106 0 0 0 OA 超函数の理論

著者
佐藤 幹夫
出版者
一般社団法人 日本数学会
雑誌
数学 (ISSN:0039470X)
巻号頁・発行日
vol.10, no.1, pp.1-27, 1958-12-15 (Released:2008-12-25)
参考文献数
4
被引用文献数
3
著者
松本 良 奥田 義久 蛭田 明宏 戸丸 仁 竹内 瑛一 山王 梨紗 鈴木 麻希 土永 和博 石田 泰士 石崎 理 武内 里香 小松原 純子 Antonio Fernando FREIRE 町山 栄章 青山 千春 上嶋 正人 弘松 峰男 Glen SNYDER 沼波 秀樹 佐藤 幹夫 的場 保望 中川 洋 角和 善隆 荻原 成騎 柳川 勝則 砂村 倫成 後藤 忠則 廬 海龍 小林 武志
出版者
公益社団法人 東京地学協会
雑誌
地学雑誌 (ISSN:0022135X)
巻号頁・発行日
vol.118, no.1, pp.43-71, 2009-02-25 (Released:2010-04-05)
参考文献数
46
被引用文献数
65 59

A number of extensive methane plumes and active methane seeps associated with large blocks of methane hydrates exposed on the seafloor strongly indicate extremely high methane flux and large accumulations of methane hydrate in shallow sediments of the Umitaka spur and Joetsu knoll of the Joetsu basin 30 km off Joetsu city, Niigata Prefecture. Crater-like depressions, incised valleys, and large but inactive pockmarks also indicate methane activities over the spur and knoll. These features imply strong expulsions of methane gas or methane-bearing fluids, and perhaps lifting and floating-up of large volumes of methane hydrate to the sea surface. High heat flow, ∼100 mK/m, deposition of organic-rich strata, ∼1.0 to 1.5%TOC, and Pliocene-Quaternary inversion-tectonics along the eastern margin of the Japan Sea facilitate thermal maturation of organic matters, and generation and migration of light-hydrocarbons through fault conduits, and accumulation of large volumes of methane as methane hydrate in shallow sediments. Microbial methane generation has also contributed to reinforcing the methane flux of the Joetsu basin. Regional methane flux as observed by the depth of the sulfate-methane interface (SMI) is significantly high, < 1 m to 3 m, when compared to classic gas hydrate fields of Blake Ridge, 15 to 20 m, and Nankai trough, 3 to 15 m. δ13C of methane hydrate and seep gases are mostly within -30 to -50‰, the range of thermogenic methane, while dissolved methane of the interstitial waters a few kilometers away from seep sites are predominated by microbial with δ13C of -50 to -100‰. Seismic profiles have revealed fault-related, well-developed gas chimney structures, 0.2 to 3.5 km in diameter, on the spur and knoll. The structures are essential for conveying methane from deep-seated sources to shallow depths as well as for accumulating methane hydrate (gas chimney type deposits). The depth of BSR, which represents the base of gas hydrate stability (BGHS), on the spur and knoll is generally 0.20 to 0.23 seconds in two-way-travel time, whereas the BSRs in gas chimneys occur at 0.14 to 0.18 seconds, exhibiting a sharp pull-up structure. The apparent shallow BGHS is due to the accumulation of large volumes of high-velocity methane hydrate in gas chimneys. The depth to BGHS is estimated to be 115 m on an experimentally determined stability diagram, based on an observed thermal gradient of 100 mK/m. Then the velocity of the sediments on the Umitaka spur is calculated to be 1000 m/s, which is anomalously low compared to normal pelagic mud of 1600-1700 m/s. This exciting finding leads to the important implication that sediments of the Umitaka spur contain significant amounts of free gas, although the sediments are well within the stability field of methane hydrate. The reasons for the existence of free gas in the methane hydrate stability field are not fully explained, but we propose the following possible mechanisms for the unusual co-existence of methane hydrate and free-gas in clay-silt of the spur. (i) High salinity effect of residual waters, (ii) degassing from ascending fluids, (iii) bound water effect and deficiency of free-waters, and (iv) micro-pore effect of porous media. All of these processes relate to the development of gas hydrate deposits of the Umitaka spur.(View PDF for the rest of the abstract.)
著者
瀬間 徹 佐藤 幹夫
出版者
一般社団法人 日本エネルギー学会
雑誌
燃料協会誌 (ISSN:03693775)
巻号頁・発行日
vol.67, no.8, pp.693-702, 1988-08-20 (Released:2010-06-28)
参考文献数
32

