Some basic principles in dynamic theory of viscoelastic materials with voids

According to the basic idea of classical yin-yang complementarity and modern dual-complementarity, in a simple and unified way proposed by Luo, some basic principles in the dynamic theory of viscoelastic materials with voids can be estab- lished systematically. In this paper, an important integral relation in terms of con- volutions is given, which can be considered as the generalized principle of virtual work in mechanics. Based on this relation, it is possible not only to obtain the principle of virtual work and the reciprocal theorem, but also to derive systemati- cally the complementary functionals for the eight-field, six-field, four-field simpli- fied Gurtin-type variational principles and the potential energy-functional for the two-field one in the dynamic theory of viscoelastic materials with voids by the generalized Legendre transformations given in this paper. Furthermore, with this approach, the intrinsic relationship among various principles can be explained clearly.     

Negative Refraction and Near-Field Imaging of an Elliptical-Rod Photonic Crystal Slab in the Second Band

Negative refraction and imaging properties of the electromagnetic wave through a two-dimensional photonic crystal （PC） slab, which consists of a square lattice of elliptical dielectric rods immersed in the air background, is studied by the plane-wave expansion method and the finite-difference time-domain method. A point source placed in the vicinity of the PC slab can form a good-quality image spot through the PC slab for the incident frequencies within the second photonic band. The calculated result also shows that negative refraction occurs in this kind of PC slab.     

新型化合物[Ni(en)3]2[Ni(en)2(H2O)2][As6V15O42]·4H2O晶体的水热合成与表征

金属氧酸盐因其在医药临床、工业催化、功能材料等方面的广泛应用而引起人们的关注[1～6], 其中, 有关钒化学的研究一直很活跃, 钒具有与钼、钨明显不同的结构特性, 钒可以采取VO4, VO5和VO6方式配位, 同时, 钒的价态可以是+3, +4和+5价. 由于钒可采取多种配位方式及多种价态, 与钼酸盐和钨酸盐相比, 钒酸盐更具有结构柔顺性, 同时易形成低价或混合价态物种.在以往的文献中, 有关P-V-O体系多金属氧酸盐的水热合成的研究已有大量的报道[7], 在常规溶液合成中, 人们已对As-V-O体系进行了相对深入的研究, 而有关水热合成的研究报道却很少, 已见报道的砷钒化合物有K6*6H2O[8,9], 4-[10], 6-[11](X=SO2-3, SO2-4, H2O). 为了探究水热条件下As-V-O体系的反应特性, 我们开展了这方面的研究工作, 并取得了突破性进展. 本文采用中温水热技术合成了含有机基团的砷矾超分子化合物2**4H2O, 探讨这类化合物的非线性光学性质、催化性质及其它功能特性将是一个非常有意义的研究领域.     

压电热弹性动力学的一些基本原理 *

根据古典阴阳互补和现代对偶互补的基本思想 ,通过作者早已提出的一条简单而统一的新途径 ,系统地建立了压电热弹性体动力学的一些基本原理 .文中给出一个重要的以卷积表示的积分关系式 ,可以认为 ,在力学上它是广义虚功原理的表式 .从该式出发 ,不仅能得到压电热弹性动力学的虚功原理和互等定理 ,而且通过作者所给出的一系列广义Legendre变换 ,能系统地导出成互补关系的 1 1类变量 ,9类变量 ,6类变量和 3类变量简化Gurtin型变分原理 .同时 ,通过这条新途径 ,还能清楚地阐明这些原理之间的内在联系     

两种二茂铁甲基二氧大环多胺的电化学性质

利用循环伏安法对我们新设计合成的两种二茂铁甲基二氧大环多胺化合物——１－二茂铁甲基－１,４,８,１１－四氮杂环十三烷－５,７－二酮（简称ＦｃＣＨ２Ｌ１）和１－二茂铁甲基－１,４,７,１１,１４－五氮杂环十六烷－３,１５－二酮（简称ＦｃＣＨ２Ｌ２）——的电化学性质进行了研究,包括酸碱度的影响以及它们对Ｚｎ２＋,Ｃａ２＋,Ｃｄ２＋,Ｃｕ２＋,Ｎｉ２＋,Ｃｏ２＋等金属离子的电化学响应情况．在乙醇和水的混合溶剂体系中化合物ＦｃＣＨ２Ｌ１对Ｎｉ２＋具有选择性络合,而化合物ＦｃＣＨ２Ｌ２对高氧化态的Ｎｉ３＋有稳定作用     

