Ciencia Tecnologia y Futuro最新文献

{"title":"POSSIBILITIES OF CORROSION ASSESSMENT OF METALS IN BIODIESEL USING EIS","authors":"J. Calderon, L. Baena, J. Lenis","doi":"10.29047/01225383.43","DOIUrl":"https://doi.org/10.29047/01225383.43","url":null,"abstract":"-2 ) to be associated with a metal double layer capacitance, the values of these capacitances increased with the increment of the exposition time. It is pos- sible that for longer times of exposition, the electrochemical parameter related with the lowest capacitive loop of the impedance can be associated to the metal corrosion phenomena. ABSTRACT","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79073800","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Behavior of aluminium coating by CVD-FBR in steam oxidation at 700°C","authors":"J. L. M. Arévalo, F. Trujillo, Saul Castañeda Quintana","doi":"10.29047/01225383.42","DOIUrl":"https://doi.org/10.29047/01225383.42","url":null,"abstract":"espanolSe han obtenido recubrimientos de aluminio por la tecnica de deposicion quimica de vapor por lecho fluidizado (CVD-FBR de sus siglas en ingles), sobre aceros inoxidables austeniticos (AISI 304, AISI 316 y AISI 317), con el proposito de evaluar la resistencia a la oxidacion en vapor de agua a 700oC. Los recubrimientos fueron caracterizados en su morfologia/composicion y fases cristalinas mediante las tecnicas de Microscopia Electronica de Barrido (MEB), con analisis de rayos X por dispersion de energia (EDAX de sus siglas en ingles) y Difraccion de Rayos X (DRX). Ademas, se realizo simulacion termodinamica mediante el software comercial Thermo-Calc®, con la finalidad de aproximar a las condiciones optimas la deposicion del recubrimiento sobre los mencionados aceros. Todos los especimenes sin y con recubrimiento de aluminio por CVD-FBR, fueron oxidados a la temperatura de 700oC, en una atmosfera proxima al 100% de vapor de agua por 1000 h. El recubrimiento de aluminio evito la formacion de islas o costra de oxidos y disminuyo la ganancia de masa de los aceros. El acero AISI 304 con recubrimiento presento una reduccion del 25% en la ganancia de masa en comparacion con el mismo acero sin recubrimiento y oxidado en las mismas condiciones; los aceros AISI 316 y AISI 317 presentaron perdida de masa, debido a que el oxido formado se desprende por su naturaleza quebradiza. EnglishAluminum coatings have been obtained using the Chemical Vapor Deposition of Fluidized Bed Reactor technique (CVD-FBR), on austenitic stainless steels (AISI 304, AISI 316 and AISI 317), in order to evaluate resistance to steam oxidation at 700oC. The coatings were characterized in their morphology/composition and crystalline phases using Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Analysis (EDAX) and X-ray Diffraction (XRD). In addition, thermodynamic simulation was performed using Thermo-Calc® software to make the deposition of the coating on said steels similar to optimal conditions. All specimens -with and without aluminum coating by CVD-FBR- were oxidized at 700oC, in a steam atmosphere of nearly 100% for 1000 h. The aluminum coating prevented the formation of oxide islands or crust, and reduced steel mass gain. Coated AISI steel showed a 25% reduction in mass gain compared to the same steel uncoated and oxidized under the same conditions. AISI 316 and AISI 317 steels underwent loss of mass because the brittle oxide that was formed came loose. portuguesForam obtidos recobrimentos de aluminio pela tecnica de deposicao quimica de vapor por leito fluidizado (CVD-FBR por suas siglas em ingles), sobre acos inoxidaveis austeniticos (AISI 304, AISI 316 e AISI 317), com o proposito de avaliar a resistencia a oxidacao em vapor d’agua a 700oC. Os recobrimentos foram caracterizados em sua morfologia/composicao e fases cristalinas mediante as tecnicas de Microscopia Eletronica de Varredura (MEB), com analise de raios X por dispersao de energia (EDAX por suas siglas ","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76956772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"New models to predict the viscosity of extra-heavy oil in colombian fields","authors":"Mauricio Pertuz-Parra, Gian Pino-Tarazona, John-Alexander León-Pabón, C. Pérez-Reyes, Carlos-Andrés Díaz-Prada","doi":"10.29047/01225383.38","DOIUrl":"https://doi.org/10.29047/01225383.38","url":null,"abstract":"Viscosity is one of the fundamental properties of fluids in calculating the pressure drop of fluid flow through pipes or porous media. It is also highly relevant in interpreting production tests, hydrocarbon transport and the analysis of problems that may arise in the well. This paper introduces an adjustment to the De Ghetto viscosity model in order to accurately predict the viscosity of undersaturated extra-heavy oil. The adjustment of the De Ghetto model for undersaturated extra-heavy