我国蚌科一新纪录

查氏拟齿蚌Pseudodon chaperi (Morgan, 1885) 见壳近似长方形,略膨胀。前部短圆,后背缘呈截状与后缘相交处有一不明显的角。壳顶部低平,略低于后背缘,位于贝壳的前部,距壳前端1/3处。腹缘略直。壳面呈黄褐色或棕褐色,常被腐蚀。

三角帆蚌

三角帆蚌俗称翼蚌、劈蚌、珍珠蚌、三角蚌,是一种淡水双壳类软体动物,属瓣鳃纲、蚌科、帆蚌属。三角帆蚌广泛分布于湖南、湖北、安徽、江苏、浙江、江西等地,尤以洞庭湖及中型湖泊分布较多。1.形态特征。三角帆蚌贝壳大而侧扁,具有向上突起的三角帆状后翼,外形略呈三角形。贝壳最长可达240毫米,壳面呈黄褐色,壳顶外缘有数条由结节突起组成的斜行粗肋,铰合部发达,左右壳各有2枚拟主齿,左壳有2枚侧齿,

Design theory and dynamic mechanical characterization of the deployable composite tube hinge

This paper presents a design theory and dynamic mechanical characterizations of the composite tape-spring hinge made by two parallel single tape springs.First,the theoretical models of moment-rotation angle on anisotropy tape springs with antisymmetric laminates are proposed.Second,the relationships of moment-rotation angle for tape-spring hinges with different sizes are simulated and analyzed by means of the finite element method (FEM),which is in good agreement with the results from theoretical predictions.Finally,the dynamic vibration analysis for deployable composite tube hinges with different dampings is done during the process of deployment.