一种新的基于全拼的模糊匹配算法

文字模糊匹配技术是计算机文本处理中一项重要的应用,在欧美国家被广泛研究。然而,中文以其独特的复杂性,使其难以由传统的模糊匹配技术准确高效的实现。此文旨在设计并检验一种创新的汉字的模糊匹配方法,能够有效地匹配关键字并屏蔽敏感词甚至其音近字。这种方法基于建立一个匹配表和一个路径状态转换体系,凡是满足特定路径的,均判断为匹配成功,文中将详细介绍此算法基于C语言的实现。这一方法定位清晰,实现简单,成本微小,能在日益庞大的计算机互联网文字处理中起到积极作用。     

“平头型”掏挖基础在输电线路工程中的应用

笔者就输电线路工程设计中有关掏挖基础应用时常遇到的几个问题作特别提出,并通过对相关规范、资料等的分析理解,结合国网公司“两型三新”输电线路的设计导则,提出与常规设计相反的思路,即原状土掏挖基础宜采用“不露头”的个人观点,供各位同行作参考.     

平板玻璃生产线多线联合布置

文章简单叙述了多条(2～3条)平板玻璃生产线合建在一座厂房内的优点,并针对不同类型的平板玻璃生产线多线联合布置的特点,提出了参考和建议。     

PCB图形转移线干膜宽损耗的研究

运用正交实验法对图形转移干膜线宽损耗进行了分析,确定了影响干膜线宽损耗的主要因素,得出了最佳生产条件。通过验证实验及直观图验证了实验结果。     

Selective laser sintering/melting (SLS/SLM) of pure Al,Al–Mg,and Al–Si powders: Effect of processing conditions and powder properties

Selective laser sintering/melting (SLS/SLM) processing difficulties of aluminium powders had been attributed to issues associated with laser–materials interaction only while neglecting the role of powder properties. This study provides a wholistic understanding of factors that influence the development of SLS/SLM processing window, densification, and microstructure of pure Al, Al–Mg, and Al–Si powders, fabricated in single and multiple layer parts by exploring the roles of processing and material parameters. It was demonstrated that similarities existing in the SLS/SLM processing maps of the powders could be attributed to similarities in their packing densities with the alloying addition of magnesium and silicon having no predominant effect on their processing maps’ boundaries. Rather, alloying addition has significant effect on the nature of the evolved surface morphology of SLS/SLM processed aluminium powders in their processing windows. In addition, the flow and solidification behaviour of the melt pool of the powders during single layer scan was strongly influenced by the particle morphology and oxygen content of the powders as well as applied energy density. The energy density in the range of 12–16 J/mm² was found to be the threshold below which SLS was predominant and above which SLM occurred for the investigated powders. Moreover, successful oxide disruption phenomena which is necessary for inter-particulate coalescence in multi-layered SLS/SLM processed aluminium powders are found to be mainly controlled by the amount of oxide in the as-received powder, the degree of the uniformity of the distribution of the surface oxide film covering the aluminium particles, the nature of thermal mismatch existing between the oxide film and the parent aluminium particle which was dependent on the phase present in the oxide film. Al–12 wt% Si powder is hereby affirmed as a suitable candidate material for SLS/SLM process due to its low thermal expansion and uniform distribution of its surface oxide films as well as the mullite phase in its oxide film.     

Colour appearance of room colours

Psychophysical experiments were conducted to investigate the colour appearance changes between small colour patches and real room colours. The results clearly showed that colours appear lighter and more colourful for room colours. A method based on CIECAM02 was developed to quantify the colour size effect. © 2010 Wiley Periodicals, Inc. Col Res Appl, 2010     

浅谈新车型涂装生产准备通过性分析

以奇瑞公司某涂装线为例,对新车型在该涂装线进行生产试制前的非标及机械化设备的通过性进行分析介绍。     

Using discrete optimization for designing dental shade guides

A key criterion in the design of dental shade guides used for matching tooth color is that the shade tabs cover the natural tooth color space as completely as possible with a manageable number of tabs. Earlier studies have designed hypothetical shade guides from a given population of tooth colors described in the CIELAB system using the goal of minimizing the mean coverage error. In this study, we investigate this topic using the goal of maximizing coverage, meaning that as many measured colors as possible were within a given color difference from the nearest shade tab of the guide. We use techniques of linear discrete optimization to determine the positions of the shade tabs and consider both color difference formulas, CIELAB and CIEDE2000, in an exemplary tooth color population. We obtain coverage error and coverage figures for hypothetical shade guides of various numbers of tabs designed with the goal of either minimizing coverage error or maximizing coverage. Results show that discrete optimization and the goal of maximizing coverage could be used to improve shade guide development. The described technique could be used not only for dental shade guides development, but also for any purpose requiring coverage of as many colors as possible while keeping the number of reference colors manageable. © 2009 Wiley Periodicals, Inc. Col Res Appl, 2010     

大型相交管体类零件数控加工技术研究

分析了两相交管体类零件数控加工的难点,阐述了利用UG软件固定轮廓铣功能的进行相关零件加工的原理与特点,并结合实例说明了利用其进行管体相贯区域加工的一般步骤与方法。     

铁路客运专线连续梁上跨公路桥施工技术

结合具体工程实例,通过对跨桥施工方案的比选和计算,确定了墩梁式的支撑结构形式,并介绍了客运专线上跨公路桥的施工工艺,可为同类工程施工提供参考和借鉴。