Ciencia Tecnologia y Futuro最新文献

{"title":"IMPROVEMENT OF LAB-SCALE PRODUCTION OF MICROALGAL CARBOHYDRATES FOR BIOFUEL PRODUCTION","authors":"Silvia-Juliana Jerez-Mogollón, Laura-Viviana Rueda-Quiñonez, Laura-Yulexi Alfonso-Velazco, A. Barajas-Solano, C. Barajas-Ferreira, V. Kafarov","doi":"10.29047/01225383.209","DOIUrl":"https://doi.org/10.29047/01225383.209","url":null,"abstract":"This work studied the improvement of biomass and carbohydrate (glucose and xylose) lab.scale productivity \u0000in Chlorella vulgaris UTEX 1803 through the use of the carbon/nitrogen ratio. In order to do \u0000so, mixotrophic cultures were made by the modification of initial concentration of CH3COONa (5, \u000010 and 20 mM) and NaNO3 (0.97, 1.94 and 2.94 mM). All treatments were maintained at 23 1oC, with \u0000light/dark cycles of 12h : 12h for 5 days. \u0000It was found that in addition to the carbon/nitrogen ratio, time also influences the concentration of biomass \u0000and carbohydrates. The treatment containing 10 mM acetate: 1.94 mM nitrate, reached a concentration of \u00000.79 g/L of biomass, 76.9 Eg/mL of xylose and 73.7 Eg/mL of glucose in the fifth day. However, the treatment \u0000containing 20 mM acetate: 0.97 mM nitrate produced 1.04 g/L of biomass, 78.9 Eg/mL of xylose and \u000077.2 Eg/mL of glucose in the third day, while in the same day the treatment containing 0 mM acetate: 2.94 \u0000mM nitrate, produced 0.55 g/L of biomass, 40.2 Eg/mL of xylose and 31.3 Eg/mL of glucose. \u0000The use of carbon/nitrogen ratios improved biomass productivity (from 0.55 to 1.04 g/L) as well as xylose \u0000(from 40.2 to 78.9 Eg/mL) and glucose (from 31.3 to 77.2 Eg/mL) concentration, representing an improvement \u0000of up to two times the production of both biomass and carbohydrates in only 3 days of culture.","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86736443","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":"PARTICLE MATTER FROM A DIESEL ENGINE FUELED WITH JATROPHA CURCAS OIL BIODIESEL AND ULTRA-LOW SULPHUR DIESEL","authors":"Helmer-Rodolfo Acevedo-Gamboa, E. Flórez-Serrano","doi":"10.29047/01225383.211","DOIUrl":"https://doi.org/10.29047/01225383.211","url":null,"abstract":"Biodiesels are promoted as alternative fuels due to their potential to reduce dependency on fossil fuels and carbon emissions. Research in this field has focused on the study of the emissions of light duty vehicles. However, particle matter and gaseous emissions emitted from heavy-duty diesel engines fueled by Jatropha Oil Biodiesel (JOB) and Ultra-Low Sulphur Diesel (ULSD) has not been studied. The objective of this study is to explore the performance and emission levels of a Cummins 4-stroke, 4.8 liter, 4-cylinder diesel engine with common rail fuel injection, equipped with a cooled Exhaust Gas Recirculation (EGR). There was a substantial reduction by the use of JOB in unburned hydrocarbons (- 45%), carbon monoxide (- 75%), and particulate matter (- 25%) compared to emission from diesel fuel. At mid and high loads, NOx emissions were higher for JOB compared to ULSD. Most of the particles (64%) for ULSD were in a range of between 40 and 560 nm. On the other hand, most of the particles (94%) for JCB mode were between 6 and 40 nm. In the range between 6 and 40 nm, mass mean diameters in ULSD were 34.4, 34.7 and 33.3 nm while for JOB they were 21.3, 18.2 and 20.1 nm for 100, 50 for a 10% load, respectively.","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78244201","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":"CALCULATION OF THERMOPHYSICAL PROPERTIES OF OILS AND TRIACYLGLYCEROLS USING AN EXTENDED CONSTITUENT FRAGMENTS APPROACH","authors":"Diana-Carolina Cruz-Forero, Oscar-Andrés González-Ruiz, L. López-Giraldo","doi":"10.29047/01225383.212","DOIUrl":"https://doi.org/10.29047/01225383.212","url":null,"abstract":"^len^aABSTRACT This paper validates and implements an Extended Constituent Fragments methodology (ECF) for the calculation of thermophysical properties of vegetable oils considering the latter as triglyceride (TAG's) mixtures, both