Technical University of the North, Ibarra

www.utn.edu.ec
Ibarra, Ecuador
SEARCH FILTERS
Time filter
Source Type

VELAZQUEZ-MARTI B.,Polytechnic University of Valencia | CAZCO-LOGRONO C.,Technical University of the North, Ibarra
Experimental Agriculture | Year: 2017

The development of dendrometric methodologies could allow accurate estimation of variables associated with the crown, such as primary production (fruit and timber) and tree vigor. The aim of this work was to develop a suitable method to estimate woody biomass in plum trees (Prunus domestica L.) in Imbabura, Ecuador by using an adapted dendrometry. Form factors and regression models were defined for branch volume calculation. From this, the distribution of woody biomass in the crown tree was characterized in every stratum. Occupation Factor and regression models were obtained in order to calculate the biomass in the crown tree, which can be used to estimate the CO2 captured in its structure during its development. Regression models for calculation of whole volume of the tree and pruned biomass were directly obtained from crown diameter and crown height with R ajustated 2 of 0.74 and 0.81. The average moisture content of green material was 51%, and the average density of dry material was 0.66 ± 0.07 g cm−3. Proximate analysis of plum wood showed at 79.8 ± 9.2% volatiles and 2.1 ± 0.3% ash. Elemental analysis of the wood pointed to 46.5 ± 1.2% C, 6.1 ± 0.5% H, 46.3 ± 1.2% O, 0.6 ± 0.3% N, 0.06 ± 0.02% S and 0.02 ± 0.01% Cl. Cl, S and N contents are lower than the limits established by the standard EN 14691-part 4. With 46% of C, considering the relation 3.67 (44/12) between CO2 and C content, the CO2 sequestrated in the materials is 1.11 Mg m−3 wood material. Such method represents a tool to manage orchard resources and for assessing other parameters, such as raw materials for cultivation, fruit production, CO2 sink and waste materials (residual wood) used for energy or industry. Copyright © Cambridge University Press 2017


Rybarczyk Y.,New University of Lisbon | Rybarczyk Y.,Technological Amerindian University, Ambato | Carvalho D.,Technical University of the North, Ibarra
Advances in Intelligent Systems and Computing | Year: 2017

This research consists in studying the effect of the implementation of a biological law on the teleoperation of a mobile robot. Two experimental conditions are compared: a Manual one, in which the velocity of the robot is controlled by the human operator, and a Biological one, in which the vehicle’s speed is automatically calculated by using the 2/3 Power Law. Results show that the robot is driven faster and safer with the human-like behavior than without. The objective of the study is to propose an innovative method for the development of semi-autonomous vehicles, which is based on an anthropomorphic approach. © Springer International Publishing Switzerland 2017.


Galeas M.O.,Technical University of the North, Ibarra | Barahona A.,Technical University of the North, Ibarra | Lugo R.S.,Technical University of the North, Ibarra
Archivos Latinoamericanos de Nutricion | Year: 2017

This cross-sectional study assessed the nutritional status of 120 Ecuadorian indigenous adults Awá to determine the correlation between BMI and body fat percentage estimated by bioelectrical impedance, as well as to evaluate the diagnostic accuracy of BMI to detect excess body fat percentage in this population. Mean BMI was 23.81 ± 1.95 kg / m2 in men and 23.58 ± 1.95 kg / m2 in women, and mean body fat percentage was 11.4 ± 5.9 in men and 19.97 ± 7.19 in women. A significant positive correlation was observed between BMI and body fat percentage in men (r=0.54, p<0.01) and in women (r=0.72, p<0.01). There was also a significant positive correlation in groups of 18-40 years (r=0.79, p<0.01) and 40-59 years (r=0.49, p<0.01), while in older than 60 years the correlation was positive but not significant (r=0.50, p=0.97). There was significant correlation in the group considered healthy by fat percentage (r=0.54, p<0.001), but there was no significant correlation in under fat and over fat groups (r=0.07 p=0.57, r=0.38 p=0.31 respectively). BMI =25 kg/m2 showed a sensitivity of 90%, specificity 75% and an area under the curve of 0.88 (95% CI from 0.81 to 0,95) to detect excess body fat. In conclusion, although the use of BMI as a predictor of excess fat is justified in this population, it is necessary to conduct more studies to develop additional indicators for assessing the nutritional status of in more comprehensive way, not only focused on overweight and obesity.


