Synthesis and Crystal Structure of a Novel Zinc Phosphonate Compound： [Zn（phen）（m-OOCC6H4PO3H）]

A novel zinc（H） metal phosphonate compound [Zn（phen）（m-OOCC6H4PO3H）] 1 （phen = phenanthroline） has been synthesized under hydrothermal conditions. Single-crystal X-ray structure analysis reveals that compound 1 belongs to the triclinic system, space group P1 with a = 9.3356（19）, b = 10.203（2）,c = 10.743（2）A,α = 76.3030（70）, β= 69.2317（51）, y = 84.3833（74）°,V = 929.4（3） ,A3, Z = 2, C2OH15N2O5PZn, Mr = 459.68, Dc = 1.643 g/cm^3,μ= 1.444, mm^-1, F（000） = 468, the final R = 0.0330 and wR = 0.0848. In the structure, the central ion Zn（H） is five-coordinated, linking three O atoms with one from carboxyl and the other two from phosphonyl group. The remained two coordinate sites were occupied by two N atoms from one phen molecule to form the asymmetric unit. Then every two adjacent asymmetric units are bridged by the O atoms from phosphonate group and carboxyl to give rise to a 1D chain along the b axis. These chains are constructed by weak π-π stacking interactions and C-H…π interactions to generate a 3D supramolecular framework.     

一种新的增强ElGamal加密机制

针对传统的ElGamal加密机制不能抵抗自主选择密文攻击的问题,通过引入安全Hash函数和伪随机数发生函数给出了一种新的增强ElGamal加密机制.结果表明,该机制不仅能够抵抗自主选择密文攻击,且由于伪随机数发生函数的引入,解决了加密过程中随机数的暴露问题.该机制加密过程需要两次模幂运算,解密过程仅需一次模幂运算.完全适合于对安全性要求较高但是对系统资源要求消耗低的应用环境.     

一种新颖的用于光腔模式及光束传输模拟的特征向量法

根据有限元法单元划分的思想，提出了一种新颖的模拟光腔模式及光束传输的特征向量法. 该方法的关键之处在于基于衍射积分理论构造了一种新的光束传输矩阵，通过求解特征矩阵方程可一次性得到谐振腔的一系列特征向量，每一列特征向量即代表了腔镜上光场的一个确定模式的振幅及相位分布. 并可采用该方法模拟光场传输到腔内或腔外任意地方的场分布. 该方法将传统方法中大量的迭代过程转化成为本征积分方程特征向量的求解过程，并与初值取值无关，且可一次性求得多个模式分布，从而可方便地分析谐振腔的模式鉴别能力. 特征向量法对圆形镜共焦 关键词： 谐振腔 特征向量法 模式分布     

Synthesis and Single-crystal Structure of a Silver(Ⅰ) Carboxyarylphosphonate: [Ag(H_2BCP)(4,4'-bipy)]·2H_2O

The title compound, a novel Ag(Ⅰ) carboxyarylphosphonate [Ag(H2BCP)(4,4'- bipy)]·2H2O (H3BCP = p-H2O3PCH2C6H4COOH, 4,4'-bipy = 4,4'-bipyridine), was synthesized by a hydrothermal reaction and characterized by elemental analysis, IR spectra and single-crystal X-ray diffraction. It belongs to monoclinic system, space group P21/c with a = 5.7038(11), b = 22.397(4), c = 5.602(4) ?, β = 106.26(3)°, V = 1913.4(7) 3, Z = 4, C18H20N2O7PAg, Mr = 515.20, Dc = 1.788 g/cm3, μ = 1.182 mm-1, F(000) = 1040, the final R = 0.0404 and wR = 0.1216 for 4178 observed reflections with I 2σ(Ⅰ). In the structure, the Ag(Ⅰ) cations are bridged by 4,4'-bipy to give rise to 1D chains running along the b axis. These chains are linked further by the interactions of O (from BCP ligands) and Ag atoms to yield 2D layers. Hydrogen bonding interactions and weak π-π stacking interactions between 4,4'-bipy rings assemble such adjacent layers to generate a 3D supramolecular architecture.     

基于忆阻的时滞神经网络的全局稳定性

忆阻是近年来新发现的一类非线性电子元件．与通常的电阻不同,忆阻的阻值会随着通过的电流量的大小和方向不同而改变．这个特性使得忆阻具有了记忆的功能,在很多方面有着广泛的应用．该文给出了简化的忆阻的数学模型,基于该模型构造了时滞神经网络,利用微分包含理论、Lyapunov方法和同胚映射原理研究了其全局渐近稳定性问题,确保模型平衡点存在性、唯一性和一致全局渐近稳定性的充分条件被获得．最后提供的具有仿真的例子验证了获得的理论结果．     

全光亮镀铁工艺的研究

介绍了一种新型的电镀光亮镀的工艺,使用了“抑氢剂”,并用小槽电镀,Hull Cell实验研究了镀液的性能,还运用线性电位扫描法,旋转圆盘电极法测试了镀液的阴极极化性能和整平性能,采用SEM法观察镀层的形貌,实验结果表明：光亮剂的加入可增大铁沉积时的阴极极化,并伴有整作用,而抑氢剂可增大氢在铁上析出的过电位,从而可提高铁沉积的电流效率并降低镀层的应力。     

光腔模式及光束传输的特征向量算法

发展了一种新颖的适用于光腔模式及光束传输模拟计算的特征向量法.该方法的核心是基于菲涅耳-基尔霍夫衍射积分理论构造了一种新的光腔传输矩阵,通过求解激光谐振腔的本征积分方程,即可一次求解得到表征腔镜上多个光场模式振幅及相位分布的特征向量组;而谐振腔内或腔外任意地方的光场分布,也可采用该方法进行光束传输模拟而求得.对与该方法有关的单元划分、形函数选取、误差及稳定性分析等问题进行了论述,分析表明:合适的单元划分和形函数选取有利于提高计算速度、精度和稳定性.     

一种新型的涂丝钙离子场效应敏感器件

从1970年以来,不少学者对场效应敏感器件(简称ISFET)做了研究^[1-4],本文作者利用二-(二异辛基苯基磷酸)钙为电活性物质研制成Ca²⁺-ISFET,并测定了器件的各项性能参数。     

Unpredictability of Iteration Destination in an Integrate-and-Fire Circuit

Based on our previous study that discovered a new mechanism of the riddled-like basin appearance in piecewise continuous and noninvertible links of two conservative mappings, and the mechanism being the mixing of different attraction basins on a fat-fractal set, which was addressed as the forbidden region net [Phys. Rev. E 72 （2005） 025201（R）], we show numerically that the riddled-like attraction basins and the new mechanism appear in an integrate-and-fire circuit that can be described by piecewise continuous and noninvertible links of two dissipative mappings. This leads to the fact that vast increase of the precision of the initial condition results in practically no improvement in predictability of the iteration destination. Predictability is usually characterized by examining how error probability in the prediction, f（ε）, scales with the precision ε under the initial condition. Typically, f（ε） - ε^α with 0 ≤ α ≤ 1 being the uncertainty exponent. For riddled-like basins, a should be zero, which is in good agreement with the numerical simulation results.     

有关复合电沉积机理研究

介绍了微粒前处理、电流密度、微粒浓度、搅拌、pH值等工艺参数以及微粒表面电荷对电沉积复合镀层的影响,回顾了Guglielmi模型、MTM模型等复合电沉积机理的发展和现状．