Journal of Epidemiology and Community Health (JECH)

Guide to recent advances in difference-in-differences methodology for population health studies

Background Difference-in-differences is a method commonly used in population health research. It is based on assumptions that ...
IEEE

A Finite Difference Method for the Design of Gradient Coils in MRI—An Initial Framework

Abstract: This paper proposes a finite-difference (FD)-based method for the design of gradient coils in MRI. The design method first uses the FD approximation to describe the continuous current ...
IEEE

Application of a hybrid finite difference/finite volume method to solve an automotive EMC problem

Abstract: In this paper, we present a hybrid finite difference/finite volume method and we apply it to solve an automotive electromagnetic compatibility (EMC) problem. The principles of the hybrid ...
SciELO

An axisymmetric finite volume formulation for the solution of heat conduction problems using unstructured meshes

In this work, a finite volume formulation developed for two-dimensional models is extended to deal with axisymmetric models of heat conduction applications. This formulation uses a vertex centered ...
SciELO

Application of the Finite-Difference Frequency-Domain (FDFD) method on radiowave propagation in urban environments

In this work a Finite-Difference Frequency-Domain (FDFD) propagation method for complex urban environments is proposed. The formulation starts from the discretization of the Helmholtz equation for the ...
Scientific Research Publishing

A Mixed Finite Element Method for Vibration Problems of Non-Homogeneous Damped Beams ()

Beam is one of the common structures in engineering, with the development of technology, homogeneous beams no longer meet the needs of engineering structural design, for this reason, people have ...
Microwaves & RF

What's the Difference between Various EM-Simulation Numerical Methods?

This file type includes high resolution graphics and schematics when applicable. In a closed-loop mathematical system, it often is impossible to represent the complex geometries and boundary ...
Machine Design

What’s The Difference Between FEM, FDM and FVM?

What Are FEM, FDM and FVM? FEM, FDM and FVM differ from one another in important ways. Understanding these distinctions is key to selecting the method most appropriate for your purposes. The ...
Frontiers

Finite difference schemes for MHD mixed convective Darcy–forchheimer flow of Non-Newtonian fluid over oscillatory sheet: A computational study

This contribution proposes two third-order numerical schemes for solving time-dependent linear and non-linear partial differential equations (PDEs). For spatial discretization, a compact fourth-order ...
Frontiers

An optimized three-dimensional time-space domain staggered-grid finite-difference method

Numerical simulation of three-dimensional (3D) seismic wavefields forms the basis of the research on the migration methods of 3D seismic data based on wave equations. Because the simulation precision ...
Investopedia

Perpetuity: Financial Definition, Formula, and Examples

Julia Kagan is a financial/consumer journalist and former senior editor, personal finance, of Investopedia. Dr. Melody Bell is a personal finance expert, entrepreneur, educator, and researcher. Melody ...