Výsledky vyhledávání - "Gaspar J. Machado"

An a posteriori strategy for adaptive schemes in time for one-dimensional advection-diffusion transport equations

Autor: M.T. Malheiro, Gaspar J. Machado, Stéphane Clain

Publikováno v: Computers & Mathematics with Applications. 103:65-81

Stability condition is a more restrictive constraint that leads to unnecessary small-time steps with respect to the accuracy and results in computational time wastage. We propose a node by node adaptive time scheme to relax the stability constraint e

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b9629b50e593fb72f14eb24dd8e655c3
https://doi.org/10.1016/j.camwa.2021.10.022

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Designing and Randomising Multiple-Choice Questions for E-Learning in Mathematics Using MVGEN

Autor: Irene Brito, Gaspar J. Machado, José João Almeida

MVGEN is a multi-version question generation tool that allows creating multiple-choice questions with a large number of versions and multi-version tests using different randomisation techniques. These techniques include simple randomisation through s

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::76f8741f0239230c8132ad7f8899e247
https://doi.org/10.4018/978-1-7998-9706-4.ch009

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Efficient very high-order accurate polyhedral mesh finite volume scheme for 3D conjugate heat transfer problems in curved domains

Autor: João M. Nóbrega, Gaspar J. Machado, Stéphane Clain, Ricardo Costa

Publikováno v: Repositório Científico de Acesso Aberto de Portugal
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP

The conjugate heat transfer problem is found in many engineering applications and comprises the heat transfer between solids and fluids in contact. The discretization method of these problems must guarantee that the interface conditions are properly

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6aa55439fbf9e9189c49e2bf6e7abcfd
https://hdl.handle.net/1822/75354

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Very high-order accurate finite volume scheme for the steady-state incompressible Navier–Stokes equations with polygonal meshes on arbitrary curved boundaries

Autor: Ricardo Costa, Stéphane Clain, Gaspar J. Machado, João M. Nóbrega

Publikováno v: Computer Methods in Applied Mechanics and Engineering. 396:115064

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::850e39ad6ab0bcbc97f62be795bc48c6
https://doi.org/10.1016/j.cma.2022.115064

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A Posteriori Stabilized Sixth-Order Finite Volume Scheme with Adaptive Stencil Construction: Basics for the 1D Steady-State Hyperbolic Equations

Autor: Stéphane Clain, Raphaël Loubère, Gaspar J. Machado

Publikováno v: Communications on Applied Mathematics and Computation
Communications on Applied Mathematics and Computation, Springer, 2021, ⟨10.1007/s42967-021-00140-7⟩

We propose an adaptive stencil construction for high-order accurate finite volume schemes a posteriori stabilized devoted to solve one-dimensional steady-state hyperbolic equations. High accuracy (up to the sixth-order presently) is achieved, thanks

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5b0e604799fd1ed988bda515364ccf85
https://hal.archives-ouvertes.fr/hal-03358691

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A new stabilised scheme for the Richards’ equation with evapotranspiration

Autor: Gaspar J. Machado, Rui M.S. Pereira, Stéphane Clain, Nuno Araújo, Sofia O. Lopes

Publikováno v: Groundwater for Sustainable Development. 17:100736

A new second-order stabilised numerical method for the Richards' equation with source term is proposed to solve the water infiltration in porous soil. This new method to solve Richard's equation is based on a modification of the head pressure represe

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fc044995074f2914d28a6ebc753453d6
https://doi.org/10.1016/j.gsd.2022.100736

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A new energy conservation scheme for the numeric study of the heat transfer in profile extrusion calibration

Autor: Stéphane Clain, Olga S. Carneiro, Filipe Marques, Bruno Oliveira Martins, João M. Nóbrega, Gaspar J. Machado

Publikováno v: Repositório Científico de Acesso Aberto de Portugal
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP

In this work, a new second-order conservative finite volume scheme using the cell-to-vertex interpolation is proposed to solve the heat transfer problem involving discontinuous solution and discontinuous materials properties. We apply the method to a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::30858177385966780c587ea62a508797
https://doi.org/10.1007/s00231-017-2023-6

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Mvgen: multi version question generation for math courses

Autor: Irene Brito, Gaspar J. Machado, José João Almeida

Publikováno v: Repositório Científico de Acesso Aberto de Portugal
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP
Open Education Studies, Vol 1, Iss 1, Pp 146-150 (2019)

A question generating system developed in Perl that uses LaTeX as typographical language is presented, which, besides random generation of different question types, allows a random creation of a large number of different test versions. Examples of qu

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::55de6dc0591b45fe30115321296bf6a7
https://hdl.handle.net/1822/62805

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