Results 71 to 80 of about 10,372 (181)

Second order parameter-uniform convergence for a finite difference method for a singularly perturbed linear reaction-diffusion system [PDF]

, 2010
A singularly perturbed linear system of second order ordinary differential equations of reaction-diffusion type with given boundary conditions is considered. The leading term of each equation is multiplied by a small positive parameter.
Miller, J. J. H., Paramasivam, M., Valarmathi, S.   +2 more
core   +2 more sources

Observation of Magnetic Pseudogap Behavior in Phosphorus‐Doped Silicon

Advanced Science, Volume 12, Issue 39, October 20, 2025.
Phosphorus‐doped silicon presents a promising platform for quantum computing and hosts a Kondo condensate state featuring a pseudogap. Thermodynamic and magnetic resonance measurements reveal that this pseudogap behavior involves critical spin fluctuations, suggesting that overlapping Kondo clouds form a correlated coherent magnetic ground state ...
Suheon Lee, Sangeun Cho, Yongcheol Jo, Wonjun Lee, Jae Min Kim, Hong Gu Lee, Yugo Oshima, Taku Matsushita, Hiroki Ikegami, Jonas A. Krieger, Christoper Baines, Thomas J. Hicken, Hubertus Luetkens, Eundeok Mun, Jungseek Hwang, Hyunsik Im, Kwang‐Yong Choi   +16 more
wiley   +1 more source

Current Practices for Analyzing Soils and Sediments via Mössbauer Spectroscopy

Journal of Plant Nutrition and Soil Science, Volume 188, Issue 5, Page 742-773, October 2025.
ABSTRACT Environmental scientists are increasingly returning to Mössbauer spectroscopy (MBS) to reveal details about iron (Fe)‐bearing phases in soils and sediments. MBS is particularly powerful at distinguishing between Fe(II) and Fe(III) and, given appropriate background information, can offer exceptionally precise information on Fe speciation in ...
Aaron Thompson, James M. Byrne, Carolin L. Dreher, Andrew R. C. Grigg, Prachi Joshi, Drew E. Latta, Anke Neumann, Luiza Notini, Katie E. B. O'Neill, Katherine A. Rothwell   +9 more
wiley   +1 more source

Slow invariant manifold of heartbeat model [PDF]

, 2014
A new approach called Flow Curvature Method has been recently developed in a book entitled Differential Geometry Applied to Dynamical Systems. It consists in considering the trajectory curve, integral of any n-dimensional dynamical system as a curve in ...
Ginoux, Jean-Marc, Rossetto, Bruno
core  

Singularly perturbed ordinary differential equations

Journal of Mathematical Analysis and Applications, 1992
Consider abstract nonlinear equations of the form (*) \(Lu+\varepsilon F(u,v)=0\), \(S(v)+\varepsilon V(u,v)=0\) where \(L\) is linear, \(\varepsilon\) is a small parameter. By using the coincidence degree the author derives conditions on the operators such that (*) has a solution.
openaire   +1 more source

Disentangling the effects of climate change in a mountain lake through community structure analysis

Limnology and Oceanography, Volume 70, Issue 8, Page 2142-2157, August 2025.
Abstract Pressures of climate change may trigger regime shifts in ecosystems. Identifying signs of these pressures before the critical transition remains challenging, and it could be useful to anticipate the regime shift. In this research, while exploiting the case of a lacustrine ecosystem, which passed from an unvegetated, phytoplankton‐dominated ...
Giulia Bertoletti, Marco Scotti, Giampaolo Rossetti, Antonio Bodini   +3 more
wiley   +1 more source

Multistable Composite Laminate Grids as a Design Tool for Soft Reconfigurable Multirotors

Advanced Intelligent Systems, Volume 7, Issue 7, July 2025.
Flexible, lightweight, stable: the reconfigurable multirotor combines stable flight in multiple shapes with low‐energy reconfiguration. Utilizing optimized multistable composites, it achieves self‐locking in open and folded configurations, cutting width‐span by 48% and allowing for safe gap traversal.
Luca Girardi, Giada Risso, Laura Pesaresi, Paolo Ermanni, Stefano Mintchev   +4 more
wiley   +1 more source

Experimental noise and light pollution alter prey detection in a nocturnal bird of prey

Journal of Animal Ecology, Volume 94, Issue 7, Page 1398-1409, July 2025.
The study explores combined effects of noise and light pollution in a nocturnal avian predator and shows that both noise and light affect owls' ability to detect prey acoustically but not visually. Lower prey detection might decrease hunting success and fitness, and eventually lead to a shift in hunting strategies.
Arianna Passarotto, Chiara Morosinotto, Patrik Karell   +2 more
wiley   +1 more source

Neural Ordinary Differential Equations for Model Order Reduction of Stiff Systems

International Journal for Numerical Methods in Engineering, Volume 126, Issue 12, 30 June 2025.
ABSTRACT Neural Ordinary Differential Equations (ODEs) represent a significant advancement at the intersection of machine learning and dynamical systems, offering a continuous‐time analog to discrete neural networks. Despite their promise, deploying neural ODEs in practical applications often encounters the challenge of stiffness, a condition where ...
Matteo Caldana, Jan S. Hesthaven
wiley   +1 more source

Analytical Solutions and Computer Modeling of a Boundary Value Problem for a Nonstationary System of Nernst–Planck–Poisson Equations in a Diffusion Layer

Mathematics
This article proposes various new approximate analytical solutions of the boundary value problem for the non-stationary system of Nernst–Planck–Poisson (NPP) equations in the diffusion layer of an ideally selective ion-exchange membrane at overlimiting ...
Savva Kovalenko, Evgenia Kirillova, Vladimir Chekanov, Aminat Uzdenova, Mahamet Urtenov   +4 more
doaj   +1 more source