Gonzalez O.M.,University Las Fuerzas Armadas |
Nguyen K.A.,Griffith University
WCTE 2016 - World Conference on Timber Engineering | Year: 2016
The research that constitutes this paper is part of a series of publications that aim at understanding, from an engineering perspective, the form-structure-function relationship of senile coconut palm stems (Cocos Nucifera L.) as foundation for biomimetic applications. This study particularly aims at determining, evaluating and analysing the influence of the characteristic basic density distribution on the mechanical efficiency and properties of senile coconut stem green tissues (referred to here as cocowood) in terms of the palm stem mechanical performance per unit mass. To achieve these objectives, the cocowood mechanical efficiency is determined from the material performance indices, which in turn are calculated from the typical relationships of basic density-stiffness and basic density-compressive strength. The distinctive mechanical efficiency is modelled herein for the entire coconut stem-tissue structure. The research outcomes showed that the variation of basic density and its relationships with the material stiffness and strength give rise to a high mechanical efficiency, which was comparable to some advanced engineering materials. The knowledge advanced from this study has a significant future potential as it can be applied into the development of new superior material/structure concepts.
Piovan M.T.,National University of Costa Rica |
Piovan M.T.,University Las Fuerzas Armadas |
Olmedo Salazar J.F.,University Las Fuerzas Armadas
Mechanics Research Communications | Year: 2015
The scope of the present paper is to present some new contributions in the dynamics of curved/straight MEE beams. The structure consists of a curved beam constructed with ceramic/metallic materials whose elastic behavior can be modified by influence of electro-magnetic fields. The problem of coupled elastic, electric and magnetic fields is briefly explained and the motion equations for curved members are introduced. An equivalent model for a MEE curved beam is then deduced appealing to a few constitutive hypotheses that enable the derivation of the electric-magnetic fields acting on the beam in preferential and prescribed directions. The theoretical topics covered in the model include shear flexibility due to bending as well as coupled elastic-electro-magnetic terms, among others. The model can be reduced to other models (straight beams or curved beams) by dropping terms or the magneto-electric fields and/or geometric parameters. Comparisons with the available models (for the reduced case of straight beam) and 2D models evaluated in the context of finite element methodologies are presented as well. © 2015 Elsevier Ltd. All rights reserved.
Kumar B.,University las Fuerzas Armadas |
Smita K.,University las Fuerzas Armadas |
Cumbal L.,University las Fuerzas Armadas
IET Nanobiotechnology | Year: 2016
The present investigation was done to explore the potential of Lantana camara (L. camara) flower in the fabrication of gold nanoparticles (AuNPs). The shape and size of AuNPs have been successfully controlled by introducing small amounts of L. camara flower extract. It produced spherical nanogold of average size 10.6 ± 2.9 nm without any aggregation and showed significant photocatalytic degradation activity of the methylene blue (>62%, 10 mg/L) in the presence of solar light. In addition, the experimental approach is inexpensive, rapid and eco-friendly for industrial scale production of nanoparticles. © The Institution of Engineering and Technology 2016.
Kumar B.,University las Fuerzas Armadas |
Smita K.,University las Fuerzas Armadas |
Cumbal L.,University las Fuerzas Armadas |
Debut A.,University las Fuerzas Armadas
Journal of Saudi Chemical Society | Year: 2014
A simple, efficient, and ecofriendly method has been developed for the exclusive synthesis of iron oxide nanoparticles using an aqueous extract of Passiflora tripartita var. mollissima fruit. Transmission electron microscopy (TEM) and Dynamic Light Scattering (DLS) analysis show that the average particle size of spherical iron oxide nanoparticles is 22.3 ± 3. nm. The synthesized nanocatalyst is highly active for the synthesis of biologically significant 2-arylbenzimidazoles. The reaction was carried out under mild condition with excellent yields. The catalyst is easily separated by magnet and recyclable without significant loss of activity. © 2014 King Saud University.
Level of satisfaction of energy and macronutrients requirements in the usual intake of kids in rural areas of the ecuadorian highlands [Nivel de satisfacción de requerimientos energéticos y de macronutrientes en la ingesta usual de escolares en sectores rurales de la sierra ecuatoriana]
Pereira Gonzalez L.M.,University las Fuerzas Armadas
Revista Chilena de Nutricion | Year: 2016
This study, conducted among students from rural areas of Pujilí Canton, Cotopaxi Province, aged 8 to 15 years, allowed to determine: 1) The individual energy requirements by levels of physical activity; 2) the levels of energy and macronutrient sufficiency and balance of diet seen in the light of international standards. It was found that more than 70 % of schoolchildren do not meet the suggested range by the Joint Expert (World Health Organization / Food and Agriculture Organization of the United Nations/ United Nations University) for energy and fat intakes, but that percentage is less than 40 % for proteins and carbohydrates. Also, the results indicate that the percentage contribution from usual macronutrient intake of schoolchildren to their estimated energy intake reach respective goal requirements established. © 2016, Sociedad Chilena de Nutricion Bromatologia y Toxilogica. All rights reserved.
