单位时间内位移的增量就是速度。速度包括线速度和角速度，与之相对应的就有线速度传感器和角速度传感器，我们都统称为速度传感器。 旋转式速度传感器的结构和特征 旋转式速度传感器按安装形式分为接触式和非接触式两类。 1：接触式 旋转式速度传感器 ...

Abstract: The direct current resistivity method is a primary technique for detecting water-bearing structures ahead of tunnel and coal mine excavation faces. We propose a dipole array advance ...

Abstract: This article proposes a novel, simple design scheme for filtering dipole antennas using asymmetric parasitic elements. Traditionally, filtering dipole antenna uses a parasitic component to ...

Sam – an ex-science teacher – uses his physics degree and five years of experience at Which? to test everything from beard trimmers to electric bikes and trampolines. The best remote-control (RC) car ...