homogeneous and heterogeneous. For this purpose, three different vegetables oils were chosen (soybean oil, canola and olive) and their TAG's profiles were estimated using the ECN 42 generalized method. The ECF methodology estimates the properties of TAG's from their fragment composition and specific parameters of each property, which are adjusted using experimental information available in literature. The average relative errors of calculated properties were between 1 and 32% depending on the oil and the property. These errors were significantly lower than those obtained using the Aspen HYSYS commercial software, which oscillates between 70 and 100%. Additionally, by extrapolating the constituent fragments methodology a method for calculating boiling temperatures of TAG's with average relative errors of ∼1% was proposed. The calculations of properties for the ECF method were performed using the OIL-CALPROP software developed specifically for this purpose.^les^aRESUMEN En este trabajo se valida e implementa la metodologia de Fragmentos Constituyentes Extendida (FCE) al calculo de propiedades termofisicas de aceites vegetales considerando a estos ultimos como mezclas de trigliceridos (TAG's) tanto homogeneos como heterogeneos. Para tal fin, se seleccionan tres aceites modelo (aceite de soja, canola y oliva) a los cuales se les estimaron los perfiles en TAG's, a partir de su perfil en acidos grasos empleando el metodo ECN 42 generalizado. Con el metodo de FCE se estiman las propiedades de los TAG's a partir de la composicion en fragmentos y parametros especificos de cada propiedad, los cuales son ajustados empleando informacion experimental disponible en la literatura. Los errores relativos promedio de las propiedades calculadas fluctuan entre el 1 y el 32% dependiendo del aceite y la propiedad. Estos errores son significativamente menores que los obtenidos empleando el software comercial Aspen HYSYS los cuales oscilan entre 70 y 100%.Adicionalmente, extrapolando la metodologia de fragmentos constituyentes, se propuso un metodo que permite el calculo de temperaturas de ebullicion de TAG's con errores relativos promedio de ∼1%. Los calculos de propiedades para el metodo FCE se realizaron usando el software OIL-CALPROP desarrollado especificamente para este proposito.^lpt^aRESUMO Neste trabalho se valida e implementa a metodologia de Fragmentos Constituintes Estendida (FCE) ao calculo de propriedades termofisicas de oleos vegetais considerando a estes ultimos como misturas de triglicerideos (TAG's) tanto homogeneos como heterogeneos. Para tal fim, selecionam-se tres oleos modelo (oleo de soja, canola e oliva) aos quais foram estimados os perfis em TAG's, a partir do seu perfil em acidos grassos empregando o metodo ECN 42 ge","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74056823","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":"DECONVOLUTION-TYPE IMAGING CONDITION EFFECTS ON SHOT-PROFILE MIGRATION AMPLITUDES","authors":"Flor A. Vivas-Mejía, Herling González-Alvarez, L. E. Jaimes-Osorio, Nancy Espindola-López","doi":"10.29047/01225383.217","DOIUrl":"https://doi.org/10.29047/01225383.217","url":null,"abstract":"Amplitude preservation in Pre-Stack Depth Migration (PSDM) processes that use wave field extrapolation must be ensured – first, in the operators used to continue the wavefield in time or depth, and second, in the imaging condition used to estimate the reflectivity function. In the later point, the conventional correlation-type imaging condition must be replaced by a deconvolution-type imaging condition. Migration performed in common-shot profile domain obtains the final migrated image as the superposition of images resulting of migrate each shot separately. The amplitude obtained in a point of the migrated image corresponds to the sum of the reflectivities for each shot which has illuminated such point, along the angles determined by the velocity model and the positions of the source and the receiver. The deeper the reflector, the lower the amplitude of the illumination field will be. As result, the correlation-type