不可分辨跃迁阵模型下类镍金离子M带谱的理论计算

 用不可分辨跃迁阵模型(UTA model)计算类镍金(Au ⁵¹⁺)谱中8个跃迁阵的特征参数: 平均波数(kav)、半宽度(FWHM)、总强度(W)和谱线数(L)。利用高斯分布线型,根据各个阵的总强度进行叠加,得到了在总体上与实验相一致的结果,使得在实验中对金M带谱进行时间或空间的高分辨率测量成为可能。     

The structure and magnetic properties of μ_3-oxotriiron(Ⅲ) complex [Fe_3O(OBz)_6(CH_3OH)_3](NO_3)(CH_3OH)_2

A new μ3-O triiron(Ⅲ) complex [Fe_3O(OBz)_6(CH_3OH)_3](NO_3)(CH_3OH)_2 (HOBZ = benzoic acid) has been synthesized, its structure has been determined and variable temperature magnetic susceptility has also been measured. In the molecule, three iron atoms formed an equilateral triangle with u_3-O in center. The fitting to the magnetic susceptibility showed that an intramolecular antiferromagnetic exchange interaction occurred between iron atoms with J=-25.51 cm~(-1), and a weaker intermolecular antiferromagnetic exchange interaction occurred with zJ' = -2.30cm~(-1).     

爆炸磁压缩发生器爆炸管运动研究

 报导了对爆炸磁压缩发生器(MFCG)的爆炸管进行的爆轰试验结果。用电子学方法测试了爆炸管采用的粉状RDX炸药的爆轰速度;采用高速分幅摄影方法,观测了爆炸管在管内RDX炸药爆轰产物驱动下的膨胀运动过程,测试了膨胀角、对称性和膨胀速度。试验表明,爆炸管在膨胀至 3倍初始半径内未发现破裂现象,其性能满足MFCG的设计要求。     

STUDY ON TPR OF NICKEL OXIDE CATALYSTS CALCINED AT HIGH TEMPERATURES

TPR technique has been used, to investigate the reducibilities of three types of nickel oxide catalysts calcined in air between 650℃and 1050℃: NiO/Al2O3, NiO/MgAl2O4and NiO/(CaO, MgO) · A12O3· xSiO2. The results indicate that the TPR peaks of all the catalysts were shifted toward high temperature and peak areas were gradually reduced with increasing calcination temperature. Particularly, the main TPR peaks almost disappeared at 1050℃-It was also observed that NiO/(CaO, MgO)· Al2O3 · xSiO2 catalyst was the easiest to be reduced of these catalysts, and there was a small shoulder peak before the main peak for each catalyst. Examination of these catalysts by XPS showed that there were two forms of nickel oxides on support surface .     

H^—5的正四面体中心和正方形中心构型能量的理论计算

文中用ＭＡＣＱＭ（ｍｏｄｉｆｉｅｄａｒａｎｇｅｍｅｎｔｃｈａｎｎｅｌｑｕａｎｔｕｍｍｅｃｈａｎｉｃｓ）方法计算了负离子团簇Ｈ－５的正四面体中心和正方形中心构型的能量随中心原子核到顶角原子核间距离Ｒ变化的曲线。计算得知，两种构型均在Ｒ＝１．５５ａ０时有能量极小值Ｅ正四面体中心＝－２．７８９９ａ．ｕ．，Ｅ正方形中心＝－２．７５３９ａ．ｕ．。说明Ｈ－５的这两种结构都可能存在，但正四面体中心结构较为稳定。     

Zernike多项式展开系数的时间相关性

 分析了受大气湍流扰动的光波波前在系统接收孔径上的Zernike多项式展开系数的时间相关性,在此基础上进一步分析了从不同方向到达系统接收孔径的光波波前整体倾斜之间的相关性,并给出了光波在水平均匀大气中传播时的结果。     

T型量子点结构中的自旋极化输运过程

我们利用单杂质Anderson模型及运动方程等理论,通过求解格林函数的方法研究了通过T型量子点结构(耦合于铁磁电极和介观环量子点结构)的自旋极化输运过程.研究结果表明,与量子点相耦合的铁磁电极中的极化强度是控制量子点电子输运的重要参数,由此可以达到自旋阀效应.另外我们还发现与量子点相耦合的介观环中的磁通会影响电子自旋向上和自旋向下近藤共振峰的分裂程度,但若加入适当的外磁场,那么这样的分裂将被抵消。     

A full resolution autostereoscopic 3D display based on polarizer parallax barrier

A full resolution autostereoscopic three-dimensional （3D） display prototype is developed. It is composed of a time division thin film transistor liquid crystal display panel with an optical controlled birefringence liquid crystal polarization switch and a polarizer parallax barrier. Fast driving circuits operating at 120-Hz frame rate are fabricated. The 3D images on the display have the same resolution as the corresponding two-dimensional images, which is significantly different from conventional parallax barrier autostereoscopic 3D displays having degraded 3D image resolution.     

Mesoporous carbon materials: synthesis and modification

Porous carbon materials are of interest in many applications because of their high surface area and physicochemical properties. Conventional syntheses can only produce randomly porous materials, with little control over the pore-size distributions, let alone mesostructures. Recent breakthroughs in the preparation of other porous materials have resulted in the development of methods for the preparation of mesoporous carbon materials with extremely high surface areas and ordered mesostructures, with potential applications as catalysts, separation media, and advanced electronic materials in many scientific disciplines. Current syntheses can be categorized as either hard-template or soft-template methods. Both are examined in this Review along with procedures for surface functionalization of the carbon materials obtained.