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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。

Ltd. is expected to play a critical role in SanDisk's operations as the plant is set to focus on the assembly and test of flash memory products.

这家 SanDisk 半导体有限公司设在上海紫竹科学园区，专注做装配和测试闪存产品。

Main Products: solenoid valve, pneumatic valve, flashboard valve, standard parts, such as vacuum and vacuum system design and assembly debugging.

公司主要产品：电磁阀、气动阀、插板阀、真空标准件等以及真空系统的设计与组装调试。

You need to carefully flatten each round segment before you do the final assembly.

你需要仔细每一轮市场扁平化之前，完成最后的组装。

Keywords: Molecular assembly; DNA; Cyclodextrin; Flourescent probe; Intramolecular charge transfer

中文关键词：组装；DNA；荧光探针；环糊精；分子内电荷转移

Molecular assembly; DNA; Cyclodextrin; Flourescent probe; Intramolecular charge transfer

此外，合成了含硼酸的具有分子内电荷转移的荧光探针，研究它与人血清白蛋白、DNA及药物的作用机理。

Support assembly and test procedures, work flow diagrams, shop layout to meet production forecasts.

向组装和测试流程、工作流程图、车间布局提供支持以实现生产预测。

A data acquisition and data analysis software for the fast fluorscence kinetics fluorometer of our laboratory is redesigned and recompiled using assembly and BASIC language. The data acquisition rate in the fast rising part of the fluorescence kinetics curves is one order faster (100μs/point) than the old one. It can measure fluorescence parameters, such as Fo and Fi more accurately for calculation of the relative content of inactive PSⅡ, etc.

用N80-BASIC语言结合汇编语言重新编写了本室快速叶绿素动力学荧光计的测控程序，使快速荧光上升曲线的采样速度提高了一个数量级（达到100μs／点），可对Fo、Fi等关键荧光参数进行精确测定，为无活性PS Ⅱ中心相对含量的准确测定奠定了基础。

The Liberty 20 Gallon Foamer includes a 12 metre discharge hose assembly with stainless steel ball valve and both a fan nozzle and a zero degree nozzle.

在自由20加仑发泡剂，包括一个不锈钢球阀，都一和零度喷嘴风扇喷嘴12米排放软管总成。

The driving force of this self-assembly procedure is capillary force and the water droplets play the role as template.

孔径的尺寸可在1微米到10微米之间控制，形成多孔结构的驱动力是Marangoni对流效应和水平毛细管力。

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