Synthesis and Crystal Structure of a One-dimensional Mn（Ⅱ） Coordination Polymer with 1,3-bis（4-pyridyl）propane

A new 1D zigzag chain coordination polymer, { [Mn（bpp）（bac）2]·（CHaCN）}n 1 （bpp = 1,3-bis（4-pyridyl）propane, Hbac = benzoylacetone）, has been synthesized and characterized by FT-IR spectroscopy, thermal analysis and X-ray single-crystal diffraction. In the molecular structure, all Mn atoms locate in an octahedral geometry. The guest CH3CN molecules are included in the 1D channels of the 3D packing structure of 1. Crystal data： C35H35MnNaO4, Mr = 616.60, monoclinic, space group P211c, a = 17.691（4）, b = 18,955（4）, c = 9.712（6） A, β = 93.91（3）°, V = 3249.31（1） A^3, Z = 4, Dc = 1.260 g/cm^3, F（000） = 1292, 20max = 54.9°, μ = 0.447 mm^-1, the final S = 1.020, R = 0.0693 and wR = 0.1497.     

Solution‐Based Evolution and Enhanced Methanol Oxidation Activity of Monodisperse Platinum–Copper Nanocubes

Shape‐controlled catalysis : High‐quality Pt–Cu nanocubes with an average size of about 8 nm (see picture, scale bar=20 nm) were synthesized from a high‐temperature organic solution system in the presence of various capping ligands. These cubic Pt–Cu nanocrystals terminated with {100} facets demonstrated a superior catalytic activity towards methanol oxidation compared to similar sized Pt–Cu and Pt nanospheres.

     

Approximating fixed points of a pair of contractive type mappings in generalized convex metric spaces

In this paper, we consider an Ishikawa type iteration process with errors, which converges to the unique common fixed point of a pair of contractive type mappings in complete generalized convex metric spaces. Furthermore, we obtain the corresponding results in Banach spaces. Our results extend and generalize many known results.     

含异恶唑二铁配合物的合成、表征及电催化产氢性能和抗菌活性

本文报道了4个含异恶唑基团的二铁配合物的制备及其结构表征。以含羟基二铁配合物[Fe₂（CO）₆（μ-SCH₂CH（CH₂OH）S）] （1）与5-甲基异恶唑-4-羧酸为原料,经过酯化反应以高产率制备了配合物[Fe₂（CO）₆（μ-SCH₂CHCH₂OOC（5-C₃HNOCH₃）S）] （2）,再分别与三（对甲苯基）膦、三（4-氟苯基）膦或三（2-甲氧基苯基）膦反应,合成了3个含膦配合物[Fe₂（CO）₅（L）（μ-SCH₂CHCH₂OOC（5-C₃HNOCH₃）S）],其中L=P（4-C₆H₄CH₃）₃ （3）、P（4-C₆H₄F）₃ （4）、P（2-C₆H₄OCH₃）₃ （5）。使用元素分析、谱学和X射线晶体学对新配合物的结构进行了表征。电化学性质研究表明这些配合物可以催化醋酸中的质子还原产生氢气。其中,2拥有最低的过电位而4拥有最高的催化效率。此外,该类配合物还具有一定的抗菌活性。     

A Study of the Behavioral Controllability for Superposed Kuznetsov-Ma Soliton of the （3＋1）-Dimensional Generalized Nonlinear Schrodinger Equation

Abstract The （3＋1 ）-dimensional variable-coetfficient nonlinear SchrSdinger equation with linear and parabolic traps is studied, and an exact Kuznetsov-Ma soliton solution in certain parameter conditions is derived. These precise expressions indicate that diffraction and chirp factors influence phase, center and widths, while the gain/loss parameter only affects peaks. By adjusting the relation between the maximum accumulated time Tm and the accumulated time To based on maximum amplitude of Kuznetsov Ma soliton, postpone, maintenance and restraint of superposed Kuznetsov-Ma solitons are investigated.     

Nonlinear tunneling for controllable rogue waves in two dimensional graded-index waveguides

With the help of the similarity transformation connected the variable-coefficient nonlinear Schrödinger equation with the standard nonlinear Schrödinger equation, we firstly obtain first-order and second-order rogue wave solutions in two dimensional graded-index waveguides. Then, we investigate the nonlinear tunneling of controllable rogue waves when they pass through nonlinear barrier and nonlinear well. Our results indicate that the propagation behaviors of rogue waves, such as postpone, sustainment and restraint, can be manipulated by choosing the relation between the maximum value of the effective propagation distance Z _m and the effective propagation distance corresponding to maximum amplitude of rogue waves Z ₀. Postponed, sustained and restrained rogue waves can tunnel through the nonlinear barrier or well with increasing, unchanged and decreasing amplitudes by modulating the ratio of the amplitudes of rogue waves to barrier or well height.     

SHEAR-HORIZONTAL WAVES IN A ROTATED Y-CUT QUARTZ PLATE WITH AN ISOTROPIC ELASTIC LAYER OF FINITE THICKNESS

We study shear-horizontal (SH) waves in a rotated Y-cut quartz plate carrying an isotropic elastic layer of finite thickness.The three-dimensional theories of anisotropic elasticity and isotropic elast...     

羊栖菜幼苗北方海区渡夏培育的研究

开展羊栖菜不同品系在北方海区培苗试验和不同种苗培育方式研究,结果表明:幼苗可以在北方海区渡夏培育成为羊栖菜栽培的种苗,到10月下旬达到苗种的规格,返回浙江海区下海养成,具有良好的产业前景.     

基于CSA-SQP的预测控制器参数整定研究

针对预测控制器参数整定困难, 提出了一种基于克隆选择和序列二次规划的预测控制器参数整定算法, 建立了一个基于免疫原理和序列二次规划算法进行控制器参数整定的机制, 并给出了参数整定问题中的抗原、抗体及亲和力的定义. 在此基础上, 针对系统的不确定性干扰, 构造了基于事件触发的参数调整框架. 最后, 将算法应用于仿真实验, 通过与设定值控制结果的对比, 证明所提出的预测控制器参数整定方法是有效的.     

基于原理实例检索的可变功能产品功能升级再设计

针对可变功能产品随市场变化导致其功能和性能存在不足之处的情况, 提出了用于该类产品功能升级再设计的“原理实例检索法”. 首先, 归纳总结出功能升级的4种基本类型, 依据总结出的功能升级类型, 从功能需求的角度出发, 提出了一个功能升级辅助再设计软件原型系统, 用以进行原理实例的检索. 若检索结果无相关原理或实例支持功能升级, 则对升级功能进行TRIZ(发明问题解决理论)工程参数转化, 通过构建冲突矩阵获得创新原理解. 以电动工具为例, 建立的功能升级辅助再设计系统搜集了用于实现电动工具常见功能的基本原理和实例, 并利用Access数据库和Visual Basic 6.0对设计信息进行存储和原型系统构建. 其次, 对升级功能结构和原共享结构间的匹配情况进行分析, 得出结构匹配可能出现的5类基本情况. 最后, 以电钻“打磨固体”升级功能设计为实例, 利用上述功能升级再设计方法, 设计出了磨砺性能良好的“去锈打磨盘”, 验证了所提出的可变功能产品功能升级再设计方法的可行性.