The Experts below are selected from a list of 267 Experts worldwide ranked by ideXlab platform
Shinichi Takeuchi - One of the best experts on this subject based on the ideXlab platform.
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frequency characteristics of receiving sensitivity and waveform of an anti acoustic cavitation hydrophone
Japanese Journal of Applied Physics, 2014Co-Authors: Michihisa Shiiba, Takeyoshi Uchida, Tsuneo Kikuchi, Nagaya Okada, Minoru Kurosawa, Shinichi TakeuchiAbstract:Novel anti-cavitation hydrophones were fabricated by depositing a hydrothermally synthesized lead zirconate titanate Polycrystalline Film on the back of a titanium plate. These hydrophones were not damaged by the measurement of the acoustic field formed by a high-intensity focused ultrasound (HIFU) device. The hydrophones were designed using Mason's equivalent circuit and by numerical simulation to improve their receiving characteristics for the measurement of the HIFU device. High receiving sensitivity with flat frequency characteristics was obtained by using a backing material with a specific acoustic impedance of about 20 × 106 kg/(m2 s) [Rayl]. We developed a new type of hydrophone using a tin and titanium rods as backing materials, which have specific acoustic impedances of 24 × 106 and 27 × 106 kg/(m2 s), respectively. The fabricated anti-cavitation hydrophone showed wide frequency characteristics of the receiving sensitivity. Furthermore, we observed the output waveform with distortion due to nonlinear propagation using the fabricated anti-cavitation hydrophone. This hydrophone was not damaged by exposure to a high-intensity acoustic field of an ultrasound cleaner under acoustic cavitation for duration of about ten times longer than the conventional commercial hydrophone.
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cavitation sensor with hydrothermally synthesized lead zirconate titanate Polycrystalline Film deposited on cylindrical titanium pipe estimation of acoustic cavitation field and basic characteristics of cavitation sensor
INTERNATIONAL CONGRESS ON ULTRASONICS: Gdańsk 2011, 2012Co-Authors: Michihisa Shiiba, Takeyoshi Uchida, Tsuneo Kikuchi, Norimichi Kawashima, Minoru Kurosawa, Mutzuo Ishikawa, Shinichi TakeuchiAbstract:We have developed a small cavitation sensor by deposition of hydrothermally synthesized lead zirconate titanate Polycrystalline Film onto the outer surface of a hollow cylindrical titanium pipe. The spatial distribution of acoustic cavitation generated in the vessel of a 150 kHz sonoreactor was measured by using the broadband integrated voltage (BIV) calculated from the output signal of the cavitation sensor. A spatial distribution similar to the sonochemical luminescence pattern could be observed in the measured BIV results. We found that our fabricated cavitation sensor could measure the spatial distribution of acoustic cavitation in a high-intensity ultrasound field for a period exceeding 150 h without damage. We also measured the spatial distribution and directivity of the receiving sensitivity for characterization of the sensor. The measured results suggest that the BIV and cavitation signal included in the output signal of the cavitation sensor are a consequence of the acoustic cavitation generated ...
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estimation of cavitation sensor with hydrothermally synthesized lead zirconate titanate Film on titanium cylindrical pipe spatial distribution of acoustic cavitation field and basic characteristics of cavitation sensor
Japanese Journal of Applied Physics, 2011Co-Authors: Michihisa Shiiba, Takeyoshi Uchida, Tsuneo Kikuchi, Norimichi Kawashima, Minoru Kurosawa, Shinichi TakeuchiAbstract:We developed a small cavitation sensor by the deposition of a hydrothermally synthesized lead zirconate titanate (PZT) Polycrystalline Film on a Ti hollow cylindrical pipe. The spatial distributions of acoustic cavitation generated in a vessel of 150 kHz sonoreactor were measured by using our cavitation sensor. We estimated the spatial distribution of acoustic cavitation by using the broad band integrated voltage (BIV) calculated from the output signal of our cavitation sensor. A similar spatial distribution of the BIV to a sonochemical luminescence pattern could be observed in the measured results. Our fabricated cavitation sensor could be applied to the measurement of sound pressure in a high-intensity ultrasound field with acoustic cavitation for a period longer than 150 without damage. We measured the spatial distribution and directivity of the receiving sensitivity for the characterization of our cavitation sensor. It is suggested from the measured results that the BIV and the cavitation signal included in the output signal from the cavitation sensor are based on the acoustic cavitation generated in the cylindrical hollow of our cavitation sensor.
