Results 61 to 70 of about 13,572,436 (276)

Are dairy cows replaced too early? Evidence from a structural model and cow‐level data

American Journal of Agricultural Economics, EarlyView.
Abstract In past analyses of animal replacement decisions, studies have claimed that dairy farms often replace dairy cows too early to be maximizing profits. I estimate a structural model of asset replacement to determine the motives behind early replacement of dairy cows.
Jared P. Hutchins
wiley   +1 more source

The implementation of the mortar spectral element discretization of the heat equation with discontinuous diffusion coefficient

Boundary Value Problems, 2019
We propose to implement the mortar spectral elements discretization of the heat equation in a bounded two-dimensional domain with a piecewise continuous diffusion coefficient. The discretization on time is based on the Euler implicit method.
Mohamed Abdelwahed, Nejmeddine Chorfi
doaj   +1 more source

Virtual Reality in Medical Education: A Concept Analysis

Clinical Anatomy, EarlyView.
ABSTRACT Virtual reality (VR) remains inconsistently defined in medical education, with the term being applied to heterogeneous immersive and nonimmersive technologies. This inconsistency may hinder intervention classification, evidence synthesis, curriculum planning, and technology selection.
Arthur Rodrigues Lima, Ana Beatriz Gabriel Silva Rodrigues, Marcos Eduardo dos Santos Targino, Ádala Nayana de Sousa Mata, Marília Souto de Araújo, Alessandra Mazzo, Eudes Euler de Souza Lucena, Raphael Raniere de Oliveira Costa   +7 more
wiley   +1 more source

Stability analysis of nonlinear delay differential-algebraic equations and of the implicit euler methods

上海师范大学学报. 自然科学版, 2016
We consider the stability and asymptotic stability of a class of nonlinear delay differential-algebraic equations and of the implicit Euler methods.Some sufficient conditions for the stability and asymptotic stability of the equations are given.These ...
JIANG Lanlan, JIN Xiangying, SUN Leping
doaj   +1 more source

Reduced Order Modelling of Shigesada-Kawasaki-Teramoto Cross-Diffusion Systems

Journal of Mathematical Sciences and Modelling, 2023
Shigesada-Kawasaki-Teramoto (SKT) is the most known equation in population ecology for nonlinear cross-diffusion systems. The full order model (FOM) of the SKT system is constructed using symmetric interior penalty discontinuous Galerkin method (SIPG ...
Gülden Mülayim
doaj   +1 more source

Preventing wall deposition in duct flows: The role of particle number density and flow direction

The Canadian Journal of Chemical Engineering, EarlyView.
Abstract Particle deposition in wall‐bounded turbulent flows is a challenge in many industries, including pneumatic conveying, filtration, and related applications. When particles accumulate near boundaries, they reduce transport efficiency, alter near‐wall flow structures, and cause blockage.
Gizem Ozler, Holger Grosshans
wiley   +1 more source

Coupled heat and mass transfer in reactive parallel‐plate flow: A perturbative Graetz model with modal symmetry and Arrhenius kinetics

The Canadian Journal of Chemical Engineering, EarlyView.
A perturbative Graetz model describes coupled heat and mass transfer in reactive Couette–Poiseuille flow between parallel plates. Viscous dissipation and heat of reaction produce a small temperature rise, which enhances Arrhenius reaction rates and modestly accelerates axial species conversion in the small‐Brinkman‐number regime.
Leonardo Damián Soria Rodríguez, Anthony Albert Harrup Gutiérrez   +1 more
wiley   +1 more source

Comparative Study of Finite Difference and Finite Element Methods for Solving 2D Parabolic Convection–Diffusion–Reaction Equations With Variable Coefficients

International Journal of Differential Equations
This study investigates the numerical solution of two-dimensional parabolic convection–diffusion–reaction (CDR) equations with variable coefficients using the finite difference method (FDM) and the finite element method (FEM).
Endalew Getnet Tsega
doaj   +1 more source

A preconditioned iterative solution scheme for nonlinear parabolic systems arising in air pollution modeling

Mathematical Modelling and Analysis, 2013
A preconditioned iterative solution method is presented for nonlinear parabolic transport systems. The ingredients are implicit Euler discretization in time and finite element discretization in space, then an outer-inner (outer damped inexact Newton ...
Janos Karatson, Tamas Kurics
doaj   +1 more source

Algebraic model for predicting the hydrodynamics of cocurrent three‐phase fluidized columns

The Canadian Journal of Chemical Engineering, EarlyView.
Abstract This study presents a novel simplified set of momentum equations to predict the overall hydrodynamics of a cocurrent gas–liquid–solid slurry bed, including phase fractions and pressure drop. The mentioned momentum closures are derived from an idealization of the upward flows within the bed of solid particles, obtained by extending an approach ...
Andreu Bernad‐Serra, Ville Alopaeus
wiley   +1 more source