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Nondimensionalization of a differential equation in a practical engineering problem
This work shows an application of Buckingham Pi theorem to obtain dimensionless parameters from a differential equation used to model an elastic damper system attached to the bumper of a car. Although the original problem ... -
Obtaining fatty acids from biomass microalgal grown under differemt lightining conditions
It is considered that microalgae fatty acids have the potential to be used as raw material for the production of biofuels such as biodiesel or food supplements. The experimental treatment consisted in the exposure of the ... -
Particle size distribution of iron tetracarboxifenilporfirina (III) adsorbed on silicon dioxide by dynamic light scattering
Particle size distribution is a critical property for characterizing particles in suspension systems. Porphyrins are sensitizers essential for different photo-chemical applications, however these compounds form aggregates ... -
Physicochemical Characterization of the mo/cuins2/zn(o,oh)s/zno System by Using Photoelectron Spectroscopy XPS and AES
Volume and surface spectroscopy techniques are reliable analytical methods to characterize thin films of different materials. This paper presents results related to the composition of the absorbing film (CuInS2) and the ... -
Productivity Behavior in a Cluster of Plastic Companies Established in Bogotá D.C. and Dedicated to the Manufacture of Containers, Packing, and Packaging from 2003 to 2009
This article indicates the productivity status in the plastic cluster sector in the city of Bogotá, under the terms set by the production function of Cobb-Douglas in order to establish the related points between a specific ... -
Proposal of a Linear Differential Equation of First Order that Shapes A Mixture Problem: Mobilization Difficulty among Representation Records and Natural and Algebraic Language
Although the notion of differential equation is present in fields such as mathematics and engineering , understanding by students and some teachers has been limited due to the algebraic approach that has focused teaching ... -
Propuesta de diseño de un simulador de un microscopio electrónico de barrido para el desarrollo de aprendizaje significativo en nanotecnología
Se hace un estudio donde se identifica la necesidad de herramientas virtuales de aprendizaje de bajo coste para la enseñanza en nanotecnología y se propone el diseño de un simulador educativo para un equipo de microscopía ... -
Raman investigation of electric field induced molecular modifications in organic field effect transistors
The influence of external electric fields on the vibrational properties of Pentacene-based field effect transistors were investigated by Ramanspectroscopy.ThemonitoredRamanbandswereintherangefrom 1100cm−1 to1200cm−1,whereabr ... -
Redesign and optimization of a device small-scale composting to be used in urban agriculture projects
Small-scale composting on closed devices was one of the key research topics of the Bogota Botanical Garden (JBB) for the development of the Urban Agriculture Project 319 activities. Given the consolidation scenario of an ... -
Reliability engineering of Computing Systems thorugh EMSI
All systems are comprised by a series of interconnected devicesin such way that they are capable of performing particular functions. These functional blocks may be constituted by a single component or complex subsystems, ... -
Revisión del estado del arte en modelos de localización y relocalización de vehículos para atención de emergencias
El presente artículo hace una revisión del estado del arte en modelos para la localización y relocalización de vehículos para la atención de emergencias entre los cuales se encuentran los sistemas de atención de emergencias ... -
Simultaneous determination of Cu, Zn and Sn by using anodic stripping voltammetry film electrode Bismuth
It was shown the possibility to determine simultaneously the concentration of Zn and Cu in aqueous solution by Anodic Stripping Voltammetry Square Wave (SWASV) by in situ formation of a bismuth film electrode (BiFE) on a ... -
Síntesis de capas buffer para celdas solares de película delgada
En este trabajo se hace una revisión del funcionamiento y estado actual de las capas buffer libres de Cadmio; componentes esenciales de las celdas solares de tecnología de película delgada. Se hace especial énfasis en ... -
Síntesis de películas transparentes y conductoras utilizadas en celdas solares sensibilizadas por colorantes
Este trabajo presenta la síntesis y caracterización de materiales transparentes y conductores utilizados en celdas solares fotoelectrocatalíticas. Específicamente, recubrimientos de óxido de Estaño conductor sintetizados ... -
Síntesis, caracterización y aplicación de poli–3,4–dialcoxitiofenos
A pesar del rápido crecimiento que ha tenido el uso de las celdas solares para la generación de electricidad, los altos costos de fabricación de los dispositivos tradicionales ha impedido su masificación. Se hace necesario ... -
Sobre las reacciones de eliminación de compuestos contaminantes de aguas por fotocatálisis con TiO2/UV: caso azul de metileno
Dada la gran importancia que la fotocatálisis heterogénea y los procesos avanzados de oxidación actualmente tienen alrededor del mundo entero en cuanto a la descontaminación de aguas se refiere, es necesario entender los ... -
Study on the Maintenance Costs of Military Helicopters by Using ABC Costing
According to information provided by the Colombian Air Force and to investigations on helicopter maintenance, it is possible to highlight control and activity classification mechanisms. This is developed when incorporating ... -
Synthesis of ZnS thin films by CBD for use as buffer layer in solar cells based on Cu2SnZnS4
ZnS thin films were deposited by CBD (chemical bath deposition) method using a solution containing thiourea and zinc acetate as sources of S and Zn and ammonium citrate as complexing agent. The samples were grown on soda ... -
The effects of temperature on the structure and morphology of (Ti,Al)N coatings
(Ti,Al)N films were grown on a susbtrate of stainless steel by means PAPVD by controlled pulsed cathodic arc technique usinga target of TiAl (50/50 % atomic) in an Ar + N atmosphere. The coatings were deposited at different ... -
Toxicidad aguda de una formulación comercial de glifosato sobre Poecilla reticulata (pisces:poecilidae) en condiciones de laboratorio
El glifosato es un herbicida ampliamente usado en Colombiatanto en actividades agrícolas como para la erradicación de cultivosilícitos. La deriva por viento en aspersiones aéreas y la lixiviación deeste producto pueden ...