bluuebunny/crossref_metadata_2025 huggingface dataset:
Análisis del estado del arte del uso de tecnologías de transmisión de energía eléctrica
Authors: Ardila Romero Michael Alexander , Pazuña Naranjo. William Paúl
Published: January 2024

El artículo centra su atención en el examen de la literatura científico-técnica relacionada con las tecnologías que posibilitan el proceso de transición energética. Se resalta la inclinación hacia una generación más descentralizada, basada en el uso de tecnología de energía eléctrica con capacidad de almacenamiento y adaptabilidad en la demanda. Para este fin se utiliza métodos de inclusión y exclusión con el cual se logra obtener una base sólida de 21 artículos, conseguidas de varias revistas científicas.En cada una de ellas se identifica las tecnologías propuestas para la transmisión de energía eléctrica con lo que finalmente se enfatiza que la efectividad de la transición energética dependerá de la adopción de tecnologías útiles por parte de un sistema social, y se destaca la relevancia particular de la movilidad en este contexto. La importancia de las redes inteligentes se centra en optimizar las conexiones entre quienes producen y consumen energía, ofreciendo ventajas como una mayor confiabilidad, gestión activa de la demanda y sostenibilidad ambiental. Además, se resalta la necesidad de adaptar la infraestructura eléctrica existente para integrar cantidades significativas de energía renovable. Aunque la dependencia de combustibles fósiles está en declive, hay que tener en cuenta que la elección de la tecnología de transmisión dependerá de diversos factores, como la distancia de transmisión, la capacidad de carga, los costos asociados y las aplicaciones específicas. En la sección sobre HVDC, se destaca su eficiencia al transmitir electricidad a grandes distancias y su habilidad para conectar sistemas de corriente alterna con diferentes frecuencias.
Estudio de los efectos de la electropolución causada por las computadoras: Un enfoque desde el Instituto Tecnológico Tsa´chila
Authors: Zapata Villacis Nelson Rodrigo , Taco Rivera Jimena Carolina , Macas Blacio Lauro Lenin , Sandoval Sandoval; Edwin Marcelo , Obregón Gutiérrez. Ginna Aracely
Published: January 2024

El estudio evaluó los niveles de electropolución causados por el uso de computadoras en el Instituto Tecnológico Tsáchila, Ecuador. Los resultados mostraron que los niveles de electropolución se mantuvieron dentro de los límites de seguridad establecidos por organismos internacionales de salud, lo que sugiere que el uso habitual de computadoras en este entorno no representa un riesgo significativo para la salud en términos de electropolución. No se encontró una asociación significativa entre los niveles de electropolución y el tiempo de uso de la computadora ni la distancia a la misma. Aunque todos de los participantes utilizaba computadoras portátiles de diferentes marcas, y no se detectaron diferencias significativas en los niveles de electropolución asociadas al tipo de dispositivo.Este estudio sugiere que el uso regular de computadoras en el entorno del Instituto Tecnológico Tsáchila no representa un riesgo significativo para la salud en términos de electropolución. Los niveles medidos se mantuvieron dentro de los límites de seguridad establecidos, proporcionando tranquilidad a los usuarios de computadoras en este contexto. Se recomienda realizar estudios adicionales con muestras más amplias y en diferentes entornos para corroborar estos hallazgos y obtener una visión más generalizada sobre la exposición a la electropolución causada por las computadoras. Estos resultados contribuyen al conocimiento científico sobre los efectos de los campos electromagnéticos emitidos por las computadoras y podrían ser útiles para promover prácticas de uso saludables y la implementación de estrategias para proteger la salud en el contexto de la tecnología moderna.
Análisis de la Producción Energética con el Uso de Biodigestores Experimentales
Authors: Carrillo García Paul Iván , Hidalgo Osorio William Armando
Published: January 2024

El presente documento tiene como finalidad analizar la producción energética a través de la obtención de biogás, a partir de estiércol vacuno y porcino, en un biodigestor experimental en el cantón La Maná, en la provincia de Cotopaxi. La elección del emplazamiento es la primera etapa, seguido por la preparación del estiércol porcino y vacuno. El diseño del biodigestor se basó en la cantidad de biomasa disponible, contando con un espacio destinado a la producción de biogás, el volumen total es de 0.2197 m3, de este espacio disponible el 68% fue ocupado por la mezcla estiércol-agua que tuvo una relación de mezcla 1:1, en volumen. El tiempo de retención para cada tipo de estiércol fue de 50 días. Con un peso de 62 kg para el estiércol vacuno el biogás producido tiene un pH de 6, ligeramente ácido, una temperatura de 19.8 °C y un volumen de 0.04034 m3. Con un peso de 42 kg para el estiércol porcino el biogás producido tiene un pH de 5, ligeramente ácido, una temperatura de 20.2 °C con un volumen de 0.0508 m3, el biogás producido por cada residuo orgánico fue almacenado en tubos neumáticos de llanta.
Perspectivas y desafíos en la industria 4.0 para el sector agroindustrial de La Maná
Authors: Chasipanta Baraja Anderson Jason , Corrales Bonilla Johnatan Israel
Published: January 2024

