聚酰亚胺渗透汽化膜的研究(Ⅰ)膜的制备和结构对动态吸附特性的影响

以2种二酐，3种二胺为单体，两步法制备了6种不同结构的聚酰亚胺均质膜，通过红外光谱和元素分析证实了其重复单元的分子结构，测定了这几种膜的物理性质和对水蒸气的动态吸附性能，并计算出其反常扩散指数dw。实验表明，随着聚合物二胺单元分子结构的变化，按MDA、ODA、PDA的顺序，密度逐渐变大，链间距逐渐减小，链堆砌变得紧密，水蒸气在膜中的吸附和扩散也变慢，并出现从正常扩散到反常扩散的过渡现象。     

Risk Factors for Course of Posttraumatic Stress Disorder Among Vietnam Veterans: A 14-Year Follow-Up of American Legionnaires.

Risk factors affecting the course of posttraumatic stress disorder (PTSD) are poorly understood. As part of a larger study on characterizing exposure to herbicides in Vietnam, the authors investigated this issue in a random sample of 1,377 American Legionnaires who had served in Southeast Asia during the Vietnam War and were followed over a 14-year period. High combat exposure, perceived negative community attitudes at homecoming, minority race, depression symptoms at Time 1, and more anger at Time 1 predicted a more chronic course. Community involvement at Time 1 was protective and associated with decreased risk at Time 2. Discomfort in disclosing Vietnam experiences was associated with an increased risk for developing PTSD but did not predict its course. Combat exposure predicted PTSD course more strongly than any other risk factor. Findings suggest recovery from PTSD is significantly influenced by perceived social support. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

动态陶瓷微滤膜净化沐浴污水实用研究

利用自制的动态陶瓷微滤膜对沐浴污水进行了处理,根据处理水质指标及膜操作参数的比较,发现在0.15MPa以下时,膜通量随压力的升高明显增加,大于0.15MPa时,压力对膜通量的影响不明显。合适的操作压力是0.1～0.15MPa,稳定通量为90～110L/m2·h。不同压力出水CODCr去除率达87%～98%、浊度从120°降到3°以下,处理后颜色为无色。并根据实验结果进行了工程化工艺初步设计和经济分析。     

支持向量机在交通量预测中的应用

交通量预测对于区域交通规划有重要意义。提出一种基于支持向量机理论的交通量预测方法。该方法以统计学习理论为基础，通过和BP神经网络进行比较的实验，证明其在交通量预测中的有效性。     

Decision support for AIDS control programmes in Eastern Africa

The Acquired Immune Deficiency Syndrome (AIDS) constitutes the worst hazard to health care systems in Eastern Africa. Misallocation of scarce resources of AIDS Control Programmes will unavoidably lead to additional infections and casualties. The following paper discusses a system dynamics model which allows to assess the impact of different interventions on a pattern population in Eastern Africa. It becomes obvious that short- and long-term consequences of these programmes differ significantly. The optimal allocation of resources, therefore, is highly complex and calls for decision support systems to sustain AIDS control programmes.     

膜分离法回收合成氨弛放气中氢气

介绍了膜分离的原理和应用。实践表明该方法具有效率高、流程简单、操作灵活容易、纯度高和收率高等优点。     

膜-粉末炭反应器净化微污染源水

采用膜-粉末炭反应器处理微污染源水的试验结果表明,该工艺对水中的有机物具有较好的净化效果,在水温《10℃的条件下,处理可生化性很低的三家店水库水时对CODMn的去除率仍保持在65%左右;工艺对CODMn、UV254、UV410的去除效果依次增强.     

利用SiO2包膜技术提高群青蓝颜料耐酸性的研究

采用廉价的SiO2 对群青颜料进行致密包膜 ,使群青颜料耐酸性能得到提高 ,解决了群青在聚氯乙烯型材使用中产生的变色现象 ,拓宽了应用范围     

Transport of chromium(VI) through a Cyanex 921‐supported liquid membrane from HCl solutions

The transport of chromium(VI) through a flat‐sheet supported liquid membrane containing Cyanex 921 as a carrier has been investigated. The permeation of the metal is investigated as a function of various experimental variables: hydrodynamic conditions, concentration of chromium(VI) and HCl in the feed phase, carrier concentration and diluent in the membrane and strippant concentration in the stripping phase. The mass transfer coefficient and the thickness of the aqueous boundary layer were calculated from the experimental data. Furthermore, the selectivity of Cyanex 921‐based flat‐sheet supported liquid membrane towards different metal ions and the behaviour of the system against other carriers are presented. Copyright © 2003 Society of Chemical Industry     

乙基叔丁基醚/β分子筛膜反应精馏

研究了混合碳四和乙醇合成乙基叔丁基醚(ETBE)的反应精馏过程。实验以支撑β分子筛膜为催化精馏元件，异丁烯转化率高达95％，回流比和醇烯摩尔比是影响异丁烯转化率的主要因素。与甲基叔丁基醚(MTBE)的反应精馏过程相比，以乙醇取代甲醇，只需对MTBE生产的操作条件作一些简单的调整，就可在其生产装置上合成ETBE。