防病毒、防黑客技术

一、计算机病毒及防病毒技术 (一)病毒的概述 计算机病毒是指那些具有自我复制能力的计算机程序,它能影响计算机软件、硬件的正常运行,破坏数据的正确与完整。“计算机病毒”这一概念是1977年由美国著名科普作家雷恩在一部科幻小说《P1的青春》中提出的,随后,人们不断在各种领域使用     

视频图像的GSM远程无线传输

介绍一种适合水利行业远程现场查勘的GSM远程视频图像系统。通过GSM公用移动网络，可实现现场实时图像采集、图像压缩、图像远程传输，辅助提高异地实时决策的正确性和效率。     

WinZip的安装与使用

WinZip是著名的ZIP文件压缩-解压缩管理器,该工具有操作简便、压缩运行速度快等显著优点,能与网络浏览器Internet Explorer和Netscape Communication实现无缝连接,可以大大方便Internet用户进行网上软件的下载、解压。下面我们将给大家详细分解WinZip7.0各个功能的使用。     

碱稳定污泥污水对土壤可提取有机碳和铜的影响

An incubation experiment was conducted to evaluate the potential for water contamination with sludge-derived organic substances and copper following land application of alkaline-stabilised sewage sludge. Two contrasting sludge-amended soils were studied. Both soils were previously treated with urban and ruralalkaline biosolids separately at sludge application rates of 0, 30 and 120 t ha^-1 fresh product. The air-driedsoil/sludge mixtures were wetted with distilled water, maintained at 40 % of water-holding capacity and equilibrated for three weeks at 4 ℃ before extraction. Subsamples were extracted with either distilled wateror 0.5 mol L^-1 K₂SO₄ solution. The concentrations of organic C in the aqueous and chemical extracts were determined directly with a total organic carbon (TOC) analyser. The concentrations of Cu in the twoextracts were also determined by atomic absorption spectrophotometry The relationship between the two extractable organic C fractions was examined, together with that between extractable organic C concentration and extractable Cu concentration. Application of alkaline biosolids increased the concentrations of soil mobile organic substances and Cu. The results are discussed in terms of a possible increase in the potential for leaching of sludge-derived organics and Cu in the sludge-amended soils.     

γ-辐照对施用碱稳定固体土壤中Cu的提取性影响

An incubation experiment was conducted to investigate the microbial biomass associated Cu in four contrasting soils to which an alkaline stabilised sewage sludge cake was applied. The organisms of sludge-amended and control soils were killed using γ-irradiation technique, and the aqueous and acid-extractable Cu concentrations were determined. Addition of the sludge product increased significantly the concentration of both the aqueous and dilute HOAc-extractable Cu in all the irradiated soils compared to the non-sterilised sludge/soil mixtures, but the increase was more pronounced in the dilute acid-extractable Cu, indicating thatthe Cu rendered extractable in water and dilute acetic acid by γ-irradiation existed in the both soil liquidand solid phases. The additional increase in extractable Cu following the biocidal treatment is likely to bedue to release of Cu from the same fraction of soil microbial biomass.     

直升机输电线路应急抢险机载视频系统

以输电线路直升机应急特巡为目的,在直升机具备机载摄像系统的基础上,加装一套图像处理系统和海事卫星传输系统,使直升机上通过摄像系统产生的电网线路的图像可以实时被地面监视中心监控,语音及数据进行实时传输。系统提供双信道,可解决实时图像、数据和高质量图片等大数据量的传输。在整个传输管道中,图像视频以H.264编解码进行传输。     

电力营销管理系统与抄表机之间的集成

该文介绍了一种基于J2EE的电力营销管理信息系统和抄表机的集成解决方案。提出了集成方案的总体设计，阐述了该方案所涉及的ActiveX控件、zlib解压缩、Base64编解码、DBF格式转换组件等关键技术。