Emergency rush repair task scheduling of distribution networks in large-scale blackouts

This paper focuses on the emergency rush-repair task scheduling of distribution networks in power grid emergencies. As there are many characteristics in distribution network emergency rush-repair such as large number of rush repair points, diverse but with limited repair resources and urgent repair time, this paper takes constraint conditions, such as a variety of execution modes and repair resources into consideration during the model building process of the emergency rush repair scheduling, and we study emergency repair strategies, such as using the emergency generator vehicle, nearby repair strategy and ordinary repair strategy. In order to obtain the optimal solution and satisfy the constraints of the distribution network repair model, this paper improves the traditional serial schedule generation mechanism to a distribution network repair serial schedule generation mechanism by using improved SA algorithm and hierarchical optimization method to search the optimal solution. Finally, we use the model to an example and analyze it. It is validated that the two schedule generation mechanisms that use nearby repair strategy and ordinary repair strategy are both effective. Both the advantages and disadvantages of two mechanisms, and the feasibility and rationality of the model are analyzed in this paper.     

广西大型泵站现状及发展对策研究

结合广西大型灌溉排水泵站更新改造规划,分析了广西大型泵站的现状,阐述其存在的主要问题,并提出推动广西大型泵站发展的意见和建议。     

Volterra积分微分方程大系统在结构扰动下的稳定性

本文中,我们引进了Volterra积分微分方程大系统x′=A(t)x+integral from n=0 to t C(t,s)x(s)ds在结构扰动下稳定性的概念,并利用向量V-泛函方法,得到Volterra积分微分方程大系统关联稳定性的若干结果。     

A large-scale multi-agent system for navy personnel distribution

In the US Navy, at the end of each sailor's tour of duty, he or she is assigned to a new job. The Navy employs some 280 people, called detailers, full time to effect these new assignments. The intelligent distribution agent (IDA) prototype was designed and built to automate, in a cognitively plausible manner, the job of the human detailers. That model is being redesigned to function as a multi-agent system. This is not a trivial matter due to the fact that there would need to be approximately 350 ‐ 000 individual agents. There are also many issues relating to how the agents interact and how all entities involved, including humans, exercise their autonomy. This paper describes both the IDA prototype and the multi-agent IDA system being created from it. We shall also discuss several of the major issues regarding the design, interaction and autonomy of the various agents involved.     

大型陶瓷壁画电脑喷绘制作系统

简要阐述了电脑应用于大型陶瓷壁画制作的技术可行性。并对电脑瓷板画普遍存在的偏色技术难题,给出了解决问题的一种新方法,大大提高了大型陶瓷瓷板画的成色质量。对大型壁画的生产工艺给出了具有创造性的新思路。     

Fault tolerance design for large-scale optical switches

In this paper, we present an enhanced fault tolerance in large-scale optical switches through innovations in architecture and control logic design. A large-scale switch is constructed from a network of 2×2 optical switch elements (SEs). Classic switch network architectures, such as the Benes, are not designed with fault tolerance in mind. There are three major contributions in this paper: (1) we developed an analytical method, referred to as the probability accumulation method, to calculate the average connection blocking probability in a faulty switch network; (2) we provided a failure-aware routing algorithm to effectively circumvent connections from defected SEs in a dilated Benes switch; and (3) we improved the connectivity pattern of the Benes network to further reduce the blocking probability, especially when the SE failure rate is low.     

ATMOSPHERIC DISPERSION OF LARGE SCALE SPILLS

Large scale spills of volatile cryogenic or pressurized ambient temperature liquids often produce denser-than-air clouds which disperse in the atmosphere in a manner that is different than trace gases. These differences are due to density or gravity-induced effects such as turbulence damping from the stable density stratification, alteration of the ambient velocity field due to gravity flow, and the source momentum flux. Also important are thermodynamic effects such as aerosol formation and flash vaporization upon release, evaporative cooling, or heat transfer from the ground modifying cloud buoyancy and turbulence. In addition, chemical reaction effects such as hydrolysis with atmospheric water vapor, polymerization, or decomposition which also affects cloud density and thermodynamics can be important. These effects are very important close to the release point but also can have dramatic effects on the cloud as it disperses downwind.

Large scale tests involving releases of heavy gases have been conducted since the early 1970's. These tests have resulted in the discovery of previously unknown and important effects, the accumulation of data for model validation, as well as accident simulation and evaluation of accident mitigation equipment and techniques. A review of recent tests and some of the important results will be presented and examples from recent test series will be used in a review of our current understanding of dense gas dispersion.

The status of computer modeling in this field will also be reviewed with an emphasis on the problems associated with Gaussian models and recent progress in intermediate and 3D conservation equation models. Two of these models, FEM3 and SLAB will be compared to data so that the observed phenomena can be understood and so that predictions can be made regarding the consequences of accidental spills of sizes of concern to industry. FEM3 simulates the dispersion of the released gas by solving the time-dependent, three-dimensional conversion equations of mass, momentum, energy, and species. This model is used as a research tool and is designed to simulate as closely as possible the physics and thermodynamics governing the dispersion process. Steady-State SLAB is based on the crosswind-averaged form of the conservation equations, using similarity profiles to determine the crosswind dependence. It also conserves mass, momentum, energy and species, but is inherently one-dimensional, and is computationally simple and fast to use.     

分布式大规模交通网络实时模拟系统

大规模交通网络的研究目前已经成为一个热点研究领域,大规模交通网络的实时模拟为交通规划和交通控制提供了一个研究的平台和基础,因此模拟系统的设计与实现具有相当重要的意义。由于网络规模以及汽车数量的原因,使用单台计算机不可能满足模拟整个城市规模交通网络的需求,必须采用分布式模拟系统。文章研究并设计了分布式大规模交通网络模拟系统,具体试验表明完全可以满足实时模拟的需要。     

加快发展规模企业与名牌优势

发展规模企业,培植名牌优势,企业要在社会主义市场经济体制中,形成自己竞争优势。