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Published in last 1 year |  In last 2 years |  In last 3 years |  All Please wait a minute... For Selected: Download Citations EndNote Ris BibTeX Toggle Thumbnails Select Acoustic Radiation Force of Microbubbles Within Microcavities TIAN Zhen, KONG Peng, DENG Ke Journal of Jishou University(Natural Sciences Edition)    2023, 44 (6): 28-31.   DOI: 10.13438/j.cnki.jdzk.2023.06.005 Abstract （98）      PDF（pc） （1829KB）（131）       Knowledge map    Save The trapping mechanism of microbubbles is analyzed based on microbubble acoustic radiation force theory and numerical simulation,and the acoustic radiation force of microbubbles in microcavities is studied.The theoretical analysis showed that when the driving frequency of the sound field is lower than the resonant frequency of the microbubble,the force direction of the microbubble points to the maximum value of the sound field.When the driving frequency of the sound field is higher than the resonant frequency of the microbubble,the force direction of the microbubble points to the minimum value of the sound field.Combined with finite element simulation of the quartz cavity,it is verified that the resonance properties exhibited by microbubbles of different sizes in the same acoustic field are different.Smaller microbubbles move towards the acoustic field minimum under the action of standing waves,while larger microbubbles move in the opposite direction. Reference | Related Articles | Metrics | Comments（0） Select Design of Ultrathin Transmissive Acoustic Cloak SUI Yumei, KONG Peng, DENG Ke, ZHAO Heping Journal of Jishou University(Natural Sciences Edition)    2023, 44 (6): 32-36.   DOI: 10.13438/j.cnki.jdzk.2023.06.006 Abstract （104）      PDF（pc） （2319KB）（139）       Knowledge map    Save Acoustically transmissive cloak is constructed with a combination of two labyrinthine type metasurfaces-phase-modulated metasurface and near-zero refractive index metasurface.The near-zero refractive index metasurface is verified by energy band calculation and equivalent medium theory to have zero refractive index property similar to phonon crystals,so that it can guide the acoustic waves to continue to go around the obstacles in the original direction of the acoustic waves;the phase-modulated metasurface,on the other hand,should have a high transmittance while having the role of phase-modulation to ensure that the acoustic waves can pass through in large quantities.The simulations and calculations show that the acoustic transmission cloak formed by the construction works well. Reference | Related Articles | Metrics | Comments（0） Select Tunable Dual-Frequency Perfect Absorber with Graphene ZHAO Jinyun, SHAN Xinyu, GAO Guangbo, HUANG Yonggang Journal of Jishou University(Natural Sciences Edition)    2023, 44 (6): 37-43.   DOI: 10.13438/j.cnki.jdzk.2023.06.007 Abstract （97）      PDF（pc） （3283KB）（144）       Knowledge map    Save A tunable dual-frequency perfect absorber consisting of a graphene resonator,a SiO2 dielectric layer and a metal reflector layer has been designed by utilizing the excellent tunable optical properties of graphene.The effects of graphene chemical potential,polarization angle and size on the absorber absorption performance were systematically investigated,and the electric field pattern at the resonance frequency was analyzed to further explain the principle of absorber absorption.The results show that the absorber has an absorption rate of 99.98% and 99.99% at 6.363 and 8.987,respectively.The absorption peak position of the absorber can be effectively adjusted by changing the chemical potential of graphene,and the peak absorption rate can reach more than the peak absorption rate at any polarization angle in the range of 0°~80°.The thickness of the SiO2 dielectric layer has almost no effect on the resonance peak position of this absorber,but it has some effect on the peak absorption rate,which increases and then decreases with the gradual increase of the thickness,and perfect absorption is achieved near the thickness of 3.1 μm.The high absorption rate of this absorber stems mainly from the electromagnetic resonance effect. Reference | Related Articles | Metrics | Comments（0）