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SPP: portable power technologies for the dismounted soldier
Sousa, Carlos; Rangel, C. M.; Rodrigues, J. Campos; Fernandes, Vitor R.; Paiva, T. I.; Soares, D. A.The project aims at the development of a portable power system as standard equipment for defence use, and is being developed by a Portuguese consortium leaded by SRE, a fuel cell developer, LNEG (Portuguese National Laboratory for Energy and Geology) and EID (Electronics and Telecommunications for Army) through a SRE/ Ministry of Defence contract. The system uses a SRE H2 PEM Fuel Cell and a Li battery buffer (...
AC electrical conductivity of Cr-doped polyaniline/poly(vinyl alcohol) blends
Soares,D.A.W.; Souza,P. H. O. de; Rubinger,R. M.; Queiroz,A.A.A. de; Higa,O.Z.; Souza,L.R. dePolyaniline (PANI) and their charge transfer complexes are engineering materials that continue to attract considerable attention from engineers due to their unique electrochemical behavior, environmental stability and high degree of processability. Extensive works on the preparation of electrically conductive PANI blends containing a polymeric matrix having desirable physical and good mechanical characteristics...
Observation of low frequency oscillations in GaAs samples grown by molecular be...
Rubinger,R. M.; Oliveira,A. G. de; Ribeiro,G. M.; Soares,D. A. W.; Moreira,M. V. B.We have observed Low Frequency Oscillations (LFO) in a GaAs sample grown by molecular beam epitaxy (MBE) at 300 °C as a function of applied electric field, temperature and illumination intensity. Time series of the oscillations for different values of the applied electric field at room temperature were obtained. We have also obtained the jxE characteristics as a function of temperature and light intensity. We w...
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