Now showing items 5650-5669 of 7745

Obese rats are more vulnerable to inflammation, genotoxicity and oxidative stress induced by coal dust inhalation than non-obese rats

Gasparotto, Juciano; Chaves Rodrigues, Paloma; Da Boit Martinello, Katia; Da Rosa Siva, Helen Tais; Bortolin, Rafael Calixto; Silva Oliveira, Luis Felipe; Rabelo, Thallita Kelly; Da Silva, Jeferson D; Da Silva, Fernanda Rabaioli; Nordin, Adriane Perachi; Soares, Karina; Borges, Malu Siqueira; Gelain, D. P; Moreira Fonseca, José Cláudio (Ecotoxicology And Environmental Safety, 2018-08-26)

Obesity is an important nutritional disorder worldwide. Its association with environmental pollution may trigger an increase in oxidative stress and inflammatory parameters. Coal is a resource used throughout the world as ...
Obesidad y aire contaminado aumentan en el riesgo de enfermedades neurodegenerativas

Solano Naizzir, Lorayne (Universidad de la Costa, 2019-09-02)

De acuerdo con la Organización Mundial de la Salud, el 97% de las ciudades con más de 100.000 habitantes en países subdesarrollados no cumplen con las guías de calidad del aire, lo que deriva en que nueve de cada diez ...
Obesity associated with coal ash inhalation triggers systemic inflammation and oxidative damage in the hippocampus of rats

Gasparotto, Juciano; Rodrigues Chaves, Paloma; Boit Martinello, Katiada; Silva Oliveira, Luis Felipe; Pens Gelain, Daniel; Fonseca Moreira, José Claudio (Universidad de la Costa, 2019)

People with large amounts of adipose tissue are more vulnerable and more likely to develop diseases where oxidative stress and inflammation play a pivotal role, than persons with a healthy weight. Atmospheric contamination ...
Obesity level estimation software based on decision trees

De-La-Hoz-Correa, Eduardo; Mendoza Palechor, Fabio; De-La-Hoz-Manotas, Alexis; Morales Ortega, Roberto; Sánchez Hernández, Adriana Beatriz (Universidad de la Costa, 2019-04-15)

Obesity has become a global epidemic that has doubled since 1980, with serious consequences for health in children, teenagers and adults. Obesity is a problem has been growing steadily and that is why every day appear new ...
Object oriented modeling frameworks for the social systems

Balaguera, M. I.; Lis Gutierrez, Jenny Paola; Gaitan, Mercedes; Viloria Silva, Amelec Jesus; Robayo Acuña, Paula Vivana (Journal of Engineering and Applied Sciences, 2017)

In the present study, an object oriented approach and modeling framework is proposed for the construction of synthetic, computational models of social systems. The conventional approach to model and study social systems ...
Objetivos en seguridad y salud en el trabajo

Universidad de la Costa (Universidad de la Costa, 2018-03-20)

Por medio del cual se aprueban los objetivos en seguridad y salud en el trabajo.
Objetos virtuales de aprendizaje como mediación didáctica para el desarrollo del pensamiento matemático en los estudiantes de la Básica Primaria

Peralta Correa, Indulain Antonio; Pérez Pérez, Diana Alejandra (Corporación Universidad de la CostaMaestría en Educación, 2021)

The purpose of this research was to analyze the contribution of Virtual Learning Objects as a didactic mediation to the development of mathematical thinking in elementary school students, it was structured under the ...
Objetos virtuales de aprendizaje como mediación didáctica para el fortalecimiento de la enseñanza aprendizaje de técnicas de instrumentación quirúrgica

Benítez M., Plácida de Jesús (Maestría en Educación, 2018-04-06)

La introducción de las Tecnologías de la Información y las Comunicaciones (TIC) en educación, y más específicamente la incorporación de Objetos Virtuales de Aprendizaje (OVA) durante el proceso de enseñanza y aprendizaje, ...
Objetos virtuales de aprendizaje para el mejoramiento de la comprensión lectora en la educación básica primaria

