MEMS封装技术研究进展

介绍了MEMS封装技术的特点、材料以及新技术,包括单片全集成MEMS封装、多芯片组件(MCM)封装、倒装芯片封装、准密封封装和模块式MEMS封装等。文中还介绍了MEMS产品封装实例。     

多功能糖果包装机机构及性能的研究

糖果等食品的多粒枕式包装是食品行业亟需解决的问题。本文对球形和椭圆形糖果的多粒枕式包装进行了初步的探讨，着重阐述了理糖装置和光电控制系统的设计。     

工艺因素对金属封装外引线弯曲疲劳的影响

考察了金属封装外壳制造工艺对外引线弯曲疲劳的影响,发现电镀镍是导致外引线弯曲次数明显减少的最主要工艺步骤,且随镀镍层厚度的增加,弯曲次数减少。此外还讨论了外引线的氢含量和晶粒度对引线抗疲劳能力的影响。     

APPLICATION OF GRAY SYSTEM THEORY IN SBS MODIFIED ASPHALT

A system whose partial information is known and partial information is unknown is called gray system. In this paper, the compatibility relationship between Styrene-Butadiene-Styrene (SBS) modifier and base asphalt composition was studied by correlation analysis method. The analysis results of correlation level show that aromatics and asphaltene of base asphalt affect SBS modified effect mainly as the content of SBS is lower, while the content of aromatics and resin become the main effect factors as SBS content is increased.     

Comparison of inward and outward grown Pt modified aluminide diffusion coatings on a Ni based single crystal superalloy

Two commercial Pt modified aluminide coatings (RT22 and MDC150L) on the same single crystal Ni-based superalloy (CMSX-4) were studied by: scanning electron microscopy; transmission electron microscopy; energy dispersive X-ray spectrometry; and gravimetry. The RT22 coating is an inward grown coating (high activity), while MDC150L is produced by outward growth (low activity). Samples were oxidised in still laboratory air at 1050 °C for various times up to 2000 h. It was found that the outward grown coating produced a slower growing oxide that was more spallation resistant. Several possible reasons for this were identified including: coating purity; coating surface topography; and ductile to brittle transition temperature. The microstructural differences between the two coatings in the as-coated condition were investigated and the development of their microstructure during heat treatment was described. A model for coating growth during heat treatment was proposed.     

分析矩形光波导损耗的简易方法

利用有效折射率和修正的有效折射率方法对矩形光波导的损耗作了简单有效的分析，并且计算出了纵向传播系数和衰减系数的大小。     

High temperature controlled atmosphere experiments for catalysts in a transmission electron microscope

A new transmission electron microscopy (TEM) specimen preparation procedure for high temperature experiments using a controlled atmosphere specimen holder (HTCASH) has been developed. It is designed for studying the microstructure of catalyst specimens before and after treatments in various gases. The procedure involved (1) finding a new formula for the embedding material, (2) devising a new method of making specimen supports, and (3) developing a method for removing the embedding material after the specimen has been microtomed. These techniques were then brought together to produce the ideal specimens for the HTCASH experiments. As an extra benefit, this procedure is also suitable for preparing specimens for ultrahigh resolution imaging experiments. The application of the new procedure in HTCASH experiments is illustrated through a high temperature reduction of a Co/SiO₂-923 catalyst.     

改性石英砂滤料强化过滤处理含藻水

采用改性石英硝滤料强化过滤处理含藻水的试验结果表明，与石英硝滤料相比，改性石英硝滤料对含藻水具有优良的处理效果；经混凝沉演后水中的余铝对藻类的去除有促进作用。     

Chaos Synchronization between the Coupled Modified Chua's Circuits with Nonlinear Quadratic Function x|x|

1　ＩｎｔｒｏｄｕｃｔｉｏｎＴｏｄａｙ ,ｍｕｃｈａｔｔｅｎｔｉｏｎｈａｓｂｅｅｎｐａｉｄｔｏｃｈａｏｓｓｙｎｃｈｒｏｎｉｚａｔｉｏｎ[1 ,2 ] .Ｃｈａｏｓｓｙｎｃｈｒｏｎｉｚａｔｉｏｎｃａｎｍａｉｎｌｙｂｅｃｌａｓｓｉｆｉｅｄｉｎｔｏｔｗｏｔｙｐｅｓｃａｌｌｅｄｍｕｔｕａｌｓｙｎｃｈｒｏｎｉｚａｔｉｏｎａｎｄｍａｓｔｅｒ ｓｌａｖｅｓｙｎｃｈｒｏｎｉｚａｔｉｏｎａｃ ｃｏｒｄｉｎｇｔｏｔｈｅｃｏｕｐｌｉｎｇｃｏｎｆｉｇｕｒａｔｉｏｎ[3,8] .Ｔｈｅｆｏｒ ｍｅｒｉｓｗｉｔｈｂｉ ｄｉｒｅｃｔｉｏｎａｌｃｏ…     

Revising deductive knowledge and stereotypical knowledge in a student model

A user/student model must be revised when new information about the user/student is obtained. But a sophisticated user/student model is a complex structure that contains different types of knowledge. Different techniques may be needed for revising different types of knowledge. This paper presents a student model maintenance system (SMMS) which deals with revision of two important types of knowledge in student models: deductive knowledge and stereotypical knowledge. In the SMMS, deductive knowledge is represented by justified beliefs. Its revision is accomplished by a combination of techniques involving reason maintenance and formal diagnosis. Stereotypical knowledge is represented in the Default Package Network (DPN). The DPN is a knowledge partitioning hierarchy in which each node contains concepts in a sub-domain. Revision of stereotypical knowledge is realized by propagating new information through the DPN to change default packages (stereotypes) of the nodes in the DPN. A revision of deductive knowledge may trigger a revision of stereotypical knowledge, which results in a desirable student model in which the two types of knowledge exist harmoniously.