Results 81 to 90 of about 3,408 (247)

Optimal State Estimation in an Overland Flow Model Using the Adjoint Method [PDF]

, 2014
International audienceIn this paper, an optimal estimation method for initial conditions in an overland flow based on the adjoint method is presented. This system is described by an infinite dimensional model given by the first continuity equation of the
Nguyen, van Tri, Georges, Didier, Gildas Besancon, Besancon, Gildas, Van Tri Nguyen, Didier Georges   +5 more
core   +1 more source

BART Streams: Real‐Time Reconstruction Using a Modular Framework for Pipeline Processing

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose To create modular solutions for interactive real‐time MRI using reconstruction algorithms implemented in BART. Methods A new protocol for streaming of multidimensional arrays is presented and integrated into BART. The new functionality is demonstrated using examples for cardiac interactive real‐time MRI based on radial FLASH, where ...
Philip Schaten, Moritz Blumenthal, Bernhard Rapp, Christina Unterberg‐Buchwald, Martin Uecker   +4 more
wiley   +1 more source

The adjoint variable method in inverse electromagnetic shielding problem [PDF]

, 2008
We study the optimization problem for the time-harmonic Maxwell equations involving determination of optimal shape and position of conductors, coils and other parts of an electromagnetic shielding problem.
Cimrak, Ivan, Durand, Stephane
core  

A level set based topology optimization for elastodynamic problems using BEM

Frontiers in Physics
The paper presents a topology optimization methodology for 2D elastodynamic problems using the boundary element method (BEM). The topological derivative is derived based on the variation method and the adjoint variable method.
Huiwen Li, Huiwen Li, Haifeng Gao, Jianguo Liang, Zhiqiang Li, Huidong Xu, Changjun Zheng   +6 more
doaj   +1 more source

Feasibility and SNR Performance of Hyperpolarized 129Xe Gas Exchange Imaging Using a Balanced SSFP Sequence

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose To develop a balanced SSFP (bSSFP) sequence for pulmonary 129Xe dissolved‐phase imaging based on a previously described double‐echo sequence facilitating separation into red blood cell and membrane signals, to test its feasibility and compare its SNR performance and imaging results to an analogous FLASH sequence.
Agilo L. Kern, Marcel Gutberlet, Jens M. Hohlfeld, Frank Wacker, Jens Vogel‐Claussen   +4 more
wiley   +1 more source

Design Sensitivities By the Adjoint Variable Method in Nonlinear Structural Dynamics [PDF]

, 2007
This paper describes a new algorithm to calculate gradients of system responses with respect to design changes. The algorithm uses the adjoint variable method, and is compared with an algorithm employing the direct differentiation method. Both algorithms
Arne Marthinsen, Ole Ivar Sivertsen, Sigurd D. Trier   +2 more
core  

Lie symmetry based-analytical and numerical approach for modified Burgers-KdV equation

Results in Physics, 2018
In this work, the variable-coefficient modified Burgers-KdV equation, which arises in modeling various physical phenomena, is studied for exact and numerical solution based on Lie symmetry.
Vikas Kumar, Lakhveer Kaur, Ajay Kumar, Mehmet Emir Koksal   +3 more
doaj   +1 more source

Solving the Boundary Value Problems for Differential Equations with Fractional Derivatives by the Method of Separation of Variables

Mathematics, 2020
This paper is devoted to solving boundary value problems for differential equations with fractional derivatives by the Fourier method. The necessary information is given (in particular, theorems on the completeness of the eigenfunctions and associated ...
Temirkhan Aleroev
doaj   +1 more source

Optimal Control Analysis of Vertically Transmitted Infectious Diseases With Saturated Incidence and Nonlinear Treatment

Optimal Control Applications and Methods, EarlyView.
Schematic representation of the proposed disease transmission model incorporating vertical transmission, saturated incidence, and nonlinear treatment. The study combines theoretical analysis, bifurcation and stability investigations, and optimal control techniques to evaluate prevention and treatment interventions.
Oludolapo A. Olanrewaju, Sulaimon F. Abimbade   +1 more
wiley   +1 more source

Estimation of heat flux by using reduced model and the adjoint method. Application to a brake disc rotating [PDF]

, 2018
International audienceIn this study, an approach for inverse problem is proposed to estimate a time dependent heat flux on a braking system. This approach combines modal reduction and conjugate gradient method with adjoint method.
Joly, Frédéric, Y. Rouizi, F. Joly, Carmona, S., Rouizi, Yassine, S. Carmona, Neveu, Alain, O. Quéméner, A. Neveu, Quéméner, Olivier   +9 more
core   +1 more source