Universidad Pedagogica Nacional (Colombia)
Recent publications
Este artigo refere-se a um estudo embasado pela pesquisa qualitativa, com abordagem fenomenológica e hermenêutica, tendo como questão de pesquisa: o que é isso que se mostra de Educação Ambiental Crítica e Transformadora nas narrativas acerca do contexto escolar brasileiro e colombiano? O objetivo da pesquisa intentou compreender como a Educação Ambiental Crítica e Transformadora se mostra nas escolas da Educação Básica, em diferentes lugares socioespaciais no Brasil e na Colômbia. Para a produção dos dados foram utilizadas entrevistas narrativas, sendo analisadas pela abordagem da Análise Textual Discursiva (MORAES; GALIAZZI, 2016). Desse modo, a partir de uma categoria emergente, apresentamos o metatexto intitulado: A formação inicial e continuada de professores: os projetos escolares como possibilidade de transversalizar a Educação Ambiental. A relevância social desta pesquisa consiste em potencializar e instrumentalizar a práxis de Educação Ambiental Crítica e Transformadora, a partir de projetos escolares no cotidiano escolar, por meio da formação de professores, tanto no Brasil como na Colômbia.
Some of the diverse agro-industrial waste generated in primary or secondary stages have proved to be promising biomaterials for treating aqueous effluents contaminated, in this case, with heavy metals. Therefore, it is necessary to know their optimal operating conditions and the regeneration or reusability of the solid by-product, an aspect related to desorption. Considering the above, this article presents the findings of a preliminary study related to the desorption process of coffee pulp without physicochemical modification (Castilla variety), an agricultural waste used as a sorbent of Cr(III and VI) ions in synthetic wastewater. The desorption efficiency of four eluting agents at defined concentrations (0.10M)—HC1, HNO3, H2SO4, and EDTA—was evaluated in a time interval of 1 to 9 days. Likewise, the proposals for the sorption and/or desorption mechanisms proposed and reported in the literature with respect to the use of biosorbents derived from the coffee crop are presented. With respect to the results, the coffee pulp used in previous studies of the adsorption of chromium species mentioned (optimal conditions in synthetic water of particle size 180 μm, dose 20 g·L−1, agitation 100 RPM, room temperature, time of 90 to 105 min) showed efficiencies in the removal of Cr(III) and Cr(VI) of 93.26% and 74.80%, respectively. Regarding the extracting substances used, H2SO4 0.10 M was the one that presented the highest desorption percentage in both chromic species, with a desorption of 45.75% Cr(VI) and 66.84% Cr(III) in periods of 5 and 9 days, respectively, with agitation of 100 RPM and room temperature. Finally, the dissemination of preliminary results on the desorption of coffee pulp contaminated with chromic species without physicochemical modification is novel in this study, as similar work with this specific material has not yet been reported in the literature. On the other hand, the limitations of the study and future research are related to the evaluation at different concentrations and of other extractor solutions that allow improving the efficiency of desorption of these chemical species in a shorter time from the coffee pulp (with and without modification) as well as the reuse cycles. As a result, the desorption of coffee pulp used as an adsorbent material in real water could help researchers identify the possible interfering factors that affect the process (foreign anions and cations, organic matter, environmental conditions, among others).
One of the environmental challenges that is currently negatively affecting the ecosystem is the continuous discharge of untreated industrial waste into both water sources and soils. For this reason, one of the objectives of this qualitative study of exploratory-descriptive scope was the review of scientific articles in different databases—Scopus, Web of Science, and Science Direct—published from 2010 to 2021 on the use of fruit peels as a sustainable waste in the removal of heavy metals present in industrial wastewater. For the selection of articles, the authors used the PRISMA guide as a basis, with which 210 publications were found and 93 were compiled. Considering the reported work, a content analysis was carried out using NVivo 12 Plus and VOSviewer 1.6.17 software. The results show that the fruits mentioned in these publications are lemon, banana, mango, tree tomato, pineapple, passion fruit, orange, coconut, avocado, apple, lulo, and tangerine. However, no studies were found with lulo and tree tomato peels. On the other hand, the heavy metals removed with the selected fruit peels were Pb+2, Cr+3, Cr+6, Ni+2, Cd+2, As+5, Cu+2, and Zn+2.
