J
Jacek Jarzynski
Researcher at Georgia Institute of Technology
Publications - 39
Citations - 1040
Jacek Jarzynski is an academic researcher from Georgia Institute of Technology. The author has contributed to research in topics: Laser & Ultrasonic sensor. The author has an hindex of 17, co-authored 39 publications receiving 992 citations.
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Journal ArticleDOI
Time-frequency representations of Lamb waves.
TL;DR: The utility of using TFRs to quantitatively resolve changes in the frequency content of these nonstationary signals, as a function of time, is illustrated.
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Time-frequency representation of Lamb waves using the reassigned spectrogram
TL;DR: This study demonstrates that the reassigned spectrogram is capable of distinguishing multiple, closely spaced Lamb modes in the ultrasonic frequency range.
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Characterization of entrained air voids in cement paste with scattered ultrasound
TL;DR: In this article, the average size and volume fraction of entrained air voids in hardened cement paste was determined using a combination of an ultrasonic scattering model and an inversion algorithm.
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The temperature, pressure and time dependence of lubricant viscosity
TL;DR: In this paper, it was shown that for the timescale of viscous response, a significant time dependence of viscosity is unlikely for the viscous regime of EHL traction.
Journal ArticleDOI
Characterization of Multi-scale Porosity in Cement Paste by Advanced Ultrasonic Techniques
Wonsiri Punurai,Wonsiri Punurai,Jacek Jarzynski,Jianmin Qu,Jin-Yeon Kim,Laurence J. Jacobs,Kimberly E. Kurtis +6 more
TL;DR: In this paper, the effectiveness of advanced ultrasonic techniques to quantitatively characterize the capillary porosity and entrained air content in hardened cement paste is examined, and an inversion procedure based on a theoretical attenuation model is used to predict the average size and volume fraction of air voids in each specimen, producing results in good agreement with results obtained by standard petrographic methods and by gravimetric analysis.