Now showing items 946-965 of 1620

    • Kaolin quality determination through an algorithm based on non-parametric fuzzy logic 

      Ordóñez, Celestino; Saavedra, Angeles; Araújo, María; Giráldez, Eduardo
      In this article we describe a new fuzzy supervised classification method that is a modification of the fuzzy pattern-matching multidensity classifier. The latter has been demonstrated to be one of the most effective ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Kinetic and thermodynamic equilibrium of asphaltenes sorption onto formation rock: evaluation of the wash in the adsorptive properties 

      Cortés Correa, Farid Bernardo; Franco Ariza, Camilo Andrés; Giraldo Castro, Juliana; Ruiz Serna, Marco Antonio; Rojano, Benjamín Alberto
      The main objective was to obtain kinetic and thermodynamic equilibrium of asphaltene sorption onto powder ROCK obtained from the Guadalupe formation (washed and unwashed) at different times, temperatures and concentrations. ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Kinetic aspects of a dried thin layer carrot in a heat pump dryer 

      Gómez-Daza, Juan Carlos; Ochoa-Martínez, Claudia Isabel
      This article presents a mathematical model for drying thin layer carrot slices (Daucus carota) using a heat pump dryer (HPD). To select the equation that best describes the drying curve, 10 semi-theoretical and/or empirical ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Kinetic aspects on ferric arsenate formation in a fix bed gas-solid reaction system 

      Balladares, Eduardo; Parra, Roberto; Sánchez, Mario
      The fixation of arsenic contained in gases produced during pyrometallurgical processes by using solid ferric oxide was studied in the range 873-1073 K under different oxygen potential and solid aggregates porosities. Arsenic ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Kinetic modelling of drying of three varieties of yucca industrial 

      Torregroza Espinosa, Angelica María; Montes Montes, Everaldo Joaquín; Ávila Gómez, Adrián Enrique; Remolina López, John Fredy
      Drying of three varieties of cassava, was conducted in a tunnel type dryer; the effect of temperature, variety and velocity of drying air on the drying time, using a completely randomized design in factorial arrangement ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Kinetic of biogas production from oil palm empty fruit bunches 

      Carrillo-Nieves, Danay; Zumalacárregui-de-Cárdenas, Lourdes; Franco-Rico, Rafael; Sarvari-Horvath, Ilona
      The production process of oil from Elaeis guineensis palm produces an organic residual. Oil palm empty fruit bunches (OPEFB) are one of the main waste products, representing 7%. Up to now, OPEFB aren't totally used, being ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Kinetics of alcoholic fermentation using guava (psidium guajava) seed flour and dry mycelium of aspergillus niger as nitrogen sources 

      Serna Cock, Liliana; Mera Ayala, José Daniel; Angulo López, Jorge Eduardo; Gómez Schouben, Ana Lucía
      The kinetics of alcoholic fermentation was evaluated using the following substrates: molasses, urea, and diamine phosphate (MUDP); molasses and guava seed flour (MGSF); and molasses and dry mycelium of Aspergillus niger ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Laminar burning velocity of natural gas/syngas-air mixture 

      Cardona Medina, César Augusto; Amell Arrieta, Andrés Adolfo; Burbano Martínez, Hugo Javier
      This study suggests the equimolar mixture of Natural Gas (100% CH4) and Synthesis Gas (40% H2 + 40% CO + 20% CO2) as an alternative to reduce hydrocarbons consumption and reduce pollutant emissions. As a key parameter to ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Landmine detection technologies to face the demining problem in antioquia 

      Cardona Rendón, Lorena; Jiménez Builes, Jovani Alberto; Vanegas Molina, Nelson Antonio
      This paper presents a review of existing landmine detection techniques. The review is made with an analysis of the strengths and weaknesses of each technique in relation to the landmine detection problem in Antioquia, which ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Lattice-boltzmann method applied to the pattern formation on periodic surface structures generated by multiline nanosecond laser 

