He─Ne激光管生产中的质量与成本问题

从真空技术的角度出发．围绕生产氦氖激光管的真空获得、测量及除气问题探讨如何提高质量及降低成本。     

秸秆直燃生物质电厂动态发电成本分析

结合火电厂成本研究方法,以月为单位建立生物质发电动态成本分析模型,根据机组容量与负荷特性分摊年固定成本,以生物质发电系统为研究对象计算不同秸秆价所对应发电成本的最大值和最小值,并对发电成本进行了敏感性分析.结果表明:燃料费的变化对生物质电厂发电成本的影响最大,折旧费和厂用电费的影响其次,燃料价格降低10%和20%时,发电成本分别降低5.09%和10.17%.     

电弧炉炼钢流程多尺度控制模型研究

首先对电弧炉炼钢流程的成本控制模型与专家指导模型进行了研究。在此基础上探讨时空多尺度在电弧炉炼钢上的作用,进而实现了电弧炉炼钢流程模型的多尺度集成。模型成功应用于国内外多家企业的电弧炉生产过程,冶炼指导与经济效益显著。     

考虑可再生性的全生命周期净能源成本评估方法研究

提出了一个新的考虑燃料可再生性的净能源成本指标。这一指标将燃料的净能源产出、气态污染物排放外部成本、生命周期成本和能源可再生性综合成一个统一的指标，燃料指标值越低表明燃料的总体表现越好。运用该指标对木薯乙醇——汽油混合燃料和传统汽油燃料分别进行了评估。结果表明与分别评价燃料的净能源产出、生命周期成本、排放和可再生性指标比较，为考虑燃料的可再生性的全生命周期净能源成本指标提供了一个区别燃料优劣的有力手段。     

晶体硅太阳电池制备工艺进展

晶体硅太阳电池是目前应用最广、技术最为成熟的太阳电池,以晶体硅太阳电池生产流程为基础．主要从降低生产成本和提高电池转换效率方面出发,介绍了太阳电池制备工艺的最新进展,并对各种制备工艺作出了评价和展望。     

一种国外火电厂烟气脱硫系统成本估算模型介绍

近些年来,随着能源与电力行业的快速发展,导致了大量SO2污染物的排放,因此必须推广烟气脱硫技术以减小SO2的排放。介绍国外的一种根据初投资和运行维护费用对新建电厂和原有电厂增加脱硫系统的成本估算模型。此模型可以初步评价机组FGD(FlueGasDesulfurization)建设的经济性,估算初投资、运行和维护成本,从而为电厂脱硫的预可行性研究提供参考。     

Analysis and Comparison of Location Strategies for Reducing Registration Cost in PCS Networks

In mobile environments, a personal communication service (PCS) network must keep track of the location of each mobile user in order to correctly deliver calls. A basic scheme used in the standard IS-41 and GSM protocols is to always update the location of a mobile user whenever the mobile user moves to a new location. The problem with this approach is that the cost of location update operations is very high especially when the mobile user moves frequently. In recent years, various location management strategies for reducing the location update cost have been proposed. However, the performance issue of these proposed algorithms remains to be investigated. In this paper, we develop two Markov chains to analyze and compare the performance of two promising location update strategies, i.e., the two location algorithm (TLA) and the forwarding and resetting algorithm (FRA). By utilizing the Markov chain, we are able to quickly answer what-if questions regarding the performance of PCS networks under various workload conditions and also identify conditions under which one strategy can perform better than the others. Using the cost due to location update and search operations between two successive calls to a mobile user as a performance measure, we show that when the mobile user exhibits a high degree of locality and the mobile user's call-to-mobility ratio (CMR) is low, TLA can significantly outperform both FRA and IS-41. On the other hand, when CMR is high, FRA is the winner. Furthermore, unlike TLA which may perform worse than IS-41 at high CMR values, FRA at identified optimal conditions can always perform at least as good as IS-41, suggesting that FRA over TLA should be used as a generic scheme in reducing the location cost in the PCS network to cover all possible per-user CMR values.     

汇川技术HD92高压变频器在高炉鼓网机上的应用

本文介绍了汇川技术HD92系列大功率高性能高压变频器在钢铁行业高炉鼓风机上的成功应用,系统采用了双机并联方案,并且具备工变频的无扰切换功能,能够实现单台故障时,另一台不停机且能够无扰切换至工频运行。     

基于全网业务模型和蒙特卡洛仿真的电力通信网可靠性评估

传统的电力通信网可靠性研究基于网络的拓扑结构和业务流向,没有考虑电力通信业务复杂的组网方式。基于烟台电力通信网在运业务的实际情况,提出了复杂的系统级仿真模型。在此基础上,提出了光缆可靠度和设备可靠度的概念。另外,本文提出了可靠性破坏代价的概念,通过蒙特卡洛系统级仿真,给出电力通信网全网的可靠性数据。     

机载电扫雷达单脉冲动目标检测工程分析

针对机载电扫单脉冲雷达,探讨一种自适应偏置相位天线（ADPCA）优化权值计算思路的可行性,并详细推导文献[2]中两种频域ADPCA方法引入波束锐化思想提高性能的机理和区别。其次讨论补偿空间相移、主杂波跟踪及天线子阵间距设计对时频域ADCPA性能的影响。最后给出了两种可行方案的计算耗时比较。