基于系统辩识的PID参数自整定

This paper presented a metnod of self-determining PID parameters by using system idenification and gave a engineering sample.     

混合动力汽车动力电池容量特性

针对混合动力汽车动力电池的特点，运用计算机软硬件设备构成测试系统，利用较易实现的电流积分方法来预估电量状态参数SOC，并进行了电池的实际容量特性试验，对电池电压、电流及温度进行了数据采集和监测。结果表明，利用该方法可得到较满意的电池电量状态参数估计。     

黄山松种群拓广遗传参数的研究

利用黄山松种源试验两个试验点的材料,运用多元分析方法所定义的估算拓广遗传参数方法,分别从协方阵和相关阵出发估算了黄山松种群的拓广表型方差、拓广遗传方差、拓广遗传力和拓广遗传通径系数。结果表明使用全部特征根估算拓广遗传参数是不合适的,95％左右的累计贡献率最为适宜。此时所估算的拓广遗传力以协方阵为基础的是0.32～0.48,以相关阵为基础的是0.66～0.87,且从关阵出发所估算的拓广遗传参数可比性强。依据初步分析结果,对估算方法和实践意义进行了较为详细的讨论。     

回归系数的联合回归估计

In this paper, a new biased estimate, which is called the united regression estimate, is proposed for the regression coeffients. Under the given conditions, the proposed estimate, which is found to be superior to the least squares estimate, the principal     

我国货币需求模型的研究

Based on the Friedman''s theory of money demand, the model of money demand at home is discussed using the methods of systems identification. The Clarke model of money demand at home is built. According to the model, the characteristics of money demand at h     

Numerical Modeling to Study the Fate of Nitrogen in Cropping Systems and Best Management Case Studies

Summary

Nitrogen (N) availability for crop uptake is dependent on various factors that influence the transformation of N sources and transport of N forms in soils. The fate and transport of N is site specific. Therefore evaluation of N dynamics under each condition is neither practical nor feasible. Simulation models which are adequately calibrated and tested can be used to estimate the fate and transport of N as well as crop responses under different production systems. These evaluations provide some guidelines as how to manage N and water efficiently to maximize the N uptake efficiency and minimize the losses. Thus, they contribute to the development of N and water best management practices. In this chapter, we discuss recent information on experimentally measuring the water and nutrient transport in soils as well as performing estimations using simulation models. The development and application of different simulation models for different production systems have been summarized. Some case studies on nitrogen and water best management practices are also discussed.     

小麦品种审定中品种的合理评价问题

 以山东和江苏的小麦区试为例，探讨了品种审定中如何公正合理评价品种的问题。⑴品种区试的精确度标准：建议采用CV≤D（n/2）#+（1/2）/t#-α来估计。⑵联合方差分析的统计模型问题：认为年份和试点转换为环境因素的联合方差分析是较好的模型。⑶适应性和稳定性分析：提出b#-i为适应性参数，a#-i为稳定性参数。⑷合理评价品种：推荐采用参数分组估计法。     

荣昌猪的遗传育种参数和育种值估计

本文采用荣昌猪选育试验的数据验证模块的功能和运算的结果,获得了荣昌猪59个性状的遗传力、遗传相关、重复力等遗传参数及8头荣昌种公猪不同性状的育种值等育种参数。这些结果为荣昌猪的选择育种提供了大量的基础参数。     

Joint Parameters Estimation for CDMA Signals

In wireless communications,mobiles emit signals that arrive at a receiver with multiple paths,each with its own direction of arrival(DOA),path delay,fading,and Doppler shift frequency,which influence the quality of communication seriously.These parameters should be taken into account in array signal processing.Based on CDMA signal,a novel Space-Time approach is proposed to estimation the DOA,time delay,and the Doppler shift frequency.Because utilize special signal model about space-time-frequency of mobile communications.The proposed algorithm has simpler structure and high quality of division.The simulation results show the feasibility and effectiveness of the method.