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Search Results: 1 - 10 of 717899 matches for " C.R. Maga?a-Zavala "
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Estudio del comportamiento ante la corrosión de películas delgadas de Ni y óxido de Ni obtenidas por espurreo catódico frente a un medio amargo
C.R. Magaa-Zavala,F.J. Rodríguez-Gómez,D.R. Acosta,R. ávila-Godoy
Revista mexicana de física , 2005,
Abstract: En este trabajo se presenta el estudio del comportamiento de pel′ culas delgadas de n′ quel y un ′oxido superior de n′ quel obtenidas por espurreo cat′odico sobre acero AISI 1018 (UNS G 10180), con el prop′osito de disminuir la velocidad de corrosi′on del acero al carbono cuando se expone a un medio amargo (presencia de ′acido sulfh′ drico y cloruros) y alargar la vida ′util de las estructuras petroqu′ micas met′alicas, con lo que se ahorrar′ a una importante cantidad de recursos monetarios y humanos. La caracterizaci ′on de las superficies se realiz′o utilizando las t′ecnicas electroqu′ micas[1] (curvas de polarizaci′on y espectroscopia de impedancia electroqu′ mica).
Estudio del comportamiento de películas delgadas de Ni y óxido de Ni obtenidas por espurreo catódico frente a un medio amargo
C.R. Magaa-Zavala,F.J. Rodríguez-Gómez,D.R. Acosta,J. Genescá
Revista mexicana de física , 2006,
Abstract: The aim of this work is to study the behavior of nickel and nickel oxide thin films obtained by cathodic sputtering on steel AISI 1018 (UNS G 10180), with the purpose of diminishing the corrosion rate of low carbon steel, when it is exposed to a sour medium, and to obtain an efficient anticorrosive protection. The characterization of the surfaces was carried out by electrochemical techniques, such polarization curves and electrochemical impedance spectroscopy.
Estudio del comportamiento de películas delgadas de Ni y óxido de Ni obtenidas por espurreo catódico frente a un medio amargo
C. R. Magaa-Zavala,F. J. Rodríguez-Gómez,D. R. Acosta,J. Genescá
Revista mexicana de física , 2006,
Abstract: En este trabajo se presenta el estudio del comportamiento de películas delgadas de níquel y un óxido superior de níquel obtenidas por espurreo catódico sobre acero AISI 1018 (UNS G 10180), con el propósito de disminuir la velocidad de corrosión del acero al carbón cuando se expone a un medio amargo (presencia de ácido sulfhídrico y cloruros) y obtener una protección anticorrosiva eficaz. La caracterización de las superficies se realizó a través de técnicas electroquímicas[l] (curvas de polarización y espectroscopia de impedancia electroquímica).
Estudio del comportamiento de películas delgadas de Ni y óxido de Ni obtenidas por espurreo catódico frente a un medio amargo
Magaa-Zavala, C. R;Rodríguez-Gómez, F. J;Acosta, D. R;Genescá, J;ávila-Godoy, R;
Revista mexicana de física , 2006,
Abstract: the aim of this work is to study the behavior of nickel and nickel oxide thin films obtained by cathodic sputtering on steel aisi 1018 (uns g 10180), with the purpose of diminishing the corrosion rate of low carbon steel, when it is exposed to a sour medium, and to obtain an efficient anticorrosive protection. the characterization of the surfaces was carried out by electrochemical techniques, such polarization curves and electrochemical impedance spectroscopy.
Robot Motion Planning using Hyperboloid Potential Functions
A. Badawy,C.R. McInnes
Lecture Notes in Engineering and Computer Science , 2007,
Abstract:
Prediction of condensation in caves Speleogenesis and Evolution of Karst Aquifers
DeFreitas,C.R.;Schmekal,A.
Speleogenesis and Evolution of Karst Aquifers , 2005,
Abstract: Condensation is an important process in karst environments, especially in caves where carbon dioxide enriched air can lead to high rates of condensation corrosion. The problem is there has been very little research reported in the literature dealing with condensation as a microclimate process. This study addresses the problem and reports on a method for measuring and predicting condensation rates in a limestone cave. Electronic sensors for measuring condensation and evaporation of the condensate as part of a single continuous process of water vapour flux are tested and used to collect 12 months of data. The study site is the Glowworm tourist cave in New Zealand. Condensation is a function of the vapour gradient between rock surfaces in the cave and cave air. The size of the gradient is largely determined by air exchange with the outside. The results show that the numerical model to predict condensation works well. Given that rock-surface temperature in the cave does not vary much, condensation is essentially a function of cave air temperature and the processes that affect it, mainly, air exchange with outside. The results show that condensation can be controlled by controlling ventilation of the cave.
