Results 61 to 70 of about 252,123 (184)
Reducing microwave loss in superconducting resonators due to trapped vortices [PDF]
, 2009 Microwave resonators with high quality factors have enabled many recent breakthroughs with superconducting qubits and photon detectors, typically operated in shielded environments to reduce the ambient magnetic field.
B. L. T. Plourde +4 more
core +3 more sources
Tailored acoustic metamaterials. Part II. Extremely thick-walled Helmholtz resonator arrays
Proceedings of the Royal Society A, 2022 We present a solution method which combines the technique of matched asymptotic expansions with the method of multipole expansions to determine the band structure of cylindrical Helmholtz resonator arrays in two dimensions.
Michael J. A. Smith, I. Abrahams
semanticscholar +1 more source
Enhancement of Low-Frequency Noise for Muffler by Optimizing the Space between Three 1-Degrees of Freedom Helmholtz Resonator [PDF]
MATEC Web of ConferencesThe Helmholtz resonator is one of the basic elements to attenuate low-frequency noise and increase sound transmission loss in a muffler for particular low frequency zone.
Jatola Ravi, Gupta Amit Kumar
doaj +1 more source
Helmholtz Resonance in Korean Bells
International Scholastic Journal of Science, 2017 Traditional Korean bells are installed above a shallow well with a gap between the bell and the ground, effectively creating a Helmholtz resonator. During installation, the size of the well and the gap is traditionally adjusted, through trial and error ...
Junghyun Kim
doaj
International Journal of Environmental Health Engineering, 2015 Aims: The main goal of this paper was to evaluate the effectiveness of Helmholtz resonator in noise reduction of duct equipped with active noise control (ANC). Materials and Methods: Noise frequency band was produced by a propeller fan, which was spread
Farhad Forouharmajd +3 more
doaj +1 more source
Journal of Low Frequency Noise Vibration and Active Control, 2021 The low-frequency harmonic components of urban substation noise are easy to annoy the residents. Multi-frequency perfect sound-absorbing metasurface based on the Helmholtz resonator (HR) is an alternative solution to suppress the low-frequency harmonic ...
Sun Wei +4 more
semanticscholar +1 more source
AIP AdvancesAn acoustic frequency-selective Y-shaped waveguide splitter based on in-line Helmholtz resonators is demonstrated analytically via a modified transfer matrix method, computationally through finite element simulations using COMSOL, and experimentally by ...
William M. Robertson +2 more
doaj +1 more source
Extraordinary acoustic transmission mediated by Helmholtz resonators
AIP Advances, 2014 We demonstrate perfect transmission of sound through a rigid barrier embedded with Helmholtz resonators. The resonators are confined within a waveguide and they are oriented such that one neck protrudes onto each side of the barrier.
Vijay Koju +2 more
doaj +1 more source
Air transparent soundproof window
, 2013 A soundproof window or wall which is transparent to airflow is presented. The design is based on two wave theories of diffraction and acoustic metamaterials.
Kim, Sang-Hoon, Lee, Seong-Hyun
core +2 more sources
Extraordinary focusing of sound above a soda can array without time reversal [PDF]
, 2015 Recently, Lemoult et al. [Phys. Rev. Lett. 107, 064301 (2011)] used time reversal to focus sound above an array of soda cans into a spot much smaller than the acoustic wavelength in air.
Fang, Nicholas +6 more
core +3 more sources