Zobrazeno 1 - 10 of 41 pro vyhledávání: '"Claudia Negulescu"'
1
Mathematical Study of a Lagrange-Multiplier Technique for Stiff Transport Problems
Autor: Claudia Negulescu
Publikováno v: Multiscale Modeling & Simulation. 19:802-829
The Lagrange-multiplier technique is a multiscale numerical scheme designed to solve evolution problems containing some stiff transport terms. Such multiscale problems arise very often in kinetic m...
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::39b9cd1c1dc1c0dad74c982db14d5579
https://doi.org/10.1137/20m1333717
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2
Mathematical modelling of charge transport in graphene heterojunctions
Autor: Vittorio Romano, Claudia Negulescu, Giovanni Nastasi, Luigi Barletti
A typical graphene heterojunction device can be divided into two classical zones, where the transport is basically diffusive, separated by a "quantum active region" (e.g., a locally gated region), where the charge carriers are scattered according to
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::45523a3922f997e3ad3ea9f1133d5a08
http://hdl.handle.net/20.500.11769/510009
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4
Quantum Transmission Conditions for Diffusive Transport in Graphene with Steep Potentials
Autor: Luigi Barletti, Claudia Negulescu
Publikováno v: Journal of Statistical Physics. 171:696-726
We present a formal derivation of a drift-diffusion model for stationary electron transport in graphene, in presence of sharp potential profiles, such as barriers and steps. Assuming the electric potential to have steep variations within a strip of v
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c557facd434b60e3bed54678ac8429c7
https://doi.org/10.1007/s10955-018-2032-y
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5
Numerical study of an anisotropic Vlasov equation arising in plasma physics
Autor: Baptiste Fedele, Claudia Negulescu
Publikováno v: Kinetic & Related Models
Kinetic and Related Models
Kinetic and Related Models, 2018, 11 (6), pp.1395-1426. ⟨10.3934/krm.2018055⟩
Kinetic and Related Models, AIMS, 2018, 11 (6), pp.1395-1426. ⟨10.3934/krm.2018055⟩
International audience; Goal of this paper is to investigate several numerical schemes for the resolution of two anisotropic Vlasov equations. These two toy-models are obtained from a kinetic description of a tokamak plasma confined by strong magneti
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5010b84f03c04f51d713bc85c238767d
https://doi.org/10.3934/krm.2018055
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6
Analysis of the Kolmogorov model with an asymptotic-preserving method
Autor: Maurizio Ottaviani, Baptiste Fedele, Claudia Negulescu
Publikováno v: Physics Letters A. 410:127522
We study the Kolmogorov model of a shear flow by means of a newly developed Asymptotic-Preserving method for the numerical resolution of the two-dimensional vorticity-Poisson (Navier-Stokes) system. The scheme is validated by comparing the results wi
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ca91c2331f60f208036cf558f0877518
https://doi.org/10.1016/j.physleta.2021.127522
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7
Stationary Schrödinger equation in the semi-classical limit: numerical coupling of oscillatory and evanescent regions
Autor: Anton Arnold, Claudia Negulescu
Publikováno v: Numerische Mathematik
Numerische Mathematik, Springer Verlag, 2018, 138 (2), pp.501-536
Numerische Mathematik, 2018, 138 (2), pp.501-536
This paper is concerned with a 1D Schr\"odinger scattering problem involving both oscillatory and evanescent regimes, separated by jump discontinuities in the potential function, to avoid "turning points". We derive a non-overlapping domain decomposi
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::43bf38a1f65cdad3d9c9ce7e78982918
https://hal.archives-ouvertes.fr/hal-01979736
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8
Asymptotic-Preserving scheme for a strongly anisotropic vorticity equation arising in fusion plasma modeling
Autor: Andrea Mentrelli, Claudia Negulescu
Publikováno v: Computer Physics Communications
Computer Physics Communications, Elsevier, 2018, 229, pp.116-128
Computer Physics Communications, 2018, 229, pp.116-128
The electric potential is an essential quantity for the confinement process of tokamak plasmas, with important impact on the performances of fusion reactors. Understanding its evolution in the peripheral region - the part of the plasma interacting wi
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::db37ee4c6bd4df12ed9aa79673e029d5
http://hdl.handle.net/11585/653592
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9
Solvable models of quantum beating
Autor: Rodolfo Figari, Lorenzo Tentarelli, Claudia Negulescu, Raffaele Carlone
Publikováno v: Nanosystems: Physics, Chemistry, Mathematics
Nanosystems: Physics, Chemistry, Mathematics, 2018, 9 (2), pp.162-170
Nanosystems: Physics, Chemistry, Mathematics, St. Petersburg National Research University of Information Technologies, Mechanics and Optics., 2018, 9 (2), pp.162-170
We review some results about the suppression of quantum beating in a one dimensional nonlinear double well potential. We implement a single particle double well potential model, making use of nonlinear point interactions. We show that there is comple
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8e6ee603a61c33727588d231036dd9b7
http://hdl.handle.net/11583/2771917
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10
Hybrid Classical-Quantum Models for Charge Transport in Graphene with Sharp Potentials
Autor: Claudia Negulescu, Luigi Barletti
Publikováno v: Journal of Computational and Theoretical Transport
Journal of Computational and Theoretical Transport, 2017, 46 (3), pp.159-175
We give a concise account on the derivation of hybrid quantum-classical models for stationary electron transport in graphene, in presence of sharp potential steps of barriers. A quantum region (an asymptotically thin strip around the potential step o
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::15dea0a1dc9ab2c5c314c9cec6c0e4d0
https://hal.archives-ouvertes.fr/hal-01979417
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