Electricity Production

Current data on net electricity production, as well as a breakdown of production by country. Updated on a monthly basis.     

Mixed coordination mechanisms for scheduling games on hierarchical machines

In this paper, we study scheduling games under mixed coordination mechanisms on hierarchical machines. The two scheduling policies involved are ‐ and ‐, where ‐ (resp., ‐) policy sequences jobs in nondecreasing order of their hierarchies, and jobs of the same hierarchy in nonincreasing (resp., nondecreasing) order of their processing times. We first show the existence of a Nash equilibrium. Then we present the price of anarchy and the price of stability for the games with social costs of minimizing the makespan and maximizing the minimum machine load. All the bounds given in this paper are tight.     

Interactions between hybrid nanosized particles and convection melting inside an enclosure with partially active walls: 2D lattice Boltzmann-based numerical investigation

The ice melting is investigated inside a square cavity with two isothermally partially active walls. The concept of dispersing hybrid alumina–Cu nanoparticles and hybrid silica–multiwalled carbon nanotubes (MWCNTs) nanoparticles is recommended for thermal performance enhancement in this thermal energy storage (TES) system. The two-dimensional explicit lattice Boltzmann convection melting scheme in the single-phase model is applied to account for the natural convection flow induced in the melt region and evolution of the solid–liquid interface. The complete melting time for the pure phase change material (PCM) using case (II) is 33.3% lower compared with other cases. If the price of hybrid Al₂O₃–Cu nanoparticles and heat storage capacity is important, the full melt time diminishes by 16.6% with a volume fraction of 0.01 in case (II). Once hybrid silica–MWCNT nanoparticles with a volume fraction of 0.01 are utilized inside case (II), the lowest charging time is achieved. The complete melting time abates by 23.66% in contrast to the pure PCM melting. The use of single/hybrid nanoparticles to enhance the PCM melting is not necessarily economical as efficient positions of active parts could further lessen the charging time. The efficiency of hybrid nanoparticles is linked to the type and weight proportions of nanoparticles, and positions of thermally active parts.     

如何在工程量清单招标模式下提高中标率

介绍了在工程量清单招标模式下,为提高中标率应重视的关键过程,报价策略和方法,并对该招标模式下尚存在的与市场竞争机制不相一致的若干问题进行了探讨。     

城市土地价格的动态增长研究

由于土地是不可再生的准公共品，市场土地供应总是小于土地需求。一个城市的土地总体价格水平将会因为资本追加、土地的集约利用以及城市基础设施、公共服务的改善而得到提高，地价总是趋于动态增长的。本文就是试图对这一现象进行研究。     

矿山基建合理确定建筑工程造价初探

结合北Min河铁矿基建过程中的工程实例，分析了建筑工程造价的确定步骤、影响因素，并对如何合理确定建筑工程造价等问题进行了初探。     

基于单片机控制的无线电表检测系统

介绍了一种以单片机89c51为核心的无线电表检测系统,并通过软件系统对硬件电路加以控制,实现对电能量的采集、比较、校验和计算机的检测等功能。本系统具有结构简单,成本低,可靠性高,控制能力强的特点。     

国内大功率自动化电牵引采煤机的现状和发展

本文宏观介绍了目前我国大功率电牵引采煤机的使用情况,并阐述了国内外大功率电牵引采煤机在结构性能参数和自动化技术方面的差距、国内主要采煤机生产厂家研制开发的状况、以及自主研制大功率自动化电牵引采煤机的紧迫性和必要性。     

变压器经济运行区间划分的节电降耗

开展变压器经济运行是节电降耗的重要途径,而变压器经济运行区间是开展变压器经济运行的重要概念。本文阐释变压器经济运行区间的概念和求解原理;并以实际某变电站为例,说明经济运行区间的求解方法及其应用;同时给出取得的节电降耗效果和经济效益。     

提升电控系统改造与分析

总结煤矿副井直流发电机 -电动机组提升电控系统改造的实施方法 ,对该系统进行简要分析。改造后系统加强了安全保护功能 ,缩短了提升周期 ,提高了运行效率 ,提高了控制精度 ,实现系统首发故障查询。