CONCENTRATION POLARIZATION ANALYSIS AT THE ENTRANCE REGION OF A FLAT SHEET PERVAPORATION MODULE FOR VOC REMOVAL

Concentration polarization is a phenomenon that is inherent in all membrane separation processes, which is difficult if not impossible to measure experimentally. Concentration polarization in a pervaporation module causes flux decline and is therefore an important issue in predicting the performance of the membrane unit for evaluation and optimization. Short-form (small L/D ratio) membrane configurations, commonly used for membrane evaluations or certain material separations, compound the complexity of process modeling that addresses concentration polarization since a substantial portion of the membrane flow channel would be considered as an “entrance region” based on the flow profile that is not fully developed. This article employed the classic boundary layer theory, combined with mass transfer phenomena in a pervaporation process that is used in volatile organic compound (VOC) removal from contaminated water sources, to theoretically analyze the concentration polarization severity in the entrance region of a flat sheet membrane module.     

Decision Support for DCs Location and Distribute Range Planning: Case Study in Asia-Pacific Region

A major concern is to locate manufacturing plants and/or distribution centers to serve the needs of consumers widely and rapidly with reasonably distributive cost and flexible delivery time. The purpose of this research is to help enhance a decision support for three distribution center locations with different ranges of area in order that the distributors are able to serve appropriately the retailers in twelve large cities or capitals of the nine countries in Asia-Pacific region. The researcher applies the theory of supply chain and logistics management systems with Excel, Visual Basic and Genetic Algorithms programs to find the research results. The research results revealed that the interfaces of Excel, Visual Basic, and Genetic Algorithms programs helped decision support in distribution range selection for 3 distribution center locations. Each of which had different ranges of area for distribution with a rapidly, flexibly distributed time. However, variables resulting in a decision-making should be adjusted under certain circumstances for more reliable, specific needs.     

任意导体与线天线连接问题的MoM分析

对线天线与导体的连接问题进行了矩量法分析，并提出了奇异城分离法，很好地解决了某些矩阵单元积分奇异性的问题。该方法适用于任意形状线天线与任意形状导体的表面、棱边或者顶点相连的情形，且所占内存少、精度高。数值实例表明了此方法的有效性。     

热载体加热炉炉膛最高热强度和炉管管壁最高表面温度的计算

本文对燃气、燃油的热载体加热炉的炉内燃烧区过热点进行了理论分析，给出了炉膛内燃烧区最高热强度大小和位置的计算方法，并且确定出炉管管壁的最高表面温度和膜温度。     

渤海地区中侏罗世和早白垩世孢粉组合

选用14口井的孢粉化石资料,将鉴定出的50个属、110个种概括为4个组合.根据孢粉组合特征提出了渤海地区中侏罗世和早白垩世地质时代最新划分意见,为该区中生界划分与对比提供了较可靠的孢粉学依据.     

徐家围子地区天然气成藏期次及其模式

利用实测流体包裹体均一温度的分布特征，结合埋藏史和热史，确定出徐家围子地区烃类气体的注入时期。根据该区沙河子-营城组生烃排气期、登二段泥岩盖层封闭形成时期和断裂活动时期，得到徐家围子地区天气藏主要形成于泉头组沉积时期。有断裂沟通的气藏可以形成于泉头组沉积时期。有断裂沟通的气藏可以形成于嫩江组沉积末期，但规模有限。徐家围子地区具有4种天然气成藏模式：沿不整合面运移至其岩风化壳圈闭成藏、沿裂缝运移至源岩内火山岩圈闭成藏、沿断裂运移至古隆起之上各种类型圈闭成藏、沿砂体侧向运移至地层超覆圈闭成藏。     

寒冷地区面板堆石坝面板顶部止水研究

针对寒冷地区面板堆石坝面板顶部止水遭破坏情况，对破坏机理进行了分析。通过室内试验及现场试验，提出了适合寒冷地区的面板顶部止水结构和止水材料，成功地解决了莲花面板石坝面板止水缝表面防护问题，并为混凝土面板坝的面板顶部止水设计及巳建的面板顶部止水破坏修补提供参考。     

复合材料层压板振动参数的铺层顺序优化研究

本文针对目前在复合材料结构设计中较少考虑的振动特性优化问题,采用减缩区间法与枚举法相结合的手段,对给定层数和角度的层压板进行了铺层顺序的优化研究,使其满足振动频率和模态阻尼的要求。通过对20层对称层板的计算可以看出,采用本文所述方法,不仅可节省大量计算时间,而且所得的频率和比阻尼容量值与实验结果具有良好的一致性,证明了该方法的可靠性。本文的研究可作为工程设计中一种有效的手段,所完成的软件具有一定的工程应用价值。     

弹性产率概念在油藏边水作用特征分析中的实际应用

弹性产率是油田开发初期评价油藏弹性生产能力，分析驱动能量大小的重要指标。对于有边水作用的油藏，利用这一概念不仅能够分析边水驱动能量的大小，而且可以根据单井生产特征，判断边水的作用区域和推进方向，进而确定油藏开发过程中剩余油分布。本文利用弹性生产率概念，分析了王徐庄油田五断块边水作用特征，并提出了几点认识。     

850 nm有源区无铝高功率SCH-SQW激光器

设计并制作了条宽 10 0 μm ,腔长 1mm的有源区无铝高功率SCH SQW激光器 ,室温连续输出功率达 1W ,阈值电流密度为 46 0A/cm2 ,外微分量子效率为 0 6 8W/A ,激射波长为 849nm(腔面未镀膜 )。