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According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
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The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
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If a driven oscillator needs to resonate at a specific frequency, then very light damping is required. An example of light damping includes playing piano strings and many other musical instruments. Conversely, to achieve small-amplitude oscillations as in a car's suspension system, heavy damping is required. Heavy damping reduces the amplitude, but the tradeoff is that the system responds at more frequencies. Speed bumps and gravel roads prove that even a car's suspension system is not...
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Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:
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Recent Progress in Resonant Acoustic Metasurfaces.

Dongan Liu1, Limei Hao1, Weiren Zhu2

  • 1College of Science, Xi'an University of Science and Technology, Xi'an 710054, China.

Materials (Basel, Switzerland)
|November 14, 2023
PubMed
Summary

Acoustic metasurfaces offer advanced sound control with thin designs. This review covers resonant metasurface designs, applications, and future trends in acoustic wave manipulation.

Keywords:
absorptiveacoustic metasurfacesacoustic wavereflectiontransmissiontunabilitywavefront manipulation

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Area of Science:

  • Acoustics
  • Materials Science
  • Metamaterials

Background:

  • Acoustic metasurfaces are 2D acoustic metamaterials enabling sub-wavelength wave manipulation.
  • They offer promising applications in noise reduction, cloaking, imaging, and focusing.
  • Resonant structural units are key to achieving large wavelength control in small-sized metasurfaces.

Purpose of the Study:

  • To review recent research progress in resonant acoustic metasurfaces.
  • To cover design mechanisms, structural unit advances, and classification of resonant metasurfaces.
  • To discuss applications and tunable metasurfaces, predicting future research interests.

Main Methods:

  • Review of recent scientific literature on resonant acoustic metasurfaces.
  • Analysis of design principles and structural unit advancements.
  • Compilation of classifications, applications, and tunable metasurface strategies.

Main Results:

  • Acoustic metasurfaces utilize resonant structural units for effective acoustic wave control.
  • Diverse applications include noise reduction, cloaking, acoustic imaging, and focusing.
  • Advances in design mechanisms and tunable properties are expanding their capabilities.

Conclusions:

  • Resonant acoustic metasurfaces are a significant area of research for advanced acoustic applications.
  • Continued development in design and tunability will drive future innovations.
  • The field shows strong potential for further exploration and practical implementation.