一种并行中英文混合多模式匹配算法

针对中英文混合文本的匹配准确性及大规模数据文本的匹配效率等问题,基于经典的线索化完全哈希特里树算法,提出一种并行化的中英文混合多模式文本匹配算法。采用拆分文本降低多模式匹配算法的串行度,进而在拆分出的小文本上并行地执行文本匹配。通过并行化预处理过程,设计新的存储结构。实验结果表明,该算法在保证结果正确的前提下,执行效率高于经典的串行匹配算法,当数据规模达到226个字符时,可以获得8倍以上的加速比。     

Arithmetic computation in the tile assembly model: Addition and multiplication

Formalized study of self-assembly has led to the definition of the tile assembly model [Erik Winfree, Algorithmic self-assembly of DNA, Ph.D. Thesis, Caltech, Pasadena, CA, June 1998; Paul Rothemund, Erik Winfree, The program-size complexity of self-assembled squares, in: ACM Symposium on Theory of Computing, STOC02, Montreal, Quebec, Canada, 2001, pp. 459–468]. Research has identified two issues at the heart of self-assembling systems: the number of steps it takes for an assembly to complete, assuming maximum parallelism, and the minimal number of tiles necessary to assemble a shape. In this paper, I define the notion of a tile assembly system that computes a function, and tackle these issues for systems that compute the sum and product of two numbers. I demonstrate constructions of such systems with optimal Θ(1)$\Theta \left(1\right)$ distinct tile types and prove the assembly time is linear in the size of the input.     

基于测度贴近度的电子剪切散斑轮胎检测

本文把测度贴近度的概念引进到电子剪切散斑检测中,提出了一种基于测度贴近度的条纹形成算法。该算法大大地消除了条纹可见度对光照强度的依赖,提高了电子剪切散斑无损检测对工业环境的适应性,并且该算法可以在条纹产生的同时对其进行滤波,减轻了后续工作。本文从数学分析和实验两个角度证实了该算法的以上特点。     

预拌砂浆在天安门石材步道的应用研究

＂十二五＂期间预拌砂浆是发展的重点对象。本文首先介绍了预拌砂浆的优势、发展以及生产工艺特点;以天安门花岗岩步道砖用预拌砂浆为例,重点论述了砌筑砂浆和地砖胶粘剂的组成和性能特点,并经试验检测得出该预拌砂浆性能质量优良,能满足施工要求;最后阐述了花岗岩步道砖的施工过程,对推广预拌砂浆的应用具有重要的意义。     

Photocatalytic degradation of methylene blue and acetaldehyde by TiO<Subscript>2</Subscript>/glaze coated porous red clay tile

Nanosized TiO₂ sol synthesized by sol-gel method was successfully coated on the porous red clay tile (PRC tile) with micrometer sized pores. PRC tile was first coated with a low-firing glaze (glaze-coated PRC tile) and then TiO₂ sol was coated on the glaze layer. A low-fired glaze was prepared at various blending ratios with frit and feldspar, and a blending ratio glazed at 700 °C was selected as an optimum condition. Then TiO₂ sol synthesized from TTIP was dip-coated on the glazed layer (TiO₂/glaze-coated PRC tile), and it was calcined again at 500 °C. Here, these optimum calcination temperatures were selected to derive a strong bonding by a partial sintering between TiO₂ sol particles and glaze layer. Photocatalytic activity on the TiO₂/glaze-coated PRC tile was evaluated by the extent of photocatalytic degradation of methylene blue and acetaldehyde. Methylene blue with the high concentration of 150 mg/l on the surface of TiO₂/glaze-coated PRC tile was almost photodegraded within 5 hours under the condition of average UV intensity of 0.275 mW/cm₂, while no photodegradation reaction of methylene blue occurred on the glaze-coated PRC tile without TiO₂. Another photocatalytic activity was also evaluated by measuring the extent of photocatalytic degradation of gaseous acetaldehyde. The photodegradation efficiency in TiO₂/glaze-coated PRC tile showed about 77% photocatalytic degradation of acetaldehyde from 45,480 mg/l to 10,536 mg/l after the UV irradiation of 14 hours, but only about 16% in the case of the glaze-coated PRC tile.     

Experimental tile with phase change materials (PCM) for building use

The use of phase change materials (PCM) and their possible architectural integration is a path in the search for optimizing energy efficiency in construction. As part of this path, a pavement has been designed which, in combination with the PCM, serves as a passive thermal conditioning system (new patent n°. ES2333092 A1) [1]. The prototype has been tested experimentally and the results proved that it is a viable constructive solution improving the energy performance of sunny locals.     

免烧砖自动生产设备液压回路系统设计分析

随着城市建设的不断发展,道路建设对强度高,成本低的免烧砖的需求量与日俱增,传统的生产设备已无法满足需求,因此需要研发能够适应大产量、高质量的生产装备。提出一种自动挤压成型方案,采用系统参数设计理论和AMESim系统仿真技术,完成免烧砖自动生产设备模压成型液压回路的系统设计以及给出主要元件的选型计算。基于AMESim的HCD液压元件设计库建立系统回路仿真模型,分析各回路系统运动特性和流量特性,并验证系统设计的合理性。     

陶瓷墙地砖坯体强度分析和强度影响因素及坯体压制特征探讨

根据力学理论综合分析了墙地砖坯体强度的形成机理及影响坯体强度的因素,如层裂、含湿度、致密度等.并对坯体强度与致密度;致密度与压制力及坯料之间的关系以及层裂对强度的影响进行了简要的分析.最后对满足坯体强度压制特征作了初步探讨.     

Automatic registration of ceramic tiles for the purpose of fault detection

An algorithm is presented for the automatic surface inspection of ceramic tiles for detection of faults in the deterministic patterns printed on them. The algorithm is based on the phase correlation method used to register the reference and test images. Received: 13 January 1997 / Accepted: 20 September 1999