Results 51 to 60 of about 11,022 (166)

Reducing the Possibility of Ruin by Maximizing the Survival Function for the Insurance Company’s Portfolio

Journal of Mathematics, 2022
In this paper, the intention was to reduce the possibility of ruin in the insurance company by maximizing its survival function. This paper uses a perturbed classical risk process as the basic model.
Masoud Komunte, Christian Kasumo, Verdiana Grace Masanja   +2 more
doaj   +1 more source

Composing and Factoring Generalized Green's Operators and Ordinary Boundary Problems

, 2013
We consider solution operators of linear ordinary boundary problems with "too many" boundary conditions, which are not always solvable. These generalized Green's operators are a certain kind of generalized inverses of differential operators.
A. Ben-Israel, A. Korporal, A. Korporal, A.A. Boichuk, D.G. Duffy, G. Regensburger, I. Stakgold, J. Groß, L. Guo, L. Guo, M. Rosenkranz, M. Rosenkranz, M. Rosenkranz, M. Rosenkranz, M. Rosenkranz, M.Z. Nashed, R.P. Agarwal, R.P. Agarwal, V.V. Bavula, V.V. Bavula, W.S. Loud   +20 more
core   +1 more source

ENSO Recharge Oscillator Theory Integrating the Southward Wind Shift

Geophysical Research Letters, Volume 53, Issue 8, 28 April 2026.
Abstract The El Niño–Southern Oscillation (ENSO) is one of the most‐well understood climate phenomena, and the Recharge Oscillator (RO) theory is widely used to conceptualize its physics in observations and models. ENSO‐associated equatorial zonal wind anomalies shift southward in boreal winter, contributing to ENSO termination.
Tomoki Iwakiri, Malte F. Stuecker, Fei‐Fei Jin, Sen Zhao   +3 more
wiley   +1 more source

A Certain Approximate Solutions of Nonlinear Flutter Equation

Engineering Transactions, 2015
A nonlinear integro-differential flutter equation of a thin airfoil placed in an incompressible flow is solved by two different methods. The first method involves the center-manifold reduction and gives the asymptotic limit cycle amplitude and frequency ...
J. Grzędziński
doaj   +1 more source

Multi-Component KdV Hierarchy, V-Algebra and Non-Abelian Toda Theory

, 1994
I prove the recently conjectured relation between the $2\times 2$-matrix differential operator $L=\partial^2-U$, and a certain non-linear and non-local Poisson bracket algebra ($V$-algebra), containing a Virasoro subalgebra, which appeared in the study ...
A. Bilal, A. Bilal, A. Bilal, Adel Bilal, E. Olmedilla, F. Calogero, G. Segal, I. Bakas, I. M. Gel'fand, I. M. Gel'fand, I. M. Gel'fand, J.-L. Gervais, J.-L. Gervais, M. Bruschi, P. Francesco Di, P. Mathieu, R. Hirota, V. G. Drinfel'd   +17 more
core   +1 more source

Red Blood Cell Membrane Mechanics Using Discrete Exterior Calculus (DEC) and Optimization

International Journal for Numerical Methods in Biomedical Engineering, Volume 42, Issue 4, April 2026.
We present a novel DEC approach for calculating RBC shapes applicable to other cell types and membrane problems. We derive an energy minimization equation that can be solved semi‐implicitly, and a Lie derivative method to control node spacing. This novel work should aid computational modeling in many biological situations.
Keith C. Afas, Daniel Goldman
wiley   +1 more source

Numerical approximations for population growth model by Rational Chebyshev and Hermite Functions collocation approach: A comparison

, 2010
This paper aims to compare rational Chebyshev (RC) and Hermite functions (HF) collocation approach to solve the Volterra's model for population growth of a species within a closed system.
Al-Khaled, Boyd, Boyd, Boyd, Boyd, Boyd, Christov, Coulaud, Funaro, Funaro, Guo, Guo, Guo, Guo, Guo, Guo, Guo, Guo, Iranzo, Liu, Maday, Marzban, Momani, Parand, Parand, Parand, Parand, Parand, Parand, Parand, Parand, Ramezani, Scudo, Shen, Shen, Shen, Shen, Siyyam, Small, Tang, TeBeest, Wazwaz, Xu   +42 more
core   +1 more source

A Peridynamic Framework for Modeling Progressive Failure in Porous Sandstone Indentation

International Journal for Numerical and Analytical Methods in Geomechanics, Volume 50, Issue 6, Page 2727-2743, 25 April 2026.
ABSTRACT A state‐based peridynamic model is proposed to simulate the failure mechanisms in porous rocks, using Bentheim sandstone as a specific example. Experimental observations reveal a transition from brittle to ductile failure under increasing triaxial compression. This behavior is attributed to pore compaction. The peridynamic model is enhanced to
Sahir N. Butt, Jörg Renner, Günther Meschke   +2 more
wiley   +1 more source

Fractional calculus modelling for unsteady unidirectional flow of incompressible fluids with time-dependent viscosity

, 2012
In this note we analyze a model for a unidirectional unsteady flow of a viscous incompressible fluid with time dependent viscosity. A possible way to take into account such behaviour is to introduce a memory formalism, including thus the time dependent ...
Garra, Roberto, Polito, Federico
core   +1 more source

Non‐Markovian Exceptional Points in Waveguide Quantum Electrodynamics

Advanced Quantum Technologies, Volume 9, Issue 4, April 2026.
Non‐Markovian waveguide‐QED systems exhibit dynamical transitions governed by exceptional points arising from retardation and interference. Giant atoms and spatially separated emitters display oscillatory relaxation and real zeros in the excited‐state amplitude at critical delay times.
Stefano Longhi
wiley   +1 more source