有限元并行计算自动分区方法的优化

针对集群系统下动力学问题的大规模显式有限元并行计算的特点,在对多层次谱二分分区方法各个阶段的算法进行分析和试验的基础上,对其相关阶段的分区策略和算法进行了优化和调整,提出了一种多层次谱二分优化分区方法,并应用该方法对不同几何类型的有限元模型进行了分区测试,得到了满意的结果．与多层次谱二分分区方法相比,多层次谱二分优化分区方法的分区效果和分区效率都得到了明显改善．     

产品设计中的虚空间研究

目的提出产品设计中的虚空间概念,为设计师提供一个认识产品设计的全新角度,以帮助设计师更好的开发产品。方法以产品虚空间为研究对象,通过分析产品设计中虚空间的概念、存在形式和设计意义,提出虚空间的4种设计方法,即空间分割法、空间加减法、空间共享法与空间借用法。结论设计师在进行产品设计时应重视虚空间概念,以虚空间为研究对象,通过设计其他事物间接完成对虚空间的功能设计。     

基于点索引的网格模型的层次结构

针对稠密采样的网格模型．提出一种基于面片中心点索引的新的场景BSP树结构．与常规RSP树构造方式不同,文中RSP树以面片中心点位置作为场景中各面片二叉分类的依据,避免了常规BSP树构造方法中因分割与削分平面相交的面片引起的场景复杂度的增加,大大简化了BSP树的构造过程．实验结果表明：对稠密网格场景,文中的BSP树比常规方式构造的BSP树任加速光线跟踪算法中的求交测试具有明显的优势．     

卫星舱布局CAD系统:Pro/Engineer二次开发若干关键技术

以简化的国际商业通信卫星（INTELSAT-Ⅲ）舱内布局设计为背景,探讨基于Pro/Engineer二次开发的该CAD系统若干关键技术.包括开发版本和模式的选择、应用程序的界面定制和流程控制、布局子空间的定义与划分、自动装配定位技术的实现以及Pro/Engineer软件中各功能模块的外包利用等.上述二次开发技术经该布局系统验证,有助于Pro/Engineer二次开发过程的研究与应用.     

磷酸三丁酯络合萃取煤气化废水中的酚

研究了磷酸三丁酯（TBP）-正辛醇萃取煤气化废水中的酚。实验考察了TBP浓度、温度对萃取过程中分配系数的影响规律,确定了萃取产物的结构组成及反应焓变,通过液液萃取模型理论建立了TBP萃取酚的分配系数模型,且以煤气化废水为实验水样验证了分配系数模型的准确性。结果表明：TBP浓度越大,萃取分配系数越大,当TBP体积分数由10%增至50%时,萃取分配系数由17.6增至61.4;温度升高,萃取分配系数降低,温度由30℃升至70℃时,萃取分配系数由42.9降至34.7;TBP浓度对萃取分配系数模型有影响,且平均相对误差控制在1.14%;温度对萃取分配系数模型有影响,且平均相对误差控制在0.87%。通过模型预估及实际实验值的对比,该萃取分配系数模型在预测煤气化废水萃取分配系数上具有较高的可信度。     

Effect of surface active additives on partitioning of proteins and enzymes in poly(ethylene glycol)/dextran aqueous two-phase systems

The effect of anionic (sodium butylbenzene sulfonate, sodium butylmonoglycol sulfate), cationic (tetrabutyl ammonium bromide), nonionic(Tween 20) and amphoteric (proline) surface active additives on the partitioning of proteins and enzymes, such as BSA, lysozyme, glucose oxidase and β-lactoglobulin, in a bipolymeric aqueous two-phase system of polyethylene glycol and dextran has been studied. The partitioning of proteins and enzymes in the aqueous two-phase system is influenced by surface active additives depending upon their structure and charge. The amphiphiles themselves partition unevenly between the two phases. Their effect on protein partitioning can be explained on the basis of electrostatic and hydrophobic interactions. In the presence of ionic amphiphiles, proteins have an affinity for the other phase if an amphiphile carrying a charge of the same sign partitions to that phase. The hydrophobic effect contributes to protein partitioning if the proteins have significant members of surface hydrophobic amino acid residues. © 1998 Society of Chemical Industry     

Effects of water solubility of acrylonitrile on vinylidene chloride/acrylonitrile/styrene suspension polymerization

The water solubility of acrylonitrile (AN) and its effects on vinylidene chloride/acrylonitrile/styrene (VDC/AN/St) suspension copolymerization were investigated in this study. It shows that the VDC/St ratio and the presence of suspending agent have no obvious influences on AN phase partition between the monomer and aqueous phases, whereas the water solubility of AN increases as temperature increases. Polymerization in the aqueous phase occurs extensively with azobis(isobutyronitrile) (AIBN) as initiator, whereas with lauryl peroxide (LPO) as initiator, polymerization in the aqueous phase is negligible. Theoretical analysis and experimental results indicate that transport of the monomer molecule is possible during polymerization. Both VDC and AN transfer from the monomer phase to the aqueous phase when AIBN is used as initiator. AN transfers from the aqueous phase to the monomer phase for the polymerization system initiated by LPO. Sodium nitrite (NaNO₂), but not sodium sulfide (Na₂S), can be used to effectively inhibit polymerization in water and exerts less influence on the polymerization in the monomer phase. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 79: 1431–1438, 2001     

Enhanced high-order information extraction for multiphase batch process fault monitoring

Conventional independent component analysis (ICA) monitoring methods extract the feature information of process data by selecting more important independent components (ICs), which discard a small part of ICs that may contain useful information for faults, leading to unsatisfactory monitoring results. However, when the number of sampling points is greater than that of process variables, the ICA monitoring model does not work well. To address the aforementioned problems, a novel monitoring method, multiphase enhanced high-order information extraction (MEHOIE), is proposed in this paper. The entire production process was first divided into several steady phases and transition phases by the affinity propagation (AP) phase partitioning method. The enhanced high-order information extraction (EHOIE) model was then built in each phase for fault monitoring. Finally, the algorithm was applied in the penicillin simulation platform and industrial microbial pharmaceutical process. The flexibility and superiority of this algorithm were verified by comparing it with other conventional methods.     

基于树形分布的电压控制分区

从改善电压质量和减少网损考虑,无功功率应尽力避免远距离输送,尽量做到就地平衡。为此对电力系统无功／电压分级分布式优化控制模式下的电力系统分区方法进行了研究,提出了一种基于树形分布的电压控制分区方法。在形成反映系统各节点分布的电气距离特性的树形分布表基础上利用专家系统按照各区域的不同要求进行区域划分和调整优化。保证了系统分区结果的合理性与目的性。     

基于裕度因子的多风电场站集群频率协调控制策略

为提升高比例电力电子装备电力系统的涉网频率性能,提出了一种基于裕度因子的多风电场站集群频率协调控制方法。对于多风电场站集群系统一次调频功率的分配问题,综合考虑转子转速及变流器容量运行条件后,利用等比例裕度因子的一次调频功率分配方法,将有功功率指令下发给各风电场站。针对各风电场站中虚拟惯量、虚拟阻尼系数的制定问题,研究了一种基于可释放动能的频率调节参数分区设置方法。将各风电场站运行状态通过频率响应的变化趋势进行分区,并在此基础上结合可用调频动能对频率调节参数进行合理灵活的设置。仿真结果表明所提方法充分利用了各风电场站的调频资源,提高了高比例电力电子装备电力系统的频率稳定性,为新型电力系统的频率安全性提供了相应的技术保障。