The Effect of Compression Ring Profile on the Friction Force in an Internal Combustion Engine
A. Sonthalia,C.R. Kumar
Tribology in Industry , 2013,
Abstract: In an internal combustion engine piston, piston ring and cylinder are the most important assembly for transmitting the forces produced by the combustion process. The friction between piston ring pack and cylinder accounts for major portion of friction in an internal combustion engine and it also significantly affects the mechanical efficiency of the engine. In the piston ring pack, friction is mainly due to the compression ring, especially at the top dead centre and bottom dead centre where boundary lubrication exists. This paper provides a detailed study on the effect of ring profile on ring friction using MATLAB code. Three different ring profiles were selected and analysed for lubricant film thickness, ring twist angle, ring friction and friction coefficient. Out of these three, friction force and friction coefficient of one ring profile design was found minimum. The ring design with minimum friction force and friction coefficient was manufactured and assembled in a low speed SI engine. The engine liner was modified to float and friction of the ring was studied using motoring test method. The experimental results were compared with the simulation result, it was found that simulation result was in agreement with the experimental result.
Preliminary Meteorological Results of a Four-Dimensional Data Assimilation Technique in Southern Italy  [PDF]
Elenio Avolio, S. Federico, A.M Sempreviva, C.R Calidonna, L. De Leo, C Bellecci
Atmospheric and Climate Sciences (ACS) , 2011, DOI: 10.4236/acs.2011.13015
Abstract: A four-dimensional data assimilation (FDDA) scheme based on a Newtonian relaxation (or “nudging”) was tested using observational asynoptic data collected at a coastal site in the Central Mediterranean peninsula of Calabria, southern Italy. The study is referred to an experimental campaign carried out in summer 2008. For this period a wind profiler, a sodar and two surface meteorological stations were considered. The collected measurements were used for the FDDA scheme, and the technique was incorporated into a tailored version of the Regional Atmospheric Modeling System (RAMS). All instruments are installed and operated routinely at the experimental field of the CRATI-ISAC/CNR located at 600 m from the Tyrrhenian coastline. Several simulations were performed, and the results show that the assimilation of wind and/or temperature data, both throughout the simulation time (continuous FDDA) and for a 12 h time window (forecasting configuration), produces improvements of the model performance. Considering a whole single day, improvements are sub-stantial in the case of continuous FDDA while they are smaller in the case of forecasting configuration. En-hancements, during the first six hours of each run, are generally higher. The resulting meteorological fields are finalised as input into air quality and agro-meteorological models, for short-term predictions of renew-able energy production forecast, and for atmospheric model initialization.
Eclectic Genetic Algorithm for Holistic Face Recognition in L_infinite Space
C. Villegas,J. Climent,C.R. Murillo,A. Otero
Lecture Notes in Engineering and Computer Science , 2011,
Abstract:
Adjuvantes e herbicidas e a infectividade de Fusarium graminearum, agente potencial de biocontrole de Egeria densa e Egeria najas
Borges Neto, C.R.;Pitelli, R.A.;
Planta Daninha , 2004, DOI: 10.1590/S0100-83582004000100010
Abstract: the effects of adding adjuvants and their association with herbicides on fungus infectivity were studied in the fusariumgraminearum x egeria spp. pathosystem. healthy egeriadensa and e. naja plants were inoculated with suspension of ground rice with f. graminearum, at a concentration of 0.7 g l-1. the assay tubes with the plants immersed in the suspension were kept in the incubator at the temperature of 25 oc and photoperiod of 12 hours daily, with plant symptoms being evaluated every two hours and plant growth monitored based on fresh matter increase at the end of the experiment. the effect of 14 adjuvants and 6 herbicides added to the inoculum on the action of f. graminearum against e. densa and e. najas was evaluated. in general, the adjuvants improved bioherbicide efficiency and the herbicide + fungus association increased disease severity and plant growth control.
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