Aiello R.C.,Technical University of the North, Ibarra | Huaca D.K.C.,Technical University of the North, Ibarra
2017 IEEE Mexican Humanitarian Technology Conference, MHTC 2017 | Year: 2017

Quinoa is an Andean grain with high protein content that has achieved, in recent years, a great acceptance in the international market. However, the presence of saponin and its toxicity in the grain surface makes necessary its elimination for human consumption. This article deals with the elimination of saponin in fluidized bed for the bitter Chimborazo quinoa, with an initial saponin content of 0.45%, and compared to traditional wet methods. The experimental equipment is controlled by the Data Capture Unit of the National Instruments NI cDAQ-9139, which makes the interface between the reactor and the internal computer through Lab VIEW software, with High level of automation. A 3 factorial experiment was designed, where the independent variables were the surface roughness, air speed, pulse of air flow and dependent variable was the saponin content of the final product. The statistical processing showed significance for the 3 independent variables. Saponin content values of 0.08% were obtained and only a slight rinse was necessary to achieve recommended for human consumption value of 0.06%. It was determined that both protein values as color, do not change with process desaponification used. The proposed method significantly reduces water consumption compared to traditional wet desaponification method widely used. © 2017 IEEE.


Jaramillo M.,Technical University of the North, Ibarra | Ortiz D.,Technical University of the North, Ibarra | Ojeda D.,Technical University of the North, Ibarra
2017 IEEE Mexican Humanitarian Technology Conference, MHTC 2017 | Year: 2017

This The cognitive-behavioral psychological approach is a schematic model in crisis, associated with catastrophes, extended by its effectiveness in the world; but only practiced in the Ecuadorian private doctor's offices. Currently, the emergency brief therapy as tool for crisis interventions, is used; because that is ideal for areas associated with natural disasters. This generates an emotional imbalance in the bio-psycho-social-spiritual area, emotional autonomy and community destabilization, with big traumatic impact and of delay in the development of a country. However, there aren't researches with applied interventions cognitive-behavioral therapy in crises by disasters. In Ecuador, April 2015, there was a 7.8 Richter earthquake, located in Manabí-Esmeraldas Provinces, that generated a total devastation in the area, where the entire population obtained both material and human losses. A Crisis Government intervention model was applied, obtaining results few satisfactory. This paper present a novel model that could generate better results by ensuring a high percentage of homeostasis (emotional balance). Therefore, the result of this research could represent a challenge for clinical and/or educational psychologists with training in cognitive-behavioral therapy can empower this psychotherapeutic technique so that their results could be discussed. © 2017 IEEE.


Rodriguez-Sotelo J.L.,Autonomous University of Manizales | Peluffo-Ordonez D.H.,Technical University of the North, Ibarra | Lopez-Londono D.,Autonomous University of Manizales | Castro-Ospina A.,Metropolitan Institute of Technology
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2017

In this work, an efficient non-supervised algorithm for clustering of ECG signals is presented. The method is assessed over a set of records from MIT/BIH arrhythmia database with different types of heartbeats, including normal (N) heartbeats, as well as the arrhythmia heartbeats recommended by the AAMI, usually found in Holter recordings: ventricular extra systoles (VE), left and right branch bundles blocks (LBBB and RBBB) and atrial premature beats (APB). The results are assessed by means the sensitivity and specificity measures, taking advantage of the database labels. Also, unsupervised performance measures are used. Finally, the performance of the algorithm is in average 95%, improving results reported by previous works of the literature. © Springer International Publishing AG 2017.


Jurado F.,Autonomous University of Madrid | Meza R.E.,Technical University of the North, Ibarra
International Journal of Engineering Education | Year: 2017

When designing and developing Educational Games, the educative and ludic values they provide should be balanced. Teachers have the knowledge on designing the best learning/teaching strategies, but they are not videogame designers who know the best mechanics to engage people. Under this perspective, this paper details a proposal to develop Adaptive Educational Games that uses adaptation rules that take into account Gamer Profiles to engage students in the use of the educational tool and Learning Styles to help the system to determine the teaching/learning methods, learning-objects and learning-services that best suit each particular student. In addition, we show the exploratory case study that we developed on an Adaptive Educational Virtual World and we analyse the obtained initial results. These results show that, although most of users affirm that the provided adaption rules were right, some preferences on their Learning Styles changed due to the Virtual World features. © 2017 TEMPUS Publications.