El objetivo del siguiente articulo de reflexión es abordar la propuesta de educación en ciudadanía de la filósofa Teresa Yurén a partir del análisis de las dinámicas sociales, económicas y políticas actuales de la modernidad liquida. Para ello la reflexión se aborda desde dos líneas: primero, se exponen las consecuencias de la mercantilización de la política y de la vida en la educación la y la formación ciudadana y, segundo, se aboga por una restructuración de lo público y una recuperación de la participación política deliberativa como estrategia de acción ciudadana y consciente.
Se reportan los resultados de una investigación en la cual se analizan textos empleados en la fundamentación lingüística de estudiantes de pregrado. Se examinaron textos provenientes de los paradigmas estructuralista, generativista y enunciativo (discursivo). Se diseñó una matriz de análisis que registra información en tres dimensiones: semántica, retórico-explicativa y cognitiva. Se estableció que los textos comportan preferentemente secuencias explicativas y, dentro de ellas, se dedica más atención a la resolución del problema de estudio. La estrategia discursiva más frecuente es la aseveración, seguida por la ejemplificación y la cita de autor. En cuanto a la referencia cognitiva, en los textos del estructuralismo y del generativismo se presenta un equilibrio entre la simbolista y la experiencialista; en los del paradigma enunciativo (discursivo) se acude preferentemente a la referencia simbólica. La propuesta brinda puntos de partida para caracterizar este tipo de textos y examinar la incidencia de sus propiedades en los procesos de comprensión lectora.
Heterosexism in psychological education and training showed differential two group (heterosexual/LGQ+ self-identification) strategies to improve LGBTQ+ affirmative healthcare. The results of mixed lexicographic/in deep qualitative approach on interviews conducted to 27 psychologists working as healthcare providers in Colombia displayed a core vocational synchronicity and recognition of heteronormativity structures; differential practices oriented to activism and self-learning strategies mediated by firsthand involvement in social changes oriented to LGBTQ+ rights are discussed. Three core components for update professional LGBTQ+ education and training are suggested.
Resumen El ingreso de la vida en la política y el posicionamiento del Estado nación como forma de ordenamiento político y social hicieron de la educación un escenario fundamental en la consolidación, perfeccionamiento y desarrollo de las emergentes mecánicas del poder. Asimismo, los aparatos educacionales operaron decididamente en la fijación de la idea del bien común como horizonte de normalización. Ante la creciente amplitud de estudios y apropiaciones de las nociones foucaultianas en este escenario, se hace urgente adelantar un rastreo documental en torno al uso de las nociones de disciplina y biopolítica a fin de examinar las relaciones entre la institución del Estado como aparato de gobierno de la vida en la modernidad y la expansión de la maquinaria educacional.
Actualmente existen varias estrategias para consultar información en la red en tiempo real sobre infinidad de temas, tanto asuntos de la cotidianidad de las personas como de campos del saber que son de interés para la comunidad académica. Las bases de datos se constituyen como herramientas eficientes para la trasmisión de información y su acceso, en general, resulta sencillo y rápido; sin embargo, en ocasiones estudiantes y docentes no las emplean con la frecuencia que se desearía, fenómeno del que se desconocen en gran medida las causas. El objetivo del presente trabajo fue indagar las percepciones de docentes y estudiantes de una Facultad de Odontología en Bogotá, en cuanto al uso de las bases de datos en investigación formativa, empleando la técnica de Clasificación Múltiple de Ítems –CMI-. Se pudo identificar que para la mayoría de los participantes se hace necesario implementar estrategias pedagógicas que promuevan el uso de estas; adicionalmente los participantes reconocen la importancia de los diferentes actores en el proceso enseñanza-aprendizaje y de la inclusión de las bases de datos en las diferentes actividades académicas e investigativas.
