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Axial Vibration

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Seckin Filiz – One of the best experts on this subject based on the ideXlab platform.

  • modeling carbon nanotube based mass sensors using Axial Vibration and nonlocal elasticity
    Physica E-low-dimensional Systems & Nanostructures, 2011
    Co-Authors: Metin Aydogdu, Seckin Filiz

    Abstract:

    In the present study, Axial Vibration behavior of single-walled carbon nanotube-based mass sensors is studied using nonlocal elasticity theory. The nonlocal constitutive equations of Eringen are used in the formulations. Carbon nanotubes with different lengths, attached mass and boundary conditions are considered in the formulations. The effects of nonlocality, length of the carbon nanotubes and attached mass are investigated in detail for each considered problem. It is shown that the Axial Vibration behavior of single-walled carbon nanotubes can be used in mass sensors. The dynamic behavior of single-walled carbon nanotubes can be modeled using the nonlocal elasticity models. The mass sensitivity of nanotube-based mass sensors can reach zeptograms.

  • Axial Vibration of carbon nanotube heterojunctions using nonlocal elasticity
    Computational Materials Science, 2010
    Co-Authors: Seckin Filiz, Metin Aydogdu

    Abstract:

    Abstract In the present study, Axial Vibration of carbon nanotube heterojunctions is studied using nonlocal rod theory. The nonlocal constitutive equations of Eringen are used in the formulations. The carbon nanotubes with different lengths, chirality and diameters are considered in the heterojunctions. Effect of nonlocality, length of the carbon nanotubes and lengths of each segment are investigated in detail for each considered problem. It is obtained that, by joining carbon nanotubes good Vibrational properties are obtained by suitable selection of parameters.

Xuefei Zhou – One of the best experts on this subject based on the ideXlab platform.

  • microalgae harvesting by an Axial Vibration membrane the mechanism of mitigating membrane fouling
    Journal of Membrane Science, 2016
    Co-Authors: Fangchao Zhao, Huaqiang Chu, Xiaobo Tan, Yalei Zhang, Libin Yang, Xuefei Zhou

    Abstract:

    Abstract Membrane fouling by algae and extracellular organic matter (EOM) is a major problem in algae harvesting. In this study, the Axial Vibration ultrafiltration-membrane (AVM) is able to limit membrane fouling during filtration effectively. A membrane can achieve high critical flux at a high shear rate. During filtration, AVM is capable of operating with less fouling at a constant flux. The result from “extended Derjaguin, Landau, Verwey, Overbeek” (XDLVO) calculation indicates that with the increase of shear rate, it is more difficult for algae to foul the membrane. At a frequency of 5 Hz, the average inertial lift force is 0.024 nN, and the interaction force becomes a long-range attractive force that draws algae to the membrane; there are still certain smaller algae, algae debris and EOM that deposit on the membrane; leading to many algae depositing on the membrane. At a frequency of 10 Hz, the average inertial lift force is 0.12 nN, and there is a long-range repulsive region preventing algae from depositing on the membrane; however, the result shows that the mechanism of fouling mitigation by Vibration is preventing algae from approaching the membrane, which reduces the deposition of algae on the membrane.

  • comparison of Axial Vibration membrane and submerged aeration membrane in microalgae harvesting
    Bioresource Technology, 2016
    Co-Authors: Fangchao Zhao, Huaqiang Chu, Xiaobo Tan, Yalei Zhang, Libin Yang, Xuefei Zhou, Jianfu Zhao

    Abstract:

    Abstract The submerged aeration membrane (SAM) system and Axial Vibration membrane (AVM) system can mitigate membrane fouling. In this study, both systems were investigated to compare the performance of filtration and the membrane fouling in algae filtration. In 5-h filtration, the transmembrane pressure (TMP) of SAM reached to 70.0 kPa, while there was almost no increase in TMP for AVM. After continuous filtration, it could be found that there was hardly any algae cells on the membrane of AVM (0.11 g/m 2 ), which was about 32.4 times less than that of SAM (3.56 g/m 2 ). Compared with the SAM system, AVM had a lesser membrane fouling, regardless of the reversible fouling or irreversible fouling. By SEM, FTIR and EEM, it could be found there was less irreversible extracellular organic matter (EOM) on the membrane of AVM. By MW distribution, it could be observed that less EOM with high-MW adhered to membrane of AVM.

Jimin Hu – One of the best experts on this subject based on the ideXlab platform.

  • nonlinear acoustic power measurement based on fundamental focal Axial Vibration velocity for high intensity focused ultrasound
    Journal of Applied Physics, 2018
    Co-Authors: Yuzhi Li, Dong Zhang, Jimin Hu

    Abstract:

    The acoustic power (AP) of high-intensity focused ultrasound (HIFU) shows great potential for ensuring the efficacy and safety of tumor treatment. By considering the energy of the harmonics, an easily applicable nonlinear AP measurement method for HIFU based on the fundamental focal Axial Vibration velocity (F-FAVV) is proposed. The focal pressures of the harmonics with respect to the surface Vibration velocity are simulated, and a piecewise function of the required harmonic order is developed based on the 40-dB attenuation criterion of the harmonic-to-fundamental ratio. With the relationships between the power gain and the FAVVs of the harmonics, the dependence of AP on the F-FAVV is achieved by summing the harmonic powers. The APs of HIFU under various surface Vibration velocities are verified by experimental measurements of the F-FAVV using a laser vibrometer and the corresponding integration results over the transducer surface. Good agreement between the numerical and experimental results demonstrates the feasibility of accurate AP measurement for HIFU using the F-FAVV and suggests the potential for applications in biomedical engineering.The acoustic power (AP) of high-intensity focused ultrasound (HIFU) shows great potential for ensuring the efficacy and safety of tumor treatment. By considering the energy of the harmonics, an easily applicable nonlinear AP measurement method for HIFU based on the fundamental focal Axial Vibration velocity (F-FAVV) is proposed. The focal pressures of the harmonics with respect to the surface Vibration velocity are simulated, and a piecewise function of the required harmonic order is developed based on the 40-dB attenuation criterion of the harmonic-to-fundamental ratio. With the relationships between the power gain and the FAVVs of the harmonics, the dependence of AP on the F-FAVV is achieved by summing the harmonic powers. The APs of HIFU under various surface Vibration velocities are verified by experimental measurements of the F-FAVV using a laser vibrometer and the corresponding integration results over the transducer surface. Good agreement between the numerical and experimental results demonstrates…

  • accurate acoustic power measurement for low intensity focused ultrasound using focal Axial Vibration velocity
    Journal of Applied Physics, 2017
    Co-Authors: Juan Tu, Dong Zhang, Jimin Hu

    Abstract:

    Low-intensity focused ultrasound is a form of therapy that can have reversible acoustothermal effects on biological tissue, depending on the exposure parameters. The acoustic power (AP) should be chosen with caution for the sake of safety. To recover the energy of counteracted radial Vibrations at the focal point, an accurate AP measurement method using the focal Axial Vibration velocity (FAVV) is proposed in explicit formulae and is demonstrated experimentally using a laser vibrometer. The experimental APs for two transducers agree well with theoretical calculations and numerical simulations, showing that AP is proportional to the square of the FAVV, with a fixed power gain determined by the physical parameters of the transducers. The favorable results suggest that the FAVV can be used as a valuable parameter for non-contact AP measurement, providing a new strategy for accurate power control for low-intensity focused ultrasound in biomedical engineering.