Pais-Chanfrau J.M.,Technical University of the North, Ibarra | Trujillo-Toledo L.E.,University las Fuerzas Armadas
Biology and Medicine | Year: 2016

The methylotrophic yeast Pichia pastoris became an excellent and successfully expression system for therapeutics and other useful heterologous proteins at large-scale. Its capacity to reach a high-cell-densityconcentration during its fed-batch fermentations in a chemically-defined culture medium is one of the main features of this system. The standard culture medium BSM developed by Invitrogen Co. has been the most widespread used. However, it contains certain components in improper ratios that lead to precipitation of some of its components during preparation, mainly after sterilization and/or during pH adjustment. In this study, we propose a modified version of the BSM culture medium, named MBSM. These simple modifications by employing a linear optimization technique solves the precipitation problems observed on BSM and other culture media. Beside it, is rather simple, easy to prepare, and inexpensive, and it has impact positively over the environment by reducing the pollution load of the fermentation waste and also diminish the cost of the industrial scale fermentation process. By using this modified medium, were reached cell densities of 100 gDCW · L-1 and 60 gDCW · L-1 for mini-proinsulin and exo-levanase under the inducible AOX1 and the constitutive GAPDH promoters, respectively. These results allow to get vast amounts of proteins able to be used in nanoscience and other biotechnological applications. © 2016 Pais-Chanfrau JM, et al.


Canadas A.,Technical University of the North, Ibarra | Rade D.,Technical University of the North, Ibarra | Zambrano C.,Instituto Nacional Autonomo Of Investigaciones Agropecuarias
Revista Colombiana de Entomologia | Year: 2014

Field monitoring of Tephritidae populations is fundamental for a modern agricultural management of these insect pest species. Thus, it is necessary to collect data on environmental conditions and their fluctuations with the purpose of determining how they affect the distribution patterns of fruit flies in an important fruit production region like the Santa Elena peninsula. In this study the fruit fly populations were analyzed in relation to biotic and abiotic factors. To reach this objective, maps of land slope, floor texture and climatology were generated and overlapped with 694 georeferenced traps located in the four cardinal points of the Santa Elena region, in a study area of 3.466 ha. The results indicate that the minimum–maximum temperatures, relative humidity, and rainfall were the major climatic factors influencing fly populations dynamics. Soil texture did not have any influence on immature stages (larvae/pupae). Ceratitis capitata was common during the dry season and reached its peak at the end of it. It attacked both early and mid-season agricultural production in the study region. Anastrepha fraterculus, A. obliqua, A. serpentina, A. punensis, A. manihoti, A. chiclayae and A. pickeli, which were also collected, are native species widely distributed. Results highlight the importance of fruit fly management, which is the main limitation for the export of diverse fruits and vegetables produced in Ecuador. © 2014 The American Society for Cell Biology.


Palacios W.,Technical University of the North, Ibarra
Caldasia | Year: 2012

Four new tree species of Ecuador belonging to four families are described: Carapa amorphocarpa (Meliaceae) and Hasseltia crassa (Salicaceae) from the slopes of the Cerro Golondrinas, near the border with Colombia; Gloeospermum crassicarpum (Violaceae) from shared border of Colombia, Ecuador, and Peru; and Gyranthera amphibiolepis (Malvaceae) from the foothills of eastern Ecuador. Carapa amorphocarpa is distinguished easily by its thick leaflets with rounded or shortly emarginated apices and especially by its enormous amorphous fruits. Hasseltia crassa is distinguished by its large, coriaceous, thick leaves with deeply impressed venation and the inflorescence, which is relatively short and robust. Gloeospermum crassicarpum is characterized by the corolla, which is orange and apically curved, and the fruit, which has a thick mesocarp. Gyranthera amphibiolepis is characterized by the digitate leaves and the flowers, which are up to 8 cm in length, and have a staminal tube that shows the anthers in a similar arrangement to that of Ochroma (Malvaceae).

Loading Technical University of the North, Ibarra collaborators
Loading Technical University of the North, Ibarra collaborators