Study on the thermal decomposition kinetics of<Emphasis Type="Italic">cis/trans-</Emphasis>[Cu(gly)<Subscript>2</Subscript>] • H<Subscript>2</Subscript>O

The thermal decomposition reactions of the complexescis/trans-[Cu(gly)₂] ? H₂O were studied by TG-DSC methods. The results showed that they have similar decomposition process, which occur in two steps. The first step is the loss of water and the second step is the decomposition of anhydrous complexes. But forcis-[Cu(gly)₂]?H₂O, the temperature of losing water is higher than that oftrans-isomer. Their reaction mechanisms of the two-step decomposition were also proposed.     

夹心型杂多化合物Na_9[CeW_(10)O_(36)]·34H_2O的合成及晶体结构

在pH≈6.5及NaAsO_2和Co(NO_3)_3·6H_2O存在下,Na_2WO_4·2H_2O 与Ce (NO_3)_3·6H_2O反应,得到了Na_9[CeW_(10)-O_(36)]·34H_2单晶。用元素分析 及X射线单晶衍射法确定了其组成与结构,晶体学数据为：a = 1.3010(5) nm, b = 1.3072(5) nm, c = 1.9962(8) nm, α= 101.073(7) °, β = 104.411(5) ° γ = 90.473(4) °, V = 3.221(2) nm~3,空间群P1,V=3.211(2)nm~3, Z = 4, 最终R因子[1>2σ(I)]R_1=0.0424, wR_2 = 0.0549, R因子（全部数据）R_1=0. 1357, wR_2 = 0.0808.[CeW_(10)O(36)]~(9-)具有D_(4d)对称性。     

GAOR迭代法收敛判别准则

本文将文「１」中给出的判别超松驰（即ＳＯＲ）迭代法的一个收敛性准则推广到ＧＡＯＲ迭代法，并且去掉了Ａ为不可约矩阵或／ａｉｉ／＋ｕｉ〉０（ｉ＝１，２，…，ｎ）这一条件，本文的结果所涉及的和收敛范围，均扩广交包含了文「１」中的定理。     

Gold Nanoclusters Templated by Poly-cytosine DNA as Fluorescent Probes for Selective and Sensitive Detection of Thiocyanate

Gold nanoclusters(AuNCs) were prepared in the presence of the nucleobases of poly-cytosine DNAs in this paper. We have demonstrated tliat the fluorescence of the AuNCs is quenched by thiocyanate(SCN^-) through the interaction between SCN^- and gold atoms. AuNCs can receive energy from nucleobases to boost their emission intensity, while in the presence of SCN^-, they coordinate with Au atoms and influence the energy transfer between the nucleobases and AuNCs, leading to the fluorescence quenching. The decreased fluorescence intensity was in proportion to the concentration of SCN^- in the range of 8.0×10^-7-1.5×10^-5 mol/L with a limit of detection of 4.2×10^-7 mol/L(3σ). We further validated the practice of this probe througli the detection of SCbT in natural water samples.     

充液腔体内复杂流动及其系统动力学研究

分别对旋转和非旋转充液腔体,阐述了腔内液体各种流动求解理论与实验研究的进展,简述了主要数值模拟方法的应用状况,并从系统动力学角度,讨论了充液腔体耦合系统动力学中的相关问题.     

Intramolecular nucleophilic capture of radical cations by tethered hydroxy functions

A range of systems bearing hydroxy functions tethered to the molecular framework gives rise to a family of interesting radical cations, 5⁺-11⁺, upon electron transfer to photo-excited cyanoaromatics. Geraniol (5), nerol (6), citronellol (7), chrysanthemol (8), homochrysanthemol (9), trans-1-o-hydroxyphenyl-2-phenylcyclopropane (10), and endo-5-hydroxymethylnorbornene (11), generate a series of mono-, bi-, or tricyclic ethers via a series of four- to seven-membered transition states. Two of the radical cations, 5⁺ and 6⁺, undergo tandem cyclizations where 1,5- and/or 1,6-C-C cyclizations precede nucleophilic capture.     

Study on the thermal decomposition kinetics of cis/trans-[Cu(gly)2]·H2O

The thermal decomposition reactions of the complexes cis/trans-[Cu(gly)2]· H2Owere studied by TG-DSC methods. The results showed that they have similar decomposition process, which occur in two steps. The first step is the loss of water and the second step is the decomposition of anhydrous complexes.But for cis-[Cu(gly)2]· H2O,the tempoerature of losing water is higher than that of trans-isomer. Their reaction mechanisms of the two-step decomposition were also proposed.     

关于非负矩阵Perron特征值的上、下界

本文通过构造一可逆矩阵,对一类非负矩阵A进行若干次简单的相似变换,便可同时得到矩阵A之Perron特征值的较好的上、下界.     

严格对角占优三对角矩阵逆元素的估计

本文给出了严格对角占优三对角矩阵逆元素的估计式,获得了比文[1]定理更好的结果。即:去掉了文[1]中非负这一限制条件,且使文[1]的定理成为本文定理之特例。