干膜掩孔破裂问题探讨

1前言 线路板的制作流程复杂,问题多,常有"莫名其妙来,莫名其妙去"的说法.而干膜掩孔破裂问题也经常是来无影,去无踪;问题来时,工程师和问题解决的参与者一般从以下几方面着手:

民航飞机驾驶舱挡风玻璃破裂问题研究

提起飞机技术性要求非常高的部件,很少有人会提及驾驶舱挡风玻璃,但在现实生活中,飞机挡风玻璃却发挥着重要作用。飞机挡风玻璃与其他高科技产品相似,且现在关键技术依然掌握在国外大公司手中。飞机挡风玻璃的结构由外层、内层、中间层及胶合层组成,结构层和非结构层各司其职才能有效发挥挡风玻璃的作用。本文首先从潮气入侵导致外层玻璃破裂、细小损伤的忽视导致破裂、复合玻璃本身缺陷导致疲劳破裂、人为原因与外来物撞击等角度分析了可能造成挡风玻璃破碎的原因。并提出相应的解决方案,其关键点还是加强结构设计与原材料把关。最后本文认为应理性看待飞机事故,并在乘坐飞机时积极做好个人防护。

“高田气囊事件”大众通用奔驰未见召回

7月5日,质检总局执法督查司就气体发生器破裂问题集体约谈大众、通用、奔驰公司,通报高田气囊气体发生器破裂问题缺陷调查情况,要求尽快采取相应措施,履行缺陷召回法律义务,切实消除安全隐患。据统计,高田气囊气体发生器破裂问题在中国共涉及37家汽车生产者,涉及车辆2000余万辆。截至今年6月底,中国共有24家生产者实施召回102次,涉及车型97个,数量达到1059万辆。

Guest Review:Potential theory method for 3D crack and contact problems of multi-field coupled media: A survey

This paper presents an overview of the recent progress of potential theory method in the analysis of mixed boundary value problems mainly stemming from three-dimensional crack or contact problems of multi-field coupled media. This method was used to derive a series of exact three dimensional solutions which should be of great theoretical significance because most of them usually cannot be derived by other methods such as the transform method and the trial-and-error method. Further, many solutions are obtained in terms of elementary functions that enable us to treat more complicated problems easily. It is pointed out here that the method is usually only applicable to media characterizing transverse isotropy, from which, however, the results for the isotropic case can be readily obtained.

讨人喜欢的咖啡保温瓶

这款讨人喜欢的Bonne咖啡保温瓶是Stelton经典产品,由设计师Flemming Bo Hansen设计,美丽的圆滑造型,直觉地让人联想到咖啡豆的形状。瓶身采用雾面处理,有黑、红、白3种颜色可以选择,皆搭配黑色把手,个性十足。把手设计符合人体工学,非常方便抓握。