La I4.0, también conocida como la cuarta revolución industrial, se caracteriza por la integración de tecnologías digitales en los procesos industriales. Estas tecnologías tienen el potencial de transformar el sector agroindustrial, mejorando la productividad, flexibilidad, eficiencia, fabricación y comercialización. Este trabajo aporta una visión general de la situación actual del sector agroindustrial de La Maná en relación con la adopción de tecnologías de la I4.0. Se analiza la transición de la industria tradicional a la I4.0, destacando la introducción de tecnologías como la inteligencia artificial, el Internet de las Cosas y la robótica. El trabajo se realizó mediante un análisis detallado de los cambios y aportes de la I4.0, con un enfoque específico en el sector agroindustrial de La Maná, Ecuador. El aporte e innovación del articulo radica en identificar los desafíos y beneficios de la adopción de la I4.0, así como en recomendar estrategias para superar los obstáculos, como la inversión en investigación y desarrollo y la capacitación del capital humano.
La Importancia del comportamiento estudiantil y el accionar de los docentes ante los cambios frecuentes de la Legislación educativa ecuatoriana
Authors: Maldonado Jaramillo Jimena del Rosario , Guerrero Castillo Ruth Albania , Núñez De Luca José Miguel , Ortega Soliz Joela Irene , Morales Manobanda Estalin Vinicio , Valencia Ávila Angela Janeth
Published: January 2024

La educación en Ecuador ha experimentado en los últimos años constantes reformas legales que generan incertidumbre en estudiantes y docentes. Ante este panorama, la presente investigación analizó mediante encuestas a 90 docentes el impacto de estos cambios en el comportamiento estudiantil y la labor docente. Así, mediante una metodología de diseño descriptivo no experimental de enfoque cuantitativo, se aplicó un cuestionario anónimo a docentes de educación básica y bachillerato de instituciones públicas de la provincia de Santo Domingo de los Tsáchilas, Ecuador. La hipótesis de esta investigación fue ¿hay una relación entre el comportamiento estudiantil y el accionar docente por los constantes cambios en la legislación educativa del Ecuador? Los resultados confirman la hipótesis sobre la relación entre inestabilidad legal, la actitud de “quemeimportismo" en alumnos y el exceso de protección que fomenta irresponsabilidad. Un 75% de docentes afirma que los cambios normativos afectan a los estudiantes y un 70% reporta reacciones de apatía e indiferencia ante las reformas. Un 60% confirma el incremento del "quemeimportismo" entre los jóvenes. Un 80% señala dificultades en su práctica pedagógica por las exigencias de adaptarse constantemente. Ante esto, se concluye que los estudiantes deben comprometerse con su aprendizaje, superando actitudes como el "quemeimportismo". Y que, con reformas más adecuadas y coherentes que proporciona el Ministerio de Educación, los docentes necesitan capacitarse e involucrarse activamente para mejorar la calidad del proceso formativo. En conclusión, el comportamiento proactivo de estudiantes y docentes es clave ante reformas legales frecuentes, para garantizar una mejor educación en el país.
¿Cómo Influye La Acción Pedagógica En El Proceso De Enseñanza – Aprendizaje?
Authors: Guerrero Castillo Ruth Albania , Montesdeoca Salazar Yadira Alexandra , Arias Reyes Ana Gabriela , Quiroz Alcivar Carmen Marilin , Nuñez Garcia Lady Dayana , Suárez Mendoza Jenny Mercedes
Published: January 2024

Los profesionales de la educación, en el ejercicio de sus responsabilidades, deben estar preparados para enfrentar desafíos, buscando un desarrollo tanto profesional como personal que cumpla con las expectativas y necesidades tanto de los estudiantes como del ámbito educativo. Este estudio analizó la influencia de la acción pedagógica de los docentes en el proceso de enseñanza-aprendizaje. Partiendo de un enfoque cuantitativo, se aplicó una encuesta a 100 profesores anónimos de escuelas públicas de la provincia de Santo Domingo de los Tsáchilas, Ecuador, para determinar cómo sus estrategias metodológicas impactan resultados de aprendizaje. La hipótesis de esta investigación fue ¿influye la acción pedagógica en el proceso de enseñanza - aprendizaje? Los hallazgos revelan que las prácticas pedagógicas activas como aprendizaje basado en proyectos tienen buena adopción, promoviendo una participación más profunda de los estudiantes. Sin embargo, la evaluación formativa y retroalimentación continua son aún parciales, dificultando el monitoreo del progreso. Se evidencian también brechas en generar un clima socioemocional positivo. La tecnología está subutilizada como recurso didáctico. En conclusión, la acción pedagógica impacta significativamente el aprendizaje integral de los estudiantes. Pero se necesita fortalecer aquellas prácticas que propician la motivación, evaluación formativa, habilidades blandas y aprendizaje activo situado. Capacitar a los docentes en nuevas metodologías y aprovechar mejor la tecnología son claves para una educación efectiva. Los aportes de este estudio buscan guiar la formación docente, las políticas educativas y estrategias de gestión escolar para mejorar las prácticas de enseñanza, llegando a un aprendizaje profundo y multidimensional en los estudiantes.
Desarrollo de Aplicación Móvil con la Identificación Morfológica de Especies Vegetales.
Authors: Castro Tigua Marcelo Fabian , Sócola Riofrio Jenniffer Anahi , González Sanango Holger
Published: January 2024

