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Limit cycles via higher order perturbations for some piecewise differential systems
(Elsevier B.V., 2018-05-15)
A classical perturbation problem is the polynomial perturbation of the harmonic oscillator, (x', y') = (-y + epsilon f(x, y, epsilon), x + epsilon g(x, y, epsilon)). In this paper we study the limit cycles that bifurcate ...
Spanning Trees With Nonseparating Paths
(ELSEVIER SCIENCE BVAMSTERDAM, 2016)
Synthesis and characterization of montmorillonite/polyaniline composites and its usage to modify a commercial separator
(Elsevier Science SA, 2021-01)
Composites of montmorillonite (MMT) and polyaniline (PANI) were synthetized through a facile and inexpensive method. Two samples with different MMT:PANI ratios were studied and deeply characterized by XRD, TG, zeta potential, ...
Effects of LHRH on avoidance conditioning in normally cycling and ovariectomized female rats
(1998)
Several studies have demonstrated that the peptide LHRH can modify behavior in the male rat. Peripheral and intracerebral infusions of LHRH impair the acquisition of conditioned avoidance responses (CARs) and increase some ...
Geomagnetic storm occurrence and their relation with solar cycle phases
(Amer Geophysical Union, 2021)
Using a time series of geomagnetic storm events between 1957 and 2019, obtained by selecting storms where Dst<-50 nT, we have analyzed the probability of occurrence of moderate, intense, and severe events. Considering that ...
Piecewise linear perturbations of a linear center
(2013-09-01)
This paper is mainly devoted to the study of the limit cycles that can bifurcate from a linear center using a piecewise linear perturbation in two zones. We consider the case when the two zones are separated by a straight ...
Piecewise linear perturbations of a linear center
(2013-09-01)
This paper is mainly devoted to the study of the limit cycles that can bifurcate from a linear center using a piecewise linear perturbation in two zones. We consider the case when the two zones are separated by a straight ...
Influence of endogenous and synthetic female sex hormones on human blood cells in vitro studied with comet assay
(2007-08-01)
The comet assay has been conducted with numerous cell lines to assess in vitro genotoxicity. In order to use the comet assay as part of an in vitro test for evaluating genotoxicity, however, there are cell-specific factors ...
Influence of endogenous and synthetic female sex hormones on human blood cells in vitro studied with comet assay
(2007-08-01)
The comet assay has been conducted with numerous cell lines to assess in vitro genotoxicity. In order to use the comet assay as part of an in vitro test for evaluating genotoxicity, however, there are cell-specific factors ...