力学

Referring to the optical rounded reflector of spherical surface used in a space remote sensor, a kind of flexible structure was designed for regulating thermal deformation. Theoretical analysis was done to its dynamic model and parameter of structure, and simulating analysis was also done to reflector module with technology of the Computer Aided Engineering in order to solve the status of high rigidity of structure and poor thermal stability of thermal dimension.

针对某空间光学遥感器的圆形球面反射镜设计了一温升变形调节柔性结构件，对其力学模型及柔节参数进行了理论分析，并采用计算机辅助工程分析技术对反射镜组件结构进行建模和仿真分析，以解决反射镜在力学环境下满足结构刚度要求，而热环境下面形精度显著超差的状况，使反射镜结构刚度满足力学要求的同时，具有良好的热尺寸稳定性，达到遥感器成像质量要求。

Firstly, factors influencing on the mechanical behavior and mechanical properties simulated and predicted were separately taken as input and output quantities. Secondly, Four-layer neural networks model was established to simulate and predict the mechanical properties and constitutive relationship of syntactic foam plastics by means of back-propagation algorithm.

首先，选取影响材料力学行为的因素和所需模拟、预测的力学性能作为输入、输出量；然后，利用反向传播算法建立了四层神经网络模型，对复合泡沫塑料的力学性能和本构关系进行了模拟和预测。

The four sets of stator bars including those retired from three large generators and the standby bar subjected to Dynamic Mechanical Analysis, Scanning Electron Microscopic and optical microscope observation. It was revealed from DMA that the peak value tan d m of mechanical loss thermogram tan d ~ T shift toward a higher temperature and a lower amplitude, indicating that the amount of movement monomers diminished greatly in the insulation aging process, the tan d 195, increased very slightly with the service time of insulation, showing the degrading of bonding properties at interface, and the presence of more defects in insulation. The observation of SEM and optical microscope showed that more and more voids appears in insulation, and delamination was formed due to development of voids in aging process.

对不同运行年数的线棒进行了 DMA 、 SEM 、光学显微镜等微观分析试验，动态力学分析发现(参见 Hao et al， CEIDP， 2002：404)，力学损耗温度谱 tan d ~ T 的峰值 tan d m 随老化时间向高温、低值方向移动，表明促成环氧发生玻璃化转变的活性侧基或发生局部运动的活性链段减少，分子链的刚性增强；195℃的力学损耗 tan d 195随老化时间有缓慢增大的趋势，表明有更多的能量耗散在界面处，界面的粘合性变差，甚至由于界面粘结不良出现微观缺陷； SEM 和光学显微分析发现(参见 Hao et al-2， IEEE DEI， 2003)，老化后的绝缘气隙增多，随着老化时间气隙不断扩展或相互连通，绝缘逐渐分层。

The technique of tire three-ply nonlinear finite analysis was expounded at first, a mechanics nonlinear finite element equation was developed under the centrifugal force of a rolling tire.

本文首先阐述了轮胎三重非线性有限元力学分析方法，推导了离心力作用下轮胎力学非线性有限元方程，完善了滚动轮胎有限元力学分析理论。

The effect of the steel bar type and the heating temperature on the mechanics performance of steel bar was experimentally investigated.

进行了圆钢、螺纹钢、冷拔和冷轧扭4种钢筋高温下力学性能的试验研究，同时进行了螺纹钢筋高温冷却后力学性能的试验研究，并与室温下钢筋力学性能进行了对比分析。

However,the fractal studies are directed at growth models basis on growth mechanism of plant and model of the form only consider of the appearance of plant,unlinked to Structural Mechanics of trees and conclude three-dimensional coordinates.

本项研究试图通过分形理论为研究树木的力学性质提供空间结构模型，因而分形研究的结果是要构建出有三维坐标的树木力学结构模型，为下一步进行力学性质分析打下基础。2。

According to rate process theory, slip theory of plasticity and principle of virtual work, the micromechanical model of soil creep are set up, the numerical solution of the model is given, the differences and similarilities between frequency distribution function of microplane and clay platelet are discussed and schematic computation flow of the model for fitting the test data of homogeneously stressed anisotropically consoildated clay specimens in an undrained creep test at constant volume are given.

以速率过程理论作为土质学与土力学间的桥梁，根据塑性滑动理论和虚功原理，从微观结构的角度，建立了反映粘性土宏观应力应变关系的微观力学模型，给出了微观力学模型数值解的近似表达式，讨论了微滑面与粘粒和团粒定向频率分布的异同，设计了一个拟合各向异性土不排水蠕变的计算流程。

Secondly,based on the requirement of research and combining autofrettage damage of ultra-high vess-el,the paper briefs basic theory of damage mechanics:compare damage mechanics withfracture mechanics,analyze the damaged forms of ultra-high vessel.

其次，基于研究的需要，结合超高压容器自增强的损伤对损伤力学基本理论进行了简述：损伤力学与断裂力学进行了对比，分析了超高压容器的损伤形式。

9GPa respectively, and those of random short fiber composites are 145MPa and 13. 0GPa respectively. Therefore, the initial mechanical capability of unidirectional long fiber and short fiber composites of CPP/PLLA is able to satisfy the requirement of mechanical capability of internal bone fixation materials for cortical bone, and random short fiber composites of CPP/PLLA for cancellated bone.

因此，CPP/PLLA单向长纤维及单向短纤维复合材料的初始力学性能满足承重骨骨内固定材料的力学性能要求；CPP/PLLA随机短纤维复合材料的初始力学性能满足松质骨骨内固定材料的性能要求。

However, it is not known how orthodontic force influences the function of cementoblast and what is the relationship between the function change of cementoblast with root resorption. So we studied the effect of mechanical stimuli on root resoption by examining the expression OPG and RANKL and exploring the related signal transduction pathway in cementoblast. Methods: Cementoblasts OCCM30 were cultured in DMEM with 10% FBS for 48 hours and starved in DMEM with no FBS for 24 hours, then subjected to mechanical strain by four-point bending system with tension and compression stress at 2000μstrain at 0.5Hz frequency. The flow cytometry was used to examine the cell cycle and proliferation activity after 3h, 6h, 12h, 24h loading respectively. OPG and RANKL mRNA were analysed with real time quantitive RT-PCR after the same loading period as FCM.

本课题利用四点弯曲力学加载系统，采用流式细胞术、实时荧光定量PCR、Western免疫印迹等方法，研究体外培养的成牙骨质细胞株OCCM-30在不同力学环境中增殖活性的变化，以及其表达骨保护素和破骨细胞分化因子的mRNA的变化，探讨应力刺激对成牙骨质细胞表达破骨细胞分化调控蛋白的影响，并通过对应力刺激下成牙骨质细胞分裂原活化蛋白激酶家族中的ERK1/2、P38MAPK活性的变化及其与OPG、RANKL基因表达变化关系的研究，对力学刺激调节破骨细胞分化调控蛋白的相关上游信号转导通路进行初步探讨。

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新