300 research outputs found
Fonctionnement et gestion des écosystèmes forestiers contractés sahéliens
La perception des formations végétales contractées par télédétection, dépend de la taille et de la forme des structures au sol, et des résolutions spatiales et spectrales des capteurs utilisés. L'objectif du présent travail est de comparer les capacités des satellites à haute définition actuels (résolution de 10 à 80 m), et des données aériennes (photographie et vidéographie) appliquées aux plateaux de l'ouest nigérien. Un indice de végétation combinant les données satellitaires SPOT multispectrales et panchromatiques est proposé. Il représente le meilleur compromis entre résolution spatiale et résolution spectrale. Une cartographie automatique des différentes formations contractées a été testée, à partir de la définition de fenêtres glissantes de 10 à 20 pixels de côté et des proportions de pixels en "sols nus" et en "végétation" caractéristiques de chaque type. Une validation au sol, réalisée par ailleurs sur 6 transects perpendiculaires à l'allongement des structures, a permis de proposer une relation entre indice et végétation et recouvrement. Un test effectué sur une zone de 25 km2 montre qu'il est possible de réaliser aisément et de façon fiable une extension spatiale des résultats. La méthode proposée constitue pour les services forestiers nationaux, un outil de suivi et de gestion des aires de production de bois. (Résumé d'auteur
Late time cosmological approach in mimetic gravity
In this paper, we investigate the late-time cosmic acceleration in mimetic
gravity with Lagrange multiplier and potential in a Universe
containing, besides radiation and dark energy, a self-interacting (collisional)
matter. We obtain through the modified Friedmann equations, the main equation
that can describe the cosmological evolution and with several models from
and the well known particular model , we perform an analysis of
the late-time evolution. We examine the behavior of the Hubble parameter, the
dark energy equation of state and the total effective equation of state and we
compare in each case the resulting picture with the non-collisional matter
(assumed as dust) and also with the collisional matter in mimetic
gravity. The results obtained are in good agreement with the observational data
and show that in presence of the collisional matter the dark energy
oscillations in mimetic f(R, T) gravity can be damped.Comment: 18 pages, 2 figure
Functional differential inclusions with integral boundary conditions
In this paper, we investigate the existence of solutions for a class of second order functional differential inclusions with integral boundary conditions. By using suitable fixed point theorems, we study the case when the right hand side has convex as well as nonconvex values
Late time cosmological approach in mimetic gravity
In this paper, we investigate the late-time cosmic acceleration in mimetic
gravity with Lagrange multiplier and potential in a Universe
containing, besides radiation and dark energy, a self-interacting (collisional)
matter. We obtain through the modified Friedmann equations, the main equation
that can describe the cosmological evolution and with several models from
and the well known particular model , we perform an analysis of
the late-time evolution. We examine the behavior of the Hubble parameter, the
dark energy equation of state and the total effective equation of state and we
compare in each case the resulting picture with the non-collisional matter
(assumed as dust) and also with the collisional matter in mimetic
gravity. The results obtained are in good agreement with the observational data
and show that in presence of the collisional matter the dark energy
oscillations in mimetic f(R, T) gravity can be damped.Comment: 18 pages, 2 figure
Impulsive Fractional Differential Inclusions Involving the Caputo Fractional Derivative
Mathematics Subject Classification: 26A33, 34A37.In this paper, we establish sufficient conditions for the existence of
solutions for a class of initial value problem for impulsive fractional differential
inclusions involving the Caputo fractional derivative. Both cases of convex
and nonconvex valued right-hand side are considered. The topological
structure of the set of solutions is also considered
New Static Solutions in f(T) Theory
We consider the equations of motion of an anisotropic space-time in
theory, where is the torsion. New spherically symmetric solutions of black
holes and wormholes are obtained with a constant torsion and the cases for
which the radial pressure is proportional to a real constant, to some algebraic
functions and their derivatives , or vanish identically.Comment: 15 pages, accepted for publication in European Physical Journal
Extended Birkhoff's Theorem in the f(T) Gravity
The f(T) theory, a generally modified teleparallel gravity, has been proposed
as an alternative gravity model to account for the dark energy phenomena.
Following our previous work [Xin-he Meng and Ying-bin Wang, EPJC(2011),
arXiv:1107.0629v1], we prove that the Birkhoff's theorem holds in a more
general context, specifically with the off diagonal tetrad case, in this
communication letter. Then, we discuss respectively the results of the external
vacuum and internal gravitational field in the f(T) gravity framework, as well
as the extended meaning of this theorem. We also investigate the validity of
the Birkhoff's theorem in the frame of f(T) gravity via conformal
transformation by regarding the Brans-Dicke-like scalar as effective matter,
and study the equivalence between both Einstein frame and Jordan frame.Comment: 7 pages, 1 figure, submitted to EPJ-C. arXiv admin note: substantial
text overlap with arXiv:1107.062
Reconstruction of some cosmological models in f(R,T) gravity
In this paper, we reconstruct cosmological models in the framework of
gravity, where is the Ricci scalar and is the trace of the
stress-energy tensor. We show that the dust fluid reproduces CDM,
phantom-non-phantom era and the phantom cosmology. Further, we reconstruct
different cosmological models including, Chaplygin gas, scalar field with some
specific forms of . Our numerical simulation for Hubble parameter shows
good agreement with the BAO observational data for low redshifts .Comment: 12 pages, 2 figure
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