Design and Realization of Zhangzhou Career Technology College Library Management System

科学技术的飞速发展把人类社会推向了一个崭新的信息时代。信息对社会经济发展的巨大推动作用，图书管理系统是高职院校不可缺少的部分，它的内容对于广大师生来说起着至关重要的作用。一直以来，我院对图书馆的管理模式是采用传统的单机操作处理，这种管理方式存在着许多缺点，如管理过程繁琐而复杂，执行效率低，并且容易出错。 基于好用、美观的原则为广大师生定制了一套图书管理系统，本系统以MicrosoftWindowsServer2003为基础，并采用MicrosoftVisualStudio2005.Net为前台开发工具，MicrosoftSQLServer2005为数据库系统。 基于广大师生对图书的借阅需求...The rapid development of science and technology has pushed human society into a new information age. The key role that information played in promoting socio-economic development has made information,energy and material serving as three pillars of modern society. College library management system is an indispensable part of educational operation, and its function for the schools is critical to both...学位：工程硕士院系专业：软件学院_工程硕士(软件工程)学号：X200723004

Progress in the study of feeding ecology in heterotrophic marineflagellates

国家重大基础研究发展项目(G2006CB4006040

带电胶体粒子弹性有效电荷测量的理论改进

According to the existing shear modulus-pair potential relationship model for colloidal crystal comprised of highly charged colloidal particles, the calculated shear moduli of colloidal crystals are much larger than the measured values by the torsional resonance spectroscopy (TRS). Moreover, by using the relationship model, the effective surface charge of colloidal particles, obtained by fitting values of shear moduli measured by TRS (effective elasticity charge), is smaller than that obtained through the experimental method of conductivity-number density relationship (effectively transported charge). So far there has been no practical explanation to this discrepancy. Our analysis shows that this discrepancy is because the existing relationship model is for the perfect crystals and does not include the defects such as voids which can result in the decrease of mechanical properties of materials. The existing shear modulus-pair potential model will be improved by introducing the effect of voids, which is inspired from the Gibson-Ashby model in the study of cellular solid. The Yukawa potential, which considers Coulomb repulsions between colloidal particles and is usually used in the model expressions, will be substituted by Sogami-Ise potential, which considers a long-range attraction in addition to that Coulomb repulsions and accepts the existence of voids inside the colloidal crystals. For five different kinds of highly charged colloidal particles, the shear moduli with different volume fractions are measured by TRS. Then the fitted effective surface charges using the original and improved model respectively are compared with each other. It can be concluded that the effective elastic charge obtained by the improved model is more suitable and much closer to the renormalized charge obtained from Alexander's method. It is also clear that neither the effectively transported charge nor the Alexander's renormalized charge can be used to evaluate the shear moduli of colloidal crystals with voids inside. These results can also let us further understand and use the effective surface charge in the colloid studies