有机弱碱体系中氢型硅铝MCM-41介孔分子筛的合成及表征

以有机胺为碱源合成出硅铝介孔分子筛MCM-41,并将合成产物的性能与采用传统方法(以氢氧化钠为碱源)合成的产物进行了对比.所合成产物经焙烧脱除有机表面活性剂后即为氢型.XRD和TEM结果表明,所合成的产物骨架具有很高的有序度.固体核磁共振结果显示,铝原子以四配位的形式存在于样品的原粉中.经过高温焙烧,有少量骨架铝脱出骨架,转变成六配位形式.程序升温吡啶吸附红外光谱证明焙烧后产物具有一定的表面酸性.     

含β-二酮结构的丙烯酰类单体的聚合研究

含有β 二酮结构的烯类单体,如丙烯酰丙酮,分子中的β 二酮部分存在着酮式 烯醇式的互变异构现象［１～３］,张亦帆等对此进行了详细的研究［４］．ＣＨ２ＣＨＣＯＣＨ２ＣＯＣＨ３ＣＨ２ＣＨＣＯＨＯＣＨＣＣＨ３ＣＨ２ＣＨＣＯＨＯＣＨＣＣＨ３此类单体不同于一般...     

三硼酸锂晶体的生长形态

用自由生长系统研究了三硼酸锂ＬｉＢ_３Ｏ_５（ＬＢＯ）晶体的实际生长形态。实验表明，它的各晶面簇的重要性的顺序为：｛１１０｝＞｛０１１｝＞｛２０１｝＞｛１１１｝。讨论了ＬＢＯ晶体的生长习性与内部结构之间的关系并应用负离子配位多面体理论模型解释了ＬＢＯ晶体的生长形态。     

Studies on Cyclodextrin Inclusion Complex by Fluorescence Anisotropy

An equation for determining the equilibrium association constant (KA) of cyclodextrin inclusion complex with fluorescence anisotropy is derived and used to determine KA of pyrene-B-cyclodextrin inclusion complex. The existing forms of cyclodextrin inclusion complex in solution, the interaction type of host with guest, and the possibility of application of B-cyclodextrin in the analysis of metal ions using naphthalene derivative as a ligand are discussed based on the equation derived along with the curve of fluorescence anisotropy versus cyclodextrin concentration of guest/cyclodextrin system.     

An Electrochemical Sensor Based on Silver Nanoparticles‐Benzalkonium Chloride for the Voltammetric Determination of Antiviral Drug Tenofovir

A simple voltammetric nanosensor was described for the highly sensitive determination of antiviral drug Tenofovir. The benzalkonium chloride and silver nanoparticles were associated to build a nanosensor on glassy carbon electrode. Surface characterictics were achieved using scanning electron microscopic technique. The voltammetric measurements were performed in pH range between 1.0 and 10.0 using cyclic, adsorptive stripping differential pulse and adsorptive stripping square wave voltammetry. The linear dependence of the peak current on the square root of scan rates and the slope value (0.770) demonstrated that the oxidation of tenofovir is a mix diffusion‐adsorption controlled process in pH 5.70 acetate buffer. The linearity range was found to be 6.0×10⁻⁸–1.0×10⁻⁶ M, and nanosensor displayed an excellent detection limit of 2.39×10⁻⁹ M by square wave adsorptive stripping voltammetry. The developed nanosensor was successfully applied for the determination of Tenofovir in pharmaceutical dosage form. Moreover, the voltammetric oxidation pathway of tenofovir was also investigated at bare glassy carbon electrode comparing with some possible model compounds (Adenine and Adefovir).     

Production of Lypoglycoprotein Micelles with Arglabine Antitumor Preparation

The possible production of a new medicinal form of the antitumor preparation arglabine was studied by including it in lipoglycoprotein micelles isolated from wheat grains     

成核剂含量对β晶相聚丙烯结晶与熔融行为的影响

用DSC研究了β成核剂含量对β聚丙烯在等温与非等温结晶条件下的结晶与熔融行为的影响,发现当成核剂含量为0.005％时,结晶焓△H_c、β晶的熔融焓△H_(mβ)及熔点T_(mβ)均为最大,而α晶的相对含量最小.广角X-衍射数据表明,成核剂含量高的试样的(301)衍射峰的相对强度下降,反映分子链排列的纵向有序性降低.根据聚丙烯分子在β成核剂上附生结晶的成核机理解释了上述结果.     

LOCALIZED PATTERNS OF THE SWIFT-HOHENBERG EQUATION WITH A DISSIPATIVE TERM

In this paper, the normal form analysis of quadratic-cubic Swift-Hohenberg equation with a dissipative term is investigated by using the multiple-scale method. In addition, we obtain Hamiltonian-Hopf bifurcations of two equilibria and homoclinic snaking bifurcations of one-peak and two-peak homoclinic solutions by numerical simulations.     

关于曲线积分中值定理“中间点”渐近性的进一步结果

给出一个曲线积分学中值定理及其"中间点"渐近性分析,其结果还概括了近五年来关于积分学第一中值定理"中间点"渐近性的众多结果.     

$\delta$-拼挤流形中的2-调和子流形

We study biharmonic submanifolds in δ-pinched Riemannian manifolds, and obtain some sufficient conditions for biharmonic submanifolds to be minimal ones.