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Full-Text Articles in Engineering

High Temperature Thermodynamic Properties Of Znte(S), Robert F. Brebrick Dec 2011

High Temperature Thermodynamic Properties Of Znte(S), Robert F. Brebrick

Mechanical Engineering Faculty Research and Publications

We have gathered the partial pressure, Knudsen cell, and emf measurements on ZnTe(s) from which the Gibbs energy of formation can be calculated. Published partial pressures of diatomic tellurium have been adjusted to take account of a subsequently published third law analysis of tellurium. The equation used to calculate the total pressure from the rate of mass loss from an extensive set of Knudsen cell measurements has been corrected to give a 5% increase in total pressure and the Gibbs energy of formation has been recalculated. A high temperature heat capacity for ZnTe(s) has been selected from the published data. …


Gait Verification Using Knee Acceleration Signals, L. W. Hang, C. Y. Hong, C. W. Yen, D. J. Chang, Mark L. Nagurka Nov 2011

Gait Verification Using Knee Acceleration Signals, L. W. Hang, C. Y. Hong, C. W. Yen, D. J. Chang, Mark L. Nagurka

Mechanical Engineering Faculty Research and Publications

A novel gait recognition method for biometric applications is proposed. The approach has the following distinct features. First, gait patterns are determined via knee acceleration signals, circumventing difficulties associated with conventional vision-based gait recognition methods. Second, an automatic procedure to extract gait features from acceleration signals is developed that employs a multiple-template classification method. Consequently, the proposed approach can adjust the sensitivity and specificity of the gait recognition system with great flexibility. Experimental results from 35 subjects demonstrate the potential of the approach for successful recognition. By setting sensitivity to be 0.95 and 0.90, the resulting specificity ranges from 1 …


Disturbance Attenuation In A Magnetic Levitation System With Acceleration Feedback, Feng Tian, Craig Kevin, Mark L. Nagurka Mar 2011

Disturbance Attenuation In A Magnetic Levitation System With Acceleration Feedback, Feng Tian, Craig Kevin, Mark L. Nagurka

Mechanical Engineering Faculty Research and Publications

The objective of this work is to demonstrate the use of acceleration feedback to improve the performance of a maglev system, especially in disturbance attenuation. In the single degree-of-freedom (DOF) system studied here, acceleration feedback has the effect of virtually increasing inertia, damping and stiffness. It is shown that it can be used to increase disturbance rejection without sacrificing tracking performance. Both analytical and experimental results demonstrate that disturbance rejection can be improved with acceleration feedback.