low-frequency acoustic propagation
Modelling of low frequency muffler based on acoustic black hole effect
... An acoustic filter is a device that comprises of a set of acoustic elements between the source and the ...with acoustic waves being convected downstream by the medium in motion and can be termed as ...
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The Effects of Surface Gravity Waves on High-Frequency Acoustic Propagation in Shallow Water
... McDaniel and McCammon [5] combined both methods to model scattering from a multiscale rough sea surface. They used the root-mean-square (rms) surface heights and slopes predicted by an empirical surface wave model as ...
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A low-cost acoustic permeameter
... this low-frequency approximation ...the propagation constant for a given tortuosity and flow resistivity and ...the propagation constant determined by these two methods was ...both low ...
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Research on the Propagation of Extremely Low Frequency Electromagnetic Wave in Shallow Sea Area
... Extremely low frequency (ELF) electromagnetic (EM) wave radiation and propagation underwater has attracted great attention for a long time [1], such as underwater target detection [2, 3], submarine ...
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SPEED DEPENDENCE OF ACOUSTIC VIBRATION PROPAGATION FROM THE FERRITIC GRAIN SIZE IN LOW-CARBON STEEL
... of low-carbon alloy steel on the speed propagation of acoustic ...speed propagation of acoustic vibrations was measured using a special device such as an ISP-12 with a working ...
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Acoustic wave propagation in rivers: an experimental study
... passive acoustic monitoring (PAM) in rivers, a surrogate method for bedload ...bedload acoustic signals depend on bedload characteristics ...the acoustic waves are ...of propagation effects in ...
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Atmospheric controls on elephant communication
... is frequency-dependent: surfaces are more reflective of lower frequencies, and low-frequency sound produces ground and surface waves which penetrate the shadow ...sufficiently low impedance to ...
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Low frequency sound propagation in activated carbon
... The largest distribution of pores is micropores, which have widths between 0.5 and 1 nm, with 0.7 nm being the most common. This is equal to twice the separation between the graphene layers forming the structure of the ...
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Study of Propagation of Ion Acoustic Waves in Argon Plasma
... of low frequency waves by elec- trodes outside the plasma is extremely inefficient be- cause currents on the plasma periphery shield the plasma interior from the applied ...
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Phonon spectroscopy with chirped shear and compressive acoustic pulses
... the frequency doubled (wavelength ∼400 nm) optical pulses were also carried ...the low-symmetry plane of GaAs, the strain pulse injected from the polycrystalline Al transducer into the sample possesses both ...
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Parametric Sub-Bottom Profiler For AUVs
... of acoustic wave travel in water (sound speed varies as a function of pressure) to mix higher frequency primary acou- stic signals (generally two frequen- cies) to achieve sum and difference ...
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Sound absorption coefficient of coal bottom ash concrete for railway application
... high frequency impedance tube ...between low and high noise ...sound frequency being absorbed by the concrete samples as being shown in figure ...
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Effect Of Defect Orientation In Pipe On Acoustic Wave Propagation
... 4.27 Waveform enhance at 80 kHz after L (0, 1) mode cancellation 54 4.28 Waveform enhance at 90 after L (0, 1) mode cancellation 55 4.29 Waveform enhance at 100 kHz after L (0, 1) mode cancellation 55 4.30 Waveform ...
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Simulation of the acoustic wave propagation using a meshless method
... Abstract. This paper presents numerical simulations of the acoustic wave propagation phenomenon modelled via Linearized Euler equations. A meshless method based on collocation of the strong form of the ...
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Rigorous characterization of acoustic-optical interactions in silicon slot waveguides by full-vectorial finite element method
... a low-index region due to the continuity of the normal component of the Electric Flux Density (D) at the dielectric interfaces, which opens up new opportunities for sensor design [5, 6] where the slots can be ...
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WaterCom A Multilevel, Multipurpose Underwater Communications Test Platform
... the propagation delay between the source and ...the propagation delay between the source and the destination of the overheard frame can be performed during the clock synchronization process by examining the ...
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The thermophysical properties of gases determined using an annular acoustic resonator
... lated from acoustic measurements of modes of different symmetry in a cylindrical resonator. In this work, only the low frequency azimuthal modes were measured, hence modes[r] ...
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Terahertz Plasmonic Switch Based on Periodic Array of Graphene/Silicon
... Recent studies have been focused on integrated plas- monic devices for their applications in optical circuits in order to be used in telecommunication and data transmission, causing the development of plasmonic devices ...
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Computational Modeling of Nanocrystal Superlattices
... the low frequency region of the dispersion curve, where the three acoustic modes (in red) are shown with several low frequency optical ...allowable frequency observed in bulk ...
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Phonon transport simulations in low dimensional disordered graphene nanoribbons
... IV. T HE I NFLUENCE OF L INE -E DGE R OUGHNESS Next, we then investigate phonon transport in these low- dimensional GNRs in the presence of disorder. At such small ribbon widths with rough edges, the edge-phonon ...
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