著者
佐倉 統 平石 界 池田 功毅 中西 大輔 横田 晋大 三浦 麻子 小森 政嗣 松村 真宏 林 香里 武田 徹 水島 希
出版者
東京大学
雑誌
基盤研究(A)
巻号頁・発行日
2013-10-21

放射線リスクの認知特性と社会内拡散動態を明らかにし、風評被害や差別の抑制に貢献することが目的である。個人の認知的特性を対象とする行動免疫班の実験は、放射線リスクに対する忌避感情が当初の予想より強固で制御困難であることを明らかにした。放射線リスク関連情報のツイッターでの動態を解明するソーシャルメディア班は、放射線についての否定的感情が強力であり、他の災害リスクと異なる拡散パターンを確認した。抑圧的でないリスク管理の方途を考察する社会実装班は、感染症などの過去の風評被害や差別の事例との比較分析やメディア論的考察をおこなった。研究遂行および成果発表は福島の研究者や生活者と共有することを心がけた。
著者
加藤 和夫 森川 満隆 田上 道弘 山田 眞二 武田 徹
出版者
Japan Society of Powder and Powder Metallurgy
雑誌
粉体および粉末冶金 (ISSN:05328799)
巻号頁・発行日
vol.50, no.12, pp.1057-1061, 2003-12-15
参考文献数
5

In the previous paper, we reported the densification of the bronze matrix was promoted by the diffusion of Cr under solid state sintering at 1030 K. In the present work, effects of V addition on sintering properties and microstructures of the bronze matrix were investigated, and compared with Cr. Mixed powders were prepared from pulverized V powders and atomized 90Cu-10Sn powders, of which particle sizes were 106-150μm and 1-38μm respectively. Compacts pressed at 390 MPa were sintered at 670-1030 K for 0.3-180 ks in H2. V diffuses preferentially into the surface and grain boundary of the bronze powder. With increasing sintering time at 1030 K, pores of matrix decrease rapidly. This indicates that the densification of the bronze is promoted by the diffusion of V as same as the case of Cr. However, some pores are observed on the matrix and the grain size is bigger than the case of Cr after 180ks sintering at 1030 K. From these results, it is assumed the effects of densification by V addition is slightly smaller than Cr.
著者
加藤 和夫 田上 道弘 山田 眞二 武田 徹
出版者
Japan Society of Powder and Powder Metallurgy
雑誌
粉体および粉末冶金 (ISSN:05328799)
巻号頁・発行日
vol.49, no.9, pp.812-817, 2002-09-15
参考文献数
8
被引用文献数
1 1

In order to develop Graphite dispersed sintered bronze bearing material standing in the use of a higher load application, effects of Cr addition on sintering properties and microstructures of the bronze matrix were investigated. Mixed powders were prepared from elemental Cr powders and atomized 90Cu-10Sn powders, of which particle sizes were 106-50μm and 1-38μm, respectively. Compacts pressed at 390 MPa were sintered at 670-1030 K for 0.3-180 ks in H<SUB>2</SUB>. With increasing sintering time at 1030 K, pores decrease rapidly with the refinement of grain size in the bronze matrix surrounding Cr particle. This indicates that the densification of the bronze is promoted by the diffusion of Cr.
著者
武田 徹
出版者
日経BP社
雑誌
日経ビジネス (ISSN:00290491)
巻号頁・発行日
no.1588, pp.80-83, 2011-04-25

東日本大震災が起きたのは、成田国際空港からトルコ航空機で離陸したわずか27分後のことだった。事態を知ったのは、イスタンブールに到着してからだった。以来、ホテルではネット情報を追い、テレビで映像を見続けた。衝撃を受けたのは、福島第1原発1号機の水素爆発だ。日本の安全安心が吹き飛んだ 原子炉建屋が吹き飛ぶ様子を見ることになるとはーー。
著者
澤木 幸子 蔡 〓 吉田 行輝 武田 徹 猪俣 公宏 小山 哲 石倉 忠夫
出版者
中京大学
雑誌
中京大学体育学論叢 (ISSN:02887339)
巻号頁・発行日
vol.38, no.1, pp.53-58, 1996-10-31

The purpose of this study was to investigate the influence of an assisting mark, The a cross (a vertical line and a horizon line), which was put on the target to stabilize aiming in archery. Subjects in this study were nine male and one female university archers. They were required to aim at the center of the target for 5 sec. as in archery competition. Dependent valuables were frequency, angle of eye movement and eye fixation time. This study assumed that the presense of a cross on the target makes it easier to aim than under normal conditions. Hypotheses were as follows : (1) Frequency of eye movement for the cross condition is less than that for normal condition in aiming. (2) Eye fixation time for the cross condition is longer than that for normal condition in aiming. (3) Angle of eye movement on cross line condition is smaller than that for normal condition in aiming. The results of analysis indicated that the three hypothesizes were supported and that subjects focused attention on the center of the target when the cross was present on the target.
著者
鰐川 周治 武田 徹
出版者
Japan Society of Powder and Powder Metallurgy
雑誌
粉体および粉末冶金 (ISSN:05328799)
巻号頁・発行日
vol.39, no.12, pp.1145-1150, 1992

