著者
各種測定法による硬さの換算法に関する研究委員会
出版者
日本ばね学会
雑誌
ばね論文集 (ISSN:03856917)
巻号頁・発行日
vol.2011, no.56, pp.33-41, 2011-04-28 (Released:2011-11-10)
参考文献数
2

In spring factory, large size springs are manufactured in hot forming process. In many cases, the hardness of hot formed springs is inspected by Brinell hardness test. The quality agreement between customer and manufacturer on hardness is often established by other hardness like Vickers and Rockwell hardness, though the spring hardness quality control in shop floor is done by Brinell hardness. Therefore, hardness conversion is often carried out. SAE-J417 has been used for the hardness conversion in the spring industry for this purpose. However, it is often said that the hardness conversion value is not adequate in the area where the hardness is higher than conventional area. This committee started on investigating the difference between SAE-J417 conversion data and various spring hardness test data on June 2007. The purpose of this committee is to offer the new conversion data between various hardness tests for the spring steel and to establish JSMA standard. As a result of three years activity, following findings were obtained.(1) It has been understood that the correlation in Brinell hardness, Rockwell hardness and Vickers hardness is not necessarily correct in SAE-J417 data as the result of various hardness tests on SUP9 spring steel.(2) The dispersion was ±1.5% in maximum when measuring the hardness by Brinell hardness tester, Rockwell hardness tester and Vickers hardness tester.(3) The dispersion was about one percent as a result of investigating the influence of testing load in Vickers hardness measuring.(4) The correlation between various hardness tests using several grades of spring steel did not show clear difference by steel grades. (So, the committee made a new conversion table for spring steel by treating all the data from different steel grades as data from one grade.)
著者
圧縮コイルばねのへたりに関する研究委員会
出版者
日本ばね学会
雑誌
ばね論文集 (ISSN:03856917)
巻号頁・発行日
vol.2014, no.59, pp.47-62, 2014 (Released:2014-12-01)
参考文献数
27
被引用文献数
2

Height reduction of compressive coil springs (height loss) is considered to be the effect of creep phenomenon. Height loss of coil springs made of SWOSC-V behaves 3 different temperature dependency in elevated temperature zone, namely lower region (100-200℃), mid region (250-300℃), and higher region (350-400℃). These behavior are quite different from much elevated temperature region. In lower region, Cottrell effect seems to be the governing factor of creep speed. On the other hand, IS effect has the governing role in higher region. In mid region, the creep speed is governed by a transition mechanism from Cottrell to IS effect.
著者
機関第三研究委員会
出版者
公益社団法人 日本マリンエンジニアリング学会
雑誌
日本舶用機関学会誌 (ISSN:03883051)
巻号頁・発行日
vol.28, no.12, pp.752-758, 1993-12-01 (Released:2010-05-31)

This paper shows the design manual of main engine lubricating oil sump tank.
著者
田中 昌一郎 粟田 卓也 島田 朗 村尾 敏 丸山 太郎 鴨井 久司 川崎 英二 中西 幸二 永田 正男 藤井 寿美枝 池上 博司 今川 彰久 内潟 安子 大久保 実 大澤 春彦 梶尾 裕 川口 章夫 川畑 由美子 佐藤 譲 清水 一紀 高橋 和眞 牧野 英一 三浦 順之助 花房 俊昭 小林 哲郎 日本糖尿病学会1型糖尿病調査研究委員会
出版者
THE JAPAN DIABETES SOCIETY
雑誌
糖尿病 (ISSN:0021437X)
巻号頁・発行日
vol.54, no.1, pp.65-75, 2011-01-30
参考文献数
19
被引用文献数
2

日本糖尿病学会1型糖尿病調査研究委員会の緩徐進行1型糖尿病分科会(旧日本糖尿病学会緩徐進行1型糖尿病調査委員会)では委員会委員の所属する施設において発症から5年以内の新規受診糖尿病687例を前向き(2004年4月~2009年12月)に登録し膵島関連自己抗体(glutamic acid decarboxylase[GAD]抗体,insulinoma-associated protein 2[IA-2]抗体およびinsulin autoantibodies[IAA])の測定を行った.2型糖尿病と思われる症例で膵島関連自己抗体が一種でも陽性の場合には緩徐進行1型糖尿病:slowly progressive IDDM(以下SPIDDM)と病型区分した.その結果,1)2型糖尿病と思われる症例の10%(49/474, 95%信頼区間:8-13%)にSPIDDMが認められた.2)膵島関連自己抗体陰性の2型糖尿病に比しSPIDDM例の自己免疫性甲状腺疾患の合併頻度,HbA1c値,初診時のインスリン治療の頻度は有意に高く,BMIは有意に低かった.3)SPIDDMではGAD抗体の頻度(69%,34/49)はIA-2抗体の頻度(39%,19/49)やIAA(29%,14/44)の頻度に比し有意に高かった.4)SPIDDMでは急性発症1型糖尿病に比し膵島関連自己抗体の単独陽性例が高頻度だった.以上の結果から2型糖尿病と思われる症例に高頻度にSPIDDM症例が含まれる可能性があること,SPIDDMは2型糖尿病や急性発症1型糖尿病と異なる臨床的特徴を呈することが全国規模調査で明らかとなった.<br>