata Japan

In this paper, visualization of special features in “The Tale of Genji”, which is a typical Japanese classical literature, is studied by text mining the auxiliary verbs and examining the similarity in the sentence style by the correspondence analysis with clustering. The result shows that the text mining error in the number of auxiliary verbs can be as small as 15%. The extracted feature in this study supports the multiple authors of “The Tale of Genji”, which agrees well with the result by Murakami and Imanishi [1]. It is also found that extracted features are robust to the text mining error, which suggests that the classification error is less affected by the text mining error and the possible use of this technique for further statistical study in classical literatures.

关键词： Visualization Scientific Art The Tale of Genji Text Mining Correspondence Analysis Clustering

Modeling and analysis of Hayabusa2 touchdown

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Astrodynamics 2020年第2期4卷 119-135页

作者： Kent Yoshikawa Hirotaka Sawada Shota Kikuchi Naoko Ogawa yuya Mimasu Go Ono Yuto Takei Fuyuto Terui Takanao Saiki Seiji Yasuda Kota Matsushima Tetsuya Masuda Yuichi Tsuda Japan Aerospace Exploration Agency Sagamihara252-5210Japan NEC Corporation Fuchu183-8501Japan

The Hayabusa2 asteroid explorer mission focuses principally on the touchdown and sampling on near-Earth asteroid 162173 ***2 successfully landed on its surface and ejected a projectile for sample collection on February 22,***2 later landed near a crater formed by an impactor and executed the sampling sequence again on July 11,*** a successful mission,a thorough understanding and evaluation of spacecraft dynamics during touchdown were *** most challenging aspect of this study was the modeling of such spacecraft phenomena as the dynamics of landing on a surface with unknown *** particular,a Monte Carlo analysis was used to determine the parameters of the operational design for the final descent and touchdown *** paper discusses the dynamical modeling of the simulation during the touchdown of Hayabusa2.

关键词： contact dynamics resistive force theory(RFT) astrodynamics Hayabusa2 planetary exploration

基于多维小波聚类的空间文本数据情感分布分析

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数据分析与知识发现 2019年第7期3卷 14-22页

作者：李柯佐々木勇和南京大学信息管理学院南京210046 大阪大学大学院情报科学研究科大阪565-0871

【目的】构建基于多维小波聚类的空间文本数据情感分析模型,实现文本情感和空间位置的综合分析。【方法】将Yelp数据集进行整合以构建空间文本数据库,使用基于词典的情感分析方法构建特征向量。提出使用多维小波聚类的混合算法和文本–... 详细信息

【目的】构建基于多维小波聚类的空间文本数据情感分析模型,实现文本情感和空间位置的综合分析。【方法】将Yelp数据集进行整合以构建空间文本数据库,使用基于词典的情感分析方法构建特征向量。提出使用多维小波聚类的混合算法和文本–空间算法两种模型并进行分析。【结果】实验结果验证了使用db2和bior2.2小波基函数的多维小波聚类算法比DBSCAN和K-means算法在空间文本数据挖掘中能识别出更精确的聚类集合,且在十万级至千万级数据聚类中速度最佳。【局限】情感分析部分使用一元语言模型,缺乏对语句层面意义的分析。【结论】本文所提文本–空间算法模型能有效挖掘多维空间文本数据的情感倾向分布;混合算法模型为空间文本数据推荐系统提供了同时计算空间接近性和情感相似性的有效方案。

关键词：空间文本数据情感分布分析小波变换聚类

Dynamics of Radioactive Lead Isotopes in the Environmental Atmosphere with Varying Meteorological Conditions

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Dynamics of Radioactive Lead Isotopes in the Environmental A...

Arsenic and Chlorine Co-Doping to CH3NH3PbI3Perovskite Solar Cells

The Second Asian and Oceanic Congress for Radiation Protection

作者： yuya KOIKE Takeshi IIMOTO Toshiso KOSAKO Radioisotope Center The University of TokyoTokyoJapan 2-11-16 YayoiBunkyo-kuTokyo113-0032Japan School of Engineering The University of TokyoTokyoJapan 2-11-16 YayoiBunkyo-kuTokyo113-0032Japan School of Engineering The University of TokyoTokyoJapan 2-11-16 YayoiBunkyo-kuTokyo113-0032Japan

Atmospheric concentrations of radioactive lead isotopes（210Pb,212Pb and 214Pb）were observed at Kawasaki,*** order to discuss atmospheric behavior of radon-and thoron-progeny,seasonal variations in the atmospheric concentrations of the radioactive lead isotopes were observed *** seasonal variations in the atmospheric 212Pb and 214Pb concentrations at Kawasaki showed a “one-peak” seasonal variation pattern:high concentrations appeared in *** seasonal variation pattern of 210Pb concentration was quite different from those of 212Pb and *** seasonal variations of 210Pb concentration showed the “two-peak” patterns:high concentrations appeared in spring and autumn *** atmospheric 212Pb and 214Pb concentrations varied significantly with meteorological conditions at the observing locality and the neighboring *** trends of the atmospheric concentrations of 212Pb and 214Pb at the present observation site were tabulated along with the wide or local meteorological conditions.

