Soft-template synthesis and optical Properties of Sb2S3 semiconductor quasi-nanospheres

The reverse micelle system composed of four phases of Hexamethylene/Triton-100/n-pentanol/water (containing 1 ml 0.1 M Sb³⁺ or 1 ml 0.1 M S²⁻), which ratio is 28:3:1:1, is prepared. Sb₂S₃ quasi-nanospheres with diameters between 160 and 240 nm are synthesized by above reverse micelle soft-template system. The result shows that the fluorescence peaks have a blue shift about 19 nm when it is excited at 219 nm, and the UV–Vis absorption peaks shift about 453 nm (2.74 eV).     

非局部初值问题解的存在性定理

近来非局部问题的研究日见增多,但涉及带非线性边界条件的初值问题文献 较少.本文目的在于证明一个半线性方程的齐次边值问题和一个非线性边界条件问题 解的存在性.主要使用半群,分数次幂函数空间,广义Poincare算子等工具.     

含全氟烷基香豆素的合成及其结构表征

间位取代苯酚与全氟炔酸酯或三氟乙酰乙酸乙酯在不同条件下反应生成全氟烷基香豆素. 通过对该化合物的¹H NMR、¹³C NMR、¹³C-¹H COSY及IR、MS的分析，归属了各NMR谱线，对相关化合物进行了结构确证，同时对反应机理进行了推测.     

一类最优投资随机控制模型的马氏链算法

现代金融经济中的很多问题可以构建成随机控制模型,而随机控制的求解却存在一定的困难.马氏链算法应该是一种有效的求解随机控制问题的数值方法.本文以Claus Munk的工作为基础,针对一类最优投资模型,具体确定了马氏链的转移矩阵并证明其满足算法收敛条件,并用MATLAB语言编成一个程序实现.     

求全局最优解的新算法

利用局部极大值点与动力系统的稳定奇点的对应性，计算代数方程的根、无约束极大值点、有约束极大值点、非线性规划解、及最小二乘解．我们采用了常微分方程数值解的Euler算法及网格初始点的循序迭代算法，并以具体的例子和程序说明创立的方法具有通用性，同时考虑了一些存在的问题以便在理论和算法上作进一步的改进。     

Schiff 碱双核配合物的磁性及催化性能的研究

This paper reports the catalytic properties of “porphyrin-like” Schiff base mononuclear complexes MH₂L {M=Mn(Ⅱ), Fe(Ⅲ)Cl, Cr(Ⅲ)Cl, Cu(Ⅱ), Co(Ⅱ), Ni(Ⅱ), Zn(Ⅱ); L=bis[N, N′-ethylene-2, 2′-(phenylmethylene)bis(3,4-dimethylpyrrole-5-aldimino)]} and dinuclear complexes MnML [M=Mn(Ⅱ), Fe(Ⅲ)Cl, Cr(Ⅲ)Cl, Cu(Ⅱ), Co(Ⅱ), Ni(Ⅱ), Zn(Ⅱ)] for cyclohexane monooxygenation with PhIO and magnetic properties of the dinuclear complexes. The magnetic investigations (4～300 K) of the dinuclear complexes revealed that their antiferromagnetic spin exchange with J ranged from -10.49 to -0.482 cm^-1 except MnZnL and antiferromagnetic spin exchange decreased in the following order: Mn^Ⅱ-Cu^Ⅱ > Mn^Ⅱ-Ni^Ⅱ > Mn^Ⅱ-Mn^Ⅱ > Mn^Ⅱ-Fe^Ⅲ > Mn^Ⅱ-Co^Ⅱ > Mn^Ⅱ-Cr^Ⅲ. The results of catalyzed oxidation of cyclohexane indicated that the catalytic property of the dinuclear complex was better than that of the corresponding mononuclear complex. It was found that there was the synergism decreased in the order: Mn-Fe > Mn-Cr > Mn-Cu > Mn-Mn > Mn-Co> Mn-Ni > Mn-Zn. It seems that this synergism increases with the increase of the number of unpaired d electrons and the magnetic exchange between the two metals in these dinuclear complexes.     

One-pot three-component reaction of C60, amino acid and fluorinated benzaldehyde to C60-pyrrolidine derivatives

A series of fluorinated 2,5-disubstituted C₆₀-pyrrolidine derivatives were synthesized via one-pot three-component reaction of C₆₀, amino acid and fluorinated benzaldehyde under reflux in toluene or microwave irradiation. The cis- and trans-isomers could be isolated by chromatography and fully confirmed by ¹H NMR.     

一氯二茂钛在有机合成中的应用研究

综述了近年来一氯二茂钛在有机合成中的应用研究, 主要涉及环氧化物的还原开环、其它还原反应、Reformatsky反应、呐醇偶联反应、不饱和金属卡宾与自由基的加成反应、制备烯糖化合物的反应、制备C-苷的反应等.     

一种守恒型间断跟踪法在一维单守恒律方程上的程序实现

茅在近几年发展了一种守恒型的间断跟踪法（见[6],[7]），该跟踪法是以解的守恒性质作为跟踪的机制而不是传统的跟踪法利用Rankine-Hugoniot条件。本文的目的是对该算法在一维单守恒律的情况进行程序实现，做成一个对任意初值问题都适应的强健的算法，可处理任意的间断相互作用。在文章的第三节给出了一个数值算例，并与用ENO格式（见[8]所算得的结果进行比较。     

Solidification behavior of indium droplets embedded in aluminum by differential fast scanning calorimetry

Journal of Thermal Analysis and Calorimetry - Indium droplets embedded in aluminum matrix were successfully prepared by melt spinning technique. The results showed that an amount of nano-sized...