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Amezquita-Brooks L.,Research Center e Innovacion en Ingenieria Aeronautica | Martinez-Vazquez D.L.,Research Center e Innovacion en Ingenieria Aeronautica
Proceedings - 2014 IEEE International Conference on Mechatronics, Electronics, and Automotive Engineering, ICMEAE 2014 | Year: 2014

The use of low-cost digital processing platforms for small and micro unmanned aerial vehicles (UAV) has gained recent attention by the research and education communities. In particular, the development of novel real-time control schemes for small and micro UAVs has specific requirements which have to be directly addressed in order to warrant the vehicle integrity. In this article the evaluation and comparison of two popular low-cost digital processing platforms is presented. The comparison is made through the measurement of the real-world capabilities of each platform, evaluating the time consumed in the development and implementation of new algorithms using these platforms. © 2014 IEEE. Source


Cabral-Miramontes J.A.,Research Center e Innovacion en Ingenieria Aeronautica | Gaona-Tiburcio C.,Research Center e Innovacion en Ingenieria Aeronautica | Almeraya-Calderon F.,Research Center e Innovacion en Ingenieria Aeronautica | Estupinan-Lopez F.H.,Research Center e Innovacion en Ingenieria Aeronautica | Pedraza-Basulto G.K.,Research Center e Innovacion en Ingenieria Aeronautica
International Journal of Corrosion | Year: 2014

The thermal spraying process is a surface treatment which does not adversely affect the base metal on which it is performed. The coatings obtained by HVOF thermal spray are employed in aeronautics, aerospace, and power generation industries. Alloys and coatings designed to resist oxidizing environments at high temperatures should be able to develop a surface oxide layer, which is thermodynamically stable, slowly growing, and adherent. MCrAlY type (M = Co, Ni or combination of both) coatings are used in wear and corrosion applications but also provide protection against high temperature oxidation and corrosion attack in molten salts. In this investigation, CoNiCrAlY coatings were produced employing a HVOF DJH 2700 gun. The work presented here focuses on the influences of process parameters of a gas-drive HVOF system on the microstructure, adherence, wear, and oxygen content of CoNiCrAlY. The results showed that spray distance significantly affects the properties of CoNiCrAlY coatings. © 2014 J. A. Cabral-Miramontes et al. Source


Rodriguez Vela D.L.,Autonomous University of Nuevo Leon | Krishnan B.,Autonomous University of Nuevo Leon | Aguilar Martinez J.A.,Autonomous University of Nuevo Leon | Aguilar Martinez J.A.,Research Center e Innovacion en Ingenieria Aeronautica | And 2 more authors.
Physica Status Solidi (C) Current Topics in Solid State Physics | Year: 2016

Silver antimony sulfoselenide thin films have been investigated for photovoltaic applications. In the present work, we report preparation of AgSb(SxSe1-x)2 by a rapid thermal processing of pre-annealed Sb2S3/Ag/Se/Ag/Se layered structures. Sb2S3thin films were deposited by chemical bath deposition and Ag by thermal evaporation. Silver (Sb2S3/Ag) layered precursors were dipped in Na2SeSO3 solution followed by annealing and then rapid thermal processing. Also, photovoltaic structures were prepared using AgSb(SxSe1-x)2 thin films as absorber and CdS as window material. The effects of rapid thermal processing on the structure, morphology and properties of these thin films were studied. Characterization of the absorber materials was done using X-ray diffraction, X-ray photoelectron spectroscopy, Atomic force microscopy, Optical absorption spectroscopy and Current-voltage characteristics. Analysis of J -V characteristics of the photovoltaic structures under AM1.5 illumination before and after rapid thermal treatment showed Voc in a range of 457 to 473 mV and Jsc of 5.8 to 7.2 mA/cm2. 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Mendivil M.I.,Autonomous University of Nuevo Leon | Garcia L.V.,Autonomous University of Nuevo Leon | Krishnan B.,Autonomous University of Nuevo Leon | Avellaneda D.,Autonomous University of Nuevo Leon | And 3 more authors.
Materials Research Bulletin | Year: 2015

Pulsed laser ablation in liquid medium (PLALM) is a nanofabrication technique to produce complex nanostructures. CuInGaSe2 (CIGS) is an alloy with applications in photovoltaic industry. In this work, we studied the effects of laser ablation wavelength, energy fluence and liquid medium on the properties of the CIGS nanoparticles synthesized by PLALM. The nanoparticles obtained were analyzed by transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX), selected area electron diffraction (SAED), X-ray photoelectron spectroscopy (XPS) and UV-vis absorption spectroscopy. XPS results confirmed the chemical states and composition of the ablated products. TEM analysis showed different morphologies for the nanomaterials obtained in different liquid media and ablation wavelengths. The optical properties for these CIGS nanocolloids were analyzed using UV-vis absorption spectroscopy. The results demonstrated the use of PLALM as a useful synthesis technique for nanoparticles of quaternary photovoltaic materials. © 2015 Elsevier Ltd. All rights reserved. Source


Garcia L.V.,Autonomous University of Nuevo Leon | Loredo S.L.,Autonomous University of Nuevo Leon | Shaji S.,Autonomous University of Nuevo Leon | Aguilar Martinez J.A.,Autonomous University of Nuevo Leon | And 4 more authors.
Materials Research Bulletin | Year: 2016

Cadmium sulphide (CdS) is a well known n-type semiconductor having suitable optoelectronic properties for solar cell applications. In the present work, we report the preparation and characterization of CdS thin films by pulsed laser assisted chemical bath deposition (PLACBD). CdS thin films were synthesized from a chemical bath containing cadmium chloride, triethanolamine, ammonium hydroxide and thiourea at different conditions. The thin films were prepared by in situ irradiation of the chemical bath using a Q-switched Nd:YAG laser with two different output wavelengths (532 nm and 1064 nm). The thin films deposited for 10, 15 and 20 min were characterized by X-ray diffractometry (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), Atomic force microscopy (AFM), UV–vis absorption spectroscopy and photoconductivity measurements. Our results showed that in-situ irradiation of the chemical bath using pulsed laser resulted accelerated growth of the CdS thin films. © 2016 Elsevier Ltd Source

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