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Helmholtz Resonator

Aeroacoustic source characterization technique applied to a cylindrical Helmholtz resonator

Aeroacoustic source characterization technique applied to a cylindrical Helmholtz resonator

... a Helmholtz resonator excited by a boundary ...allow Helmholtz resonance as well as longitudinal and azimuthal acoustic modes within the cavity to be excited by varying the wind tunnel flow ...

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Attenuation Performance of a Semi Active Helmholtz Resonator in a Grazing Flow Duct

Attenuation Performance of a Semi Active Helmholtz Resonator in a Grazing Flow Duct

... The resonator yields high transmission loss performance at its resonance ...of Helmholtz resonator is very narrow and limited and HRs are often designed accord- ing to the exciting frequency of ...

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Diode laser photoacoustic spectroscopy of CO2, H2S and O2 in a differential Helmholtz resonator for trace gas analysis in the biosciences and petrochemistry

Diode laser photoacoustic spectroscopy of CO2, H2S and O2 in a differential Helmholtz resonator for trace gas analysis in the biosciences and petrochemistry

... symmetrical resonator composed of two identical chambers produces pho- toacoustic absorption signals which are out-of-phase in the two chambers, whereas noise including flow noise is in phase in the two ...

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Cavity-enhanced raman and helmholtz resonator photoacoustic spectroscopy to monitor the mixed sugar metabolism of E. coli

Cavity-enhanced raman and helmholtz resonator photoacoustic spectroscopy to monitor the mixed sugar metabolism of E. coli

... Measuring the headspace above bacterial suspensions by spectroscopy to characterize bacterial growth and metabolism has many advantages compared to more conventional techniques. It is nonintrusive, it does not require ...

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Chamber music: an unusual Helmholtz resonator for song amplification in a Neotropical bush cricket (Orthoptera, Tettigoniidae)

Chamber music: an unusual Helmholtz resonator for song amplification in a Neotropical bush cricket (Orthoptera, Tettigoniidae)

... a Helmholtz resonator as the ...with Helmholtz resonance, and FEM substantiated this by showing that the closed model does indeed produce frequency responses like an harmonic oscillator with a ...

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Behaviour of acoustic waves in a duct with Helmholtz resonator in presence of a temperature gradient

Behaviour of acoustic waves in a duct with Helmholtz resonator in presence of a temperature gradient

... with Helmholtz resonator in presence of a temperature ...a Helmholtz resonator in the presence of a mean temperature gradient without mean air ...

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Wide Stopband Microstrip Triplexer Using Common Crossed Resonator and Uniform Impedance Resonator

Wide Stopband Microstrip Triplexer Using Common Crossed Resonator and Uniform Impedance Resonator

... In [8], a novel cross-shaped resonator was presented and proved to be able to resonant at three controllable frequencies. Based on this work, a triplexer based on a common crossed resonator is designed and ...

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Boundary value problems for modified Helmholtz equations and applications

Boundary value problems for modified Helmholtz equations and applications

... the Helmholtz and the modified Helmholtz equations formulated in the interior of a convex polygon are ...ified Helmholtz equations in Clifford ...

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Helmholtz bright and black soliton splitting at nonlinear interfaces

Helmholtz bright and black soliton splitting at nonlinear interfaces

... The inherent nonparaxial character of solitons evolving at planar interfaces is captured in a unified, and generalized, Snell’s law [20] which addresses the evolution of bright [21] and dark solitons [22,23] impinging on ...

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Evolution of Kelvin Helmholtz activity on the dusk
flank magnetopause

Evolution of Kelvin Helmholtz activity on the dusk flank magnetopause

... Magnetosheath Magnetic Field Clock Angle Adjacent to the Magnetopause [12] A good knowledge of solar wind conditions, which are contemporaneous with observations at the flank is essentia[r] ...

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Exact analytical helmholtz bright and dark solitons

Exact analytical helmholtz bright and dark solitons

... The interactions of optical spatial solitons in various types of media have been exten- sively studied both theoretically and experimentally. Three fundamental interaction geome- tries can be identified: almost exactly ...

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Study of Hemi-Spherical Dielectric Resonator Antenna with Change in Dielectric Characteristics of Resonator

Study of Hemi-Spherical Dielectric Resonator Antenna with Change in Dielectric Characteristics of Resonator

... i. As the relative permittivity and permeability of the matter constituting the resonator increases, there decrease in the uniformity of the far field radiation pattern. The far field radiation pattern is ...

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CONSTRUCTION OF GREEN FUNCTION FOR BESSEL-HELMHOLTZ EQUATION

CONSTRUCTION OF GREEN FUNCTION FOR BESSEL-HELMHOLTZ EQUATION

... For distinguishing physically interesting solutions of boundary value prob- lems for elliptic equations in infinite domains with a spectral parameter when this parameter is a point of th[r] ...

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Helmholtz solitons in power law optical materials

Helmholtz solitons in power law optical materials

... In Helmholtz soliton theory [15], the governing equation is of the nonlinear Helmholtz (NLH) type. The spatial coordinates appear on an equal footing and diffraction is fully two-dimensional, occurring in ...

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The parallelization of helmholtz equation related to breast cancer growth

The parallelization of helmholtz equation related to breast cancer growth

... Other alternative mathematical models to predict the breast cancer detection are using thermal simulation(Gonzalez, 2007), transport and diffusion model by (Hinow and Gerlee, 2009) and Helmholtz equation ...

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Optimized Schwarz methods for heterogeneous Helmholtz and Maxwell's equations

Optimized Schwarz methods for heterogeneous Helmholtz and Maxwell's equations

... the Helmholtz equation (3). We thus focus in the remainder on the Helmholtz case, but keep in mind that all results we will obtain hold mutatis mutandis also for the Maxwell ...

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Transverse wave induced Kelvin Helmholtz rolls in spicules

Transverse wave induced Kelvin Helmholtz rolls in spicules

... In addition to their jet-like dynamic behaviour, spicules usually exhibit strong transverse speeds, multi-stranded structure and heating from chromospheric to transition region temperatures. In this work we first analyse ...

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On Kelvin–Helmholtz and parametric instabilities driven by coronal waves

On Kelvin–Helmholtz and parametric instabilities driven by coronal waves

... A key component of the model of Antolin et al. (2015) is that the surface of an oscillating flux tube can become unstable to the Kelvin–Helmholtz (KH) instability (first seen associated with trans- verse kink ...

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Helmholtz cage design and validation for nanosatellites HWIL testing

Helmholtz cage design and validation for nanosatellites HWIL testing

... To test the uniformity of the Helmholtz cage, the procedure described in [14] was used. In this procedure, a wooden plate graduated in centimeters is placed along the axis, aided by strings tied to the cage. Then, ...

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Comparison of two wave element methods for the Helmholtz problem

Comparison of two wave element methods for the Helmholtz problem

... Helmholtz problems poses a serious challenge to standard, low-order finite el- ement techniques. Due to the requirement of dense spatial discretization, the modeling of wave fields at high wave numbers is ...

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