关键词： lead-210 lead-212 lead-214 atmospheric concentration meteorological conditions

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Advances in Materials Physics and Chemistry 2017年第1期7卷 1-10页

作者： Tsuyoshi Hamatani Yasuhiro Shirahata yuya Ohishi Misaki Fukaya Takeo Oku Department of Materials Science The University of Shiga Prefecture Hikone Japan

Arsenic (As) and chlorine (Cl) were co-doped to CH3NH3PbI3 perovskite solar cells, and the photovoltaic properties were investigated. AsI3 and NH4Cl were added to perovskite precursor solution, which were deposited on mesoporous TiO2 by a spin-coating combining an air flow method. Current density-voltage characteristics and incident photon-to-current conversion efficiencies were improved by the co-doping of As and Cl to the perovskite phase, which also indicated an energy gap of 1.57 eV. X-ray diffraction showed suppression of PbI2 formation by the AsI3 addition. The structure analysis by scanning electron microscopy indicated formation of a homogeneous microstructure by adding AsI3 with NH4Cl, which would result in the improvement of the photovoltaic properties.

关键词： Perovskite Arsenic Solar Cell NH4Cl Chlorine

Multi-Detector-Row CT Diagnosis of Adrenal Incidentaloma in Patients with Hepatocellular Carcinoma

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Advances in Computed Tomography 2013年第1期2卷 34-40页

作者： Taisuke Harada Tamotsu Kamishima Satoshi Terae yuya Onodera Hiroki Shirato Department of Diagnostic and Interventional Radiology Hokkaido University Hospital Sapporo City Japan Department of Radiation Medicine Hokkaido University Graduate School of Medicine Sapporo City Japan Department of Radiology Keiyukai Sapporo Hospital Sapporo City Japan Faculty of Health Science Hokkaido University Sapporo City Japan

We investigate the diagnostic reliability of differentiating between lipid-poor adrenal adenomas and metastatic adrenal tumors originating from hepatocellular carcinoma (HCC) using a routine dynamic CT protocol for liver imaging. Eighteen metastatic adrenal tumors originating from HCC and 13 lipid-poor adrenal adenomas were identified. Dynamic CT data were analyzed for CT attenuation of adrenal lesions before and after contrast administration. When a cutoff of 36 HU was set for adrenal lesions at pre-contrast attenuation, the sensitivity and specificity for the diagnosis of metastatic lesions were 94.4%and 92.3%, respectively. Attenuation criteria on pre-contrast CT may help optimize the differentiation between these lesions.

关键词： CT Adrenal Incidentaloma Hepatocellular Carcinoma Lipid-Poor Adrenal Adenomas Metastatic Adrenal Tumors

Influence of Surface Properties Modified with Fine Shot Peening on Scuffing

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Journal of Surface Engineered Materials and Advanced Technology 2018年第3期8卷 58-69页

作者： yuya Omiya Masahiro Fujii Ryo Ochiai Koshi Ishimoto Akihiro Ueda Graduate School of Natural Science and Technology Okayama University Okayama Japan Research Laboratory Machine Elements Department IHI Corporation Yokohama Japan

Recently, gears of high strength, reliability, and surface-damage-resistant under severe service conditions are required to achieve the weight saving and downsizing of a product. For the high-speed condition in particular, it is important to understand the influence of the surface properties on the scuffing resistance. If the effective surface profile to improve the lubrication property was found, the metal surfaces could be obtained with both surface strength and surface lubricity. Herein, the influence of surface properties modified with fine shot peening, which can form the arbitrary surface profile, on the scuffing resistance in the rolling-sliding contact machine element, was investigated. The scuffing test was performed using a two-cylinder rolling contact test machine. In a specific sliding, a faster roller of 60% and a sliding velocity of 1.75 m/s were utilized. The scuffing test results with shot-peened test rollers and those with non-shot-peened test roller were compared. The influence of the surface roughness of the shot-peened test roller was also discussed. We found that the shot-peened roller had a better scuffing resistance compared with the roller without the shot-peening process.

关键词： Contact Element Scuffing Shot Peening Surface Properties Surface Roughness Micro Dimples