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Using feed-forward perceptron Artificial Neural Network (ANN) model to determine the rolling force, power and slip of the tandem cold rolling
No full textIn this paper, an Artificial Neural Network (ANN) is used to investigate the influence of rolling parameters such as thickness reduction, inter-strand tension, rolling speed and friction on the rolling force, rolling power, and slip of tandem cold rolling. For this reason, the rolling power was derived for 195 various experiments through a series of observation tests. The network is trained and tested using real data collected from a practical tandem rolling line. The best topology of the ANN is determined by Broyden–Fletcher–Goldfarb–Shanno (BFGS) training algorithm and error, and nine neurons in the hidden layer had the best performance. The average of the training, testing, and validating correlation coefficients data sets are mentioned 0.947, 0.924, and 0.943, respectively. The obtained results show MSE value 4.2 × 10−4 for predicting slip. In addition, the effect of friction and angular velocity condition on the cold rolling critical slip phenomena are investigated. The results show that ANNs can accurately predict the cold rolling parameters considered in this study
Convergence of sequences in generalized topological spaces via filter
No full textIn this paper a generalization of convergent sequences in connection with generalized topologies and filters is given. Additionally, properties such as uniqueness, behavior related to continuous functions are established and notions relative to product spaces
Factorial analysis application to organizational public data for explaining the disclosure of environmental information
No full textThe articles objective is to analyze the dimensions of information disclosure related to corporate environmental sustainability. For this, public data from 100 Colombian companies were used, and an indicator was applied to assess environmental information disclosure. The study applied Principal Component Analysis (PCA), measures of central tendencies, and dispersion. It was designed as longitudinal research with a quantitative approach, explanatory scope, and non-experimental. The results prove the effectiveness of the PCA applied to public data, to address problems in the disclosure of environmental information at the organizational level. In parallel, it is evident that the dimension "Water" is the most relevant followed by the dimensions "Materials", "Emissions" and "Energy". These results allow us to conclude that the interested parties assign relevance in the same order they appear, which largely explains the disclosure of information related to organizational environmental sustainability
Adsorption of rare earth elements onto diatomite M45: experimental investigations and modeling with statistical physics theory
No full textThe separation of rare earth elements using diatomite M45 from aqueous solutions was studied. The experimental isotherms for the adsorption of trivalent lanthanum, cerium, and neodymium cations on this adsorbent were quantified under strongly acidic conditions (pH 2) at 298–328 K. The adsorption equilibria of these earth elements were analyzed using two statistical physics models (homogeneous and heterogeneous monolayer models). The results show that the adsorption of these ions implies a multi-ionic mechanism, which is exothermic. Si-containing functional groups are responsible for the adsorption of these rare-earth elements on the diatomite surface. A heterogeneous statistical physics model confirms that two Si-based functional groups participate in the separation of these cations. The calculated adsorption capacities at saturation follow the order: neodymium > cerium > lanthanum. Calculated interaction energies range from 28600 to 40100 J/mol, indicating physical adsorption on diatomite M45. This study demonstrates that diatomite M45 is a promising separation medium that can be used for the recovery of REEs dissolved in aqueous solutions via adsorption
Analysis of the geometry applied in the steering system of a formula-type single-seater vehicle
No full textThe ANGUILA F13 is a formula-type vehicle designed and built for the SENA ECO FORMULA competition. The objective of this research is to analyze the geometry applied to the steering system of vehicle ANGUILA F13 in order to know the characteristics and implementation of the system in the car. The method used for the design of the steering system had reference frame geometry, the rules of competition, the battle and track of the vehicle and the angle camber, caster and ackerman. In the results, the steering column to be fragmented into three parts provides greater security to the driver in case of frontal impact, the ackerman angle obtained allows the vehicle to have a smooth shift, total control of the vehicle when cornering and bonding gimbals makes it manageable direction. In conclusion, it was possible to obtain a good system performance and career management evidence taken in preventing the vehicle slipping when cornering
Energy conversion and beach protection: numerical assessment of a dual-purpose WEC farm
No full textThe installation of wave energy converter (WEC) arrays near the coast can have significant impacts on sediment dynamics and coastal morphodynamics. However, methodologies for quantifying these impacts and strategies to minimize them are still in need of development. In this study, we assessed the coastal response to a WEC array on the La Guajira coast in the Colombian Caribbean using a two-step numerical strategy. We used the Delft-3D model to estimate the wave field, which was then transferred to the XBeach model to compute morphological changes. This modelling strategy was applied to three WEC array layouts and compared the morphological responses in terms of the distance and relative orientation of the WEC array to the coast. The results showed that the impact of the simulated WEC array on the beach response varied significantly depending on its distance from the coast, the configuration of the array, and its orientation. These findings highlight the need for further research to develop effective strategies for minimizing coastal erosion impacts on coastal ecosystems through innovative alternatives. Developing such strategies will be crucial to ensure the sustainable implementation of WEC arrays and other renewable energy technologies near the coast
