Results 61 to 70 of about 1,325 (149)

Existence of positive solutions for non local p-Laplacian thermistor problems on time scales [PDF]

open access: yes, 2007
We make use of the Guo-Krasnoselskii fixed point theorem on cones to prove existence of positive solutions to a non local p-Laplacian boundary value problem on time scales arising in many applications. © 2007 Victoria University.
Ammi, M.R.S., Torres, D.F.M.
core   +1 more source

Why diffusion‐based preconditioning of Richards equation works: Spectral analysis and computational experiments at very large scale

open access: yesNumerical Linear Algebra with Applications, Volume 31, Issue 1, January 2024.
Abstract We consider here a cell‐centered finite difference approximation of the Richards equation in three dimensions, averaging for interface values the hydraulic conductivity K=K(p)$$ K=K(p) $$, a highly nonlinear function, by arithmetic, upstream and harmonic means.
Daniele Bertaccini   +3 more
wiley   +1 more source

Location-Dependent Prediction of Dynamic Stability Limit for Peripheral Milling of Surfaces with Variable Curvatures

open access: yesShock and Vibration, 2018
The stability limit may change with the cutter’s location due to effect of curvature during the milling of a complex surface. The method for calculating the actual radial cutting depth is presented by accounting for the effects of curvature on the actual
Baosheng Wang   +3 more
doaj   +1 more source

Stage‐parallel preconditioners for implicit Runge–Kutta methods of arbitrarily high order, linear problems

open access: yesNumerical Linear Algebra with Applications, Volume 31, Issue 1, January 2024.
Abstract Fully implicit Runge–Kutta methods offer the possibility to use high order accurate time discretization to match space discretization accuracy, an issue of significant importance for many large scale problems of current interest, where we may have fine space resolution with many millions of spatial degrees of freedom and long time intervals ...
Owe Axelsson   +2 more
wiley   +1 more source

Existence and uniqueness of the generalized Poiseuille solution for nonstationary micropolar flow in an infinite cylinder

open access: yesElectronic Journal of Differential Equations, 2018
We consider the nonstationary motion of a viscous incompressible micropolar fluid having a prescribed flux in an infinite cylinder. The global existence and uniqueness result for the generalized time-dependent Poiseuille solution is provided by means
Michal Benes   +2 more
doaj  

Parameter‐Uniform Convergent Numerical Approach for Time‐Fractional Singularly Perturbed Partial Differential Equations With Large Time Delay

open access: yesComputational and Mathematical Methods, Volume 2024, Issue 1, 2024.
In this study, we consider a parameter‐uniform convergent numerical approach for a class of time‐fractional singularly perturbed partial differential equations (TF‐SPDPDEs) with large delay in time that exhibits a regular exponential boundary layer on the right side of the spatial domain.
Habtamu Getachew Kumie   +3 more
wiley   +1 more source

Chatter Prediction for Variable Pitch and Variable Helix Milling

open access: yesShock and Vibration, 2015
Regenerative chatter is a self-excited vibration that can occur during milling, which shortens the lifetime of the tool and results in unacceptable surface quality.
Yong Wang   +5 more
doaj   +1 more source

Existence and approximation of solutions to nonlocal boundary value problems for fractional differential inclusions

open access: yesFixed Point Theory and Applications, 2019
We study a semilinear fractional order differential inclusion in a separable Banach space E of the form DqCx(t)∈Ax(t)+F(t,x(t)),t∈[0,T], $$ {}^{C}D^{q}x(t)\in Ax(t)+ F\bigl(t,x(t)\bigr),\quad t\in [0,T], $$ where DqC ${}^{C}D^{q}$ is the Caputo ...
M. Kamenskii   +3 more
doaj   +1 more source

An Unconditionally Stable Numerical Method for Space Tempered Fractional Convection‐Diffusion Models

open access: yesJournal of Mathematics, Volume 2024, Issue 1, 2024.
A second‐order numerical method for two‐sided tempered fractional convection‐diffusion equations is studied in this paper, both convection term and diffusion term are approximated by the tempered weighted and shifted Grünwald difference operators, the first time partial derivative is discretized by the Crank–Nicolson method, and then a class of second ...
Zeshan Qiu, Xian-Ming Gu
wiley   +1 more source

An Efficient Local Artificial Boundary Condition for Infinite Long Finite Element Euler–Bernoulli Beam

open access: yesShock and Vibration, Volume 2024, Issue 1, 2024.
To solve the wave propagation problems of the Euler–Bernoulli beam in an unbounded domain effectively and efficiently, a new local artificial boundary condition technology is proposed. It replaces the residual right‐hand side of the truncated discrete equation with an equivalent linear algebraic system.
Zijun Zheng   +2 more
wiley   +1 more source

Home - About - Disclaimer - Privacy