Pérez García, Luz Beatriz; Regino Orozco, Bleidys Marelbis (Universidad de la CostaMaestría en Educación, 2019)

The main purpose of this investigation was to determine the benefits that OVAs, as a digital teaching resource, brings in order of contributing in the strengthening of reading comprehension in primary school students. ...
Objetos virtuales de aprendizaje y su aporte al desarrollo de competencias matemáticas en la asignatura de cálculo diferencial de la Facultad de Ingeniería, CUC

Montero Muñoz, Martha Cecilia (Maestría en Educación, 2015-07-13)

Technologies of Information and Communication (ICT) in education produce changes in the teaching-learning process, especially the virtual learning objects, (OVA, for its acronym in Spanish). OVA are the digital educational ...
Objetos Virtuales de Aprendizaje y su contribución a las competencias matemáticas de los estudiantes de tercer grado

Hernandez Bent, Rosana (Universidad de la CostaMaestría en Educación - Modalidad Virtual, 2018-12-11)

One of the areas with the highest academic mortality in the educational institutions of San Andre is mathematics. Considering this problem, this article aims to show what has been the contribution of virtual learning objects ...
Oblito quirúrgico error involuntario en el ejercio de la instrumentación

Beltrán Domínguez, Leidis; Guerrero Chamorro, Liseth (Corporación Universidad de la CostaDerecho, 2021)

In surgical obligation, medical responsibility only appears in the head of the surgeon as head of the ward; that is why, the importance of evaluating the responsibility of all the participants of the surgical act, establishing ...
Obra arquitectónica reflejo de una forma de vida

Diazgranados, Erica (Corporación Universidad de la CostaPaperwork, 2021)

La arquitectura a lo largo del tiempo se ha visualizado como el arte de generar espacios dignos de habitar, dentro de este arte se encuentran diversas variables y factores que influyen con cada parte de la obra que se vaya ...
Obras de la I Exposición artística en BiblioUnicosta

Corporación Universidad de la Costa (Corporación Universidad de la Costa, 2022-03-07)

La biblioteca de la Universidad de la Costa inauguró la 1era exposición artística que estará disponible para el público y comunidad universitaria, del 7 hasta el 25 de marzo del año en curso. Esta iniciativa corresponde a ...
La observación de situaciones cotidianas, estrategia didáctica para desarrollar competencias científicas

Orozco Polo, Álvaro Antonio; Padilla Sampayo, Luis Carlos (Maestría en Educación, 2017-11-21)

The development of scientific competences is one of the great challenges that teachers must face, so this research intends to associate tasks, observations, understanding everyday events and the development of ...
Obtención de abono orgánico líquido a partir de la digestión anaeróbica de la planta acuática invasora ¨eichhornia crassipes¨ (taruya) a través de un biodigestor

Suarez Marenco, Maria Karina (Ingeniería Ambiental, 2016-10-11)

The present project there consisted of the obtaining of organic liquid credit from the ¨Eichhornia crassipes ¨ known with Taruya's common name, which is an invading water plant and is considered to be one of 100 more harmful ...
Obtención de Curvas de Carga de transformadores de Distribución mediante la Facturación Estudio de Caso

Sierra Gil, Eduardo; Basulto Espinosa, Alfredo; Rodríguez Medina, Manuel (Corporación Universidad de la Costa, 2014-12-31)

Este trabajo se realiza a partir de una solicitud de la Empresa Eléctrica Municipal de Camagüey y tiene como objetivos caracterizar a los clientes del sistema de distribución del municipio y evaluar un método para la ...
Obtención de mezclas de concreto a partir de la utilización del vidrio como agregado grueso

Mejía Ojeda, Arnaldo Eliecer (Corporación Universidad de la CostaIngeniería Civil, 2009-10-17)

Esta investigación implementará una base de hormigón de vidrio reciclado. Con este nuevo intento de dar un nuevo significado a las obras civiles, pensando en el medio ambiente y aportando avances significativos en la ...
Obtención de morteros pigmentados a base de óxidos de hierro naturales

Romero Morales, Isaías José; Rocha Cárcamo, Andreína (Universidad de la CostaIngeniería Civil, 2019-08)

The use of rust residues is of great importance in the field of construction, which is why one of the aspects to be taken into account in pigment mortars is durability, which can be affected by the environment where the ...
Obtención de quitosano por medio de escamas de pescado para tratamiento de agua potable

Cruz Jiménez, Keila Isabel (Corporación Universidad de la CostaIngeniería Ambiental, 2021)

In this work, the coagulant properties of chitosan were investigated, finding that it is a linear cationic polymer, biodegradable, with excellent characteristics as a coagulant, due to the presence of amino groups in its ...

