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This paper describes an MOS transistor-based transducer used for measuring magnetic fields. The setup, the electric/magnetic characterization, and an equivalent circuit for transistor level simulations are presented. The sensor (also called MAGFET), designed in a 1.5 µm CMOS process, presents…

Two species of Loneura, one from Nicaragua and the other from Venezuela, are described and illustrated.They constitute a pair of sister species, based on characters of the compound eyes, forewing pterostigma and patternof pigmentation, and structure of male phallosome and…

To avoid risky and expensive chemical immobilization of otariid pups, physical restriction is a better option. For this reason we constructed a stretcher that permits wide liberty to interact with the pup and take a variety of samples in a…

The mathematical model of a two-dimensional self-gravitating cluster formed by degenerate fermions, is solved analytically. The fermions interact with each other through a logarithmic potential. The radius of this system is shown to be constant, not depending on the total…

In this paper we present a very simple derivation of the constants of motion for dynamical systems, which requires only an elementary knowledge of the theory of continuous groups. In addition, through the infinitesimal Lorenz transformations group, we obtain a…

A mathematical model of a nonlinear electronic circuit, which is the core of the electronic chaotic oscillator, is presented. This mathematical model or nonlinear function has a direct relationship with the values of the components used to build an experimental…

This work presents an overview of a methodology based on the Numerical Laplace Transform (NLT) and applied to the analysis of electromagnetic transient phenomena in power systems. The basic development of the method is described, with its main qualitative advantages…

In this work a new method for measuring the speed of sound in materials is reported. This method uses the photoacoustic effect, which is the generation of sound waves by pulsed optical radiation incident on a material sample. The sound…

This paper focuses on the asymptotic stability of proportional-integral AQM controllers supporting TCP flows. Necessary and sufficient conditions for the asymptotic stability of the closed-loop linearization are provided. As a result, the complete set of proportional-integral controllers that locally stabilizes…