体应力

MAIN OUTCOME MEASURES: Some biomechanical characteristics of uncemented and cemented femoral prostheses, such as the distress distribution and initial micromovement at different bone densities, were measured.

主要观察指标：测量生物型和骨水泥型股骨假体在不同股骨密度下的应力分布及初始微动等生物力学特性。

Symptoms of cemented femoral prostheses the same as the uncemented femoral prostheses were present in male patients at 60-70 years and in female patients older than 55 years old.

骨水泥型股骨假体上的整体应力在男性60~70岁年龄段分布相对较均匀，初始微动变化较小；在女性55岁后分布相对较均匀，初始微动变化较小。

RESULTS: Relatively well-distributed whole distress and slight initial micromovement of uncemented femoral prostheses were found in male patients at 30-60 years old and in female patients at 40-55 years old.

结果：生物型股骨假体上的整体应力在男性30~60岁年龄段分布相对较均匀，初始微动变化较小；在女性40~55岁年龄段分布相对较均匀，初始微动变化较小。

The uniphase C with W/≤0.3 can be synthesized without being preheated. When W/ is higher than 0.3, the sample expansion increases with the increase of W content, the reaction between W and C is incomplete, the combustion products consist of W〓C, WC, TiC, C, and unreacted W. Preheating mixtures can accelerate the completion of the reaction among Ti, W, and C. The uniphase C with W/=0.4 can be synthesized by SHS at preheat temperature of 600℃. There are two kinds of powders with size of 2-4μm and size less than 1μm in the combustion products.

通过燃烧前沿激冷淬熄试验及产物形貌特征（燃烧块断面组织和产物多晶聚合体颗粒）分析，创新性地提出了两种体系的自蔓延高温反应机制。1熔化—溶解—析出机制：当燃烧温度较高时，燃烧前沿Ti粉熔化，W和C溶解于熔融Ti里，而后C从熔融里析出。2扩散—固溶机制：当燃烧温度不足以使燃烧前沿Ti粉熔化时，通过C的扩散先形成TiC层，其后C沿着热应力导致的TiC层裂纹继续扩散，与固态Ti核反应生成TiC；同时，C扩散至W颗粒，形成W〓C，而后通过C的继续扩散W〓C转变成WC；与此同时，WC固溶至TiC里，形成C固溶体。

We begin by considering a spherical element in an unstressed body.

现在从考察一无应力物体中的圆球形单元体开始讨论。

In the paper, the significance and the present states of the research on the coupled relationship between the vadose field and the deformation field in fractured rock mass is analysed.

分析了渗流场与裂隙岩体形变场耦合关系的研究意义和现状，建立了裂隙岩体固液两相介质的应力耦合模型，模型中裂隙面的产状可直接采用野外实测数据。

Elongation response curves of the wormlike chain model with anisotropy in an eight chain unit cell.

结果 以上述模型为基础分析了软组织结构的力学性质，得到了各向异性八链体胞模型的应力应变曲线。

Moreover, this paper makes an effort in incorporating theCosserat theory in the VCFEM for the elastic-plastic analysis of heterogeneous materialsbased on the PVP. The chapters are divided as follows: In Chapter 1, the author summarizes the study on the equivalent mechanics properties ofheterogeneous materials (including the development of the universal relationship which isirrelevant to the micro structure, the discussion of the limitations of the effective moduli, thecomputation of the effective properties of heterogeneous materials with the micromechanicsmethod and the FEM, and the equivalence of the heterogeneous micropolar materials) and thepresentation, the evolution, the corresponding numerical studies of the Cosserat model and itsapplications in engineering.

本文基于参数变分原理，构建了Cosserat体弹塑性有限元分析模型并用于求解应力集中和应变局部化问题；利用Voronoi有限元法提出了适用于非均质材料宏观弹塑性性能计算的参数二次规划算法；进一步将Cosserat模型应用到Voronoi有限元法中，提出了基于Cosserat理论的Voronoi杂交有限元法，并采用参数变分原理进行新模型的分析计算。

The experiment show that the fiber is well cohered with cement, the fiber reinforced cements structure becomes compact and the fibers bridge the crack.

研究表明：纤维与水泥基体粘结良好，纤维材料的存在使得水泥石结构更加致密，纤维跨接在裂缝的两端，起到桥接和传递应力的作用。

Under different combustion pressuring rates of the solid motor, the relations among the convecting combustion flow characteristics, especial the pattern of flame spreading, and the variation of stress intensity factor at the crack tip are discussed in detail.

文中详细描述了在固体火箭发动机燃烧室环境中，药柱裂纹对流燃烧流场特性和固相裂纹体变形特性；燃烧室增压率对裂纹中火焰传播方式的影响；燃烧室增压率、燃烧室平衡压力的设计值、药柱裂纹径向长度对固相裂纹尖端应力强度因子、燃烧室压力的影响。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。