低渗透气田产量递减评价方法研究

低渗气田气井产量波动较大,在Arps产量递减分析中较难确定递减类型。尝试采用奇异点剔除、开井时率校正等气井生产数据前处理方法,以减小气井产量波动对递减规律分析结果的影响;同时,利用气井动储量作为递减类型判识依据,提高递减类型判识的可靠性。     

10kV配电网自动化仿真模拟系统的设计

随着供电要求的不断提高,城市供电中配电网的自动化水平得以迅速提升,为加强对配电网运行现象的研究和提高运行管理水平,极为需要建立一套配电网自动化仿真模拟系统.采用先进的计算机技术、通信技术和物理模拟手段实现10kV配电网自动化的仿真模拟,可以有效地对配电网工作状况进行模拟和研究,同时实现对配网工作人员的业务培训.     

考虑降雨的下垫面变化对径流的影响分析

以下垫面覆被条件变化来表征的人类活动是水文循环研究中的核心问题,对流域发电、水资源管理以及社会经济可持续发展起到至关重要的影响。本文采用趋势分析法分析右江水电站控制流域内的年降雨量以及年径流量的变化特征及趋势,在利用Arc GIS分析流域下垫面变化的基础上,分别采用多元统计模型和考虑降雨的多元统计模型对径流系数进行模拟。结果表明年降雨量与年径流量的总体变化趋势是一致的,对年径流影响最大的要素是年降雨量,将降雨作为自变量放入回归模型后,模型拟合效果明显提高。     

Experimental study on the time-dependent dynamic mechanical behaviour of C60 concrete under

To study the dynamic mechanical behavior of C60 concrete at high temperatures, impact tests under different steady-state temperature fields (100, 200, 300, 400 and 500.℃) were conducted under a variety of durations at the corresponding constant high temperature, namely 0, 30, 60, 90 and 120.min, employing split Hopkinson pressure bar (SHPB) system. In addition, the impact tests were also conducted on the specimens cooled from the high temperature to the room temperature and the specimen under room temperature. From the analysis, it is found that C60 concrete has a time-dependent behavior under high-temperature environment. Under 100, 200, 300, 400 and 500.℃ steady-state temperature fields respectively, as the duration at the corresponding constant high temperature increases, the dynamic compressive strength and the elastic modulus decrease but the peak strain generally ascends. After cooling to the room temperature, the dynamic compressive strength and the elastic modulus descend as well, but the peak strain increases first and then decreases slightly, when the duration increases. For specimens under and cooled from the high-temperature, as the temperature increases, the dynamic compressive strength and the peak strain raise first and then reduce gradually,and the dynamic compressive strength of specimen under high temperature is higher than that of the specimen cooled from the same high temperature.     

一种新型LED驱动器的分析与设计

传统的具有功率因数校正(power factor correction,PFC)功能的DC输出LED驱动器需要在输出端用容值较大的电解电容来减小输出电流纹波。为解决电解电容的使用寿命短而造成驱动器寿命低于LED寿命的问题,采用一种新型的AC LED拓扑电路结构,理论分析了该拓扑电路结构以及参数的选取。由于该驱动器的输入电压和输出电压都是脉动的,驱动器的输入输出滤波可采用容值较小的薄膜电容,从而提高了驱动器的使用寿命。通过仿真和试验的结果表明,该拓扑电路结构是可行的,其参数的选取是正确的。     

一种数字频率特性测试仪的设计

设计了一种基于正交调制原理的数字频率特性测试仪,系统用稳态响应法测量电路的频率特性.单片机作为主控芯片,完成系统的总体控制及数字信号处理;使用集成的直接数字频率合成芯片输出全频率范围内的正弦波.系统对待测电路的输入信号及其输出响应采样,经数字信号处理后,获得电路的幅频特性和相频特性.设计的测试仪测某RLC网络,中心频率的相对误差小于0.2%,有载品质因数相对误差小于1.25%,最大电压增益大于-1 d B.频率特性测试仪输入输出阻抗均为50Ω,幅频误差绝对值小于0.5 d B,相频误差绝对值小于3°,测试仪能满足微机械谐振传感器特征参数测试需求.     

NaEuF_4微米晶的水热合成与表征

以柠檬酸钠(Na3Cit)为螯合剂和形貌控制剂,通过水热方法成功合成了尺寸均匀的六角形NaEuF4微米晶.采用X-射线粉末衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、能量色散X射线(EDX)和光致发光光谱(PL)对所得产物的结构、形貌以及发光性质进行分析.XRD和SEM分析表明:所得NaEuF4微米晶为六方相,颗粒较均匀.NaEuF4微米晶的尺寸和形貌可通过改变Na3Cit的量和反应时间进行调整.提出NaEuF4微米晶的可能形成机理,并研究其光致发光光谱性质.     

碱金属在白云鄂博铁精矿还原中的催化作用研究

利用失重法对碳的气化反应、CO气体以及碳还原白云鄂博铁精矿进行了实验,使用矿相、XRD分析了还原后样品的相组成与显微结构。研究结果表明：加入催化剂后,碳的气化反应速率和铁精矿还原速率提高,且K2CO3和Na2CO3的催化效果明显优于CaCO3的催化效果。催化剂的加入有助于碳的活性提高,加速了碳的气化反应,从而促进了白云鄂博铁精矿还原反应进行。     

Across and along-wind responses of tall building

Most modern tall buildings using lighter construction materials are more flexible, which can lead to excessive wind-induced vibrations resulting in occupant discomfort and structural unsafety. It is necessary to predict and mitigate such wind-induced vibration at the preliminary design stage. Fluctuating across and along-wind loads acting on a tall building that could not be formulated theoretically were simulated numerically in the time domain using known across and along-wind load spectra. These simulated wind loads were used to estimate the across and along-wind responses of a tall building, which are less narrow-banded processes, based on the state space variable approach. The simulated across-wind response of root-mean-square value（0.0047） and that of KAREEM＇s（0.0040） and the simulated along-wind response of root-mean-square value（0.021） and that of SOLARI＇s（0.027） were compared. It is found that these are good approximations of closed form responses. Therefore, these numerically simulated across and along-wind loads can be used for across and along-wind responses estimation for the wind-resistant design of a tall building at the preliminary design stage.     

1000MW燃煤锅炉富氧燃烧改造及NO_x排放的数值模拟

针对燃煤锅炉富氧燃烧改造的可行性以及NOx排放的问题,提出基于CFD数值模拟方法,开展1 000MW双切圆式燃煤电站锅炉的富氧燃烧改造及其NOx排放的数值模拟研究.结果表明,当氧气体积分数为30%的富氧燃烧条件下模拟的炉膛温度分布、换热结果与改造前空气燃烧时相当.绝热火焰温度一致可以作为改造时氧浓度选择的依据.改造后燃料NOx、热力NOx的生成量均显著降低,总NOx生成量可达改造前的47.3%.大量二氧化碳的存在促进还原区煤焦气化反应和燃料氮的析出,削弱了NOx前驱物的氧化,促进NO还原,从而减少NOx生成量.增大燃烬风风率可降低NOx排放.再循环烟气中的NO的还原使NOx净生成量降低44.6%~71.8%.