La implementación de tecnologías innovadoras en la agricultura es esencial para abordar los desafíos actuales en la identificación de especies vegetales. Este proyecto presenta Botanix, una aplicación móvil que busca simplificar la identificación morfológica de plantas a través de dispositivos móviles. La metodología de desarrollo se basa en el modelo en cascada, proporcionando una estructura secuencial para el proceso, desde la recopilación de datos hasta el mantenimiento. La elección de Ionic 6 y Angular facilitó la integración entre el front-end y el back-end, respaldada por tecnologías como JavaScript, CSS y HTML, y la eficiente base de datos SQLite. La aplicación recopila información detallada sobre las características morfológicas de diversas especies, presentándola de manera clara y accesible, enriquecida con imágenes de alta resolución. Se realizaron pruebas de ejecución en diferentes dispositivos y versiones de Android para garantizar la adaptabilidad. La evaluación a 10 usuarios destaca el éxito en el nivel de interés y la interactividad, señalando estrategias efectivas para mantener a los usuarios comprometidos. Botanix demuestra una adecuación exitosa del contenido para su público objetivo, con el 60% de los usuarios considerando que está perfectamente orientado. Además, la aplicación se percibe como intuitiva y fácil de aprender, es decir emerge como una herramienta valiosa en la identificación de especies vegetales, fusionando eficazmente la tecnología, la usabilidad y la adecuación al usuario.
Análisis comparativo de controles Neumáticos y Electroneumáticos en diferentes tipos de Secuencias
Authors: Reyes Macías Carlos Bryan , Corrales Bonilla Johnatan Israel
Published: January 2024

El presente trabajo aborda una comparación exhaustiva entre sistemas de control neumático y electroneumático, centrándose en tres métodos de secuencia: intuitivo, paso a paso y en cascada. Utilizando el módulo didáctico de control de la Universidad Técnica de Cotopaxi, se realizaron ensayos bajo las secuencias A+B+C+A-B-C- y A+B+A-C+B-C-. Se llevaron a cabo tres ensayos para validar los datos, utilizando instrumentos como cronómetros y pinzas amperimétricas para medir tiempo y consumo eléctrico, respectivamente. El análisis estadístico se realizó mediante ANOVA y pruebas de Tukey. Los resultados destacan diferencias significativas en costo, eficiencia energética y velocidad de respuesta entre los sistemas. Este estudio proporciona una visión integral y detallada de las prestaciones de ambos sistemas, contribuyendo a la comprensión y toma de decisiones en entornos industriales.
Realidad aumentada como estrategia didáctica innovadora en la enseñanza de Tecnologías de la Información y Comunicación
Authors: Rodríguez Vizuete Jaime Darío , Cuenca Mera Christopher Alexis , Barcia Cedeño Erika Iveth , Saavedra Mera Karina Auxiliadora
Published: January 2024

Esta investigación cualitativa introdujo la realidad aumentada como una estrategia didáctica innovadora en la enseñanza de la asignatura de Tecnologías de la Información y Comunicación (TIC), con el propósito de mejorar la motivación de los estudiantes. En este estudio descriptivo con diseño cuasiexperimental, se implementó la metodología de realidad aumentada utilizando dos herramientas específicas: Vuforia y HP Reveal, tanto de manera individual como grupal. La evaluación de la aplicación de la metodología se llevó a cabo mediante el uso del instrumento CMEA (Cuestionario de Motivación y Estrategias de Aprendizaje) mediante pretest y postest (Ramírez et al., 2013). Como resultado, se confirmó una mejora significativa en los seis factores de la escala de motivación. Los estudiantes mostraron un mayor nivel de motivación en clases, evidenciando una participación más activa en el proceso de aprendizaje.
La enseñanza-aprendizaje de programación en computadora con PSeint: Una revisión sistemática.
Authors: Navarrete Mora Luesner Hernán , Freire Jaramillo Giovanni Antonio , Fernández Unuzungo Giovanni David , Gilces Loor Edder Joffre , Mego Cubas Carlos
Published: January 2024

