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Sandoval-Diaz L.-E.,National University of Colombia | Aragon-Quiroz J.-A.,National University of Colombia | Ruiz-Cardona Y.-S.,National University of Colombia | Dominguez-Monterroza A.-R.,Grancolombiano Polytechnic | Trujillo C.-A.,National University of Colombia
Microporous and Mesoporous Materials | Year: 2017

The thermodynamic method of fractal analysis applied to N2 adsorption data of porous solids (commonly known as Neimark-Kiselev or NK algorithm) is discussed. Two refinements are shown and tested on two series of Y zeolites modified by either steaming or pseudomorphic treatment, and the results are compared with previous attempts of fractal analysis. Zeolites steamed in the presence of NaCl were amorphized and deconstructed at the micro-mesopore level, with the calculated surface fractal dimension decreasing accordingly. Zeolites treated in alkaline media and in the presence of a pore directing template developed ordered mesoporosity. The fractal dimension increased for the last group, reaching values near 3. The refined method is shown to fit more reasonably the data of capillary condensation than either NK or volume-corrected algorithms, and gives surface fractal dimension values within the expected interval of 2–3. The surface fractal dimension is shown to function as a quantitative indicator of modifications on materials porosity, and it is implied that modern methods of isotherm interpretation are necessary and still expecting implementation to attain a better description of materials porosity. © 2016 Elsevier Inc.


Bernal M.A.,Grancolombiano Polytechnic | Camacho F.J.,Sergio Arboleda University | Martinez R.,National University of Colombia
European Journal of Physics | Year: 2013

Dimensional analysis, and in particular the Buckingham Π theorem is widely used in fluid mechanics. In this paper we obtain an expression for the impact parameter from Buckingham's theorem and we compare our result with Rutherford's original discovery of the early twentieth century. © 2013 IOP Publishing Ltd.


Cortes-Rico L.J.,Pontifical Xavierian University | Cortes-Rico L.J.,Grancolombiano Polytechnic | Florez-Valencia L.,Pontifical Xavierian University
2015 10th Colombian Computing Conference, 10CCC 2015 | Year: 2015

Tangible User Interfaces is a specialized area of research inside human-computer interaction, that is oriented to the access, representation and manipulation of digital information through everyday physical objects. This paper presents the proposal of a modeling notation to describe tangible interfaces, defined as a UML (Unified Modeling Language) profile, in which we used its extension mechanisms to describe this type of interfaces. The proposal is founded on the conception of tangible interfaces, and from a wider perpective tangible interactions, as a diffuse boundary between material and digital. In this sense, the notation allows the representation of these dimensions in the same diagram, specifically, an extended class diagram. © 2015 IEEE.


Cortes-Rico L.,Pontifical Xavierian University | Piedrahita-Solorzano G.,Grancolombiano Polytechnic
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2015

This paper presents a project for the social development of ICTs, which used a participatory design approach and sought to have a high social impact on a community of craftswomen (embroiderers from Cartago, Colombia). Participating in this project implied active dialogue with the community to recognize the knowledge of each participant and achieve culturally relevant representations materialized in technological artifacts. We posit dialogue, representation and recognition as key elements for developing successful participatory design. In practice, this was achieved through an iterative, incremental and open-ended methodology, whose main feature was engagement by doing. This process of design allowed engineers to recognize the craftswomen’s traditional knowledge and allowed craftswomen to be less afraid of technology. The main resultant artifact was a tangible user interface that facilitates dialogue between fashion designers and embroiderers in the process of designing new embroidery patterns. This and other artifacts that emerged from the activities and dialogues, the level of engagement of the participants, and the convergence points discovered between embroidery and technology, lead us to conclude that the process presented here can be replicated with other craft communities, to reinforce these communities and assist them in generating innovation in their processes and products. © IFIP International Federation for Information Processing 2015.


Quinones C.,University of America | Quinones C.,Grancolombiano Polytechnic | Ayala J.,University of America | Vallejo W.,National University of Costa Rica
Applied Surface Science | Year: 2010

In this work TiO2 thin films were modified with gold/palladium (Au/Pd) bimetallic paticles by sputtering method. TiO2 films were deposited on ITO (SnO2:In) by Doctor Blade method and post-anneling. The properties of the films were studied through measurements of XRD (X-ray diffraction) and AFM (atomic force microscopy). The degradation of methylene blue was studied by UV-irradiated pure TiO2 and Au/Pd-modified TiO2 in aqueous solution. Langmuir-Hinshelwood model was used to obtain kinetic information. Photocatalytic study indicated that Au/Pd-modified TiO2 photocatalytic activity was better than TiO2 pure; the best half-life time for Au/Pd-modified TiO2 in photodegradation was 2.8 times smaller than TiO2 pure; finally the efficiency in methylene blue photodegradation was improved from 23% to 43% when Au/Pd-modified TiO2 films were used. © 2010 Elsevier B.V.


Gomez A.,EAFIT University | Quintero L.,EAFIT University | Lopez N.,National University of San Juan | Castro J.,Grancolombiano Polytechnic
Journal of Physics: Conference Series | Year: 2016

In this work, we perform a first approach to emotion recognition from EEG single channel signals extracted in four (4) mother-child dyads experiment in developmental psychology. Single channel EEG signals are analyzed and processed using several window sizes by performing a statistical analysis over features in the time and frequency domains. Finally, a neural network obtained an average accuracy rate of 99% of classification in two emotional states such as happiness and sadness.