Educational Innovation and Current Challenges:
No full textEn un mundo que evoluciona constantemente, la innovación en los procesos formativos no solo es deseable sino esencial para mantenerse alineado con las necesidades y expectativas emergentes de nuestra sociedad. La capacidad de adaptar y transformar los sistemas educativos para enfrentar las demandas cambiantes de la sociedad no solo es crucial para el desarrollo sostenible, sino que también es fundamental para preparar a individuos competentes y comprometidos, capaces de liderar y contribuir efectivamente al bienestar colectivo en el futuro.In a world that is constantly evolving, innovation in training processes is not only desirable but essential to remain aligned with the emerging needs and expectations of our society. The ability to adapt and transform educational systems to meet the changing demands of society is not only crucial for sustainable development, but is also essential for preparing competent and committed individuals, capable of leading and effectively contributing to collective well-being in the future
Filosofía para niños y niñas con enfoque diferencial para fortalecer el clima escolar en estudiantes de básica primaria
No full textThe objective of the research is to propose a sequence of pedagogical strategies of Philosophy for boys and girls with a differential approach to strengthen the school climate in elementary school students of the District Educational Institution La Libertad and the Carlos Meisel Educational Institution. The critical rationalist paradigm, the deductive rationalist epistemological approach, the mixed research approach (quantitative-qualitative) and the descriptive propositional type of research are adopted. The population is considered to be 250 children enrolled in the elementary school cycle in the two (2) educational institutions investigated, and 60 4th grade students are selected as a sample. Surveys for students and interviews for teachers were used to collect information. The IBM® SPSS® Statistics software was used for the analysis of the surveys, and the AtlasTi software was used for the analysis of the interviews. The results show the presence of groups of different ethnicities, gender, sexual orientation, culture, beliefs, traditions, behaviors, religion and disabilities, which motivate aggressive behavior, attitudes of exclusion, isolation, mistreatment and rejection. In order to promote a harmonious, productive, supportive, democratic, inclusive and equitable school climate with equal opportunities and respect for the rights of others, a pedagogical proposal of philosophy for children with a differential approach is designed, so that the child learns to think, reflect, discover, investigate, and respond to their concerns in a critical manner, in search of rational and harmonious alternatives to solve conflicts.El objetivo de la investigación es proponer una secuencia de estrategias pedagógicas de Filosofía para niños y niñas con un enfoque diferencial para fortalecer el clima escolar en los estudiantes de Básica Primaria de la Institución Educativa Distrital La Libertad y la Institución Educativa Carlos Meisel. Se adopta el paradigma racionalista crítico, el enfoque epistemológico racionalista deductivo, el enfoque investigativo mixto (cuantitativo-cualitativo) y el tipo de investigación descriptivo propositivo. Se considera como población 250 niños matriculados en el ciclo de Básica Primaria en las dos (2) instituciones educativas investigadas, y se selecciona como muestra 60 estudiantes de 4º grado. Para recolectar información se aplican encuestas para estudiantes y entrevistas para docentes. Para el análisis de las encuestas se utiliza el software IBM® SPSS® Statistics, y para el análisis de la entrevista el software Atlas ti. Los resultados comprueban la presencia de grupos de diferentes etnias, género orientación sexual, cultura, creencias, tradiciones, comportamientos, religión y discapacidades, lo que motiva conductas agresivas, actitud de exclusión, aislamiento, maltrato, rechazo. Con el fin de promover un clima escolar armonioso, productivo, solidario, democrático, inclusivo, equitativo en oportunidades y de respeto a los derechos de los demás, se diseñó una propuesta pedagógica de filosofía para niños con enfoque diferencial, a fin de que el niño aprenda a pensar, reflexionar, descubrir, investigar, dar respuesta a sus inquietudes de manera crítica, en busca de alternativas racionales y armónicas para solucionar conflictos.Lista de Figuras 12 -- Lista de Tablas 13 -- Introducción 15 -- Capítulo 1. Planteamiento del Problema 17 -- Descripción del Problema 17 -- Formulación del problema 20 -- Interrogante principal 20 --Interrogantes secundarios 20 -- Objetivos 22 -- Objetivo General 22 -- Objetivos Específicos 22 -- Justificación 23 -- Delimitación del problema 25 -- Delimitación espacial y geográfica 25 -- Delimitación temporal 25 -- Delimitación temática 25 -- Mapa del problema 26 -- Capítulo II. Marco Referencial 27 -- Estado del Arte 27 -- Antecedentes Internacionales 27 -- Antecedentes Nacionales 31 --Antecedes Regionales y Locales 35 --Marco Teórico Conceptual 39 -- Filosofía para Niños 39 -- Educación diferencial. 41 --Clima escolar 42 -- Marco Legal 44 --
Operacionalización de las variables 46 --Capitulo III. Marco Metodológico 49 --Enfoque Epistemológico 49 --Paradigma Investigativo 50 -- Tipo de Investigación 51 --
