Results 61 to 70 of about 22,939,027 (338)

On the relevance of Reynolds stresses in resolvent analyses of turbulent wall-bounded flows

, 2019
The ability of linear stochastic response analysis to estimate coherent motions is investigated in turbulent channel flow at friction Reynolds number Re$_\tau$ = 1007.
Cossu, Carlo, Henningson, Dan S., Morra, Pierluigi, Semeraro, Onofrio   +3 more
core   +1 more source

A Study on Controllability of a Class of Impulsive Fractional Nonlinear Evolution Equations with Delay in Banach Spaces

Fractal and Fractional, 2021
Under a new generalized definition of exact controllability we introduced and with a appropriately constructed time delay term in a special complete space to overcome the delay-induced-difficulty, we establish the sufficient conditions of the exact ...
Daliang Zhao
doaj   +1 more source

Temporally Resolved Fluctuation Analysis of Sleep ECG [PDF]

Journal of Biological Physics, 2007
The correlation behavior in the heart beat rate significantly differs with respect to light sleep, deep sleep, and REM sleep. We investigate whether fluctuations of the heart beat rhythm may serve as a surrogate parameter for rapidly changing sleep phenomena, and if these changes are accessible by progressive beat-by-beat analysis of the sleep ...
Stefan, Telser, Martin, Staudacher, Bernhard, Hennig, Yvonne, Ploner, Anton, Amann, Hartmann, Hinterhuber, Monika, Ritsch-Marte   +6 more
openaire   +2 more sources

Analysis of behavioral flow resolves latent phenotypes

Nature Methods, 2023
Abstract Preclinical biomedical research depends on accurately detecting and quantifying rodent behavior. Current data-driven approaches, which segment free exploratory behavior into clusters, suffer from low statistical power due to multiple-testing, exhibit poor transferability across experiments, and fail to exploit the rich behavioral ...
Lukas M. von Ziegler, Fabienne K. Roessler, Oliver Sturman, Rebecca Waag, Mattia Privitera, Sian N. Duss, Eoin C. O’Connor, Johannes Bohacek   +7 more
openaire   +4 more sources

A data–driven sensibility tool for flow control based on resolvent analysis

Results in Engineering
This study presents a novel application of data-driven resolvent analysis algorithm for flow control. The objective is to identify key coherent structures connected to regions of the flow that are highly sensitive to structural changes.
E. Lazpita, J. Garicano-Mena, G. Paniagua, S. Le Clainche, E. Valero   +4 more
doaj   +1 more source

Exponential behavior of neutral impulsive stochastic integro-differential equations driven by Poisson jumps and Rosenblatt process

Nonautonomous Dynamical Systems, 2020
In this article, we are concerned with the neutral impulsive stochastic integro-differential equations driven by Poisson jumps and Rosenblatt process.
Kasinathan Ravikumar, Kasinathan Ramkumar, Hamit Mahamat Hassan Mahamat, Diop Mamadou Abdoul   +3 more
doaj   +1 more source

Scattering properties of Sturm-Liouville equations with sign-alternating weight and transmission condition at turning point

Open Mathematics, 2023
In this article, we focus on the scattering analysis of Sturm-Liouville type singular operator including an impulsive condition and turning point. In the classical literature, there are plenty of papers considering the positive values of the weight ...
Çoşkun Nimet, Görgülü Merve
doaj   +1 more source

On the Spectrum of the Non-Selfadjoint Differential Operator with an Integral Boundary Condition and Negative Weight Function

Universal Journal of Mathematics and Applications, 2023
In this paper, we shall study the spectral properties of the non-selfadjoint operator in the space $L_{\varrho }^{2}\left(\mathbb{R}_{+}\right) $ generated by the Sturm-Liouville differential equation \begin{equation*} -y^{^{\prime \prime }}+q\left( x ...
Nimet Coskun, Merve Görgülü
doaj   +1 more source

Spectral Gaps for Periodic Elliptic Operators with High Contrast: an Overview [PDF]

, 2002
We discuss the band-gap structure and the integrated density of states for periodic elliptic operators in the Hilbert space $L_2(\R^m)$, for $m \ge 2$.
Hempel, Rainer, Post, Olaf
core   +2 more sources

Norm-resolvent convergence of one-dimensional high-contrast periodic problems to a Kronig-Penney dipole-type model

, 2015
We prove operator-norm resolvent convergence estimates for one-dimensional periodic differential operators with rapidly oscillating coefficients in the non-uniformly elliptic high-contrast setting, which has been out of reach of the existing ...
Cherednichenko, Kirill D., Kiselev, Alexander V.   +1 more
core   +1 more source