国产数字式电子调速系统的配机应用

本文介绍了国产ＥＥＣＳ－Ｄ数字式电子调速器的基本结构和配机应用概况．事实表明,技术趋于成熟的国产数字式电子调速系统具有明显的性能价格比优势和潜在的广阔市场前景．     

“L”级电子镇流器、电子节能灯简介

为适应节能工作的要求 ,2 0世纪 90年代初 ,武汉节能技术服务中心、武汉市九州能源技术综合开发公司 ,积极响应国家绿色照明领导小组的号召 ,投入人力和资金进行荧光灯电子镇流器和电子紧凑型节能灯的开发。Ｈ级电子镇流器 1993年投入生产 ,Ｈ级电子节能灯 1995年投入生产。据我们掌握的信息 ,目前 ,我国大部分电子镇流器和电子节能灯都处于Ｈ级水平。Ｈ级电子镇流器和电子节能灯为开辟我国照明节电新途径立下了汗马功劳。但是Ｈ级电子镇流器、电子节能灯由于自身电路限制 ,对国家标准中严格规定的电流谐波和电流波峰比限值是难以达到的。因…     

电力电子技术——当代“节电之魁”

<正> 电力电子技术是介于电力、电子、控制之间的边缘技术,是电子(弱电)控制与被控电力(强电)之间的接口技术,是机械—电子—信息一体化的结合技术,是改造传统产业的高新技术,是发展高技术新兴产业的支持技术和基础技术。特别是以功率集成器件为基础的现代电力电子技术,是微电子技术与以普通晶闸管     

谈如何加强对电子图档的管理

本文就企业如何加强对CAD电子图档的管理,特别是更改管理及图档管理类软件应有的主要功能等进行了有益的探讨.     

无功功率补偿装置的改进

本文介绍一种计算机控制的工厂供电系统的无功功率补偿装置,它包括一种大功率的无冲击电流的硅可控开关,用以通、断电容器电路,这种设备具有高可靠性、长寿命的特点,达到节电的目的.     

汽油机电子控制单元(ECU)的开发

介绍了自行开发的汽油机电子控制单元（ECU）的总体设计构成与功能。从硬件和软件两个方面对ECU进行了分析,内容包括ECU中传感器和执行器的接口电路特性、微控制器的工作原理与要求,特别是控制策略。对新开发的ECU进行了与HH368-1E型发动机台架匹配和整车部分匹配的试验研究。试验结果表明：整车排放指标满足GBl8352．1—2001和GBl8352．2—200l法规要求,同时动力性、经济性和瞬态性能达到原机水平,验证了所开发的ECU适用于中小型车用汽油机的电子控制系统。     

国外治理电子垃圾的经验

随着经济的发展,环境问题越来越严峻,尤其是电子垃圾问题,已经引起了社会的广泛关注.借鉴国外的经验,对于我国在电子垃圾治理过程中推行循环经济的理论和实践模式具有重要的现实意义.     

基于MC9S12DP256的柴油机电子调速器的开发

应用现代电子控制技术对常规的喷油泵用机械调速器进行了改进,设计了一种基于16位单片机MC9S12DP256的柴油机电子调速系统。文中给出了该系统的硬件总体结构设计思想和软件设计流程。并详细介绍了以智能PID控制算法为核心的控制策略。实验证明整个系统具有可靠性高,响应速度快等优点。     

90年代柴油机的组合式电子喷油器

<正> 目前,Lucas柴油机系统公司正步八组合式电子喷油器(EUI)的批量生产阶段。按照一个新的发动机计划,Lucks将为美国一家柴油机主导厂提供这种喷油器。在仔细考察这种喷油器之前,先考察一下柴油机供油方面的总趋势。70年代初,柴油机研究人员预示,EUI在90年代重型柴油机上即使起不到主导作用,也将起到重要作用。这一预测看来正在变成现实。当然,主要的推动力来自于待实施的排放标准。对于EUI,其特有的高喷射压力是一大优点。EUI还能很好地与发动机电子控制系统配合,这又带来另外一些好处。 EUI能在所有负荷和转速工况下完全按正时图进行正时控制,在冷起动时具有优异的碳烟控制能     

双燃料发动机电控系统的开发研究

本文对所开发的双燃料发动机电控系统硬件结构,软件模块,控制方式及用途作了详细介绍。并预测了该技术的运用前景。     

New capability of graphene as hydrogen storage by Si and/or Ge doping: Density functional theory

We studied the adsorption of water molecules via the density functional theory on the pure and silicon and/or germanium doped graphene. We investigated the electrostatic surface potential of the structures to predict the possible interactions. Also, we examined the interaction between every possible side of the water molecule and possible sites of the pure and doped graphene. There was no interaction between the water molecule and the graphene. The only interaction was between the oxygen atom of the water molecule and the doped atoms. We also studied the decomposition of the water molecule on these doped graphene sheets and the possible intermediates and transition states and reaction pathway for the decomposition process. We calculated the interaction energies for the adsorption steps and the thermodynamic parameters for all steps of reaction pathway. The results showed that the adsorption of the water molecule on silicon and/or germanium doped graphene. Also, the decomposition of one of the hydrogen atoms of water molecule was thermodynamically favored at room temperature.     

