铁路货运数据网格平台的设计与实现

将网格技术应用到铁路货运信息系统,构建铁路货运数据网格RFDGrid平台,用于管理分布的数据和计算资源,通过资源共享和协同操作解决应用中出现的问题.RFDGrid以CNGrid为基础,屏蔽数据的分布性和异构性,为铁路货运信息应用提供统一的虚拟数据视图.通过分析铁路货运信息系统的现状及存在的问题,详细讨论了RFDGrid的设计思路,并阐述了其部署实现和使用的过程.     

基于观测器的飞机除冰液温度鲁棒控制方法研究

对飞机除冰液温升模型的时变和延时特性进行了分析研究.采用Pade逼近对飞机除冰液加热系统的纯时延特性进行近似,将系统的时延问题转化为非时延问题进行处理.为克服由于飞机除冰作业过程中流量变化所造成的系统模型参数变化,采用基于滑模变结构的鲁棒控制方法对系统模型参数摄动进行补偿.为解决系统状态不可测问题,消除Pade逼近误差对出口温度的影响,采用状态观测器对系统的状态进行估计,并对Pade逼近模型输出误差进行补偿.利用系统不同流量下的试验温升曲线模型对设计的控制策略进行了仿真研究,仿真结果验证了所提出算法的有效性.     

Enhancing Phosphorous Recovery in a Novel Biofilter System

Developing new techniques to remove and recover phosphorous simultaneously from wastewaters is very important for sustainable utilization of phosphorous resource and prevention of eutrophication. The feasibility of phosphorus bioaccumulation in a novel continuous alternating anaerobic /aerobic biofilter and benefits of such accumulation for its further recovery as magnesium ammonia phosphate （MAP） were studied. The system was operated for seven months and employed the atomic absorption spectrophotometer （AAS） method to analyze the distribution change of magnesium and calcium with phosphate in the biofilter during that period. The benefits of utilizing the biofilter system to accumulate phosphorous ＆ magnesium and suppress calcium simultaneously to phosphorous recovery as MAP were explained with the aid of chemical equilibrium models. The improved phosphorus recovery from 42% to 82% was approved in the recovery experiments and the recovery products mainly as MAP were evidenced and characterized with scanning electron microscopy （SEM） . The study provides references for designing and operating the novel alternating anaerobic /aerobic biofilter for phosphorus bioaccumulation and recovery.     

水利工程建设项目施工阶段质量控制的措施

水利水电工程项目质量是国家现行的有关法律、法规、技术标准、设计文件及工程承包合同对工程的安全、适用、经济、美观等特征的综合要求,工程项目质量体现在适用性、可靠性、经济性、外观质量与环境协调等方面。工程质量控制是指为达到质量要求所采取的作业技术和活动,实际上就是对工程在可行性研究、勘测设计、施工准备、建设设施、后期运行等各阶段、各环节、各因素的全程、全方位的质量监督控制。本文结合工程实践,就水利工程建设项目施工阶段质量的控制措施谈几点看法。     

Rnoise系统中的道路声屏障设计方法

介绍了一种基于综合数字地面模型以及随机车流声源等效替代和分解技术的户外道路交通噪声分析方法与系统，详细了基于该系统的道路声屏障设计与优化方法，该方法能够近似模拟实地各种环境条件的影响，如建筑物，地形，树木植被以及大气条件等，在一定程度上实现了道路交通噪声和声屏障降效果的可视化设计与评价。     

利用ASR和TTS技术的股票查询系统的设计

服务器端 :1)打开一通信通道并告知本地主机 ,它愿意在某一端口上接收客户的请求。在 TCP/ IP网络中 ,端口分为两部分 ,一部分是保留端口 ,另一部分是自由端口。其中保留端口占很小的数目 ,以全局方式进行分配 ,也就是我们常说的周知口。而自由端口占全部端口的绝大部分 ,它以本地方式分配 ,不具有全局唯一性。当一个客户进程要与远程服务器通信前 ,首先需要申请一个自由端口 ,然后通过服务器的周知口与远程服务器取得联系 ,收发数据。2 )等待客户请求到达该端口。3)接收到不同通道的请求 ,处理该请求并发送应答信号。由于客户端可同时接…     

利用ASR和TTS技术的股票查询系统的设计

ASR和TTS技术的使用对实际客户而言，使用和操作极为方便，有效利用了现有发达的电话网资源，本介绍了TTS和ASR引擎结合自然语言在股票查询系统的应用。     

基于MESH网和CC2430芯片的ZIGBEE抄表系统硬件概述

本文分析了MESH网络和CC2430芯片的特点,确立了以MESH网络为基础的系统网络拓扑结构,并采用CC2430芯片设计硬件节点,通过ZIGBEE自动抄表系统结构图和工作流程图的设计,最终建立一个基于MESH网和CC2430芯片的ZIGBEE抄表系统.     

Estimating Fatty Acid Composition of Infant Buccal Mucosal Cells by Capillary Gas Chromatography

Long chain polyunsaturated fatty adds, i. e., docosahexaenoic acid （DHA or C22 ： 6n - 3）, amchidonic acid （AA or C20 ： 4n -6） have been identified as essential fatty acids and play an important role in growth and development of infants. Measurement of fatty acid composition is usually by collection of blood, but to obtain blood in infants is difficult. Nowadays, the fatty acid composition can be estimated by collecting buccal mucosal cells, which can avoid repeated blood sampling. The of this paper is to compare the fatty acid composition of cheek cells with that of plasma and red blood cells （RBCs）. In this study, twenty-seven infants were enrolled, and buccal mucosal cells and blood samples were obtained from these infants of the same time. Fatty acid composition of buccal mucosal cells, plasma and RBCs were measured by capillary gas chromatography. The results show that the contents of AA and DHA in the buccal macosal cells are correlated well with that in the plasma [r=0.36 （P=0.042） and r =0.38 （P =0.033）, respectively]. The ratio of AA to DHA is 1.32% in buccal mucosal cells, 1.60% in plasma and 1.55% in RBCs and there are no significant differences among groups （P = 0.134）. It shows that the fatty acid composition in buccal macosal cells can reflect the fat nutrition status in infants and can be detected by capillary gas chromatography. Estimating fatty acid composition of buceal mucosal cells in infants by capillary gas chromatography is feasible, and because of its noninvasiveness, it can be suitable for nutrition research in infants.     

铑—二氯化锡—罗丹明B分光光度测定微量铑

研究了在聚乙烯醇存在下,铑与二氯化锡和罗丹明B的显色反应。在0.8—2.0MHCI中,生成紫色离子缔合物。最大吸收波长570—575nm。摩尔吸光系数为1.46×10~5l·mol~(-1)·Cm~(-1)铑含量在1—10ug/25ml内服从比尔定律。研究了多种离子对测定的影响。方法应用于铑—活性炭催化剂中铑的测定,获得了满意的结果。