基于预应力法的转子临界转速研究

 以ANSYS软件作为平台，用预应力法求解了转子的临界转速. 对 计算过程作了定性分析，推导了计算公式. 对计算的结果和自编有限 元程序得出的结果作了比较，精度较高.对于多跨转子与其每一单跨 转子临界转速之间的关系，作了阐述.     

在模态分析中如何分析,消除结构参数变化带来的影响

本文提供了在实验模态分析中消除附加质量、刚度和阻尼对复模态参数影响的方法。此外,作者将上述方法予以发展,使它适用于阻尼结构修改后的振动再分析,文中附有数字例题,其结果表明了方法的有效性。     

α－混合随机场的弱收敛

本文把Ｈｅｒｒｎｄｏｒｆ（１９８５）关于α－混合序列弱收敛的一个一般的充分条件拓广于α－混合随机场｛Ｘ＿ｔ，ｔ∈Ｚ￣ｄ｝，给出了｛Ｘ＿ｔ｝的部分和弱收敛于标准Ｂｒｏｗｎ单的一个充分条件，包含了现有的许多结果．     

相依随机变量不变原理的收敛速度的注

在本文中,我们讨论了相依随机变量的弱不变原理的收敛速度,改进了Utev(1984)等人的结果,那里平稳性的假设被去掉了且减弱了?混合的速度为叫n)=U(n-"yea/vm-ay (OGE< 3).     

反式二氯二氨合铂与核苷作用的13C核磁共振研究

本文用¹³C核磁共振法研究了反式二氯二氨合铂和胸苷、胞苷、鸟苷和5'-腺苷酸的作用,确定在中性介质中所生成配合物状态及其中铂与配体的健合形式,在此基础上讨论了顺、反式二氯二氨合铂具有不同抗癌行为的可能原因。     

在丙酮溶液中18-冠-6与CoCl2配位化合物的NMR研究

本文研究了丙酮溶液中配合物的平衡和结构。建立了一套计算机程序。通过化学位移数值的分析说明在溶液中主要存在两种平衡,并确定了平衡常数k₁₁=2.95×10²l/mol,k₁6.1l/mol以及冠醚络合物的极限化学位移D₁₁^(H)=350Hz,D₁₁^(C)=-290Hz,D₂^(H)=1300Hz,D^(C)=-1600Hz。确认位移机制是电子磁矩和共振核的核磁矩通过空间直接偶极-偶极相互作用。     

独立与m相依变量组列的弱收敛

本文给出了独立随机变量组列所产生的部分和过程弱收敛于Brown运动过程的充要条件的一个直接证明,并运用这一结果对m相依情形给出了一个充分条件。前者推广了Billingsley及Loeve提到的Donsker及Lecam的定理,后者改进了Orey有关m相依情形的结果。     

The role of folic acid in inducing of apoptosis by zinc(II) complex in ovary and cervix cancer cells

Molecular Diversity - Herein, the synthesis, structure, binding affinity, cytotoxicity, and apoptotic properties of the new Zn(II) complex composed of folic acid and bipyridine ligands are...     

Effects of Monomer Feed Amounts on Solution Properties and Solution Morphologies for a Comb-like Ter-polymer

An acrylamide(AM)-based ter-polymer (PAAB) containing sodium 2-acrylamido-2-methylpropane sulphonate (NaAMPS) and p-vinylbenzyl-terminated octylphenoxy poly(ethylene oxide) (VBE, polymerization degree: 24) was synthesized by an aqueous free-radical copolymerization. In order to obtain a PAAB polymer with both good thickening properties and surface and interfacial properties in brine solutions for enhanced oil recovery (EOR), the influences of the NaAMPS and VBE feed amounts on the intrinsic and apparent viscosities and the surface and interfacial tensions of the PAAB polymer in aqueous solutions were investigated. The optimum NaAMPS feed amount was 9 mol%; an excessive feed amount interfered with the aggregations of the PAAB macro-molecules in aqueous solutions and on the surfaces of aqueous solutions and the interfaces between aqueous solutions and kerosene. In addition, for this NaAMPS feed concentration, the PAAB polymer showed the highest apparent viscosities and the lowest surface and interfacial tensions in 5 g L^?1 NaCl for a VBE feed amount of 1.1 mol%. The mechanism giving rise to the solution properties for this polymer was examined. For this purpose, the effect of the polymer concentration on the supra-molecular structures of the PAAB polymer in water and in 5 g/L NaCl, were investigated by ultraviolet spectral analysis using pyrene as a probe. A transmission electron microscope (TEM) was also used to observe the morphologies of the associated structures in aqueous solutions to explore the correlation between the solution properties and solution structures for PAAB; expanded polymer chain bundles were formed at a polymer concentration of 0. 4 g L^?1, higher than the critical micelle concentration (0. 3 g L^?1).     

线性模型误差方差估计的精确极限性质

本文讨论线性模型Yi=Xi1β ei,i=1,2,…,n,其中{ei,i=1,2,…,n)为零均值方差有限 的独立同分布随机变量序列,分别证明了模型的误差方差估计的LLN和LIL精确极限性质.