地方高校海洋科学特色专业建设与探索

地方高校海洋科学特色专业应以海洋区域经济发展为背景,明确海洋科学专业建设目标,围绕专业特色进行课程体系、实践教学体系和课程教学的改革与探索。在特色专业建设的过程中需要着重解决好专业课程设置与培养规格的关系、教学与科研结合、教材建设和教学方式等方面的问题。     

高校商业服务设施研究

通过对大学生消费行为类型现状的分析,从规划布局、营业规格、造型及场所、交往空间、管理等方面指出了现在高校商业服务设施存在的问题,并深层次地分析了其原因,同时给出了相应的改进建议,以完善高校商业服务设施的规划设计。     

加强施工项目管理之我见

结合多年来在项目管理方面不断探索所取得的一些成功经验，主要从建章立制、生产要素配置、外部劳务管理、方案确定、过程动态控制、组织施工、成本控制、质量管理、变更索赔补差等方面分析了如何推进项目管理，提高经济效益，增强企业信誉。     

社区环境中体育健身设施设计研究

从环境的含义出发，阐述体育健身设施设计对于社区环境建设的重要意义，针对我国目前社区中体育健身设施发展的滞后现状，提出社区中体育健身设施设计的理念、内容、方法等问题，以求促进我国社区环境建设的完善。     

试论城市燃气规划和可行性研究问题

阐述了可行性研究在城市燃气规划中的重要性，详细论述了可行性研究的步骤和主要内容，探讨了可行性研究的编制原则和文件组成，指出可行性研究可以为工程项目建设提供技术、经济、商业等方面的依据，同时可以保证项目建成投产后达到预期的经济效果。     

建设监理业存在的问题及面临的挑战

分析了我国监理业现存的主要问题，通过对我国监理业的重新思考和定位，对监理业和监理工程师职责有了更深刻的认识，最后指出监理业面临的新形势，提出应转变职能，加快改革，积极应对。     

楼梯升降机简介

介绍楼梯升降机的结构、参数、特点、具体应用和选购指南。     

Numerical analysis of keyhole establishment time in keyhole plasma arc welding

Numerical analysis of keyhole shape and keyhole establishment time is of great significance for selection and optimization of the process parameters in keyhole plasma arc welding. In this paper, a three-dimensional transient model is developed to analyze the evolutions of keyhole shape and keyhole establishment time in continuous current plasma arc welding process. Firstly, a combined volumetric heat source model is used to simulate the transient variation of temperature field. And then the surfaced formation equation is adopted to calculate dynamic features of the keyhole shape and keyhole establishment time inside weld pool, in which the force action on weld pool surface is considered. Experiment is conducted to validate the numerical simulation results. The predicted keyhole size and keyhole establishment time are in agreement with the experimental measurement. And the calculated fusion zone geometry is consistent with the measured one.     

基于MB模型的简化偏振BRDF模型建立与仿真

偏振BRDF模型的计算往往非常复杂,为了简准确地获取伪装目标和背景的反射光偏振度差值,采用特殊值法和理想化方法对Maxwell-Beard BRDF模型中的微面元分布函数和遮蔽函数进行简化,使微面元分布函数较Torrance-Sparrow模型准确,较Maxwell-Beard模型更简单.然后利用Fresnel反射中物体对光线平行分量和竖直分量反射率不同的性质,采用物理理论分析的方法计算得到表示反射过程的Muller矩阵,并建立了其矢量BRDF模型.针对面内反射,利用Matlab对模型进行模拟,仿真结果证明:模型可以描述粗糙表面反射偏振特性.研究结果对研究粗糙表面反射偏振特性的影响因素及伪装目标偏振探测有一定的理论和实践意义.     

Cooperative schemes for path establishment in mobile ad-hoc networks under shadow-fading

The performance of routing protocols for multi-hop path-establishment in Mobile Ad-hoc NETworks (MANET) is examined when the individual radio links undergo shadow fading of parameterized severity. Such propagation modeling is typical of ground-level networking along with node mobility. The metrics of main interest are the probability of having a reliable multi-hop path plus the temporal statistics of such availability under a Markovian model. Such availability is an indicator for the suitability of the network to carry delay-sensitive applications (push-to-talk voice, streaming video) in uninterrupted manner. It is shown that high levels of diversity are necessary in such adverse environments, as obtained either by multiple independent paths or via concurrent cooperative transmission. Analytical and simulation comparisons of typical routing options are presented on the above metrics, plus on the required nodal engagement for supporting such diversity.