The Experts below are selected from a list of 33387 Experts worldwide ranked by ideXlab platform
Arik Yochelis - One of the best experts on this subject based on the ideXlab platform.
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spatial heterogeneity may form an inverse camel shaped arnol d tongue in parametrically forced oscillations
Chaos, 2020Co-Authors: Yuval Edri, Ehud Meron, Arik YochelisAbstract:Frequency locking in forced oscillatory systems typically organizes in “V”-shaped domains in the plane spanned by the Forcing Frequency and amplitude, the so-called Arnol’d tongues. Here, we show that if the medium is spatially extended and monotonically heterogeneous, e.g., through spatially dependent natural Frequency, the resonance tongues can also display “U” and “W” shapes; we refer to the latter as an “inverse camel” shape. We study the generic forced complex Ginzburg–Landau equation for damped oscillations under parametric Forcing and, using linear stability analysis and numerical simulations, uncover the mechanisms that lead to these distinct resonance shapes. Additionally, we study the effects of discretization by exploring Frequency locking of oscillator chains. Since we study a normal-form equation, the results are model-independent near the onset of oscillations and, therefore, applicable to inherently heterogeneous systems in general, such as the cochlea. The results are also applicable to controlling technological performances in various contexts, such as arrays of mechanical resonators, catalytic surface reactions, and nonlinear optics.Frequency locking in forced oscillatory systems typically organizes in “V”-shaped domains in the plane spanned by the Forcing Frequency and amplitude, the so-called Arnol’d tongues. Here, we show that if the medium is spatially extended and monotonically heterogeneous, e.g., through spatially dependent natural Frequency, the resonance tongues can also display “U” and “W” shapes; we refer to the latter as an “inverse camel” shape. We study the generic forced complex Ginzburg–Landau equation for damped oscillations under parametric Forcing and, using linear stability analysis and numerical simulations, uncover the mechanisms that lead to these distinct resonance shapes. Additionally, we study the effects of discretization by exploring Frequency locking of oscillator chains. Since we study a normal-form equation, the results are model-independent near the onset of oscillations and, therefore, applicable to inherently heterogeneous systems in general, such as the cochlea. The results are also applicable to c...
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spatial heterogeneity may form an inverse camel shape arnol d tongue in parametrically forced oscillations
arXiv: Pattern Formation and Solitons, 2019Co-Authors: Yuval Edri, Ehud Meron, Arik YochelisAbstract:Frequency locking in forced oscillatory systems typically occurs in 'V'-shaped domains in the plane spanned by the Forcing Frequency and amplitude, the so-called Arnol'd tongues. Here, we show that if the medium is spatially extended and monotonically heterogeneous, e.g., through spatially-dependent natural Frequency, the resonance tongues can also display 'U' and 'W' shapes; to the latter, we refer as "inverse camel" shape. We study the generic forced complex Ginzburg-Landau equation for damped oscillations under parametric Forcing and, using linear stability analysis and numerical simulations, uncover the mechanisms that lead to these distinct shapes. Additionally, we study the effects of discretization, by exploring Frequency locking of oscillators chains. Since we study a normal-form equation, the results are model-independent near the onset of oscillations, and, therefore, applicable to inherently heterogeneous systems in general, such as the cochlea. The results are also applicable to controlling technological performances in various contexts, such as arrays of mechanical resonators, catalytic surface reactions, and nonlinear optics.
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Molding the asymmetry of localized Frequency-locking waves by a generalized Forcing and implications to the inner ear.
Physical Review E, 2018Co-Authors: Yuval Edri, Dolores Bozovic, Ehud Meron, Arik YochelisAbstract:Frequency locking to an external Forcing Frequency is a well-known phenomenon. In the auditory system, it results in a localized traveling wave, the shape of which is essential for efficient discrimination between incoming frequencies. An amplitude equation approach is used to show that the shape of the localized traveling wave depends crucially on the relative strength of additive versus parametric Forcing components; the stronger the parametric Forcing, the more asymmetric is the response profile and the sharper is the traveling-wave front. The analysis qualitatively captures the empirically observed regions of linear and nonlinear responses and highlights the potential significance of parametric Forcing mechanisms in shaping the resonant response in the inner ear.
