纵横交叉算法在配电网故障定位中的应用

基于人工智能算法具有较好的容错性,引入纵横交叉算法(CSO)应用在配电网故障定位过程中。CSO中的横向交叉机制和纵向交叉机制在与竞争算子的配合下提供了较强的搜索能力,能够快速解决多变量非线性优化问题,为准确解决故障定位提供了基础。在多电源分区故障定位中改进适应度函数,对不同区域适应度函数设置区域权值,区域权值由反馈故障电流决定。这种设置方式可以增强算法的容错性,使得输出结果不会因为故障信息在传送过程中发生畸变而误判或者漏判。仿真部分由双电源配电网系统和三电源配电网系统组成,并通过算法进行了验证,每次反馈信息都由一次正常信息和畸变信息组成。从仿真结果可以看出CSO拥有较强的稳定性。     

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.     

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。     

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.     

巢湖市排水系统雨天溢流污染控制策略

合流制系统改造及溢流污染控制是黑臭河道治理的核心工作之一。文中在总结国内外合流制溢流污染(CSO)治理措施的基础上,论述了巢湖市排水系统溢流污染控制策略。系统分析了合流制溢流污染产生的原因,依据巢湖市污染排查和管网检测等前期研究相关结果,提出了整体控制策略;并选取典型区域小王庄中沟,提出针对典型区域合流制系统的控制措施,即在现有管网的基础上,借助管网系统与系统之间的互调性以及末端调蓄控制手段,对整个管网的污水运行及入河排放进行污染物溢流污染控制。     

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。     

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.     

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).     

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.