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development of miniature needle type hydrophone with lead zirconate titanate Polycrystalline Film deposited by hydrothermal method
Japanese Journal of Applied Physics, 2006Co-Authors: Hiroshi Kitsunai, Mutsuo Ishikawa, Shinichi Takeuchi, Norimichi Kawashima, Minoru Kurosawa, Etsuzo OdairaAbstract:A needle-type miniature hydrophone was developed using hydrothermally deposited lead zirconate titanate (PZT) Polycrystalline Films on a titanium (Ti) wire with a diameter of 0.3 mm in this study. Two types of hydrophones were fabricated as a trial for this paper. One is a hydrophone with hydrothermally deposited PZT Polycrystalline Films on the end surface and side surface near the end of the Ti wire. The other one is a hydrophone with hydrothermally deposited PZT Polycrystalline Films only on the end surface of the Ti wire. We measured the frequency characteristics of the relative receiving sensitivity and directivity of the fabricated hydrophones. The frequency characteristics of the relative receiving sensitivities of the fabricated hydrophone type A or B were measured in the frequency range from 1 to 20 MHz. Our hydrophone with deposited PZT Films on the end and side faces of the Ti wire had problems in the directivity of relative receiving sensitivity. The relative sensitivity of the side direction was higher than that of the front direction. The directivity of our hydrophone with hydrothermally deposited PZT Films only on the end surface of the Ti wire was improved remarkably.
Eugen Rabkin - One of the best experts on this subject based on the ideXlab platform.
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formation of hollow gold silver nanoparticles through the surface diffusion induced bulk intermixing
Acta Materialia, 2016Co-Authors: Nimrod Gazit, L Klinger, Gunther Richter, Eugen RabkinAbstract:Abstract Hollow nanoparticles with size-controlled internal cavities can be synthesized through a novel mechanism of surface diffusion induced bulk intermixing in a thin Polycrystalline Film between the particles. Starting with single crystalline silver nanoparticles on sapphire substrate produced by solid state dewetting technique, we show that subsequent deposition of the thin gold layer, followed by annealing at a low homological temperature leads to the outdiffusion of silver into the Film and formation of hollow nanoparticles with a single internal cavity. We built a kinetic model of hollowing which identified the surface diffusion induced bulk intermixing as a dominating atomistic mechanism, and provided an excellent fit to experimental data without any adjustable parameters. This process allows sculpturing of internal porosity of the nanoparticles and provides a general route to the synthesis of ordered arrays of hollow nanostructures attached to the substrate.
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the role of grain boundary sliding in solid state dewetting of thin Polycrystalline Films
Scripta Materialia, 2014Co-Authors: Anna Kosinova, L Klinger, Oleg Kovalenko, Eugen RabkinAbstract:We present experimental evidence that grain boundary sliding contributes to the mass transport associated with solid-state dewetting of a thin Polycrystalline Film of gold on sapphire. A model describing the retraction kinetics of the edge of Polycrystalline thin Film controlled by combined surface/interface diffusion and grain boundary sliding is proposed. The model predicts stepped Film morphology in the vicinity of expanding hole, in good agreement with the experimental data.
Michihisa Shiiba - One of the best experts on this subject based on the ideXlab platform.
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frequency characteristics of receiving sensitivity and waveform of an anti acoustic cavitation hydrophone
Japanese Journal of Applied Physics, 2014Co-Authors: Michihisa Shiiba, Takeyoshi Uchida, Tsuneo Kikuchi, Nagaya Okada, Minoru Kurosawa, Shinichi TakeuchiAbstract:Novel anti-cavitation hydrophones were fabricated by depositing a hydrothermally synthesized lead zirconate titanate Polycrystalline Film on the back of a titanium plate. These hydrophones were not damaged by the measurement of the acoustic field formed by a high-intensity focused ultrasound (HIFU) device. The hydrophones were designed using Mason's equivalent circuit and by numerical simulation to improve their receiving characteristics for the measurement of the HIFU device. High receiving sensitivity with flat frequency characteristics was obtained by using a backing material with a specific acoustic impedance of about 20 × 106 kg/(m2 s) [Rayl]. We developed a new type of hydrophone using a tin and titanium rods as backing materials, which have specific acoustic impedances of 24 × 106 and 27 × 106 kg/(m2 s), respectively. The fabricated anti-cavitation hydrophone showed wide frequency characteristics of the receiving sensitivity. Furthermore, we observed the output waveform with distortion due to nonlinear propagation using the fabricated anti-cavitation hydrophone. This hydrophone was not damaged by exposure to a high-intensity acoustic field of an ultrasound cleaner under acoustic cavitation for duration of about ten times longer than the conventional commercial hydrophone.