imaging condition produces images with an unbalanced amplitude decrease with depth. A deconvolution-type imaging condition scales the amplitudes through a correlation, using the weighting function dependent on the spectral density or the illumination of the downgoing wave field. In this article, two possible scaling functions have been used in the case of a single shot. In the case of data with multiple shots, five scaling possibilities are presented with the spectral density or the illumination function. The results of applying these imaging conditions to synthetic data with multiple shots show that the values of the amplitude in the migrated images are influenced by the coverage of the common midpoint, compensating this effect only in one of the imaging conditions described. Numerical experiments with synthetic data generated using Seismic Unix and the Sigsbee2a data are presented, highlighting that in velocity fields with strong vertical and lateral velocity variations, the balance of the amplitudes of the deep reflectors relative to the shallow reflectors is strongly influenced by the imaging condition applied.","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91038802","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":"DETERMINATION OF WELL-DRAINAGE AREA FOR POWER-LAW FLUIDS BY TRANSIENT PRESSURE ANALYSIS","authors":"F. Escobar, Laura-Jimena Vega, L. Bonilla","doi":"10.29047/01225383.214","DOIUrl":"https://doi.org/10.29047/01225383.214","url":null,"abstract":"Since conventional oil is almost depleted, oil companies are focusing their efforts on exploiting heavy oil reserves. A modern and practical technique using the pressure and pressure derivative, log-log plot for estimating the well-drainage area in closed and constant-pressure reservoirs, drained by a vertical well is presented by considering a non-Newtonian flow model for describing the fluid behavior. Several synthetic examples were presented for demonstration and verification purposes. Such fluids as heavy oil, fracturing fluids, some fluids used for Enhanced Oil Recovery (EOR) and drilling muds can behave as either Power-law or Bingham, usually referred to as the non-Newtonian fluids. Currently, there is no way to estimate the well-drainage area from conventional well test analysis when a non-Newtonian fluid is dealt with; therefore, none of the commercial well test interpretation package can estimate this parameter (drainage area).","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78045854","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":"Lactic acid production by Lactobacillus sp. from biodiesel derived raw glycerol","authors":"Yessica Prada Palomo, Marly Romero Vanegas, Pedro Miguel Diaz Ruiz, Daniel Molina Velasco, Carolina Guzmán Luna","doi":"10.29047/01225383.213","DOIUrl":"https://doi.org/10.29047/01225383.213","url":null,"abstract":"Lactic Acid (LA) is a versatile compound with extensive industrial usage. Lactic Acid Bacteria (LAB) are\u0000renowned for their capacity to ferment carbohydrates to LA. In the biodiesel industry, bioconversion\u0000of residual glycerol to monomers of biopolymers, such as LA, is an alternative for usage of this waste\u0000as raw material to produce a high value added biotechnological compound. This research evaluates LA\u0000production through fermentation processes using a Lactobacillus sp. native strain and raw glycerol from the\u0000biodiesel industry. Native strain was isolated from the processing of dairy, fruit, and vegetable products and\u0000through cultures in Man, Rogosa & Sharpe agar (MRS). After an adaptation phase, the fermentative capability\u0000of the strain was evaluated through chemical quantification of metabolites using Nuclear Magnetic Resonance\u0000(1H-NMR); fermentative potential was compared with a Lactobacillus sp. reference strain (ATCC 7469). The\u0000native strain Lactobacillus sp. CYP4 showed a higher bioconversion potential (LA concentration: 39.41 mM,\u0000conversion percentage: 39.27%, at 24 h, volumetric productivity: 1.28 g.L-1.h-1, yield: 0.71 g·g-1) from raw\u0000glycerol, when