Structure and Luminescent Properties of the First Cadmium Complex with Isophthalate and Di-pyrazole Ligands

The title complex [Cd(IPA)L(H2O)]n(1,H2IPA = isophthalic acid,L = 1,4-bis(pyra-zole-1-ylmethyl)benzene) has been hydrothermally synthesized,and characterized by elemental analyses,IR spectroscopy,TGA and X-ray single-crystal diffraction.It crystallizes in the triclinic system,space group P1 with a = 9.3060(6),b = 10.2374(7),c = 11.9706(8) ,α = 73.804(6),β = 77.883(5),γ = 85.942(5)°,V = 1070.7(1) 3,Z = 2,C22H20CdN4O5,Mr = 532.82,Dc = 1.653 g/cm3,μ = 1.062 mm-1,λ(MoKα) = 0.71073 ,F(000) = 536,R = 0.0392 and wR = 0.0640 for 3751 observed reflections with I > 2σ(I).Crystal structure analysis showed that complex 1 has a 1D double chain structure,which is assembled together through strong O-H...O hydrogen bonding interactions between coordinated water molecules and carboxylate groups of isophthalate to form a 2D supramolecular network.In addition,the solid-state fluorescent spectrum of 1 exhibits strong emission at 364 nm.     

机载卫星制导武器直接瞄准攻击研究

 介绍了卫星制导武器直接瞄准攻击方式在对地精确打击中占据的关键位置,阐述了卫星制导武器直接瞄准攻击方法的原理。由于卫星制导武器直接瞄准攻击对目标定位要求较高,采用常用定位手段已不能满足系统对目标定位的要求,分析了使用相对GPS制导成为卫星制导武器直接瞄准攻击的关键的原因。相对GPS制导误差主要包括采用载机和武器相对GPS定位误差以及传感器对目标的相对定位误差,分别对两者的定位精度进行了分析和推导。仿真结果表明：这两者的综合误差理论值小于7.5 m,满足卫星制导武器在直接瞄准攻击中对目标定位的需求。     

环境磁学

 当我们去旅游时,江西是红色之旅的重要省份。江西被称为红土地,一方面它是我国著名的革命老区,另外一方面该省地表大面积分布着外观为红色的土壤(称为红壤),红色的由来与红壤中含有的赤铁矿有关。近几年媒体报道的有人在黄河郑州段泥沙中非法淘铁,利用磁铁吸取的黑砂,则含有大量的磁铁矿。在我们的周围,上述与铁有关的物质不胜枚举,之所以如此,是因为铁是地壳中丰度第四的元素,它在环境中广泛存在。以磁铁矿、磁赤铁矿、赤铁矿、磁黄铁矿、胶黄铁矿等为代表的含铁的氧化物、硫化物,从磁学的观点,属于磁性较强的亚铁磁性物质以及具有高矫顽力的反铁磁性物质,可以较为容易地被磁学方法加以检测,因此地球科学工作者就把采集到的湖泊、海洋、河流沉积物以及土壤、岩石、大气悬浮颗粒物等物质,在野外或实验室内人为施加以磁场,观察这些物质表现出的宏观磁学性质,获得这些物质中所含的磁性矿物的类型、含量和颗粒大小等信息。样品的磁学特征一定程度上反映了物质来源、搬运过程、岩石风化成土过程、成岩作用、人类活动等综合信息,因而具有环境指示意义。环境磁学即是一门以磁性测量为核心手段、磁性矿物为载体,通过分析物质的磁性矿物组合和特征,以揭示不同时空尺度的环境作用、环境过程和环境问题的边缘学科。     

Exact maximum likelihood estimator for drift fractional Brownian motion at discrete observation

This paper deals with the problems of consistency and strong consistency of the maximum likelihood estimators of the mean and variance of the drift fractional Brownian motions observed at discrete time instants. Both the central limit theorem and the Berry-Ess′een bounds for these estimators are obtained by using the Stein’s method via Malliavin calculus.     