A Zn(Ⅱ) 5-Aminoisophthalate Coordination Polymer

The title compound, [Zn(AIP)(4,4-bipy)0.5(H2O)]n·0.75nH2O 1, was synthesized via the hydrothermal reaction of Zn(OAc)2 with 5-aminoisophthalic acid (H2AIP) and characterized by elemental analysis and infrared spectra. The complex crystallizes in monoclinic system, space group P21/c with a = 12.672(1), b = 7.6557(4), c = 16.181(1) (A),β = 109.187(2)o, V = 1482.6(2) (A)3, Z = 1, C52H52N8O23Zn4, Mr = 1418.58, Dc = 1.589 g/cm3, F(000) = 724 and μ(MoKα) = 1.685mm-1. The final R = 0.0702 and wR = 0.1524 for 1847 observed reflections with Ⅰ ＞ 2σ(I), and R = 0.0873 and wR = 0.1664 for all data. X-ray diffraction studies reveal that the title compound has an interesting 2D microporous architecture with guest water molecules inside the channel.     

三元配合物钯（Ⅱ）-2,2''-联吡啶-L-天冬氨酸与DNA作用研究

The ternary complex Pd(Ⅱ)-2,2‘-bipyridine-L-asparagic acid was synthesized and characterized by elemental analysis, IR-spectra and molar conductance. The formula of the complex is Pd(bipy)(L-asp). The interaction of the complex with DNA has been studied by UV-spectra, fluorescence spectra, CD-spectra and gel electrophoresis. The results showed that the interaction of the complex with DNA performed mainly in intercalative mode and the extent of interaction was dependent on the concentration of the complex.     

Evolution of Er^3＋ Distribution in the Oxyfluoride Glass Ceramics with Heating

The distribution characteristics of Er3+ ions doped in the oxyfluoride glass ceramics containing LaF3 nanocrystals heat-treated at 650 ℃ for different durations were investigated. The results of the integral absorption cross-section analysis demonstrated that the partition fraction of Er3+ in LaF3 nanocrystals increases with prolonging of heating time. The anomalous phenomena of Er3+ emissions in the up-and the down-conversion fluorescence spectra are well explained based on the calculated results.     

一种二帽pseudo-Keggin结构簇合物[HN(C_2H_5)_3]_3[N(C_2H_5)_3]_2[Mo_8~ⅣMo_4~ⅤV_2~ⅣO_(38)(PO_4)]的水热合成、结构和性质研究

金属－氧簇合物因其结构多样性及在催化、材料和医药等方面的应用而引起人们的关注犤１犦。在众多金属－氧簇合物中，Keggin结构及金属取代Keggin结构金属－氧簇被大量报道，但由于很难获得高质量单晶，有关二帽Keggin结构的报道非常少，目前只有几例报道犤２～９犦。近年来，随着水热法应用到金属－氧簇的合成，陆续获得了一系列具有新颖结构的簇合物。１９９８年，通过水热法获得了第一个二帽pseudo－Keggin结构簇合物犤NH４犦４H犤PMo８VⅣ４VⅤ２O４２犦·２４H２O犤１０犦。我们用水热法以三乙胺做模板剂获得了一种全新的二帽pse…     

Synthesis and Crystal Structures of Novel Keggin and Dawson Polyoxometalates Containing Amantadine

Heteropolyoxometalates are a large family of potent medicines due to their excellent antiviral and antitumor activity 1-4, while their application in clinic meets great difficulties for their toxicity 5. How to synthesize heteropolyoxometalate medicines possessing high activity and low toxicity has become the focus in heteropolyoxometalate medicine research. Previously reported polyoxometalates showing medical activities are all salts simple Na+, K+ or NH4+ etc. inorganic cations, in which o…