热电偶冷端温度智能补偿与检测

介绍了具有热电偶冷端温度智能补偿的温度检测系统的组成和功能 ,重点阐述了以单片机为核心构成热电偶冷端温度智能补偿的原理和特点 ,说明了软件功能。最后给出了实践结果及主要性能指标。     

热线式空气流量变送器

设计并研制一种热线式空气流量变送器 ,其准确度达到± 1% ,并具有极好的响应速度。     

基于最小连通邻域图的ISOMAP算法

噪音的干扰和邻域大小的不合适会在ISOMAP算法的邻域图中引入“短路”边,使其不能正确表达数据的邻域结构,从而使该算法具有较差的鲁棒性和拓扑稳定性。为此,根据最小连通邻域图能有效避免“短路”边的特点,提出了一种能有效删除“短路”边因而更具鲁棒性和拓扑稳定性的ISOMAP算法——基于最小连通邻域图的ISOMAP（MCNG-ISOMAP）算法。该算法能在一定程度上避免邻域大小难以有效选取的问题,同时还能在不依赖于邻域大小的情况下发现数据真正的固有维数。     

Source Choice Perception and Sustainable Rural Water Supply Development: A Case Study of Ban Thadindam,Lopburi, Thailand

Abstract

This study seeks to examine source choice perception and sustainable rural water supply development in Ban Thadindam, a Thai village situated about 220 km north of Bangkok. It makes use of an elementary schematic matrix that was initially developed for the valuation of water sources as perceived by water users in East Africa. In applying the elementary choice scheme, the author interviewed the village Kamnan (district officer) and a few villagers. The results of this study show that a wide range of water supply sources was perceived by the Kamnan. Out of a practical range of six sources, four were perceived and accepted, roof (rain water), river, spring, and pond; and two were perceived but not accepted: well and canal. The reason why well and canal water sources were rejected was because of their hardness and turbidity. Of the four sources accepted, roof (rain water) was rated very favorably as the preferred choice while river, spring, and pond sources were judged equally favorable. Awareness of source choice and the conditions under which choice is made is crucial for the understanding and development of sustainable rural water supply. By adopting a wide combination of sources and integrating them to provide a rich water supply for treatment, and by taking advantage of filtration technology given by the Asian Institute of Technology, Environmental Engineering Division, the villagers, with the help of the Project Managing Committee, transformed the demonstration filtration facility into a sustainable rural water supply system. The latter succeeded not only in providing adequate filtered water for the majority of the households in Ban Thadindam but also in satisfying the water requirements for the whole village for two decades. The success of the rural water supply system has been attributable to many factors, but most important was the awareness the villagers have in the understanding of the interrelations between landscape, range of choice and the interaction between community participation, technology, and environment.     

流行语“门”族词一词多义的转喻解读

一词多义现象是人类认知发展的结果,文章从转喻视角出发,分析了流行语“门”族词的一词多义现象,用转喻的三种方式解读了流行语“门”族词的一词多义产生的原因,并阐述了影响转喻发生的三大影响因素,进一步帮助人们认识语言的一词多义现象。     

基于Lucene.Net校园网搜索引擎的设计与实现

在庞大的网络信息资源利用中,搜索引擎成为人们发现资源的有力工具。但是如果用常用的搜索引擎去搜索专门的门户网站,或者特定范围的网页,则显得力不从心。比如搜索一个学校内的网页,这些搜索引擎就很难进行全面高效的搜索。基于此,利用适应.Net环境的Lucene.Net作为基础,设计了自己的校园网搜索引擎,在特定范围的搜索表现出了自己独特的优势。     

解读“三个代表”重要思想——仅以时代背景、科学定位和精神实质为视角

“三个代表”是在科学判断世情、国情和党情尤其是党的历史方位的基础上提出的 ;是马克思主义中国化的最新成果 ,是党必须长期坚持的指导思想 ;全面贯彻“三个代表”重要思想关键在坚持与时俱进 ,核心在坚持党的先进性 ,本质在坚持执政为民。     

热阻和内不可逆性对实际闭式燃气轮机回热循环性能的影响(续)

用有限时间热力学方法分析实际热机循环性能，计入工质与高、低温热源间换热器和回热器的热阻损失，压气机和涡轮机中的不可逆压缩、膨胀损失，和管路系统中的压力损失，导出变温热源条件下实际闭式燃气轮机回热循环的功率、热效率与压比间的解析式，并给出了详细的数值算例说明外不可逆性（热阻）和各内不可逆性对循环特性的影响     

中速磨煤机计算中若干问题的探讨(续)

目前工程设计中对ＭＰＳ、ＨＰ等中速磨煤机的计算基本上采用制造厂商提供的规范和方法，但在相同煤质条件下，按不同厂商计算方法所得结果可能出现明显的差异；另一方面，国内用以指导中速磨计算的一些规范也存在着不够明确之处，这些情况都给中速磨的选型、工程计算带来了困难。根据工程设计实践和对电厂试验资料的分析，对中速磨煤机出力计算、煤粉细度、出口风温和风工况等问题进行了讨论，提出了一些新的见解和建议     

内可逆化学发动机最佳功率与效率的关系

分析有限时间约束条件下等温化学发动机的性能，导出内可逆化学发动机最佳功率与效率间的关系和最大功率输出时的性能界限。对化学发动机与热动力循环性能作了比较，并讨论质漏和传质定律对性能的影响