oil has been developed using a database of PVT analysis of extra-heavy oil to assess the accuracy of the models published in literature. Subsequently, by using statistical analysis and regression techniques, the models with the best approximation to the values of the PVT reports were adjusted, thus resulting in two models with absolute average error rates of 4.69 and 2.42%. These rates are valid for oils with API gravities ranging from 6.5 to 9.5, in order to accurately predict the viscosity of undersaturated extra-heavy oils.","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80423462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"1 H- AND 13 C-NMR STRUCTURAL CHARACTERIZATION OF ASPHALTENES FROM VACUUM RESIDUA MODIFIED BY THERMAL CRACKING","authors":"J. Poveda, D. Molina, Edgar-Francisco Pantoja-Agreda","doi":"10.29047/01225383.40","DOIUrl":"https://doi.org/10.29047/01225383.40","url":null,"abstract":"Resumen en: 1H- and 13C-NMR data were used to characterize asphaltenes and to follow their chemical changes when they were exposed to thermal cracking under differen...","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76782271","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"KINETIC PARAMETERS DETERMINATION OF FCC GASOLINE HYDROTREATING USING GENETIC ALGORITHMS","authors":"C. M. Celis-Cornejo, Gustavo-Alberto Granados-Zarta, Carlos-Eduardo Bravo-Villarreal, David J. Pérez-Martínez, S. Giraldo-Duarte","doi":"10.29047/01225383.49","DOIUrl":"https://doi.org/10.29047/01225383.49","url":null,"abstract":"The kinetics parameters for the simultaneous reactions of hydrodesulfurization and hydrogenation of\u0000synthetic Fluid Catalytic Cracking (FCC) naphtha over CoMo/a-Al2O3 catalyst were determined. The\u0000proposed kinetic model considered a Langmuir-Hinshelwood adsorption mechanism (with 16 steps)\u0000with just one kind of active site. The amount of experimental data obtained was relatively limited, thus a\u0000genetic algorithm accompanied by an optimization through the Nelder-Mead Simplex method were used for\u0000the parameter estimations. Trimethylpentenes and 2-methylthiophene were used as representative molecules\u0000of unsaturated and sulfur compounds in FCC naphtha respectively. It was possible to calculate kinetic and\u0000thermochemical parameters, such as activation energies, adsorption heats and frequency factors with a\u0000good enough approach. This methodology results very useful since it allows the parameters determination\u0000with accuracy, reducing the amount of experimentation in comparison with traditional methodologies.","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87527769","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"UNSTEADY NUMERICAL SIMULATION OF DYNAMIC REACTOR - EVAPORATOR INTERACTION IN THERMOCHEMICAL REFRIGERATION SYSTEMS","authors":"J. Mejía, F. Chejne, F. Cortés","doi":"10.29047/01225383.51","DOIUrl":"https://doi.org/10.29047/01225383.51","url":null,"abstract":"Close interaction between evaporation/reaction rates in gas-solid refrigeration cycles promotes the \u0000dynamic behavior of gas pressure in gas-liquid and gas-solid interfaces in evaporators and reactor \u0000diffusers. Simultaneously, gas pressure modifies both reaction rates in reactors and mass and energy \u0000transfer rates in reactors and evaporators. The objective of this work is to model the complex interaction between \u0000reactor and evaporator using a phenomenological approach. The coupled interaction is studied by a \u0000novel mathematical model of the reactor and evaporator at the synthesis/evaporation step. The model of the \u0000gas-solid reactor is based on unsteady 2-D mass, momentum and energy transport equations. The evaporator \u0000model considers the interaction between evaporation/reaction rates given by the unsteady mass and \u0000energy transfer at heterogeneous interfaces and with other components. The thermodynamic properties of the \u0000refrigerant are calculated by the Patel-Teja equation-of-state. Simulation results predicted by the model were \u0000satisfactorily validated with experimental data. Predicted interaction between reactor, evaporator and cooling \u0000space showed non-linear behavior of gas pressure. The simulation results showed that, if the dynamics of the \u0000evaporator and cooling space are neglected, coefficient of performance (COP) is overestimated by 32% for \u0000the configuration evaluated in this work.","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78240123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"OBTAINING HIGH VALUE PRODUCTS IN A BIOREFINERY TOPOLOGY USING MICROALGAE","authors":"Á. González-Delgado, A. Barajas-Solano, V. Kafarov","doi":"10.29047/01225383.50","DOIUrl":"https://doi.org/10.29047/01225383.50","url":null,"abstract":"Resumen en: M icroalgae biomass