El presente artículo aborda la revisión sistemática de literatura sobre la enseñanza aprendizaje de la programación en Pseint, Concretamente con este trabajo se da respuesta a interrogantes como: ¿Cuáles es el programa, para la enseñanza aprendizaje de la programación, de código abierto diseñado para ayudar a los estudiantes a aprender los fundamentos de la programación? ¿Cuáles son los tipos de estrategias para el análisis y la solución de un problema de programación por medio de un programa computacional? Se analizaron producciones científicas en el período de 2014 a 2022. El estudio se apoya en la metodología propuesta Moher, Liberati, Tetzlaff & Alman (2014). Las producciones revisadas aportan datos teóricos en el ámbito de la enseñanza de la programación, Los resultados muestran que la enseñanza y el aprendizaje a la programación han sido de gran interés que, por medio del desarrollo del pensamiento, en seudocódigo y diagrama de flujo, ayudan para llegar a la solución de un problema.
PROXIMAL MEDIAN NERVE COMPRESSION DUE TO GIANT LIPOMA. SURGICAL TREATMENT UNDER WALANT.
Authors: Coelho Nunes Cátia , Alves Marcelo , Rocha Maria Inês , Madeira Sofia , Rodrigues Susana , Lino Rui
Published: January 2024

Lipomas are benign mesenchymal tumors, which can be found anywhere in the body. In less than 1% of cases, they can be observed in distal extremities. The authors describe a rare case of a giant lipoma in the proximal third of the forearm associated with median nerve compression. WALANT surgical resection allows for a safe and complete excision of the tumor. The authors present a short review of the pertinent literature.
"In My Experience…Implant Arthroplasty for the Base of the Thumb is Underutilized
Authors: Badia, MD Alejandro
Published: January 2024

I would argue that we try to preserve the hapless trapezium.
DEFYING SURVIVORSHIP: MARÍA HERNÁNDEZ MARTÍ AND JAVI DE CASTRO’S QUE NO, QUE NO ME MUERO: Y SI ME MUERO NO ES EL FIN DEL MUNDO
Authors: Aramburu Diana
Published: January 2024

Together with illustrator Javi de Castro, María Hernández Martí published Que no, que no me muero in 2016, giving a fictional rendition of her breast cancer experience through the character of Lupe in this breast cancer graphic narrative. Hernández Martí and de Castro employ Lupe to break with certain myths and stereotypes surrounding mainstream breast cancer culture, specifically targeting what Barbara Ehrenreich’s terms its “relentless brightsiding”. Que no, que no me muero with its somber tone and colors proposes an alternate story of survivorship that rebels against the pathologizing gaze. Hernández Martí y de Castro’s text is not an uplifting or cheerful breast cancer graphic narrative, but one that is defiant and disobedient of mainstream breast cancer culture.

RESUMEN

Junto con el ilustrador Javi de Castro, María Hernández Martí publicó Que no, que no me muero en 2016, brindando una interpretación ficticia de su experiencia con el cáncer de mama a través del personaje de Lupe en esta narrativa gráfica sobre el cáncer de mama. Hernández Martí y de Castro emplean a Lupe para romper con ciertos mitos y estereotipos que rodean la cultura dominante sobre el cáncer de mama, y ​​se enfocan específicamente en lo que Barbara Ehrenreich llama su "relentless brightsiding". Que no, que no me muero con su tono y colores sombríos propone un relato alternativo de supervivencia que se rebela contra la mirada patologizante. La obra de Hernández Martí y de Castro no es una narrativa gráfica edificante o alegre sobre el cáncer de mama, sino una que es desafiante y desobediente a la cultura dominante del cáncer de mama.
ANIMACIÓN, MEMORIA Y ACTIVISMO EN 30 AÑOS DE OSCURIDAD (2011)
Authors: Costa Knufinke Joana
Published: January 2024

30 Years of Darkness (2011) is a documentary about the “moles” of the Spanish dictatorship. It is centered on Manuel Cortés, mayor of Mijas at the time of the military uprising in Morocco, who spent 30 years hiding inside his home. This article explains the multiple functions that animation plays in the film. Through this analysis, it is shown that one of the most important functions of the animation is the vindication of the role of testimonies in the construction of “history.” The article also analyzes how the documentary, thanks to the use of animation, is part of the dialogue between memory and post-memory of the Spanish Civil War and the dictatorship. This analysis is also connected with the activist nature of the documentary in its production, distribution, and exhibition stages.

RESUMEN

30 años de oscuridad (2011) es un documental sobre los “topos” de la dictadura española centrado en la figura de Manuel Cortés, alcalde de Mijas en el momento del alzamiento militar en Marruecos, que estuvo 30 años escondido en su casa. El presente artículo explica las múltiples funciones que la animación tiene en el largometraje. Mediante este análisis se demuestra que una de las funciones más importantes de la parte animada es la reivindicación del testimonio como parte esencial de la construcción de la “historia”. El artículo analiza también cómo el documental, gracias al uso de la ilustración animada, se inscribe en el diálogo de la memoria y de la post-memoria de la guerra civil española y de la dictadura. Asimismo, el análisis se conecta con la naturaleza activista del documental tanto en la fase de producción, como en las fases de distribución y exhibición.
UNA ALFOMBRA ROJA PARA ÁFRICA. ETNICIDAD Y ESPECTÁCULO EN UN FESTIVAL DE CINE DE EVA DE ANDRÉS CASTRO.
Authors: Ballesteros Isolina
Published: January 2024

