Molecular recognition study on a supramolecular system (VIII)

The fluorescence spectral titrations have been performed in phosphate buffer solution (pH 7.2) at room temperature to give the stability constants for inclusion complexation of a series of chemically modified β-cyclodextrins bearing aromatic groups with adamantanol. Thc molecular recognition mechanism is discussed from the viewpoint of the structural factors, electron effect of the substitutent groups and thc size and chain length of the fluorophore. The results indicate that the complex stability of the cyclodextrin derivatives bearing a positively charged pyridinio moiety can be enhanced by the electrostatic interaction between the host cyclodextrins and the adamantanol guest and the microenvironment change plays a crucial role in the inclusion complexation.     

Characteristics of self-focusing due to the pondermotive force in laser-plasma interaction

The Max’s equation of self-focusing in laser-plasma interaction due to the pondermotive force has been discussed and its physical meaning of the assumption has been predicted. The characteristics of selffocusing due to the pondermotive force with different initial situations have been analyzed through the numerical calculation. Supported by the Foundation of China Academy of Engineering Physics Zhang Yuesheng: born in 1975, Master graduate student     

野生和人工栽培窄裂缬草香精油的GC/MS分析对比研究

应用GC／MS分析对比研究野生和人工栽培香料植物窄裂缬草香精油，分别鉴定出38个和29个化合物，两种香精油其相同组分20个，主成分基本相同，为窄裂缬草开发利用建立原料栽培基地，保证其香精油工业化生产提供依据。     

关于企业重建实施途径的探讨

从介绍企业重建的产生，概念和基本思想开始，结合国有企业的实践，提出了企业重建的具体实施途径，特别是对改变组织机构进行了探讨，使组织机构扁平化，加强横向联系，以项目组的形式代替职能部门。在对职工的管理方面，提出了统一由人事部门管理，而无固定岗位的设想。同时指出，进行企业重建必须以管理信息系统作为技术支持。     

ON A CONJECTURE OF HARMONIOUS GRAPH

Let the coronas C_n⊙K_1 be the polygons with one additional end-point for eachvertex.Thom Grace conjectured that C_n⊙K_1 are harmonious for n even.In this paper,aproof of his conjecture is given.     

ON THE CALCULATION OF MESOPORE SIZE DISTRIBUTION BY THE GAS ADSORPTION METHOD

Seeing that some commercial gas adsorption instrument still uses a too rough method for cal-culation of mesopore size distribution, we reviewed some practical methods of calculation so farproposed in the literature. We have found that most of these methods and many books have someincorrectness in the geometric factor Q_i used for the calculation of pore volume △V_i from corevolume △V_i~k. It has been proved that the correct expression for Q_i should be[_i/(_i~k+1/2△t_i)]~2for cylindrical pores, _i,/(_i~k+1/2△t_i)for slit-shaped pores. On the basis of this correct Q_i,these methods were applied to the desorption isotherms. The results were compared and analyzed.     

认知发展理论视阈下的大学教学之革新

本文通过对国外大学生认知发展理论中perry的大学生认知发展阶段论进行阐释,从而对如何加强当今中国高等学校教学的科学性、有效性,避免盲目性和经验化教学提供一些借鉴性方法。     

关于正项级数判别法的讨论

给出了几种判别乘积形式的正项级数收敛性的判别方法,通过应用验证了其有效性.     

国内油田含油污水处理现状与展望

通过对国内油田含油污水常规处理技术的分析，介绍了国内油田含油污水处理的现状，论述了国内油田含油污水处理中所面临的新问题，对国内油田含油污水深度处理技术的重要发展方向进行了展望。