THE INFLUENCE OF DRAWING CONDITIONS OF PET POY ON STRUCTURE AND PROPERTY OF THE FIBER

Drawing tests upon PET POY have been made by using dynamic thermal stress analyser,which show that the dynamic thermal stress of fiber is readily affected by drawing conditions. Aseries of samples have been obtained under different drawing velocities, drawing temperatures anddraw ratios. The variations of structural factors of fiber such as the orientation, crystallinity,crystallite size and the thermal shrinkage have been measured. It is proved through experimentsthat the thermal shrinkage(Y) of the drawn fiber of PET POY is influenced by the orientation (rep-resented by sonic velocity x_1) and crystallinity (x_2) of the fiber. The quantitative relationship is es-tablished using the binary regression method: Y=10.2246+2.2030x_1-26.2670x_2 The mechanical properties such as tenacity, elongation, yield stress, initial modulus and the te-nacity at 10% elongation, etc. have also been measured. The relations between the tenacity at 10%elongation (D) and drawing velocity(V), draw ratio (DR), drawing temperature (T), and sonic ve-locity and crystallinity have been obtained using a method of mathematical statistics: D=4.594-0.009 6V , D=-8.937+7.170DR, D=2.866+0.00629T, D=-7.34+2.866x_1+6.314x_2 These equations fit well with data from the experiments. This work will be benefical to the control of quality of products and the development of newproducts.     

煤峪口矿边角煤炭资源的开采

介绍了煤峪口矿及其存在的边角煤炭资源的基本情况,分析了开采边角煤炭资源的可行性,提出了开采边角煤炭资源的具体措施。     

缺失数据下EV模型的渐近性质

在缺失响应变量的不完全数据下,考虑半参数EV模型,利用二阶段估计的方法求出了EV模型中参数β和非参数g的估计量^βn,^gn.研究了它们的强相合性及渐近正态性.     

关于复合二项风险模型的分布函数

对于复合二项风险模型,通过引入一个复合的几何分布,给出了破产前盈余及破产后赤字的联合分布函数和边际分布函数,并给出了导致破产索赔量的分布函数的具体表达式.     

电路的电磁兼容性设计

电路的电磁兼容性是指其在一个电磁环境中能正常工作的适应能力．电磁兼容性设计是提高产品可靠性的技术途径之一；提高电路的电磁兼容性有利于提高整个电子设备的可靠性．对电磁兼容的防护性设计中，滤波技术和接地技术，做了较详细的分析，根据具体情况提出抑制各种干扰及工程设计的方法。     

表面各向异性场对自旋波本征模的影响

考虑表面各向异性场,在非周期性边界条件下应用界面重参数化方法精确求解了两层铁磁耦合薄膜中的低能自旋波本征值,同时给出对应的本征模.结果表明:在A～B两层铁磁膜中自旋波本征模存在3种形式,分别为体模、界面模和禁闭模;而且表面各向异性场对本征模的表面、界面和传播性质影响很大.     

高性能混凝土高温后残余抗折强度研究

完成了127块100 mm×100 mm×515 mm混凝土棱柱体试块在20~900℃条件下的高温试验和高温后的弯折试验.以C40普通混凝土作为参照,考察了C50,C80和C100高性能混凝土棱柱体试块在火灾中的特点;通过对强度等级、外掺聚丙烯纤维和外掺矿渣与硅灰等因素的对比,分析了高性能混凝土高温后残余抗折强度与经历温度之间的相互关系;提出了高性能混凝土高温后残余抗折强度与经历温度间统计公式.     

基于ECC存在特权集的(t,n)门限群代理多重签名方案

为了解决门限群签名方案中联合攻击、伪造攻击、权限、抵赖等问题,本文基于hash函数的单向性、椭圆曲线离散对数问题的难解性,结合Shamir(t,n)门限方案,提出了一种基于ECC存在特权集的(t,n)门限群代理多重签名方案,满足((t1’,n1';t1,n1)(t2’,n2';t2,n2))门限特性.该方案利用公钥环境下交互式身份验证的方法,增加成员认证密钥,有效防止密钥管理中心和签名服务者的串通陷害;签名者通过等式验证密钥管理中心分配的秘密份额是否有效;代理授权份额的生成由原始签名者和代理签名者共同完成,单个签名的生成使用了签名者的私钥和随机数,有效防范抵赖.安全性分析表明,该方案具有抗联合攻击、强不可伪造性、门限特性和匿名性等特点,满足门限群代理签名应有的性质.     

间接可测端点可信性的拓扑条件和算法

模拟电路子网络级故障诊断理论，面临着二个基础性核心问题：（１）撕裂端点是否要全部可及，（２）子网络级故障可诊断性的条件是什么？本文给出的定理回答了这些问题．这条件是必要的和几乎充分的     

THE TRANSFER BEHAVIOUR OF SOME CATIONS AT WATER／NITROBENZENE INTERFACE BY SEMIDIFFERENTIAL CYCLIC VOLTAMMETRY

The transfer of Sr~(2+) and Ba~(2+) ion, facilitated by 18-Crown-6 present in the aqueous phase, and of succinylcholine ion at w/nb interface were investigated by semi-differential cyclic voltammetry. A good polarographic curve of succinylcholine ion dissolved in water was obtained in the system of 0.01 mol/l LiCl (w)——0.01 mol/l TBATPB (nb). The peak current is directly proportional to the concentration of SC~(2+) ion. It can be used for the determination of SC and the detection limit is 1.05×10~(-5) mol/l.The apparent D~w and D~(nb) have been estimated. The transfer of Sr~(2+) and of Ba~(2+) at the interface are facilitated by 18-Crown-6 present in the aqueous phase and the peak current is directly proportional to the concentration of 18-Crown-6 in water. This method can be used for the determination of the complexing agent and for the stability constant of the complex formed in the aqueous phase.All the experimental results are in keeping with the theoretical.