Zobrazeno 1 - 10
of 127
pro vyhledávání: '"Jacek Jarzynski"'
Autor:
Jacek Jarzynski, Sheldon M. Jeter
Publikováno v:
2000 Annual Conference Proceedings.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::54ab9f9d4ff71641614d5143bf53fb60
https://doi.org/10.18260/1-2--8298
https://doi.org/10.18260/1-2--8298
Publikováno v:
Mechanics Research Communications. 34:289-294
The objective of this study is to quantify the dissipation losses in cement paste using diffuse ultrasound, and then to relate these results to the corresponding values measured with a coherent ultrasound procedure. The results show a linear dependen
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6b85091414a311ea2e87e71ab6cd0277
https://doi.org/10.1016/j.mechrescom.2006.10.003
https://doi.org/10.1016/j.mechrescom.2006.10.003
Autor:
Wonsiri Punurai, Jianmin Qu, Jin-Yeon Kim, Laurence J. Jacobs, Jacek Jarzynski, Kimberly E. Kurtis
Publikováno v:
Cement and Concrete Research. 37:38-46
The effectiveness of advanced ultrasonic techniques to quantitatively characterize the capillary porosity and entrained air content in hardened cement paste is examined. Direct measurements of ultrasonic attenuation are used to measure the volume fra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a812f964664af502776d317f50407c18
https://doi.org/10.1016/j.cemconres.2006.09.016
https://doi.org/10.1016/j.cemconres.2006.09.016
Publikováno v:
NDT & E International. 39:514-524
This research develops a technique that uses the attenuation of ultrasonic waves to characterize the average size and volume fraction of entrained air voids in hardened cement paste. Quantitative knowledge of entrained air void size and distribution
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5b6533850234fd134302db3df193e2b7
https://doi.org/10.1016/j.ndteint.2006.02.001
https://doi.org/10.1016/j.ndteint.2006.02.001
Publikováno v:
NDT & E International. 38:634-642
Air-coupled ultrasonic sources are relatively inefficient because the high impedance mismatch at the air/solid boundary means that most of the input energy (in air) is reflected at this boundary. The objective of this research is to increase efficien
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1a8705381d7201c4813b3de09f14384d
https://doi.org/10.1016/j.ndteint.2005.03.002
https://doi.org/10.1016/j.ndteint.2005.03.002
Publikováno v:
The Journal of the Acoustical Society of America. 118:1406-1413
A small, high performance fiber optic microphone has been designed, fabricated, and tested. The device builds on a previous design utilizing a thin, seven-fiber optical probe, but now adds a micromachined 1.5μm thick silicon diaphragm active element
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bd990957492a16e908f71cd34dd9bea1
https://doi.org/10.1121/1.2000749
https://doi.org/10.1121/1.2000749
Publikováno v:
NDT & E International. 36:523-533
This study develops an in situ methodology that uses ultrasonic waves to measure the material properties of a layer. These material properties include the longitudinal and shear wave speeds, as well as the thickness of the layer. The unknown properti
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fadab8da0c209e5568f18c90e2c8947b
https://doi.org/10.1016/s0963-8695(03)00049-5
https://doi.org/10.1016/s0963-8695(03)00049-5
Publikováno v:
Sealing Technology. 2002:6-11
This feature provides details of a monitoring system for liquid-lubricated seals. The system avoids the drawbacks that are associated with techniques based on acoustic emission, and other monitoring systems that rely on the use of sound-intensity and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6a221a0ca0637251e5fbe6f411eca5ad
https://doi.org/10.1016/s1350-4789(02)80027-7
https://doi.org/10.1016/s1350-4789(02)80027-7
Publikováno v:
The Journal of the Acoustical Society of America. 110:2980-2990
A new technique to experimentally determine the electrostrictive coefficients of thin polymer films is presented. This technique is a second-order extension of the first-order quasistatic method for the measurement of piezoelectric coefficients previ
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::42001c43a62abff33b59552bce35fe43
https://doi.org/10.1121/1.1416905
https://doi.org/10.1121/1.1416905
Publikováno v:
Tribology International. 34:461-468
The general form of the pressure (Proc. Am. Acad. Arts Sci. 77 (1949) 117) and temperature (Physical properties of molecular crystals, liquids and glasses (1968) 350) dependence of viscosity has been known for at least 50 years. Viscosity varies with
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e22b9a8af2087be28e8924c7244a1b08
https://doi.org/10.1016/s0301-679x(01)00042-1
https://doi.org/10.1016/s0301-679x(01)00042-1