统一理论——人工智能研究的新进展

人们一直认为结构、功能和行为是智能系统3个基本支柱,因此形成了人工智能理论的结构模拟、功能模拟和行为模拟三大学派。但是,这些研究留下许多问题：互相之间缺乏沟通,却常有“孰优孰劣”的争论。文中提出了一种全新的研究途径——智能生成的“机制方法”,希望从智能生成的共性机制人手探讨智能的本质。研究发现：在一般情形下,智能生成机制表现为“信息一知识一智能的转换”,由此引出了“知识理论”,并发现了知识的生态结构;更为有趣的是,人工智能的结构模拟、功能模拟、行为模拟3种理论在“机制方法”框架内得到了和谐完美的统一。这为智能科学技术的发展提供了新的理解和新的机会。     

城市客车信息集成控制功能模块的组件化设计

针对城市客车信息集成控制功能模块设计问题,在总结其构成特点的基础上,借助软件工程组件概念和组件设计方法,按组件配置方法设计城市客车信息集成控制功能模块和控制功能模块的组件。最后以实例验证方法的可行性和有效性。     

关于钢桥和混凝土桥梁创新技术的浅见

该文主要从两种桥梁所采用的基材及养护上提出一些新的品种和新的养护措施,来提高桥梁的耐久性和使用寿命。这也是对当前提高新的经济增长点、扩大内需、增加投入、环保节能以获得长期效应的建议和措施。     

Robust stability of neutral systems: A discretized Lyapunov functional method

This paper focuses on the robust stability for time-delay systems of neutral type. A new complete Lyapunov-Krasovskii function (LKF) is developed. Based on this function and discretization, stability conditions in terms of linear matrix inequalities are obtained. A class of time-varying uncertainty of system matrices can be studied by the method. Foundation item: the National High Technology Research and Development Program (863) of China (No. 2006AA05Z148)     

土工格栅在路基加宽中的重要作用

土工格栅在路基加宽中有着重要的意义,本文论述了土工格栅的特点及其工作机理,并结合工程实际,介绍了土工格栅的铺设方法及注意事项。     

两类时滞积分不等式及其应用

本文给出了两类时滞积分不等式,它们是Gronwau不等式以及Bellman-Bihari不等 式的推广。然后以此为工具,讨论了它们在时滞volterro积分方程和高阶泛函微分方 程中的若干应用。      

巴黎RER线与上海R线的对比研究

通过对巴黎RER线与上海R线的形成背景、服务范围、服务功能等方面的分析,比较了两线的功能定位。并从站间距、共线运营、线路设置、运营组织等角度分析比较了线路特点。最后建议上海R线应贯彻“以人为本、按需设置、技术可行、经济合理”的车站基本分布理念;并从线路资源的有效利用,降低建设成本,扩大服务范围的角度出发,在郊区范围内增加市郊铁路制式的支线;对其分段运营模式与贯通运营模式进行深入探讨。     

Mechanical properties and residue stress of four kinds of ZrC coatings prepared by chemical vapor deposition

Four kinds of ZrC coatings with nearly the same thickness have been successfully prepared on graphite substrate by chemical vapor deposition (CVD) through controlling the ratio of inlet reacting gases. From backscattered electron images, it can be inferred that ZrCIII coating has the best tightness of all coatings. Meanwhile, line energy spectrum curve shows that zirconium and carbon elements distribute uniformly along the normal direction of the ZrCIII coating. As for varied microstructures, the coatings show different mechanical properties and residue stress. The strength and elastic modulus of ZrCIII coating were up to 89.57 and 1 192.5GPa, respectively. Those make it near the level of diamond. Value of residue tensile stress of ZrC+C composite coating was only 7.729MPa and that of ZrCIII coatings was 349.632 MPa. The strong combination of small-size grains in ZrCIII coating plays a decisive role to the best mechanical properties. However, strong misfit of lattice between ZrCIII coating and substrate can induce high residue stress.     

Microstructure of hot-dip galvanized Zn-Al-Mg alloy coating

The microstructure of hot-dip galvanized Zn-11%Al-3%Mg-0.2%Si alloy coating was studied in this article. X-ray diffraction analysis revealed the coating is composed by Zn, Al and MgZn₂ phase. Optical microscope (OM) and scanning electron microscope (SEM) observations showed the coating is occupied by snowflake-like dendrite, double hexagonal organization and eutectic. The coating backbone was the dendrite considered to be a phase of hexagonal close-packed (HCP) structure judging form its morphology according to the crystal growth way in the coating. Transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS) researches on the dendrite suggested that an intermediate Zn-Al phase was formed at high temperature, then decomposed into a type of Zn-Al granular eutectoid after cooling down to room temperature, while the eutectoid Zn and Al had a certain crystallographic relationship. The coating solidification process and the grain crystal structure were discussed.     

《一件小事》的两个英译本的语篇衔接对比研究

本文从系统功能语法理论为依托,从语篇衔接入手,分析比较了鲁迅小说《一件小事》及其2个英译文本的语篇上的差异,旨在探讨功能语法在翻译批评中的实用性和可操作性。