Book Review
Discurso matemático, semiose e produção de significado em sala de aula
Authors: Romão da Silva Daniel
Published: January 2024

O presente artigo parte do pressuposto de que a ação das pessoas sobre o mundo se baseia na mobilização de diversos recursos semióticos. A partir desse pressuposto, são considerados o discurso matemático e o discurso da sala de aula segundo um ponto de vista semiótico, bem como suas interpelações e diálogos de modo a construir significado para a Matemática na sala de aula.
Mapeamento de ferramentas educacionais sobre Propriedade Intelectual para o Ensino Médio Profissionalizante
Authors: Oliveira Edinara Mayra de Morais , Barros Aldre Jorge Morais
Published: January 2024

No contexto global, promover a compreensão da Propriedade Intelectual (PI) no ensino médio profissionalizante é amplamente reconhecido como uma estratégia crucial para o progresso. Com esse propósito em mente, este artigo se dedicou a rastrear as ferramentas educacionais existentes no Brasil relacionadas à PI e voltadas para esse público-alvo. Esta pesquisa foi realizada com levantamento de materiais didáticos de PI orientados para o ensino médio técnico em duas bases de dados: o repositório de trabalhos acadêmicos do Programa de Pós-Graduação em Propriedade Intelectual e Transferência de Tecnologia para a Inovação (PROFNIT) e o Instituto Nacional de Propriedade Industrial (INPI). Como resultado da investigação, foram encontrados sete recursos pedagógicos voltados a este público-alvo. Esse mapeamento reforçou a constatação de que os recursos educacionais sobre esse tema ainda são escassos e carecem de desenvolvimento mais amplo.
Social Exclusion of Minorities: An Investigation of Multi-dimensional Social Disadvantage faced by Pakistani Minorities
Authors: Lak Tauqeer Ahmed , Ahmad Nasim , Asad Imrana
Published: January 2024

Minorities, as numerically inferior and culturally distinct groups, are often marginalized and isolated throughout the world. The aim of this research is to understand the nature and extent of social exclusion faced by religious minorities in Pakistan. The objectives of the study are to assess the level of social exclusion among non-Muslim minorities and examine the various factors contributing to social exclusion. Additionally, it investigates the associations between these attributes of social exclusion. The questionnaire includes a series of statements and questions that cover all dimensions of the variable being measured. 220 heads of minority families were selected by employing multistage sampling. Participants were interviewed by experienced interviewers using an interview schedule. The results indicate that the majority of participants (59.1%) perceive that they experience a high level of exclusion, while 26.8% face moderate exclusion, and 14.1% are at a low level of social exclusion. Hypothesis testing examines the level of exclusion faced by different minority groups. The study reveals that the Christian minority experiences a higher level of exclusion compared to other minority groups, such as Hindus and Sikhs, probably because they are more materially deprived. This study demonstrates the positive association between various factors contributing to social exclusion, such as material deprivation, limited access to civil rights, low social participation, and political disengagement.
Mathematical Models for Adsorption Capacity and Percent Removal of Heavy Metals from Water Using Stat-Ease 360
Authors: Musa Abubakar Abdulhalim , Schieferstein Eva , Azura Zakarya Irnis , Coto Baudilio , Noisri Chantawan , Taiwo Mobolaji Adegoke , Ahmad Hijaz
Published: January 2024

Heavy metal removal using adsorbent materials like watermelon rind, as investigated herein, will ensure a safe drinking water for consumption. For the first time, mathematical models taking A = adsorbent dosage, B = contact time and C = initial concentration as input variables were developed using Stat-Ease 360 design of experiment (DOE) tool for adsorption capacity (R1) and percent removal of heavy metals including, arsenic, cadmium, chromium, copper and lead (R2) in water, as two sole output variables. The models generated based on existing experimental observations (A, B, C) can be used to predict the responses or outputs of the adsorption process, especially looking at their respective satisfactory statistical performance parameters obtained. Several 3D surface and contour plots reveal the optimal factor combination for peak response performance for a particular metallic contaminant in the water. Optimal values for arsenic removal are 0.1g A, 120 min B, 3.12 mg/g R1 and 100% R2. Those of other metals present are as follows: 0.1g A, 60 min B, 0.17 mg/L C, 144.75 mg/g R1 and 85.78% R2 for cadmium; 0.1-1.2g A, 0<B≤120 min, 0.028 mg/L C, 215 mg/g R1 and 85.53% R2 for chromium; 0.1-1.2g A, 0<B≤120 min, 0.041 mg/L C, 275 mg/g R1 and 80% R2 for copper and; 0.1-1.2g A, 0<B≤120 min, 0.029 mg/L C, 205 mg/g R1 and 83.42% R2 for lead. This study falls short of many heavy metals such as zinc, nickel, cobalt, antimony, iron and mercury removal used to test the effect of other factors like pH, presence of co-existing ions, temperature and sorbent particle size for their adsorption performance.
Investigating the Production of Ultrafine Engineering Material from Low-Grade Gariti Barite Ore Using Gravity Concentration Methods
Authors: O. Alabi Oladunni , E. Gbadamosi Yemisi
Published: January 2024

