从高频地波雷达回波谱中检测移动目标信息的初步研究

提出了一种适合于高频海态雷达移动目标检测的方法,该方法的原理基于硬目标与海面连续目标之间特征尺度不同。利用数值模拟说明了这种方法的有效性,将它应用到OSMAR2000高频地波雷达对比验证试验期间实测数据的处理中,获得了一个由两个单站同时探测得一个可能的移动目标的实例,同时指出这种方法在海流提取中应用的可能性。     

高频地波雷达信号波形分析

根据雷达设计的一般原理,综合研究了雷达波形分析的一般概念、处理技术和主要结果;尤其对国家863计划海洋领域重大课题要求研制的高频地波雷达的特殊需要,深入研究了线性调频中断连续波（FMICW）的基本理论、波形参数和处理方法,使之成为高频地波雷达OSMAR2000信号波形设计的基础。     

半正规n-极大子群对有限群结构的影响

设△↓n(G）为有限群G的n次极大子群的全体。1．若△↓4（G）中的子群均在G中半正规,则下述结论之一成立：（1）G是可解群;（2）G／φ（G）＝A5,（3）G/φ(G)=PSL(2,13);(4)G／φ（G）＝PSL（2,p),满足p=4p1 1=6p2-1,这里p1≥43,p2≥29;(5)G/φ(G)=PSL(2,p),满足p=6p1 1=4p2-1,这里p1≥7,p2≥11.2。2．设3不属于π（G）,若△↓（G）中的子群均在G中半正规,则G是可解群,或G／φ(G)=Sz(2^3).     

Determination of Danshensu, a major active compound of Radix Salvia miltiorrhiza in dog plasma by HPLC with fluorescence detection.

A simple and sensitive high performance liquid chromatography method has been developed for the determination of Danshensu (3, 4-dihydroxyphenyllactic acid) in dog plasma. Plasma samples were extracted with ethyl acetate. Analysis of the extracts was performed on a reversed-phase column with an aqueous phosphate buffer-acetonitrile (93:7, v/v) mobile phase, and 4-hydroxybenzoic acid was used as the internal standard. Fluorescence detection at 285 nm (excitation) and 320 nm (emission) was employed. Standard curves were linear in the range from 0.125 to 11.3 microg/mL (regression coefficient r > 0.993) on three different days. Mean recovery was determined as 96.4% by analysis of plasma standard containing 0.63, 5.65 and 11.3 microg/mL of Danshensu. The inter-day precision (RSD) ranged from 3.4 to 8.6% at concentrations of 0.125, 1.88, 6.28 and 11.3 microg/mL, and the intra-day precision was better than 7.2%. The detection and quantitation limits were 0.063 and 0.125 microg/mL, respectively. This validated assay was applied to the determination of Danshensu concentration in dog plasma after oral administration of Radix Salvia miltiorrhiza extracts.     

Synthesis,spectroscopic and voltammetric studies of mixed-ligand copper(II) complexes of amino acids

Two Cu^II complexes of the type [Cu(L¹)(L²)] (where L¹ = tryptophanate or phenylalaninate; L² = cysteine thiolate) have been prepared and characterised, and their spectrophotometric and voltammetric behaviour has been investigated. The results obtained by means of FT-IR, e.s.r., u.v.–vis. spectroscopy and by voltammetry revealed the existence of two different [Cu(L¹)(L²)] complexes. A significance decrease in the g _|| value and, concomitantly, an increase in the d–d transition energy was observed when a mixed-ligand complex is present. The observed anisotropic g-values indicate the presence of Cu^II in a tetragonally distorted octahedral geometry. Formation of a mixed-ligand copper complex can be considered as a type of synergism in the presence of cysteine. The redox state Cu^II or Cu^I of copper in the Cu(L²) complex depends on the analysing conditions, i.e., cysteine forms a Cu^II complex under aerobic conditions and a Cu^I complex in anaerobic media. Tryptophan or phenylalanine is bound to Cu^II ions in the Cu(L¹) complexes.     

Hydrothermal growth of boron nitride microcrystals

Boron nitride (BN) crystals with size of several micrometers have been successfully synthesized by hydrothermal method. The reactants used in our experiments were boric acid (H₃BO₃), sodium azide (NaN₃) and white phosphor (P). The samples were characterized by X‐ray diffraction (XRD), Fourier transformation infrared spectroscopy (FTIR), selective area electron diffraction (SAED). It is found that the existence of Cl^‐ in the reaction mixture has much effect on the synthesis of BN. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

微波消解ICP-MS法同时测定鲸肉中10种元素

本文采用微波消解样品,ICP－MS法同时测定鲸肉中K、Na、Ca、Mg、Fe、Mn、Zn、Cu、Se、Ge10种元素的含量,在最佳实验条件下,RSD为1.21%－3.87%,标准加入回收率为95.6%-101.9%,方法简便、可靠。     

新型三维H0.5CoP0.5O2.5的水热合成与结构表征

分子筛在催化、吸附和离子交换等方面具有广泛的应用 ,一直是重要的工业材料 .自 1 982年Wilsion首次合成磷酸铝以来 [1] ,人们发现磷酸盐具有类似于分子筛的结构特征 [2～ 4 ] ,随着研究的不断深入 ,近来具有空旷结构的磷酸盐分子筛由于在催化、光学、磁学等领域具有潜在的应用前景日益受到人们的关注 .具有微孔结构的过渡金属磷酸盐因可作为分子反应器而使许多新的过渡金属磷酸盐被合成出来[5～ 9] .文献 [1 0 ,1 1 ]报道 Co PO4 具有层状、多孔、高聚合度的结构 ,这些分子多数经过有机模板剂或其它分子的修饰 ,形成混合配体的配合物 .…     

Experimental and computational studies on the solvation of lithium tetrafluorobrate in dimethyl sulfoxide

Solvation structures of the lithium cation and tetrafluorobrate anion in dimethyl sulfoxide (DMSO) were investigated by Raman spectroscopy and ab initio calculations at various salt concentrations. The SO and C S stretching bands were used to monitor the structural change of the solvation shell. It has been shown that the solvation number of Li⁺, calculated by the changes in intensities of the C S asymmetric and symmetric stretching bands, is consistent with the value predicted by ab initio calculations. The wavenumber shift of the C H stretching band is suggested to be the result of the anion solvation and the dissociation of the associated DMSO molecules. Copyright © 2007 John Wiley & Sons, Ltd.     

染料-示波计时电位法测定天然水中的不同形态铝

槲皮素;羟基喹啉-磺酸;染料-示波计时电位法测定天然水中的不同形态铝