Product and process parameters determination for quality and cost

The purpose of this study is to conduct a concurrent product and process parameters determination for further cost reduction and quality enhancement. The process design-related parameters, such as process mean, process tolerance and product design-related parameters, such as product tolerance, are considered simultaneously in the proposed approach. To reflect the response from these three key controllable characteristics: process mean, process tolerance and product tolerance, the key measurement score, which is the sum of the mean cost, tolerance cost, quality loss and failure cost, is used to evaluate the present model. Two examples are provided for demonstrating the application of single and multiple quality characteristics.     

法规--化学品发展的瓶颈与机遇

介绍了近年来欧盟、日本、美国和中国化学品法规的变化，欧盟有关生物降解性的规定被扩展到包括所有种类和类型的清洁用表面活性剂；日本政府将修订《化学物质控制法》，生态毒理学评价手段和危害性评价概念将被更新；在中国，由中国洗涤用品工业协会牵头的“全国表面活性剂洗涤用品标准化技术委员会”即将成立。     

锦纶6POY含油率对DTY加工性能的影响

探讨锦纶 6POY油剂特性 ,并用相关理论分析了 POY含油率对 DTY加工的影响。结果表明 :只有当 POY含油率适中时 ,才能有效控制 DTY加工中的“雪花”量 ,减少 DTY断头率且 POY含油率与上油均匀性均对 DTY质量有一定的影响 ;用 F -5 82油剂生产 90 dtex/2 4f锦纶 6POY的最佳上油条件为含油率 0 .45 %± 0 .0 5 %。     

物理防晒剂配方应用

指出了防晒对人体的重要性，并给出了防晒产品提高效能的依据。重点讨论了如何使用TIOVEIL和SPECTRAVEIL分散液来取得最佳的效能，在达到最高的SPF值和UVA防护的同时保证最终产品的稳定和雅致外观。同时还给出了物理防晒产品TIOVEIL和SPECTRAVEIL的配方指导。     

聚丙烯球形高效催化剂的工业应用研究

介绍了DQ-2型球形高效催化剂在间歇式液相本体法聚丙烯生产装置上进行工业应用的试验研究，试验证明，该催化剂具有节水、节电、反应平稳且操作时间短等聚合反应特性，催化剂活性平均为42kgPP／(gCat)，一级品率达90％，并与非球型高效催化剂进行了比较。     

游戏产品有效粘合用户时间的策略研究

通过对游戏的分类、发展历程梳理以及用户的需求分析,结合游戏产生过程给出了游戏产品有效粘合用户时间的策略,最后预测了游戏的发展趋势。     

Enzymatic esterification of glycerol II. Lipase-catalyzed synthesis of regioisomerically pure 1(3)-rac-monoacylglycerols

Regioisomerically pure 1(3)-rac-monoacylglycerols are conveniently prepared in high yields (>75%) and in multigram quantities by enzymatic esterification of glycerol in the presence of various lipases(Chromobacterium viscosum, Rhizopus delemar, Rhizomucor miehei) with a variety of different acyl donors, such as free fatty acids, fatty acid alkyl esters, vinyl esters and triacylglycerols, as well as natural fats and oils. All reactions are carried out in aprotic organic solvents with low water content, namelyn-hexane, diethyl ether, tBuOMe or mixtures of these solvents. Essential for the success of these transformations were the following two factors. First, the creation of an artificial interphase between the solvent-immiscible hydrophilic glycerol and the hydrophobic reaction medium by its adsorption onto a solid support. Second, a facile system for the separation of the desired monoacylglycerol from the reaction mixture, coupled with the continuous recycling of acyl donor and undesirable by-products.     

同时发生初次和二次成核且为聚结控制的沉淀过程多定态及稳定性分析

The possibility of multiplicity in an isothermal continuous mixed suspension-mixed product removal crystallizer is explored using the bifurcation theory.A process involving agglomeration controlled precipitation is considered in which secondary nucleation occurs simultaneously with primary nucleation.The determinant equations for the existence of multiple steady states are developed and the multiplicity boundaries dependent on the physical and kinetic properties and operational parameters of the process are obtained by resolving these determinant equations.The number of steady states in the precipitator for various multiplicity regions is determined and the linear stability of these steady states is analyzed by using the Routh criterion.     

玻璃钢件固化成型中变形现象的剖析

结合实例剖析由产品结构、成型工艺和工艺装备等主要因素影响的复合夹层结构玻璃钢件和实体玻璃钢件在固化成型中的变形现象，并指出了预防变形的各相应有效措施。