Yuval Edri - One of the best experts on this subject based on the ideXlab platform.
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spatial heterogeneity may form an inverse camel shaped arnol d tongue in parametrically forced oscillations
Chaos, 2020Co-Authors: Yuval Edri, Ehud Meron, Arik YochelisAbstract:Frequency locking in forced oscillatory systems typically organizes in “V”-shaped domains in the plane spanned by the Forcing Frequency and amplitude, the so-called Arnol’d tongues. Here, we show that if the medium is spatially extended and monotonically heterogeneous, e.g., through spatially dependent natural Frequency, the resonance tongues can also display “U” and “W” shapes; we refer to the latter as an “inverse camel” shape. We study the generic forced complex Ginzburg–Landau equation for damped oscillations under parametric Forcing and, using linear stability analysis and numerical simulations, uncover the mechanisms that lead to these distinct resonance shapes. Additionally, we study the effects of discretization by exploring Frequency locking of oscillator chains. Since we study a normal-form equation, the results are model-independent near the onset of oscillations and, therefore, applicable to inherently heterogeneous systems in general, such as the cochlea. The results are also applicable to controlling technological performances in various contexts, such as arrays of mechanical resonators, catalytic surface reactions, and nonlinear optics.Frequency locking in forced oscillatory systems typically organizes in “V”-shaped domains in the plane spanned by the Forcing Frequency and amplitude, the so-called Arnol’d tongues. Here, we show that if the medium is spatially extended and monotonically heterogeneous, e.g., through spatially dependent natural Frequency, the resonance tongues can also display “U” and “W” shapes; we refer to the latter as an “inverse camel” shape. We study the generic forced complex Ginzburg–Landau equation for damped oscillations under parametric Forcing and, using linear stability analysis and numerical simulations, uncover the mechanisms that lead to these distinct resonance shapes. Additionally, we study the effects of discretization by exploring Frequency locking of oscillator chains. Since we study a normal-form equation, the results are model-independent near the onset of oscillations and, therefore, applicable to inherently heterogeneous systems in general, such as the cochlea. The results are also applicable to c...
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spatial heterogeneity may form an inverse camel shape arnol d tongue in parametrically forced oscillations
arXiv: Pattern Formation and Solitons, 2019Co-Authors: Yuval Edri, Ehud Meron, Arik YochelisAbstract:Frequency locking in forced oscillatory systems typically occurs in 'V'-shaped domains in the plane spanned by the Forcing Frequency and amplitude, the so-called Arnol'd tongues. Here, we show that if the medium is spatially extended and monotonically heterogeneous, e.g., through spatially-dependent natural Frequency, the resonance tongues can also display 'U' and 'W' shapes; to the latter, we refer as "inverse camel" shape. We study the generic forced complex Ginzburg-Landau equation for damped oscillations under parametric Forcing and, using linear stability analysis and numerical simulations, uncover the mechanisms that lead to these distinct shapes. Additionally, we study the effects of discretization, by exploring Frequency locking of oscillators chains. Since we study a normal-form equation, the results are model-independent near the onset of oscillations, and, therefore, applicable to inherently heterogeneous systems in general, such as the cochlea. The results are also applicable to controlling technological performances in various contexts, such as arrays of mechanical resonators, catalytic surface reactions, and nonlinear optics.
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Molding the asymmetry of localized Frequency-locking waves by a generalized Forcing and implications to the inner ear.
Physical Review E, 2018Co-Authors: Yuval Edri, Dolores Bozovic, Ehud Meron, Arik YochelisAbstract:Frequency locking to an external Forcing Frequency is a well-known phenomenon. In the auditory system, it results in a localized traveling wave, the shape of which is essential for efficient discrimination between incoming frequencies. An amplitude equation approach is used to show that the shape of the localized traveling wave depends crucially on the relative strength of additive versus parametric Forcing components; the stronger the parametric Forcing, the more asymmetric is the response profile and the sharper is the traveling-wave front. The analysis qualitatively captures the empirically observed regions of linear and nonlinear responses and highlights the potential significance of parametric Forcing mechanisms in shaping the resonant response in the inner ear.
