级数绝对收敛与条件收敛的审敛法研究

由正项级数∞∑n=1 ｜un｜发散一般不能推出级数∞∑n=1 un发散。但是如果正项级数∞∑n=1 ｜un｜的发散性是由比值审敛法或根值审敛法所确定，则原级数∞∑n=1 un必然发散．     

正二十面体、正十二面体研究的历史演进

通过论述柏拉图(Plato,B.C.427-B.C.347)、欧几里得(Euclid,约B.C.330-B.C.275)、帕波斯(Pappus,约300-350)、帕赛利(L.Pacioli,约1445-1517)、梅文鼎(1633-1721)作正二十面体、正十二面体的作图法,指出梅氏作法最为简洁,已蕴含证明,胜于上世纪苏联别列标尔金(Д.И.Перепелкин)方法,为历来最优美解.     

关于拓扑对策中的I~2(K)I(K)问题

证明了如果空间类κ为D-空间类或闭遗传不可约空间类,则I(κ)(∈)κ.这一结果对于κ为D空间类和闭遗传不可约空间类,肯定地回答了I(κ)是否包含I2(κ)问题.     

SHORT COMMUNICATION SECTION Some Geometric Flows on Kahler Manifolds

We define a kind of KdV （Korteweg-de Vries） geometric flow for maps from a real line or a circle into a Kahler manifold （N,J,h） with complex structure J and metric h as the generalization of the vortex filament dynamics from a real line or a circle. By using the geometric analysis, the existence of the Cauchy problems of the KdV geometric flows will be investigated in this note.     

中国移动通信市场的利润博弈研究

根据斯塔尔博格博弈原理,研究中国移动通信市场的营销策略,结果表明在多寡头垄断情况下,通过价格战争取客户,在用户数量达到最优,企业不能取得最大利润.只有通过准确的商业战略来指导投资方向,创建可行的商业模式,通过服务差异化等策略才能实现市场的有效竞争.     

Combined effect of modified zeolite 13X and β-nucleating agent on improving β-crystal content and toughening polypropylene random copolymer

Although addition of β-NUCLEATING agent directly into homo-polypropylene(PPH) is a useful method to improve β-CRYSTAL content and toughen PPH, polypropylene random copolymer(PPR) makes this method powerless due to its random structure and low crystallinity. In this study, the-nucleated PPR with high β-CRYSTAL content was prepared by a novel high effective β-NUCLEATING system which consists of-nucleation agent(TMB-5) and modified zeolite 13X(M13X). It was found that M13X and TMB-5 had a synergistic influence on improving β-CRYSTAL content and toughening PPR. The content of β-CRYSTAL in PPR/M13X/TMB-5 was significantly larger than the sum of that in PPR/M13X and PPR/TMB-5. Besides,fracture behavior, phase morphology and relaxation of matrix chain segments were also investigated. The results showed that M13X and TMB-5 improved the mobility of amorphous chain segments at low temperature and contributed to much energy dissipation. This work provides a powerful method to modify PPR.     

石墨炉原子吸收光谱法测定铅和铜中记忆效应的消除

对石墨炉原子吸收光谱法测定Pb和Cu中 ,不同构形的石墨管存在的记忆效应问题进行了探索研究,并对石墨管采取改进措施,取得了良好的效果,有效地消除了记忆效应。     

Taylor公式在判断级数敛散性时的应用

在一些证明级数敛散性的问题中，Taylor公式的应用有时能起到关键作用．通过实例说明如何运用这一思想，讨论级数的敛散性问题．     

Dual-parameter Correlation Analysis of the Fluorescence Data of 1-Methyl-2-formyl-5-substituted Pyrrole(4-nitrophenyl)hydrazones

effect、pohrencct．l－methyl－2－formvl－5－Y－substitutedpyrrole（4－nltrophenyl）Ndrazones．Correlationresultsmrthefluorescencespectraldataofsubstitutedstyrenesanda－Onthebasisof＊themagnitudesofevaluatedlpm。／p、。”］valuesofEq．l，Inwhichp”a“（orPn。。／an，。）andPa（orP。』／a。。）rePresentthePolarandsPin－delocallzatloneffect，wehaverecentlyproposedthattherearefourcategoriesofpossiblecircumstancesforcorrelationanalysisofradlcalreactlvltlesandspectralpropeTtlesl．IBothpolarandsp…     

THE STABILITY OF THE θ-METHODS FOR DELAYDIFFERENTIAL EQUATIONS

1.Introduction1.1.Thethree0-methodsWedealwiththenumericalsolutionoftheinitialvalueproblem:Heref,no!TdenotegivenfunctionswithT(t)5t,whereasu(t)isunknown(fort>to)'Withtheso--calledone--leg0--method,linear0--methodandnew0--method,onecancomputeapproximat...