The objective of this research is to upgrade the low-grade Gariti barite ore to produce an ultrafine engineering material that can be used for industrial application by the assessing gravity concentration method. The research focuses on chemical characterization, fractional sieve size analysis, scrubbing technique, wilfley shaking table technique, and air float technique. The sample was subjected to an energy-dispersive X-ray fluorescence spectrometer and fractional sieve analysis of the crude sample was carried out at a sieve range of 1400-63 µm towards the production of ultrafine mineral-based material for liberation size determination. Ten (10) kg, each of the actual liberation size were used for the scrubbing technique, wilfley shaking table technique, and air float technique respectively. The chemical analysis indicates the presence of major elements 79.20 % BaSO4, 14.4% SO3, 64.80% BaO, 3.80% Fe2O3, 5.15% SiO2, 1.40% TiO2, and other minor elements that confirms that the soured mineral is barite while the particle size analysis showed that -250+ 180 µm sieve size fraction assaying 89.11% BaSO4 is the ore’s actual liberation size. The chemical analysis of the low-grade Gariti Barite ore after undergoing a concentration test at the economic liberation size revealed the values of concentrates from the scrubbing technique to be 86.60% BaSO4, Wilfley shaking table technique to be 86.10% BaSO4, and air float technique to be 88.30% BaSO4 and from this results, it shows that air float technique had the highest assaying value. Finally, the low-grade Gariti barite ore has been upgraded from 79.20% BaSO4 to ultrafine mineral-based engineering material of 86.60%, 48.6% 86.10%, and 88.30% BaSO4 via gravity concentration method.
Static Structural Analysis of Suspension System
Authors: Ranjan Pradhan Tarini , Aniket Sunil Dani , Shrivastava Aman
Published: January 2024

Coil spring suspension systems are widely used in various applications, including automotive, industrial, and aerospace engineering. The spring, bearing, piston rod, seal block, rebound adjuster, and hydraulic oil make up the suspension system. The suspension system's main purposes include increasing the amount of contact time between the tyres and the road. It supports the vehicle's weight evenly and offers stable steering and good handling. The principle of force dissipation, which involves converting force into heat and thereby eliminating the impact that force would have made, underlies how a suspension operates. The energy will be stored by a spring and transformed into heat by a damper. By applying a theoretical method to determine the deflection of coil spring suspension system in this paper. Here mainly focus on the basic coil spring model which is the main part of suspension system. It also aids in the bike and rider's ability to absorb significant shocks when executing jumps. For designing of coil spring suspension system 3D software Solid works is used. For analysis of the model ANSYS workbench is implemented. Using standard theoretical data, analytical & simulation results are compared & mesh convergence graph study is also done in this paper.
Study of Extrude Aluminum Alloy LED Bulb in a Passive Mode of Cooling System with a Different Array of Fin Structure
Authors: Namdeo Pawar Nitin , Nanwala Hameshbabu
Published: January 2024

Nowadays, the world is running behind power generation as well as power saving. In the lighting industry, the L.E.D. bulb is used for lighting purposes. The main problem faced by the world is heat dissipation from a heat sink by active or passive cooling. The system accessories enhance the overall cost by using active cooling. This paper studied that it has been used to reduce the overall cost of L.E.D. bulbs by increasing the heat transfer rate concerning increasing heat transfer coefficient. It needs to understand the various parameters such as porosity, heat transfer rate, laminar flow, density, and heat transfer modes to achieve the above-desired result. Their application is for street lights, gardens, mall parking, and bulging decorative lights. The cross-shape fin array is a suitable replacement with porosity of more than 0.85 for a proper swirl during the cooling time for an active cooling system for an existing bulb.
Methodology Experimental Tests on Modified Pin-on-Disc Testing Machine
Authors: Shodmanov Jasur , Makhkamov Anvar
Published: January 2024

The most significant variable in all metal forming processes is the formability of the material. The degree of difficulty determined by this variable is essential for lubricant selection. It is expected that a lubricant will facilitate the sliding of the workpiece in the tool by reducing friction and, at the same time will provide an effective separation layer between the workpiece and the tool.Therefore, in this article, the results of scientific research on preventing damage to the metal sheet surface by lubrication are described in detail.
Inhibition of Corrosion in Acidic Solutions: A Mini-Review on the Role of Heterocyclic Compounds
Authors: A. Alamiery Ahmed
Published: January 2024