      Fonseca-Fonseca, Frank Rodolfo; Alfonso-Orjuela, José Edgar; Andrade, Darío Fernando
      We simulated the pattern formation on silicon surfaces. For this purpose, we used Lattice-Boltzmann method assuming two non-ideal interacting fluids using a lattice velocity D2Q9. The experiment was carried out with a ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Learning manager for remote experimentation with optoelectronic devices 

      García-Cedeño, Duván Fernando; Bernal Noreña, Álvaro
      Both the Internet and communications and information technology (ICT), are making a valuable contribution to education. Remote experimentation is an example of the contribution that becomes as a solution to various ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Levitación magnética en fluidos de alta viscosidad y densidad 

      Rondón, Eliana; Carrillo Escobar, Julio César; Correa Cely, Carlos Rodrigo
      Este artículo describe el diseño de un sistema prototipo de levitador magnético que opera sumergido en un aceite dieléctrico de viscosidad y densidad sustancialmente superior a la del aire. Se implementó un compensador de ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Libro de trabajo digital, un modelo para apoyar la colaboración 

      Collazos Ordóñez, César Alberto; Claros G., Iván Dario; Guerrero, Luís A.
      Partiendo de la inquietud por desarrollar nuevas herramientas para el soporte a la colaboración en los entornos educativos actuales, este artículo presenta la arquitectura y resultados experimentales de un conjunto de ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Liquefaction susceptibility assessment and study of "La Luciana" tailings dam fault (Spain, 1960) based on historical documents 

      Fernández-Naranjo, Francisco Javier; Rodríguez, Virginia; Rodríguez, Roberto; Alberruche, María Esther; Arranz, Julio Cesar; Vadillo, Lucas
      On 17 August, 1960 the biggest disaster by death toll in Spain, related with a tailings dam fault, took place in Reocín (Santander). The tailings dam "La Luciana" failed causing the death of eighteen people. After the ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Liquid crystal relaxation in three dimensions: the effect of hydrodynamic interactions 

      Gettelfinger, Brian T.; Hung, Fransisco R.; Hernandez Ortiz, Juan P.; Guzman, Orlando; Rey, Alejandro D.; Abbott, Nicholas L.; de Pablo, Juan J.
      We investigate the relaxation of two line defects of opposite strength in a confined nematic liquidcrystal by solving the coupled tensor order parameter evolution and momentum balance equations in three dimensions. The ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Lista de artículos publicados desde el n°141 al n°151 

      Dyna, Dyna
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Literature review methodology for scientific and information management, through its structuring and systematization 

      Gómez-Luna, Eduardo; Navas, Diego Fernando; Aponte Mayor, Guillermo; Betancourt-Buitrago, Luís Andrés
      This paper presents a methodology to find, organize and analyze the information in any field of research, thereby facilitating the acquisition of the available information and the identification of the main authors, the ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Límites de velocidad y distancia en la transmisión de información por un enlace óptico de bajo costo con recuperación libre de ruido 

      Montoya-Castro, Santiago Abelardo; Herrera-Duran, Juan Mauricio; Barrera-Ramírez, John Fredy
      En este trabajo se presentan los resultados de la transmisión de información por una red de fibra óptica convencional de bajo costo. La información a transmitir se almacena en un código de respuesta rápida (código QR) y ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Loads characterization using the instantaneous power tensor theory 

      Trujillo-Orozco, Odair Augusto; Garcés-Gómez, Yeison Alberto; Ustariz-Farfán, Armando Jaime; Cano-Plata, Eduardo Antonio
      This paper presents a novel methodology to characterize loads using the instantaneous power tensor theory in three-phase three-wire or four-wire systems. Tensor theory is based on the dyadic product between voltage and ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna. 
    • Local anodic oxidation on silicon (100) substrates using atomic force microscopy 

      Ávila Bernal, Alba Graciela; Bonilla Osorio, Ruy Sebastián
      A characterization of local anodic oxidation using scanning probe microscopy is performed on a (100) silicon substrate. The formation of patterns varies as a function of voltage, humidity, and scanning speed. A set of ...
      Universidad Nacional de Colombia Revistas electrónicas UN Dyna.