Results 81 to 90 of about 252,123 (184)

Resonance and Neck Length for a Spherical Resonator

International Scholastic Journal of Science, 2011
The relationship between the neck length of a spherical resonator and its period of fundamental resonance was investigated. This was done by measuring the frequency of fundamental resonance of the resonator at 6 different neck lengths.
Emily Corning
doaj  

Separating hyperfine from spin-orbit interactions in organic semiconductors by multi-octave magnetic resonance using coplanar waveguide microresonators

, 2016
Separating the influence of hyperfine from spin-orbit interactions in spin-dependent carrier recombination and dissociation processes necessitates magnetic resonance spectroscopy over a wide range of frequencies.
Ambal, Kapildeb, Boehme, Christoph, Jamali, Shirin, Joshi, Gajadhar, Kavand, Marzieh, Lupton, John M., Malissa, Hans, Miller, Richards, Ogden, Lillie, Schurig, David, Venkatesh, Suresh   +10 more
core   +1 more source

Lorenz-Mie theory for 2D scattering and resonance calculations

, 2015
This PhD tutorial is concerned with a description of the two-dimensional generalized Lorenz-Mie theory (2D-GLMT), a well-established numerical method used to compute the interaction of light with arrays of cylindrical scatterers.
Dubé, Louis J., Gagnon, Denis
core   +1 more source

Metasurfaces with Embedded Rough Necks for Underwater Low-Frequency Sound Absorption

Applied Sciences
Marine noise pollution is a significant threat to global marine ecosystems and human activities. Most underwater sound-absorbing materials operate in the mid-to high-frequency bands (typically 1–10 kHz for mid-frequency and above 10 kHz for high ...
Dan Xu, Yazhou Zhu, Sha Wang, Zhenming Bao, Ningyu Li   +4 more
doaj   +1 more source

Platonic crystal with low-frequency locally resonant snail structures. Wave trapping, transmission amplification and shielding

, 2018
We propose a new type of platonic crystal. The proposed microstructured plate includes snail resonators with low-frequency resonant vibrations. The particular dynamic effect of the resonators are highlighted by a comparative analysis of dispersion ...
Brun, M., Carta, G., Morvaridi, M.
core   +1 more source

Signatures of Dynamical Tunneling in the Wave function of a Soft-Walled Open Microwave Billiard

, 2004
Evidence for dynamical tunneling is observed in studies of the transmission, and wave functions, of a soft-walled microwave cavity resonator. In contrast to previous work, we identify the conditions for dynamical tunneling by monitoring the evolution of ...
Ferry D K, Frischat S D, H-J Stöckmann, Heller E J, J P Bird, Kim Y H, Lauber H M, Stöckmann H J, Tomsovic S, U Kuhl, Y-H Kim   +10 more
core   +1 more source

Noise attenuation capacity of a Helmholtz resonator

Advances in Engineering Software, 2018
The noise attenuation capacity of a HR defined as the integral of transmission loss in the frequency domain is first derived.The theoretical formula of noise attenuation capacity shows that it is only determined by the geometries of the neck and the cross-sectional area of the duct.The theoretical formula is validated by FEM simulation using COMSOL ...
Chenzhi Cai, Cheuk Ming Mak
openaire   +2 more sources

Control of Combustion-Instabilities Through Various Passive Devices [PDF]

Results of a computational study on the effectiveness of various passive devices for the control of combustion instabilities are presented. An axi-symmetric combustion chamber is considered.
Canabal, Francisco, Frendi, Abdelkader, Nesman, Tom   +2 more
core   +1 more source

Surface Air Movement: An Important Contributor to Ventilation of Isolated Subsurface Structures?

Infrastructures, 2019
This study reports on near-surface airspeed measured using a fast-responding thermoanemometer during an investigation of ventilation of an isolated subsurface structure induced by natural forces. Air speed changes continuously, rapidly, and unpredictably
Thomas Neil McManus, Assed Haddad
doaj   +1 more source

Embedded Rough-Neck Helmholtz Resonator Low-Frequency Acoustic Attenuator

Crystals
In various practical noise control scenarios, such as duct noise mitigation, industrial machinery, architectural acoustics, and underwater applications, it is essential to develop noise absorbers that deliver effective low-frequency attenuation while ...
Xianming Sun, Tao Yu, Lipeng Wang, Yunshu Lu, Changzheng Chen   +4 more
doaj   +1 more source