屋顶绿化的功能及应用现状

介绍屋顶绿化具有城市建筑节能、环境保护等多种功能,通过对国内外屋顶绿化的发展及应用现状概述,着重分析轻型屋顶绿化技术与作用,为推广轻型屋顶绿化提供理论依据,在城市建设与建筑节能领域具有一定的实用价值和理论意义。     

Research progress on hydrate plugging in multiphase mixed rich-liquid transportation pipelines

The plugging mechanism of multiphase mixed rich-liquid transportation in submarine pipeline is a prerequisite for maintaining the fluid flow in the pipeline and ensuring safe fluid flow. This paper introduced the common experimental devices used to study multiphase flow, and summarized the plugging progress and mechanism in the liquid-rich system. Besides, it divided the rich-liquid phase system into an oil-based system, a partially dispersed system, and a water-based system according to the different water cuts, and discussed the mechanism of hydrate plugging. Moreover, it summarized the mechanism and the use of anti-agglomerates in different systems. Furthermore, it proposed some suggestions for future research on hydrate plugging. First, in the oil-based system, the effect factors of hydrates are combined with the mechanical properties of hydrate deposit layer, and the hydrate plugging mechanism models at inclined and elbow pipes should be established. Second, the mechanism of oil-water emulsion breaking in partially dispersed system and the reason for the migration of the oil-water interface should be analyzed, and the property of the free water layer on the hydrate plugging process should be quantified. Third, a complete model of the effect of the synergy of liquid bridge force and van der Waals force in the water-based system on the hydrate particle coalescence frequency model is needed, and the coalescence frequency model should be summarized. Next, the dynamic analysis of a multiphase mixed rich-liquid transportation pipeline should be coupled with the process of hydrate coalescence, deposition, and blockage decomposition. Finally, the effects of anti-agglomerates on the morphological evolution of hydrate under different systems and pipeline plugging conditions in different media should be further explored.     

过热器再热器爆漏事故的原因分析及对策

过热器、再热器爆漏事故严重影响了锅炉机组的安全性和经济性,而造成过热器、再热器爆漏事故的主要因素有超温爆管、磨损、高温腐蚀、热疲劳、质量失控等。通过对这些因素的主要原因和爆口特征的分析,提出了一些过热器、再热器爆漏事故的防治措施。     

Energy use in Indian household sector – An actor-oriented approach

Over the years, significant changes have taken place with regard to the type as well the quantity of energy used in Indian households. Many factors have contributed in bringing these changes. These include availability of energy, security of supplies, efficiency of use, cost of device, price of energy carriers, ease of use, and external factors like technological development, introduction of subsidies, and environmental considerations. The present paper presents the pattern of energy consumption in the household sector and analyses the causalities underlying the present usage patterns. It identifies specific (groups of) actors, study their specific situations, analyse the constraints and discusses opportunities for improvement. This can be referred to “actor-oriented” analysis in which we understand how various actors of the energy system are making the system work, and what incentives and constraints each of these actors is experiencing. It analyses actor linkages and their impact on the fuel choice mechanism. The study shows that the role of actors in household fuel choice is significant and depends on the level of factors – micro, meso and macro. It is recommended that the development interventions should include actor-oriented tools in energy planning, implementation, monitoring and evaluation. The analysis is based on the data from the national sample survey (NSS), India. This approach provides a spatial viewpoint which permits a clear assessment of the energy carrier choice by the households and the influence of various actors. The scope of the paper is motivated and limited by suggesting and formulating a powerful analytical technique to analyse the problem involving the role of actors in the Indian household sector.     

A primary study on a long-term vision and strategy for the realisation and the development of the Sahara Solar Breeder project in Algeria

Energy security, economic growth and environmental protection are the national energy policy drivers of any country of the world. Scientists, governments, and industries are witnessing the long-term consequences of energy consumption and foresee catastrophic outcomes if alternative methods of energy production are not developed and utilised to meet the needs of our global economy. In recent years, PV is proposed as a competitive energy policy and a step forward to the target of sustainable development and environmental friendly energy source. In this contribution a particular attention is being given to the joint event that bring together the relevant parties, the University of Sciences and Technology of Oran (USTO), Japan International Corporation and Japan Science and Technology Agencies (JICA, JST) to develop a long-term vision and strategy to boost the ideas for the realization and the development of the Sahara Solar Breeder (SSB) project. SSB advocates the view of undertaking collaborative basic, applied and development research, as well as industrial production and technical, commercial and financial support services to implement photovoltaic solar energy systems. The strategic objective is the establishment of a Global Clean Energy Superhighway as the solution to global energy challenges, water shortages, levelling of electric power supply in the world, climate change and other environmental problems arising from the current fossil-fuel heavy global energy paradigm [1]. This project will tackle the key challenges and issues related to the field of PV putting forward the USTO perspective and promoting its R/D activities by a collaborative research plan between Japan and Algeria. This event also seeks to identify the most important challenges facing both the research and economic sectors and put forward new strategies that will identify the required skills to transform the research prospects of USTO based on the analysis and prospect of elementary processes and system design.     

徐楼闸深厚粉细砂闸基防渗防冲方法及处理效果

鉴于徐楼闸老闸因闸基渗透、上下游冲刷而损坏,移址改建的徐楼闸新闸必须解决闸基深厚粉细砂层渗透能力强、不耐冲刷的问题,采用闸基换填水泥土、闸基设置截渗墙、下游消力池末端设置防冲墙等加固补强措施,就可有效减弱粉细砂的渗透问题,并可有效提高闸基的抗冲能力,从而确保闸基稳定安全运行。     

亚临界锅炉集箱水压试验工艺

本文主要阐述了亚临界锅炉集箱水压试验的难度及解决方案 ,如集箱上小管接头、大管接头密封问题 ,集箱上三通、弯头、敞口集箱的密封问题 ,水压试验场地问题 ,集箱水压后三通、弯头、敞口集箱的机加问题 ,制造成本和生产周期问题。此项研究的成功 ,使我公司的集箱制造水平有了很大的提高 ,保证了所有集箱焊缝不泄露 ,使我公司的产品质量进一步得到用户的认可