Results 31 to 40 of about 7,462,032 (343)

Numerical simulations of sunspots [PDF]

open access: yesProceedings of the International Astronomical Union, 2006
AbstractThe origin, structure and evolution of sunspots are investigated using a numerical model. The compressible MHD equations are solved with physical parameter values that approximate the top layer of the solar convection zone. A three dimensional (3D) numerical code is used to solve the set of equations in cylindrical geometry, with the numerical ...
Alistair Rucklidge   +2 more
openaire   +3 more sources

Numerical simulation of electrocardiograms

open access: yes, 2012
This chapter presents a concise overview of various mathematical and numerical problems raised by the simulation of electrocardiograms (ECGs). A model for the propagation of the electrical activation in the heart and in the torso is proposed. Some of its mathematical properties are analyzed.
Boulakia, Muriel   +3 more
openaire   +6 more sources

Threshold Dynamics of a Huanglongbing Model with Logistic Growth in Periodic Environments

open access: yesAbstract and Applied Analysis, 2014
We analyze the impact of seasonal activity of psyllid on the dynamics of Huanglongbing (HLB) infection. A new model about HLB transmission with Logistic growth in psyllid insect vectors and periodic coefficients has been investigated.
Jianping Wang   +3 more
doaj   +1 more source

Improved Bayesian Network-Based Risk Model and Its Application in Disaster Risk Assessment

open access: yesInternational Journal of Disaster Risk Science, 2018
The application of Bayesian network (BN) theory in risk assessment is an emerging trend. But in cases where data are incomplete and variables are mutually related, its application is restricted. To overcome these problems, an improved BN assessment model
Ming Li, Mei Hong, Ren Zhang
doaj   +1 more source

Role of vector resistance and grafting infection in Huanglongbing control models

open access: yesInfectious Disease Modelling, 2023
Citrus huanglongbing (HLB) is one of the most devastating diseases affecting citrus almost worldwide due to the lack of a cure. To better understand the impact of insecticide resistance and grafting infection on the spread of HLB disease, a vector-borne ...
Shuimei Tang   +3 more
doaj  

Numerical simulation of "an American haboob" [PDF]

open access: yesAtmospheric Chemistry and Physics, 2013
Abstract. A dust storm of fearful proportions hit Phoenix in the early evening hours of 5 July 2011. This storm, an American haboob, was predicted hours in advance because numerical, land–atmosphere modeling, computing power and remote sensing of dust events have improved greatly over the past decade.
Matthew R. Kumjian   +14 more
openaire   +6 more sources

Numerical Analysis of Fourier Finite Volume Element Method for Dirichlet Boundary Optimal Control Problems Governed by Elliptic PDEs on Complex Connected Domains

open access: yesMathematics, 2022
In this research, we investigate an optimal control problem governed by elliptic PDEs with Dirichlet boundary conditions on complex connected domains, which can be utilized to model the cooling process of concrete dam pouring.
Mengya Su, Liuqing Xie, Zhiyue Zhang
doaj   +1 more source

A fast direct numerical simulation method for characterising hydraulic roughness [PDF]

open access: yesJournal of Fluid Mechanics, 2015
We describe a fast direct numerical simulation (DNS) method that promises to directly characterise the hydraulic roughness of any given rough surface, from the hydraulically smooth to the fully rough regime.
D. Chung   +4 more
semanticscholar   +1 more source

CMPF-UNet: a ConvNeXt multi-scale pyramid fusion U-shaped network for multi-category segmentation of remote sensing images

open access: yesGeocarto International
Most U-shaped convolutional neural network (CNN) methods have the problems of insufficient feature extraction and fail to fully utilize global/multi-scale context information, which makes it difficult to distinguish similar objects and shadow occluded ...
Ning Li, Xiaopeng Yu, Miao Yu
doaj   +1 more source

Numerical simulations in particle physics [PDF]

open access: yesReports on Progress in Physics, 1993
Numerical simulations have become an important tool to understand and predict non-perturbative phenomena in particle physics. In this article we attempt to present a general overview over the field. First, the basic concepts of lattice gauge theories are described, including a discussion of currently used algorithms and the reconstruction of continuum ...
Karsch, Frithjof, Laermann, Edwin
openaire   +4 more sources

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