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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。

We invite you to come and be a part of TVI's opportunity seminars and meetings, FORTUITY, conducted by our team of ever expanding Entrepreneurs from around the Globe in their local regions.

保留您的席位，这只是开始，并会打击您的想法，因为我们进入到不同的市场，一个新的和战略性的办法使我们的经销商了前所未有的机会之窗声称其作品的成功。

Experiments on simulated and real image data are conducted. The results show that this algorithm is very robust to noises and outliers, and the fundamental matrix with high accuracy can be found.

大量的模拟数据和真实图像的实验结果表明，此算法不仅具有良好的鲁棒性，而且可提高基础矩阵的估计精度。

Because bosses are very bad at articulating exactly what it takes to be successful, people below them are left guessing,' says Jennifer Chatman, professor of management at UC Berkeley's Haas School of Business, who has conducted research on recruiting and ingratiation.

"因为老板们说不清楚成功到底需要些什么，下面的人就只能猜了，"加州大学伯克利分校哈斯商学院(UC Berkeley's Haas School of Business)的教授詹妮弗·查特曼说，她进行过招聘和逢迎方面的研究。

My first question would be around the 1970's at the Pennsylvania Exploration Center you conducted a series of experiments that led to the discovery of Tau Lepton.

我的第一个问题将在1970年在宾夕法尼亚州的探索中心你进行了一系列实验，结果发现轻子的头。

Perhaps we should never procure a new suit, however ragged or dirty the old, until we have so conducted, so enterprised or sailed in some way, that we feel like new men in the old, and that to retain it would be like keeping new wine in old bottles.

也许我们是永远不必添置新衣服的，不论旧衣服已如何破敝和肮脏，除非我们已经这般地生活了，或经营了，或者说，已向着什么而航行了，在我们这古老的躯壳里已有着新的生机了，那时若还是依然故我，便有旧瓶装新酒之感了。

The all-purpose safety plug has the advantages that when the contact of the earth wire is not conducted, the live wire and the null line can not be connected, in order to cut the power supply, therefore, the use safety is guaranteed.

优点：在地线触点未导通时，相、零线不能合上而切断供电，保障使用安全。

This indicates that seed production of the studied species must be reduced by available resources. To detect the difference of seed production between flowers pollinated by self and outcross pollen, hand pollination for bagged flowers has also been conducted in natural populations of the two Pedicularis species.

除了上述结果外，我们的人工实验还表明，人工补充授予同株或异株的花粉都未能增加种子产量，而疏花处理则明显的增加了剩余花的结实，这说明较之于花粉数量的限制而言，资源限制是影响这两种植物雌性育性的原因。

Object: Cerebral vasospasm constitutes a major complication of subarachnoid hemorrhage. The pathogenesis of cerebral vasospasm is unclear, in spite of intensive investigations conducted over the past years. Even though multiple factors are proposed to be involved in cerebral vasospasm, oxyhemoglobin is one of the most important spasmogens for cerebral vasospasm that fallows aneurismal SAH.

目的：脑血管痉挛是蛛网膜下腔出血后最常见和最严重的并发症，近年来人们对SAH所致脑血管痉挛的发生机制进行了大量的研究，但迄今尚未完全阐明，众说纷纭，甚至有些观点相反，但几乎所有关于脑血管痉挛原因的报告都认为，脑血管痉挛是多种原因造成的，其中氧合血红蛋白是SAH后血管痉挛的主要启动因素之一，它对内皮细胞及平滑肌的细胞毒作用已经被报道。

For its unique hydrology, the rule of the non-point pollution of polder is particular and is very important to be studied.A typical agricultural watershed and runoff plots in polder areas around Taihu Lake were selected and experiment in situ was conducted.

同时由于圩区与外界水流交换的特殊性，其营养盐产生、迁移及转化规律亦具有其独特性和复杂性，因此研究太湖流域典型圩区非点源污染产污特征具有十分重要的意义。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。