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Obese rats are more vulnerable to inflammation, genotoxicity and oxidative stress induced by coal dust inhalation than non-obese rats
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Gasparotto, Juciano | 2018-08-26

Obesity is an important nutritional disorder worldwide. Its association with environmental pollution may trigger an increase in oxidative stress and inflammatory parameters. Coal is a resource used throughout the world as an important fuel source for generating electricity. The ashes released by the coal combustion cause serious problems for human health due to their high toxicity and their capacity to bioaccumulate. The aim of this work was to investigate the effects of coal dust inhalation in the organs of obese and non-obese Wistar rats. Pro-inflammatory cytokines, oxidative stress, oxidative damage, histological analysis, comet assay, and micronuclei were investigated. Both obesity and coal dust inhalation increased the pro-inflammatory cytokines IL-1β and TNF-α and decreased HSP70 levels in serum, however, in obese animals that inhaled coal dust these changes were more pronounced. Liver histological analysis showed severe microvesicular steatosis in obese animals that inhaled coal dust. Lung histologic investigation showed abnormalities in lung structure of animals exposed to coal dust and showed severe lung distensibility in obese animals exposed to coal dust.

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Obesidad y aire contaminado aumentan en el riesgo de enfermedades neurodegenerativas
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Solano Naizzir, Lorayne | 2019-09-02

De acuerdo con la Organización Mundial de la Salud, el 97% de las ciudades con más de 100.000 habitantes en países subdesarrollados no cumplen con las guías de calidad del aire, lo que deriva en que nueve de cada diez personas de la población mundial inhalan aire contaminado. Por otro lado, según la misma entidad, en 2016 alrededor del 13% de la población adulta mundial (11% de los hombres y el 15% de las mujeres) presentaba obesidad, una cifra que está en aumento.

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Obesity associated with coal ash inhalation triggers systemic inflammation and oxidative damage in the hippocampus of rats
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Gasparotto, Juciano | 2019

People with large amounts of adipose tissue are more vulnerable and more likely to develop diseases where oxidative stress and inflammation play a pivotal role, than persons with a healthy weight. Atmospheric contamination is a reality to which a large part of the worldwide population is exposed. Half of today's global electrical energy is derived from coal. Each organism, in its complexity, responds in different ways to dietary compounds and air pollution. The objective of this study was to investigate the effects of obesity and coal ash inhalation within the parameters of oxidative damage and inflammation in different regions of the brain of rats. A diet containing high-fat concentration was administered chronically to rats, along with exposure to coal ash, simulating the contamination that occurs daily throughout human life. High-resolution transmission electron microscopy was performed to identify the particles present in coal ash samples. Our results demonstrated that obese rats exposed to coal ash inhalation were more affected by oxidative damage with subsequent systemic inflammation in the hippocampus. Since there is an inflammatory predisposition caused by obesity, the inhalation of nanoparticles increases the levels of free radicals, resulting in systemic inflammation and oxidative damage, which can lead to chronic neurodegeneration.

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Obesity level estimation software based on decision trees
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De-La-Hoz-Correa, Eduardo | 2019-04-15

Obesity has become a global epidemic that has doubled since 1980, with serious consequences for health in children, teenagers and adults. Obesity is a problem has been growing steadily and that is why every day appear new studies involving children obesity, especially those looking for influence factors and how to predict emergence of the condition under these factors. In this study, authors applied the SEMMA data mining methodology, to select, explore and model the data set and then three methods were selected: Decision trees (J48), Bayesian networks (Naïve Bayes) and Logistic Regression (Simple Logistic), obtaining the best results with J48 based on the metrics: Precision, recall, TP Rate and FP Rate. Finally, a software was built to use and train the selected method, using the Weka library. The results confirmed the Decision Trees technique has the best precision rate (97.4%), improving results of previous studies with similar background.

