智能化开关柜的实现

智能开关柜将一、二次传统技术改为机电一体化技术。机电一体化技术是建立在微电子技术、信息传感技术、计算机控制技术、伺服驱动技术和精密机械技术等高新技术之上的综合技术,该技术应用在开关柜中,将大大提高金属封闭高压开关设备的安全性与可靠性,同时也提高了开关设备的智能化程度。     

碳中和背景下碳捕集、利用与封存技术专利发展研究——基于知识图谱的可视化分析

碳捕集、利用与封存（CCUS）技术被认为是未来实现碳中和目标的核心技术。本文利用CiteSpace软件对德温特专利数据库中的CCUS技术专利进行计量分析,通过知识图谱的构建,探究其专利文献的时间与空间分布,整体热点技术与前沿技术,各领域CCUS技术发展,以及其各自领域的热点技术和创新性技术。结果表明:美国和中国是CCUS技术的研究大国,中国的专利权人大多是高校机构;废气处理技术和CO2驱油技术是CCUS技术专利的热点技术;碳捕集技术中,热点技术是解吸塔技术的研究,利用含钙的化合物转化CO2为无机盐后捕集的技术是新兴领域;碳利用技术中,利用CO2生成碳纤维成为热点技术,混合利用技术是创新研究方向;碳封存技术中,罐体以及释放装置的技术专利是热点技术,不同环境中的包装技术以及运输过程中的装置发明是新的研究方向。     

用户电力技术及最新研究进展

电力技术包括发电技术、输配电技术和用户电力技术。用户电力技术突出表现为电能质量问题、节约用电问题、安全运行等问题。用户电力技术是用来解决用户电力问题的技术。就用户电力技术的概念、范围、测试评估技术、电能质量控制技术、能量转换技术及固态开关技术的最新研究情况作了简述,并对用户电力技术的实现方式提出了建议。     

西门子802Dsl系统异步子程序功能的应用

随着计算机技术和自动化技术的飞速发展,机械制造技术发生了深刻的变化,传统的普通加工设备已难以适应市场对产品多样化、高效率以及高质量的要求,而以现代制造技术为核心的数控机床是以微电子技术为基础,将传统的机械制造技术与现代控制技术、计算机技术、传感器检测技术、信息处理技术以及网络通信技术有机地结合的具有高效率、高质量和高柔...     

活用视频技术 打造灵动课堂

现代化教学中的多样化视频技术应用 视频技术大体可分为视频录制技术、视频编辑技术、视频存储技术以及视频传输／播放技术。如常用的视频技术有摄像摄影、高清技术、Premiere视频编辑、字幕制作、编码解码、DVD制作、流媒体技术、点播直播技术等。     

微电网核心技术体系研究

根据“微电网技术体系研究”的研究成果,从宏观角度介绍了微电网的定义、内涵;从微观角度给出了微电网的关键核心技术和理论框架.针对微电网所涵盖的计算与仿真技术、规划设计技术、电源技术、储能技术、运行控制技术、保护技术、接地技术、信息与通信技术、能量与管理技术、可靠性技术和电能质量技术,通过分析技术需求,提出了需要研究的核心技术和关键装备.     

开关电源电磁干扰抑制技术

讨论了一些新的开关电源电磁干扰(EM I)抑制技术,如EMI滤波器设计技术、软开关技术、共模干扰有源滤波技术、功率管优化驱动技术和扩频调制技术。分析了各EMI抑制技术的原理和设计所面临的问题。这些技术还有待进一步完善。     

单片机应用系统的抗干扰技术研究

单片机应用系统的抗干扰能力技术包括硬件抗干扰技术和软件抗干扰技术,软件技术又包括数字滤波方法、输出信号检测技术及输出端口刷新等方法。需要将软件抗干扰技术与硬件抗干扰技术进行结合,能及时有效地避免干扰的发生。因此,随着相关技术的高速发展,鉴于单片机抗干扰技术的重要性,我们更需要注重对抗干扰技术的研究。     

我国火电机组仿真技术的发展

介绍了火电机组仿真技术的发展概况,以及它在计算机网络技术、虚拟DPU技术、图形化建模技术、超临界机组的建模技术、虚拟现实技术应用等方面取得的进展、实用意义及技术关键。     

2018年能源互联网关键技术分析

新能源发电技术、大容量远距离输电技术、先进储能技术、先进信息技术等能源互联网关键技术分析,可为行业发展提供支撑。新能源发电技术 新能源不仅包括风能、太阳能和生物质能等传统可再生能源,还包括页岩气和小堆核电等新型能源或资源。新能源发电技术包括各种高效发电技术、运行控制技术、能量转换技术等。在新能源发电技术方面,研究规模光伏发电技术和太阳能集热发电技术、变速恒频风力发电系统的商业化开发,微型燃气轮机分布式电源技术,以及燃料电池功率调节技术、谐波抑制技术、高精度新能源发电预测技术、新能源电力系统保护技术;研究动力与能源转换设备、资源深度利用技术、智能控制与群控优化技术和综合优化技术。     

Engineering in genomics-combinatorial optimization in biology

The author suggests that the confidence which many biologists have in problem-solving methods is unwarranted and that there are very important limitations in almost all current methods for solving biological problems. The standard problem solving approach that computer scientists use is outlined. An example of an error in an evolutionary tree problem-the case of the African Eve-is discussed     

