基于智能手机的均质圆弧微振动研究

利用智能手机中phyphox软件和磁力计功能,将磁性小球固定在均质圆弧中心处,测得磁性小球的磁感应强度周期,即为均质圆弧的微振动周期,再把数据导入origin软件,绘制周期图像,计算均质圆弧微振动周期。并对理论值进行修正,测量结果与理论值符合得很好,其相对误差为0.11%。此项工作对于利用智能手机开展复杂系统的微振动研究提供了有效的实验方法。

Oscillation of Neutral Differential_difference Equations with Positive and Negative Periodic Coefficients

Some sufficient conditions are obtained for the oscillation of first order neutral differential_difference equations with positive and negative periodic coefficients.