承钢高炉寿命的现状及延长寿命的对策

分析了承钢高炉寿命短的原因，并根据高炉冶炼钒钛矿的特点，提出了延长高炉寿命的对策。     

确定混凝土房屋结构抗震等级的规范方法及争议

对比分析了(建筑抗震设计规范》GB50011-2001和(混凝土结构设计规范》GB50010-2002有关条款,给出了确定混凝土房屋抗震等级的方法,指出了确定房屋抗震等级存在异议的情形及本文的看法,探讨了两本规范在确定板柱结构体系房屋抗震等级时的态度差异．本文工作对混凝土房屋结构设计有指导意义。     

重庆渝北御临河流域水体污染现状及防治对策

御临河是位于三峡库区的一条较大的次级河流,根据<三峡库区及其上游水污染防治规划(2001-2010)>的要求,必须进行御临河流域水环境污染治理.通过对重庆市渝北区御临河水环境污染现状调查与评价,分析了御临河水环境污染的原因,提出了御临河水环境污染防治对策.     

High-quality low-complexity wavelet-based compression algorithm for audio signals

Wavelets have recently emerged as a powerful tool for signal compression, particularly in the areas of image, video, and audio compression. In this paper, we present a low-complexity wavelet-based audio compression algorithm that is capable of handling fairly arbitrary audio sources. The algorithm transforms the incoming audio data into the wavelet domain, and compresses data by exploring redundancy in the wavelet coefficients and exploiting the large runs of zeros in the transformed signal. Also there is a possibility of applying a threshold to the non-zero coefficients, thus a further increase in the number of zeros is expected. The audio signal is first preprocessed to scale down the wavelet coefficients. Then the preprocessed signal is wavelet transformed using a bi-orthogonal discrete wavelet transform (DWT) and threshold by applying energy compaction strategy. Encoding represents the threshold coefficients in compact form. A new encoding technique that is easy to implement, and that provides a reasonable compression ratio for a certain acceptable distortion level has been developed to encode the threshold DWT. So, a bit rate can be controlled such that the algorithm operates at virtually any pre-selected bit rate. The motivation of using the bi-orthogonal wavelet transform is that it permits the use of a much broader class of filters, and this class includes symmetric linear phase filters. The superior performance of this algorithm is also demonstrated by comparing it with two other popular audio compression techniques and this meets the requirements of multimedia computing.     

哈锅600MW亚临界电站锅炉新技术研究

哈锅20世纪80年代初引进了美国CE(现ALSTOM)公司的600MW亚临界控制循环锅炉的设计制造技术,成功地设计制造了我国首台平圩电厂600MW亚临界控制循环锅炉,其技术性能指标均达到设计值。投运后期发现过热器、再热器两侧烟气、蒸汽温度存在较大偏差,导致个别管屏超温爆管及减温水超限。经试验研究,找出了汽温偏差的原因,提出了相应的优化措施,重新设计了哈锅第二代产品——盘山电厂3、4号锅炉,锅炉性能更加先进,锅炉效率为93．8％(低位热值),NOx排放量为384mg／m^3。     

Early warning of fault conditions of an over-current protection module in dependable communication applications

This article describes the implementation of early warning feature in an over-current protection module designed for limiting the surge-current in communication applications. The early warning signal is generated by a surge-current sensor and a temperature sensor mounted on the protection module. Described solution decreases fault latency and consequently improves the efficiency of the on-line fault detection mechanism. It can be used for diagnostic on-line monitoring in dependable adaptive computing systems.     

关于我国高炉锰铁发展前景的思考

分析了高炉锰铁产量变化及近期下滑的主要原因,预测了高碳锰铁市场需求,通过对高炉与电炉两种冶炼高碳锰铁方法的对比,认为在我国条件下高炉锰铁发展前景看好．但必须进一步落实资源供应,搞好环境保护,提高技术装备水平,强化冶炼进程,提高我国锰铁高炉的竞争力。     

Query-Sensitive Similarity Measures for Information Retrieval

The application of document clustering to information retrieval has been motivated by the potential effectiveness gains postulated by the cluster hypothesis. The hypothesis states that relevant documents tend to be highly similar to each other and therefore tend to appear in the same clusters. In this paper we propose an axiomatic view of the hypothesis by suggesting that documents relevant to the same query (co-relevant documents) display an inherent similarity to each other that is dictated by the query itself. Because of this inherent similarity, the cluster hypothesis should be valid for any document collection. Our research describes an attempt to devise means by which this similarity can be detected. We propose the use of query-sensitive similarity measures that bias interdocument relationships toward pairs of documents that jointly possess attributes expressed in a query. We experimentally tested three query-sensitive measures against conventional ones that do not take the query into account, and we also examined the comparative effectiveness of the three query-sensitive measures. We calculated interdocument relationships for varying numbers of top-ranked documents for six document collections. Our results show a consistent and significant increase in the number of relevant documents that become nearest neighbors of any given relevant document when query-sensitive measures are used. These results suggest that the effectiveness of a cluster-based information retrieval system has the potential to increase through the use of query-sensitive similarity measures.     

保护地生产条件下的土壤退化问题及其防治对策

通过对保护地土壤退化问题的综合分析可知,退化的根本原因在于①迄今为止保护地生产上尚未建立完善的耕作制度,因此不能很好地解决保护地轮休时的土壤环境问题.②市场的需求与保护地的轮作没有统一起来,连作造成营养元素的失衡、土传病虫害的发生与蔓延.③肥料的盲目过量使用降低了肥料的利用率,在土壤中积累了大量的盐分,加剧了土壤的次生盐渍化.④多数保护地至今仍沿用大水漫灌的灌溉方法,这样不仅浪费大量的水资源,也是土壤次生盐渍化产生的重要原因之一.针对上述问题,提出对策如下首先在保护地轮休前大力推行机械方耕、客土、排土等耕作方法,使土壤得到充分的修复.其次,将市场需求与保护地轮作有机地结合起来,建立适宜于保护地的土壤轮作制度.第三,以有机食品生产的技术标准为依据,实施因土、因作物、因设施的运行情况,统一调配,科学施肥.第四,建立健全保护地的节水灌溉制度和节水技术体系,将节约水资源与改善保护地环境统一起来.通过实施上述综合措施来提高保护地的持续生产能力.     

The equivalence of measures and the correction for attenuation.

In literature reviews and critiques, measures are often evaluated in regard to their conceptual equivalence. In making this evaluation, the empirical correlation between the 2 measures being compared should be corrected for attenuation at least approximately. Unless this correction is applied, alternative measures may be presumed to be importantly different when giving due weight to the unreliabilities present, it may be seen that the identical underlying dimension is being reflected. In psychology, where enough discrepancies already characterize our findings, this interpretive error should not deny us the occasional equivalences that come along. (PsycINFO Database Record (c) 2010 APA, all rights reserved)