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Object oriented modeling frameworks for the social systems
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Balaguera, M. I. | 2017

In the present study, an object oriented approach and modeling framework is proposed for the construction of synthetic, computational models of social systems. The conventional approach to model and study social systems will be reviewed and outlined, indicating its limitations to deal with their associated complex turbulent phenomena. The proposed object oriented integrative modeling will be explained emphasizing its advantages compared to reductionist methods when dealing with complex systems. Finally, the main architecture of the UTOPIA computational modeling framework, an ongoing, development is shown and described.

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Objetivos en seguridad y salud en el trabajo
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Universidad de la Costa | 2018-03-20

Por medio del cual se aprueban los objetivos en seguridad y salud en el trabajo.

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Objetos virtuales de aprendizaje como mediación didáctica para el desarrollo del pensamiento matemático en los estudiantes de la Básica Primaria
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Peralta Correa, Indulain Antonio | 2021

The purpose of this research was to analyze the contribution of Virtual Learning Objects as a didactic mediation to the development of mathematical thinking in elementary school students, it was structured under the complementary emerging paradigm; a mixed descriptive-explanatory research approach and a pre-experimental research design, with a single group of 24 students from grade 5, of the I.E. Nuestra Señora de la Asunción de Fresno-Tolima, to whom a questionnaire is applied in order to identify the needs and expectations regarding the use of ICT during a process of teaching and learning mathematics; a pre-test test to diagnose the level of mathematical thoughts, from which an offline OVA was designed and applied, and finally, a standardized post-test was applied and whose results were compared with the results obtained in the pre-test, it was demonstrated that the students developed mathematical thinking, with an increase in the components: numerical-variational from 41% to 55%; random from 48% to 62% and metric-geometric from 36% to 55%; while mathematical competencies: reasoning from 38% to 58%, communication 42% to 56% and problem solving from 42% to 61%. It is concluded that the inclusion of OVAs as a didactic mediation contributes to the development of mathematical thinking, enabling the strengthening of components and competencies.

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Objetos virtuales de aprendizaje como mediación didáctica para el fortalecimiento de la enseñanza aprendizaje de técnicas de instrumentación quirúrgica
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Benítez M., Plácida de Jesús | 2018-04-06

La introducción de las Tecnologías de la Información y las Comunicaciones (TIC) en educación, y más específicamente la incorporación de Objetos Virtuales de Aprendizaje (OVA) durante el proceso de enseñanza y aprendizaje, trae múltiples beneficios a estudiantes y docentes, entre ellos la dinamización de estrategias innovadoras y el desarrollo de competencias en educación superior. El presente trabajo de investigación tuvo como propósito determinar la contribución de los Objetos Virtuales de Aprendizaje, como medicación didáctica para el fortalecimiento de la enseñanza aprendizaje de técnicas de Instrumentación Quirúrgica en el Programa de Instrumentación Quirúrgica de la Universidad Latinoamericana de la Costa (CUL). La investigación se trabajó bajo un enfoque cuantitativo de tipo descriptiva, con un diseño cuasi experimental, se fundamenta en la teoría de la mediación, el construccionismo social y en la teoría de humanidades digitales, esta última enfatiza en la convergencia entre las humanidades y la informática durante un proceso de aprendizaje. Los resultados alcanzados permiten afirmar que la incorporación educativa de los OVA para el aprendizaje de técnicas de instrumentación quirúrgica, se constituye en una estrategia didáctica innovadora que fortalece las competencias específicas, las habilidades prácticas del instrumentador quirúrgico. Como conclusión se puede afirmar que la OVA diseñada y aplicada incrementó en un 30% el desempeño académico de los estudiantes en el manejo de técnicas de instrumentación quirúrgica, evidenciado en el aumento del promedio académico logrado por los estudiantes y después de la aplicación del OVA. Los estudiantes valoran positivamente el uso de OVA en el proceso de aprendizaje, sin embargo, señalaron algunas falencias en su aplicación, bien sea por parte del proceso de enseñanza o por la disponibilidad de recursos tecnológicos.

