半刚性的

Based on the Biot s two-phase theory for fluid-saturated porous media, considering the inertia force of the solid and the liquid, and the coupling function between the solid and the liquid, and the compressibility of the liquid in allusion to the character of the nearly saturated soils. The dynamic governing differential equations are solved by Hankel transform. Then, considering the boundary condition, the dual integral equations of vertical vibration are established which are reduced to Fredholm integral equation of the second kind.

本文基于Biot两相介质动力固结理论，针对准饱和土地基的特点，考虑了流体的可压缩性，土体和流体的惯性及水土之间的耦合作用，运用Hankel变换技术求解动力控制方程，然后按混合边值条件建立起对偶积分方程，并将其化为易于数值计算的第二类Fredholm积分方程，分别研究了准饱和土半空间地基、上覆单相弹性层的准饱和土地基和准饱和粘弹性地基上刚性基础的竖向振动特性。

As one of classical examples of semiactive control system, variable dampers are widely used for structural control.

作为半主动控制系统的经典范例之一，变阻尼控制系统已经在结构控制领域得到了广泛的应用，但是近来的研究显示变阻尼控制对于抑制柔性结构的地震反应是适宜的，而对于刚性结构则是不适宜的。

When an elastic substrate in half-plane was subject to indentations by a rigid, flat-ended punch, a singular stress field and K-dominant region should arise adjacent to the punch edges. When the intensification of such singular stress fields reaches its critical value, fracture will take place on the surface of the contact boundary.

由于周期阵列刚性压头压在半平面弹性体的表面时，会产生周期的Ⅰ型奇异压应力场，该奇异应力场的应力集中达到一定程度时，即达到临界条件时，该奇异应力场所在的边界将开裂。

Chrysanthemum of 10 thousand birthday is lax to edaphic requirement, with the arenaceous qualitative loam with fecund, good drainage had better.

万寿菊对土壤要求不严，以肥沃。排水良好的砂质壤土为好。

He unstepped the mast and furled the sail and tied it.

他拔下桅杆，把帆卷起，系住。