Impervious wall is thin and deep , so it cannot satisfy the hypothesis of half space . the surface wave theory of impervious wall is analyzed and proves that surface wave speed in impermeable wall is nearly equal with that in plane - strain problem , so the transverse w ave speed getting by rayleigh surface wave exploration technique can satisfy the precision desire of engineering 我们对面波在防渗墙中传播原理进行了分析，证明防渗墙中的面波波速与半空间理论中面波波速差别很小，因此，用瞬态面波检测技术来获得剪切波速可以满足工程精度的要求。
The plating in ships is generally subjected to combined in - plane and lateral pressure loads . in - plane loads include biaxial compression / tension and in - plane bending and edge shear , which are mainly induced by overall hull girder bending and / or torsion of the vessel . lateral pressure loads are due to water pressure and cargo 面内载荷分为轴向压应力或拉应力、边缘剪切应力以及面内轴向弯曲应力。实际的船舶结构中面内载荷通常由船体梁的总纵弯曲或者船体梁的扭转引起。侧向压应力则由水压力和货物压力引起。
Aggregation - process in faffa has been improved by taking the phase affection between triangles and the group center into account . this made the results more accurate . at last , using the accelerated ipo and mom based on fmm into the complex - method , by using this method , the analyses efficiency of the electrically large cavities have been efficiently improved 应用faffa实现了ipo的快速计算,使ipo法分析电大尺寸腔体的能力显著增强,同时本文对faffa的聚集过程进行了改进,考虑了组中面元与组中心之间相位的影响,提高了计算精度。
Abstract : based on the basic concept of the revolving shell , the equation of the middle surface generatrix of the approximate ellipsoid portion of the ellipsoidal head is derived , the unwrapped area and the unwrapped diameter of the ellipsoidal head are calculated , the result is compared with that of derived from the real ellipsoid and that of calculated from the empirical equation , relative chart and code are given out , which could be used by manufactures for reference 文摘:根据回转壳体的基本概念，推导了椭圆封头的近似椭圆壳部分的中面母线方程，据此推导计算了椭圆封头的展开面积及展开圆直径，并根据椭圆壳几何形状推导的结果与经验公式所得结果进行了比较，给出了有关图表及计算程序，可供制造单位参考使用。
Increased productivity in the conveying of empty bobbins , cops or cop trays in fully - automatic linkage systems , on winders and twisters , right up to the intermediate storage and pakaging of cross - wound bobbins . transilon conveying and processing belts often cross the line between a pure conveying function and the " active " participation " in the production process 在络筒机或倍捻机上的全自动运续系统中，速度能提高输送空管、纱管和纱管盘，因而，提高交叉卷绕卷装和中面储存工序生产率。