Corrosion poses a persistent challenge in acidic environments, necessitating the exploration of effective corrosion inhibitors. This mini-review focuses on the utilization of heterocyclic compounds as corrosion inhibitors in acidic solutions. Beginning with an overview of corrosion mechanisms in acidic environments, we delve into the diverse array of heterocyclic compounds investigated for their corrosion inhibition properties. Emphasis is placed on elucidating the mechanisms through which these compounds mitigate corrosion, ranging from surface adsorption to film formation. Recent advancements in the field are highlighted, showcasing novel compounds and formulations exhibiting promising results. A comparative analysis evaluates the effectiveness of various heterocyclic compounds, considering factors such as inhibition efficiency, cost, and environmental considerations. Despite notable successes, challenges and limitations are discussed, paving the way for future research directions. In conclusion, this mini-review underscores the significant strides made in harnessing heterocyclic compounds as corrosion inhibitors, offering a glimpse into their potential impact on addressing corrosion challenges in acidic environments.
TUMEURS BENIGNES DES MAXILLAIRES : ASPECTS EPIDEMIOLOGIQUES, DIAGNOSTIQUES ET THERAPEUTIQUES
Authors: EM Djemi , PIJ Bérété , NEK Zegbeh , ABMD Amenou , NEH Mafata , OADM Ory
Published: January 2024

The aim of this study was to describe the epidemiological, diagnostic and therapeutic aspects of benign maxillary tumours. Material and methods: This was a retrospective study carried out from January 2017 to December 2020 in the odontostomatology and maxillofacial surgery department of the Bouaké Hospital. It included all patients presenting with a benign tumour or pseudotumour of the maxillae and whose diagnosis had been made clinically, radiologically and histologically. Results: During the study period, 30 cases of benign maxillary tumours were recorded. The mean age was 27.6 years (8-53 years). The sex ratio was 2.33. Facial swelling was the most common reason for consultation (100%). The average time to consultation was 5.8 years (3-14 years). Maxillofacial CT scans were performed in all patients. The site was mandibular in 23 patients (76.6%) and ameloblastoma was the most common benign tumour (33.3%). All patients received surgical treatment. It was conservative in 13.3% of cases (n=04) and surgical interruption in 86.7% of cases (n=96). The outcome was favourable in 28 patients (93%). Two patients (7%) developed a postoperative infection of the mandibular stent. Conclusion: Benign maxillary tumours represent an important entity in maxillofacial pathology. Ameloblastoma is the most common benign tumour. It is treated surgically with good results. To improve the management of these tumours, patients should be made aware of the need for early consultation and treatment.
PRONOSTIC DES PATIENTS HOSPITALISéS POUR COVID-19 AU CENTRE DE TRAITEMENT DES é PIDé-MIES (CTE) DE L’HôPITAL RéGIONAL DE T HI èS DU 1ER MAI 2020 AU 15 SEPTEMBRE 2020
Authors: Faye Fulgence Abdou , Dieng MA , Gueye AD , Ngom NF , Ba A , Marone Z , Ndiaye Y , Sow K , Diallo B , Berthé A , Touré PS , Ka O , Diop MM , Diop BM , Ka MM ,   Université Iba Der Thiam de Thiès - UFR des Sciences de la Santé/Sénégal,   Service de Médecine interne Centre Hospitalier Régional Heinrich Lucké de Diourbel/Sénégal,   Service de Médecine interne de l’Hôpital Abdou Aziz Sy Dabakh de Tivaouane/Sénégal,   Service de Médecine Interne Centre Hospitalier Régional de Thiès/Sénégal
Published: January 2024

Since the beginning of March 2020, Senegal has been confronted with the COVID-19 pandemic, and its first case was recorded on 2 March of the same year. In the Thiès region, studies have focused mainly on the management of confirmed cases of COVID-19, but few have addressed the evolutionary aspect. We therefore took upon us to assess the prognosis of patients after hospitalisation in order to evaluate possible somatic or psychological effects linked to COVID-19.
éVALUATION DE LA CONfORMITé AUX RECOMMANDATIONS INTERNATIONALES DU SUIVIMéDICAL DES PATIENTS HéMODIALYSéS CHRONIQUES à DAKAR
Authors: Faye M , Ba B , Bellahcen M , Seck SM , Faye M , Keita N , Lemrabott AT , Niang A , Ka EF ,   Hôpital Aristide Le Dantec, Dakar, Sénégal,   Université Gaston Berger de Saint Louis, Sénégal,   Hôpital militaire de Ouakam, Sénégal,   Hôpital Dalal Jamm de Guédiawaye
Published: January 2024

Objectives: The aim was to assess the quality of medical follow-up of chronic hemodialysis patients in Dakar using quality indicators defined according to international guidelines.Patients and methods: This was a 6-week cross-sectional study. Patients with chronic hemodialysis for at least 9 months in the same hemodialysis center, consenting and after authorization by the nephrologist in charge of the center were included. Based on international guidelines, quality indicators were defined and contextualized.
HYPOTHYROIDIES AU SERVICE DE MEDECINE INTERNE/ENDOCRINOLOGIE-DIABETOLOGIE NUTRITION DU CENTRE HOSPITALIER NATIONAL DE PIKINE-SENEGAL : ETUDE RETROS-PECTIVE DU 01 JANVIER 2011 AU 30 JUIN 2019
Authors:   Service de Médecine Interne/ Endocrinologie Diabétologie Nutrition du centre hospitalier national de Pikine /UCAD Sénégal, Ndiaye N , Leye YM , Diack ND , Ba M , Samb K , Sougou B , Gueye M , Leye A
Published: January 2024