En el presente artículo, argumentaremos que es posible encontrar en el clásico filósofo y maestro zen japonés Eihei Dōgen (1200-1253) una muy significativa contribución a nuestros esfuerzos por enfrentar la problemática ambiental y social de nuestro tiempo. Esta contribución consiste en una perspectiva a partir de la cual sea posible reconectar la subjetividad humana con el entorno y con los otros. Así, sería posible superar la tendencia del sujeto moderno al autoconfinamiento (cerrarse sobre sí mismo), tendencia que está en la raíz de realidades que han alimentado la crisis socioambiental en nuestra era, como el individualismo en general, y el consumismo en particular. Para desarrollar la idea central del texto, procederemos en cuatro pasos. Primeramente, precisaremos el sentido del autoconfinamiento al que tiende la subjetividad moderna y su carácter de condición esencial para la emergencia de la crisis socioambiental que actualmente enfrenta la humanidad. Enseguida, examinaremos la salida del autoconfinamiento desde Dōgen y cómo a partir de él se puede configurar una forma de subjetividad conectada: el sujeto se configura no en oposición al resto de la realidad, sino en radical conexión y sintonía con la realidad circundante. En tercer lugar, mostraremos que la sintonía en la base de la subjetividad conectada se puede evidenciar en la experiencia estética del ambiente: el apercibirse concretamente del ambiente es la ocasión para que el individuo descubra quién es. Finalmente, desde tal perspectiva sugeriremos eventuales vías para poner en acto esta constitución conectada de la subjetividad que permitan afrontar la crisis socioambiental.
Los bosques de galería de la Orinoquía Colombiana han sufrido fuertes procesos de fragmentación, lo cual ha afectado su fauna y especialmente las poblaciones de primates. Sin embargo, el estudio de los mamíferos es, en extremo, complejo y costoso. Utilizando la estrecha relación que existe entre la diversidad y abundancia de los mamíferos y los escarabajos coprófagos, se propone utilizar este grupo como una herramienta para evaluar este efecto. Buscando entender cómo el tamaño de los fragmentos y las poblaciones de primates se relacionan con la diversidad y estructura del ensamblaje de escarabajos coprófagos, se realizó un estudio en cuatro fragmentos de diferente tamaño. Se ubicaron transectos lineales de trampas de caída cebadas con excremento. Se evaluó la diversidad y estructura del ensamblaje y se realizó un análisis de varianza para determinar diferencias entre los fragmentos. Se colectaron 1172 individuos, 18 especies y 11 géneros. Se evidenció una disminución en la riqueza, abundancia y número de grupos funcionales desde el fragmento más grande (17 spp.) hacia el más pequeño (7 spp.). La baja riqueza encontrada, indicaría un efecto negativo de la fragmentación, donde el tamaño de los bosques es crítico para mantener su diversidad. Los fragmentos pequeños no logran mantener la diversidad ni estructura funcional, presentándose la desaparición de grandes paracópridos y telecópridos, evidenciándose que los escarabajos son un eficiente indicador de los efectos antrópicos en este ecosistema. Finalmente, concluimos que los fragmentos de bosque de galería de la Orinoquía colombiana constituyen un refugio faunístico que es necesario conservar.
Users of online collaborative social networks (e.g., StackExchange, Yahoo! Answers, and Yask, among others) are distributed across a continuous range of expertise, ranging from beginners to experts. However, only a minority of users contribute to their communities by posting questions and answers, while the majority (lurkers) only contribute by voting up or down on others’ posts. Since current methods for ranking expertise are based mainly on user submitted posts, their results are limited to that minority. We introduce ProficiencyRank, a wrapping method on top of PageRank that leverages voting information to determine user expertise for both contributors and lurkers. We validated our method to measure the proficiency of English Language Learners in the Yask social network. The new data set is naturally annotated with self-assessments of proficiency given by the users themselves, providing ground truth for all users. Experimental validation showed that ProficiencyRank produces a meaningful ranking of users that overcame various baselines based on intrinsic and extrinsic information. We conclude that this technology can benefit these communities by expanding the coverage of user expertise/reputation measurement and providing a re-ranking method for the expert finding task.
