高速公路路面养护与机械

沥青混凝土路面作为高等级路面,在其寿命周期内,如何进行科学、有效的养护,是一个十分重要的课题.从费用-效益比的角度,阐述了预防性养护的重要性和必要性,并阐述了养护作业所配备机械,进而说明了养护机械化的可行性.     

清水冲刷推移质输沙率变化规律

分析恒定清水冲刷水槽试验资料发现,推移质输沙率变化可分为两个阶段,即时均稳定阶段和衰减阶段。通过机理分析,建立了该两个阶段的计算公式,计算结果与试验资料吻合良好。该式可用来估算任一河段及任一时刻推移质输沙量及冲刷剖面。     

关于非均匀沙悬移质不平衡输沙问题

本文从水流挟沙能力基本概念出发,根据非均匀沙悬沙与床沙交换的基本形式,导出了非均匀沙平衡及不平衡输沙时水流挟沙能力基本公式,进一步揭示了非均匀沙输沙机理.文中理论较完善,概念较清晰.公式简明.适用范围广.可用于一、二维泥沙数学模型.     

11.5米吃水海船进出南京及以下港口可行性研究

长江南京以下12.5米深水航道建设工程被列为国家"十二五"的重点工程,深水航道通达南京完善工程将于2015年建成。长江引航中心对11.5米吃水海船进出南京燕子矶以下各港进行了可行性研究,为12.5米深水航道向上延伸积极准备相应的引航能力。     

火电厂单元机组经济指标在线监测及能耗分析系统

利用热平衡法、等效热降理论和偏差分析法，对火力发电厂的锅炉效率、汽轮机效率、管道效率、辅机效率等进行了计算，得出机组的经济性指标，并实现了火电厂单元机组经济指标在线监测及能耗分析系统功能．系统实际运行良好，使电厂运行人员和管理人员实时了解机组运行状况，实现经济运行和强化生产管理．     

用QR分解进行矩阵力法计算

本文对矩阵力法提出了新的算法。用该算法求解杆系结构可不必确定基本结构,且能获得稳定的数值解。在有限维矢量空间理论的基础上,本文对该算法的结构力学意义进行了讨论。     

Predictive Model for Corrosion Rate of Oil Tubes in CO2／He S Coexistent Environment Part Ⅰ： Building of Model

Based on an analysis of the existing models of CO2 corrosion in literatures and the autoclave simulative experiments, a predictive model of corrosion rate (γcorr ) in CO2/H2S corrosion for oil tubes has been established, in which γcorr is expressed as a function of pH, temperature (T) , pressure of CO2 ( Pco2 ) and pressure of H2S (PH2S). The model has been verified by experimental data obtained on N80 steel. The improved features of the predictive model include the following aspects: ( 1 ) The influence of temperarare on the protectiveness of corrosion film is taken into consideration for establishment of predictive model of the γcorr in CO2/H2S corrosion. The Equations of scale temperature and scale factor are put forward, and they fit the experimental result very well. (2)The linear relationship still exists between In γcorr and In Pco2 in CO2/H2S corrosion ( as same as that in CO2 corrosion). Therefore,a correction factor as a function of PH2s has been introduced into the predictive model in CO2/H2 S corrosion. ( 3 ) The model is compatible with the main existing models.