电子标志系统及在PE燃气管道的应用

阐述PE燃气管道的定位方式及存在的问题。介绍电子标志系统的工作原理、不同类型电子标志系统的特点与应用情况,分析了电子标志系统的经济性。从全生命周期角度考虑,电子标志系统具有使用寿命长、定位准确、可靠性高、维护便捷等诸多特点,技术成熟且具有一定的经济优势。     

地下燃气管道查找定位的方法

介绍了地下燃气管道查找定位的5种方法——纸质竣工图、地理信息系统、管道探测仪、地下电子标志系统、地表标志。     

地理信息与电子标志系统在燃气管网的应用

论述了建立城市燃气管网地理信息与电子标志系统的必要性，系统的特点，系统在实际工程中的应用情况，提出了进一步的发展构想。     

浅谈汽车发动机电控教学中的系统教学法

我国社会经济和科学技术的进步,促进了高科技技术和产品的发展。汽车作为一种时尚的标志和便利的交通工具,在世界各地得到了广泛的应用和发展。汽车发动机是汽车的重要组成部分,在电子控制教学中应用系统教学法,可以促进学生对汽车电子控制的理解和掌握。本文简述系统教学法,分析系统教学和传统教学之间的区别,提出在电子控制教学中应用系统教学法的作用。     

浅谈电子标识系统在燃气管网上的设计

文章通过电子标识系统的组成、工作原理、特征介绍，总结了电子标识系统在燃气管网设计上的要点。     

韩国大宇挖掘机电子控制系统

为提高挖掘机的综合性能，大宇挖掘机采用了先进的电子控制系统。本文较详细地介绍了大宇挖掘机的电子监控与报警系统、电子功率优化系统、自动怠速装置及工作模式电控系统的组成、电路和工作原理，同时也对ＥＰＯＳ控制器的故障自诊功能作了介绍。     

浅论电子公文传输系统在安全生产监管部门的应用需求和设计原则

随着电子政务深人展开,电子公文传输系统已得到了广泛应用。国家安全生产监管部门因独特的工作特点,对电子公文传输系统提出了特有的需求,建立在安全性等重要需求的基础上,本文提出了安全生产监管部门电子公文传输系统的设计原则,为系统的设计和研发提供了工作基础。     

建筑工程招投标中电子招投标系统的应用研究

招投标是建筑工程施工建设之前的关键阶段,在这个阶段通过开展公开、公正、公平的招投标工作,选择信誉高、质量好的承包单位,从而保障建筑工程施工质量,提高其经济效益。当前,电子招投标系统应用越来越广泛,其利用现代化多媒体信息技术,科学整合招投标业务,完善招投标流程,因此应加大对电子招投标系统对建筑工程招投标的应用研究,不断提高招投标工作的合理性和规范性。本文分析了电子招投标系统应用优势,阐述了建筑工程招投标中电子招投标系统的应用。     

建设项目电子报批系统研究与实现

建设项目电子报批是规划审批工作信息化、数字化的重要组成部分.本文首先从实施电子报批的必要性入手,详细分析了城市规划电子报批系统各阶段的设计,论述了系统的主要功能和关键实现环节,并结合实际案例说明了电子报批系统良好的实施效果.     

关于支柱产业的标志

关于支柱产业的标志江泽民总书记在党的十四大报告中、李鹏总理在第八届全国人大第一次会议的政府工作报告中都提出：振兴机械电子、石油化工、汽车制造和建筑业，使之成为国民经济的支柱产业。什么是支柱产业？国民经济支柱产业的基本标志是什么？从国内的权威著作和从国...     

浅议电子版建筑制图的标准

从图层、图线、比例、字体及字高、尺寸标注及符号等方面介绍了电子版建筑制图的一般规定，并对各图样画法作了阐述，以明确制图标准，提高建筑设计的质量和效率。     

Onsite 3D marking for construction activity tracking

This article presents an innovative onsite 3D marking approach for tracking the progress of construction activities using an Ultra Wide Band (UWB) positioning system. The 3D marking approach is used to track activities that could not be tracked previously using object-based tracking models, including welding and inspection activities for pipelines. A field experimentation study on an industrial-type building construction project was conducted to demonstrate the method and evaluate its performance in a construction environment and a software application was developed using MATLAB to automate the data analysis and progress estimation procedure. The results of the field experiments confirmed the feasibility of the developed 3D marking approach for tracking a number of construction activities, such as welding and inspection, which are not associated with the addition or movement of objects on a site and therefore could not be tracked using traditional object-based models.     

