General axisymmetric active earth pressure obtained by the characteristics method based on circumferential geometric condition

Existing solutions for axisymmetric active earth pressure are based on certain hypotheses of the circumferential stress, lacking of strict basis. This article presents a technique for deriving the actual circumferential stress according to the circumferential geometric condition, the Drucker-Prager criterion and incremental theory. Based on the actual circumferential stress, a new characteristics method for determining the axisymmetric active earth pressure in plastic flow is developed in this article. In this new method, the inclined angle of boundaries, interface friction of contact interface, dilatation effect and flow velocity of soil are considered at the same time. The validity of the new method is confirmed using several sets of experimental data from the literature. The pressure coefficients are investigated individually in detail, and some different conclusions are found. Finally, a practical formula for calculating axisymmetric active earth pressure is presented based on the linear superposition principle, and related tables of coefficients are also provided for engineering application.     

核电厂主控制室任务分类的初步探讨

本文阐述了主控制室的重要性与发展要求。并对如何在先进控制室设计中实施人因工程原则进行了简单介绍。重点论述了核电厂主控制室任务分析的目的与作用、策略与方法、范围与内容，并对初步的任务分类进行了探讨。     

科技型企业如何更好地提高执行力

如何通过提高企业的有效执行力来提高企业的效益、提高企业的核心竞争力是现代企业走向市场后研究的热点与重点之一。本文通过科技型企业的发展远景与发展战略和个人发展的愿景，企业人力资源与绩效考核，和谐环境和知识工作者的贡献与作用、科技型企业的领导作用与团队建设等要素，来阐述提升企业有效执行力的几个主要问题。     

HID技术开发与应用研究

为了减轻开发者的工作量,介绍了利用HID类实现USB接口的固件程序和应用程序的编写方法,并给出了简单的应用实例。开发者可以根据自己的需要,定义不同的HID报表来传输不同格式数据,从而实现应用程序与设备的通信。     

PAT动态称重系统

本文在介绍超限超载对公路、运输市场和交通安全危害的基础上,分析了超限超载对公路危害的原理;探讨了国内外动态称重系统的发展过程,最后重点论述德国PAT公司的动态称重系统技术特点及系统集成。