Zobrazeno 1 - 10
of 329
pro vyhledávání: '"Igor Leite"'
Autor:
Priscilla Azevedo dos Santos, Helena Saraiva Koenow Pinheiro, Waldir de Carvalho Júnior, Igor Leite da Silva, Nilson Rendeiro Pereira, Silvio Barge Bhering, Marcos Bacis Ceddia
Publikováno v:
Revista Brasileira de Ciência do Solo, Vol 47 (2023)
ABSTRACT Pedosphere-hydrosphere interface accounts for the association between soil hydrology and landscape, represented by topographic and Remote Sensing data support and integration. This study aimed to analyze different statistical radiometric and
Externí odkaz:
https://doaj.org/article/e9400bbaf1c94d8baa6bdd71ce6383c6
We study an integrable equation whose solutions define a triad of one-forms describing a surface with Gaussian curvature -1. We identify a local group of diffeomorphisms that preserve these solutions and establish conserved quantities. From the symme
Externí odkaz:
http://arxiv.org/abs/2409.01537
Autor:
André Almeida, Fabio Gonçalves, Gilson Silva, Adriano Mendonça, Maria Gonzaga, Jeferson Silva, Rodolfo Souza, Igor Leite, Karina Neves, Marcus Boeno, Braulio Sousa
Publikováno v:
Remote Sensing, Vol 13, Iss 18, p 3655 (2021)
Digital aerial photogrammetry (DAP) data acquired by unmanned aerial vehicles (UAV) have been increasingly used for forest inventory and monitoring. In this study, we evaluated the potential of UAV photogrammetry data to detect individual trees, esti
Externí odkaz:
https://doaj.org/article/a2c4ab7b0b764f6a83b8324dbbc7cb71
Autor:
Freire, Igor Leite
Publikováno v:
J Nonlinear Sci 35, 3 (2025)
We prove that both local and non-local formulations of the Degasperis-Procesi equation possess a pseudospherical nature. As a result, solutions determined by Cauchy problems with non-trivial initial data and a minimal specific regularity define an or
Externí odkaz:
http://arxiv.org/abs/2311.05226
Autor:
Freire, Igor Leite
Pseudospherical surfaces determined by Cauchy problems involving the Camassa-Holm equation are considered herein. We study how global solutions influence the corresponding surface, as well as we investigate two sorts of singularities of the metric: t
Externí odkaz:
http://arxiv.org/abs/2310.18941
Publikováno v:
Proc. R. Soc. A., vol. 480, paper 20230670, 2024
We study implications and consequences of well-posed solutions of Cauchy problems of a Novikov equation describing pseudospherical surfaces. We show that if the co-frame of dual one-forms satisfies certain conditions for a given periodic initial datu
Externí odkaz:
http://arxiv.org/abs/2309.06291
Publikováno v:
Advances in Mathematical Physics, Vol 2017 (2017)
Externí odkaz:
https://doaj.org/article/11db7cea6e9d4bb4b04225f8e3a7b53e
Autor:
Freire, Igor Leite
We consider persistence properties of solutions for a generalised wave equation including vibration in elastic rods and shallow water models, such as the BBM, the Dai's, the Camassa-Holm, and the Dullin-Gottwald-Holm equations, as well as some recent
Externí odkaz:
http://arxiv.org/abs/2212.10034
Autor:
Igor Leite Freire, Mariano Torrisi
Publikováno v:
Abstract and Applied Analysis, Vol 2014 (2014)
A class of reaction-diffusion systems unifying several Aedes aegypti population dynamics models is considered. Equivalence transformations are found. Extensions of the principal Lie algebra are derived for some particular cases.
Externí odkaz:
https://doaj.org/article/a89753b2cfc542d8962b8ac90f2fa0fa
Publikováno v:
Abstract and Applied Analysis, Vol 2014 (2014)
The concepts of strictly, quasi, weak, and nonlinearly self-adjoint differential equations are revisited. A nonlinear self-adjoint classification of a class of equations with second and third order is carried out.
Externí odkaz:
https://doaj.org/article/55cec8a257494332b576a632a995810d