蜂窝移动通信系统频率复用方案探讨

为了解决频谱资源不足的问题,并在扩大用户容量问题上获得重大的突破,提出了蜂窝的概念。论述了频率复用思想的具体方案,探讨了提高蜂窝性能的方法。     

论网络传播的十大特征

信息时代的明显特征是网络的出现和发展。相对于三大传统传播媒体即报纸、广播、电视而言,网络有着自己的鲜明特征,因而又被称为“第四媒体”,并着重论述网络传播的十大特征。     

Developing professionally: examining the value of an external agent to the professional growth of teachers experimenting with mobile digital technologies

This article presents and discusses findings related to the relationship between a university researcher acting as the external agent and three self-selected teachers involved in a professional learning and research project. The role of an external agent in supporting teachers’ professional development is of interest because it has not always been a role that has benefited teachers. The focus centres on how these three teachers viewed this role at the end of a two-year partnership. The wider project is centred on developing these teachers’ proficiency and knowledge of the value of iPads to both their own professional growth and classroom practices as well as their students’ learning. Some digital aspects of the project have already been addressed by Wright and colleagues, but not the perceptions of teachers regarding what value they put on the external agent role. Bevins and Price’s conception of school/university partnerships inspired this focus on wondering about the impact of the researcher acting as an external agent intersecting with teachers’ professional lives as we tracked their progress in using the iPads.     

多孔介质发动机详细反应动力学模型

应用Chemkin化学动力学软件包中的Senkin模块模拟了正庚烷在多孔介质发动机中的燃烧过程．通过修改Senkin程序,结合了Woschni传热模型和多孔介质换热模型,并在正庚烷详细氧化机理中加入氮氧化物的生成机理,将此程序纳入发动机燃烧的零维单区模型．对多种工况参数进行计算,讨论了运行参数对发动机性能的影响．当进气温度、压缩比增大,或过量空气系数降低时,多孔介质发动机着火时刻会明显提前．结果表明：多孔介质对混合气具有预热作用可强化发动机的点火燃烧,多孔介质的初始温度是决定压燃点火的决定性因素．     

浅析中职学校心理健康教育

教育要以人为本,人的根本是身心健康,在学校教育中开展心理健康教育是很重要的,我们要从营造优美文明的校园环境,提高教师心理素质,提供心理辅导,开设有关心理健康课程,争取家长的的支持和认可等方面入手,调动全社会的力量,为广大中职生普及心理健康基本知识,让他们了解和掌握心理保健常识和简单的心理调节方法,知晓学习、人际交往、升学择业以及生活和社会适应等方面的知识,以期让学生拥有丰富的心灵、健全的人格,能快乐、健康地成长。     

Mathematical treatment of wave propagation in acoustic waveguides with n curved interfaces

There are some curved interfaces in ocean acoustic waveguides. To compute wave propagation along the range with some marching methods, a flattening of the internal interfaces and a transforming equation are needed. In this paper a local or-thogonal coordinate transform and an equation transformation are constructed to flatten interfaces and change the Helmholtz equation as a solvable form. For a waveguide with a flat top, a flat bottom and n curved interfaces, the coefficients of the trans-formed Helmholtz equation are given in a closed formulation which can be thought of as an extension of the formal work related to the equation transformation with two curved internal interfaces. In the transformed horizontally stratified waveguide, the one-way reformulation based on the Dirichlet-to-Neumann (DtN) map is then used to reduce the boundary value problem to an initial value problem. Numerical implementation of the resulting operator Riccati equation uses a large range step method to discretize the range variable and a truncated local eigenfunction expansion to approximate the operators. This method is particularly useful for solving long range wave propagation problems in slowly varying waveguides. Furthermore, the method can also be applied to wave propagation problems in acoustic waveguides associated with varied density.     

基于微信小程序的学生成绩信息查询系统研究与设计

微信小程序以其体量轻小,无需安装、卸载,触手可及、用完即走的技术创新,越来越多地被应用于不同场景中。借助微信小程序,结合PHP语言、MySQL数据库、Json数据等技术设计与开发一套学生成绩信息查询系统,能够实现高校学生成绩信息的便捷、实时查询。     

风险社会和移动互联网时代的舆情表达与政府回应

风险社会和移动互联网时代的舆情表达体现出许多新特征,尚未完全适应此种变化的政府回应时不时地陷入困境。只有通过理顺政府内部关系、健全信息公开制度、引导社会力量参与等,才能有效解决政府回应困境,建构政府与民众之间的良性互动关系。     

中小企业竞争情报研究

本文阐述了竞争情报在中小企业中开展的现状,中小企业竞争情报系统的作用,中小企业竞争情报需求的特点,提出了发展中小企业竞争情报的对策。     

中小企业技术创新可持续发展的途径

首先对中小企业技术创新可持续发展的内涵进行界定，在分析了影响中小企业技术创新可持续发展因素的基础上，提出了中小企业技术创新可持续发展的途径。