By using the planetary, screw disc and vibration type ball mills, mechanically activated states of Ti-C powders formed in milling were investigated with the change of their reaction temperature. The temperature decreased with increasing milling time, and its relation is characteristic of the milling methods. Especially, in case of the vibration mill, there is clear indication that the reaction temperature of milled powder was saturated at a constant value as the lapse of the milling time, and also the size of balls charged in mill influenced markedly to the reaction temperature.
著者
堀 拳輔 董 居忠 岡本 啓公 関 将志 村石 浩 齊藤 典生 Thet Thet LWIN 原 秀剛 渡辺 宝 橋本 雄幸 王 波 武田 徹
出版者
公益社団法人 日本生体医工学会
雑誌
生体医工学 (ISSN:1347443X)
巻号頁・発行日
vol.56, no.1, pp.16-21, 2018-02-10 (Released:2018-06-15)
参考文献数
12

Lung cancer is one of the most important diseases to overcome, and chest radiography and low-dose computed tomography (CT) have been used for lung cancer screening. In chest radiographs, nodules overlying the ribs and mediastinum are occasionally difficult to detect. Therefore, CT is used as the gold standard modality to diagnose lung cancer, despite the high radiation exposure it entails. Recently, tomosynthesis has been used to detect pulmonary nodules, but mechanical scanning and a long data acquisition time (approximately 10 seconds) are required to obtain the image. Under this circumstance, tomosynthesis using a small number of projections has been anticipated to allow omission of the mechanical system and shortening of the exposure time. A chest phantom with artificial pulmonary nodules of various sizes was imaged in rotating 360-degree projections. Tomosynthesis images were reconstructed using back projection (BP) from ±32-degrees projection data, and the projection numbers were set at 4, 6, 8, 16, 32 and 64. The images were evaluated visually and quantitatively by measuring the contrast noise ratio (CNR) and artifact spread function (ASF). Tomosynthesis images reconstructed from 4 projection images allowed visualization of an artificial nodule 10mm in diameter without overlapping the ribs or the mediastinum. The CNR of a 4-projection image normalized to that of a 64-projection image was approximately 0.34, and the ASF obtained indicated that fewer number of projections was associated with greater z-axis resolution. Thus, 4-projection tomosynthesis allows visualization of pulmonary nodules 10mm or larger in diameter, and image quality appears to be useful.
著者
武田 徹
出版者
近畿大学
雑誌
奨励研究(A)
巻号頁・発行日
1997

本研究は、葉緑体のモデル型とされるラン藻synechococcusPCC7942のカタラーゼ-ベルオキシダーゼ遺伝子をタバコ葉緑体に導入し、最終的に活性酸素に起因する環境ストレスに耐性を有する植物の作出を目的としている。今年度得られた結果は以下に記すとおりである。1. すでに当研究室で確立されているタバコ葉緑体への遺伝子導入法を用いて、まず、トマトリブロース-1,5-ビスリン酸カルボキシラーゼスモールサブユニットのプロモーターおよびトランジットペプチドの下流にSynechococcusPCC7942のカタラーゼ-ペルオキシダーゼ遺伝子(katG)を連結したプラスミドを構築した。2. 上記のプラスミドをAgrobacterium tumefacienceLBA4404を用いてリーフディスク法によりタバコ(Nicotiana tabacum cv.Xanllthi)に形質転換した。3. カルス化および再分化した後、植物体にまで生育したタバコとして6検体得られた。これら6検体のうち、サザンハイプリダイゼーション、ノーザンハイブリダイゼーションおよびPCRによりキメラ遺伝子の導入が確認されたのは2検体であった。4. 上記2検体の形質転換タバコのカタラーゼ活性はコントロールタバコ(野生株)に比べて1.4-2.3倍であった。また、Synechococcus PCC7942のカタラーゼ-ペルオキシダーゼに対するポリクローナル抗体を用いたウエスタンブロッティングより、これら2検体の形質転換タバコにカタラーゼ-ペルオキシダーゼタンパク質が発現していることが明きらかになった。5. 上記2検体の形質転換タバコのリーフディスクを用いてパラコート耐性実験を行った。その結果、形質転換体は野生株に比べて明らかにパラコートに対して耐性であることが明らかになった。現在、上記2検体の当代(To)の植物体を自家受粉させT1世代を作製中である。
著者
武田 徹
出版者
恵泉女学園大学
雑誌
恵泉女学園大学紀要 (ISSN:09159584)
巻号頁・発行日
vol.19, pp.91-108, 2007-03

This article discusses how the idea of publicness has changed in the history of broadcasting in Japan. The Three Radio Wave Laws established in 1950 (Dempa Sampo): including the law defining the principle for regulation of broadcasting (Hoso Ho), the law regulating the use of radio waves (Dempa Ho) and the law establishing a commission to supervise its usage (Dempa Kanri Iinkai Setti Ho) were intended to terminate the government.controlled broadcasting system dictated under the war government, and to build a new public broadcasting system independent from any kind of governmental control. But, soon after the San Francisco Peace Treaty in 1951, the commission to supervise radio wave usage disappeared, and the decision.making capacity to allot the frequency waves moved back to the Ministry of Post and Telecommunications . This meant that the independence of the broadcasting system also disappeared, because the government regained its ability to rule the broadcasting system again by controlling the licensing of radio waves. In additon, recently, as the Internet has been covering our society, the citizen's `right to know' is fulfilled not only by mass.broadcasting, but also by search engines like Google. How should the broadcasting system maintain its position to be `public' under such circumstances ? This article discusses the possibilities of broadcasting to remain a `public' system by referring to John Rawls' "A Theory of Justice" and the idea of `liberal irony' by Richard Rorty.