含长贯通导线腔体电磁耦合数值分析与实验研究

基于时域有限积分方法建立了含长贯通导线金属腔体电磁耦合数值模型,分析了平面波辐射下贯通导线长度、电场极化等参数对腔体屏蔽效能的影响;提出了基于吉赫横电磁波传输室搭建实验平台的新方法,对数值结果进行了验证;建立了耦合等效电路,并分析了耦合机理.研究表明:贯通导线对电磁波耦合作用显著,腔内屏蔽效能下降约30dB;贯通导线有频率选择特性,当其电长度ξ约为1/2的整数倍时谐振;外部导线长度对腔体谐振频率及屏蔽效能无影响;内部导线长度及腔体壁厚度主要影响腔体谐振频率;距贯通导线越远,屏蔽效能值越大;贯通导线方向上电场分量增大,屏蔽效能变差.     

浅埋工程围护结构传热简化模型误差的有限元分析

为近似计算工程的热湿负荷，通常将地下工程拱形结构的断面等周长地简化为矩形断面。本文采取大型通用有限元分析软件ANSYS对原模型和简化模型进行瞬态热分析，分别对等周长的拱形断面或长方形断面采取等单元密度划分，在两个断面上分别形成间距相同的206个节点，通过不同时间点断面上间距相同的18个节点的平均温度及断面瞬时传热量的比较，判断简化模型的精度。模拟结果表明，简化误差很小，而且随着时间的推移和工程埋深的加大，误差逐渐减小。     

智能化声学控制的隔声罩

为了满足机械设备在变工况条件下运行的噪声控制需要,在声学理论的基础上推出作吸声处理隔声罩内任一点的声压随气体媒质压强的变化公式,并将隔声罩技术与PLC控制技术相结合,设计出一种可以根据噪声辐射的强弱自动调整隔声量的智能隔声罩。该隔声罩通过改变罩内的真空度,来对其隔声量进行调节,整个过程是由传感器、PLC及伺服电机等组成的控制系统来实现,能同时完成对低频、中频和高频噪声的控制,具有易于自动化,智能化的特点。某钢铁厂煤气压缩机房一年多的使用情况证实此方法的有效性。     

Effects of enclosure size on sexual behavior of Japanese quail (Coturnix japonica).

The authors determined whether results of experiments on copulatory and affiliative behavior of pairs of Japanese quail (Coturnix japonica) conducted in a closely confining apparatus would predict behavior in a large enclosure in which female quail could avoid contact with male quail. As found previously in studies of closely confined quail, in a large enclosure containing numerous barriers, both unmated female quail and mated female quail laying unfertilized eggs were more likely to remain near a confined male quail than were mated female quail laying fertilized eggs. Furthermore, the number of copulations that a pair engaged in when closely confined predicted the number of copulations that they engaged in when they were in the large enclosure. Patterns of affiliation and of mating in a confining laboratory apparatus thus predicted behavior in a larger enclosure that provided female quail with opportunity to avoid contact with male quail. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Experimental investigation on thermo‐driving heat transfer in porous medium in a centrifugal force field

Based on the research in turbine blade super cooling techniques, experiments were carried out to investigate the thermo‐driving heat transfer phenomenon in a new cooling configuration filled with porous medium in a centrifugal force field. Moreover, the heat transfer effectiveness of the configuration was compared to one with no porous medium. The results showed that the thermo‐driving heat transfer effectiveness of the configuration filled with porous medium could be enhanced by increasing the rotating speed, heat flux, and cooling air speed. Meanwhile, the heat transfer effectiveness of the configuration was strengthened with the installation of porous medium. © 2008 Wiley Periodicals, Inc. Heat Trans Asian Res, 37(6): 329– 338, 2008; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/htj.20219     

屏蔽机箱设计分析

一个好的机箱对于避免或减小电磁干扰、电磁辐射等具有重要作用,为此主要就设计屏蔽机箱时应全面考虑的问题进行了详细分析,并给出了一些实际建议。     

滨北地区黑鱼泡凹陷断层封闭性分析

本文在松辽盆地滨北地区黑鱼泡凹陷内的断裂特征认识的基础上,选择了8条有代表性的断裂,应用逻辑信息法对其封闭性进行了分析。其结果是:凹陷内断层的封闭性程度多属中等和差级;对于T_2-2和T₀₆层,凹陷内断层封闭性北部比中部和南部要好;T_2-2层北部和南部比中部好;T2层北部相对好些。总体上看,北部断层的封闭性比南部的稍好,中部比较差。     

大型深基坑自立式围护结构的设计和施工

采用双排灌注桩加环压梁形成基坑围护，辅以分段开挖、外围卸土的措施，使深基坑施工有了安全保证。     

Hold Time Calculations for Non-Standard Enclosures

Current methods of calculating hold time for a fire fighting gas assume that the enclosure is of uniform horizontal cross-sectional area and has horizontal upper and lower boundaries (a standard enclosure). The paper shows that the hold time equation for continuous mixing in standard enclosures may also be used for non-standard enclosures, presents exact and simplified equations for descending interfaces in non-standard enclosures, and discusses the accuracy of the simplified equation. Considering the error when the simplified equation is applied to standard enclosures, and that it is always conservative for an enclosure of any shape, it is suggested that it may be used as an approximation for non-standard enclosures. The paper also presents a hold time equation for a descending interface in a standard enclosure with laminar flow in the leaks.