compared to the reference strain.","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80023082","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":"TRANSIENT PRESSURE ANALYSIS FOR VERTICAL WELLS WITH SPHERICAL POWER-LAW FLOW","authors":"F. Escobar, J. Martínez, L. Bonilla","doi":"10.29047/01225383.216","DOIUrl":"https://doi.org/10.29047/01225383.216","url":null,"abstract":"Los crudo pesados son considerados actualmente como una clase de yacimientos no convencional de \u0000mayor interes para la industria petrolera. Algunos de ellos muestran un comportamiento no Newtoniano \u0000pseudoplastico cuyo modelo matematico difiere del caso convencional y por ende, los regimenes de \u0000flujo presentan algunos comportamientos particulares. Los fluidos de fracturamiento, las espumas, algunos \u0000fluidos usados en recobro mejorado y los lodos de perforacion tambien caen en esta categoria. El flujo \u0000esferico/hemisferico causado por completamiento/penetracion parcial merece un tratamiento especial para \u0000flujo pseudoplastico. Se encontro para este caso una sola investigacion en la literatura que solo introduce \u0000el modelo matematico. \u0000En este trabajo se estudia el comportamiento de la presion y la derivada de presion para flujo esferico/hemisferico \u0000de un fluido ligeramente compresible, no Newtoniano ley de potencia (pseudoplastico) y se extienden \u0000la metodologias convencional y Tiab´s Direct Synthesis (TDS) para propositos interpretativos de pruebas de \u0000pozos. En flujo esferico/hemisferico pseudoplastico, la pendiente de la curva de la derivada ya no es de -½, \u0000es mas cambia con el valor del indice de comportamiento de flujo n, lo que indica que la interpretacion de \u0000datos de presion para los sistemas en cuestion usando metodos tradicionales no seria exacto. Se introducen \u0000nuevas ecuaciones para estimar la permeabilidad esferica/hemisferica y el factor de dano esferico/hemisferico \u0000para tales sistemas. Las ecuaciones se verificaron satisfactoriamente con casos simulados.","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89150939","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":"POLYMER GELS FOR CONTROLLING WATER THIEF ZONES IN INJECTION WELLS","authors":"Gustavo-Adolfo Maya-Toro, R. Castro-García, Z. Pachón-Contreras, José-Francisco Zapata-Arango","doi":"10.29047/01225383.215","DOIUrl":"https://doi.org/10.29047/01225383.215","url":null,"abstract":"^len^aABSTRACT Oil recovery by water injection is the most extended technology in the world for additional recovery, however, formation heterogeneity can turn it into highly inefficient and expensive by channeling injected water. This work presents a chemical option that allows controlling the channeling of important amounts of injection water in specific layers, or portions of layers, which is the main explanation for low efficiency in many secondary oil recovery processes. The core of the stages presented here is using partially hydrolyzed polyacrylamide (HPAM) cross linked with a metallic ion (Cr+3), which, at high concentrations in the injection water (5000 - 20000 ppm), generates a rigid gel in the reservoir that forces the injected water to enter into the formation through upswept zones. The use of the stages presented here is a process that involves from experimental evaluation for the specific reservoir to the field monitoring, and going through a strict control during the well intervention, being this last step an innovation for this kind of treatments. This paper presents field cases that show positive results, besides the details of design, application and monitoring.