presents high potential for third-generation biofuel production. It also contains other products whose recovery can contribute to the...","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77212060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Estimation of density and fracture orientation in HTI media through azimuth alanalysis of P-waves","authors":"Diana Marcela Cortes Gómez, W. Zambrano, L. A. M. Vides","doi":"10.29047/01225383.45","DOIUrl":"https://doi.org/10.29047/01225383.45","url":null,"abstract":"In a medium with Horizontal Transverse Isotropy (HTI) associated with fractures, Normal Move Out (NMO)\u0000velocity varies ellipsoidally with the azimuth. The major axis of the ellipse indicates the direction of the\u0000fractures. Also, density is defined by the axial ratio. We are presenting a methodology to estimate fracture\u0000parameters based on the difference of NMO times measured in two orthogonal common midpoint seismic\u0000lines. The method was tested with synthetic data and then applied in seismic data of the La Luna Formation\u0000in the Tenerife Field, providing the orientation of the fractures as well as an estimated density. Results were\u0000validated by analysis of Fullbore Formation Microimager FMI logs acquired in wells in the vicinity of the Field.","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75671451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Colloidal dispersion gels (CDG) to improve volumetric sweep efficiency in waterflooding processes","authors":"Rubén Hernán Castro García, G. Toro, J. E. Muñoz, Lia Margarita Cohen Paternina","doi":"10.29047/01225383.48","DOIUrl":"https://doi.org/10.29047/01225383.48","url":null,"abstract":"A viable option for the sustainability of hydrocarbon supply in the short and medium term is\u0000increasing the expected ultimate oil recovery factor through Enhanced Oil Recovery\u0000processes (EOR). f .\u0000The purpose of this paper is to describe a methodology to evaluate EOR technologies developed at the Instituto\u0000Colombiano del Petroleo (ICP) of ECOPETROL S.A. in 2012. The methodology includes theoretical evaluation,\u0000design (geological analysis, engineering analysis, laboratory static and dynamic tests and numerical\u0000simulation, among others), field implementation and surveillance of Colloidal Dispersion Gels (CDG) injection.\u0000CDG is an EOR method that consists in the co-injection of high molecular weight polymer and a crosslinker,\u0000to generate microgels in the reservoir. This technology has become an alternative to polymer flooding.\u0000This paper describes a field application in Dina Cretaceos Field (Dina) supported by the proposed methodology,\u0000which corresponds to the first chemical enhanced oil recovery pilot implemented in Colombia by ECOPETROL\u0000S.A. Results of this study show an increase in volumetric sweep efficiency due the improvement of the mobility\u0000ratio, increasing in oil production and decreasing in water production. Based on the results of this pilot,\u0000which started in June 2011, the feasibility of expanding the use of CDG technology in Dina and others fields\u0000of Colombia is being assessed at present.","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81991626","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A PROPOSAL FOR REGULARIZED INVERSION FOR AN ILL-CONDITIONED DECONVOLUTION OPERATOR","authors":"Herling Gonzalez, S. Avendaño, Germán Camacho","doi":"10.29047/01225383.47","DOIUrl":"https://doi.org/10.29047/01225383.47","url":null,"abstract":"From the inverse problem theory aspect, deconvolution can be understood as the linear inversion of an ill-posed and ill-conditioned problem. The ill-conditioned property of the deconvolution operator make the solution of inverse problem sensitive to errors in the data. Tikhonov regularization is the most commonly used method for stability and uniqueness of the solution. However, results from Tikhonov method do not provide sufficient quality when the noise in the data is strong. This work uses the conjugate gradient method applied to the Tikhonov deconvolution scheme, including a regularization parameter calculated iteratively and based on the improvement criterion of Morozov discrepancy applied on the objective function. Using seismic synthetic data and real stacked seismic data, we carried out a deconvolution process with regularization and without regularization based on a conjugated gradient algorithm. A comparison of results is also presented. Applying regularized deconvolution on synthetic data shows improved stability on the solution. Additionally, real post-stack seismic data shows a direct application for increasing the vertical resolution even with noisy data.","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80403149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}