Research and Implementation of Parallel Artificial Fish Swarm Algorithm Based on Ternary Optical Computer

Mobile Networks and Applications - Artificial fish swarm algorithm (AFS) is used in the field of function optimization problems widely. The traditional AFS algorithm has some problems such as long...     

开槽深度和坡度对高频高阶模带宽和中心频移的影响

为对构建太赫兹频率下高阶单模工作的同轴布喇格谐振腔提供理论依据,基于模式耦合理论,比较研究了不同开槽深度和不同开槽坡度形状及坡度角对工作在太赫兹频率高频高阶耦合模式下工作模式和竞争模式带宽、中心频率偏移特性的影响. 结果表明:工作模式和竞争模式的带宽随着开槽深度的加深都变宽,但中心谐振频率点几乎没有偏移,槽深加深,带隙重叠现象会恶化,不利于模式选择;正圆锥形坡度方式时随着坡度角的增加,工作模式的中心频率点没有发生偏移,竞争模式中心频率点靠近工作模式中心频率点,不利于带隙重叠现象的抑制;倒圆锥形坡度方式时,随着坡度角的增大,竞争模式的中心频率点远离工作模式中心频率点,很好地抑制了带隙重叠;正圆锥形坡度和倒圆锥形坡度对带宽的影响都不大. 这些特性有利于拓展同轴布喇格结构作为反射器和滤波器的性能.     

A Universal Descriptor in Determining H2 Evolution Activity for Dilute Aqueous Zn Batteries

Large-scale energy storage with aqueous Zn batteries (AZBs) have bright future, but their practical application is impeded by H₂ evolution reaction (HER), which results in poor stability of Zn–metal anodes. Here, using linear sweep voltammetry in dilute salt aqueous electrolytes, it is discovered that as the salt concentration decreases, HER is gradually suppressed, which is contrary to prior beliefs. Combining calculations and experiments, it is demonstrated that HER derives predominantly from the sum of Zn²⁺-solvated water rather than the average amount of water in the Zn²⁺-solvation structural unit or free water without interaction with Zn²⁺, which answers the puzzle from above. This result, which differs fundamentally from the previous understandings, sheds new light on the mysterious role of water chemistry in controlling HER and contributes to a more rational design of advanced electrolytes for AZBs.     

多路ISP和多种类出口设备融合控制研究

网络的融合给整个通信产业链带来了巨大的机遇和挑战,是未来发展的趋势。网络的融合给整个通信产业链带来了巨大的机遇和挑战,是未来发展的趋势。真正的融合型设备组必须满足一条标准,那就是从功能和应用上,取代位于网络核心层的所有设备——包括路由器、防火墙、IDS/IPS检测、防垃圾邮件产品等,同时能将以太网交换机、IDS、防病毒网关、防火墙这些分属于不同层面的设备实现联动达成内部上网行为安全管理。基于OSI模型对网络及设备融合进行了分析,设计了立足于社区或大学城模式的融合案例,对兼容性分析和设备配置提出了自己的见解。     

可编程FIR滤波器的FPGA实现

介绍了FIR滤波器的基本的线性相位结构及FIR滤波器的抽头系数SD算法编码。给定滤波器的数字指标,用MATLB设计抽头系数,最后用Verilog HDL语言实现了一个16阶的FIR低通滤波器并在QuartusⅡ上仿真,并对仿真结果与理论值进行比较,波形仿真结果和理论值相吻和,最后将编程数据文件下载到FPGA芯片上。对于不同性能的FIR滤波器,抽头系数是变化的,因此只要对本设计的抽头系数重新在线配置,就可以实现不同的FIR滤波器。     

现代通信技术在海上搜救中的应用

海上搜救是确保船舶航行安全与生命救助的重要手段,也是海洋国际公约的要求,而及时报警和可靠通信则是海上搜救的关键。以国际海上人命安全公约（SOLAS）为依据,结合全球海上遇险与安全系统（GMDSS）的组成、功能和技术现状,全面系统地介绍甚高频、中/高频、卫星以及雷达等现代通信与信息技术在海上救援中的应用范围、主要功能、设备要求和技术特点。目的是将陆地上已经应用成熟的通信技术向海上推广的同时,进一步研究与开发适合海上应用的现代通信和信息技术。     

The formation of trichloronitromethane (chloropicrin) and chloroform in a combined ozonation/chlorination treatment of drinking water

Chlorination of waters from mesotrophic Lake Zurich and eutrophic Greifensee formed about 0.4 and 2 μg 1⁻¹ of trichloronitromethane (TCNM) respectively. Pre-ozonation increased these values to about 2 and 6 μg 1⁻¹. The formation of chloroform was about 40 times higher than that of TCNM, but decreased somewhat, when pretreatment with ozone was performed. Posttreatment with activated carbon eliminates most TCNM but only part of the chloroform. The addition of nitrilotriacetic acid (NTA) or ethylenediamine tetraacetic acid (EDTA) complexing agents applied in detergents and other products, had only a small incremental effect on the formation of chloropicrin, which became significant only when the combined oxidation process was performed in distilled water. In contrast, the addition of triethanolamine to water greatly increased the TCNM formation when ozonation preceded chlorination of water. The possible role of NTA as a presursor for TCNM is further discussed by considering the kinetics of the reaction of ozone with NTA and its ozonolytic products, the iminodiacetic acid and glycine.     

新型高效肥料创制的意义,现状及发展趋势

系统分析了新型高效肥料创制的意义,阐述了缓／控释肥料、稳定肥料、复合（混）肥料和有机肥料的发展现状和趋势,提出了今后我国新型高效肥料创制的方向。     

旅游网络舆情热点事件监测与预警指标体系构建——以海南国际旅游岛为例

文章以海南国际旅游岛旅游舆情事件为研究对象,分析总结了2013年以来海南三亚主要旅游网络舆情事件,围绕网络舆情事件的发布主体、传播媒介、舆情受众、内容要素4个维度和舆情发展情况构建网络舆情监测指标体系和预警警戒,最后提出了建立海南旅游网络舆情总体预案,健全网络舆情事件协调机制和创新网络沟通平台的相关策略。     

Gain-scheduling multivariable LPV control of an irrigation canal system

The purpose of this paper is to present a multivariable linear parameter varying (LPV) controller with a gain scheduling Smith Predictor (SP) scheme applicable to open-flow canal systems. This LPV controller based on SP is designed taking into account the uncertainty in the estimation of delay and the variation of plant parameters according to the operating point. This new methodology can be applied to a class of delay systems that can be represented by a set of models that can be factorized into a rational multivariable model in series with left/right diagonal (multiple) delays, such as, the case of irrigation canals. A multiple pool canal system is used to test and validate the proposed control approach.