基于PIC＋FPGA飞机直流供电系统设备故障预测研究

针对飞机直流供电系统中直流设备工作情况，本文利用FPGA双进程有限状态机方法控制A／D转换器，快速准确采样多路信号。用模糊理论的建议语言规则，结合PIC单片机的控制优势，从而解决飞机直流供电系统设备故障预测报警。     

Decision-making of Aircraft Optimum Configuration Utilizing Multidimensional Game Theory

As multi-discipline coupling and components interference often affect the aircraft configuration decision-making and analysis during conceptual design process, this article presents an approach of multidimensional game theory based on aircraft components to deal with this problem. The idea is that the configuration decision-making process is regarded as the game for different disciplines and technologies, and the aircraft components are players. The payoff function with highest total gain means that according to the game protocols and multidimensional theory, the optimal aircraft configuration within the strategy set will be chosen. The decision-making model is applied to conceptual design process of the high altitude long endurance (HALE) unmanned aerial vehicle (UAV) based on the assessment of technological risk. The obtained optimum configuration is quite consistent with the current HALE UAV development trends. Thus, taking into account the coupling and interference factors, the multidimensional gaming model based on aircraft components will be an effective analysis method in the decision-making process of aircraft optimum configuration.     

原型理论对中国大学生英语词汇学习的启示

词汇学习是我国大学生英语学习的重点以及难点,传统的机械性背记方法耗时多,收效少。就提高我国大学生英语词汇学习效率这一问题,从认知语言学的原型理论出发,为我国大学生学习词汇提供了更科学,更高效的学习方法。     

Data fusion algorithm based on state and attribute parameter

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UDu~T分解滤波算法及其应用

本文介绍UDU~T 分解滤波算法;用工程师容易理解的方法重新推导时间修正和量测修正滤波公式,并给出标准通用的UDU~T 分解滤波子程序。本算法子程序已实际用于工程估计器中。本算法具有高的数字稳定性。作为UDU~T 分解滤波算法理论和工程应用之间桥梁的本通用标准子程序具有良好性能,使用方便,极易推广应用。     

New evidence for strong non-thermal effects in Tycho’s supernova remnant

For the case of Tycho’s supernova remnant (SNR), we present the relation between the blast wave and contact discontinuity radii calculated within the nonlinear kinetic theory of cosmic ray (CR) acceleration in SNRs. It is demonstrated that these radii are confirmed by recently published Chandra measurements which show that the observed contact discontinuity radius is very close to the shock radius. Therefore a consistent explanation of these observations can be given in terms of efficient CR acceleration which makes the medium more compressible.     

金融服务滞后产业发展的成因及对策——以航空业为例

分析了在战略产业发展过程中金融业服务滞后的各种表现，从战略产业经济结构调整本身、风险约束和金融宏观政策传导三个方面剖析了金融服务滞后的原因。以民用航空制造业的发展为例，用博弈论对金融在支持战略产业发展过程中的两难状况作了理论和实证分析，提出金融支持战略产业的发展是金融发展的最优选择的观点。最后从金融体系、资金投入和金融服务等方面提出相应的对策建议。     

一种新型并联微动机器人运动学分析

提出了一种新型的少自由度微动并联机器人,利用螺旋理论对于微动并联机器人的自由度进行分析,得到机构正常运动时所需要的驱动个数。利用矢量方法得到微动并联机器人的运动学反解。基于雅可比矩阵的可逆性,研究了微动机器人的奇异问题,从而确定该微动并联机器人的输入和输出之间的关系。     

水凝物对THz波辐射的衰减研究

文章基于水凝物粒子尺寸与THz波长的大小关系,分别利用Rayleigh近似、Mie理论以及几何光学方法计算了降雨和云雾引起THz波辐射的散射衰减。比较了不同强度的降雨和不同能见度、含水量的云雾对THz波的散射衰减。结果表明,随着频率的增大,THz波段雨衰减先增大后减小;在整个THz波段,含水量较小或能见度较低的云雾的衰减随频率的增大而单调增加,含水量较大或能见度较大的云雾的衰减随频率先增大后减小;在THz波段云雾衰减随能见度的减小和含水量的增加而增大,温度对THz波段的云雾衰减影响不大,在整个THz波段并不存在明显的规律。在THz波频率高端云雾影响较降雨要严重的多。