Artículos: Recent submissions
Now showing items 1561-1580 of 4223
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Density functional theory studies of the adsorption of Cr (VI) on Fe-(hydr) oxide: Gibbs free energies and pH effect
Adsorption of chromium (VI) on iron oxides is a potential removal method from industrial wastewater. Cr (VI) is a toxic specie for human health due to its easy mobility in the environment. Currently, US EPA drinking water ... -
Detecting ultra-fast and near-infrared pulses based on two-photon absorption in multiple quantum wells
A theoretical framework and the computational infrastructure for optical characterization of a waveguide (WG) photodetector (PD) are presented based on multiples quantum well (MQW) with a rib structure that is able to ... -
Conocimientos Sobre La Explotación Sexual Comercial Asociada A Viajes Y Turismo En Estudiantes De Educación Superior
The commercial sexual exploitation of children and adolescents (CSEC) is a crime that is increasing worldwide and it is of great concern because it deals with a type of sexual abuse that violates the rights of children and ... -
Contributions of the Melanopsin-Expressing Ganglion Cells, Cones, and Rods to the Pupillary Light Response in Obstructive Sleep Apnea
Purpose: To investigate the impact of obstructive sleep apnea (OSA) on the contribution of inner and outer retinal photoreceptors to the pupillary light response (PLR). Methods: Ninety-three eyes from 27 patients with OSA ... -
Comparison of the effects generated by the dry-soft grinding and the photodeposition of Au and Pt processes on the visible light absorption and photoactivity of TiO2
The influence of dry-soft grinding and photodeposition of gold (Au) or platinum (Pt) in the improvement of the photoactivity of TiO2 synthesized by an integrated sol-gel and solvothermal method was studied. TiO2 was modified ... -
Effect of lattice deformation on electronic and optical properties of CuGaSe2: Ab-initio calculations
In this study, we have investigated the effect of bi-axial, ?ab, and uni-axial, ?c, strains on the optoelectronic properties of chalcopyrite semiconductor CuGaSe2 through first-principles full potential linearized augmented ... -
CO2 activation on small Cu-Ni and Cu-Pd bimetallic clusters
The use of CO2 to produce methanol is a reaction of growing interest, where bimetallic Cu-M catalysts become relevant as an alternative to the known Cu/Zn/Al2O3 catalyst. However, there is a lack in the understanding of ... -
Community journalism: Appropriation, mediation and transfer of media. Dialogue of knowledge between academia and communication collective [Periodismo comunitario: Apropiación, mediación y transferencia de medios. Diálogo de saberes entre Academia y colectivos de comunicación]
This article reflects on two processes of appropriation and media management with a social sense, which are founded upon the recognition of communication processes and their impact on the transformations of peripheral ... -
Common aspects of the Chicago and Harvard schools of antitrust analysis: The neo-institutional contribution [Aspectos comunes de las escuelas de Chicago y Harvard en materia de libre competencia: El aporte del neoinstitucionalismo]
On the understanding that Harvard and Chicago Schools postulates, this paper conducts a comparative analysis between those and the conceptual pillars of the Neo-institutional School. Within the framework of traditional ... -
Cocreation of adaptative components for a virtual platform based on learning styles [Cocreando componentes adaptativos para una plataforma virtual basados en estilos de aprendizaje]
This paper presents the results of the co-creation stage of adaptive components for e-learning platform, focusing on learning styles. The co-creation is considered the methodology that allows to identify the adaptability ... -
Comparison of alumina ball size distribution in two white cement grinding units using swebrec function [Comparación de la distribución de tamaño de bolas de alúmina en dos unidades de molienda de cemento blanco utilizando la función swebrec]
The results of characterizing the alumina ball size distribution in two mills of a crushing and grinding plant are shown. The mills were unloaded and the ball charge was screened in order to establish the ball size ... -
Carbonation study in a cement matrix with carbon nanotubes
Carbon nanotubes as additions in Portland cement based matrices have a great potential to improve the mechanical properties of mortars and concretes; however, little work has been done regarding the effect that they have ... -
Double-walled carbon nanotube deformation by interacting with a nickel surface: A DFT study
The effect of interaction between (4,4)@(9,9) double-walled carbon nanotube and Ni(111) surface is studied by density functional theory calculations, including van der Waals interaction effects. Different modes of adsorption ... -
Citizen participation in Colombia s constitutional process of 1991. Right to education [La participación ciudadana en el proceso constituyente de Colombia de 1991. El derecho a la educación]
"During the constituent process in Colombia of 1990 to 1991, specific participatory mechanisms were established in order to allow the citizenship to present initiatives in regard to those subjects that they considered, at ... -
Business intelligence applied to ecotourism in Colombia: A case study using CRISP-DM Methodology [Inteligencia de negocios aplicada al ecoturismo en Colombia: Un caso de estudio aplicando la metodología CRISP-DM]
Tourism is a relevant economic activity for the Colombian government and given the comparative advantages that the country has, ecotourism is a prioritized focus on productive development. For tourism, the government has ... -
Automated velocity estimation by deep learning based seismic-to-velocity mapping
We propose a novel method for velocity estimation that leverages the newest advances in Deep Learning (DL) technology. This method is fully automatic and maps seismic shot-domain data to corresponding depth-domain velocity ... -
Assessment of the current situation of informal recyclers and recycling: Case study Bogotá
The contribution of recyclers to the environment and the local economy is not recognized and they are not remunerated for the service they provide to the city. It is well known that informal collection contributes to the ... -
Binding and activation of ethylene on tungsten carbide and platinum surfaces
Density functional calculations were used to evaluate the ability of cubic and hexagonal phases of tungsten carbide to bind ethylene, as a model compound of unsaturated hydrocarbons, since its adsorption is the first step ...