铁铝酸盐复合膨胀水泥化学预应力机理及其应用研究

本文阐述铁铝酸盐自应力混凝土的主要物理力学特征.研究了限制膨胀应变与配筋率之间的定量函数关系.通过正交试验和方差分析,确定了复合外加剂对其性能的影响.针对其在自应力管中的应用,提出多层中空圆柱理论计算模型,按弹性理论计算出自应力管初始应力分布规律.对比以前的线性理论计算误差,给出相应的修正系数.本文对类似的自应力混凝土,具有普遍的指导意义.     

虚拟红外成像器件的模拟输出电路设计

虚拟红外成像器件是能输出红外图像数据源的器件,在调试图像采集系统的硬件和软件时能替代非制冷红外焦平面阵列。虚拟成像器件的输出具有很好的线性度和精度,可作为图像采集电路的标定器件。文设计了虚拟红外成像器件的模拟输出电路,根据UL03401性能参数,设计了信号调理电路,通过在FPGA上使用ROM中查表方式校正模拟端口输出误差,在实际应用中表现了良好的精确性。     

不同控制策略的小功率Boost-APFC性能研究

为了使用于小功率场合的功率因数校正电路的综合性能最优化,本文研究了采用电流断续模式或临界断续模式和电流连续模式的小功率Boost-APFC的各项性能。通过仿真分析和实验比较相结合的方法,定量给出了各电路在输入电流特性、效率、EMI滤波等性能上的具体差异,并且考虑了使用SiC二极管后对电路性能的影响。     

基于模糊逻辑控制技术的移动机器人路径跟踪中的偏差纠正

本文在分析移动机器人在路径跟踪中所产生的３种误差之间关系的基础上，提出了基于两个模糊子控制器的移动机器人路径跟踪纠偏的新方法．该方法简化了移动机器人的纠偏控制过程，改善了控制算法的实时性，提高了移动机器人的路径跟踪精度．     

关于丢番图方程x^3±1=2Dy^2

给出了当Ｄ含６ｋ＋１型素因子时，方程ｘ＾３±１＝２Ｄｙ＾２无正整数解的充分性条件。     

Overconfidence in Interval Estimates.

Judges were asked to make numerical estimates (e.g., "In what year was the first flight of a hot air balloon?"). Judges provided high and low estimates such that they were X% sure that the correct answer lay between them. They exhibited substantial overconfidence: The correct answer fell inside their intervals much less than X% of the time. This contrasts with choices between 2 possible answers to a question, which showed much less overconfidence. The authors show that overconfidence in interval estimates can result from variability in setting interval widths. However, the main cause is that subjective intervals are systematically too narrow given the accuracy of one's information-sometimes only 40% as large as necessary to be well calibrated. The degree of overconfidence varies greatly depending on how intervals are elicited. There are also substantial differences among domains and between male and female judges. The authors discuss the possible psychological mechanisms underlying this pattern of findings. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

建筑工程预结算审核的体会

建筑工程预结算的审核是合理确定工程造价的必要程序及重要手段,高素质的从业人员,齐全的工程造价资料,正确的审核方法,全面的审核内容是合理确定工程造价的条件,提高工程预结算审核的水平能达到有效控制工程造价的目的。     

Maximization of average number of correctly received symbols over multiple channels in the presence of idle periods

In this study, optimal channel switching (time sharing) strategies are investigated under average power and cost constraints for maximizing the average number of correctly received symbols between a transmitter and a receiver that are connected via multiple flat-fading channels with additive Gaussian noise. The optimal strategy is shown to correspond to channel switching either among at most three different channels with full channel utilization (i.e., no idle periods), or between at most two different channels with partial channel utilization. Also, it is stated that the optimal solution must operate at the maximum average power and the maximum average cost, which facilitates low-complexity approaches for obtaining the optimal strategy. For two-channel strategies, an upper bound is derived, in terms of the parameters of the employed channels, on the ratio between the optimal power levels. In addition, theoretical results are derived for characterizing the optimal solution for channel switching between two channels, and for comparing performance of single channel strategies. Sufficient conditions that depend solely on the systems parameters are obtained for specifying when partial channel utilization cannot be optimal. Furthermore, the proposed optimal channel switching problem is investigated for logarithmic cost functions, and various theoretical results are obtained related to the optimal strategy. Numerical examples are presented to illustrate the validity of the theoretical results.     

基于数理统计的高精度CO2传感器校正方法

对工程中求取可靠的插值节点提出一种基于数理统计的方法。对足够的稳态数据进行卡尔曼滤波处理,把经过滤波后的稳态数据进行概率分布分析后,通过拟合优度检验判定测量数据的分布类型并求出合理值(数学期望)作为插值节点。以此方法处理检测区间内的采样点,得出传感器特性曲线。对某种CO2数字传感器进行实验验证,通过与传统的求均值方法进行比较,结果表明:该方法能够更加精确地估计出真实值,比普通均值拟合精度提高13%。     

线纹尺安装方式对空气折射率实时修正效果的影响

根据三种实际测量情况进行分析,介绍了在使用激光干涉法测量线纹尺过程中,空气折射率实时修正技术对测量结果的影响与仪器布局和线纹尺安装方式的关系,并得出了相应的结论.