具有时滞的时间离散反应扩散系统行波解的存在性

本文利用上下解和交叉迭代方法研究一类具有时滞的时间离散反应扩散系统行波解的存在性.所得结果能很好地应用到时间离散的竞争系统{u_n(x)-u_(n-1)(x)=d_1?~2/?x~2u_n(x)+r_1u_n(x)[1-a_1u_n(x)-b_1u_(n-t1)(x)-c_1u_(n-t2)(x)],u_n(x)-u_(n-1)(x)=d_2?~2/?x~2u_n(x)+r_2u_n(x)[1-a_2u_n(x)-b_2u_(n-t3)(x)-c_2u_(n-t4)(x)]中,而研究其行波解存在性转化为寻找一对合适的上下解.这些结果推广了已有的一些结果.     

石墨烯/聚苯胺复合材料的制备及其电化学性能

以苯胺和氧化石墨烯(GO)为原料, 采用电化学方法制备了石墨烯/聚苯胺(GP)复合材料. 利用X射线衍射(XRD)、扫描电镜(SEM)、拉曼(Raman)光谱、X射线光电子能谱分析(XPS)对其结构、微观形貌进行了表征,并对复合材料电化学性能进行了测试. 结果表明, 复合材料保持了石墨烯的基本形貌, 聚苯胺颗粒均匀地分散在石墨烯表面, 复合材料在500 mA·g^-1的电流密度下比电容达到352 F·g^-1, 1000 mA·g^-1下比电容为315 F·g^-1, 经过1000 次的充放电循环后容量保持率达到90%, 远大于石墨烯和聚苯胺单体的比电容. 复合材料放电效率高, 电解质离子易于在电极中扩散和迁移.     

DIGGER和ISIS相结合的NMR空间定位法

本文通过采用DIGGER射频脉冲对核自旋进行选择予饱和,从而改进了ISIS技术的空间定位质量.     

BOUNDED TRAVELING WAVE SOLUTIONS OF VARIANT BOUSSINESQ EQUATION WITH A DISSIPATION TERM AND DISSIPATION EFFECT

This article studies bounded traveling wave solutions of variant Boussinesq equation with a dissipation term and dissipation effect on them. Firstly, we make qualitative analysis to the bounded traveling wave solutions for the above equation by the theory and method of planar dynamical systems, and obtain their existent conditions, number, and general shape. Secondly, we investigate the dissipation effect on the shape evolution of bounded traveling wave solutions. We find out a critical value r*which can characterize the scale of dissipation effect, and prove that the bounded traveling wave solutions appear as kink profile waves if |r| ≥ r*; while they appear as damped oscillatory waves if |r| r*. We also obtain kink profile solitary wave solutions with and without dissipation effect. On the basis of the above discussion, we sensibly design the structure of the approximate damped oscillatory solutions according to the orbits evolution relation corresponding to the component u(ξ) in the global phase portraits, and then obtain the approximate solutions(u(ξ), H(ξ)). Furthermore,by using homogenization principle, we give their error estimates by establishing the integral equation which reflects the relation between exact and approximate solutions. Finally, we discuss the dissipation effect on the amplitude, frequency, and energy decay of the bounded traveling wave solutions.     

强非线性广义 Boussinesq 方程孤波解的波形分析及求解

上海理工大学理学院\quad 上海 200093该文建立了强非线性广义 Boussinesq 方程的耗散项、波速、渐进值与波形函数的导数之间的关系.利用适当变换和待定假设方法,作者求出了上述广义 Boussinesq 方程的扭状或钟状孤波解,还求出了以前文献中未曾提到过的余弦函数的周期波解.进一步给出了波速对波形影响的结论,即:``好'广义 Boussinesq 方程的行波当波速由小变大时,波形由钟状孤波变成余弦函数周期波解;``坏'广义 Boussinesq 方程的行波当波速由小变大时,波形由余弦函数周期波解变成钟状孤波.     

一类半线性卷积积分微分方程的初边值问题

本文考虑具线性粘弹性杆受粘性阻尼的横振动所引出的积分微分方程的初边值问题，在某些条件下，得到了解的存在性、唯一性、稳定性和正则性的结论。