A market-based approach for enabling inter-area reserve exchange

Considering the sequential clearing of energy and reserves in Europe, enabling inter-area reserve exchange requires optimally allocating inter-area transmission capacities between these two markets. To achieve this, we provide a market-based allocation framework and derive payments with desirable properties. The proposed min-max least core selecting payments achieve individual rationality, budget balance, and approximate incentive compatibility and coalitional stability. The results extend the works on private discrete items to a network of continuous public choices.     

G-M制冷机的电气控制与保护

G-M制冷机广泛应用于微电子技术、激光和电子设备、材料科学等技术领域。文中主要对G-M制冷机电源断相和电流过载、气体压力、冷凝温度等方面的自动控制与保护进行研究,提出了一系列保护措施,从而确保G-M制冷机的启动、制动和稳定运行。     

地测远程管理信息系统在煤炭企业中的应用

以西山煤电集团公司为例,简述了地测远程管理信息系统的基础和原理,重点介绍了系统的模块、功能和关键技术.     

总线式楼宇防火防盗报警系统应用

介绍了防盗防火系统在各种场所中的应用，以及该系统的组成，该系统采用民用电力线，除可完成智能防火、防盗、自动拨号报警功能外，还可实现定时打铃、楼内电力载波电话等功能。     

Regime switches induced by supply-demand equilibrium: a model for power-price dynamics

Regime-switching models can be used to describe stochastic movements of electricity prices in deregulated markets. This paper shows that regime-switching dynamics arise quite naturally in an equilibrium context in which the functional form of the supply curve is described by a two-state Markov process. This mechanism is responsible for random switches between regimes and it allows one to describe the main features of the price-formation process. With the interplay between demand and supply, the proposed methodology can be used to capture shortages in electricity generation, forced outages, and peaks in electricity demand. As an example of application, a two-regime model specification is proposed, and it will be shown that the empirical analysis, performed by estimating using the model on the California power market, offers an interesting agreement with observed data.     

Learning Electricity with NIELS: Thinking with Electrons and Thinking in Levels

Electricity is regarded as one of the most challenging topics for students of all ages. Several researchers have suggested that na?ve misconceptions about electricity stem from a deep incommensurability (Slotta and Chi 2006; Chi 2005) or incompatibility (Chi et al. 1994) between na?ve and expert knowledge structures. In this paper we argue that adopting an emergent levels-based perspective as proposed by Wilensky and Resnick (1999), allows us to reconceive commonly noted misconceptions in electricity as behavioral evidences of “slippage between levels,” i.e., these misconceptions appear when otherwise productive knowledge elements are sometimes activated inappropriately due to certain macro-level phenomenological cues only. We then introduce NIELS (NetLogo Investigations In Electromagnetism), a curriculum of emergent multi-agent-based computational models. NIELS models represent phenomena such as electric current and resistance as emergent from simple, body-syntonic interactions between electrons and other charges in a circuit. We discuss results from a pilot implementation of NIELS in an undergraduate physics course, that highlight the ability of an emergent levels-based approach to provide students with a deep, expert-like understanding of the relevant phenomena by bootstrapping, rather than discarding their existing repertoire of intuitive knowledge.

不同电性Gemini表面活性剂界面扩张性质

利用Langmuir槽法研究了含聚氧乙烯醚链中间链的两性Gemini表面活性剂C8E4NC12、阳离子Gemini表面活性剂C12NE3NC12和阴离子Gemini表面活性剂C8E4C8在空气/水表面和癸烷/水界面上的扩张性质,考察浓度对3种Gemini表面活性剂溶液表、界面扩张性质的影响.结果表明,由于分子间存在库仑引力,两性Gemini分子表现出较高的扩张弹性和粘性,且界面扩张性质类似于表面.对于有相同电荷Gemini分子,C8E4C8分子中的刚性苯环导致其疏水长链在表面上的取向不同于C12NE3NC12分子,两者表现出不同的表面扩张性质;而油分子能改变同电荷Gemini分子中长链烷基的取向,造成其界面扩张弹性和粘性远低于表面.提出了不同电性Gemini分子在界面排布的示意图,并利用弛豫过程的特征参数进行了验证.     

我国配电系统及其自动化技术的探讨

本文分析了我国配电系统现状及其自动化技术的发展的过程，提出了我国在信息化的基础上实现配电系统及其自动化的对策。     

电模拟平面径向流理论在实际运用中几个问题的探讨

本文探讨了利用水电模拟原理,电模拟平面径向流理论在实际运用中存在的问题。分析了水电两种流动介质的流动特性,通过理论探讨和实验,揭示了存在问题的原因,提出了电模拟和平面径向流中各参数(供给半径,导电液浓度,电源频率)的合理选择原则,以保证理论在实际运用中更加切合实际情况。     

感应通信式矿用馈电状态传感器研究

为了进一步提高煤矿井下馈电状态传感器的性能,通过对煤矿井下特殊情况、馈电状态传感器的理论探索和现有应用的研究,根据《矿井安全监控新标准、新规程汇编》的要求[1],首次提出一种感应通信式馈电状态传感器,它是根据电压互感器原理和无线通信原理来实现的,从而间接检测矿井电缆的馈电状态,与负载是否工作,电缆有无电流流过无关,只要电缆芯线带电,则输出馈电状态;反之,输出非馈电状态.这种感应通信式馈电状态传感器具有灵敏度高、反映迅速、可靠性高以及维护量少等特点.