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The modal tests of PCB and PCB assembly (free boundary condition and fixed boundary condition) were carried out. The equivalent elastic modulus and damping parameters of PCB can be gained, and the fixed boundary condition of finite element model was also determined. These will help to the following work. Second, drop impact tests of three different heights were carried out. Strains and acceleration responses of PCB were measured. Failed BGA packages of different test conditions were dyeing, and cross section analysis of failed solder joints was conducted. It was found in our drop tests that the root cause of lead-free solder joints under drop impact was the combined effect of mechanical shock and PCB bending vibration.

针对JEDEC标准试件的局限性，提出了设计便于统计学研究焊点可靠性的试验试件的构想，利用有限元模态分析方法确定并验证了用圆形PCB组件替代JEDEC标准试件的可行性；通过一系列模态试验和有限元模态分析，确定了圆形PCB组件的相关试验参数，这不仅为跌落碰撞下PCB组件有限元模拟确定了较为合理准确的有限元模型，而且为正确地评价跌落碰撞下PCB组件的可靠性问题奠定了基础。

This paper introduces the design method, constitution modulus, system's flow chart and function of this system.

介绍了该系统的设计方法、组成模块、系统流程和功能。

A series of porous metallic matrix with various porosity and good shapes were manufactured through adjusting the partitioning among Ni-Cr filler, high temperature solid grains and foamer by loose powder sintering. The elastic modulus of the matrix was measured.

以松装烧结方法为基础，通过调整Ni-Cr合金钎料、高温固相颗粒和造孔剂的配比，采用合适的烧结工艺，制备出具有不同孔隙率、形貌较好的多孔金属胎体试样，并测量了胎体试样的弹性模量。

And their improved methods were also researched, for example the force density method with the triangle element transformed the three links, surface stress density method, surface stress density method of sub-structure and nonlinear finite element method of little youngs modulus.

并且对它们的改进方法，比如三角形单元转化成三杆单元的力密度法、面力密度法、考虑子结构的面力密度法和小杨氏模量的非线性有限元法进行了深入的探讨。

Results. PVA-C compressive elastic modulus increased with increasing PVA concentration and number of FTC's.

结果：PVA-C压缩弹性模量随着PVA浓度和FTC数的升高而增加。

For spheres with constant diameter D, the grading modulus G and the specific surface of a sphere are identical, that is, G =(πD2)/(πD3/6)= 6/D.

那些集料颗粒。对于直径 D 恒定的球体，级配模量 G 和球体的比表面是同一的，即 G =(πD2)/(πD3/6)= 6/D。

The results show that the gabion meshes present good tensile characteristics in the event of the rupture of the meshes. The larger-diameter gabion mesh shows a better mechanical performance, and the mechanical performance of 80RE geogrid is superior to that of 70RE geogrid. The revised relationship curves between the tension per unit width and unit elongation also present elastic stage, yield stage and strength stage. The constraint deformation of reinforcement is influenced by factors such as secant modulus of materials, stress levels, and the length of reinforcement in active area and stable area.

结果表明，格宾网在发生钢丝断裂之后仍呈现出较强的抗拉性能，大直径格宾网体现出优越的力学性能；80RE土工格栅的力学性能优于70RE土工格栅；修正后的格宾网的单位宽度拉伸力与伸长率的关系曲线仍呈现弹性、屈服和强化3个阶段；在约束条件下，筋带的变形量与筋带的割线模量、应力水平、筋带在加筋体中主动区和稳定区的长度等因素有关。

To solve the above problem, for less demanding accuracy, size, modulus relative to similar client who can use the standard spur gear cutter, knife method of molding processing.

针对以上问题，对于精度要求不高，大小端模数相差不多者，可以用标准正齿轮铣刀，一刀成型的方法加工。

The processing principle and method of slotting gear--grooves for big modulus gear wheel with combined milling cutter on a large--scale hobbing machine was put forward in the paper.

提出了在大型滚齿机上。用片铣刀组粗切大模数齿轮齿槽的原理及其工艺。使大模数齿轮的加工效率提高1～2倍。为大模数齿轮的高效加工开创出一条新的途径

This artical presents the principle and equipment for slotting large modulus gear with helical teeth and herringbone gear with narrow slot cutter groove.

文摘：介绍了在大型普通滚齿机上插削大模数斜齿轮和小空刀槽人字齿轮的原理与装置。

Now she was hungry and angry.She began to smoulder.

现在她又饿又气，她开始流露难以抑制的怒火。

You have placed our iniquities before You, Our secret sins in the light of Your presence.

诗90：8 你将我们的罪孽摆在你面前、将我们的隐恶摆在你面光之中。