集美污水处理厂污泥深度脱水技术探讨

集美污水处理厂原采用的污泥带式压滤脱水产出的泥饼含水率为80%,不满足进入填埋场标准.为解决污泥出路问题,集美污水处理厂于2009年采用污泥深度脱水技术,在浓缩污泥中添加三氯化铁和生石灰进行调理,再经过高压隔膜厢式压滤机脱水,可生产出含水率在60%以下性状稳定的泥饼,符合混合填埋的要求.介绍了工程实际运行情况,并对污泥深度脱水与传统带式脱水进行经济分析.     

改进的激光陀螺热致零偏补偿算法研究

针对现有的激光陀螺热致零偏补偿方法在精度方面存在不足的问题,设计了一种在神经网络基础上改进的热致零偏补偿算法,利用神经网络求取更加准确的热拟合系数,从而有效抑制热致零偏对激光陀螺的影响;文中建立了两种激光陀螺的温度补偿模型:常规零偏温度补偿简化模型和一种改进的神经网络模型,并根据建立的两种模型进行了仿真研究;通过与常规的零偏补偿方法的仿真结果比较可知,改进的热致零偏算法在精度上有了显著的提高,具有良好的工程使用价值。     

鳝鱼自动剖切机设计与试验

目的：设计一款专门用于剖杀细长且表面光滑的鱼类剖切机构。方法：以表体黏滑的鳝鱼为研究对象,开展夹持与剖切作业机理分析。以剖切质量和剖切时间为试验指标,探究夹轮转速、剖刀转速、夹轮表面几何形状等主要参数对剖切质量和剖切时间的影响规律。结果：影响剖切质量的主要因素为刀片转速和夹持轮限位高度,影响剖切时间的最主要因素为夹轮转速。当夹轮限位高度为5 mm、刀片转速为1 350 r/min、夹轮转速为167 r/min时,可获得较高的剖切质量评分与剖切时间。结论：使用夹持轮可以有效输送鳝鱼,通过调配夹持轮转速、刀片转速和限位高度可以实现高效高速剖腹。     

An improved differential evolution algorithm for vehicle routing problem with simultaneous pickups and deliveries and time windows

The vehicle routing problem with simultaneous pickups and deliveries and time windows (VRP-SPDTW) is the problem of optimally integrating forward (good distribution) and reverse logistics (returning materials) for cost saving and environmental protection. We constructed a general mixed integer programming model of VRP-SPDTW. The model contained some classical vehicle routing problems as special cases. We proposed an improved differential evolution algorithm (IDE) for solving this problem. In the algorithm, we firstly adopted the novel decimal coding to construct an initial population, then used some improved differential evolution operators unlike the existing algorithm, and in mutation operation, we used an integer order criterion based on natural number coding method. We introduced a penalty technical to publish the infeasible solution. In addition, in the crossover operation, we designed a self-adapting crossover probability that varied with iteration. We did some numerical experiments, and the results showed that the proposed method is effective for solving VRP-SPDTW.     

基于GPRS—Internet的换热站无线远程监控系统

根据集中供热系统数据采集的特点,介绍了基于GPRS-Internet网络的换热站无线远程监控系统的组成以及换热站的自动控制.远程换热站采集现场的温度、流量、压力等数据,并通过GPRS-Internet网络传送到监控中心.监控中心实现了对整个供热系统进行远程自动化控制,解决了整个供热系统热工参数难以采集和热量分配不均等问题.运行结果表明,该系统稳定性好、调节精度高、操作方便,可以满足远程监控和长周期稳定运行等要求.     

图算法句法分析器自动生成

句法分析自动生成对提高自然语言处理程序开发效率有重要意义。文章提出支持复杂特征和合一文法的图算法句法分析器预自动生成方法，详述了规则描述、输出代码模式及生成过程中的主要算法，并实现了一个自动生成器。测试表明，在保证执行效率的同时，该自动生成方法可以很好地增加句法分析的可扩展性。     

网络监视

该文解释了网络监视的基本概念，功能模型以及其作为网络管理的一部分其他相关部分的关系；最后，在介绍了网络监视软件的设计机制后，着重指出了网络监视在网络软件开发中的应用。     

An effective method for deproteinization of bioactive polysaccharides extracted from lingzhi (Ganoderma atrum)

Deproteinization procedure is a fundamental step for analyzing polysaccharide from natural plants. In this study, in the course of refining bioactive polysaccharides from lingzhi (Ganoderma atrum), an effective deproteinization method using lead acetate solution was established by comparing with other available methods. The percentages of deproteinization, polysaccharide loss, and its antioxidant activities loss were used as the index to evaluate and optimize the precipitation experimental conditions. The results showed that the modified method, precipitation with the addition of 0.4–0.52%(w/v) lead acetate, was superior to the others, as evidenced by the highest deproteinization efficiency (88%), as well as the lowest polysaccharide loss (17%). And notably its antioxidant activity also remained good (loss 15%). It provides a simple prefractionation step for the analysis of polysaccharide from natural plants. Polysaccharide isolated by this method is in the native state. Our method may offer a rapid method for removing protein from plant polysaccharides in large scale.     

Spoilage of refrigerated (4 °C) Litopenaeus vannamei: cooperation between Shewanella species and contribution of cyclo‐(L‐Pro‐L‐Leu)‐dependent quorum sensing

The spoilage potential of Shewanella putrefaciens and S. baltica isolated from spoiled refrigerated Litopenaeus vannamei was evaluated by in vitro assays for trimethylamine oxide reduction, extracellular hydrolytic enzymes and biofilm formation, and in vivo inoculation into surface‐sterilised shrimp followed by microbial, biochemical and sensory analyses during storage for 5 days at 4 °C. S. baltica displayed higher spoilage potential than S. putrefaciens both in vitro and in vivo. Shrimp co‐inoculated with them had one‐day shorter shelf life than those mono‐inoculated, based on the results of bacterial density, volatile base nitrogen, trimethylamine, volatile organic compounds and sensory analysis, which strongly suggests cooperation of Shewanella species in shrimp spoilage. Exogenous cyclo‐(L‐Pro‐L‐Leu) boosted bacterial growth, extracellular protease and collagenase activities, and biofilm formation of S. putrefaciens and S. baltica at least before they entered the stationary phase, indicating that cyclo‐(L‐Pro‐L‐Leu)‐dependent quorum sensing, a recently suggested communication mechanism between them, contributes to the cooperation.     

Microstructure and Corrosion Resistance of Electrodeposited Ni-Cu-Mo Alloy Coatings

This paper deals with the electrodeposition of Ni-Cu-Mo ternary alloy coatings on low-carbon steel substrate from an aqueous citrate sulfate bath. The structures and microstructure of coatings were characterized by scanning electron microscopy and x-ray diffractometry. The corrosion resistance of coatings was investigated by potentiodynamic polarization (Tafel) and electrochemical impedance spectroscopy techniques. The results show that the Ni-Cu-Mo coatings are mainly composed of fcc-Ni phase and a small amount of NiCu phase. Ni-Cu-Mo coatings exhibit a nodular surface morphology, and the roughness of electroplated coating increases with the increasing of Na₂MoO₄·2H₂O in the bath. The corrosion performance of the coatings is significantly affected by the Mo content of the alloy coating and their surface morphology. The coating prepared in bath containing 40 g/L Na₂MoO₄·2H₂O has the highest corrosion resistance in 3.5 wt.% NaCl solution, while that prepared in bath containing 60 g/L (or more) Na₂MoO₄·2H₂O shows a lower corrosion resistance due to the presence of microcracks on the coating surface.