波力

In this paper an algorithm of finite element modelling is discussed for elastic wave propagating in two dimensional media. Two analytical formulas of the initial motion and wave form of P wave are derived in time domain for a point force source directing vertically down as a function of time with a bell shape.

本文讨论了二维介质中弹性波有限元模拟的一种方法；导出了二维无界空间中集中力点源的理论初动表达式和位移波形表达式，并和相似情况下的有限元结果进行了比较；对用有限元方法算得的几个中小模型的节点位移进行了分析。

In this paper, the elastic wave propagation in a two-dimensional piezoelectric phononic crystal is studied by considering the mechanic–electric coupling.

本文考虑力电耦合效应，研究了弹性波在二维压电声子晶体中的传播特性。

Although he did not begin writing until he was forty-nine, his works, edited posthumously by his student Porphyry into fifty-four books called the enneads , covered every major branch of philosophy except politics.

尽管普诺提诺在49岁以前并没有从事写作，但他的学生菲力波里在其死后，把他的作品编撰了一套54册的集子，叫做《九歌》，涵盖了哲学的每一个重要分枝，但不谈政治。

Cagliari created an opening early in the second half when Massimo Gobbi's low effort was deflected wide of the goal by Mauro Esposito while at the other end, Andrea Pirlo just missed the target with a curling effort.

卡利亚里下半场伊始突然发力，戈比的低射打在埃斯波西托身上弹出了门外；而在球场的另一边，皮尔洛的弧线球射门也是险险从球门旁擦过。

Field observations showed that there are two major causes to shield tunnel during ground shaking: earthquake wave propagation and differential subsidence due to earthquake.

一是盾构法隧道结构在地震行波作用下的动力响应分析与抗震设计，二是盾构法隧道在不均匀震陷下的纵向受力研究与抗震设计。

The results showed that their initial low burning rate characteristics have obvious effect on controlling the pressure waves strength in gun chamber, and can greatly improve the interior ballistic adaptability under pressure endurance environments.

高能硝胺发射药起始缓燃特性具有抑制膛内压力波强度作用，可大大改善其在火炮膛内的受力环境及其应用中的内弹道适应性，对使用安全性都是有利的。

The ANSYS/LS-DYNA software was used to simulate the stress wave pattern and the pulse width in the process, as the hammers had different masses and the radius of impact head and its elastic modulus had different impact velocities, and the prestressed bolt was excited by hammers with different masses and different hardnesses in laboratory.

然后运用ANSYS/LS-DYNA软件模拟了不同质量、撞击头半径和弹性模量的撞击杆以不同的速度撞击长杆的应力波形态和脉冲宽度，并在实验室对预应力锚杆用不同质量、不同硬度的力锤进行了激振试验。

Home position shear tests of slope rock, point loading tests and indoor AMD simulation action tests in XingQiao concave slope had show shearing strength and coherence between body layers of quartz sandstone decrease by 13.2%~21.3% after attacked by AMD, the angle of internal friction between layers is decreased by 5.0%~7.5%, in general, AMD affects the rocks mechanical property at range of 60~100m interior the perpendicular slop. Data analysis shows: 1 The actions to slope are major focused on zone of weakness, shearing strength of slope foot and AMD centre are reduced by 52% and 64.7% separately. 2 The explosion stress wave of long distance field has obviously increasing influence to disturbance amplitude value of slope with increasing of the slope height and distance, the response of the top of slope and fault region are obvious as well as damage effect; the foot of slope is with smallest disturbance amplitude value, the disturbance amplitude value of the step close to free face is obviously bigger than the interior of slope. 3 With the coupling effect of the AMD and explosion loading, the stress distribution inside of slope mainly presents characters of explosion stress field; the area affected by AMD becomes a weak area of shearing stress.

新桥深凹露天矿边坡岩体的原位剪切试验、点载荷试验、室内模拟AMD作用试验表明：AMD蚀化后的石英砂岩，岩体层面间的抗剪强度和粘聚力减小的幅值约为13.2%~21.3%；层面间内摩擦角减小幅值在5.0%~7.5%之间；AMD一般影响垂直边坡体内部在60~100m范围内的岩体力学性质数值分析表明：AMD对边坡体的作用主要集中在弱化区域内，边坡体的底脚和AMD作用中心区域的剪切应力减少了52.0%和64.7%；(2)随着边坡体高度和距离的增加，远场爆炸应力波对边坡扰动幅值的增加趋势明显，边坡顶部和断层部位的响应突出，损伤效应明显；边坡底脚扰动幅值最小，临空面附近台阶的扰动幅值明显大于边坡体内部；(3)AMD与爆破荷载耦合作用后，边坡体内部的应力分布主要呈现出爆炸应力场的特征，AMD影响区域形成了一个剪切应力弱区。

Born in March 1989 in London, England, Harry Melling was cast as Dudley Dursley in the Harry Potter films.

3月1989年出生于英国伦敦，哈利·米尔林被选饰演哈里波特电影中达力·德斯礼的角色。

In this paper, choosing submerged spheroids and Wigley hulls as computing models, the computed wave resistance and first-order wave exciting force are in good agreement with the other published results.

并将兴波阻力系数、一阶波浪扰动力的计算结果与试验结果和他人的计算结果进行了比较，吻合程度较好。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。