燃气轮机机组空气进口导叶控制逻辑分析

介绍了可调空气进口导叶（inlet guide vane,IGV）在燃气轮机控制中的作用及其逻辑控制原理,分析了IGV开度对燃气轮机转速、控制信号输出、排气温度、热通道温度等参数的影响。针对机组进入叶片通道温度控制模式后升负荷过慢的现象,通过分析逻辑控制曲线确定产生这一现象的主要原因是压气机空气流通量不足,根据排气温度、热通道温度随IGV开度变化而变化的特点,采取了调整IGV开度函数的燃气温度函数曲线等措施来解决机组升负荷缓慢的问题。     

基于改进蜂群算法的波浪发电最大功率跟踪

在波浪发电装置最大功率点跟踪中,浮子受到水动力的非线性导致传统群智能算法收敛速度不佳,易陷入局部最优。为此提出纵横交叉优化的人工蜂群算法(CABC)控制方案。引入纵横交叉算法(CSO)横向交叉算子的个体间变量全交叉思想,优化引导蜂、采蜜蜂搜索方式,增强CABC算法局部搜索能力。引入CSO纵向交叉算子优化侦查蜂,使侦查蜂能利用已知蜜源信息探索未知可行解域,提升CABC算法全局搜索能力。优化蜜源选择概率和人工蜂群结构,进一步改善CABC算法性能。仿真表明,CABC算法全局寻优能力强,收敛速度快,适用于波浪发电装置最大功率点跟踪。     

泛系成本运筹学及其应用

基于泛系成本运筹学的信息系统应用于广州五羊摩托车公司后 ,2 0 0 2年整个运营成本在总产值比 2 0 0 1年增加 2 0 %的前提下降低了 2 4 .6 % (绝对值为 980万元 )。本文论述泛系成本运筹学的基本理法 ,涉及泛系泛导运阴阳、大善遗憾、现实显生、八筹八法等等方法论理念 ,成本管理的泛系本质 ,同时剖析了以美国哈佛商学院教授、会计学权威罗宾·库珀(RobinCooper)和罗伯特·卡普兰 (RobertKaplan) ([1])为代表所建立传统作业成本法的结构性缺陷 ,从企业内部成本管理的全面客观需要出发提出了新的作业成本管理—泛系作业成本管理 ,以及应用泛系论从更高的层面创立了成本控制体系标准 (CSO 2 0 0 0 )的结构和指出了成本管理的研究方向。目的是指引企业建立具标杆性、有效性和可操作性的成本管理体系 ,以取得全程供应链成本竞争战略优势     

Simple method for intermodulation products counting in multicarrier systems

This paper presents a novel algorithm for intermodulation products counting in multicarrier systems. Intermodulation products are caused by the nonlinearity of the amplifiers’ transfer characteristic. Along the transmission network, broadband amplifiers are needed to boost up the signal level and compensate the signal attenuation. When the number of carriers increases, the number of intermodulation products also increases extremely fast. In our approach, selective counting procedure by grouping intermodulation products was introduced. The presented solution shows considerable reduction in computational effort in counting the number of intermodulation products in the individual channel, especially if the number of products is very large.     

Hydrological assessment of flow dynamic changes by storm sewer overflows and combined sewer overflows on an event-scale in an urban river

In addition to assessing the impacts of water quality changes in urban rivers caused by storm water sewer overflows (SWO) and combined sewer overflows (CSO), the extent to which flow dynamics are changed by these structures must be understood in order to define hydrological assessment criteria to guide sustainable water management strategies as required by the European Community (EC) Water Framework Directive. In this study, the quantitative impacts of SWOs and CSOs on the flow dynamics of an urban river and their variability are investigated. For four single runoff events, hydrological measurements were accomplished in the River Dreisam, upstream and downstream of the city of Freiburg, in southwest Germany. As the catchment is widely free of urban areas upstream of the city, comparison with downstream locations allowed quantification of Freiburg's effects on the changes in the hydrograph on an event scale. The proposed hydrological parameter—flow acceleration, peak discharge, and discharge dosage—were shown to be appropriate to assess the impacts of SWOs and CSOs on flood hydrographs in urban rivers.     

影响1550nm光纤长距离传输的SBS

就SBS的产生、物理现象、对光纤长距离传输的影响做了系统的介绍，并结合典型案例，提出了提高SBS阈值的方法和注意事项。     

HFC网络中模拟调制信号与数字调制信号的相互影响

简要叙述现阶段HFC网络中模拟调制信号与数字调制信号的相互影响.     

Electrochemical disinfection of Escherichia coli in the presence and absence of primary sludge particulates

Electrochemical (EC) residual disinfection of Escherichia coli (E. coli) in the presence and absence of primary sludge particulates (PSPs) was studied. The kinetics followed a first-order rate law. When PSPs were absent, the EC residual disinfection rate coefficient (k) increased linearly with EC pretreatment energy (E_C, 0–0.63 kWh/m³). However, with 143 mg PSPs/L, k first increased linearly with E_C (0–0.28 kWh/m³) and then decreased linearly with E_C (0.28–0.42 kWh/m³). H₂O₂ was detected during EC pretreatment in PSPs-free samples and the H₂O₂ concentration (C_H) increased with E_C (0–0.83 kWh/m³) linearly. Chloride was detected in PSPs aqueous samples (143 mg PSPs/L) and its concentration (C_C) changed during EC pretreatment: initially, a decrease of C_C was observed when E_C increased from 0 to 0.28 kWh/m³, followed by an increase of C_C when E_C increased 0.28–0.42 kWh/m³. In both cases, k correlated to the initial post-EC chloride concentration (C_CI) in an inverse linear relationship. This two-stage change of C_C and k was caused by a combination of two reactions: anodic oxidation of chloride and the reaction of chloramines with excess chlorine. This paper explains the mechanisms underlying EC residual disinfection in the presence and absence of PSPs, and proposes a feasible strategy for EC disinfection when PSPs are present, an approach that could be useful in the treatment of combined sewage overflow (CSO).     

Improved understanding of combined sewer systems using the Illinois Conveyance Analysis Program (ICAP)

Understanding the conveyance of sewer networks is vital, especially in cases of great variability in flow rates, such as in combined sanitary and storm sewer systems. Conventional conveyance studies in sewer systems often have extended computation times due to complexity of the solution, or alternatively make assumptions that ignore the water-surface profile within a pipe. In previous research, the hydraulic performance graph (HPG) was successfully used for open-channel capacity determination. The HPG summarizes the results of many backwater calculations for a reach so that these calculations do not need to be repeated. This article describes algorithms utilized by the Illinois Conveyance Analysis Program that uses the HPGs to describe the conveyance of a system, identify bottlenecks for varying conditions, conserve mass by tracking outflow and overflows under stepwise steady flow conditions. The software is freely available at https://github.com/obergshavefun/icap/wiki.     

基于改进的鸡群算法在云计算资源调度中的研究

针对云计算中的资源调度效率低的问题,提出将改进后的鸡群算法用于调度。引入反向学习概念对鸡群种群进行初始化,提高全局搜索能力。对小鸡的位置引入了粒子群算法中的权重值和学习因子的概念进行改进,优化了鸡群个体位置,通过差分算法对鸡群算法整体的个体位置进行优化,最后通过边界处理从整体上预防了算法中个体位置可能出现的越界。在仿真实验中,将优化后的鸡群算法与基本鸡群算法,粒子群算法和蚁群算法进行在完成时间、花费成本、能量消耗和负载均衡中进行了对比,取得了较好的效果。