Pineda-Escobar M.A.,Grancolombiano Polytechnic | Cuervo F.G.,Association for Consumer Research
Advances in Sustainability and Environmental Justice | Year: 2016

Purpose - The purpose of this chapter is to call for a better cohesion between development cooperation, on the one hand, and inclusive business, on the other. This contributes to the existing post recessionary debate on development cooperation, in which, (i) traditional aid and partnership effectiveness are being revised and, (ii) the role of the private sector in development is being emphasized. It builds on recent discussions that call for a more strategic use of development cooperation to leverage other development-oriented flows, particularly those coming from the private sector. Methodology/approach - The chapter corresponds to a conceptual chapter. Results were obtained through the study and comparison of secondary sources and a literature review. It first explores donor-private sector relations, paying particular attention to the OECD Development Assistance Committee (DAC), and then moves on to the study of inclusive business in relation to development aid. Findings - The study first reflects upon shifts perceived in development cooperation since the Great Recession, and analyses how foreign donors have engaged more widely with businesses for addressing global development challenges. The concept of inclusive business is then introduced, describing how although the development community acknowledges the potential of the private sector as a driving force for development, inclusive business have hitherto been developing, to a great extent, aside of broader development efforts. The final section presents a typology that proposes various ways in which donor agencies may integrate inclusive business support into their private sector programs. Practical implications - The chapter is of use for both academics and practitioners with an interest in development cooperation and/or inclusive business. Originality/value - Proposing a conceptual study that tends toward a greater cohesion between inclusive business and development cooperation is a contribution to the literature that has emerged on Base of the Pyramid markets since early 2000s. It is argued that such cohesion may prove valuable for the betterment of public-private relations, turning them more responsive to the challenges of sustainable development in the post-2015 world. Copyright © 2016 Emerald Group Publishing Limited.


Corredor J.A.,National University of Colombia | Benavides L.R.,Grancolombiano Polytechnic
International Journal of Gaming and Computer-Mediated Simulations | Year: 2016

This article aims at investigating the differences among three groups having distinct levels of experience in massively multiplayer online role-playing games (MMORPG), when solving a character design task in the videogame World of Warcraft (WoW), and when planning how to use the character during gameplay. These groups consisted of inexperienced players, general experts in MMORPGs and specialized WoW domain experts. The evaluation showed that MMORPG experience developed character design abilities that could be applied to other videogames (e.g., general expertise skills). Such skills were related to the ability to identify deep features related to particular types of characters (e.g., Rogue). The results also showed that there are domain expertise specific abilities, which only experts in WoW have. Such abilities were related to building game descriptions that could be considered narrative in the cognitive sense of the term, because they include time, intention and interaction, and also to identifying WoW-specific variables. Copyright © 2016, IGI Global.


Ramirez Triana C.A.,Grancolombiano Polytechnic
Energy Policy | Year: 2011

As with any other bioenergy product, bioethanol production requires fossil fuel inputs; hence the alleged benefits of energy security and carbon mitigation depend on the extent to which these inputs are capable of drawing a substantive bioenergetic yield. Brazilian ethanol, made out of sugarcane, has been reported as the most efficient gasoline substitute that is commercially available nowadays. For that reason it has been the object of several analyses on the energetics, i.e. energy balances. These studies surprisingly vary widely according with the scholar approach and are not fully comparable among them due to divergences in the assessment method. This paper standardises results of the four most prominent authors in the field, establishing a point of comparison and drawing some light on the energetics studies on biofuels. The main result is shown in Table 5, which homogenises the outcomes for referred studies in terms of unit of assessment in the energy input analysis. Subsequently, this information is also charted (Fig. 2) explaining the source of divergence among authors. This work ends with a short reference and comparison to some energy balance studies carried out on feedstocks of diverse nature, highlighting the potential that sugarcane-based bioethanol represents nowadays. © 2011 Elsevier Ltd.


Pineda-Escobar M.A.,Grancolombiano Polytechnic
Advances in Sustainability and Environmental Justice | Year: 2013

Purpose -The aim of this chapter is to explore the existing relation between business activity and sustainability in Base of the Pyramid (BoP) contexts in order to shed light on the role that the business sector may have in poverty alleviation. Design/methodology/approach -Starting with a thorough review of the evolution of the BoP theory, the chapter moves on to critically examine corporate social responsibility (CSR) in poverty contexts, and suggests the adoption of a more comprehensive interpretation of CSR that fully incorporates sustainability -environmentally, economically, and socially -into business operation. Consecutively, the notion of "sustainable enterprise" (Hart, 2010) as an upgraded type of corporation that embraces sustainable development is explored, and is related to the BoP business models known as inclusive businesses (IB). Case study experiences from Latin America (i.e., Colombia) are used to exemplify IB implementation. Findings -The chapter highlights the relevance of IB as sustainable enterprises with the potential of significantly improving the living conditions for most impoverished communities, while being economically profitable and environmentally viable. From a sustainability viewpoint, the greatest challenge is found to be the achievement of a balance between a greater consumption and production at the BoP and the limited environmental capacity of the earth. Originality/value of chapter -Both, BoP and IB are two notions of very recent appearance within business-society literature, making this chapter a valuable contribution for the advancement of scholarly work in the field. © 2013 by Emerald Group Publishing Limited.

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