基于几何模型系统动态结构图的梅森增益公式用法研究

基于几何模型系统动态结构图求解系统传递函数来定量分析系统的动静态性能.利用梅森公式可一步可求得系统传递函数,但是公式应用起来太繁琐,但若区分好回路是否"相关联"可使问题大大简化.     

基于系统开环频率特性曲线的奈奎斯特判据用法研究

为了解决系统中奈氏曲线、积分环节处理和正负穿越次数等开环频率曲线的特性,基于奈奎斯特判据法,通过画奈奎斯特曲线、正确完善奈氏曲线和应用奈氏判据研究确定系统的相对稳定性,研究得到奈奎斯特稳定判据能够有效判断系统的稳定性,研究结论对于系统相对稳定性的理解提供参考．     

浅谈英语课堂中的常见问题及解决办法

本文对当前多数学校中英语教学课堂上常遏到的一些问题及学习现状进行说明与分析，提出实用可行的对策和建议。     

On the Spirit of Rising Bourgeoisie in Robinson Crusoe

Through the introduction of the historical and cultural background which Robinson lived in,this article analyzes Robinson’s characteristics in detail and depicts his adventure experience on the isolated island vividly.The characteristics of the rising bourgeoisie are showed from his deeds such as his risk-taking courage,his strong vitality,diligence,wisdom and "never giving up".Meanwhile,this article also gives a very penetrating analysis of the relationship of Robinson and "Friday",Friday’s father,a Spaniard and those ringleaders in mutiny,etc.,that is "Master" and "subjects",which reveals the rising bourgeoisie spirit and the colonialist image that contains colonial pioneering,conquering,expanding and extremely strong desire to possess everything he could.