Zobrazeno 1 - 10
of 258
pro vyhledávání: '"Luiz, F. S."'
This paper studies the number of centers and limit cycles of the family of planar quartic polynomial vector fields that has the invariant algebraic curve $(4x^2-1)(4y^2-1)=0.$ The main interest for this type of vector fields comes from their appearan
Externí odkaz:
http://arxiv.org/abs/2410.15354
Autor:
Alves, Raphael, Estácio, Sabrina, Frómeta, Susana, Jara, Milton, Marinho, Rodrigo, Marques, Luiz F. S., Pimenta, João V. A.
When we want to simulate the realization of a symmetric simple random walk on $\mathbb Z^d$, we use $(2d)$-side fair dice to decide to which neighbor it jumps at each step if $d\geq 2$ or we simply use a fair coin when $d=1$. Assume that instead of u
Externí odkaz:
http://arxiv.org/abs/2410.00831
In this work, our primary goal is to study the Poincare map and the existence of limit cycles for Welander's model that describes ocean convection. Welander developed two versions of his model, one with a smooth transition between convective states,
Externí odkaz:
http://arxiv.org/abs/2309.03430
Our main goal in this paper is to study the number of small-amplitude isolated periodic orbits, so-called limit cycles, surrounding only one equilibrium point a class of polynomial Kolmogorov systems. We denote by $\mathcal M_{K}(n)$ the maximum numb
Externí odkaz:
http://arxiv.org/abs/2304.05111
In this paper, we are concerned with studying the existence of invariant complex manifolds of two-dimensional holomorphic systems. From the geometric singular perturbation theory we know that if a slow-fast system has associated a normally hyperbolic
Externí odkaz:
http://arxiv.org/abs/2304.00142
Autor:
Gouveia, Luiz F. S., Queiroz, Lucas
We consider quadratic three-dimensional differential systems having a Hopf singular point. We study the cyclicity when the singular point is a center on the center manifold using higher order developments of the Lyapunov constants. As a result, we ma
Externí odkaz:
http://arxiv.org/abs/2110.13255
Publikováno v:
MNRAS (2020) 498 (4) 4811-4829
Context: Fast Radio Bursts are transient radio pulses from presumably compact stellar sources of extragalactic origin. With new telescopes detecting multiple events per day, statistical methods are required in order to interpret observations and make
Externí odkaz:
http://arxiv.org/abs/2008.10536
Autor:
Pacheco, Andre G. C., Lima, Gustavo R., Salomão, Amanda S., Krohling, Breno A., Biral, Igor P., de Angelo, Gabriel G., Alves Jr, Fábio C. R., Esgario, José G. M., Simora, Alana C., Castro, Pedro B. C., Rodrigues, Felipe B., Frasson, Patricia H. L., Krohling, Renato A., Knidel, Helder, Santos, Maria C. S., Santo, Rachel B. do Espírito, Macedo, Telma L. S. G., Canuto, Tania R. P., de Barros, Luíz F. S.
Over the past few years, different computer-aided diagnosis (CAD) systems have been proposed to tackle skin lesion analysis. Most of these systems work only for dermoscopy images since there is a strong lack of public clinical images archive availabl
Externí odkaz:
http://arxiv.org/abs/2007.00478
Autor:
Thiago M. Vieira, Ézio C. Santana, Luiz F. S. Souza, Renan O. Silva, Tarso V. Ferreira, Douglas B. Riffel
Publikováno v:
AIMS Energy, Vol 11, Iss 3, Pp 503-521 (2023)
The occurrence of defects in solar cells is intrinsically related to a reduction in the efficiency and reliability of these devices. Therefore, monitoring techniques, such as lock-in thermography, electroluminescence and the I-V characteristic curve
Externí odkaz:
https://doaj.org/article/12f623593a89452aa77c5f5cee39b115
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