BEHAVIOUR OF INHIBITORS IN EMULSION POLYMERIZATION(Ⅱ)CaseⅠKinetics

The behaviour of water soluble and monomer soluble inhibitors in the emulsion polymerization for CaseI system(e.g.vinyl acetate and vinyl chloride)has been studied.The behaviour of monomer soluble inhibitorsis shown to be quite different from that observed in Case Ⅱ emulsion polymerization system.Model predictionsof the effect of these inhibitors on polymer particle nucleation and growth rate are shown to be in satisfactoryagreement with experimental results.

紫外线对离子互补型自组装寡肽EAK16-II聚集状态的影响

借助原子力显微镜对离子互补型自组装寡肽EAK16-II在水溶液中自组装聚集形态受紫外线的影响进行了研究.研究结果表明,紫外线改变了该类寡肽在水溶液中自组装形成的纳米结构.当用波长为365 nm的紫外线照射2 h后,离子互补型自组装寡肽的聚集态从纤维状结构转变为球形结构.从成核模型分析,其原因是由于紫外线照射导致了自组装聚集体分子间作用力的破坏以及β片层向β转角的转变.

某些正交群的特征性质

记π_e(G)为群G中元的阶之集。证明了如下定理: 定理1 设G是有限群,M∈|O_8(2),O_(10)(2)|。则G≌M当且仅当π_e(G)=π_e(M)。即h(π_e(M))=1,其中h(Γ)是满足条件π_e(G)=Γ的群G的同构类类数。 定理2 设G是有限群,M∈|O_7(2),O_8^+(2),O_7(3),O_8^+(3)|。若π_e(G)=π_e(O_7(2))=π_e(O_8^+(2)),则G≌O_7(2)或O_8^-(2)。若π_e(G)=π_e(O_7(3))=π_e(O_8^+(3)),则G≌O_7(3)或O_8^-(3)。即此时h(π_e(M))=2。

三维运动接触问题的广义Галин定理

本文给出了求解一类相当普遍的三维运动接触问题的分析解法,并且把仅仅对静态接触问题成立的 定理推广到动力学情形,作了严格证明。作为例子,对接触区为椭圆的情形给出了积分形式的解,并且作了数值计算,由这些结果可以看出运动压体速度的效应。

THREE-DIMENSIONAL ISODYNE STRESS ANALYSIS——PRESENT STATE, TRENDS, THEORETICAL PROBLEMS

The paper presents and discusses theoretical bases and methodology of development of two- and three-dimensional analytical and optical isodynes. Atten- tion is given to the theoretical admissibility of the major components of the physical and mathematical models which are taken as the theoretical basis of the isodynes, and of the related analytical and experimental procedures of stress analysis. Efficiency and reliability of the nondestructive isodyne stress analysis are discussed.