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Objetos virtuales de aprendizaje para el mejoramiento de la comprensión lectora en la educación básica primaria
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Pérez García, Luz Beatriz | 2019

The main purpose of this investigation was to determine the benefits that OVAs, as a digital teaching resource, brings in order of contributing in the strengthening of reading comprehension in primary school students. The investigation was focused under a quantitative approach and descriptive - explanatory type, with a quasi-experimental design. The statistical population was constituted by fifty-two third-grade students from the Luruaco Agricultural Technical Institution, where twenty-six of the students belonged to the control group and the other twenty-six students were part of the experimental group, who were intervened with the proposed strategy. An observation sheet was used as instruments with previous established criteria that allowed quantifying using a Lickert´s frequency scale, how favorable or unfavorable the students' attitude was towards the OVA. Also, a questionnaire was applied in two moments of the investigation (pre-test and post-test) in order to identify the reading comprehension level of the population under study. For the result analysis, the program SPSS was applied to process the obtained data, where a remarkable difference between the two groups was observed, verifying the effectiveness and relevance of theories that support the present investigation in terms of reading and in lecture comprehension terms, also in terms of ICT and the use of OVA. Finally, it is concluded that the use of OVA affects positively in the strengthening of students' reading comprehension.

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Objetos virtuales de aprendizaje y su aporte al desarrollo de competencias matemáticas en la asignatura de cálculo diferencial de la Facultad de Ingeniería, CUC
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Montero Muñoz, Martha Cecilia | 2015-07-13

Technologies of Information and Communication (ICT) in education produce changes in the teaching-learning process, especially the virtual learning objects, (OVA, for its acronym in Spanish). OVA are the digital educational resources that enhance the development of skills of the students, because they capture their attention and interest during their formation process through educational materials in different formats: visual, audio, interactive multimedia animations, etc. In this respect and wanting to strengthen learning differential calculus at Corporación Universitaria de la Costa (CUC), the research proposed in this paper is relevant. It seeks to answer the question “What is the contribution of virtual learning objects to the development of mathematical skills of students in the course of differential calculus at Corporación Universitaria de la Costa (CUC)? For this purpose, the contribution of the OVA in the development of mathematical skills of students was examined, identifying the technical and functional features of OVA, and determining the specific skills defined in the course of Differential Calculus that students have to develop. In this research was used the emerging paradigm which arises from the combination of two qualitative and quantitative approaches, combining and mixing them throughout the process of problematization, collection and analysis of data. Therefore, in this research, the predominance of qualitative approach was sought, since despite the quantitative data required for the analysis, the basis of the inquiry lies in the exploration and understanding of the phenomenon studied for its interpretation. This research project seeks to identify the technical and functional learning objects features, as well as determining the specific competences defined in the course of Differential Calculus to be developed by students through the document review and participant observation to discover, interpret and conclude on the contribution that the OVA do to the development of the mathematical skills of students in the mentioned course. In addition to the foregoing, interesting results were thrown. Those results were evidenced by measuring instruments such as observation sheet, institutional rubric, diagnostic test and final test, analysis of the positive and motivating reaction showed by students while using the OVA, where traditionally they had difficulties in modelling and understanding of concepts, problem solving and graphics. This proves the incidence existing between the learning process and the using of OVA, which ensures an improvement in academic performance and mathematical skills development, without discrediting the importance of teacher’s mediation as a guiding element.