Alexander Knohl - One of the best experts on this subject based on the ideXlab platform.
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reconciling canopy interception parameterization and rainfall Forcing Frequency in the community land model for simulating evapotranspiration of rainforests and oil palm plantations in indonesia
Journal of Advances in Modeling Earth Systems, 2019Co-Authors: Ana Meijide, David M Lawrence, Olivier Roupsard, Kimberly M Carlson, Hsinyi Chen, Alexander Roll, Alexander KnohlAbstract:By mediating evapotranspiration processes, plant canopies play an important role in the terrestrial water cycle and regional climate. Substantial uncertainties exist in modeling canopy water interception and related hydrological processes due to rainfall Forcing Frequency selection and varying canopy traits. Here we design a new time interpolation method “zero” to better represent convective‐type precipitation in tropical regions. We also implement and recalibrate plant functional type‐specific interception parameters for rainforests and oil palm plantations, where oil palms express higher water interception capacity than forests, using the Community Land Model (CLM) versions 4.5 and 5.0 with CLM‐Palm embedded. Reconciling the interception scheme with realistic precipitation Forcing produces more accurate canopy evaporation and transpiration for both plant functional types, which in turn improves simulated evapotranspiration and energy partitioning when benchmarked against observations from our study sites in Indonesia and an extensive literature review. Regional simulations for Sumatra and Kalimantan show that industrial oil palm plantations have 18–27% higher transpiration and 15–20% higher evapotranspiration than forests on an annual regional average basis across different ages or successional stages, even though the forests experience higher average precipitation according to reanalysis data. Our land‐only modeling results indicate that current oil palm plantations in Sumatra and Kalimantan use 15–20% more water (mean 220 mm or 20 Gt) per year compared to lowland rainforests of the same extent. The extra water use by oil palm reduces soil moisture and runoff that could affect ecosystem services such as productivity of staple crops and availability of drinking water in rural areas.
Alejandro O Leon - One of the best experts on this subject based on the ideXlab platform.
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transition from nonradiative to radiative oscillons in parametrically driven systems
Physical Review E, 2020Co-Authors: A J Alvarezsocorro, Marcel G Clerc, Ernesto Berrioscaro, Alejandro O LeonAbstract:Nonequilibrium systems exhibit particle-type solutions. Oscillons are one of the best-known localized states of systems with time-dependent Forcing or parametrically driven systems. We investigate the transition from nonradiative to radiative oscillons in the parametrically driven sine-Gordon model in two spatial dimensions. The bifurcation takes place when the strength of the Forcing (Frequency) increases (decreases) above a certain threshold. As a result of this transition, the oscillon emits radially symmetric evanescent waves. Numerically, we provide the phase diagram and show the supercritical nature of this transition. For small oscillations, based on the amplitude equation approach, the sine-Gordon equation with time-dependent Forcing is transformed into the parametrically driven damped nonlinear Schrodinger model in two spatial dimensions. This amplitude equation exhibits a transition between nonradiative to radiative localized structures, consistently. Both models show quite good agreement.
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alternating spin polarized current induces parametric resonance in spin valves
Physical Review B, 2015Co-Authors: Marcel G Clerc, Alejandro O Leon, Saliya Coulibaly, D Laroze, Alvaro S NunezAbstract:Ferromagnetic systems under the influence of spin-polarized currents exhibit rich spatiotemporal dynamics at nanoscales. We study spin-transfer nano-oscillators driven by the combination of alternating and direct spin-polarized electric currents. We show here that the alternating current induces parametric instabilities on spin valves, that is, the magnetization responses at half the Forcing Frequency. A spatial self-organization emerges as a result of the oscillatory current, which includes dissipative solitons and Faraday-type waves. The parametric regime is described analytically by means of the Landau-Lifshitz-Gilbert-Slonczewski equation, in good agreement with micromagnetic simulations including the full dipolar field.
