Evaluating Construction Failures

Four of the construction failures the writer has investigated are reviewed. Two failures involved light framed timber trusses, one failure involved precast tees, and one involved overloaded steel floor joists. Each collapse centered around a failure to recognize the weakness of a partly completed structure. Human failure was the heart of the problem. The writer suggests greater attention to details by those responsible for construction procedures.     

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目前,由于缺少直接测量水力裂缝长度及导流能力等重要参数的手段,而地下水力裂缝的存在总要反映到油气井压力与产量的变化上来,特别是压力与产量随时间的变化速度与水力裂缝的长短、导流能力的大小等参数有直接关系。在常规压裂井试井分析过程中,所使用的数据主要是停泵后的压降数据,而岩石发生破裂到停泵前这一段压裂施工压力数据则没有得到有效利用;同时,在压裂施工作业过程中也不能对裂缝的延伸状况进行动态监测。文章提供了裂缝模型的诊断技术,通过对岩石发生破裂到停泵前这一段压裂施工压力数据进行分析,确定裂缝参数随压裂时间的变化关系。这样,就可以实时地知道裂缝发育、发展和闭合的过程,对于正确指导压裂施工作业以及获得优质裂缝具有十分重要的意义。     

From turtles to Tangible Programming Bricks: explorations in physical language design

This article provides a historical overview of educational computing research at MIT from the mid-1960s to the present day, focusing on physical interfaces. It discusses some of the results of this research: electronic toys that help children develop advanced modes of thinking through free-form play. In this historical context, the article then describes and discusses the authors own research into tangible programming, culminating in the development of the Tangible Programming Bricks system—a platform for creating microworlds for children to explore computation and scientific thinking.

坚持可持续发展战略建设矿山生态环境综合整治示范区

重点阐述了坚持可持续发展战略、建设生态环境综合示范区的意义,提出矿山生态环境综合整治示范区的内涵、建设模式和建设矿山生态环境综合整治示范区的做法。     

逆作法施工中节点的处理及质量控制

结合工程实例,介绍深基础逆作法施工中地下结构的梁、板、墙与地下连续墙连接节点的具体做法及质量控制。     

A Virtual Environment for the Design and Simulated Construction of Prefabricated Buildings

The construction industry has acknowledged that its current working practices are in need of substantial improvements in quality and efficiency and has identified that computer modelling techniques and the use of prefabricated components can help reduce times, costs, and minimise defects and problems of on-site construction. This paper describes a virtual environment to support the design and construction processes of buildings from prefabricated components and the simulation of their construction sequence according to a project schedule. The design environment can import a library of 3-D models of prefabricated modules that can be used to interactively design a building. Using Microsoft Project, the construction schedule of the designed building can be altered, with this information feeding back to the construction simulation environment. Within this environment the order of construction can be visualised using virtual machines. Novel aspects of the system are that it provides a single 3-D environment where the user can construct their design with minimal user interaction through automatic constraint recognition and view the real-time simulation of the construction process within the environment. This takes this area of research a step forward from other systems that only allow the planner to view the construction at certain stages, and do not provide an animated view of the construction process.     

价值工程在工程建设中的应用

价值工程是研究通过功能替代实现产品费用降低的方法 ,探讨了价值工程在工程建设中的应用 ,并提出了一些合理化的建议以供讨论     

实践和贯彻"三个代表"的重要思想,加快工学院建设步伐

本文主要从江泽民总书记提出的“三个代表”思想的高度出发,联系淮阴工学院的实际情况,提出如何实践和贯彻“三个代表”的思想,加快工学院建设步伐。     

以“三个代表”重要思想为行动纲领探讨新时期高校团建工作

“三个代表”的重要思想是新时期下加强党的建设的伟大纲领,本文立足于高校共青团的地位和性质,提出了“三个代表”也是高校团建工作纲领性指导文件的观点,并对如何加强、创新高校团建作了初步探讨。     

对象模式到关系模式转换的软件框架研究

数据在信息系统中的使用面临着这样一个困难,即数据存储是以关系模型为基础,而软件开发以对象模型来进行,造成了软件开发中数据访问技术的不和谐。在软件实现上陷入两种模式的转换工作,破坏面向对象语言的面向对象性,造成开发效率低下,代码重用率变低。提出并建立了一个软件框架,利用它提供的处于关系数据库和客户端之间的API来进行基于对象的数据库访问,充分发挥两种不同模式的优点,以提高软件开发的效率。