查询词典 elastic wave

The influence of density of concrete,wave speed of specimen and Poisson s Ratio of concrete on early-age elastic modulus of concrete are studied.

利用超声波无损检测方法测定混凝土的早龄期弹性模量，研究了混凝土的密度、通过试件的波速以及混凝土的泊松比三个因素对早龄期弹性模量的影响。

The land-sonar is presented in this paper, which is based on the principle of elastic reflection wave and is a method of geological forecasting in tunnel construction.

作为地震反射法一个变种的陆地声纳法，是一种易掌握、仪器轻便的隧道掌子面前方地质预报的方法，它用锤击震源在隧道掌子面上设排列和测点工作，在预报岩溶、断层及破碎带、岩脉等方面成功地进行了20多个工区的预报，1995年通过了铁道科学院和铁道部鉴定。

The recompression phenomena have been found in the particle velocity histories of alumina specimens while the impact pressure between 7GPa-8GPa. From the point of view of phenomena, the recompression signals in terms of free surface particle velocity occurring in alumina ceramics under shock-loaded were similar to those in glass where failure wave has been widely verified.(4)The modified form for the Hugoniot Elastic Limit was given associated with

得到了A95陶瓷采用Drucker-Prager准则修正公式计算的σHEL值，并与实验得到的σHEL值进行了比较；(5)采用ANSYS/LS-DYNA有限元分析软件对冲击压缩下氧化铝陶瓷动态力学性能进行了模拟分析，数值模拟结果与实验结果吻合较好，数值模拟结果表明JH-2材料模型能够较好地模拟陶瓷的物理力学性能。

In this paper, we calculate the energy band structure of the phononic crystal by making use of the method of plane wave expansion and investigate the influence of crystal structure, the properties of elastic units and the filling and shape of scatterer on the band gaps in an attempt to provide theoretical guidance to the preparation of phononic crystals.

本文利用平面波展开法计算声子晶体的能带结构，研究声子晶体的结构，组元的性质及散射体的填充率、形状对能带结构的影响，力图为制备性能良好的声子晶体提供理论指导。

First, First term formulae are deduced systematically which describe spherical wave propagation in elastic medium.

首先系统地推导了球面波在弹性介质中传播的首项公式。

The ground response to underground explosion is transformed into the problem about propagation and reflection of spherical dilatation wave in elastic half-space.

将地下爆炸的地表响应转化为弹性半空间内球面膨胀波的传播和反射问题。

The transverse wave propagation in carbon nanotubes/polymer composites laminated structures under ultrahigh frequency(about 1THz)was studied based on the multiple-elastic-beam model.

通过多层弹性梁模型研究了碳纳米管/聚合物复合材料层合结构在高频率(1 TH z左右)下的横波传播，分析了碳纳米管的体积分数和手性对其传播的影响。

The rock-crushing process of dynamic impacting load is simplified, By means of elastic mechanics and wave theory, the axial force and shearing force of ro...

建立的破岩力学模型对旋冲钻井的进一步发展具有重要的现实意义。

J Calculate the speed of the wave in the elastic chord.

在有弹性的弦里计算波的速度。

As each source is activated, it generates a wave train that moves downward at a speed determined uniquely by the rock's elastic characteristics.

随着每一个波列源得以被触发，它就产生一个波列，该波列便以一特定速度向下移动，而其下移的速度仅仅取决于岩石的弹性特征。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。