分离技术的进展

本文概述了基于生物技术的发展、超纯材料的制备等对发展分离科学和技术的需求,特别是从大量基体物或稀溶液中提取、分离、纯化和检测低含量物质要求发展高选择性的分离技术和相应的分离体系。在发展和完善原有分离技术(如萃取、离子交换、吸附、吸收等)的同时,超临界萃取和膜分离技术具有引入的应用前景。还应注意两种或多种分离技术相结合的分离方法和技术的研究。     

Profiling selected paths with loops

Path profiling records the frequency of each path in an executed program.To accomplish profiling,probes are instrumented in the program and executed as the program runs.So,the number of probes has a significant impact on the efficiency of a profiling technique.By profiling only the interesting paths,existing techniques try to improve the profiling efficiency by reducing the number of probes and optimize path encodings for efficient storage.However,they lack accuracy,waste time on running uninteresting paths,and can mainly deal with acyclic paths.In this article,a novel technique called Profiling Selected Paths(PSP)is introduced to profile selected paths,which enables custom selection for both acyclic and cyclic paths and increases the execution efficiency by early termination on uninteresting paths.Theoretical analysis and experimental evaluation indicate that PSP performs better than existing techniques.     

基于PLC的港口集装箱码头装卸模型下位机控制系统设计

根据港口集装箱码头装卸作业的实际情况,基于PLC,设计装卸模型所对应的下位机控制系统,并介绍设计过程中的技术要点、注意事项.     

关于可信软件开发的若干问题思考

在信息科学时代,现代社会的发展日益依赖软件,实现可信软件的开发在一定程度上契合现代社会的需求,也是自身发展的内部需求。但是,可信软件的开发是一个系统而复杂的过程,强调可信软件开发中各方工作的有效落实。本文分析了可信软件的研究现状,阐述了软件架构与开发,并基于此,论述了强化软件架构,开发可信软件的若干建议。本文旨在强化对可信软件的认识,并为今后相关领域的研究提供一定的参考资料。     

Adaptive neural network control for a class of continuous stirred tank reactor systems

In this paper, the control problem of continuous stirred tank reactors （CSTR） is studied. The considered CSTR are required to contain unknown functions and unknown dead zone input. An adaptive controller that uses the neural networks （NNs） is provided to solve the unknown terms. The proposed approach overcomes the effect of the dead zone input. The dead zone input in the systems is compensated for by introducing a new Lyapunov form and Young＇s inequality. The backstepping procedure is exploited to implement controller design with adaptation laws. The stability is analyzed using Lyapunov method. The performance is examined for CSTR to confirm the effectiveness of the proposed approach based on computer simulation.     

高校计算机系统数据安全问题及应对策略

针对高校计算机系统数据的主要构成,分别从高校办公网络、图书馆以及校园一卡通系统,分别论述了高校计算机系统数据安全问题,并针对这些问题,结合高校计算机系统网络安全技术现状提出了对应的应对策略,对提高高校计算机网络系统数据安全起到一定的作用。     

由计算机技术与数字艺术专业的关系引发的思考

近年来,广东省把动漫、会展等专业作为新兴行业,在全省技工院校进行免费招生,即省财政给予这些专业相应的财政补贴,学生则可以免交约两年学费。为此,广东省各级技工院校多数都开设了这类专业并进行招生,其中有一些已经拥有这类专业几十年办学经验的院校,也不乏有依靠政策支持儿新开设这类专业的院校。数字艺术是建立在电脑硬件和数字艺术软件基础之上的,所以数字艺术的发展也依附它们,也有很多软件公司走在了前面,随着各国的经济明显好转,产品开发的脚步正在加快,商业美术设计领域将进一步获得巨大发展,相对应的必然是需求大量专业人才,Graphic Design显然是具有灿烂的就业前景。     

信息系统性能测试方法初探

信息系统的性能已经成为衡量企业信息系统建设水平的一个重要指标。目前不少企业在系统上线前进行性能测试,但由于缺少一套科学的测试流程和方法,企业投入的人力物力很多,但实际效果却不甚理想。本文主要介绍性能测试标准流程,该流程已在浙江电力企业实施,具有良好的实用价值。     

利用C_5开发叔戊基甲醚

介绍了利用C_5生产汽油抗爆剂叔戊基甲醚的工艺进程。其中KOCH公司开发的催化蒸馏工艺是目前最先进的工艺。我国当前尚未有工业化生产叔戊基甲醚的装置。利用流化催化裂化C_5生产叔戊基甲醚是急待开发的课题。     

Coupled oscillations of H2/O2/CO on silica supported rhodium catalyst

Self-sustained oscillations obtained during the catalytic oxidation of CO and H₂ were studied over Rh/SiO₂ by an FTIR-mass spectrometric technique. An average oscillatory period of 7.1±0.5 minutes was obtained for the CO/O₂ reaction at 348 K. For the H₂/O₂ oscillatory reaction the period was observed to be 1.3±0.8 minutes. When the oscillations were coupled at the same temperature, the period for both the CO/O₂ and the H₂/O₂ reactions was observed to be 7.9±0.8 minutes. The kinetic coupling of the reaction rates is explained by considering the periodic fluctuations in surface temperature which occur as a result of the more exothermic CO/O₂ reaction.