Y型沸石膜的制备及在二氯乙烷和氮气混合物分离中的应用

在多孔α-Al2O3陶瓷管的外表面水热合成NaY型沸石膜,用XRD及SEM表征所合成的膜.并将合成出的膜用于分离二氯乙烷和氮气的混合物,考察了不同压力差对分离效果的影响.实验结果表明,将渗透压差控制在50 kPa,既可保证有较高的渗透率,又有一定的分离因数.     

海南近海点带石斑鱼野生和养殖群体微卫星多态分析

采用微卫星分子标记技术对海南近海点带石斑鱼野生和养殖群体的遗传变异进行了研究.实验所用点带石斑鱼分别于2005年6月和9月取自海南万宁石斑鱼养殖基地和三亚近海,均为20尾,取全血以酚-氯仿抽提方法提取基因组DNA,利用微卫星引物进行PCR扩增,反应产物经8%非变性聚丙烯酰胺凝胶电泳分离、银染显色,并计算了相应的遗传学参数.结果表明,在野生和养殖群体中, 7个基因座位的等位基因平均数(A)分别为3.29和3.29,每个基因座位有效等位基因数(ae)分别为1.90～3.68和1.83～4.06,野生和养殖群体平均杂合度(Ho)分别为0.790 4和0.833 7;两个群体间的遗传相似性系数为0.832 5,遗传距离为0.183 4.由此可知,点带石斑鱼野生群体的等位基因数、平均有效等位基因数等于养殖群体,而杂合度两群体相当(P=0.637>0.05),说明海南近海点带石斑鱼野生和养殖群体的种质资源较好.     

某110kV变压器油介质损耗增大原因分析

针对1台110 kV变压器油介质损耗因数增大问题,通过调查分析,确定其原因是绝缘油老化引起的设备缺陷。为此,制定变压器油处理的工艺及验证试验方案,并付诸实施。结果表明:使用绝缘油的再生—净化处理工艺降低了绝缘油的介损指标,高压试验介质损耗合格,绝缘恢复正常。     

Investigation on emission factors of particulate matter and gaseous pollutants from crop residue burning

Emission factors of particulate matter (PM), element carbon (EC), organic carbon (OC), SO_2, NO_x, CO, CO_2, and ten ions (Na~ , NH_4~ , K~ , Mg~(2 ), Ca~(2 ), F~-, Cl~-, NO_2~-, NO_3~-, SO_4~(2-)) were estimated from the domestic burning of four types of commonly produced crop residues in rural China: rice straw, wheat straw, corn stover, and cotton stalk, which were collected from the representative regions across China. A combustion tower was designed to simulate the cooking conditions under which the peasants burned their crop residues in rural China, to measure the emission factors. Results showed that wheat straw had the highest emission factor for the total PM (8.75 g/kg) among the four crop residues, whereas, corn stover and wheat straw have the highest emission factor for EC (0.95 g/kg) and OC (3.46 g/kg), respectively. Corn stover also presents as having the highest emission factors of NO, NO_x, and CO_2, whereas, wheat straw, rice straw, and cotton stalk had the highest emission factors of NO_2, SO_2, and CO, respectively. The water-soluble ions, K~ and Cl~-, had the highest emission factors from all the crops. Wheat straw had a relatively higher emission factor of cation species and F~-, Cl~-, NO_2~- than other residues.     

关于P-V因数在磨损可靠性设计中应用的思考

P -V因数是对摩擦副在边界润滑状态下工作 ,而规定的一个设计准则。由于磨损失效是XB型轴向柱塞泵的主要失效形式 ,所以 ,笔者提出 ,通过引用P -V因数的广义概念 ,建立起磨损可靠性基本设计的模型 ,并对XB -F4 0型轴向柱塞泵的滑履进行磨损可靠性设计。较成功地改善了摩擦副的磨损状况 ,提高了XB -F4 0型轴向柱塞泵的使用寿命 ,同时提供了一种可靠性设计的新思路。     

衢州市高耗能特种设备节能降耗的思考与探索

对当前衢州市锅炉、电梯的能耗状况及影响因数进行分析，并提出节能降耗的措施和对策。     

美军化学防护服防护因数测试用机器人最新研究进展——采用全自动多关节型机器人模型进行防护因数测试的可行性探讨

本文首先简介了美军化学防护服防护因数的现有测试方法—MIST法,然后指出了现有方法中的不足,提出了采用机器人系统—PETMAN系统替代真人进行评价试验的必要性。针对PETMAN系统的主要技术构成和相关部门要求,重点介绍了该项目研制过程中需要考虑的关键因素,并阐述了目前的研究进展。     

离子交换树脂/活性炭复合电极制备及选择性吸附性能研究

采用阴离子交换树脂和活性炭制备复合电极,探讨了影响复合电极性能的因素并测定了其实际脱盐和选择性吸附性能。结果表明,当选用矿物质活性炭,活性炭与树脂质量比为1∶3,粘结剂PVDF质量分数为10%,制备的复合电极平均电容量为92.0 F/g,对KCl溶液的脱盐率比纯活性炭电极提高了32.1%,对V(Ⅳ)、Al(Ⅲ)两种离子分离因数为29.57,分离效果显著,有较好的电化学性能和选择性吸附性能。     

Evaluation of the International Vehicle Emission （IVE） model with on-road remote sensing measurements

Intemational Vehicle Emissions （IVE） model funded by U.S. Environmental Protection Agency （USEPA） is designed to estimate emissions from motor vehicles in developing countries. In this study, the IVE model was evaluated by utilizing a dataset available from the remote sensing measurements on a large number of vehicles at five different sites in Hangzhou, China, in 2004 and 2005. Average fuel-based emission factors derived from the remote sensing measurements were compared with corresponding emission factors derived from IVE calculations for urban, hot stabilized condition. The results show a good agreement between the two methods for gasoline passenger cars＇ HC emission for all 1VE subsectors and technology classes. In the case of CO emissions, the modeled results were reasonably good, although systematically underestimate the emissions by almost 12%-50% for different technology classes. However, the model totally overestimated NOx emissions. The IVE NOx emission factors were 1.5-3.5 times of the remote sensing measured ones. The IVE model was also evaluated for light duty gasoline truck, heavy duty gasoline vehicles and motor cycles. A notable result was observed that the decrease in emissions from technology class State II to State I were overestimated by the IVE model compared to remote sensing measurements for all the three pollutants. Finally, in order to improve emission estimation, the adjusted base emission factors from local studies are strongly recommended to be used in the IVE model.