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In this thesis, the crystal structure and phase transition behaviors of a andβforsterite (Mg2SiO4) at high temperature and high pressure were investigated by the first principle calculations and the quasi-harmonic Debye model. Variations of elastic properties, band structure, density of state, band gap ofαandβforsterite with pressure were calculated, and the effect ofα/βphase transition on these characters was analyzed. The effects of water on elastic modulus, sound velocity and band gap of forsterite were also simulated. Finally, the effect ofα/βphase transition and water on seismic discontinuity in earth was discussed.

通过第一性原理结合准简谐德拜模型研究了α和β镁橄榄石的高温高压结构及相变特征；计算了α和β镁橄榄石的弹性模量、波速、电子带结构、带隙等随压力的变化规律，并探讨了相变对这些性质的影响；研究了水对α镁橄榄石弹性模量、波速和带隙的影响；探讨了水对地幔中不连续层的作用以及矿物相变对过渡带波速不连续的作用。

The results of numerical analysis show that the elastic modular and the poisson ratio have no effect on two-dimensional bearing capacity, but can affect the ultimate bearing capacity of three-dimensional foundations and control the convergence and precision of finite element calculation; the earth pressure coefficient controls the geostatic stress of foundation, sequentially affects the ultimate bearing capacity of foundations and the convergence of numerical calculation. When calculating the ultimate bearing capacity of undrained saturated foundation, the complete formulation exists shear locking, and reduce formulation exists hourglassing, so the hybrid formulation is suitable to imitate the geomaterial. When the soil obeys nonrelevent flow rule, the yielding function is different from potential function, and the elastic-plastic matrix of soil is asymmetric, so the unsymmetry numerical solver and appropriate finite element mesh is required.

研究结果表明，土体弹性模量和泊松比对二维基础极限承载力没有影响，但是影响着三维矩形基础的极限承载力，控制着ABAQUS数值算法的计算精度与收敛速度；地基土压力系数控制着地基土体中的地应力平衡，从而影响着二维条形基础和三维矩形基础的极限承载力和地基破坏包络面；对于不排水饱和软黏土地基，常规的完全积分单元会造成剪力自锁现象，而减缩积分单元则存在过于柔化的现象，故采用杂交单元来模拟较合适；当土体服从非关联流动法则时，屈服函数与塑性势函数之间存在差异，从而导致土体弹塑性矩阵呈现非对称性，在有限元计算中必须采用非对称数值解法，并且合理地划分单元才能对极限承载力进行准确求解。

The silicon-acrylic latices with core-shell structures were prepared by means of a"two-stage"emulsion copolymerization. The effect of constituents and proportion of core and shell parts on the properties of latex film were investigated, and their applications in water-borne wood coatings and elastic coatings were explored. The results indicate that wood coating and elastic silicon-acrylic coatings with good performance and zero VOC content can be prepared by suitable design of structure of silicon-acrylic latex particles.

通过&两段&乳液聚合的方法合成了具有芯／壳结构的硅丙乳液，研究了芯／壳乳液粒子结构及组成比例对聚合物漆膜性能的影响，并探讨了芯／壳乳液在水性木器涂料及弹性涂料中的应用，结果表明，通过对硅丙乳液粒子的结构设计，可以获得性能优良的零VOC含量的木器涂料和弹性硅丙涂料。

Suction was applied, drawing the Dieulafoy lesion and the surrounding mucosa into the lumen of the ligator,~preloaded elastic band was fired, and the Dieulafoy lesion was ligated by the elastic band.

Dieulafoy病变是引起上消化道大出血的原因之一，近年来随着内镜诊断水平的不断提高，其发病率有明显上升的趋势。

Calculated the elastic energy of deformation for the lunisolar tide-generating potential and the centrifugal potential of the earth rotation; computed the Love number and elastic energy of deformation for Venus; determined the internal structure model and dynamical parameters of the Galilean satellites.

计算了日月引潮力势和自转离心力势引起的地球弹性形变能；计算了金星勒夫数和潮汐摄动的弹性形变能；给出了四颗伽利略卫星的内部分层和密度分布，并根据模型算出了它们的动力学参数和潮汐耗散因子。

The characteristic of the visco-elastic models and the damage models have been analyzed by the SBS modified asphalt mixture monaxial tension tests ,and coupling becomes visco-elastic and damage models in succession.

通过SBS改性沥青混合料的单轴拉伸试验，分析了粘弹性模型与损伤模型的特性，并耦合成粘弹性连续损伤模型；从能量的角度考虑了SBS改性沥青混合料的疲劳损伤特性和损伤效应，并建立了一种与拉伸应变水平相关的疲劳损伤模型。

Secondly, on the basis of elastic-plastic stability analysis, referring to the stability design method of monosymmetric section axially loaded compression members, equivalent slenderness of pin-ended circular steel arch subject to hydrostatic pressure are deduced from the expression of out-of-plane elastic buckling load.

在弹塑性平面外稳定性分析的基础上，借鉴单轴对称截面轴心受压构件的弯扭屈曲设计方法，提出以面外屈曲荷载对应的正则化长细比为参数进行面外稳定性设计的方法。

But, the characteristics of its adhered-elastic fracture in high temperature and brittle fracture in low temperature were discovered during impact load test The impact fracture mechanism of the high-energy nitroamine propellant had been put forward by studying the fracture appearances of impact fracture surface, the expansion of secondary crack and the weakness or failing of mechanical structure combined with the analysis of impact fracture properties and dynamic adhered-elastic properties and structures.

通过研究冲击断裂表界面的断口形貌、二次裂纹的发展、材料的力学结构缺陷或弱点，并结合冲击断裂性能、动态粘弹性能及结构分析，提出了硝胺发射药的冲击断裂破坏机理。

In the buckling question under nonconservation force,a simply example( the dynamic stability question under the uniformly follower forces with small deformation % linear elastic, straight normal.) is considered.The variational equation of braid composite cylindrical shells subjectd to uniformly follower forces is deduced based on the variation principle of quasinatural frequency of elastic nonconservative system self-excited vibration.The calculated formulas of the flutter load and quasinatural frequency of shells are obtained. The program for calculating the flutter load is developed.The numerical example is given and some useful conclusions are obtained.

对非保守力作用下的屈曲问题，具体研究了圆柱壳在比较简单的情况，即小变形、线弹性、直法线假设下在随动力作用下的壳屈曲问题，由拟固有频率变分原理推出了圆柱壳受随从力作用的变分方程，得到了颤振载荷与壳弯曲的固有频率的计算公式，编制了相应的计算机程序，并给出了具体算例，得到了一些有益的结论。

On the yarn quality of ramie fiber/ cotton modified elastic nubby yarn are analysed,and discusses the process measure that processing modified elastic nubby yarn .

结合对FA502型细纱机进行改造，采用瞬时改变中后罗拉速度的装置，通过生产实践和工艺试验，分析了纤维性能、纺纱工艺等因素对苎麻纤维/棉变弹竹节纱质量的影响，探讨了生产变弹竹节纱的工艺措施。

A carrier gas such as nitrogen is directed through line 20 and valve 22 to connect with line 26 and mix with the gas sample.

如氮气之类的载体通过管线20和阀22引入，与管线26相通，与气体样品混合。

But for the most part, knaves and parasites had the command of his fortune

然而支配他的家产的大多是恶棍和寄生虫。