Results 51 to 60 of about 148,162,886 (209)

A tipping point for tipping points

Oikos, EarlyView.
Tipping points (TPs) – often understood as abrupt changes to a system – have become a popular framework for ecology and environmental science across spatial and temporal scales. The underlying, quantitative foundation of TP theory is built on mathematical models from catastrophe and predator–prey theories.
David G. Jenkins, Alexandria G. Lacoursière   +1 more
wiley   +1 more source

On the solution to a two-dimensional boundary value problem of heat conduction in a degenerating domain

Қарағанды университетінің хабаршысы. Математика сериясы, 2020
The article considers a homogeneous boundary - value problem for the heat equation in the non - cylindrical domain, namely, in an inverted pyramid with a vertex at the origin of coordinates, two faces of which lie in coordinate planes.A solution to the ...
M.T. Kosmakova, V.G. Romanovski, D.M. Akhmanova, Zh.M. Tuleutaeva, A.Yu. Bartashevich   +4 more
doaj  

An explicit numerical algorithm to the solution of Volterra integral equation of the second kind

CoRR, 2019
This paper considers a numeric algorithm to solve the equation \begin{align*} y(t)=f(t)+\int^t_0 g(t-τ)y(τ)\,dτ\end{align*} with a kernel $g$ and input $f$ for $y$. In some applications we have a smooth integrable kernel but the input $f$ could be a generalised function, which could involve the Dirac distribution. We call the case when $f=δ$, the Dirac
Leanne Dong, John van der Hoek
openaire   +2 more sources

Adaptive harvesting of two trophic levels stabilises predator–prey dynamics. Simulations with Eurasian lynx and European roe deer

Wildlife Biology, EarlyView.
Europe has seen the recovery of many species of wild herbivores, which are now widespread across much of the continent. In addition, large carnivores are also recolonising many European countries. Most ungulates are managed through hunting, but natural predation can also have a significant influence in many areas.
Cécile A. E. Carpentier, Marco Heurich, Olivier Devineau, Olivier Gimenez, John D. C. Linnell   +4 more
wiley   +1 more source

On the Stability of Numerical Methods for Nonlinear Volterra Integral Equations

Discrete Dynamics in Nature and Society, 2010
Here we investigate the behavior of the analytical and numerical solution of a nonlinear second kind Volterra integral equation where the linear part of the kernel has a constant sign and we provide conditions for the boundedness or decay of solutions ...
E. Messina, Y. Muroya, E. Russo, A. Vecchio   +3 more
doaj   +1 more source

DISCO: a general software tool for dislocation contrast factor calculations in diffraction analysis

Journal of Applied Crystallography, EarlyView.
DISCO is a program capable of calculating the X‐ray contrast factor for single‐ and polycrystalline materials in real time.Dislocation contrast factors (CFs) play a central role in diffraction‐based analyses of plastic deformation, linking the elastic strain fields generated by dislocations to diffraction line broadening.
Marcelo Augusto Malagutti, Mirco D'Incau, Paolo Scardi   +2 more
wiley   +1 more source

Numerical algorithms to solve one inverse problem for Navier–Stokes equations

Nonlinear Analysis
This model describes the Poiseuille type solution in the nonstationary case of the Navier–Stokes problem. An equivalent form of PDE problem is defined as the first-kind Volterra integral equation.
Raimondas Čiegis
doaj   +1 more source

ON A WAY FOR SOLVING VOLTERRA INTEGRAL EQUATION OF THE SECOND KIND

International Journal of Research -GRANTHAALAYAH, 2022
There are many classes’ methods for finding of the approximately solution of Volterra integral equations of the second kind. Recently, the numerical methods have been developed for solving the integral equations of Volterra type, which is associated with the using of computers.
openaire   +2 more sources

Insights for conservation from the Ecological Knowledge Games project

Conservation Biology, EarlyView.
Abstract Environmental conservation research requires robust methods for collecting large‐scale behavioral data and engaging diverse stakeholders in decision‐making processes. We (Y.P., A.B.D., and N.B.) created EcoKnowGames (Ecological Knowledge Games), a transdisciplinary project that develops knowledge games for conservation science and data ...
Yuan Pan, A. Bradley Duthie, Isabel Jones, Daksha Patel, Nils Bunnefeld   +4 more
wiley   +1 more source

Measure‐valued processes for energy markets

Mathematical Finance, Volume 35, Issue 2, Page 520-566, April 2025.
Abstract We introduce a framework that allows to employ (non‐negative) measure‐valued processes for energy market modeling, in particular for electricity and gas futures. Interpreting the process' spatial structure as time to maturity, we show how the Heath–Jarrow–Morton approach can be translated to this framework, thus guaranteeing arbitrage free ...
Christa Cuchiero, Luca Di Persio, Francesco Guida, Sara Svaluto‐Ferro   +3 more
wiley   +1 more source