Results 11 to 20 of about 437,891 (285)
A maximum spreading speed for magnetopause reconnection [PDF]
Geophysical Research Letters, 2018 Past observations and numerical modeling find magnetic reconnection to initiate at a localized region and then spread along a current sheet. The rate of spreading has been proposed to be controlled by a number of mechanisms based on the properties within
Nishimura, Y. +3 more
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Spreading speeds of epidemic models with nonlocal delays
Mathematical Biosciences and Engineering, 2019 We estimate the spreading speeds in diffusive epidemic models with nonlocal delays, nonlinear incidence rate and constant recruitment rate. The purpose is to model the process that the infective invades the habitat of the susceptible, and they coexist ...
Guo Lin, Shuxia Pan, Xiang-Ping Yan
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Predicting the Speed of Epidemics Spreading in Networks [PDF]
Physical Review Letters, 2020 Global transport and communication networks enable information, ideas and infectious diseases now to spread at speeds far beyond what has historically been possible. To effectively monitor, design, or intervene in such epidemic-like processes, there is a need to predict the speed of a particular contagion in a particular network, and to distinguish ...
Sam Moore, Tim Rogers
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Spreading Speeds of Nonlocal KPP Equations in Heterogeneous Media [PDF]
Acta Mathematica Sinica, English Series, 2022 In this paper, we prove the existence of the spreading speed of nonlocal KPP equations in two cases: 1. The media is almost periodic and the kernel of diffusion is continuous; 2. The media is periodic and the diffusion is not continuous but weak irreducible.
Liang, Xing, Zhou, Tao
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Speed of quantum information spreading in chaotic systems [PDF]
Physical Review B, 2020 Added subsection on spherical subregions, corrected typos, and updated ...
Josiah Couch +4 more
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On an upper bound for the spreading speed
Discrete and Continuous Dynamical Systems - B, 2022 <p style='text-indent:20px;'>In this paper, we use the exponential transform to give a unified formal upper bound for the asymptotic rate of spread of a population propagating in a one dimensional habitat. We show through examples how this upper bound can be obtained directly for discrete and continuous time models. This upper bound has the form &
Mesk, Mohammed, Moussaoui, Ali
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Spreading speeds and spreading sets of reaction-diffusion equations
, 2021 This paper deals with the large time dynamics of bounded solutions of reaction-diffusion equations with unbounded initial support in $\mathbb{R}^N$. We prove a variational formula for the spreading speeds in any direction, and we also describe the asymptotic shape of the level sets of the solutions at large time.
Hamel, François, Rossi, Luca
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Coefficient determination via asymptotic spreading speeds [PDF]
Inverse Problems, 2014 In this paper, we analyze the inverse problem of determining the reaction term f (x, u) in reaction-diffusion equations of the form ∂tu − D∂xxu = f (x, u), where f is assumed to be periodic with respect to x ∈ R. Starting from a family of exponentially decaying initial conditions u0,λ, we show that the solutions uλ of this equation propagate with ...
Cristofol, Michel +3 more
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High-Speed Railways and the Spread of Covid-19
SSRN Electronic Journal, 2022 High-speed railways (HSRs) greatly decrease transportation costs and facilitate the movement of goods, services, and passengers across cities. In the context of the Covid-19 pandemic, however, HSRs may contribute to the cross-regional spread of the new coronavirus.
Pang, Jindong, He, Youle, Shen, Shulin
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Approximate solution to the speed of spreading viruses [PDF]
Physical Review E, 2004 Recently, it has been shown that the speed of virus infections can be explained by time-delayed reaction-diffusion [J. Fort and V. Méndez, Phys. Rev. Lett. 89, 178101 (2002)], but no analytical solutions were found. Here we derive formulas for the front speed, valid in appropriate limits.
Ortega Cejas, Vicente +3 more
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