Brain signal processing and neurological therapy

Ph.DDOCTOR OF PHILOSOPH

BIOMECHANICAL CHARACTERISTICS OF THE WRIST JOINT MUSCLE IN CHINESE ADULTS

The purpose of this study was to (1) establish the biomechanical characteristics of the wrist muscle in normal Chinese adults, (2) provide scientific information for the evaluation of sports techniques, strength training, sports injuries, and rehabilitation, (3) provide basic data for muscle building, injury and rehabilitation in the general population. A total of 69 adults cross-country participated in this study. The following conclusions were drawn: (1) With increasing angular velocity, peak torque and total work declined, but average power increased, (2) Peak torque, total work and average power of wrist flexion were greater than wrist extension

Development of Giant Magnetoresistive Device with Perpendicular Magnetic Anisotropy

Ph.DDOCTOR OF PHILOSOPH

Acoustic emission localization based on FBG sensing network and SVR algorithm

Abstract In practical application, carbon fiber reinforced plastics (CFRP) structures are easy to appear all sorts of invisible damages. So the damages should be timely located and detected for the safety of CFPR structures. In this paper, an acoustic emission (AE) localization system based on fiber Bragg grating (FBG) sensing network and support vector regression (SVR) is proposed for damage localization. AE signals, which are caused by damage, are acquired by high speed FBG interrogation. According to the Shannon wavelet transform, time differences between AE signals are extracted for localization algorithm based on SVR. According to the SVR model, the coordinate of AE source can be accurately predicted without wave velocity. The FBG system and localization algorithm are verified on a 500 mm×500 mm×2 mm CFRP plate. The experimental results show that the average error of localization system is 2.8 mm and the training time is 0.07 s

Impact Properties Analysis of Bamboo/glass Fiber Hybrid Composites

Six kinds of bamboo/glass fiber vinyl ester hybrid composites with different layers were prepared by vacuum assisted resin infusion (VARI) process. The bending and pendulum properties on them, meanwhile the low-velocity impact and compression-after-impacted response were investigated studied on the energy levels of 7J, 9J, 11J and 13J. The results show that the bending strength, pendulum impact strength and peak impact force of the composite materails with two layers of glass fiber beneath the surface are 120%, 220.68% and 371.38% higher than those of the pure bamboo fiber composite, respectively

Development of high temperature acoustic emission sensing system using fiber Bragg grating

Abstract In some applications in structural health monitoring (SHM), the acoustic emission (AE) detection technology is used in the high temperature environment. In this paper, a high-temperature-resistant AE sensing system is developed based on the fiber Bragg grating (FBG) sensor. A novel high temperature FBG AE sensor is designed with a high signal-to-noise ratio (SNR) compared with the traditional FBG AE sensor. The output responses of the designed sensors with different sensing fiber lengths also are investigated both theoretically and experimentally. Excellent AE detection results are obtained using the proposed FBG AE sensing system over a temperature range from 25 ℃ to 200 ℃. The experimental results indicate that this FBG AE sensing system can well meet the application requirement in AE detecting areas at high temperature