^les^aRESUMEN El recobro de hidrocarburos mediante inyeccion de agua es la tecnologia de recobro adicional mas extendida en el mundo, sin embargo, la heterogeneidad del yacimiento puede convertirlo en altamente ineficiente o costoso al provocar la canalizacion del agua. Este trabajo presenta una opcion quimica que, al ser implementada, permite controlar la canalizacion de altos porcentajes de agua inyectada en arenas, o fracciones de arenas especificas; lo cual es una de las principales explicaciones para la baja eficiencia de muchos procesos de recobro secundario. El corazon de los pasos o etapas aqui discutidos es la mezcla de agua con poliacrilamida parcialmente hidrolizada (HPAM), a concentraciones entre 5000 y 20000 ppm, y un ion metalico (Cr+3), mezcla que en el yacimiento forma un gel rigido que desvia el agua inyectada hacia zonas no barridas. Las etapas mencionadas incluyen desde evaluacion experimental hasta monitoreo en campo, pasando por un control estricto de la operacion en el pozo inyector, siendo este ultimo componente completamente innovador para este tipo de tratamientos. Se presentan aqui resultados de campo que demuestran beneficios, al tiempo que se detalla el proceso de diseno, aplicacion y seguimiento.^lpt^aRESUMO Orecobro de hidrocarbonatos mediante injecao de agua e a tecnologia de recobro adicional mais estendida no mundo, entretanto, a heterogeneidade da jazida pode converte-lo em altamente ineficiente ou caro. Este trabalho apresenta uma opcao quimica que, ao serem implementados, permitem controlar a canalizacao de altas porcentagens de agua injetada em areias, ou fracoes de areias, especificas; o qual e uma das principais explicacoes para a baixa eficiencia de muitos processos de recobro secundario. O coracao dos passos ou etapas aqui discutido","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75309161","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":"LAMINAR FLAME SPEED OF SOY AND CANOLA BIOFUELS","authors":"Juan-Sebastián Gómez-Meyer, S. Gollahalli, R. Parthasarathy, J. Quiroga","doi":"10.29047/01225383.223","DOIUrl":"https://doi.org/10.29047/01225383.223","url":null,"abstract":"In this article, the flame speed values determined experimentally for laminar premixed flames of the vapors of two biofuels in air are presented. The laminar flame speed is a fundamental thermochemical property of fuels, and is essential for analyzing the flame propagation in practical devices, even those employing turbulent flames. The fuels obtained from transesterification of soy and canola oils are tested. Also, the diesel flames are studied to serve as a baseline for comparison. The experiments are performed with a tubular burner; pre-vaporized fuel is mixed with hot air and is ignited. The flame speed is determined at fuel-equivalence ratios of 1; 1,1 and 1,2 by recording the geometry of the flame. The experimental results show that the flame speed of biofuels is lower by about 15% than that of diesel. Also, the maximum value of flame speed is obtained at an equivalence ratio of approximately 1,1.","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85809172","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":"EFFECT OF PITCH PETROLEUM OXIDATION ON MESOPHASE PRODUCTION","authors":"J. Barraza-Burgos, Juan-Manuel Ospina-Espinosa","doi":"10.29047/01225383.220","DOIUrl":"https://doi.org/10.29047/01225383.220","url":null,"abstract":"This study used two Colombian petroleum pitches (an asphalt and a precipitate) to determine their capacity as precursor of carbonaceous materials. In order to obtain the mesophase, pitches were oxidized at temperature of 350°C and oxidation times of 2; 3 and 5 hours. Oxidized pitches were fractioned with toluene using a ratio of 20 mL Toluene/g of oxidized bitumen. Insoluble material in Toluene (IT) and Tetrahydrofurane (ITHF) were carbonized with nitrogen at 400°C. For the identification of the mesophase, specimens were fabricated with the material obtained from carbonization. For the quantification of the mesophase, a microscope with polarized light filter was used. A total of 500 points were counted. The results showed that the asphalt treated with the longest oxidation time, contained higher concentration of mesophase. By contrast, the precipitate treated with the shortest oxidation time produced higher concentration of mesophase.","PeriodicalId":10235,"journal":{"name":"Ciencia Tecnologia y Futuro","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86432067","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}