消火栓水枪喷嘴水力计算方法的简化

针对目前消火栓喷嘴水力计算采用试算及图表法所存在的问题,通过对原求解函数的优化拟合,推导出可直接计算的解析式,便于基层设计人员在实际工程设计中应用。对该解析式计算精度的分析表明,在常用参数范围内,最大拟合误差仅为1.49%,满足现行规范要求。     

基于安全性能接口的调度和管理模型研究

以云计算效能提高为目的, 以研究Job调度和资源管理两大决定云计算环境能效的最重要因素为基础, 使用调度和管理对象对作为系统统计信息的参考指标进行采集的方式展开研究。性能代理和服务接口模式(PASI)已经从云环境中采集了原始数据, 通常情况下应用于云的安全技术属于被动防御模式, 如实时动态监控或者深度包检测模式(DPI), 其主要目的是实现动态检测和防御。提出了一个有效的框架以提高云计算中心的综合性能指标, 该架构的建立是基于PASI与DPI相结合的方式, 并且提出了一个基于安全PASI的Job调度和资源管理模型(JDRMSP)。实验结果表明, 该模型有效地提升了云环境的整体运作效能。     

空间资源索引与top-k查询研究

以空间资源索引结构R-tree为基础, 考虑人们对空间资源能力指标的要求, 利用道路网络模型进行空间距离的计算, 提出了一种包含能力维度信息的空间资源索引结构和top-k查询算法, 并与传统遍历算法进行对比实验, 验证了查询算法的有效性。     

Dehydration of tetrahydrofuran by pervaporation using crosslinked PVA/PEI blend membranes

Dense blend membranes were prepared by blending hydrophilic polymers poly(vinyl alcohol) (PVA) and poly(ethyleneimine) (PEI), which were then crosslinked by glutaraldehyde (GA) in a mixture of solvents under the catalysis of hydrochloric acid (HCl) for the dehydration of tetrahydrofuran (THF) by pervaporation. The effect of experimental parameters such as feed water concentration, permeate pressure, and membrane thicknesses on permeate parameters, i.e., flux and selectivity were determined with feed water concentration less than 40 wt %. The membranes were found to have good potential for breaking the azeotrope of 94 wt % THF with a flux of 1.072 and 0.376 kg/m² h for plane PVA/PEI and crosslinked PVA/PEI blend membrane, which exhibited high selectivity of 156 and 579 respectively. Selectivity was found to improve with decreasing feed water concentration and increasing membrane thickness, whereas flux decreased correspondingly. High permeate pressure causes a reduction in both flux and selectivity. These effects were clearly elucidated with the aid of the known relationship among plasticization effect, degree of swelling, permeate pressure, and feed water concentration. These blend membranes were also subjected to sorption studies to evaluate the extent of interaction and degree of swelling in pure as well as binary feed mixtures. Further ion exchange capacity studies were carried out for all the crosslinked and uncrosslinked membranes to determine the total number of interacting groups present in the membranes. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 1152–1161, 2006     

分析用水对陶瓷铅溶出量测定的影响

分析用水水质对日用陶瓷铅溶出量测定具有重要影响,CL-、SO42-、CO2等严重抑制铅的溶出,使测定结果偏低。     

Measurement of the size, shape and orientation of convex bodies

Different types of solid bodies (particles) with specific shape and size are needed for industrial processes. For spherical particles, ‘sizer’ measurements are usually reported as sphere diameters. For non-spherical particles, particle shape and especially orientation must be taken into account. Particles of a specific shape will present different views when looked at from different directions.We have employed a Camsizer^® instrument to measure the distribution of projected area under different physical conditions for solid cylindrical particles:

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Under ‘ideal’ conditions, corresponding to a uniform distribution of particle orientation, measurements agreed with predictions. The celebrated theorem of Cauchy applies only to this case.

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For two other situations, measured and predicted results differed. However, from the experimental data it was possible to infer the particle orientations and hence theoretically predict the projected area distribution. Excellent agreement between theory and practice was then restored.

     

核壳型含氟丙烯酸酯共聚乳液

以十二烷基硫酸钠（SDS）和壬基酚聚氧乙烯基醚（OP-10）为复合乳化剂，甲基丙烯酸十二氟庚酯（Actyflon-God）、甲基丙烯酸甲酯（MMA）、丙烯酸丁酯（BA）为原料制备了壳层含氟的核壳型丙烯酸酯共聚物乳液。用红外光谱（FT—IR）表征乳胶膜化学组成，用透射电子显微镜（TEM）观察了乳胶粒的微观形态结构，并用X射线光电子能谱（XPS）进行了表面分析。发现氟有向空气与膜面迁徙的现象。通过吸水率表征含氟丙烯酸酯共聚物乳胶膜的表面性能，结果表明含氟量增加使乳胶膜吸水率大大降低。     

微生物絮凝剂产生菌HHE-P7的最佳培养条件研究

HHE-P7为从活性污泥中筛选出的一株高效絮凝剂产生菌。通过实验确定了HHE-P7最优营养成分和培养条件:葡萄糖为碳源,酵母膏作氮源,培养基初始pH=5.0,250mL三角瓶中装液量为140mL,种子接入量为培养液容积的2%,摇床温度30℃、转速150r/min。在此操作条件下培养2d后,所产微生物絮凝剂对高岭土悬液的凝絮率为97%,絮凝剂粗品产量达4.0g/L。     

纳米二氧化钛的杀菌性能测试

采用新工艺制备出具有光催化性的纳米二氧化钛。为了验证其杀菌性，以工业循环冷却水中的异养菌为实验对象进行杀菌实验，结果表明：自制纳米二氧化钛具有良好的杀菌性，杀菌率可达99．2％，而且可以回收，循环使用，产品有广阔的应用前景。     

Coal liquefaction by in-situ hydrogen generation.: 2. Zinc-water model compound reactions

Model compound studies were carried out to elucidate the reaction mechanisms taking place during the liquefaction of coal with the hydrogen produced from the reaction of zinc and water. In compounds of the type Ph-(CH₂)_n-Ph the splitting of the aliphatic bridge was easier with higher n values. Ether type compounds such as diphenylether were unreactive although the C-O bond in dibenzylether was easily cleaved. Condensed ring aromatic compounds gave low conversion with hydrogenation being facilitated by an increase in ring number. Phenolic compounds such as phenol did not react well, but the reactivity increased with increase in aromatic ring size. The cleavage of the aliphatic bridge was accelerated by the OH group, for example, in the case of 4-hydroxydiphenylmethane bond scission was about 15 times higher than that of diphenylmethane. Heterocyclic compounds were unreactive.