Results 41 to 50 of about 238,303 (293)

Momentum-carrying waves on D1-D5 microstate geometries

open access: yes, 2012
If one attempts to add momentum-carrying waves to a black string then the solution develops a singularity at the horizon; this is a manifestation of the 'no hair theorem' for black objects.
Mathur, Samir D., Turton, David
core   +1 more source

New Dimensions for Wound Strings: The Modular Transformation of Geometry to Topology [PDF]

open access: yes, 2006
We show, using a theorem of Milnor and Margulis, that string theory on compact negatively curved spaces grows new effective dimensions as the space shrinks, generalizing and contextualizing the results in hep-th/0510044. Milnor's theorem relates negative
A. Manning   +12 more
core   +5 more sources

Long Wavelength Coherency in Well Connected Electric Power Networks

open access: yesIEEE Access, 2022
We investigate coherent oscillations in large scale transmission power grids, where large groups of generators respond in unison to a distant disturbance. Such long wavelength coherent phenomena are known as inter-area oscillations.
Julian Fritzsch, Philippe Jacquod
doaj   +1 more source

Path ensembles averages in systems driven far-from-equilibrium

open access: yes, 1999
The Kawasaki nonlinear response relation, the transient fluctuation theorem, and the Jarzynski nonequilibrium work relation are all expressions that describe the behavior of a system that has been driven from equilibrium by an external perturbation.
Crooks, Gavin E.
core   +1 more source

The role of inertia for the rotation of a nearly spherical particle in a general linear flow [PDF]

open access: yes, 2015
We analyse the angular dynamics of a neutrally buoyant nearly spherical particle immersed in a steady general linear flow. The hydrodynamic torque acting on the particle is obtained by means of a reciprocal theorem, regular perturbation theory exploiting
B. Mehlig   +11 more
core   +2 more sources

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

open access: yesInternational 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

Positivity and contractivity in the dynamics of clusters’ splitting with derivative of fractional order

open access: yesOpen Mathematics, 2015
Classical models of clusters’ fission have failed to fully explain strange phenomenons like the phenomenon of shattering (Ziff et al., 1987) and the sudden appearance of infinitely many particles in some systems with initial finite particles number ...
Goufo Emile Franc Doungmo   +1 more
doaj   +1 more source

Complete Rank Theorem in Advanced Calculus and Frobenius Theorem in Banach Space [PDF]

open access: yes, 2015
The application of generalized inverses is usually neglected in pure mathematical research. However, it is very effective for this paper. We expand the famous matrix rank theorem due to R. Penrose to operators between Banach paces.
Ma, Jipu
core  

Robustness for a Liouville type theorem in exterior domains [PDF]

open access: yes, 2013
We are interested in the robustness of a Liouville type theorem for a reaction diffusion equation in exterior domains. Indeed H. Berestycki, F. Hamel and H. Matano (2009) proved such a result as soon as the domain satisfies some geometric properties.
H Berestycki, Juliette Bouhours
core   +4 more sources

Perturbations in Müntz's theorem

open access: yesJournal of Approximation Theory, 2008
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
openaire   +2 more sources

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