上海青浦工业园区热电有限公司变频改造浅析

阐述了上海青浦工业园区热电有限公司变频调速技术的特点和发电厂耗能情况,介绍了变频调节的基本原理及节能情况.     

600MW火电机组厂用电率分析及优化措施

通过对比分析两台机组主要辅机在典型负荷下的耗电率,找出厂用电率偏高的原因,采取了一系列节电技改措施,包括凝泵变频技改、电除尘节能技改、空预器漏风治理、给水泵运行方式优化等,取得了很好的效果,厂用电率比2008年降低了0.41%。     

浅谈电力工程施工中的质量管理

电力工程施工质量管理是企业决策者和广大安全工作者都要思考的一个问题,且直接关系到电力施工企业的生存发展,本文浅谈影响电力工程质量的主要因素,并提出电力工程施工中的质量控制措施。     

超超临界电站锅炉用关键材料

讨论了我国电站锅炉向大容量、高参数超超临界机组发展的趋势及对材料的要求.针对这一发展趋势,宝钢开展了超超临界电站锅炉用关键材料的研制.试验数据及生产、供货实绩表明,宝钢已具备了向主蒸汽600℃超超临界电站锅炉受热面关键部件——水冷壁、过热器和再热器整台机组供货能力,替代了进口产品,缩短了我国电站锅炉材料与国外的差距.同时,根据未来我国700℃超超临界机组的发展要求,开展了高温部件所用材料的筛选、研制及评定等,以支撑我国超超临界机组的发展.     

马克思主义公共权力发展理论——公共权力萌芽、异化与回归

公共权力萌芽于维护共同利益的需要,随着生产力的发展和私有制的出现,氏族公共权力被国家公共权力所取代.前国家社会原初公共权力的工具性、民主自治性和道德性慢慢嬗变为统治性、阶级性和强制性的国家公共权力.公共权力出现了异化,公共权力从社会中产生,但是却反过来却凌驾于社会之上.马克思主义公共权力发展理论认为防止公共权力的异化要建立新型政权体制,这个新型政权体制要具有人民执掌公共权力、普选制、罢免制、低薪制以及有效监督机制等特征.但是,纯粹公共权力的回归必须要使国家真正成为整个社会的代表以及消灭私有制.马克思主义公共权力发展理论无疑对我们今天公共权力的行使具有重要的现实指导意义.     

基于用于推进的功率定量分析运输效率的发展趋势(英文)

基于Nakazawa教授提供的有关20世纪70年代到2008年相关船舶数据,对船舶特定输出功率(SOP)进行定量分析,探讨船舶运输效率的发展趋势和制约因素.     

WSN中基于跨层策略的低能耗/高可靠通信问题研究

可靠通信、低能耗是无线传感器网络的热点研究性能指标.为了提升网络的整体性能,首先在物理层、路由层上分别提出功率反馈控制算法与一种路由量度;其次分析了上述两种性能指标内在的矛盾,并在此基础之上设计一种以可靠通信为前提,节约能量的跨层优化算法.研究结果发现,现有的跨层优化算法可以在一定程度上提升网络性能,但是存在局限性;从性能指标内在矛盾出发,合理设计算法才可以在众多矛盾之中找到最优解.     

Improved spectrum sharing algorithm based on feedback control information in cognitive radio networks

In order to avoid the system performance deterioration caused by the wireless fading channel and imperfect channel estimation in cognitive radio networks, the spectrum sharing problem with the consideration of feedback control information from the primary user is analyzed. An improved spectrum sharing algorithm based on the combination of the feedback control information and the optimization algorithm is proposed. The relaxation method is used to achieve the approximate spectrum sharing model, and the spectrum sharing strategy that satisfies the individual outage probability constraints can be obtained iteratively with the observed outage probability. Simulation results show that the proposed spectrum sharing algorithm can achieve the spectrum sharing strategy that satisfies the outage probability constraints and reduce the average outage probability without causing maximum transmission rate reduction of the secondary user.     

Prediction of sites under adaptive evolution in flavin-containing monooxygenases: Selection pattern revisited

Flavin-containing monooxygenase (FMO), like cytochrome P450 (CYP), is a monooxygenase that uses the reducing equivalents of NADPH to reduce one atom of molecular oxygen to water, while the other atom is used to oxidize the substrate. Recently, it was shown that some CYP isoforms have been subject to positive selection. However, it is unknown whether the highly conserved phase I detoxification enzyme, FMO, has undergone similar positive Darwinian selection. We used maximum-likelihood models of codon substitution, evolutionary fingerprinting, and cross species comparison to investigate the occurrence of adaptive evolution in FMO sequences. We used recent genomic data from a range of species, including vertebrates and invertebrates. We present the evidence for the occurrence of adaptive evolution in mammalian FMO 3, 4, 5, and fugu FMOs but not in mammalian FMO 1, FMO 2, frog FMOs, other fish FMOs and invertebrate FMOs. The sites under adaptive evolution were significantly associated with the insertion domain in mammalian FMO 5. We identified specific amino acid sites in FMOs 3–5 that are likely targets for selection based on the patterns of parallel amino acid change. The most likely role of adaptive evolution is the repair of mutations that permitted optimal NADP+ binding and improved catalytic efficiency. The occurrence of positive selection during the evolution of phase I detoxification enzymes such as FMOs 3–5 and fugu FMO suggests the occurrence of both high selection pressure acting on species within their unique habitats and significant changes in intensity and direction (forms of xenobiotics and drugs) resulting from changes in microhabitat and food.     

世纪之交官场叙事勃兴的文化阐释

作为一种小说潮流的官场叙事，在很大程度上是受文学场域众多因素的合力所催生。从权力文化层面来说，当政治伦理的崇高性遭致市侩主义以及个人利益的围逼，某些不良的官场风气导致公信力不断下降时，世俗性话语会自然地消解这种异化的权力关系。从消费文化层面来说，求官保位以及了解官场生态的心理，主流媒体没有见诸公众的“坊间传闻”等话语在某种程度投合了大多读者的阅读期待。从思想文化层面来看，官场叙事在提供反腐与呈现上层建筑政党理想等叙事功能的同时，一定程度上也呈现权力非公共使用时的世俗化生存状态。官场叙事从权力、欲望对人和人性造成裂变的形而上角度传达出对转型期社会文化现象的体察与洞见。