著者
勝見 康平 伊藤 誠 岩田 章裕 鈴村 裕 片岡 洋望 竹島 彰彦 池戸 昌秋 坂 義満 伊藤 龍雄 岸本 明比古 加藤 實 中沢 貴宏 武内 俊彦
出版者
Japan Gastroenterological Endoscopy Society
雑誌
日本消化器内視鏡学会雑誌 (ISSN:03871207)
巻号頁・発行日
vol.35, no.3, pp.457-462, 1993-03-20 (Released:2011-05-09)
参考文献数
20

消化性潰瘍の発生に季節性があるか否かをあきらかにするため,内視鏡的にA1あるいはA2ステージの活動期で発見された胃潰瘍601例,十二指腸潰瘍289例を対象に各月ごとの潰瘍発生数を検討した.1年を連続する3カ月ごとの4群に分けて潰瘍の発生数をみると,胃潰瘍は3~5月群が171例でもっとも多く,以後6~8月群164例,9~11月群139例と漸減して12~2月群は127例ともっとも少ない発生であった(P<0.05).一方,十二指腸潰瘍の発生は1~3月群63例,4~6月群68例,7~9月群61例に対し,10~12月群は97例であきらかに高値を示した(P<0.05).以上の成績より,名古屋地区では消化性潰瘍の発生に季節性がみられ,胃潰瘍は春に,十二指腸潰瘍は秋から初冬にかけて好発することがあきらかとなった.
著者
高橋 勝國 斎藤 敏雄 柳島 淑隆 神谷 祥二 老固 潔一 岩田 章 増井 喜健
出版者
公益社団法人 低温工学・超電導学会
雑誌
低温工学 (ISSN:03892441)
巻号頁・発行日
vol.15, no.2, pp.97-110, 1980-05-25 (Released:2010-02-26)
参考文献数
18
被引用文献数
3

This paper presents the results of a study on the pressure drop and the film boiling heat transfer for a two-phase flow of hydrogen in a horizontal tube.Experiments were made on two types of tube; two pieces of vacuum insulated straight tubes of 4m long, inside diameters of which are 18.4 and 23.9mm, respectively; Anuninsulated tube of 8m long with 90 degree bends at two locations, inside diameter of which is 12.3mm.Experimental conditions were as follows; Flow rate (l/min.); 5 to 50 Vapor quality; 0.01 to 0.90 Pressure (bar); 1.4 to 5.8 Conclusions obtained from the experiments are summarized below.1) The frictional pressure drop of two-phase flow of hydrogen for a straight tube is well related to a modified Lockhart-Martinelli (L-M) curve, that is, L-M pressure ratio parameter, φl multiplied by 0.8, for both adiabatic and diabatic conditions. More than 90% of data fell within the scatter band of ±20% from the modified L-M curve.The pressure drop for a bend was also correlated by using parameters analogically introduced from L-M parameters for a straight tube.2) As for the heat transfer by forced-convection film boiling, the following relationship was established based on the method proposed by Ellerbrock.(Nuf/Nufm)⋅Bo-0.4=9.46Xtt-0.131More than 90% of data obtained were in agreement with the the expression shown above with no more than ±20% error.In this study, it was known that the heat transfer for two-phase flow of nitrogen as well as hydrogen follow Ellerbrock's theory.