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Objetos Virtuales de Aprendizaje y su contribución a las competencias matemáticas de los estudiantes de tercer grado
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Hernandez Bent, Rosana | 2018-12-11

One of the areas with the highest academic mortality in the educational institutions of San Andre is mathematics. Considering this problem, this article aims to show what has been the contribution of virtual learning objects in the teaching of mathematics to students of the educational institutions Brooks Hill Bilingual School and Flowers Hill Bilingual School of San Andres, Islands. The study is structured as follows: description of the research problem, theoretical and conceptual review through a framework of reference, the methodological aspects and the presentation, interpretation and analysis of the results. It is concluded that the pedagogical accompaniment with the use of virtual learning objects, for the acquisition of mathematics for third grade students, is an effective educational strategy, which favors the acquisition of mathematical concepts in students, improving interest in the subject and favoring the conditions for their learning

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Oblito quirúrgico error involuntario en el ejercio de la instrumentación
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Beltrán Domínguez, Leidis | 2021

In surgical obligation, medical responsibility only appears in the head of the surgeon as head of the ward; that is why, the importance of evaluating the responsibility of all the participants of the surgical act, establishing who is responsible and who should compensate the damage. It is evident that in the presence of a surgical oblite there is a person in charge who has the obligation to repair the damage caused, also that the instrumenter's own function consists mainly of supervising the surgical medical equipment and materials that enter the surgery room. ; This being true, the assessment of responsibility should not only be directed towards the surgeon, but also towards the instrumenter and the surgical team. In this work the surgical oblite will be analyzed as an involuntary error in the exercise of surgical instrumentation and the factors that increase the risk of forgetting foreign bodies in the body of patients during a surgical intervention will be identified. This research will be of a socio-legal nature and will be carried out under the aspect of a documentary and hermeneutical study. It is concluded that the proper function of the instrumenter consists mainly in supervising the surgical medical equipment and materials that enter the operating room; This being true, the assessment of responsibility should not only be directed towards the surgeon, but also towards the surgical instrumenter and the surgical team.

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Obra arquitectónica reflejo de una forma de vida
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Diazgranados, Erica | 2021

La arquitectura a lo largo del tiempo se ha visualizado como el arte de generar espacios dignos de habitar, dentro de este arte se encuentran diversas variables y factores que influyen con cada parte de la obra que se vaya a ejecutar, el nacimiento de la idea se considera uno de los instantes más preciados, pero a la vez mas confusos a la hora de concebir un proyecto arquitectónico. La idea, es solo eso, un pensamiento recurrente que dirige al arquitecto a generar o a plasmar un sentimiento sobre un pedazo de papel. (Machado Penso, 2018)A partir de ahí, se le da inicio al proceso de creación. Inician los trazos, bocetos, garabatos que usualmente pueden llegar a parecer líneas vacías, pero que realmente representan uno de los momentos más importantes dentro del proceso de creación y proyección de un futuro proyecto arquitectónico.

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Obras de la I Exposición artística en BiblioUnicosta
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Corporación Universidad de la Costa | 2022-03-07

La biblioteca de la Universidad de la Costa inauguró la 1era exposición artística que estará disponible para el público y comunidad universitaria, del 7 hasta el 25 de marzo del año en curso. Esta iniciativa corresponde a la alianza ‘Amigos de la biblioteca’, que propone una reflexión, acercamiento y disfrute de exposiciones artísticas programadas periódicamente.

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La observación de situaciones cotidianas, estrategia didáctica para desarrollar competencias científicas
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Orozco Polo, Álvaro Antonio | 2017-11-21

The development of scientific competences is one of the great challenges that teachers must face, so this research intends to associate tasks, observations, understanding everyday events and the development of scientific competences. Comparing and analyzing the results obtained; It is found that the strategy favorably influences the development of scientific competences. Therefore, it is concluded that the main elements that can mediate this process are oriented towards situations that show students their own contexts, experiences, cases and anecdotes, generating cognitive conflicts and thus be able to look for the proposed objectives, assuming sequences to solve problems. These steps or stages can be achieved under schemes of pedagogical acts that contain a sequence of teaching and learning (SEA), which according to Caamaño (2011) is the planning of the process to teach and learn. The findings are based on the theory of Cognitive Mediation, proposed by Feuerstein, 1988, 1991; giving relevance to previous experiences (the observation of everyday situations) in their new one, which should be activated when combined with didactic strategies, typical of constructivist and activist approaches. (Castillo, 2008), De Zubiría (2006). And that for the development of teaching-learning processes, it is fundamental to incorporate the context in which the student develops from the field of everyday life, (López de Maturana, 2015)

