汽车排放控制系统中的氧传感器现状及展望

介绍了浓差型(Nernst型)、极限电流型和半导体电阻型等汽车排放控制系统中的氧传感器原理及结构。在综合该领域国内外研究现状的基础上,对氧传感器的发展进行了展望。     

应用PLC变频控制的乙炔压缩机

本文介绍了应用西门子公司的LOG01可编程控制器（PLC）和艾墨森生产的变频器技术，使乙炔压缩机可以通过手动或者编程控制实现乙炔压缩机排气量的连续变化或分级输出，实现整机运行过程中的重要参数的实时监控和多项指标的极限报警，满足不同工况下的应用需求，节约能源和成本，提高了效益。     

微机控制励磁在泵站自动化中的应用

在泵站自动控制中,微机励磁系统是非常重要的环节。分析了电机无刷励磁系统存在的问题和微机控制励磁系统的原理、性能特点。根据目前泵站应用情况,得出采用WKLF-41型微机控制无刷系统,可大大改善电机的励磁稳定和可靠性,泵站自动化性能也能得到提高。     

浆砌石衬砌在渠道防渗中的应用及对策

总结了浆砌石应用的历史,介绍了浆砌石的结构特性和施工工艺,从造价方面、防渗效果及施工三方面分析了浆砌石衬砌主要存在的问题,并提出了相应的解决对策,指出浆砌石衬砌在渠道防渗应用中应控制施工质量,从而更好地提高防渗效果。     

提高工程量清单编制质量的思考

文章从如何提高对工程量清单编制工作重要性的认识入手,分析了实现计价理念、计价侧重点和造价控制观念转变的必要性,重点阐述了提高工程量清单编制质量应给予足够重视的几个关键环节。     

On assertion-based encapsulation for object invariants and simulations

In object-oriented programming, reentrant method invocations and shared references make it difficult to achieve adequate encapsulation for sound modular reasoning. This tutorial paper surveys recent progress using auxiliary state (ghost fields) to describe and achieve encapsulation. It also compares this technique with encapsulation in the forms provided by separation logic. Encapsulation is assessed in terms of modular reasoning about invariants and simulations.     

凤滩水电厂自动发电控制策略

介绍了凤滩水电厂自动发电控制(AGC)策略的实现方法,重点介绍了修正等容量比例有功分配方法及相应措施.程序设计的原则是,机组紧跟目标负荷的情况下,在最佳效率下运行,同时减少机组开/停机次数、有功调节频率和跨越振动区次数,从而减少机组磨损,兼顾运行效率和机组运行安全.     

中央空调冷冻水泵变频调速运行特性研究(2):模拟计算与分析

利用前文的分析结果，对采用定压差控制的某空调系统进行了模拟计算，并将计算结果与相似定律所得结果进行了比较，表明直接按相似定律所确定的泵的扬程和能耗均偏低；同时对冷冻水管路系统中的雷诺数Re、沿程阻力系数和管路阻抗等随空调负荷的变化关系，以及空调负荷分布、压差设定值等对冷冻水泵变频运行参数及能耗的影响等方面进行了分析，提出了冷冻水泵变频的最有利及最不利工况，并根据模拟与分析结果对空调冷冻水泵变频调速系统的设计等提出了建议。     

影响钢铁工业主要环境因素及其控制措施

针对钢铁工业的环境因素的影响 ,采取针对性措施控制 ,合理利用 ,清洁生产。     

Temperamental resistance to control increases the association between sleep problems and externalizing behavior development.

This study examined the moderating effects of temperamental resistance to control on the link between development of sleep problems and development of externalizing behaviors over a 5-year period. Resistance to control was assessed with mothers' retrospective reports of temperament in infancy, provided when children were 5 years of age. Sleep problems were assessed with mother reports on an annual basis from age 5 to age 9. Externalizing behaviors were assessed with teacher reports on an annual basis from age 5 to age 9. A cross-domain latent growth curve model indicated that sleep problem trajectories were positively associated with externalizing behavior trajectories only for children high in resistance to control. In addition, resistance to control was positively associated with initial (age 5) sleep problems and initial (age 5) externalizing behaviors. The authors speculate that the development of sleep problems promotes the development of behavior problems for resistant children, whose self-regulatory abilities are especially tenuous. Implications for prevention and treatment of conduct problems are considered. (PsycINFO Database Record (c) 2010 APA, all rights reserved)