Sun Yining

Onset determination of muscle contraction in surface electromyography signals analysis

This paper introduces the online and offline onset detection problem of muscle contraction and their specialties, and gives some criteria of the performance of onset detection algorithms, then several methods or algorithms in commonly used are analyzed and compared, such as visual decision, mean value comparison, linear regression of low pass filter and sliding window average. And it discusses the decision threshold issue and presents a new maximum value detection algorithm (MVD) based on the bipolar model algorithm is fast and insensitive to background noise, and fit for online detection.

Containerless Heating Process of a Deeply Undercooled Metal Droplet by Electrostatic Levitation

We present the containerless heating process of a deeply undercooled metal droplet by electrostatic levitation. The problem of surface charge loss in the heating process is discussed and specific formulas are given to describe the basic process of charge supplement by the photoelectric and thermoelectric effects. The pure metal zirconium is used to be melted and solidified to analyze the heating process. The temperature-time curve clearly shows the features including melting, undercooling, recalescence and solid-state phase transformation.