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Obtención de abono orgánico líquido a partir de la digestión anaeróbica de la planta acuática invasora ¨eichhornia crassipes¨ (taruya) a través de un biodigestor
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Suarez Marenco, Maria Karina | 2016-10-11

The present project there consisted of the obtaining of organic liquid credit from the ¨Eichhornia crassipes ¨ known with Taruya's common name, which is an invading water plant and is considered to be one of 100 more harmful species of the world according to the commission for the environmental cooperation (2008), due to the fact that for his mechanisms of reproduction there propagates rapidly for the water bodies, which brings as consequences affectations at the social level, economically and environmental. The population of study of the project was Sabanagrande's municipality due to the affectations that the taruya has been causing in the marsh of the same name. For the production of the organic credit a biodigestor was in use type Batch which consists of a hermetic tank where there was carried out the process of anaerobic digestion of the taruya. The experimental development consisted of the compilation of Taruya's samples of Sabanagrande's marsh, later one proceeded to the sample preparation to load the biodigestor and to put it in operation. A plan of follow-up was elaborated for the control of the parameters of operation of the biodigestor principally of the pH, temperature and time of retention. On the other hand the population was realized encuetas near to Sabanagrande's marsh in order to obtain information of the affectations of the Taruya. The process of obtaining of organic credit hard liquid approximately two months, the obtained results were compared with the NTC 5167 of 2011 for products of the agricultural industry, obtaining so the credit might be applied in the soils.

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Obtención de Curvas de Carga de transformadores de Distribución mediante la Facturación Estudio de Caso
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Sierra Gil, Eduardo | 2014-12-31

Este trabajo se realiza a partir de una solicitud de la Empresa Eléctrica Municipal de Camagüey y tiene como objetivos caracterizar a los clientes del sistema de distribución del municipio y evaluar un método para la obtención de las curvas de carga de los transformadores de distribución a partir de los clientes asociados al mismo, mediante técnicas estadísticas, comparando la curva obtenida a través del método propuesto con mediciones realizadas a una muestra seleccionada de transformadores. En el artículo se presentan los resultados de la comparación de las medias y las desviaciones estándar, demostrándose que no existen diferencias significativas entre las curvas obtenidas por agregación de curvas de clientes y la curva obtenida por medición.

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Obtención de mezclas de concreto a partir de la utilización del vidrio como agregado grueso
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Mejía Ojeda, Arnaldo Eliecer | 2009-10-17

Esta investigación implementará una base de hormigón de vidrio reciclado. Con este nuevo intento de dar un nuevo significado a las obras civiles, pensando en el medio ambiente y aportando avances significativos en la fabricación de hormigón con diferentes materiales o tradicionales. Con la fabricación de este tipo de concreto, los tipos de obras civiles, principalmente aquellas que favorecen a las comunidades más pobres, ya que podrían utilizar material reciclado en la fabricación de unidades de albañilería para permitir la construcción de viviendas sociales que involucren a la comunidad en campañas de reciclaje, y obtener Las cantidades de vidrio requeridas para la preparación de tales mezclas. Este tipo de concreto ha sido poco investigativo y este proyecto proporcionaría y marcaría el inicio de un proceso de investigación en el país relacionado con el concreto hecho con vidrio reciclado. La investigación fue un concreto, a partir de dos diseños de mezclas diferentes, incorporando vidrio en lugar de agregado grueso, cemento, agregado fino y agua. Para lograr este nuevo concreto se llevan a cabo una serie de pruebas de cilindros de concreto en tamaños y procedimientos estándar que cumplen con los estándares INVIAS, NTC y NRS 98. Los estándares utilizados, sugerimos el uso de curvas de características granulométricas, que se tomaron como referencia para controlar los materiales utilizados por nosotros en las mezclas utilizadas. Las curvas características se toman en Colombia, inicialmente plantadas por Fuller y Thomson y posteriormente modificadas por Bolomey. Para el vidrio, no tenía ninguna referencia previa, por esta razón, la curva de clasificación del vidrio se recolectó utilizando una prueba de clasificación convencional. Una vez que conocemos las características de cada material, se prepararon dos diseños de mezcla que cumplen con las regulaciones necesarias. Con estos diseños se realizaron después de que las muestras se analizaran probando la resistencia a la compresión en el laboratorio y, por lo tanto, se conoce la resistencia a la llegada de los diseños propuestos. Los diseños de mezcla propuestos fueron 2500 y 3000 psi, respectivamente, y los resultados fueron aproximados a esa propuesta.

