A5与PSL（2，7）的特征及有限CIT—群

本文验证了A5和PSL（2，7）是非阿贝尔单群中含对合数最少的两个群（前者含15个对合，后者含21个对合）。同时，对有限CIT－群G的可解性和有限不可解CIT－群的对合数也做了讨论。     

OPTICAL DIAGNOSTIC AND MODELING SOLUTION GROWTH PROCESS OF SODIUM CHLORATE CRYSTALS

Both a real time optical interferometric experiment and a numerical simulation of two-dimension non-steady state model were employed to study the growth process of aqueous sodium chlorate crystals. The parameters such as solution concentration distribution, crystal dimensions, growth rate and velocity field were obtained by both experiment and numerical simulation. The influence of earth gravity during crystal growth process was analyzed. A reasonable theory model corresponding to the present experiment is advanced. The thickness of concentration boundary layer was investigated especially. The results from the experiment and numerical simulation match well.     

Z箍缩等离子体不稳定性的数值研究

利用二维辐射磁流体程序模拟了钨丝阵Z箍缩等离子体腊肠不稳定性的演化：分析了存在不稳定性与没有不稳定性条件下等离子体内爆的差异；研究了不同初始密度扰动对x射线输出 功率和能量的影响.数值结果表明，在一定初始密度扰动范围内，这种不稳定性对x射线输 出的总能量影响不显著，但对x射线功率随时间变化的曲线有明显的影响.此外，还探讨了Z 箍缩等离子体数值模拟中低密度区的数值处理对数值结果的影响. 关键词： Z箍缩 腊肠不稳定性 数值模拟     

Study on the behavior of hyper-rayleigh scattering for silver nanoparticles with aggregation effects

The absorption spectra as well as the Hyper-Rayleigh scattering (HRS) signals of a highly monodisperse 10.5-nm diameter silver colloids with the addition of KNO(3) and pyridine have been measured. Strongly enhanced HRS signals are observed by 15x and 6x, respectively. Through size distribution and TEM measurements, the morphology of aggregated silver nanoparticles has been observed as a chainlike aggregation. The dramatically enhanced second-order nonlinearity was explained by the enhanced electromagnetic (EM) field near the surface of the silver nanoparticles as they approached. The different enhancement between these two kinds of aggregates was considered with the diversity of separated distance between silver nanoparticles. The experimental results reveal that there is an optimum size for the aggregates to yield the maximum HRS response.     

在聚乙烯醇-124存在下钌-二氯化锡-乙基紫离子缔合体系测定钌的研究

本文对钌(Ⅲ)SnCl_2-EV高灵敏显色体系测定钌进行了研究。摩尔吸光系数ε_(640nm)高达1.5×10~5L.mol~(-1)·cm~(-1),钌含量在0.2～1.4和1.4～2.2μg/25ml范围内符合比尔定律.对外来离子的干扰进行了研究,并对纯金属镍中痕量钌的含量进行了测定。     

醚链桥接芳香二醛及其缩氨硫脲的合成

一些缩氨硫脲及其衍生物对结核、麻风、风湿、疟疾、天花、真菌和某些肿瘤有一定的药理活性。缩氨硫脲的真菌活性是由于它的配位原子在生物体的新陈代谢中和真菌所需的金属离子螯合。缩氨硫脲具有与氨基酸、肽、蛋白质、酶、核糖核酸等生物配体相同的配位原子、被看作研究生物配体和痕量金属离子配位的优良模型。因为聚乙二醇醚链上的氧原子能与金属离子配位,所以在缩氨硫脲分子中连接上聚乙二醇醚链,增加缩氨硫脲分子中的配位原子种类和数目,也许能够增强螯合剂的配位能力,扩展其与金属离子的螯合围范。为此,我们将缩乙二醇二氯化物和苯环上带酰基的苯酚反应,制成化合物1_(a-h),然后再与硫代氨基脲缩合,得到醚链桥接的芳香醛缩氨硫脲2_(a-g)。它们的合成路线和主要结构如下:     

General covariant energy-momentum conservation law in general spacetime

We discuss the conservation laws in general spacetime with torsion and nonmetricity by use of the Noether theorem. We give a general Lagrangian density, which can be reduced to the one given by Rauch and Nieh (1981). The general covariant energy-momentum conservation law is obtained with respect to the general displacement transformationX ^' =X +e _a b ^b , which is a special case of general conservation laws. It is shown that in such a case, the existence of superpotentials is assured. The results are the natural extension of references [1,2].