具有Sturm-Liouville边界条件的四阶奇异微分方程正解的存在性

利用极值原理和上下解方法给出了具有Sturm-Liouville边界条件的四阶奇异微分方程C2[0,1]和C3[0,1]正解的存在性,允许非线性项f(t,u)在u=0和t=0,1处可以是奇异的。     

钌配合物[Ru(phen)2(7-R-dppz)]2+( R=-CH3,-F,-CF3)的合成、表征及DNA键合性质

合成并表征了三个钌(II)多吡啶配合物[Ru(phen)2(7-CH3-dppz)]2+ (i)、[Ru(phen)2(7-F-dppz)]2+ (ii)和 [Ru(phen)2(7-CF3-dppz)]2+ (iii).利用光谱法和粘度实验研究了配合物与DNA的结合行为.结果表明3个配合物均以插入方式与DNA结合,其与DNA的亲和力顺序为(ii) > (i) > (iii).同时采用密度泛函(DFT)理论计算合理解释了3个配合物与DNA结合行为的差异.     

乡村治道变革：从单中心秩序到多中心秩序

新中国成立后，我国政府在广大乡村地区建立起基层政权，形成了一种单中心秩序。这种单中心秩序在人民公社时期得到了极大地强化。改革开放后，“乡政村治”的乡村治理结构的确立，对单中心秩序带来了一定程度地冲击，但未能根本动摇。建设社会主义新农村时期，我国乡村治道需要进行一次深刻的变革，从单中心秩序走向多中心秩序，实现乡村社会的善治。     

Atomic packing and short-to-medium range order evolution of Zr-Pd metallic glass

A larger-scale Zr₇₀Pd₃₀ alloy system has been simulated using molecular dynamics (MD) to investigate structure evolution in Zr₇₀Pd₃₀ metallic glass. The simulated pair distribution function of Zr₇₀Pd₃₀ metallic glass agrees well with the experimental results. Voronoi polyhedron analysis indicates that the icosahedra are not randomly distributed in space, but form characteristic intercrossed icosahedral clusters with medium-range order. Intercrossed icosahedral clusters are the dominant local configurations in Zr₇₀Pd₃₀ metallic glass and probably cause the quasicrystalline phase discovered in Zr₇₀Pd₃₀ metallic glass.     

A revision of the Asian and European species in the subgenus Amiota Loew (Diptera,Drosophilidae) and the establishment of species-groups based on phylogenetic analysis

A total of 53 Amiota (s. str.) species (75% of the world total) from Asia and Europe, including 10 new species, kamui, kimurai and planata from Japan, and aristata, cuii, macai, magniflava, nuerhachii, spinata and watabei from China, are reviewed with designation of two new synonymies and phylogenetic analysis. Based upon the result of cladistic analysis with 31 adult male morphological characters, the following conclusions are deduced: (1) The subgenus Amiota is monophyletic, so far as the Asian and European forms are concerned. (2) Seven monophyletic groups are recognized within this subgenus. Two of them correspond to known species-groups, the apodemata and sinuata groups, and the remaining five are established as new species-groups, the nagatai, basdeni, taurusata, alboguttata and rufescens groups. A key to all the studied species from Asia and Europe is provided.     

“整体子思维”——中国古代“尊道”“贵德”的生存方式与当代启示

基于长期对宇宙生命存在的体悟,中国古代已孕育出以尊道贵德为内涵的整体子思维方式,衍生了整体性的生存哲学。这种整体子思维既包含人们在宇宙中的尊道之理和贵德之质,又蕴藏着社会实践活动中的尊道与贵德合一的存在秩序。而且,人类的生命价值完善就在于以尊道贵德为内容的实践过程。它不但为古代社会秩序建构提供一定的理论依据,同时还成为当代社会有序建构的可能理论来源。     

Dempster-Shafer （D-S） algorithm with credit scale in spectrum sensing

In cognitive radio, the detection probability of primary user affects the signal receiving performance for both primary and secondary users significantly. In this paper, a new Dempster-Shafer (D-S) algorithm with credit scale for decision fusion in spectrum sensing is proposed for the purpose to improve the performance of detection in cognitive radio. The validity of this method is established by simulation in the environment of multiple cognitive users who know their signal to noise ratios (SNR) and a central node. The channels between the cognitive users and the central node are considered to be additive white Gaussian noise (AWGN). Compared with traditional data fusion rules, the proposed D-S algorithm with credit scale provides a better detection performance.     

Statistical inference for simple tree order in the means of stochastic order on stratified contingency tables

In this paper, we consider testing the hypothesis that all multinomial populations in the stratified contingency table are identically distributed against the alternative that all these popula-tions are in simple tree order. We provide an asymptotic represen-tation of the order-restricted maximum likelihood estimate of the unknown parameters. The resulting estimators are proven to be n-consistent and asymptotically normal under appropriate con-ditions. A chi-squared test method is used for this hypothesis t...     

基于分数低阶统计量的正交小波盲均衡算法

对于服从分数低阶Alpha稳定分布的非高斯信号,其二阶和高阶统计量都是不存在的。当环境噪声为这种噪声时,基于高阶统计量的常数模盲均衡算法(CMA)的均衡性能很差。为了克服环境噪声服从分数低阶Alpha稳定分布时,CMA的性能缺陷,提出了一种基于分数低阶统计量的正交小波盲均衡算法。该算法利用分数低阶统计量来抑制Alpha稳定噪声,根据最小分散系数准则优化盲均衡算法的权向量,并对均衡器输入信号进行正交小波变换,通过降低均衡器输入信号的自相关性来加快收敛速度。水声信道仿真结果表明,该算法性能明显优于CMA。     

现代汉语聚合词简述

聚合词是现代汉语中一类比较特殊的词汇,它相当活跃却鲜为人所关注.本文拟以前人有限的研究成果为基础,试图对聚合词的概念、分类、语法特征等问题进行更深入的探究,并且试图从声调入手来揭示聚合词内部语素的排序规律.