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Obtención de morteros pigmentados a base de óxidos de hierro naturales
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Romero Morales, Isaías José | 2019-08

The use of rust residues is of great importance in the field of construction, which is why one of the aspects to be taken into account in pigment mortars is durability, which can be affected by the environment where the product is applied . In this investigation, the compressive strength of mortars with traditional pigments and with natural iron oxides is evaluated, where it is evident that the addition of natural iron oxide does not cause any alteration in the mortar resistance parameter, compared to the parameter of resistance of the traditional mortar with synthetic pigment where a variation is observed in the 3rd day of curing and a decrease in the 7 day with respect to its resistance. The analysis by DRX shows us the phases present in P1 (Pigment of natural iron oxide) showing in greater proportion the Magnetite phase with a percentage of 53.8% followed by Monetite with 26.7% and Hedenbergite-Jadeite with 19.3%, presenting in smaller proportion the Halite potassian phase with 0.2%, unlike the P2 sample (synthetic pigment), which has the Magnetite phases in a greater proportion with a percentage of 37.9%, followed by Hematite with 25.6%, Quartz low with 14.6 %, Goethite with 11.2%, Annite with 7.4% and in its lowest percentage Birnessite, sodian with 3.4%.

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Obtención de quitosano por medio de escamas de pescado para tratamiento de agua potable
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Cruz Jiménez, Keila Isabel | 2021

In this work, the coagulant properties of chitosan were investigated, finding that it is a linear cationic polymer, biodegradable, with excellent characteristics as a coagulant, due to the presence of amino groups in its structure that confer the ability to reduce the presence of colloids in water. Thus, the objective of the present work was to prepare a natural coagulant from chitosan, originating from fish scales of the Mojarra Lora (Oreochromis niloticus), by the homogeneous chemical method. First, the chitin was separated from the scales, through depigmentation, deproteinization, demineralization and deacetylation processes (obtaining chitosan); Which had a yield in the process of 78%, 78.20%, 88.752% and 30% respectively. To verify the efficiency of the procedure, the structure of the chitosan obtained was characterized, where a degree of DD (76.87%), proteins (<2.45%) and ashes (40.52%) were obtained by potentiometric titration. Said results obtained are theoretically compared with different types of coagulants, both of commercial origin, and obtained experimentally, by other authors; In both cases, the chitosan obtained from Mojarra Lora (Oreochromis niloticus), has shown favorable results in the different processes that have been compared. By applying the chitosan obtained, as a coagulant to the water treatment, different jar tests were developed to obtain the optimal dose of coagulant (300mg / l) and the flocculation time (30 min). These variables were subjected to an ANOVA statistical analysis, which indicates that the coagulant dose and flocculation time do significantly affect (p-value <0.05) on the removal of turbidity from the water; Thus, obtaining a decrease in turbidity of 76.30%, so it can be inferred that the coagulant performance and the parameters to be determined were optimal. However, when comparing the values obtained for turbidity and final color, with the maximum permissible limits of resolution 2115 of 2007 regulation of water quality for human consumption, the average turbidity obtained was 79.1 NTU and 370 UPC for color, exceeding the permissible limits. Because the coagulant is not totally removing the impurities present in the water sample from the Magdalena River to be studied; It is recommended before using the coagulant, to carry out a sweep to eliminate impurities, in addition to improving the deacetylation stage, to obtain a purer chitosan (higher degree of DD) and thus be able to obtain a better performance of the coagulant and therefore a yield greater in the removal of turbidity and color.

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