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Effect of aeration on Tafelian behavior of the carbon steel corrosion in acid sulfate medium

Abstract: This study presents a corrosion analysis of carbon steel by electrochemical polarization tests on a rotating disk electrode at several aeration and hydrodynamic conditions in solution 0.2 mol L-1 K2SO4 at pH 3. The reactions involved in the dissolution of the

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EIS, Mott Schottky and EFM analysis of the electrochemical stability and dielectric properties of Ca-P-Ag and Ca-P-Si-Ag coatings obtained by plasma electrolytic oxidation in Ti6Al4V

Abstract: Ti6Al4V ELI (ASTM F136) alloy is one of the most used alloys in devices for osteosynthesis and joint replacement. However, the properties of this alloy can be improved regarding biocompatibility and the osteointegration with the bone tissue through coatings.

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Study of the visible light activity of Pt and Au-TiO2 photocatalysts in organic pollutants degradation

Abstract: Pt-TiO2 and Au-TiO2 photocatalysts were prepared by noble metal photodeposition on sulfated TiO2. It was observed that optical absorption, oxidation state and particle size of the metallic species (Pt or Au) play an important role in the TiO2 photocatalytic a

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Iron based coatings deposited by arc thermal spray

Abstract: In this paper, the results of wear resistance and hardness of iron alloy coatings applied by the method of arc thermal spray on substrates of steel AISI-SAE 4340 at room temperature, are presented. The coatings were performed using three different types of wi

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Structural and vibrational studies on composites polymer electrolytes (PEO)10CF3COONa + x wt.% Al2O3

Abstract: Composites formed by combinations of polyethylene oxide (PEO) and sodium trifluoroacetate (CF3COONa) with different aluminum oxide (Al2O3) concentrations were synthetized. Infrared (IR), Raman spectroscopy, X ray diffraction (XRD) and atomic force microscopy

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Recycling rotating electrical machines

Abstract: This paper establishes design principles for rotating recyclable electrical machines (synchronous and induction), in other words electrical machines and machine components may be reused. Also, technological issues arising from following machine components are

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Experimental study of flat plate cooling using draft induced by a submerged radial jet

Abstract: An experimental research has been conducted for evaluating heat transfer in a modified configuration of a submerged radial jet, so it was possible to extract the fluid directly under the nozzle, looking for an improvement in the heat transfer rate. The experi

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A simple geomagnetic field compensation system for uniform magnetic field applications

Abstract: In this paper a simple geomagnetic field compensation system for uniform magnetic field applications of low magnitude and frequency is presented. The compensation system is based on an array of Tri-axial Square Helmholtz (TSH) coils, an array of tri-axial Hal

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An algorithm for learning sparsifying transforms of multidimensional signals

Abstract: Multidimensional signals contain information of an object in more than one dimension, and usually their processing relies on complex methods in comparison with their unidimensional counterparts. In signal processing, finding a sparse representation of a signa

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New methodology for calibration of hydrodynamic models in curved open-channel flow

Abstract: This paper evaluates a new methodology for calibration of hydrodynamic models based on the theory of statistical design of experiments. An Eulerian-Eulerian hydrodynamic homogeneous model, integrated by the commercial software CFX Ansys Inc., is used to perfo

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Architectural capability analysis using a model-checking technique

Abstract: This paper describes a mathematical approach based on a model-checking technique to analyze capabilities in enterprise architectures developed by using DoDAF and TOGAF architecture frameworks. Such approach base is the requirements’ validation related to the

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