某建筑群外墙MCM板及保温脱落原因鉴定分析与建议

结合北京某商业园一期建筑外墙软瓷饰面及保温脱落问题实例,通过现场对外墙外保温系统的热工缺陷、整体外观质量、构造做法、粘贴及锚固等方面的检测情况,从设计、材料、施工、外界环境等方面对脱落的原因进行分析。通过设计方面可知,针对加气混凝土砌块墙体外保温采用岩棉板而未采用岩棉带,此做法与相关技术规程不符,存在一定程度的缺陷;通过材料方面分析可知,该工程采用新材料,但未有施工技术标准或规程支撑,亦未进行可行性研究,存在不妥;另外,所用锚栓规格未按要求采用;通过对其施工质量的分析可知,岩棉板未作界面处理、岩棉板粘锚不满足质量要求、饰面砖粘贴强度不满足要求;通过外界环境影响分析,该建筑所处位置会存在“峡谷效应”,其负风压大,当遇大风天气时,外墙外保温极易产生脱落情况。通过对该工程质量问题产生原因的综合分析,从设计、材料和施工方面提出了相应的整改建议。

大规模MCM基板互连探针测试和路径优化

已有的路径优化算法在MCM基板互连测试中已经发挥了一定的作用,但由于MCM的高密互连特性,使得测试变得更加复杂和困难,因此人们希望能引入新的方法与思路,以解决MCM基板互连测试的路径优化问题。将蚁群算法应用到互连测试探针路径优化问题当中,根据MCM基板互连测试的特点,建立探针路径优化的模型。提出一种针对大规模MCM基板互连探针测试的方法,首先将MCM基板进行分片,然后对每片进行优化,最后将优化结果连接在一起,成为一条完整的路径。实验结果表明,蚁群算法能在较短的时间内得到更优的路径。

MCM低温共烧多层陶瓷布线基板热应力的模拟与分析

对ＭＣＭ低温共烧多层布线陶瓷基板的两种典型布线模式在温度急剧变化条件下的应力场进行了计算机模拟，并分析了两种模型下的应力分布特点及差异。

MCM基板互连测试的单探针路径优化研究

针对MCM基板互连测试所采用的单探针技术,本文提出一种基于蚁群算法的单探针路径优化算法,通过设定合适的规则,引导探针的移动,缩短探针移动的距离,达到减少测试时间提高MCM生产效率的目的。从基于MCM标准电路的仿真结果看,采用蚁群算法得到的探针测试路径长度远远优于其它算法所得到的。

Effect of Hydrophobic Carbon Chain Length on the Crystal Structure of MCM-41

The mesoporous molecular sieve (MCM)-41 using ionic liquid as template has been prepared. The typical template of ionic liquid was [C16mim]X. In this article, the use of 1-alkyl-3-methylimidazolium ([Cnmim]Br, where n=12,14,16,18,20) salts as templates in the synthesis of MCM-41 is reported. The results showed that the synthesized MCM-41 had uniform pore diameter, high surface area and stable framework. The largest surface area of MCM-41 was the one prepared with [C14mim]Br as template. When using [C18min]Br as template, the narrowest pore distribution sample was obtained and the effect of surface tension of template solution to MCM-41 was first discussed.

Synthesis of magnetic core–shell structure Fe_3O_4@MCM-41 nanoparticle by vesicles in aqueous solutions

In this study, magnetic core–shell structure Fe3O4@MCM-41 nanoparticles were synthesized with vesicles as soft templates. In the preparation, Fe Cl2 and tetraethy orthosilicate(TEOS) were selected as Fe processor and Si precursor, respectively. Stable vesicles first formed in 0.03 mol·L-11:2 mixture of anionic surfactant sodium dodecyl sulfate and cationic surfactant cetyltrimethyl ammonium bromide. Then, TEOS was added in the vesicle aqueous solution, leading to a highly dispersed solution. After high-temperature calcination, Fe3O4@MCM-41 nanoparticles were obtained. Their structure and morphology were characterized by Saturn Digisizer, transmission electron microscope and vibrating sample magneto-meter. The results indicate that the vesicles are spherical and their size could be tuned between 20 and 50 nm. The average grain diameter of synthesize magnetic core–shell Fe3O4@MCM-41 particles is 100–150 nm and most of them are in elliptical shape. The dispersion of magnetic particles is very good and magnetization values are up to 33.44 emu·g-1, which are superior to that of other Fe3O4 materials reported.

基于MCM—L技术的一种集成电感器性能分析

文章介绍采用叠层基片上的多芯片组件（MCM—L）技术制造的集成电感器，同时分析该组件在典型的射频电路中的应用。这种集成电感器与分立式电感器比较，具有可靠性高、性能优良、成本较低等优点。