Merchan V.,University Las Fuerzas Armadas
CHILECON 2015 - 2015 IEEE Chilean Conference on Electrical, Electronics Engineering, Information and Communication Technologies, Proceedings of IEEE Chilecon 2015 | Year: 2015
The characteristics of a value-based quality system as part of the state of the art of Government Information Technology (GoIT), are a challenge for those who study these topics and propose the existence of a systematic and comprehensive mechanisms for quality assessment. In order to identify and classify the existing of empirical studies in the field of a value-based quality assessment for GoIT, a systematic mapping was proposed for studies that guide the development of this work. The method to be used to perform a specific systematic mapping, is used to reduce of biased results. Therefore, as a result of this research, the steps taken for mapping are described. From the 220 papers identified with different academic search engines, 14 were selected for compliance, and classified according to their type and contribution. The studies show that value-based quality evaluation in the context of GoIT seems to be an area that provides opportunities for further investigation and assessment for quality criteria focused on value. © 2015 IEEE.
Tierra A.R.,University las Fuerzas Armadas
IEEE Latin America Transactions | Year: 2016
At present time, Ecuador has a velocity field, but it does not have an interpolation method to calculate the velocities in other points. This study presents a strategy to interpolate the velocities trough the Artificial Neural Network - ANN with a Radial Basis Functions (RBF) type. To exercise this purpose we have used an available dataset in which the geocentric Cartesian coordinates (X,Y,Z) and their velocities (Vx,Vy,Vz) were known. These data were divided in three groups: The first group has been used to training phase; the second group to determinate the capacity of learning of the RBF; and lastly the third group to evaluate of generalization of the RBF by predicting the velocities in these points. In the same manner, we proceeded with the interpolation by using model velocities VEMOS09. Finally, in the test points the velocities differences were calculated, both RBF network as well as those of the VEMOS09. The results obtained demonstrate that interpolation can be better obtained by using a RBF network rather than VEMOS09.
Bernabe-Poveda M.-A.,University las Fuerzas Armadas |
Coltekin A.,University of Zürich
International Journal of Digital Earth | Year: 2015
The terrain reversal effect is a perceptual phenomenon which causes an illusion in various 3D geographic visualizations where landforms appear inverted, e.g. we perceive valleys as ridges and vice versa. Given that such displays are important for spatio-visual analysis, this illusion can lead to critical mistakes in interpreting the terrain. However, it is currently undocumented how commonly this effect is experienced. In this paper, we study the prevalence of the terrain reversal effect in satellite imagery through a two-stage online user experiment. The experiment was conducted with the participation of a diverse and relatively large population (n = 535). Participants were asked to identify landforms (valley or ridge?) or judge a 3D spatial relationship (is A higher than B?). When the images were rotated by 180°, the results were reversed. In a control task with ‘illusion-free’ original images, people were successful in identifying landforms, yet a very strong illusion occurred when these images were rotated 180°. Our findings demonstrate that the illusion is acutely present; thus, we need a better understanding of the problem and its solutions. Additionally, the results caution us that in an interactive environment where people can rotate the display, we might be introducing a severe perceptual problem. © 2014 Taylor & Francis.
Falconi C.E.,University las Fuerzas Armadas |
Yanez-Mendizabal V.,University of the Americas in Ecuador
Crop Protection | Year: 2016
The potential of dry heat treatment of Andean lupin seed to reduce seed–borne infection of the anthracnose pathogen, Colletotrichum acutatum, was investigated. First, the effect of dry heat (65 °C) over duration times of 0–96 h on germination and disease incidence after germination was evaluated for artificially– and naturally–infected seed. Dry heat treatment from 8 to 96 h reduced disease incidence after germination to undetectable levels in four cultivars compared with 7.5% disease incidence after germination in seed maintained at room temperature. Moreover, heat treatments of 4–12 h showed seed germination rates that were equivalent to the non–treated control. Under greenhouse conditions, dry heat treatments for 8 or 12 h reduced transmission of the pathogen from seed by 75 or 85%, respectively and dry heat treatment increased emergence of seedlings in comparison the non-treated control. Dry heat treatment is an environmentally friendly alternative for reducing anthracnose infections in Andean lupin seed. © 2016 Elsevier Ltd
Trivino R.D.,University Las Fuerzas Armadas
2016 3rd International Conference on eDemocracy and eGovernment, ICEDEG 2016 | Year: 2016
This paper describes an overview of the progress and achievements in the strategy of open government data implementation in Ecuador, as a project and as a process; through the review and analysis of proposed strategies and policies, resulting in the current state of the country in the South American context and the progress in public initiatives deployments. Among the conclusions is stated that the purpose of open government data does not end at promoting transparency, but also in open processes, supporting the actions of Open Government and even promoting innovation and entrepreneurship, which with a proper disclosure could become a unique case in the region. © 2016 Information Systems Research Group, University of Fribourg.