Población y Muestra 51 -- Técnicas e Instrumentos de Recolección de Información 52 -- Encuesta 53 -- Entrevista 53 --Validación de Instrumentos 53 -- Técnicas de análisis de Información 54 --
Fases de la Investigación 56 --Capítulo IV. Análisis e interpretación de la información 58 --
Presentación de resultados de la encuesta aplicada a estudiantes 58 --Parte 1 de la Encuesta 58 --
Parte 2 de la Encuesta 64 --Transcripción de resultados de la entrevista aplicada a docentes 66 --
Análisis de resultados de la encuesta y entrevista 76 --Capítulo V. Propuesta Pedagógica 86 --Introducción 86 --Denominación de la propuesta 86 --Justificación 87 --Objetivo de la Propuesta 88 --Fundación metodológica 89 --Estrategias 90 --Validación de la propuesta 100 --
Conclusiones 102 --Recomendaciones 105 --Referencias 107 --Anexos 114--Magíster en EducaciónMaestrí
Memoria prospectiva en pacientes con deterioro cognitivo leve
No full textProspective memory is the ability to remember to carry out intended actions and to evoke delayed intentions. It constitutes a crucial skill for the daily functioning of the elderly. It might also be prematurely compromised in neurodegenerative diseases. In the Latin American region, objective measures are not available for its assessment. The aim of this study is to explore prospective memory in patients diagnosed with Mild Cognitive Impairment. As specific aims, we intend to discriminate the performance on prospective memory between patients and healthy subjects and to study the internal consistency and inter-examiner reliability of the Mini Cóndor Test (a simplified version of a prospective memory test developed in Argentina). We carried out a comparative study including a group of 20 patients with Mild Cognitive Impairment and a group of 20 healthy subjects as control group. Results indicated significant statistically differences between groups in prospective memory performance in favor of the control group. The Mini Cóndor Test met adequate scores for internal consistency and inter-rater reliability. These preliminary results suggest that the Mini Cóndor Test has the potential to early detect cognitive impairment associated to neurodegenerative pathology.La memoria prospectiva es la capacidad de recordar llevar a cabo acciones previstas o de evocar intenciones demoradas. La misma, constituye una habilidad crucial en el funcionamiento de la vida cotidiana de los adultos mayores. Además, puede verse comprometida de manera prematura en el proceso neurodegenerativo. En la región latinoamericana, no existen medidas objetivas para su correcta valoración. El objetivo general del presente trabajo es explorar la memoria prospectiva en pacientes diagnosticados con Deterioro Cognitivo Leve (DCL), mientras que los objetivos específicos son discriminar su rendimiento entre controles y pacientes con DCL y establecer la consistencia interna y la confiabilidad inter-examinador del test Mini Cóndor (versión simplificada de una prueba de memoria prospectiva desarrollada en Argentina). Se realizó un estudio comparativo de muestras independientes, con un grupo de 20 pacientes diagnosticados con DCL y un grupo control de 20 sujetos sanos. Los resultados indicaron que los grupos presentaban diferencias estadísticamente significativas en el desempeño de memoria prospectiva a favor del grupo control y que el test Mini Cóndor reunía adecuados índices de consistencia interna y de confiabilidad inter-evaluador. Estos resultados preliminares indican que el test Mini Cóndor tiene el potencial para detectar tempranamente el deterioro cognitivo asociado a patología neurodegenerativa
Organizational management in coordinating postgraduate university programs
No full textLa presente investigación caracteriza la gestión organizacional en las coordinaciones de postgrados de universidades del estado Zulia (Venezuela). Se utiliza una metodología cuantitativa, descriptiva, no experimental, diseño transeccional y de campo. Se emplean como unidades de observación 104 coordinadores, a los cuales se les aplica un cuestionario aprobado por diez expertos (confiabilidad de rtt = 0.857; método Alfa Cronbach). Los resultados revelan la concurrencia de los indicadores de la gestión organizacional estudiados, los cuales sugieren acciones de mejora, especialmente en contextos de crisis sociopolítica y de emergencia sanitaria. La variable de estudio, gestión organizacional, se describe cómo organizada y planificada, con debilidades en la dimensión “recursos”. Esto último afecta el alcance de las metas, aunque incide débilmente en la concreción de acciones para la optimización de una gestión administrativa. En conclusión, la gestión organizacional es afectada por factores sociales, ambientales y económicos, que inciden notoriamente en las decisiones y estilos de gerencia de los líderes.This research study characterizes organizational management when coordinating postgraduate university degrees in Zulia state (Venezuela). The applied methodology is quantitative, descriptive, non-experimental, transactional, and has a field design. The sample consists of 104 coordinators as observation units, surveyed with a questionnaire approved by 10 experts (reliability rtt =0.857; Alpha Cronbach method). The results show the concurrence of the organizational management indicators examined, revealing improvement actions that can be applied in the contexts of a sociopolitical crisis or a health emergency. The variable examined, organizational management, is described as organized and planned, with weaknesses in the "resources" dimension. This can affect the scope of goals, but it has a weak impact on conducting actions that aim to optimize administrative management. In conclusion, organizational management is affected by social, environmental, and economic factors, which notoriously influence the decisions and management styles of leaders