样本函数条件极值的渐近性质

讨论了形如ψ(x,Gnk(x|y))的样本函数极值特性,其中Gnk(x|y)是G(x|y)第k个最近邻域(k-NN) 的估计,得出在常规条件下存在某一Gaussian过程,使得收敛于这一Gaussian过程。     

修正的Navier—Stokes方程的再生性质和周期解

本文证明了由提出的修正的Navier-Stokes方程在小外力的条件下对t_1∈(0,T]存在唯一的初始速度分布使得相应的初边值问题的广义解具再生性质:(t_1)=(0)=.从而当外力还是时间t的周期函数时,是周期解.进而证明此周期解以指数方式吸引相应于同一外力但初值可任意的其它解.上述结论的证明基于对广义解v的导数v在空间L~∞(0,T;L~2(Ω))中估计.     

基于3S技术的土地利用动态变化研究

3S技术是研究土地利用动态变化的重要技术手段，具有传统方法无法比拟的优越性。本文以秦皇岛市为例，定量分析了区域内土地利用动态变化。针对区域土地利用程度及生态环境可能产生的影响进行了简要的评价，揭示了研究区土地利用变化规律，为秦皇岛市实现生态环境目标提供决策依据。     

凡勃伦与马克思制度经济学思想比较

从理论来源、分析方法等方面比较了凡勃伦与马克思制度经济思想，指出二者虽然在理论来源、分析方法等方面有较大的区别，但也有一些相互融通的地方，同时，马克思经济思想给早期的制度经济学的发展开辟了更广的出路与领域。     

城市房屋拆迁中产权问题的思考

本文针对目前我国城市房屋拆迁问题，通过对城市房屋拆迁过程涉及的权利内容进行了总结，并在此基础上，着重分析了城市房屋拆迁过程中权利保护的有关问题，提出了在城市房屋拆迁过程中，房屋产权要高于拆迁权的思想基础，期望通过本文分析达到抛砖引玉的作用，为今后加强对城市房屋拆迁管理，进一步完善我国城市房屋拆迁制度提供一个更为深入的研究路线。     

不同结构N-取代硫代吖啶酮光敏性能的研究

采用乌尔曼反应、酸催化环化、N-烷基化和硫代化四步反应路线合成了5种不同结构的N-取代硫代吖啶酮,利用IR和MS分析手段表征了其结构,UV分光光度计的测定结果表明5种硫代吖啶酮在可见光区都有较强的吸收。其中N-丙基硫代吖啶酮的吸收波长为490nm,与氩离子激光的主发射波长相匹配。由硫代吖啶酮、二苯基碘鎓盐和活化剂组成的共引发体系使光聚合涂层的感度大大提高     

关于高等教育产业化若干争议的辨析

高等教育产业化问题引起了较大的争议。对争议中的高等教育市场化、．企业化的若干问题，作了针对性的辨析。     

论我国民间器乐曲中常用的旋律发展手法

传统民族器乐中有着丰富而多样的旋律发展手法,长期以来形成了一套独特的规律,从目前所掌握的资料与音响中,总结分析了民族器乐中带有普遍意义的有关旋律发展技法,并将其归类为重复、联缀、循环、变奏、展衍五种技法.     

Using genetically-defined rodent strains for the identification of hippocampal traits relevant for two-way avoidance behavior: a non-invasive approach

Summary Genetically-defined rodent strains permit the identification of hippocampal traits which are of functional relevance for the performance of two-way avoidance behavior. This is exemplified here by analyzing the relationship between infrapyramidal mossy fibers (a tiny projection terminating upon the basal dendrites of hippocampal pyramidal neurons) and two-way avoidance learning in about 800 animals. The necessary steps include 1) identification of structural traits sensitive to selective breeding for extremes in two-way avoidance, 2) testing the robustness of the associations found by studying individual and genetical correlations between hippocampal traits and behavior, 3) establishing causal relationships by Mendelian crossing of strains with extreme structural traits and studying the behavioral consequences of such structural randomization, 4) confirming causal relationships by manipulating the structural variable in inbred (isogenic) strains, thereby eliminating the possibility of genetic linkage, and 5) ruling out the possibility of spurious associations by studying the correlations between the hippocampal trait and other behaviors known to depend on hippocampal functioning.In comparison with the classical lesion approach for identifying relationships between brain and behavior, the present procedure appears to be superior in two aspects: it is non-invasive, and it focuses automatically on those brain traits which are used by natural selection to shape behaviorally-defined animal populations, i.e., it reveals the natural regulators of behavior.     

WHOLLY-AROMATIC COPOLYESTERS CONTAINING IPA, 2.6-NDA, TPA, CLHQA AND PABA MONOMERS

The crystallinities, thermal properties, liquid crystal properties and rheologic properties oftwo series of the aromatic copolyesters are studied. One of them is composed of IPA, 2,6-NDA,CLHQA, PABA and. the other composed of TPA, 2.6-NDA, CLHQA, IPA. The results showthat the crystallinities of the aromatic copolyesters are relatively low and the melting point of thecopolyesters decreases with an increase of the unsymmetrical contents. These two series of aro-matic copolyesters are both suitable for the conventional melt spinning process and have a goodfiber forming property and a good thermal stability. The viscosities of aromatic copolyestermelts are greatly affected by the shear rate, hence the so-called" thinning under shearing" phe-nomenon. The melts have a rather high viscosity flow activation energy and a relatively lowelasticity.