Swelling Pressure for Water-Swelling Materials

In the civil engineering field, water-swelling materials are often used as joint sealing materials to improve water cut-off performance in the joints of the steel (pipe) sheet pile. In short, water-swelling materials are extremely effective as water sealing materials. However, many characteristics of water-swelling materials have not yet been proved, and one of the unproven characteristics is the swelling pressure. Solving the issue of the swelling pressure will contribute to improving water sealing in the joints of the steel (pipe) sheet pile. At the same time, it is also expected to greatly contribute to the application of water-swelling materials for other purposes, or the new development and improvement of water-swelling materials. The purpose of this paper is to prove the characteristics of swelling pressure of water-swelling materials which are applied to joint sealing materials, e.g., a steel (pipe) sheet pile, etc., and to experimentally evaluate the swelling pressure of water-swelling materials. The results we obtained are : (1) the swelling pressure depends on the membrane thickness of the water-swelling materials. The thicker a membrane becomes, the bigger the pressure tends to be. (2) While the swelling pressure is not much influenced by the temperature of the water to be immersed, it is influenced by the quality of water to be immersed. Similar to the traits of the swelling rate, the swelling pressure when immersed in artificial sea water is lower compared with that when immersed in freshwater. (3) For example, water-swelling materials 1 mm thick achieve a swelling pressure of 6.7MPa when immersed in fresh water, and 4.2MPa when immersed in artificial sea water, respectively. Accordingly, we assume they should fully perform the swelling functions under a restricted environment as well

Application of Lingual Arch for Functional Class III Malocclusion

This paper is a case report of functional Class III malocclusion treated by lingual arch appliance and edgewise appliance. Characteristics of this malocclusion are as follows; 1) lingual inclination of upperincisors 2) normal or slight lingual inclination of lower incisors 3) anterior displacement of mandible. The objectives of teatment at the first stage are to correct anterior cross bite and to guide favorable jaw growth. Lingual arch appliance can flare upper inceisors easier than labial arch appliance such as edgewise appliance and also is invisible. Lingual arch appliance is an ideal tool for functional Class III cases with Angle Class II molar relation at centric occlusion, because this appliance can move the upper first molar distally as a favorable side effect of flaring the upper incisosrs

傍脊柱筋内に生じ，悪性腫瘍との鑑別を要した 小児骨化性筋炎の一例

症例は生来健康な9 歳男児．誘因なく発症した背部痛にて受診した．画像検査にて脊柱起立筋内の腫瘤性病変を認め，組織学的検査で骨化性筋炎の診断となった．骨化性筋炎は，その発症初期の画像所見から悪性疾患との鑑別が困難となることがある．本症例においては，発症初期の画像検査で悪性疾患の否定ができず，組織学的検査を行った．体幹部脊柱起立筋の骨化性筋炎では側弯症の合併が報告されているが，本症例は経過観察のみで自然軽快が得られ，側彎症などの合併症や運動障害を残さず経過した．体幹部，特に傍脊柱起立筋内に発症した骨化性筋炎は稀であり，背部の腫瘤性疾患で悪性疾患との鑑別が困難である場合，早期の組織学的検査をためらうべきではないと考える

アーカイブス・ニューズレター No.6 2007年3月

●メッセージ大学共同利用機関におけるアーカイブズ●アーカイブズ研究ノート・地主・温泉・佐久間象山・伊豆韮山江川家文書の資料群構造の特質・北朝鮮に残された日本資料米国立公文書館所蔵”Captured Korean Documents”から見る戦後東アジア・「阿波国蜂須賀家文書」幕末・明治期史料の公開●アーカイブズ研究批評書評　国際アーカイブズ評議会建築記録部会編、安澤秀一訳『建築記録アーカイブズ管理入門