Modelling the performance of pavement marking in cold weather conditions

Inadequate and poorly maintained pavement markings are considered to be one of the largest contributing factors to fatal motor vehicle crashes. As a result, it is essential to apply the appropriate pavement marking material for all weather conditions in order to increase public safety and reduce motor vehicle crashes. Building a strategic plan to renew and re-stripe pavement marking is receiving increasing interest from companies/authorities that manage the pavement marking in order to reach the most cost-efficient management plan of the available pavement marking materials. The objective of this paper is to develop pavement marking performance models that predict the condition of different marking materials under various service conditions including weather, traffic and snow removal plans. The developed models are validated and the results show that the average percent validity varies from 87% to 99%. Marking performance is assessed using a condition rating scale, which numerically ranges from 1 to 5 and linguistically from excellent to critical, respectively. Deterioration curves are developed that assess the condition of the pavement marking based on the developed models. They are expected to benefit academics and practitioners (municipal engineers, consultants, and contractors) to prioritise inspection, stripping, and re-stripping planning for various pavement markings.     

在机械制图中合理地使用尺寸标注

介绍了标注的概念和类型,阐述了创建及修改标注样式的步骤,对编辑标注的方法进行了说明,以帮助技术人员在机械制图中合理地使用尺寸标注,从而向设计人员传达更多的设计信息。     

Modelling the effect of various factors on the condition of pavement marking

Poorly maintained pavement marking might certainly contribute to road accidents. The cost of road accidents is estimated to be 10–25 billion Canadian dollars annually. Accordingly, it is necessary for municipalities to develop a strategic cost-effective plan in order to renew and restripe pavement markings. Therefore, the objective of the present research is to model the effect of various factors on pavement marking conditions. Data on Alkyd paint pavement marking material are collected from the city of Ottawa, Ontario, Canada. Since the collected data from municipalities in Canada always include input variables and fail to provide output variable(s) (e.g. condition), an unsupervised neural network (UNN) model is first developed to generate the condition of pavement marking (output). Then, regression and neurofuzzy models are developed based upon the results of UNN model. The developed models are validated in which they show satisfactory results. A sensitivity analysis is performed to show the effect of changing the input variables on the developed models’ output(s).     

数据机房工程节能设计探讨

从数据机房节能的角度,探讨机房内的环境温度和湿度单项技术指标的确定;提出数据机房节能还应考虑机房建筑场地的几何造型,及数据机房在建筑体内的位置;探讨如何提高数据可靠性及数据机房的接地等问题。     

应用Beach marking方法检测钢结构疲劳裂纹扩展

掌握裂纹扩展规律是钢结构疲劳性能研究的一个基本问题.本文介绍了一种检测钢结构疲劳裂纹扩展的新型方法,即Beach marking方法.论文首先简述了这种方法测试疲劳裂纹扩展的基本原理,然后通过一个试验案例,展示了这种方法的具体应用和要点.试验表明这种方法简单实用,通过运用合适的疲劳荷载序列,可在疲劳断口留下疲劳弧线,从...     

Photoluminescent Stairway Installation for Evacuation in Office Buildings

Two experiments were conducted to assess the effectiveness of photoluminescent material (PLM) in support of occupant evacuation in office buildings. The first study completed in 1999 was designed to assess the potential use of PLM as a safety communication system to support office occupant evacuation. The study measured the occupant premovement time, movement time and evacuation speed in four stairways with different lighting and PLM installations. The positive outcome of the first study regarding a comparable speed of movement in the different stairways used and the conclusive feedback from the evacuees regarding the PLM wayguidance system led to a second study. The second study, completed in 2008, compared 3 stairway installations of PLM markings and a stairway with emergency lighting, which acted as a reference stairway. Results show comparable speed of movement under severe crowd conditions for the 4 stairways studied. Overall, two-thirds of the respondents felt comfortable going down the stairways with PLM markings particularly in the 2 stairways where the marking was installed across each step. The stairway, which had only emergency lighting, and the stairway with L-shaped markers at the edge of each step were less appreciated by the occupants. Occupants commented that the landings and mid-landings were difficult to identify in all the stairways, which suggest that additional marking should be provided in these areas. The findings of these two studies led to the development of a best practice Guide for installation of PLM marking in exit stairways.