Crystallographic report: a double chain coordination polymer: {[Zn(H2O)6][Zn(3,3′,4,4′‐benzophenonetetracarboxylate)H2O]·4H2O}n

The double‐chain coordination polymer, {[Zn(H₂O)₆][Zn(bbtc)H₂O]·4H₂O}_n (bbtc = 3,3′, 4,4′‐benzophenonetetracarboxylate), features two kinds of zinc center. One is octahedrally coordinated by six aqua ligands and the other is coordinated by four carboxylate oxygen atoms, derived from three bbtc ligands, and a water molecule, forming a geometry intermediate between square‐pyramidal and trigonal bipyramidal. Copyright © 2003 John Wiley & Sons, Ltd.     

模糊复分析学研究进展

综述模糊复分析学的研究进展并对其发展历史进行了简单回顾,主要介绍了近年来有关模糊复分析研究的一些主要成果,最后对该学科今后需要进一步研究的课题进行了分析和概括.     

电介质的频域特性与测量

从物质的分子结构基本模型出发，简要介绍了介电频域理论，提出了有关新的测量方法。     

复Grassmann流形上陈氏示性式的积分公式──谨以此文纪念我们的老师吴光

在本文中给出了复Ｇｒａｓｓｍａｎｎ流形上陈氏示性式Ｃ＿ｋ（Ω）的积分公式如下：     

Infrared spectra of carbon monoxide-hydrogen sulfide van der Waals complexes in the C-O stretching region

The CO-stretching vibration-rotation spectra of CO-H₂S, CO-D₂S, and CO-HDS complexes have been studied in the 2150 cm⁻¹ region using a supersonic slit-jet expansion and a tunable diode laser spectrometer. The spectra were analyzed with the help of very recent microwave pure rotational studies of the same complexes. Two bands were assigned for each of the symmetric hydrogen sulfide isotopes, corresponding to the two nuclear spin modifications, para and ortho. The band origins were blue shifted, relative to the free CO molecule, by about 3.8 cm⁻¹ for CO-H₂S and 4.3 cm⁻¹ for CO-D₂S. These are considerably smaller shifts than exhibited by the related CO-water complexes, indicating that the intermolecular forces in CO-H₂S are weaker and more isotropic.     

Pulsed jet rotational spectra of the propylene oxide-neon molecular adduct

Rotational transitions of the propylene oxide-²⁰Ne and propylene oxide-²²Ne molecular adducts have been measured, in the frequency region from 4 to 18 GHz, using a pulsed jet Fourier Transform microwave spectrometer. The transition frequencies were used to refine the rotational and distortion spectroscopic constants obtained from the previous free jet millimetre wave measurements of the complex. No splittings due to the methyl group internal rotation were detected.     

Sensitized luminescence properties of dinuclear lanthanide macrocyclic complexes bearing a benzophenone antenna

Dinuclear lanthanide (Ln=Tb³⁺ or Eu³⁺) complexes (Ln₂L2) of two octadentate macrocyclic polyaminopolycarboxylic ligands connected through a benzophenone (BP) moiety (L2) have been synthesized. Sensitized luminescence properties of Ln₂L2 in water have been studied in comparison to those of BP-conjugated mononuclear Ln complexes (LnL1). The luminescence intensity of Tb₂L2 is lower than that of TbL1 because of lower triplet quantum yield of the BP moiety. In contrast, Eu₂L2 shows higher intensity than EuL1. For both Eu complexes, energy level of triplet excited-state BP (³BP*) is only 3 kJ mol⁻¹ higher than that of ⁵D₂ excited-state of Eu³⁺. The ⁵D₂ state formed by a triplet-energy transfer (TET) from ³BP* is therefore deactivated by a back energy transfer (BET) to the ground-state BP, resulting in low luminescence intensity of EuL1. In contrast, within Eu₂L2, TET from ³BP* to ⁵D₀ state of two Eu³⁺ ions is accelerated, thus leading to higher luminescence intensity. Another notable feature of Eu₂L2 is the luminescence quantum yield independent of its concentration. In contrast, for EuL1 system, an intermolecular BET occurs from ⁵D₂ state of Eu³⁺ to the ground-state BP conjugated to another EuL1 complex, resulting in a yield decrease with the concentration increase.     

应力条件下压电陶瓷损失机理分析

压电陶瓷材料中主要包括三种不同损失,即介电损失、机械损失和压电损失。为了研究这三种损失的机理并由实验方法分别测量这三种损失的大小,本文利用复参数理论对压电陶瓷材料(PZT-4)建立了使用复参数表示的损失理论模型;讨论了三种损失的物理意义并推导了通过测量等效参数分别计算三种损失的具体方法;测量了在应力条件下压电陶瓷等效电路中的谐振点阻抗、反谐振点阻抗、串连电阻和品质因素的变化情况并以此计算出三种损失随应力的变化。     

复杂结构热屈曲有限元分析

实现了机械载荷和温度载荷共同作用下复杂结构的弹性分歧热屈曲有限元分析，计算结果表明，局部温度场将使结构的屈曲强度大幅度降低。复杂结构的热屈曲研究具有理论和实际意义。本文研究成果表明，从计算结构力学角度出发，探讨强热源作用复杂结构引起宏观破坏机理研究的可行性     

Integration of an Equilibrium System in an Enhanced Theory of Bending of Elastic Plates

The complete integral of the system of partial differential equations governing the equilibrium bending of elastic plates with transverse shear deformation and transverse normal strain is constructed by means of complex variable methods. The process helps to elucidate the physical meaning of certain analytic constraints imposed on the asymptotic behavior of the solutions and shows that in the case of an infinite plate, any analytic solution has finite energy if and only if the bending and twisting moments, the transverse shear force, the displacements in vertical planes, and two other characteristic quantities vanish at infinity. An example is discussed to illustrate the theory.