Revista elektron

1-7

Authors: Juan Carlos Agotegaray, Andrea Pinzón, Emanuel Lera

This paper presents the development of an automated electric generators test bench for low power wind energy in urban applications. The bench allows testing electric generator under similar operating conditions to real, electric generator coupled to a wind turbine in urban environments, which allows to determine specific parameters: electric current, voltage, power.

14-20

Authors: Rosa Marina Corti, Javier Belmonte, Néstor Marcón, Marcelo Pistarelli, Roberto Martínez, Juan Pablo Vecchio

Traditional wireless sensor networks work with scalar data like temperature o humidity because they have strong restrictions on bandwidth and energy consumption. Nevertheless, in recent years, technological advances have permitted a significant growth in the use of these networks for processing and transmitting complex signals like audio, video or vibrations. This work reports the development of an adaptable platform for sensor nodes, which are able to measure, process, store and wirelessly transmit diverse physical variables. The design of these nodes allows the adaptation of them for the use in applications that require to measure and process signals of varied complexity. In addition, the nodes permit the wireless transmission of the information obtained from the local processing of the signals mentioned above. Finally, the adaptation of the platform to measure vibration in road bridges is described as a case study.

27-34

Authors: Federico Luna, Silvina Boggi, Walter Gustavo Fano

Metamaterials in microwave frequency bands have been widely explored in the development and design of antenna structures and arrays. In this paper, the so-called Yang cell have been studied. When these cells are periodically arranged on a plane, the resulting metamaterial structure shows lower band-gap frequencies than structures composed of other unit cells of the same size. The electric and magnetic fields in the first two modes of electromagnetic propagation in the unit cell have been studied. Four equivalent circuit models of the unit cell have been developed in order to easily and quickly obtain the frequency response of the metamaterial structure. These models are explained in this paper, and were validated using full-wave computational electromagnetic methods.