In this paper , we take high molecule physics and the damage theory of rheologic material with lacuna as the basic , make the experiment as a mostly measure , take the pmma as a research object , to study the pmma ' s nonlinear viscoelasticity of high polymer . the technique showing minute details in minute view measure is used by the author to observe the change of crazing damage density follow the change of stress , time and temperature in term of creep and flab 本文以高分子物理学、含缺陷流变性物体的材料破坏理论为基础，以实验为手段，以工程中常用的pmma为研究对象，对pmma银纹破坏的非线性力学行为进行了研究。作者采用显微技术，对pmma在蠕变或松弛条件下，不同应力水平和不同基温下的pmma银纹损伤进行了实验研究。
In ovx rats , not only bone mineral density ( bmd ) of lumbar vertebrae in vivo and vitro , but also bmd of femora ( except for r3 region ) and proximal metaphysis ( r1 region ) in vitro decreased obviously ( p < 0 . 01 ) ， whose bone loss rates of l5 and l6 were the highest and achieved 13 % ; the trabeculae of ovx rats were few ， fine , and discontinued and there were lacunae on the surface ; in ovx rats , both compressive strength of vertebral bodies and the mechanical properties of femora decreased ; the falling degree of the former was greater ; the maximal compressive power of lumbar vertebrae decreased with 33 . 32 % 结果显示：大鼠卵巢切除后，活体、离体腰椎以及股骨（除r3区） 、胫骨近端干骺端（ r1区）的离体骨密度显著下降（ p < 0 . 01 ） ，离体l5和l6的骨丢失率最大，达13 % ；骨小梁减少、变细，连接中断，骨小梁表面有吸收陷窝；腰椎压缩强度和股骨力学性能均下降，前者更明显，腰椎最大压缩力下降率达33 . 32 % 。
一 、 the reason for my topic i researched the lacuna of study based on classifying and settling literature by consulting a great deal of data . so we can learn that the issue of measurement of human resource is the core of human resource accounting ` s development . from 1960s until now , scholars home and broad made a mass of researches about this issue , established much measure theory and measure model , and investigated the possibility of applying human resource accounting 本文首先介绍了现阶段人力资源会计的理论研究成果及存在的主要问题,具体设计了勘查设计企业人力资源成本会计制度,对人力资源会计价值计量模型的现实选择,简单介绍了劳动者权益会计模型,并将上述理论及模型在吉林省城乡规划设计研究院中进行了模拟应用,从中发现问题,分析问题,解决问题。
