著者

吉川 文隆 矢野 昭彦 内田 幸宏 藤田 健二 川添 強 佐田 裕之

出版者

The Japan Institute of Marine Engineering

雑誌

Marine engineering : journal of the Japan Institution of Marine Engineering = マリンエンジニアリング : 日本マリンエンジニアリング学会誌 (ISSN:13461427)

巻号頁・発行日

vol.43, no.1, pp.123-129, 2008-03-01

参考文献数

7

被引用文献数

1

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Propeller shaft diameter of ferries becomes larger in conjunction with requirements of higher vessel's speed and CPPs (controllable pitch propellers) . Thus, it may lead into a tendency to reduce the life duration of stem tube bearing under seawater lubrication. Wear of the propeller shaft sleeve, i.e. bronze alloy, is typically greater than that of the rubber bearings, with triangularly shaped craters appearing on the sleeve surface.<BR>In this paper, we describe the investigation of used sleeve sample taken from an actual vessel, as well as the wear characteristics of bronze alloys conducted under the corrosive wear condition which is equivalent to actual ferry service. The results indicated that corrosive wear was the main cause of sleeve wear. Comparing between the amount of wear in seawater and the one in distilled water, the influence of corrosion on sleeve wear was found to be substantial. Additionally, the craters are considered to be formed by the action of erosion corrosion

著者

丹比 邦保 柿原 秀文 高木 実 堀 泰仁 矢野 昭二 安藤 伸生 熊井 清雄

出版者

日本草地学会

雑誌

日本草地学会誌 (ISSN:04475933)

巻号頁・発行日

vol.22, no.2, pp.70-77, 1976-07-25

被引用文献数

1

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本研究は厩肥と尿の施用水準が青刈トウモロコシの化学成分と飼料価値に及ぼす影響を究明する目的で行った。試験区の設定に当たって,A区を対照区,B・C区を試験区とした。対照区は施肥基準に基づき化学肥料を施用し,試験区は厩肥と尿をそれぞれアール当たり5,000kg:2,000kg,15,000kg:6,000kg施用し,前者をB区,後者をC区とした。B区のP_2O_5補足には過石を施用した。青刈トウモロコシ(品種名:ホワイトデントコーン)は播種量10アール当たり10kg,うね幅60cmで6月5〜6日に播種した。なお,本草の刈取りは雄花抽出後から乳熟初期に行った。消化試験には青刈トウモロコシの生草,天日乾草及びサイレージを用い,メン羊に給与した。1.4ヵ年の青刈トウモロコシの10アール当たり乾物重は各処理区とも1973年値が最も高かった。しかし,乾物重についてはどの年も処理間に有意差は認められなかった。2.粗蛋白質含量は窒素施用量の多いC区が最も高く,1972年値はC・A区とB区,他の年次はC区とA・B区との間にそれぞれ有意差(p<.01)が認められた。3.粗灰分含量は経年的に増加が認められた。4.Ca含量は厩肥・尿の施用量の多い区が低かった。5.KとNO_3-N含量は厩肥と尿の施用量の多い区が高かった。前者では各処理区とも経年的増加が認められるとともに,1975年値のC区が高くA区との間に有意差(p<.01)が認められ,後者では1974年値のC・B区が高くA区,1975年値はC区が高くA・B区との間にそれぞれ有意差(p<.05)が認められた。6.Na含量は経年的に各処理区とも低下の傾向を示した。7.P含量は1972年を除いて厩肥・尿施用区が高く,1973年はB区とC・A区,1974・1975年はB・C区とA区との間にそれぞれ有意差(p<.05)が認められた。8.生草・天日乾草及びサイレージの化学成分消化率比較をすると,それぞれの処理間でA区の粗蛋白質消化率が量も低く,生草・天日乾草のB・C区とA区との間に有意差(P<.05)が認められた。9.各処理区のサイレージ品質は評点優であった。10.青刈トウモロコシに厩肥・尿の連続多量施用を行った場合,刈取時期が雄花抽出期以後であれば硝酸中毒の危険は少ないが,経年的にK含量の増大が著しかった。

著者

高安 正夫 菅原 努 矢野 昭 山崎 茂郎 西村 昭正

出版者

一般社団法人 日本内科学会

雑誌

日本内科学会雑誌 (ISSN:00215384)

巻号頁・発行日

vol.44, no.2, pp.77-82, 1955

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The usual leads employed for electrocardiogram and vectorcardiogram have been introduced not for clearcut relationship between the leads and the electromotive forces of the heart, but rather for their clinical easiness or for their so-called unipolarity. Hence the relationship obtained is so complex that there arose many different interpretations about it. Even vectorcardiogram, as Dr. Johnston and Dr. Prof. Maekawa pointed out, is not the true expression of the electromotive vector of the heart but is merely the vectorical representation of the obtained leads.<br>We employed the theory of lead field and lead vector and devised a new method to obtain the curves of the time-course of each of three components perpendicular to each other of the composite electromotive vector in the whole heart. We named it &ldquo;the vectorical lead&rdquo;. The method is as following: We lead between the nape and both feet with small electrodes, between the front and the back, and the right and the left of the chest with the large plate electrodes which cover the whole projections of the heart to each direction. The lead-fields between these electrodes are approximately homogeneous and parallel through the whole heart and hence each of the three spacial components are obtained correctly.<br>Comparing the curves by this method with that of the usual leads, we concluded that a VF lead was the head-to-feet component of the electromotive force of the heart, and that the right-angled isosceles triangle schema by Dr. Prof. Maekawa is more proper to the actual conditions than the equilateral triangle schema by Einthoven. The clinical applications of this method will be discussed in the future papers.

著者

吉川 文隆 内田 幸宏 藤田 健二 矢野 昭彦 川添 強 佐田 裕之

出版者

The Japan Institute of Marine Engineering

雑誌

マリンエンジニアリング (ISSN:13461427)

巻号頁・発行日

vol.43, no.2, pp.258-264, 2008

被引用文献数

1

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The previous report described the corrosive wear on propeller shaft sleeves, made of bronze, in seawater-lubricated stem tube bearings. Accompanying is the occurrence of craters on the sleeve surface due to the action of erosion corrosion. As a countermeasure, based on the mechanism, this second report will provide the development of a catholic protection bearing, what prevents corrosion of the sleeve surface and reduces wear. Using anodes installed in some of the water channel grooves of the rubber bearings, this method is characterized by intermittent protection at best, and protection conditions were investigated by means of fundamental testing and using bearings of 140mm in diameter. As a result, a current density of 8A/m<SUP>2</SUP> was found to protect the sleeve from corrosive wear. Cathodically protected bearings were also applied to bearings of 500mm in diameter and equipped for a ferry vessel. The results are presented here in terms of bearing design, trial running, and successful reduction of wear during actual in-service use.