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cavitation sensor with hydrothermally synthesized lead zirconate titanate Polycrystalline Film deposited on cylindrical titanium pipe estimation of acoustic cavitation field and basic characteristics of cavitation sensor
INTERNATIONAL CONGRESS ON ULTRASONICS: Gdańsk 2011, 2012Co-Authors: Michihisa Shiiba, Takeyoshi Uchida, Tsuneo Kikuchi, Norimichi Kawashima, Minoru Kurosawa, Mutzuo Ishikawa, Shinichi TakeuchiAbstract:We have developed a small cavitation sensor by deposition of hydrothermally synthesized lead zirconate titanate Polycrystalline Film onto the outer surface of a hollow cylindrical titanium pipe. The spatial distribution of acoustic cavitation generated in the vessel of a 150 kHz sonoreactor was measured by using the broadband integrated voltage (BIV) calculated from the output signal of the cavitation sensor. A spatial distribution similar to the sonochemical luminescence pattern could be observed in the measured BIV results. We found that our fabricated cavitation sensor could measure the spatial distribution of acoustic cavitation in a high-intensity ultrasound field for a period exceeding 150 h without damage. We also measured the spatial distribution and directivity of the receiving sensitivity for characterization of the sensor. The measured results suggest that the BIV and cavitation signal included in the output signal of the cavitation sensor are a consequence of the acoustic cavitation generated ...
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estimation of cavitation sensor with hydrothermally synthesized lead zirconate titanate Film on titanium cylindrical pipe spatial distribution of acoustic cavitation field and basic characteristics of cavitation sensor
Japanese Journal of Applied Physics, 2011Co-Authors: Michihisa Shiiba, Takeyoshi Uchida, Tsuneo Kikuchi, Norimichi Kawashima, Minoru Kurosawa, Shinichi TakeuchiAbstract:We developed a small cavitation sensor by the deposition of a hydrothermally synthesized lead zirconate titanate (PZT) Polycrystalline Film on a Ti hollow cylindrical pipe. The spatial distributions of acoustic cavitation generated in a vessel of 150 kHz sonoreactor were measured by using our cavitation sensor. We estimated the spatial distribution of acoustic cavitation by using the broad band integrated voltage (BIV) calculated from the output signal of our cavitation sensor. A similar spatial distribution of the BIV to a sonochemical luminescence pattern could be observed in the measured results. Our fabricated cavitation sensor could be applied to the measurement of sound pressure in a high-intensity ultrasound field with acoustic cavitation for a period longer than 150 without damage. We measured the spatial distribution and directivity of the receiving sensitivity for the characterization of our cavitation sensor. It is suggested from the measured results that the BIV and the cavitation signal included in the output signal from the cavitation sensor are based on the acoustic cavitation generated in the cylindrical hollow of our cavitation sensor.
Sukriti Manna - One of the best experts on this subject based on the ideXlab platform.
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grain boundary driven plateau rayleigh instability in multilayer nanocrystalline thin Film a phase field study
Materials & Design, 2017Co-Authors: Tamoghna Chakrabarti, Nisha Verma, Sukriti MannaAbstract:Thermal stability of nanocrystalline multilayer thin Film is of paramount importance as the applications often involve high temperature. Here we report on-the layer instability phenomenon in binary Polycrystalline thin Film initiating from the grain boundary migrations at higher temperatures using phase-field simulations. Effect of layer thickness, bilayer spacing and the absence of grain boundary are also investigated along with the grain boundary mobility of individual phases on the layer stability. Layer instability in the Polycrystalline Film is shown to arise from the grain boundary grooving which originates spontaneously from the presence of grain boundaries. Our results show that the growth of the perturbation generated from the differential curvature follows Plateau-Rayleigh instability criterion. Increase in layer thickness, lower bilayer thickness as well as lower grain boundary mobility improve layer stability. Phase-field simulations show similar microstructural evolution as has been observed in our zirconium (Zr)/zirconium nitride (ZrN) system experimentally. Detail analysis performed in this work to understand the mechanisms of layer instability leads us to predict measures which will improve the thermal stability of multilayer nanocrystalline thin Film. (C) 2017 Elsevier Ltd. All rights reserved.
Minoru Kurosawa - One of the best experts on this subject based on the ideXlab platform.
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frequency characteristics of receiving sensitivity and waveform of an anti acoustic cavitation hydrophone
Japanese Journal of Applied Physics, 2014Co-Authors: Michihisa Shiiba, Takeyoshi Uchida, Tsuneo Kikuchi, Nagaya Okada, Minoru Kurosawa, Shinichi TakeuchiAbstract:Novel anti-cavitation hydrophones were fabricated by depositing a hydrothermally synthesized lead zirconate titanate Polycrystalline Film on the back of a titanium plate. These hydrophones were not damaged by the measurement of the acoustic field formed by a high-intensity focused ultrasound (HIFU) device. The hydrophones were designed using Mason's equivalent circuit and by numerical simulation to improve their receiving characteristics for the measurement of the HIFU device. High receiving sensitivity with flat frequency characteristics was obtained by using a backing material with a specific acoustic impedance of about 20 × 106 kg/(m2 s) [Rayl]. We developed a new type of hydrophone using a tin and titanium rods as backing materials, which have specific acoustic impedances of 24 × 106 and 27 × 106 kg/(m2 s), respectively. The fabricated anti-cavitation hydrophone showed wide frequency characteristics of the receiving sensitivity. Furthermore, we observed the output waveform with distortion due to nonlinear propagation using the fabricated anti-cavitation hydrophone. This hydrophone was not damaged by exposure to a high-intensity acoustic field of an ultrasound cleaner under acoustic cavitation for duration of about ten times longer than the conventional commercial hydrophone.