Thermal processes in a streamer discharge in water

The propagation features of a streamer discharge in water have been investigated. Based on the experimental data obtained in the study of water discharges in a nonuniform electric field, due propagation of streamers is explained as the evaporation of water at the tip of the streamer and around it. The energy balance in the process of the streamer propagation is calculated for a sub-microsecond discharge in distilled water. It is shown that the energy released in the pre-breakdown process is sufficient to evaporate the liquid in the streamer channels. Similar velocity of the streamer propagation in both tap and distilled water substantiates negligible effect of ionic current density onto the streamer propagation process. These estimations, based on experiment, have relevance to the discussion of the nature of the dielectric breakdown of water     

Electroluminescence in insulating polymers in ac electric fields

EL (electroluminescence) in several polymeric materials was investigated in the electric field range <90 kV/mm. We used polymeric films with semi-transparent gold electrodes: low density polyethylene, polypropylene, polytetrafluoroethylene and polyvinylchloride. The EL characteristics were very low EL inception fields (2 to 20 kV/mm) which strongly depend on the material and very low energy photon emission (mainly in the red region of 1.6 to 1.8 eV). These results reveal that EL emission occurs predominantly in the metal-polymer interface region rather than in the bulk of the polymer at the applied field. We present a model of EL emission in the metal-polymer interface region to explain our results qualitatively. In this model, the mechanism of EL emission is the radiative recombination of the electrons and holes trapped at the surface states of the polymer, which causes photon emission in the red region. The EL inception field and EL intensity depend on the density of the surface states of the polymers     

Recent progress in inverse problems in electrocardiology

The considerable progress achieved in the inverse problem of electrocardiography over the last decade has provided grounds for optimism about the possibility of approaching significant clinically relevant applications in the next decade. However, there are a number of basic questions that still remain. In addressing these questions, the authors feel it is important to seek solutions that emphasize physiological rather than mathematical significance. This approach leads to twin requirements for useful inverse solutions: accuracy, defined in a physiologically meaningful (and not just averaged and mathematical) sense, and reliability, not only to measurement noise but also to geometric modeling errors and other uncertainties that are inescapable in practical application. Studies using analytically tractable models may still be relevant, but it seems more important to find solutions to practical inverse problems, which will move the field toward wider acceptance and credibility     

University Education in Electronics in the United Kingdom

Although the overall aims of university engineering education in the U. S. A. and the U. K. are broadly similar, the means of achieving these aims in the two countries are rather different. This paper discusses teaching methods and philosophies in the Department of Electronics at the University of Southampton and compares them with attitudes in the U. S. A. First, high-school curricula in the U. K. are reviewed, as they determine the quality of students at university entry. Then, the probable future pattern of industry, and the aims of a university education are discu sed. The courses devised to train both "systems" and "device" engineers, including the all-important laboratory training, are outlined together with examination and assessment techniques. Postgraduate activities include a new type of postgraduate Master's degree course in semiconductor product technology and industrial techniques.     

Problems in the Education of Engineers in England

The paper opens with a review of the general background to engineering education in the United Kingdom, commenting on some effects of social ideas on educational institutions and their curricula. A review is made of the recent and present situations in the secondary schools, with special attention being given to the curriculum of those who subsequently continue their studies full-time in universities and colleges. The curricula in these latter institutions is then reviewed and some of the teaching problems are outlined. The paper concludes with some speculation about future trends.     

非晶态合金材料应力阻抗效应研究进展

应力阻抗效应(SI)是近年来在非晶态合金材料中发现的又一新的具有研究和应用价值的特殊物理效应,利用这种效应可以研制出高灵敏度的应力/应变传感器。简单介绍了应力阻抗效应的理论依据,分析了近几年来国内外在这方面的研究进展,主要有非晶丝、非晶带和薄膜应力阻抗效应的研究以及不同处理工艺对其应力阻抗效应的影响,适当的处理工艺引入的各向异性对应力阻抗效应的提高有很大的贡献。     

旧变电站电缆混放的改造方法介绍

旧变电站经过多年的运行和更动,无论电力电缆或控制电缆都十分凌乱,是旧变电站改造工程的一项十分困难的工作。凌乱的电缆对运行安全威胁极大,必须理顺。这里介绍惠州220kV湖滨变电站电缆改造成功的经验,供同行参考。     

Ensuring energy security in Russia in a transitional economy

The relevance of the study lies in the fact that increasing state energy consumption in the modern world leads to an increase in global energy consumption, which changes the international energy trade. The current processes determine the essence of national energy security, since for developing countries, it is important to secure national demand, guarantee export supplies and improve favourable terms of cooperation with producers and consumers. The purpose of the study is to identify and examine the factors that affect energy security of Russia in a transitional economy. In order to implement this measure, the economy and society must provide a favourable political, institutional and economic environment for the development of an innovation climate. There is particular interest in studying energy cooperation and various state projects, which reflect the link between security in general and current specialisation. The practical relevance of the study lies in the increasing importance of studying this field, which contributes to the reorganisation of new methods for global energy security that have turned out to be particularly relevant in research activities in recent years.