Ehud Meron - One of the best experts on this subject based on the ideXlab platform.
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spatial heterogeneity may form an inverse camel shaped arnol d tongue in parametrically forced oscillations
Chaos, 2020Co-Authors: Yuval Edri, Ehud Meron, Arik YochelisAbstract:Frequency locking in forced oscillatory systems typically organizes in “V”-shaped domains in the plane spanned by the Forcing Frequency and amplitude, the so-called Arnol’d tongues. Here, we show that if the medium is spatially extended and monotonically heterogeneous, e.g., through spatially dependent natural Frequency, the resonance tongues can also display “U” and “W” shapes; we refer to the latter as an “inverse camel” shape. We study the generic forced complex Ginzburg–Landau equation for damped oscillations under parametric Forcing and, using linear stability analysis and numerical simulations, uncover the mechanisms that lead to these distinct resonance shapes. Additionally, we study the effects of discretization by exploring Frequency locking of oscillator chains. Since we study a normal-form equation, the results are model-independent near the onset of oscillations and, therefore, applicable to inherently heterogeneous systems in general, such as the cochlea. The results are also applicable to controlling technological performances in various contexts, such as arrays of mechanical resonators, catalytic surface reactions, and nonlinear optics.Frequency locking in forced oscillatory systems typically organizes in “V”-shaped domains in the plane spanned by the Forcing Frequency and amplitude, the so-called Arnol’d tongues. Here, we show that if the medium is spatially extended and monotonically heterogeneous, e.g., through spatially dependent natural Frequency, the resonance tongues can also display “U” and “W” shapes; we refer to the latter as an “inverse camel” shape. We study the generic forced complex Ginzburg–Landau equation for damped oscillations under parametric Forcing and, using linear stability analysis and numerical simulations, uncover the mechanisms that lead to these distinct resonance shapes. Additionally, we study the effects of discretization by exploring Frequency locking of oscillator chains. Since we study a normal-form equation, the results are model-independent near the onset of oscillations and, therefore, applicable to inherently heterogeneous systems in general, such as the cochlea. The results are also applicable to c...
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spatial heterogeneity may form an inverse camel shape arnol d tongue in parametrically forced oscillations
arXiv: Pattern Formation and Solitons, 2019Co-Authors: Yuval Edri, Ehud Meron, Arik YochelisAbstract:Frequency locking in forced oscillatory systems typically occurs in 'V'-shaped domains in the plane spanned by the Forcing Frequency and amplitude, the so-called Arnol'd tongues. Here, we show that if the medium is spatially extended and monotonically heterogeneous, e.g., through spatially-dependent natural Frequency, the resonance tongues can also display 'U' and 'W' shapes; to the latter, we refer as "inverse camel" shape. We study the generic forced complex Ginzburg-Landau equation for damped oscillations under parametric Forcing and, using linear stability analysis and numerical simulations, uncover the mechanisms that lead to these distinct shapes. Additionally, we study the effects of discretization, by exploring Frequency locking of oscillators chains. Since we study a normal-form equation, the results are model-independent near the onset of oscillations, and, therefore, applicable to inherently heterogeneous systems in general, such as the cochlea. The results are also applicable to controlling technological performances in various contexts, such as arrays of mechanical resonators, catalytic surface reactions, and nonlinear optics.
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Molding the asymmetry of localized Frequency-locking waves by a generalized Forcing and implications to the inner ear.
Physical Review E, 2018Co-Authors: Yuval Edri, Dolores Bozovic, Ehud Meron, Arik YochelisAbstract:Frequency locking to an external Forcing Frequency is a well-known phenomenon. In the auditory system, it results in a localized traveling wave, the shape of which is essential for efficient discrimination between incoming frequencies. An amplitude equation approach is used to show that the shape of the localized traveling wave depends crucially on the relative strength of additive versus parametric Forcing components; the stronger the parametric Forcing, the more asymmetric is the response profile and the sharper is the traveling-wave front. The analysis qualitatively captures the empirically observed regions of linear and nonlinear responses and highlights the potential significance of parametric Forcing mechanisms in shaping the resonant response in the inner ear.