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cavitation sensor with hydrothermally synthesized lead zirconate titanate Polycrystalline Film deposited on cylindrical titanium pipe estimation of acoustic cavitation field and basic characteristics of cavitation sensor
INTERNATIONAL CONGRESS ON ULTRASONICS: Gdańsk 2011, 2012Co-Authors: Michihisa Shiiba, Takeyoshi Uchida, Tsuneo Kikuchi, Norimichi Kawashima, Minoru Kurosawa, Mutzuo Ishikawa, Shinichi TakeuchiAbstract:We have developed a small cavitation sensor by deposition of hydrothermally synthesized lead zirconate titanate Polycrystalline Film onto the outer surface of a hollow cylindrical titanium pipe. The spatial distribution of acoustic cavitation generated in the vessel of a 150 kHz sonoreactor was measured by using the broadband integrated voltage (BIV) calculated from the output signal of the cavitation sensor. A spatial distribution similar to the sonochemical luminescence pattern could be observed in the measured BIV results. We found that our fabricated cavitation sensor could measure the spatial distribution of acoustic cavitation in a high-intensity ultrasound field for a period exceeding 150 h without damage. We also measured the spatial distribution and directivity of the receiving sensitivity for characterization of the sensor. The measured results suggest that the BIV and cavitation signal included in the output signal of the cavitation sensor are a consequence of the acoustic cavitation generated ...
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estimation of cavitation sensor with hydrothermally synthesized lead zirconate titanate Film on titanium cylindrical pipe spatial distribution of acoustic cavitation field and basic characteristics of cavitation sensor
Japanese Journal of Applied Physics, 2011Co-Authors: Michihisa Shiiba, Takeyoshi Uchida, Tsuneo Kikuchi, Norimichi Kawashima, Minoru Kurosawa, Shinichi TakeuchiAbstract:We developed a small cavitation sensor by the deposition of a hydrothermally synthesized lead zirconate titanate (PZT) Polycrystalline Film on a Ti hollow cylindrical pipe. The spatial distributions of acoustic cavitation generated in a vessel of 150 kHz sonoreactor were measured by using our cavitation sensor. We estimated the spatial distribution of acoustic cavitation by using the broad band integrated voltage (BIV) calculated from the output signal of our cavitation sensor. A similar spatial distribution of the BIV to a sonochemical luminescence pattern could be observed in the measured results. Our fabricated cavitation sensor could be applied to the measurement of sound pressure in a high-intensity ultrasound field with acoustic cavitation for a period longer than 150 without damage. We measured the spatial distribution and directivity of the receiving sensitivity for the characterization of our cavitation sensor. It is suggested from the measured results that the BIV and the cavitation signal included in the output signal from the cavitation sensor are based on the acoustic cavitation generated in the cylindrical hollow of our cavitation sensor.
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development of miniature needle type hydrophone with lead zirconate titanate Polycrystalline Film deposited by hydrothermal method
Japanese Journal of Applied Physics, 2006Co-Authors: Hiroshi Kitsunai, Mutsuo Ishikawa, Shinichi Takeuchi, Norimichi Kawashima, Minoru Kurosawa, Etsuzo OdairaAbstract:A needle-type miniature hydrophone was developed using hydrothermally deposited lead zirconate titanate (PZT) Polycrystalline Films on a titanium (Ti) wire with a diameter of 0.3 mm in this study. Two types of hydrophones were fabricated as a trial for this paper. One is a hydrophone with hydrothermally deposited PZT Polycrystalline Films on the end surface and side surface near the end of the Ti wire. The other one is a hydrophone with hydrothermally deposited PZT Polycrystalline Films only on the end surface of the Ti wire. We measured the frequency characteristics of the relative receiving sensitivity and directivity of the fabricated hydrophones. The frequency characteristics of the relative receiving sensitivities of the fabricated hydrophone type A or B were measured in the frequency range from 1 to 20 MHz. Our hydrophone with deposited PZT Films on the end and side faces of the Ti wire had problems in the directivity of relative receiving sensitivity. The relative sensitivity of the side direction was higher than that of the front direction. The directivity of our hydrophone with hydrothermally deposited PZT Films only on the end surface of the Ti wire was improved remarkably.