840 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Universidade Federal Rural de PernambucoBR89 papers
- Universidade Federal da ParaíbaBR67 papers
- Universidade Federal de AlagoasBR44 papers
- Universidade Federal de Santa MariaBR41 papers
- Universidade de São PauloBR37 papers
- Centre National de la Recherche ScientifiqueFR34 papers
- University of CalgaryCA31 papers
- Universidade de PernambucoBR26 papers
- University of AkronUS21 papers
- Universidade Federal do Rio Grande do NorteBR19 papers
- École de Technologie SupérieureCA17 papers
- Universidade Estadual de Campinas (UNICAMP)BR17 papers
25 papers · 1 filter
A new class of fatigue life distributions
Marcelo Bourguignon, Rodrigo B. Silva, Gauss M. Cordeiro
In this paper, we introduce the Birnbaum-Saunders power series class of distributions which is obtained by compounding Birnbaum-Saunders and power series distributions. The new cla…
Holography as Cutoff: a proposal for measure of inflationary universes
Fábio Novaes, Bruno Carneiro da Cunha
We propose the holographic principle as a dynamical cutoff for any quantum theory of gravity with a geometric description at low energies, incorporating ideas of effective field th…
Spinors and the Weyl Tensor Classification in Six Dimensions
Carlos Batista, Bruno Carneiro da Cunha
A spinorial approach to 6-dimensional differential geometry is constructed and used to analyze tensor fields of low rank, with special attention to the Weyl tensor. We perform a st…
Entropy-based Statistical Analysis of PolSAR Data
Alejandro C. Frery, Renato J. Cintra, Abraão D. C. Nascimento
Images obtained from coherent illumination processes are contaminated with speckle noise, with polarimetric synthetic aperture radar (PolSAR) imagery as a prominent example. With a…
The Fantastic Four: A plug 'n' play set of optimal control pulses for enhancing nmr spectroscopy
Manoj Nimbalkar, Burkhard Luy, Thomas E. Skinner +5
We present highly robust, optimal control-based shaped pulses designed to replace all 90° and 180° hard pulses in a given pulse sequence for improved performance. Special attention…
Vortex motion around a circular cylinder
G. L. Vasconcelos, M. N. Moura, A. M. J. Schakel
The motion of a pair of counter-rotating point vortices placed in a uniform flow around a circular cylinder forms a rich nonlinear system that is often used to model vortex sheddin…
Four-vortex motion around a circular cylinder
M. N. Moura, G. L. Vasconcelos
The motion of two pairs of counter-rotating point vortices placed in a uniform flow past a circular cylinder is studied analytically and numerically. When the dynamics is restricte…
Homology of Homogeneous Divisors
Aron Simis, Stefan O. Tohaneanu
One deals with arbitrary reduced free divisors in a polynomial ring over a field of characteristic zero, by stressing the ideal theoretic and homological behavior of the correspond…
Quantum phase transitions in alternating spin-(1/2, 5/2) Heisenberg chains
A. S. F. Tenório, R. R. Montenegro-Filho, M. D. Coutinho-Filho
The ground state spin-wave excitations and thermodynamic properties of two types of ferrimagnetic chains are investigated: the alternating spin-1/2 spin-5/2 chain and a similar cha…
Two-photon transitions driven by a combination of diode and femtosecond lasers
Marco P. Moreno, Giovana T. Nogueira, Daniel Felinto +1
We report on the combined action of a cw diode laser and a train of ultrashort pulses when each of them drives one step of the 5S-5P-5D two-photon transition in rubidium vapor. The…
Hypothesis Testing in Speckled Data with Stochastic Distances
Abraão D. C. Nascimento, Renato J. Cintra, Alejandro C. Frery
Images obtained with coherent illumination, as is the case of sonar, ultrasound-B, laser and Synthetic Aperture Radar -- SAR, are affected by speckle noise which reduces the abilit…
Parametric and Nonparametric Tests for Speckled Imagery
Renato J. Cintra, Abraão D. C. Nascimento, Alejandro C. Frery
Synthetic aperture radar (SAR) has a pivotal role as a remote imaging method. Obtained by means of coherent illumination, SAR images are contaminated with speckle noise. The statis…
Nonparametric Edge Detection in Speckled Imagery
Edwin Girón, Alejandro C. Frery, Francisco Cribari-Neto
We address the issue of edge detection in Synthetic Aperture Radar imagery. In particular, we propose nonparametric methods for edge detection, and numerically compare them to an a…
Symmetry, bifurcation and stacking of the central configurations of the planar 1+4 body problem
Allyson Oliveira
In this work we are interested in the central configurations of the planar 1+4 body problem where the satellites have different infinitesimal masses and two of them are diametrical…
Local mapping of dissipative vortex motion
B. Raes, J. Van de Vondel, A. V. Silhanek +4
We explore, with unprecedented single vortex resolution, the dissipation and motion of vortices in a superconducting ribbon under the influence of an external alternating magnetic…
Grey-box GUI Testing: Efficient Generation of Event Sequences
Stephan Arlt, Ishan Banerjee, Cristiano Bertolini +2
Graphical user interfaces (GUIs), due to their event driven nature, present a potentially unbounded space of all possible ways to interact with software. During testing it becomes…
Comment on "Trouble with the Lorentz Law of Force: Incompatibility with Special Relativity and Momentum Conservation"
Pablo L. Saldanha
We present a solution for the apparent paradox regarding an incompatibility between the Lorentz force law and special relativity presented by Mansuripur [Phys. Rev. Lett. 108, 1939…
A Generalization of the Goldberg-Sachs Theorem and its Consequences
Carlos Batista
The Goldberg-Sachs theorem is generalized for all four-dimensional manifolds endowed with torsion-free connection compatible with the metric, the treatment includes all signatures…
Stability of fractional vortex states in a two-band mesoscopic superconductor
Juan C. Pina, Clecio C. de Souza Silva, Milorad V. Milosevic
We investigate the stability of noncomposite fractional vortex states in a mesoscopic two-band superconductor within the two-component Ginzburg-Landau model. Our analysis explicitl…
Effective masses and complex dielectric function of cubic HfO2
Joelson Cott Garcia, L. M. R. Scolfaro, J. R. Leite +4
The electronic band structure of cubic HfO2 is calculated using an it ab initio all-electron self--consistent linear augmented plane-wave method, within the framework of the local-…
Structural, electronic, and optical properties of ZrO2 from ab initio calculations
Joelson Cott Garcia, L. M. R. Scolfaro, A. T. Lino +6
Structural, electronic, and optical properties for the cubic, tetragonal, and monoclinic crystalline phases of ZrO2, as derived from it ab initio full-relativistic calculations, ar…
Weyl Tensor Classification in Four-dimensional Manifolds of All Signatures
Carlos Batista
It is well known that the classification of the Weyl tensor in Lorentzian manifolds of dimension four, the so called Petrov classification, was a great tool to the development of g…
A decomposition theorem for binary matroids with no prism minor
Sandra Kingan, Manoel Lemos
The prism graph is the dual of the complete graph on five vertices with an edge deleted, . In this paper we determine the class of binary matroids with no prism mi…
CLEVER: Clique-Enumerating Variant Finder
Tobias Marschall, Ivan Costa, Stefan Canzar +4
Next-generation sequencing techniques have facilitated a large scale analysis of human genetic variation. Despite the advances in sequencing speeds, the computational discovery of…