In this paper, combined with the idea of Laser Speckle Velocimetry (LSV), experiments are carried out to measure the velocities of nano-particles in directional nanofluids with Zero-Crossing Method.
本文结合激光散斑测速技术（LSV），应用激光散斑过零法对定向流动的纳米流体中纳米粒子的运动状态进行了理论分析及实验研究。
Traditionally, the method of bar code recognition is based on zero crossing of the second derivative.
传统的条码识别方法是通过二阶导数零交叉来定位条码边界。
Wavelet zero crossing representation is investigated. A new and simple method of reconstructing signal from its wavelet zero crossing representation is given.
分析了信号零交叉表示方法，给出了新的由零交叉表示进行原始信号重构的算法。
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