The Experts below are selected from a list of 264 Experts worldwide ranked by ideXlab platform
Edward B. Damm - One of the best experts on this subject based on the ideXlab platform.
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Monitoring austenite decomposition by ultrasonic velocity
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2006Co-Authors: S. E. Kruger, Edward B. DammAbstract:The ultrasonic longitudinal velocity measured by the laser-ultrasonic technique is compared to dilatometry for the monitoring of austenite decomposition of low alloy steels. It is demonstrated that the technique could be an interesting alternative to dilatometry. The temperature dependence of the ultrasonic velocity and the various phases in steels is determined and used to calculate the decomposed austenite by a simple law of mixtures approximation. As a non-destructive and non-contact technique, laser-Ultrasonics can be applied to monitor austenite transformation of real products in an industrial production line, which would be much more difficult with dilatometry.
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Monitoring austenite decomposition by ultrasonic velocity
Materials Science and Engineering: A, 2006Co-Authors: S. E. Kruger, Edward B. DammAbstract:The ultrasonic longitudinal velocity measured by the laser-ultrasonic technique is compared to dilatometry for the monitoring of austenite decomposition of low alloy steels. It is demonstrated that the technique could be an interesting alternative to dilatometry. The temperature dependence of the ultrasonic velocity and the various phases in steels is determined and used to calculate the decomposed austenite by a simple law of mixtures approximation. As a non-destructive and non-contact technique, laser-Ultrasonics can be applied to monitor austenite transformation of real products in an industrial production line, which would be much more difficult with dilatometry.Peer reviewed: YesNRC publication: Ye
Yann Deval - One of the best experts on this subject based on the ideXlab platform.
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Intra-body communications: radio-frequency versus ultrasonic
Analog Integrated Circuits and Signal Processing, 2016Co-Authors: Francois Rivet, Nick Owen, Daniel T. H. Lai, Yann DevalAbstract:Ultrasonics have been used in a number of biomedical and civil application ranging from medical ultrasound devices to beam deformation non-destructive testing. Ultrasonic pressure waves have been used naturally for thousands of years by animals for navigation and communication, with the prime examples being bats with ultrasonic navigation through air and dolphins with ultrasonic communication and navigation in water. This paper investigates on signal propagation within the human being by means of intra-body communications without radio-frequency waves but, instead, with lower (if not deeply lower) frequency waves. An exhaustive review of up-to-date propagation modes in water-like vectors is performed and experimental measurements allow the setting up of a comparison with conventional propagation. A practical demonstrator has been developed to characterize within a low frequency range the ultrasonic wave one-direction propagation in piece of meat.
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Intra-Body Communications - Radio-Frequency versus Ultrasonic
2014Co-Authors: Francois Rivet, Nick Owen, Daniel T. H. Lai, Yann DevalAbstract:Ultrasonics have been used in a number of biomedical and civil application ranging from medical ultrasound devices to beam deformation non-destructive testing. Ultrasonic pressure waves have been used naturally for thousands of years by animals for navigation and communication, with the prime examples being bats with ultrasonic navigation through air and dolphin's with ultrasonic communication and navigation in water. This paper investigates on signal propagation within the Human Being by means of Intra-Body Communications without radiofrequency waves but, instead, with lower (if not deeply lower) frequency waves. An exhaustive review of up-to-date propagation modes in water-like vectors is performed, and experimental measurements allow the setting up of a comparison with conventional propagation. A practical demonstrator has been developed to characterize within a low frequency range the ultrasonic wave propagation in piece of meat.
Franz Grieser - One of the best experts on this subject based on the ideXlab platform.
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the use of ultrasonic cleaning for ultrafiltration membranes in the dairy industry
Separation and Purification Technology, 2004Co-Authors: Shobha Muthukumaran, K Yang, A Seuren, Sandra E Kentish, Muthupandian Ashokkumar, Geoffrey W Stevens, Franz GrieserAbstract:Abstract The ultrafiltration of whey solutions is a common feature of dairy processes. However, the frequent fouling of ultrafiltration membranes and the subsequent cleaning cycle significantly affect the economics of such a process. In this work, we investigated the effect of Ultrasonics on the cleaning of whey-fouled membranes and examined the variables that influence this effect. Experiments were conducted using a small single sheet membrane unit that was immersed totally within an ultrasonic bath. Results show that the use of Ultrasonics enhances the flux recovery following fouling. The extent of flux recovery is independent of the length of sonication time and increases with ultrasonic power. The use of surfactants in combination with ultrasonic irradiation shows a synergistic effect, providing a better efficiency than either cleaning process alone. Repetitive use of ultrasonic cleaning over a 1 month period does not result in any significant change in the permeate flux of a cleaned membrane, indicating that the ultrasonic treatment does not appear to damage the membrane structure itself.
