Results 81 to 90 of about 66,753 (329)

Quasinormal modes of plane-symmetric black holes according to the AdS/CFT correspondence

, 2008
The electromagnetic and gravitational quasinormal spectra of $(3+1)$-dimensional plane-symmetric anti-de Sitter black holes are analyzed in the context of the AdS/CFT correspondence.
Miranda, Alex S., Morgan, Jaqueline, Zanchin, Vilson T.   +2 more
core   +2 more sources

Differential inequalities for functional perturbations of first-order ordinary differential equations

Applied Mathematics Letters, 2002
The author studies the differential system \(v'(t)+mv(t)+[p(v)](t)\leq 0\) with \(v(0)-v(T)\leq 0\). The main results conclude \(v(t)\leq 0\) for appropriate applications \(p:L^1([0,T])\to L^1([0,T])\) and real constants \(m\). A typical hypothesis states the existence of a real constant \(n\) such that \(n\min_{t\in[0,\tau]}v(t)\leq \text{ess}\inf_{t ...
openaire   +2 more sources

Hopfield Neural Networks for Online Constrained Parameter Estimation With Time‐Varying Dynamics and Disturbances

International Journal of Adaptive Control and Signal Processing, EarlyView.
This paper proposes two projector‐based Hopfield neural network (HNN) estimators for online, constrained parameter estimation under time‐varying data, additive disturbances, and slowly drifting physical parameters. The first is a constraint‐aware HNN that enforces linear equalities and inequalities (via slack neurons) and continuously tracks the ...
Miguel Pedro Silva
wiley   +1 more source

Reconstruction of inhomogeneous metric perturbations and electromagnetic four-potential in Kerr spacetime

, 2002
We present a procedure that allows the construction of the metric perturbations and electromagnetic four-potential, for gravitational and electromagnetic perturbations produced by sources in Kerr spacetime.
Amos Ori, C.O. Lousto, E. Poisson, J.M. Cohen, L. Barack, L. Barack, P.L. Chrzanowski, R.M. Wald, S.A. Teukolsky, S.A. Teukolsky, S.A. Teukolsky, Y. Mino   +11 more
core   +1 more source

An Adaptive Human Pilot Model With Reaction Time Delay for Enhanced Adaptive Control in Piloted Systems

International Journal of Adaptive Control and Signal Processing, EarlyView.
This work introduces an adaptive human pilot model that captures pilot time‐delay effects in adaptive control systems. The model enables the prediction of pilot–controller interactions, facilitating safer integration and improved design of adaptive controllers for piloted applications.
Abdullah Habboush, Yildiray Yildiz
wiley   +1 more source

Moment transport equations for the primordial curvature perturbation

, 2011
In a recent publication, we proposed that inflationary perturbation theory can be reformulated in terms of a probability transport equation, whose moments determine the correlation properties of the primordial curvature perturbation.
A.A. Starobinsky, D. Seery, D.H. Lyth, D.J. Mulryne, Daniel Wesley, David J Mulryne, David Seery, F. Vernizzi, J.M. Maldacena, L. Alabidi, M. LoVerde, S. Chongchitnan, S. Dimopoulos, S. Yokoyama, T. Battefeld, T. Tanaka, V.F. Mukhanov, X. Chen   +17 more
core   +1 more source

Difference approximations for singular perturbations of systems of ordinary differential equations

Numerische Mathematik, 1974
We consider difference methods for the solution of singular perturbations of boundary value problems.
KREISS, H.O., KELLER, H.B., Abrahamsson, L.R.   +2 more
openaire   +2 more sources

Enhancing Corrosion Resistance and Mechanical Strength of 3D‐Printed Iron Polylactic Acid for Marine Applications via Laser Surface Texturing

Advanced Engineering Materials, EarlyView.
Laser surface texturing significantly improves the corrosion resistance and mechanical strength of 3D‐printed iron polylactic acid (Ir‐PLA) for marine applications. Optimal laser parameters reduce corrosion by 80% and enhance tensile strength by 25% and ductility by 15%.
Mohammad Rezayat, Mojtaba Karamimoghadam, Mohammadreza Lalegani Dezaki, Ali Zolfagharian, Giuseppe Casalino, Antonio Mateo, Mahdi Bodaghi   +6 more
wiley   +1 more source

MHD Boundary Layer Flow near Stagnation Point of Linear Stretching Sheet with Variable Thermal Conductivity via He’s Homotopy Perturbation Method

Journal of Applied Fluid Mechanics, 2015
MHD boundary layer flow near stagnation point of linear stretching sheet with variable thermal conductivity are solved using He’s Homotopy Perturbation Method (HPM), which is one of the semi-exact method. Similarity transformation has been used to reduce
JHANKAL KUMAR ANUJ
doaj  

Stability of invariant manifold of nonlinear system of differential equations

Науковий вісник Ужгородського університету. Серія: Математика і інформатика, 2019
The theory of extensions of the dynamical equations on the torus is an important section of the theory of ordinary differential equations that is intensively evolving and has an important applied application to various tasks of science and technology ...
С. І. Балога
doaj   +1 more source