2001年我国部分蔬菜和肉类污染状况调查及分析

为了解我国蔬菜和肉类污染的状况 ,受卫生部和国家三绿工程办公室委托 ,我们于 2 0 0 1年秋季在全国 14个城市采集了 6种蔬菜 10 8份样品和 30份猪肉及 15份鸡肉进行了有关污染物的污染状况调查。监测指标有铅、砷、甲胺磷和氯霉素等。结果发现所检的 4 5份肉的铅、砷和氯霉素全部符合国家标准 ,10 8份蔬菜中有一份铅超标 ,砷含量全部合格 ,但是发现蔬菜中存在滥用剧毒农药甲胺磷的情况 ,蔬菜中甲胺磷的平均检出率为 12 % ,检出率最高的为卷心菜 2 7 7%。     

基才研华数据采集卡PCI-1710-B的倒立摆控制系统研究

倒立摆控制系统是一个典型的高阶次、不稳定、多变量、非线性和强藕合控制系统。本文研究对象是基于研华公司数据采集卡PCI-1710-B的倒立摆控制系统。通过对一级倒立摆系统控制原理分析、数学建模分析、状态反馈设计、MATLAB仿真。然后在搭建的实验平台上用LQR方法编程实现对其最优控制。MATLAB仿真结果良好，软件部分采用VB开发，实现了对系统的‘倒立’控制和相关实时参数的显示。     

信用卡催收信息管理系统的设计与实现

现代商业银行将搭建统一的支持信用卡、零售、非零售等多业务品种的催收信息管理平台,以实现商业银行集中的催收信息管理。简单介绍信用卡催收信息管理系统的需求背景,描述系统的总体设计。系统地介绍信用卡催收信息管理系统的业务需求及其处理流程的设计与实现,包括任务生成、各种催收管理方式、实时及批量查询、数据获取及加载等。在系统总体实现方面详细阐述了系统实现平台、核心要素以及设备性能容量。最后描述了系统的安全措施及其实现方法。     

基于ARM的远程数据采集系统的设计与实现

随着电子技术的发展，ARM系列微处理器得到越来越广泛的应用。介绍了一种基于ARM系列的微处理器S3C4480X与串行A／D转换器MAX186，并利用外置Modem构成的一个远程数据采集系统。介绍了S3C44BOX及MAX186的性能特点，并说明了系统的组成原理、主要外围接口设计和系统软件设计框架，给出了A／D转换子程序。系统在实际中取得了很好效果。     

无线传感器网络延迟约束的MDC分布式轨道规划算法

针对引入移动元素后无线传感器网络数据面临的收集延时问题,提出了一种分布式的移动数据收集器(MDC)轨道规划算法.首先给出基于k跳支配集的MDC最小时延规划问题定义,并证明它是NP-hard.在基于集结的数据收集模式汇总,k跳支配节点作为集结点缓存传感节点收集的数据并在MDC到达时上传.然后,提出了一种高效的基于k跳支配集的MDC轨迹构建算法.算法通过分布式的k-跳支配集算法找出网络中的支配节点,进而通过Prim算法和Christofides近似算法对MDC的移动轨道进行规划.算法的正确性、k-跳支配集的界、时间复杂性和消息交换复杂性通过理论进行分析.最后,通过仿真实验验证了算法的有效性.仿真结论表明,与同类算法相比,所提出算法能够显著缩短MDC的移动轨迹,因而可以降低网络延迟.     

A simple generational real-time garbage collection scheme

This paper presents and empirically evaluates a generational real-time garbage collection scheme, which is based on combining Baker’s real-time scheme with a simple generational scheme by Andrew W. Appel. Real World Computing Partnership. Khayri A. M. Ali, Ph.D.: He currently works as Dean of the Faculty of Computer Science at October University for Modern Sciences and Arts, Egypt. He received his B. Sc. (1970) in Electronics, his M. Sc. (1977) in Automatic Control, both from Egypt. He received his Ph.D. in Computer Systems from the Royal Institute of Technology, Stockholm, in 1984. His research interests are in developing parallel and distributed logic, functional, object-oriented, and constraints programming systems.     

办公自动化通用信息采集系统研究

以简单灵活、方便用户使用为目标,对办公自动化通用信息采集系统进行研究,分析其主要功能和模块组成,提出系统的设计方案。同时以Web、XML等技术为基础,讨论模块的主要技术要点,并对安全问题分析,为系统实现提供技术支持。     

小型水电站数据采集系统中的流速采集

介绍一种微型化的智能流速采集仪，该仪器以89C53为CPU对干簧管式流速仪或接触丝式流速仪进行流速采集，并作为小型水电站数据采集系统的流速远端为其服务。     

A detailed study of p–n junction solar cells by means of collection efficiency

The operation of a crystalline silicon solar cell was studied by a methodology based on collection efficiency. The collection efficiencies of the base, emitter, and depletion layers were determined separately using numerical solutions. The quantum efficiency was then determined by the reciprocity theorem. It is shown that the model can provide useful new insights and can be used to extract device parameters by fitting the modelled results to experimental data.     

Environmental impacts of the Swiss collection and recovery systems for Waste Electrical and Electronic Equipment (WEEE): a follow-up

While Waste Electrical and Electronic Equipment (WEEE) collection and recovery have significantly gained in importance all over Europe in the last 15 years, comprehensive studies assessing the environmental loads and benefits of these systems still are not common. In this paper we present the results of a combined material flow analysis and life cycle assessment study, which aimed to calculate the overall environmental impacts of collection, pre-processing and end-processing for the existing Swiss WEEE collection and recovery systems, as well as of incineration and landfilling scenarios, in which the same amount of WEEE is either incinerated in a an MSWI plant or landfilled. According to the calculations based on the material flow data for the year 2009 and a new version of the ecoinvent life cycle inventory database (ecoinvent v2.01), collection, recovery and disposal result in significantly lower environmental impacts per t of WEEE for midpoint indicators such as global warming or ozone depletion and the endpoint indicator Eco-Indicator '99 points. A comparison between the environmental impacts of the WEEE recovery scenarios 2009 and 2004, both calculated with ecoinvent v2.01 data, shows that the impacts per t of WEEE in 2009 were slightly lower. This appears to be mainly due to the changes in the treatment of plastics (more recycling, less incineration). Compared to the overall environmental impacts of the recovery scenario 2004 obtained with an old version of ecoinvent (ecoinvent v1.1), the calculation with ecoinvent v2.01 results in an increase of the impacts by about 20%, which is primarily the consequence of a more adequate modeling of several WEEE fractions (e.g. metals, cables or CRT devices). In view of a further increase of the environmental benefits associated with the Swiss WEEE collection and recovery systems, the recovery of geochemically scarce metals should be further investigated, in particular.