NH3 gas which is injected into flue gas, decompose NOx selectively in non-catalytic conditions under the presence of oxygen and high temperature (900°C-1100°C).This. report describes experimental results about the effects of NH3 gas injection conditions on NOR decomposition process by using the combustion test facility. Main results are as follows.(1) There was an optimum temperature in noncatalytic NOx removal process by NH3 gas injection and it's temperature was about 1050°C.(2) The optimum temperature which gave maximum NOR removal efficiency decreased linearly by the injection of H2 mixed with NH3 gas.(3) NOR removal efficiency increased with increasing of NH3 gas injection ratio, however if NH3/NOx mole ratio was over 2, non reacted NH3 was detected in flue gas.(4) In order to decrease non reacted NH3 and to get high NOR removal efficiency, we recommend NH3 gas injection conditions in which gas temperature at the point of NH3 injection is higher 50°C-60°C than the optimum temperature and NH3/NOR mole ratio is 3-5.(5) In the application of this method to flue gas contained very high NOR concentration, multi stage NH3 gas injection method will be effective.
著者
佐藤 幹夫
出版者
Japanese Society of Farm Work Research
雑誌
農作業研究 (ISSN:03891763)
巻号頁・発行日
vol.1969, no.7, pp.86-90, 1969-03-25 (Released:2010-02-09)
参考文献数
5
著者
塩田 徹 森尻 強 佐藤 幹夫 Toru Shioda Tsuyoshi Morijiri Mikio Satoh 作新学院大学総合政策学部 東京家政大学 東洋大学
出版者
作新学院大学
雑誌
作新学院大学紀要 = Bulletin of Sakushin Gakuin University (ISSN:09171800)
巻号頁・発行日
vol.17, pp.91-103, 2007-03-01
被引用文献数
2

女子大学生105名を対象に,正しい姿勢をとるための意識,およびそのように意識した時の姿勢変化の関係,姿勢と自覚症状との関係,さらには姿勢に対する関心や認識を総合的に調査・検討を行った.対象者の姿勢は,良好・そり腰・猫背,さらにそり腰と猫背の両方の条件をみたしているそり腰+猫背の4つに分類した.良い姿勢をとろうとしたときの意識,自覚症状,ハイヒールを履く頻度をアンケートにより調査した.得られた結果を以下にまとめた.(1)平常時の姿勢において良好者が少なく,早急な対策が必要である.(2)頭部が著しく前方に移動している姿勢の割合が高かった.頚椎も一緒に対策を講じる必要がある.(3)良い姿勢を意識することで,猫背は解消されるが,そり腰が増加し,結局良好は増えない.胸部と腰部の湾曲も適正になるような,矯正のための言葉を考えることが大切であろう.(4)平常時姿勢ごとの,良い姿勢をとるための意識の差異について検討した.その結果,強く意識することに平常時の姿勢ごとに違いは認められなかった.(5)平常時姿勢が同一で,課題姿勢が異なる群ごとに姿勢矯正の意識の平均値を算出し,差の検定をおこなったが,有意な差を認めることはできなかった.(6)姿勢を矯正するために,集団による一般的な傾向を理解させたのでは難しく,個別に行う必要があることが示唆された.(7)女子大生が自覚症状を訴える率は高率であるものの,今回,姿勢やヒールの高い履物との関係を認めることはできなかった.(8)自分自身の姿勢に対する認識や関心においても,平常時の姿勢ごとに差異を認めることはできなかった.The purpose of this research was an investigation of relation between posture change and consideration of posture correction, relation between posture and subjective symptom, and concern to posture, in 105 female university students. University women's posture was classified into four type (ideal posture, posture that leant back, stoop, and stoop+posture that leant back ). The results obtained are as follows. The student with ideal posture was few in normal circumstances. The ratio of posture where the head remarkably moved forward was high. Ideal posture has not increased because posture that leant back increased though the stoop decreased because it considers the correction of posture. There was no difference in the strong consideration in the posture of four types in normal circumstances. It was suggested to have to do individually to correct posture. There was no relation between frequency in which it put on high-heeled shoes and posture though the rate that the university women appealed for the subjective symptom was high. In recognition and the concern for own posture, the difference of four types posture in normal circumstances was not able to be admitted.
著者
佐藤 幹夫 前川 竜男 奥田 義久
出版者
日本地質学会
雑誌
地質學雜誌 (ISSN:00167630)
巻号頁・発行日
vol.102, no.11, pp.959-971, 1996-11
参考文献数
74
被引用文献数
19