Search results for " phenomenon"
showing 10 items of 109 documents
New analytical approach to analyze the nonlinear regime of stochastic resonance
2015
We propose some approximate methods to explore the nonlinear regime of the stochastic resonance phenomenon. These approximations correspond to different truncation schemes of cumulants. We compare the theoretical results for the signal power amplification, obtained by using ordinary cumulant truncation schemes, that is Gaussian and excess approximations, the modified two-state approximation with those obtained by numerical simulations of the Langevin equation describing the dynamics of the system.
On the reconstruction of discontinuous functions using multiquadric RBF–WENO local interpolation techniques
2020
Abstract We discuss several approaches involving the reconstruction of discontinuous one-dimensional functions using parameter-dependent multiquadric radial basis function (MQ-RBF) local interpolants combined with weighted essentially non-oscillatory (WENO) techniques, both in the computation of the locally optimized shape parameter and in the combination of RBF interpolants. We examine the accuracy of the proposed reconstruction techniques in smooth regions and their ability to avoid Gibbs phenomena close to discontinuities. In this paper, we propose a true MQ-RBF–WENO method that does not revert to the classical polynomial WENO approximation near discontinuities, as opposed to what was pr…
Monotone cubic spline interpolation for functions with a strong gradient
2021
Abstract Spline interpolation has been used in several applications due to its favorable properties regarding smoothness and accuracy of the interpolant. However, when there exists a discontinuity or a steep gradient in the data, some artifacts can appear due to the Gibbs phenomenon. Also, preservation of data monotonicity is a requirement in some applications, and that property is not automatically verified by the interpolator. Hence, some additional techniques have to be incorporated so as to ensure monotonicity. The final interpolator is not actually a spline as C 2 regularity and monotonicity are not ensured at the same time. In this paper, we study sufficient conditions to obtain monot…
Migrazioni e questioni politiche
2020
Il saggio presenta e discute i risultati di una ricerca transnazionale condotta su 16 paesi europei sulla percezione dell'opinione pubblica del nesso transmigrazioni e criminalità. The essay presents and discusses the results of a transnational research conducted on 16 European countries on the public opinion's perception of the link between migration and crime.
Über den adäquaten Reiz des Bogengangsystems
1953
An analysis is given of the processes in the semicircular canals during adequate stimulation, emphasizing especially the forces acting on the cupula itself. In this way it is possible to understand the physical and physiological phenomena in straight-lined and rotation movements.
Untersuchungen �ber die Einwirkung von verschiedenen Pharmaka auf die Spontanrhythmik des isolierten H�hneramnion
1954
1. Das isolierte Huhneramnion nach Baur eignet sich gut, um Fragen nach der Entstehung der Erregung, deren Weiterleitung und Koordination, dem Angriffspunkt und der Wirkungsweise von Pharmaka zu prufen, da es sich um ein nervenfreies, rhythmische Kontraktionen ausfuhrendes Organ handelt, das praparativ leicht zu handhaben ist. 2. Auf die erregende Wirkung von Acetylcholin, Nicotin und Bariumionen sind d-Tubocurarin, Decamethonium, Atropin, Hexamethonium und Pentamethonium ohne Einflus. 3. Papaverin und Chinin hemmen die genannten erregenden Verbindungen reversibel. 4. Bariumionen fuhren zu Storungen in der Regelmasigkeit der rhythmischen Kontraktionen. Die Deutung dieses Effektes wird in de…
Chapter III Phase transitions at surfaces
1995
Abstract The statistical mechanics of phase transitions is briefly reviewed, with an emphasis on surfaces. Flat surfaces of crystals may act as a substrate for adsorption of two-dimensional (d=2) monolayers and multilayers, offering thus the possibility to study phase transitions in restricted dimensionality. Critical phenomena for special universality classes can thus be investigated which have no counterpart in d=3. Also phase transitions can occur that are in a sense “in between” different dimensionalities (e.g., multilayer adsorption and wetting phenomena are transitions in between two and three dimensions, while adsorption of monolayers on stepped surfaces allows phenomena in between o…
Interpersonal Recognition and Responsiveness to Relevant Differences
2006
Abstract This essay defends a three‐dimensional response‐model theory of recognition of persons, and discusses the related phenomenon of recognition of reasons, values and principles. The theory is three‐dimensional in endorsing recognition of the equality of persons and two kinds of relevant differences: merits and special relationships. It defends a ‘response‐model’ which holds that adequacy of recognition of persons is a matter of adequate responsiveness to situation‐specific reasons and requirements. This three‐dimensional response‐model is compared to Peter Jones’s view, which draws the distinction between status and merit recognition, and mediated and unmediated recognition. The essay…
Quiescent X-ray emission from an evolved brown dwarf ?
2004
I report on the X-ray detection of Gl569Bab. During a 25ksec Chandra observation the binary brown dwarf is for the first time spatially separated in X-rays from the flare star primary Gl569A. Companionship to Gl569A constrains the age of the brown dwarf pair to ~300-800 Myr. The observation presented here is only the second X-ray detection of an evolved brown dwarf. About half of the observing time is dominated by a large flare on Gl569Bab, the remainder is characterized by weak and non-variable emission just above the detection limit. This emission -- if not related to the afterglow of the flare -- represents the first detection of a quiescent corona on a brown dwarf, representing an impor…
The Nature of Soft Excess in ESO 362-G18 Revealed by XMM-Newton and NuSTAR Spectroscopy
2021
We present a detailed spectral analysis of the joint XMM-Newton and NuSTAR observations of the active galactic nuclei (AGN) in the Seyfert 1.5 Galaxy ESO 362-G18. The broadband ($0.3\mbox{--}79$ keV) spectrum shows the presence of a power-law continuum with a soft excess below $2$ keV, iron K$\alpha$ emission ($\sim 6.4$ keV), and a Compton hump (peaking at $\sim 20$ keV). We find that the soft excess can be modeled by two different possible scenarios: a warm ($kT_\mathrm{e}\sim0.2$ keV) and optically thick ($\tau\sim34$) Comptonizing corona; or with relativistically-blurred reflection off a high-density ($\log{[n_\mathrm{e}/\mathrm{cm}^{-3}]}>18.3$) inner disk. These two models cannot be e…