女子短大生の主観的健康の変化とその要因 : 生活習慣、生活ストレス、ソーシャルサポートとの関係を中心に

The purpose of this study was to clarify influences of lifestyle factors on subjective health changes of female students during 6 months after they entered the college in April 1993. Then, two studies using self-administered questionnaire were conducted. The first study was carried out in April 1993 and the second was done in last October. As for measurements, THI was used as a indicator of subjective health. This indicator was surveyed in both research periods. College life experiences scale (CLES), emotional social support score, health practice index (HPI) and three questions of health habits surveyed in the second study were used as lifestyle factors. To examine the impact of lifestyle factors on changes of subjective health, multiple regression analyses were conducted. THI was a dependent variable and three lifestyle factors stated above were adopted as independent variables. Our study subjects were 207 female college students ; their majors were health sciences. The results were as follows : 1) As for the sub-scale of many subjective symptoms, a significant standardized partial regression coefficient of perceived regularity of daily life (β = 0.23) was found. 2) Two significant standardized partial regression coefficients on the sub-scale of depressiveness were found ; the HPI (β= - 0.18) and emotional social support scale. (β= -0.16) 3) Three significant standardized partial regression coefficients on the sub-scale of irregularity of daily life were found ; those variables were perceived regularity of daily life (β=0.23), HPI(β= -0.17) and emotional social support scale. (β= 0.20

樹幹の振動および固定がハンノキ属 2 種の成長におよぼす影響(林学部門)

落葉広葉樹ハンノキ属の2樹種の若木について, 3とおりの機械的刺激 : 振動, 固定, および自然(対照)を樹幹に与えて, 約1生育期間の成長への影響を調べた。実験結果を要約するとつぎのとおりである。1)振動によって樹高成長は減少, 直径成長は増加し, そしてH/Dは減少した。生枝下部の幹断面積成長は, 振動で下方ほど著しく促進された。しかし樹冠内では振動の影響はあらわれない。固定すると生枝下部で減少し, 樹冠内での増加が著しい。2)処理期間中の年輪成長幅は, 振動方向の増加が樹幹全体であらわれた。この傾向は下方ほど大きい。3)根重および根の割合は振動によって増加した。とくに支持根で著しい傾向があり, しかも振動方向に発達して耐振動性が大きくなった。4)全樹体, 地上部, 幹枝葉の各重量に対する処理の影響はばらばらであったが, 振動で乾物生産が減少することはなかった。幹枝葉のしめる割合は振動によって顕著な変化があらわれない。T/Rはヤシャブシで処理効果がなく, ヤマハンノキの実験では振動自然>固定で各10%差だった。The effects of three mechanical stimulations : shaking, staying, and free-swaying (control), on the growth and development of young alder trees were studied. The period of the treatments was from 72 to 108 days. The summary of the results are as follows. 1) The shaking reduced height growth, enhanced diameter growth, and consequently decreased the ratio of height to diameter. Stem crosssectional area increment on clear bole was markedly increased by shaking, with the increase toward the stem base. The stayed trees showed a pronounced upward shift of increment, at the expense of downward stem parts. 2) Trees responed to unidirectional shaking by producing larger diameter increment along the shaking direction throughout their length, with increasing on the lower stem. 3) The effects of shaking affected growth by altering weight and percentage of roots, especially for larger roots more than 0.2cm in diameter. The root system was reflected by the development in direction to the stem shaking. 4) Although the evident tendency of the effects of the mechanical treatments on the dry weight of stem, branches, leaves, above-ground parts, and a whole tree has not become visible, the shaking did not reduced dry matter production. With the exception of root growth, the shaked and stayed trees did not alter the distribution of dry weight of each organ within the tree. The ratio of above-ground parts to root of a Alnus firma tree was not affected by shaking, but for A. hirsuta var. sibirica, the value resulted in decrease for shaken trees and in increase for stayed. 5) In the stayed treatment where A. hirsuta var. sibirica trees were prevented from swaying throughout their length, the stem bending was observed after the tree stakes were removed. Mean bulk density of stems spaned a range from 0.37g/(cm)^3 for shaking to 0.31g/(cm)^3 for staying

滇西临沧花岗岩基冷却的热年代学分析

为利用热年代学方法重建临沧花岗岩基的冷却历史，测定了6块花岗岩样品的锆石U—Pb年龄、黑云母Rb—Sr等时线年龄、黑云母和钾长石的^40Ar／^39Ar年龄以及锆石和磷灰石的裂变径迹数据。分析表明，自结晶以来，岩基主体经历了较复杂的热演化，在两个基本阶段即早期快速冷却阶段和晚期缓慢冷却阶段上叠加了短周期的热扰动，从中一晚三叠世到旱侏罗世末，冷却速率可以达到6°C～13°C／Ma，中侏罗世冷却缓慢，晚侏罗世到早白垩世早期，岩基快速冷却，平均速率达到5°C／Ma，早白垩世晚期到喜山运动前，为缓慢冷却阶段，平均速率仅为0．5°C／Ma，喜山运动后，受印藏碰撞的影响，岩基经历了两期冷却事件，早期冷却速率为5°C—10°C／Ma，晚期即5Ma以来冷却速率明显增大，特别是近3Ma以来的冷却速率达到16℃-20°C／Ma；早白垩世侵入的岩体（如样品S57），在侵入后快速冷却，晚白垩世以后与岩基主体同步冷却；岩基东侧糜棱岩带不是形成于150Ma，而可能是早期陆陆碰撞造山时推覆冲断的产物；自晚白垩世以来，岩基地区的总剥蚀厚度可达5000m左右，其中印藏碰撞引起的剥蚀可达3500m左右

滇西临沧花岗岩基新生代剥蚀冷却的裂变径迹证据

为揭示临沧花岗岩基的剥蚀冷却历史，探讨印藏碰撞对滇西的影响，对6块临沧花岗岩基样品进行锆石和磷灰石裂变径迹测定，并利用模拟退火法对其中5块样品的磷灰石裂变径迹数据进行非线性热史反演，估算了不同时期的剥蚀量和抬升量．结果表明，岩基自印藏陆陆碰撞以来经历了两期冷却事件，早期冷却速率仅5-10℃／Ma，晚期冷却速率明显增高，特别是近3Ma以来的冷却速率达到16-20℃／Ma；两期总剥蚀厚度可达3300～3500m．分析表明冷却事件与印藏碰撞关系密切，早期冷却是在印藏碰撞影响下，临沧岩基卷入逆冲推覆运动而遭遇抬升、剥蚀的结果；晚期冷却则是上新世以来，特别是3Ma以来岩基经受整体的强烈抬升、剥蚀的结果，该期构造抬升量约为672～1263m；裂变径迹资料还揭示印藏碰撞先影响南部岩体，随后才波及到岩基中北段