基于Matlab GUI的照度测量仿真平台

基于可见光通信技术(VLC)光定位对照度变化的需求,建立了以发光二极管(LED)为光源的实验平台,并借助矩阵实验室(Matlab)GUI设计了一款可为室内光定位提供照度分布的软件。该软件模拟获得了室内照度强弱的变化分布图,与理论仿真结果吻合,证明了该软件的有效性。     

软交换技术在电力通讯系统中的应用前景

科学技术不断发展,人们的生活水平不断提高,电力通讯技术也应跟上时代步伐.传统的电力通讯技术已不能满足客户的需求,在电力通讯系统中加入软交换技术,不仅能满足客户对网络的使用需求,还有利于促进我国电力通讯事业的迅速发展.软交换技术接口准确性强、设备伸缩性高、业务开放度好,还可以给客户提供方便快捷的呼叫功能,因而受到广大客户和运营商的青睐.本文首先介绍了软交换技术的定义、设备组成、软交换技术与电力通讯系统的集成以及软交换技术的优势,进而分析了软交换技术在电力通讯系统中的应用前景.     

Intramolecular stacking interaction in mixed-ligand complexes containing ATP4- and aromatic N-heterocyclic ligands

The stability constants of the binary ML2+ and ternary M(ATP)L2- complexes,where L=Iq (isoquinoline) or BIm (benzimidazole) and M=Zn2+ or Cd2+,have been determined by poten-tiometric pH titration in aqueous solution at I=0.1 mol/L (NaClO4),T=25℃.The stability of the ternary complexes characterized by corresponding to the equilibrium M(ATP)2-+ML2+=M(ATP)L2-+M2+ is higher than what would be expected on statistical grounds.The increase may be related to the stacking interaction between the aromatic ring of the ligands L and the purine moiety of ATP4- 1H NMR studies of Zn2+/ATP4-/L confirm the presence of stacking in the ternary complexes.It is concluded that the strength of the intramolecular stacking interaction is dependent on the structure of the aromatic ring of the ligand L and the formation of a metal ion bridge.Possible implications are discussed briefly.     

配合物[Cu(L-Ile)(TATP)(H2O)]ClO4的结构、表征及与DNA之间的相互作用

Ternary complex [Cu(L-Ile)(TATP)(H₂O)](ClO₄)] was synthesized and characterized by molar conductivity, rotational analysis, spectroscopic (IR and UV-Vis) and X-ray diffraction methods, where L-Ile=L-Isoleucine, and TATP=1,4,8,9-tetraazatriphenylene. The complex crystallizes in triclinic space group P1 with two molecules in a unit cell of dimensions a=8.240 3(9) nm, b=11.914 9(13) nm, c=13.436 0(15) nm, α=109.136(2)°, β=101.101(2)°, γ=106.302(2)°. V=1.209 2(5) nm³, Z=2, D_c=1.589 Mg·m^-3, μ=1.132 mm^-1，R₁=0.036 9, wR₂=0.098 0. The crystal contains two independent [Cu(L-Ile)(TATP)(H₂O)]⁺ complexes for Cu₁ and Cu₂, respectively, having essentially the same distorted square-pyramidal structure, where each Cu(Ⅱ) ion is coordinated with two nitrogen atoms of TATP and the amino nitrogen atom and one carboxylate oxygen atom of L-Ile in the equatorial positions and one water oxygen atom at an axial position. Furthermore, the primary studies on the interaction between the complex and calf thymus DNA were also performed by electronic absorption spectroscopy and viscosity methods. CCDC: 244231.     

陶瓷电容器化学镀铜的研究

陶瓷电容器化学镀铜的研究袁永明万家义王惠萍（四川大学化学系成都６１００６４）关键词陶瓷电容器以铜代银化学镀中图分类号Ｏ６９陶瓷电容器是最基本的电子元件，目前国内外大都采用涂银（印银）－烧银法制作银电极。这种方法需要消耗大量的贵金属银，设备投资贵、成本...     

M（Ⅱ）（ATP）^2—与核酸碱基（腺嘌呤,胞嘧啶）三元混配配…

用ＰＨ电位滴定法测定 篱子（Ｍ＾２＋＝Ｃｕ＾２＋，Ｃｏ＾２＋，Ｎｉ＾２＝，Ｚｎ＾２＋，Ｃｄ＾２＋）与核酸碱基（Ｐ＝腺嘌呤，胞嘧啶）形成的二夫配合物以及与腺甘－５＇－三酸（ＡＴＰ）形成的三元混配配合物的稳定常数，三元配合物相对于二元酚物的稳定性用平衡常数ΔｌｇＫＭ大，这可能与三元混配配合物分子内存在配体间的芳环堆积、氢键作用以及πＡ－πＢ协同效应有关。     

关于二元酸与二元醇的聚酯反应和酯化与水解反应动力学

关于二元酸与二元醇的聚酯反应动力学,Flory和等人都会做过研究,唐敖庆等在较广泛的实验基础上提出氢离子催化机理及其动力学.酯化机理为:     

ReCl（CO）5-catalyzed Reactions of Aromatic Compounds with 1,3,5-Trioxane or Aqueous Formaldehyde Affording Diarylmethanes

ReCI（CO）5 catalyzed the dehydration reaction of aromatic compounds with 1,3,5-trioxane or aqueous formaldehyde （37 wt%） under air. The reactions of a variety of aromatic compounds beating electron-donating group（s） with 1,3,5-trioxane afforded the corresponding diarylmethanes in moderate to good yields.     

"化学概念"研究角度的反思

通过查阅近几年国内化学教育类期刊关于化学概念的研究文章,及一些和社会、生活、技术、环境直接相关的化学概念的研究文章,发现对于基础的、抽象的化学概念学习和教学有比较多的研究;对和生活有直接联系的化学概念的学习和教学则很少关注,或者只是关注概念含义的解释,很少关注学生头脑中对这些和社会、生活、技术、环境直接相关的化学概念的认识是怎样的。     

多层片式ZnO压敏电阻器的现状与发展方向

基于国内外多层片式ZnO压敏电阻器的研究及应用,介绍了多层片式ZnO压敏电阻器的结构(阵列及模块)、材料组成(ZnO-Bi2O3系、ZnO-玻璃系、ZnO-V2O5系及ZnO-Pr6O11系等)、电极材料、生产工艺(流延和电镀)等现状,并就多层片式ZnO压敏电阻器的工艺和技术发展趋势提出了见解。