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- Universidade Federal Rural de PernambucoBR26 papers
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12 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…
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…
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…