绝缘子在偏心冲洗时有效冲洗面积的研究

带电水冲洗在绝缘子的清洗作业中得到了大量的运用,因此进行带电水冲洗的相关研究就显得十分必要。论文通过理论分析计算出颗粒脱附所需的临界速率,利用fluent对绝缘子在小水、中水、大水的冲洗方式下的偏心冲洗进行三维仿真计算,根据仿真所得到的绝缘子表面的剪切应力云图,对比绝缘子在不同压力、不同的水平偏转角以及不同冲洗方式下有效冲洗区域的大小,同时对比了在相同压力下有效面积与流量的比值,以此来比较水的利用率。结果表明:利用小水和中水的冲洗方式对绝缘子壁面进行冲洗时,随着喷嘴水平偏转角度的增大,有效冲洗面积先增大然后减小;且随着压力的增大,有效冲洗面积的随偏转角度变化的转折点更靠近小的水平偏转角度;而大水冲洗方式下有效冲洗面随着水平偏转角度的增大而持续减少。     

变电站带电水冲洗机器人开放式控制系统

为了解决人工水冲洗变电站设备的问题, 文中介绍了一种新型的变电站带电水冲洗移动机器人及其开放式控制系统结构体系. 首先, 介绍了变电站带电水冲洗移动机器人总体设计, 然后, 给出了该机器人开放式控制系统结构体系. 变电站带电水冲洗移动机器人采用基于PC机、触摸屏和运动控制器的开放式控制系统, 提高了控制系统的开放性和交互性能; 基于分层递阶控制的思想, 将控制系统划分为组织级、协调级和执行级三个层次, 通过各层的配合保证了运动控制算法的实时性和各子系统的协调工作.     

一种用于输电线路更换导地线作业的防护网研发

输电线路更换导地线作业过程中,通常采用防护网作为保护措施,为解决防护网作业过程中人工作业高空导线攀爬挂接,效率低、劳动强度大且作业风险高等困难,文章开发了相应的V型非张力跨网和自动收网装置。自动收放网装置可避免作业人员在高空导线来回走动,减少作业人员在高空作业的工作量,降低作业风险,提高作业效率和安全性。     

基于虚拟现实技术和智能机器人的变电站巡检功能研究

基于虚拟现实技术的机器人能够在变电站的带电检修作业开展中发挥巨大的技术优势,像带电断线、带电线路杂物清理、线路保险更换等,都可以为变电站巡检效率的不断提高提供可靠的保障.智能机器人在变电站巡检过程中携带拾音器、红外摄像仪等,在实际的操作中有利于及时地发现变电站相关设备使用过程中存在的缺陷,有利于技术人员快速地消除其中存在的安全隐患,最大限度地保证了生产设备长期处于稳定、高效的工作状态.基于此,对基于虚拟现实技术及智能机器人的变电站巡检功能进行了研讨.     

电力设备综合带电检测管理信息系统的研究

带电检测逐渐应用于移动作业平台,通过研究电力系统安全接入平台的技术原理及其终端接入方式,提出了基于PC终端安全接入方式的电力设备综合带电检测管理信息系统架构方案,采用3G接入方式解决电力系统内网信息阻隔问题,实现现场终端与内网业务系统的数据交互,通过计算被测设备检测指标的正常率综合判断被测设备的健康状态.系统能有效规范现场工作流程,提高带电检测技术在电力系统的应用水平.     

带电处理导地线异物新型除障器的研制

目前在带电处理35～220kV线路导地线异物作业中存在因除障工具性能不足而出现复杂异物无法处理而不得不进行停电处理的现象，导致供电可靠性降低，作业风险增加。本文重点围绕解决带电处理导地线异物时出现的不足而研制出一种带电处理导地线异物的新型除障器，实现改进作业中的不足，避免停电处理，提高带电处理异物效率的目的。     

干放站运行自动检测设计与应用

在有线电视网络中干线放大站数量多,距离远,并高空架设,当维修检测时须带电测试危险性大,因此,在教学实践中提出了一种对设备运行自动检测方案,同时介绍了硬、软件结构等.     

断路器、隔离开关高处作业防坠落装置

通常情况下,断路器、隔离开关的安全检修都需要开展高处作业,且在具体作业过程中,作业人员还需要不断变换位置,朝各个方向移动,导致其在作业中面临较大安全隐患。当前,高处作业人员会采用安全带作为防坠落装置,但这会限制作业人员的活动范围,导致作业无法开展,大大降低了作业效率。有些作业人员为了完成工作,甚至会将安全带解开进行高空作业,一旦发生高空坠落,作业人员的生命将会受到威胁。为了更好解决这一问题,需要研制一种更有效的高处作业防坠落装置,以保障作业人员开展高处作业时的生命安全。     

热网循环泵机械密封冲洗水源改造过程的研究

我司热网循环泵密封为机械密封,型号为M74N-140,在轴间与旋转环构成极薄的液态膜,以避免介质发生泄漏。机械密封设计了机封冲洗水,用于冲洗、冷却机械密封,冲洗水由电厂闭式水提供。但设计参数与实际运行状况不符,实际运行时热网循环泵入口压力大于闭式水泵出口压力,导致热网循环水反串回闭式水系统,造成闭式水水质的恶化,以及机封冲洗水的作用失效。经多次整改,将机封冲洗水水源引自热网循环泵出口,改为自密封形式,彻底解决了机封冲洗水设计不合理的问题。     

电力设备综合带电检测技术车载化应用研究

带电检测技术已在电力系统得到广泛应用,但现有带电检测模式存在设备分散、效率低、智能化水平低等缺点。本文研究设计了一套带电检测技术车载化应用系统,该系统能够实现检测设备和辅助设备的车载化,有效提高带电检测效率。     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。