We provide a descriptive study on the participation of women throughout the 70-year history of Ideas y Valores. We describe the historical progression of the gender proportion in the publication of texts, the behavior of female authors according to types of texts, and the impact of the inclussion of the journal in indexes on gender proportion. We offer a characterization of female authors according to the types of texts they publish, the country of their reported institution, and their topics of research. We also describe participation of women as authors of reviewed books and texts put into dialogues. Finally, we offer a comprehensive list of text authored by women in Ideas y Valores.
The use of imagined speech with electroencephalographic (EEG) signals is a promising field of brain-computer interfaces (BCI) that seeks communication between areas of the cerebral cortex related to language and devices or machines. However, the complexity of this brain process makes the analysis and classification of this type of signals a relevant topic of research. The goals of this study were: to develop a new algorithm based on Deep Learning (DL), referred to as CNNeeg1-1, to recognize EEG signals in imagined vowel tasks; to create an imagined speech database with 50 subjects specialized in imagined vowels from the Spanish language (/a/,/e/,/i/,/o/,/u/); and to contrast the performance of the CNNeeg1-1 algorithm with the DL Shallow CNN and EEGNet benchmark algorithms using an open access database (BD1) and the newly developed database (BD2). In this study, a mixed variance analysis of variance was conducted to assess the intra-subject and inter-subject training of the proposed algorithms. The results show that for intra-subject training analysis, the best performance among the Shallow CNN, EEGNet, and CNNeeg1-1 methods in classifying imagined vowels (/a/,/e/,/i/,/o/,/u/) was exhibited by CNNeeg1-1, with an accuracy of 65.62% for BD1 database and 85.66% for BD2 database.
This paper aims to illustrate how a teacher instilled norms that regulate the theorem construction process in a three-dimensional geometry course. The course was part of a preservice mathematics teacher program, and it was characterized by promoting inquiry and argumentation. We analyze class excerpts in which students address tasks that require formulating conjectures, that emerge as a solution to a problem and proving such conjectures, and the teacher leads whole-class activities where students’ productions are exposed. For this, we used elements of the didactical analysis proposed by the onto-semiotic approach and Toulmin’s model for argumentation. The teacher’s professional actions that promoted reiterative actions in students’ mathematical practices were identified; we illustrate how these professional actions impelled students’ actions to become norms concerning issues about the legitimacy of different types of arguments (e.g., analogical and abductive) in the theorem construction process.
This chapter contemplates the concept of landscape and the way it is understood in school for Geography teaching, specifically in the context of the Colombian education system. Based on this analysis, the chapter argues that one of the principal attributes of the landscape is its assumption as a social construct. Given this, the chapter also aims to reinforce the thinking that the landscape needs to be understood from a social perspective in order to teach Geography adequately. The concept of landscape is first presented in a theoretical and conceptual context, and it is then considered in the context of the teaching of Geography at Colombian schools. These considerations are used to define possibilities for the recognition and study of landscape, and its role in Geography teaching through the perspective of the human presence and its interaction in the landscape.
This work shows how playing chess creates capacities in the student such as increasing visual memory. This helps to classify information in an orderly manner in the mind and contributes to a better understanding of geometric transformations such as displacements, turns and similarities. This was done with a mixed technique (Quantitative and Qualitative), starting with a structured questionnaire that was applied to 487 students. A case study was carried out with two students (one with and the other without notable chess skills) in two schools in Bogotá-Colombia, with the aim of understanding chess as a tool that can help the teacher to teach mathematics¡. In the quantitative part, data were collected by a structured questionnaire, and in the qualitative part, recordings and transcripts were made of what the two students reported in the case study. So, favorable results were achieved for students who usually play chess, because they show a great capacity for visual memory (in the long and short term) that contributes to a more optimal learning of displacements and similarities in the Cartesian plane. This research shows a powerful tool (chess) that can be used in the teaching of mathematics, thanks to the skills and concepts that are generated in the experience with the game.
Traducción de la conferencia L’attitude herméneutique, dictada por Christian Berner el 9 de octubre del año 2017 en la Universidad Nacional de Colombia, Bogotá, en el marco de un seminario organizado por el grupo de investigación La hermenéutica en la discusión filosófica contemporánea del Departamento de Filosofía y auspiciado por el acuerdo de intercambio académico internacional Ecosnord. Para una versión más completa de esta conferencia, publicada bajo el mismo título, cf. Stefano Bancalari(2016).
