A FUNCTIONAL CENTRAL LIMIT THEOREMFOR NEGATIVELY ASSOCIATED SEQUENCE

Let(x1,j≥1)be a sequence of negatively associated random variables with ex1=o,ex^21＜∞.in this paper a functional central limit theorem for negatively associated random variables under some conditions withbout stationarity is proved which is the same as the results for positively associated random variables.     

顺式二氯二氨合铂与核苷作用的13C核磁共振研究

本文用¹³C NMR法系统研究了溶液中顺式二氯二氨合铂与胸苷、胞苷、鸟苷和5'-腺嘌呤单核苷酸的作用,确定了不同条件下形成配合物的组成及其分子申铂原子与配体的成键方式。在中性介质中顺铂分别与胸苷、胞苷作用,生成N₃配位的顺-[Pt(NH₃)₂(ThyH_-1)₂]和顺-[Pt(NH₃)₂(Cyt)₂]²⁺;与鸟苷随摩尔比不同相应生成顺-[Pt(NH₃)₂(N₂-Guo)₂]²⁺和[Pt(NH₃)₂(N₂,N₁-GuoH_-1)]_nⁿ⁺,当pH=3和摩尔比为1时,尚有微量[Pt(NH₃)₂(N₇,O(C₆)Guo)]²⁺生成;在中性介质中顺铂与5'-AMP亦随摩尔比不同,生成顺-[Pt(NH₃)₂(N₇-5'-AMP)₂]^2-或兼生成顺-[Pt(NH₃)₂(N₇,N₁-5'-AMP)]_n。根据所得结果讨论了顺铂抗癌作用机制,提出了顺铂可能与DNA同一链上相邻二个鸟嘌呤基上的N₇N₁键合形成链内交联的新机制。     

两参数分数Wiener过程增量的一般形式

§1Introductionandresults A2-parameterGaussianprocess{Z(t,s);t,s≥0}iacalleda2-parameterfractional Wienerprocesswithorderα(0<α<1),ifZ(0,0)=0a.s.EZ(s,t)=0anditscovariance EZ(t1,s1)Z(t2,s2)={|t1|2α+|t2|2α-|t2-t1|2α}{|s1|2α+|s2|2α-|s2-s1|2α}/4.LetR=[x1,x2]×[y1,y2],DT={(x,y)∶0≤x,y≤bT,xy≤T}.Let0相似文献   

RIEMANN BOUNDARY VALUE PROBLEM WITH RESPECT TO THE PERTURBATION OF BOUNDARY CURVE TO BE AN OPEN ARC

By dint of the stability of Cauchy-type integral with kernel density of class H＊ for an open arc, this paper discusses the stability of the solution of Riemann boundary value problem with respect to the perturbation of boundary curve to be an open arc.     

A new flavanone glucoside from <Emphasis Type="Italic">Abrus precatorius</Emphasis>

A new flavanone glycoside, (2S)5,7,4′-trihydroxyflavanone-8-C-β-D-(6″-O-acetyl)glucopyranoside (1), together with six known flavonoids, isohemiphloin (2), vitexin (3), cirsimaritin (4), hispidulin (5), apigenin (6), and eupatorin (7), was isolated from the leaves and stems of Abrus precatorius. Their structures were elucidated on the basis of physical and spectral analysis. Rotamers exist for compounds 1, 2, and 3. Compounds 1–3, 6, and 7 were isolated from this plant for the first time.     

ON LOCAL CONTINUITY MODULI FOR GAUSSIAN PROCESSES

ＬＵＣＨＵＡＮＲＯＮＧ（陆传荣）（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓ，ＨａｎｇｚｈｏｕＵｎｉｖｅｒｓｉｔｙ，Ｈａｎｇｚｈｏｕ３１００２８，Ｃｈｉｎａ）（ＴｈｉｓｗｏｒｋｉｓｓｕｐｐｏｒｔｅｄｂｙｔｈｅＮａｔｉｏｎａｌＮａｔｕｒａｌＳｃｉｅ...     

Synthesis and solution behavior of comb‐like terpolymers with poly(ethylene oxide) macromonomer

A novel macromonomer: p‐vinylbenzyl‐terminated octylphenoxy poly(ethylene oxide) (polymerization number: 18) (VBPEO) was synthesized. The comb‐like acrylamide‐based terpolymers (PVEA) were synthesized by aqueous free‐radical copolymerization technique using acrylamide (AM), VBPEO and sodium 2‐acrylamido‐2‐methylpropane sulphonate (NaAMPS). The macromonomer and PVEA polymer were characterized with Fourier transform infrared (FTIR) spectroscopy and proton nuclear magnetic resonance (¹H NMR). The polymers exhibited self‐assembly behavior in water and the brine solutions. The polymers could be employed in the oil reservoirs of either the high or medium to low permeability due to the low intrinsic viscosities. The optimum NaAMPS feed amount could not only increase the water solubility, but also facilitate the intermolecular associations. Implementing VBPEO into the polymer greatly increased the rigidity of molecular chains, resulting in a high apparent viscosity of the PVEA in water and the brine solutions. The PVEA brine solutions exhibited both excellent uni‐ and bi‐valent cation resistance, salt‐ and heat‐thickening twice, pseudoplastic behavior, and thixotropy. The SEM morphologies showed that the expanded polymer bundles as well as the associated structures with huge sizes were formed for PVEA in water and that the continuous network structures were still formed in the PVEA brine solutions. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48: 1241–1250, 2010     

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).     

具收获项的Ⅱ类功能反应的捕食系统的定性分析

在文[7][8]的基础上,分析了一类食饵具常数收获项的Ⅱ类功能反应的捕食系统,通过对鞍点分界线相互位置仔细的分析,得到了比较完备的定性结论,特别是第一次在生态系统的讨论中得到了三个极限环的存在性。     

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.