卫星信号地面接收干扰的解决方案探讨

简要介绍了卫星信号地面接收受干扰时的解决思路,着重介绍了几种异地接收回传方案,给出了系统原理结构框图及该方案的优缺点.     

直流电阻箱检定装置测量不确定度的评定

重点论述了直流电阻箱检定装置的不确定度来源，并对此检定装置的不确定度进行了分析与计算。     

Impact of fluid path geometry and operating parameters on l/l-dispersion in interdigital micromixers

The dispersion of two immiscible fluids in interdigital micromixers was investigated using silicon oil/water and <em>n</em>-heptane/water as test systems. The experiments revealed the dependence of the average droplet size and size distribution on geometrical parameters of the micromixer and operating conditions. The mean droplet size was found to be correlated with total volume flow, volume flow ratio and corresponding pressure drop of the two liquids for a given micromixer geometry, which could be explained in light of the energy input. As a major focus, the effect of mixing chamber geometry and feeding system geometry was investigated with regard to droplet size distribution by systematically varying decisive dimensions in the mixer and by changing the feeding structure. It was shown that reducing the slit height and the number of feeding channels had a significant effect on droplet size distribution, leading to a smaller mean droplet size. Furthermore, the dispersion efficiency was also investigated by an extraction process.     

试论职工队伍技术素质下降原因及对策

21世纪世界经济的竞争是人才的竞争。而我国目前产业工人队伍的技术素质令人担忧，本文论述了职工队伍技术素质下降的原因及对应的解决办法。     

具有影像增强反射层的全彩色透反射型胆甾相液晶显示器

本文介绍了一种低功耗全彩透反射型液晶显示器。该液晶显示器利用高双折射率(Δn)胆甾相液晶(Ch-LC),并在透射区域的顶部设置了一块影像增强反射层(IER)。高双折射率(Δn)胆甾相液晶能够反射宽波段的光而显示白色图像。采用传统的彩色滤光膜方法就可以显示全彩色图像。此外,在透射区顶部的IER为透射光和反射光提供了相似的光路。在任何环境下,透射区与反射区总是显示相同的图像颜色,因而大大提高了全彩色透反射型胆甾相液晶显示器显示图像的质量。     

空调室内三维紊流流动与传热的数值模拟

采用三维紊流模型，应用有限容积法计算了室内空调的气固耦合传热问题，并对室内空调的气流组织形式，主要是对流速场，温度场进行了数值模拟计算，为空调室内的气流组织形式的优化设计及舒适性提供了研究依据。     

传统文化与建筑设计的关系

2004年世界遗产大会在中国的苏州举行，这引起了人们对于文化继承问题的思考。对于城市文明表征之一的建筑来说更是一个不容忽视的问题。在建筑设计过程中批判地继承传统文化中的精华，剔除不合时宜的旧俗，可以使得中国的建筑更有自己的特色，更能满足现代人对建筑的物质和精神的需求。     

南海西江大位移井井壁稳定性评估研究

利用井壁稳定性分析的集成技术,对南海西江24-1油田钻成的超大位移井的井壁稳定性进行了评估研究,通过对孔隙压力、地应力、地层强度特性的系统分析,结合测井资料处理确定了该油田安全钻井液密度窗口,并成功地应用于指导该井合理钻井液密度的确定及井身结构优化设计。对西江24-1油田井壁稳定性的评估结果,否定了国际权威研究机构得出的"在西江24-1油田井斜角大于45°将不能保持井壁稳定"的结论,为成功地钻成南海西江大位移井发挥了重要的指导作用。     

Thermodynamic Aspects of Iron in Metal Dusting

A theoretical analysis has been conducted into the thermodynamic role of iron and the dependence of possible metal-dusting occurrence on temperature, volumetric ratios of carburizing species CH<sub>4</sub> and CO, and total pressure. The analysis indicates that the equilibrium carbon activity with cementite (<i>a</i> <sub> <i>C</i>(<i>Fe</i> </sub> <sub>3</sub> <sub> <i>C/Fe</i> </sub>)) decreases with increasing temperature, and becomes lower than unity in excess of approximately 1000°C. This critical temperature could be the upper-temperature limit for decomposition of cementite in metal dusting. The temperature regime for possible metal dusting in either CH<sub>4</sub>–H<sub>2</sub> or CO–CO<sub>2</sub> gas mixtures increases with increasing volumetric ratio of CH<sub>4</sub> or CO. Increasing total pressure leads to a reduction of this temperature regime in CH<sub>4</sub>–H<sub>2</sub> but an expansion in CO–CO<sub>2</sub>. Comparatively, this temperature regime in CO–CO<sub>2</sub> is shifted more towards lower temperatures, and iron is likely more susceptible to metal-dusting attack in CO–CO<sub>2</sub> due to the higher reverse carbon-activity gradient established.     

P91对钢管的力学性能研究

研究了成都无缝钢管厂生产的P91钢管的常温和高温力学性能。研究表明：温度和应力对材料的高温强度和持久强度有很大的影响；国产P91钢管具有较好的高温力学性能，与国外同类产品性能一致。讨论了P91钢管的常温低周疲劳特征。