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the use of ultrasonic cleaning for ultrafiltration membranes in the dairy industry
Separation and Purification Technology, 2004Co-Authors: Shobha Muthukumaran, K Yang, A Seuren, Sandra E Kentish, Muthupandian Ashokkumar, Geoffrey W Stevens, Franz GrieserAbstract:Abstract The ultrafiltration of whey solutions is a common feature of dairy processes. However, the frequent fouling of ultrafiltration membranes and the subsequent cleaning cycle significantly affect the economics of such a process. In this work, we investigated the effect of Ultrasonics on the cleaning of whey-fouled membranes and examined the variables that influence this effect. Experiments were conducted using a small single sheet membrane unit that was immersed totally within an ultrasonic bath. Results show that the use of Ultrasonics enhances the flux recovery following fouling. The extent of flux recovery is independent of the length of sonication time and increases with ultrasonic power. The use of surfactants in combination with ultrasonic irradiation shows a synergistic effect, providing a better efficiency than either cleaning process alone. Repetitive use of ultrasonic cleaning over a 1 month period does not result in any significant change in the permeate flux of a cleaned membrane, indicating that the ultrasonic treatment does not appear to damage the membrane structure itself.
Masatsune Yamaguchi - One of the best experts on this subject based on the ideXlab platform.
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High Performance Ultrasonic Transducers Employing ZnO/Pyrex-glass Diaphragm Structure on a Si Substrate
Japanese Journal of Applied Physics, 2014Co-Authors: Y. Yamada, Ken-ya Hashimoto, Velayutham Rajendran, Masatsune YamaguchiAbstract:The paper describes the development of high performance underwater ultrasonic transducers employing ZnO/Pyrex-glass composite diaphragm structure on a Si substrate. It is shown that the transducer successfully radiates and detects Ultrasonics at the fundamental frequency of 155 MHz with a relative -3 dB band width of 11.1% and a minimum transduction loss of 4.3 dB, both of which are in good agreement with theoretical prediction. The possibility of the application of the transducer to sensor devices is described for the measurement of ultrasonic wave velocity in liquid.
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high performance ultrasonic transducers employing zno pyrex glass diaphragm structure on a si substrate
Japanese Journal of Applied Physics, 1991Co-Authors: Y. Yamada, Ken-ya Hashimoto, Velayutham Rajendran, Masatsune YamaguchiAbstract:The paper describes the development of high performance underwater ultrasonic transducers employing ZnO/Pyrex-glass composite diaphragm structure on a Si substrate. It is shown that the transducer successfully radiates and detects Ultrasonics at the fundamental frequency of 155 MHz with a relative -3 dB band width of 11.1% and a minimum transduction loss of 4.3 dB, both of which are in good agreement with theoretical prediction. The possibility of the application of the transducer to sensor devices is described for the measurement of ultrasonic wave velocity in liquid.
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Miniaturised ultrasonic-wave velocity and attenuation sensors for liquid
IEEE 1992 Ultrasonics Symposium Proceedings, 1Co-Authors: Ken-ya Hashimoto, Y. Yamada, T. Ienaka, Masatsune YamaguchiAbstract:The development of miniaturized ultrasonic-wave velocity and attenuation sensors for liquids is described. The sensors employ ZnO-film/Pyrex-glass composite diaphragm transducers. The transducers efficiently launch spurious-free ultrasonic-waves into liquids over a wide bandwidth in VHF/UHF ranges. Emphasis is placed on the development of sensors used for online monitoring of industrial production processes. The sensor is made by uniting the transducer with an ultrasonic-wave reflector, so that any external mechanical shock and vibration are avoided. Three methods for ultrasonic-wave velocity measurement are attempted. Their performance is discussed. The attenuation constant of Ultrasonics in liquids is measured by comparing the amplitudes of multiple-reflected ultrasonic echoes with each other. It is shown that accuracy can be improved by taking the electric characteristics of the transducer into consideration. >
S. E. Kruger - One of the best experts on this subject based on the ideXlab platform.
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Monitoring austenite decomposition by ultrasonic velocity
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2006Co-Authors: S. E. Kruger, Edward B. DammAbstract:The ultrasonic longitudinal velocity measured by the laser-ultrasonic technique is compared to dilatometry for the monitoring of austenite decomposition of low alloy steels. It is demonstrated that the technique could be an interesting alternative to dilatometry. The temperature dependence of the ultrasonic velocity and the various phases in steels is determined and used to calculate the decomposed austenite by a simple law of mixtures approximation. As a non-destructive and non-contact technique, laser-Ultrasonics can be applied to monitor austenite transformation of real products in an industrial production line, which would be much more difficult with dilatometry.
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Monitoring austenite decomposition by ultrasonic velocity
Materials Science and Engineering: A, 2006Co-Authors: S. E. Kruger, Edward B. DammAbstract:The ultrasonic longitudinal velocity measured by the laser-ultrasonic technique is compared to dilatometry for the monitoring of austenite decomposition of low alloy steels. It is demonstrated that the technique could be an interesting alternative to dilatometry. The temperature dependence of the ultrasonic velocity and the various phases in steels is determined and used to calculate the decomposed austenite by a simple law of mixtures approximation. As a non-destructive and non-contact technique, laser-Ultrasonics can be applied to monitor austenite transformation of real products in an industrial production line, which would be much more difficult with dilatometry.Peer reviewed: YesNRC publication: Ye