Presentamos el análisis de expresiones verbales de estudiantes de Educación Básica secundaria, en interacción comunicativa en una clase de geometría sobre semejanza de triángulos, usando rasgos propios del discurso matemático. Adoptamos una estrategia investigativa “basada en prácticas usuales”, con el objetivo de contrastar la hipótesis que teníamos, según la cual las verbalizaciones de los estudiantes en el aula de matemáticas suelen no ser útiles para el desarrollo del respectivo discurso, debido a rasgos intrínsecos de esas intervenciones. La hipótesis no se sostiene pues encontramos voces de estudiantes que tienen un potencial considerable para impulsar el discurso. Sin embargo, no siempre son aprovechadas por el profesor, quizá debido a una gestión que tiene como prioridad lograr la intervención de los estudiantes a costa de ejercer su papel de líder del discurso.
Parkinson’s disease (PD) is a neurodegenerative disorder that causes a progressive impairment in motor and cognitive functions. Although semantic fluency deficits have been described in PD, more specific semantic memory (SM) and lexical availability (LA) domains have not been previously addressed. Here, we aimed to characterize the cognitive performance of PD patients in a set of SM and LA measures and determine the smallest set of neuropsychological (lexical, semantic, or executive) variables that most accurately classify groups. Thirty early-stage non-demented PD patients (age 35–75, 10 females) and thirty healthy controls (age 36–76, 12 females) were assessed via general cognitive, SM [three subtests of the CaGi battery including living (i.e., elephant) and non-living things (i.e., fork)], and LA (eliciting words from 10 semantic categories related to everyday life) measures. Results showed that PD patients performed lower than controls in two SM global scores (picture naming and naming in response to an oral description). This impairment was particularly pronounced in the non-living things subscale. Also, the number of words in the LA measure was inferior in PD patients than controls, in both larger and smaller semantic fields, showing a more inadequate recall strategy. Notably, the classification algorithms indicated that the SM task had high classification accuracy. In particular, the denomination of non-living things had a classification accuracy of ∼80%. These results suggest that frontostriatal deterioration in PD leads to search strategy deficits in SF and the potential disruption in semantic categorization. These findings are consistent with the embodied view of cognition.
The present research shows the results obtained from the biosorption process of Pb, using coffee pulp as a biosorbent in synthetic waters. To do this, the lignin and cellulose content and the percentage of removal of Pb2+ ions was determined; additionally, the sorption’s optimal variables, such as the optimum pH, the point of zero charge (pHpzc), the kinetics and the adsorption isotherm, were determined. A comparison was made with other by-products derived from coffee crops. According to the results obtained in this research, the cellulose percentage was 29.12 ± 0.22% and the lignin percentage was 19.25 ± 0.16% in the coffee pulp, the optimum pH was 2.0 units and the kinetic model, which adjusted to the biosorption’s process, was the pseudo-second order of Ho and McKay, presenting an isotherm of Langmuir’s model and pHpzc of 3.95 units. Lastly, the removal of the pollutant was 86.45%, with a capacity of maximum adsorption of 24.10 mg·g−1 obtained with a particle size of 180 µm, time of contact of 105 min and at 100 RPM. Finally, we express that (a) the coffee pulp can be used as a sustainable alternative for the removal of the pollutant mentioned in synthetic and/or industrial wastewater matrices, to meet goals 3.9 and 6.9 of the Sustainable Development Goals of the 2030 agenda, and (b) the novelty of this research is the use of an agricultural waste of easy acquisition as a sorbent, without chemical modification, since it presented a high percentage of efficiency in the removal of Pb2+ ions. In turn, the challenge of this research is implementing this green technology on a pilot, semi-industrial and/or industrial scale in wastewater treatment systems.
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2,311 members
Gerardo Andrés Perafan
  • Doctorado Interinstitucional en Educación. DIE
Norma CONSTANZA Castaño Cuéllar
  • Departamento de Biología
Cecilia Agudelo-Valderrama
  • Departamento de Matemáticas
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http://www.pedagogica.edu.co/