A new approach to the facile synthesis of 2-substituted-quinazolin-4(3H)-ones

A new approach to the facile synthesis of 2-substituted-quinazolin-4(3H)-ones and its derivatives using the condensation reaction of substituted 2-aminobenzamide and orthoesters is reported.     

Microstructural Characterization of V-Defects in InGaN/GaN Multiquantum Wells

JETP Letters - InGaN multiple-quantum-well (MQW) structures grown by metal-organic chemical-vapor deposition (MOCVD) are found to contain V-defects attached to threading dislocations. The nature of...     

Pyrroloquinoline quinone glucose dehydrogenase adopted in thermometric analysis for enhancement of glucose determination

Journal of Thermal Analysis and Calorimetry - In this study, a new Schiff base ligand [2-{[4-amino-5-(3,4,5-trimethoxy-benzyl)-pyrimidin-2-ylimino]-methyl}-6-methoxy-phenol, C22H24N4O5] and its...     

大孔PMVBS树脂对茶多酚的吸附研究

茶叶在我国具有丰富的自然资源,饮茶及茶文化在我国已有数千年的历史.茶不仅具有提神解渴的功效,而且富含具有保健、药效功能的茶多酚(Tea Polyphenols TP).茶多酚,又名茶单宁,是一类多羟基酚类有机物.     

带p—Laplacian算子三点边值问题拟对称正解的多重性

应用Avery—Peterson不动点定理,讨论了一类带p-Laplacian算子三点边值问题在非线性项,依赖于未知函数的一阶导数的情况下拟对称正解的多重性,得到了这类边值问题至少存在三个拟对称正解的充分条件．     

一种基于函数值的二元有理插值函数及其性质

利用带参数的仅以被插函数的函数值作为插值条件的一元有理插值方法,构造了一种分母为双二次的仪基于函数值的二元有理双三次插值函数,插值函数具有简洁的显示表示,插值函数中含有四个参数,当这些参数满足一定条件时,插值曲而在插值区域上C1光滑.由于插值函数中含有参数,这样可以在插值数据不变的情况下通过对参数的选择进行插值曲面的局部修改,最后讨论了插值函数的一些性质.     

Almost periodic solutions of recurrent neural networks with continuously distributed delays

In this paper, a class of recurrent neural networks with continuously distributed delays is discussed. Without resorting to the theory of exponential dichotomy, several new sufficient conditions are obtained ensuring the existence of an almost periodic solution for this model based on a special functional and analysis technique. Moreover, by constructing suitable Lyapunov functions, the attractivity and exponential stability of the almost periodic solution are also considered for the system. The results obtained are helpful to design globally stable almost periodic oscillatory neural networks. A numerical example is given to show the feasibility of the results obtained.     

化学师范专业学生职业素养调查研究

以衡阳师范学院化学专业的学生为调查对象,对化学师范专业学生职业素养进行了调查研究.调查结果表明,化学师范专业学生敬业精神有待提高,职业规划有待明确,专业基本能力偏低,创新精神和个性意志仍待提高.针对调查结果,论文提出了相应的建议.     

Analytical solution for a strained reinforcement layer bonded to lip-shaped crack under remote mode Ⅲ uniform load and concentrated load

In this paper,the analytical solution of stress field for a strained reinforcement layer bonded to a lip-shaped crack under a remote mode Ⅲ uniform load and a concentrated load is obtained explicitly in the series form by using the technical of conformal mapping and the method of analytic continuation.The effects of material combinations,bond of interface and geometric configurations on interfacial stresses generated by eigenstrain,remote load and concentrated load are studied.The results show that the stress concentration and interfacial stresses can be reduced by rational material combinations and geometric configurations designs for different load forms.