Introduction: Hypothyroidism is the most common thyroid dysfunction. It is important to determine the cause because some forms are reversible. The objective of our study was to establish the profile of hypothyroidism in our practice. Methods: this was a retrospective study during the period from January 1, 2011 to June 30, 2019 including all patients with hypothyroidism confirmed by hormonal assays and followed at the Internal Medicine, Endocrinology, Diabetology and Nutrition department of the National Hospital Center of Pikine. Results: we retained 292 files of patients monitored for hypothyroidism. The average age of the patients was 49.7 years. There were 276 women and 16 men. Hypothyroidism was peripheral in 289patients (98.97%) and central in 3 patients (1.03%). Concerning the aetiologies of peripheral hypothyroidism, it was a thyroidectomy in 70 patients (23.97%), radio-iodine therapy in 7 patients (2.39%), Hashimoto’s disease in 58 patients (19.86%), atrophic thyroiditis in 10 patients (3.42%) and a thyroid hormone synthesis disorder in 2 patients (0.68%). In 140 patients suffering from peripheral hypothyroidism (47.94%), no aetiology could be retained. Hashimoto’s disease was associated with other autoimmune diseases in 3 patients including myasthenia gravis, Addison’s disease and Goujerot syndrome. For the three patients presenting thyrotropic insufficiency, Sheehan syndrome was suggested in the face of a notion of haemorrhagic delivery, followed by an absence of milk flow. Pituitary magnetic resonance imaging showed an empty Sella turcica appearance. Conclusion: we can conclude that the aetiologies of hypothyroidism in our practice are dominated by thyroidectomy and Hashimoto’s disease. The aetiology was undetermined in 48% of patients due to insufficient exploration.
ACCèS à LA DIALYSE ET LéTALITé DES PATIENTS INSCRITS SUR LA LISTE D’ATTENTED’HéMODIALYSE DU CENTRE HOSPITALIER UNIVERSITAIRE ARISTIDE LE DANTEC
Authors: Faye M , Keita N , Ba B , Zentari M , Faye M , Mbengue M , Lemrabott AT , Niang A , Ka EF
Published: January 2024

Introduction: The aims of this study were to evaluate the lethality and access to dialysis of patients registered on the hemodialysis waiting list of the Aristide Le Dantec University Hospital Center and to identify their associated factors at the time of registration.Patients and methods: A retrospective, descriptive and analytical study used the register on the hemodialysis waiting list over a period from January 2014 to December 2018. Lethality and access to dialysis were calculated and socio-demographic and economic factors were considered as potential associated factors.Results: Seven hundred and fifty-one (751) files were included. Dakar was the region of origin in 67.93%. The average age was 48.15±15.21 years with a sex ratio of 1.02. The socio-economic level was low in 85.41%. Ten patients had joined a social protection system (1.64%). Patients were reachable in 83.36%, case fatality was 49.66% and access to dialysis was 16.24%. Registration before January 2016 was associated with access to dialysis (OR=10.8 [5.03-23.18]). Registration before January 2016 (OR=1.90[1.29-2.80]), age over 65 (OR=2.35[1.31-4.21]) and low level socio-economic (OR=1.81[1.10-3.19]) were associated with lethality.Conclusion: Access to dialysis in a public structure in Senegal remains low and lethality before access to dialysis is associated with low socio-economic level and advanced age. The decentralization of dialysis centers has made it possible to improve these proportions.
LES RéACTIONS TRANSfUSIONNELLES : fRéQUENCE ET CONDUITE THéRAPEUTIQUE à L’HôPITAL RéGIONAL DE LABé EN GUINéE
Authors: Diakité M , Diallo I , Diallo AG , Diallo TAB , Kanté AS , Condé A , Traoré M , Doukouré AS , Haba NY , Kourouma K
Published: January 2024

Introduction: The Labé regional hospital is the second largest hospital in Guinea. Our aim was to determine the incidence of transfusion reactions, describe their management and identify the factors associated with their occurrence.Material and methods: This was a cross-sectional descriptive and analytical study conducted over 6 months from 1 November 2019 to 30 April 2020 at Labé regional hospital. We divided transfusion reactions according to WHO grades. We performed a statistical analysis to identify the factors associated with the reactions recorded.Results: Of the 246 patients transfused with whole blood, 14 developed a transfusion reaction, a frequency of 5.7%. For 55.1% of patients, the initial haemoglobin level varied between 5.1 and 8g/dl, and severe malaria was the most frequent indication for transfusion (28.0%). Of the 14 patients who developed a transfusion reaction, 8 (57.1%) were women. Shivering-hyperthermia syndrome was the most common transfusion reaction with 57.1% (n=8). All transfusion reactions were grade 1 and occurred during transfusion (50% within the first 30 minutes). The mean duration was 52.28 minutes. The management measures were based on stopping the transfusion (85.7%), maintaining the venous line (85.7%), administering an anti-inflammatory drug (85.7%) and stopping the transfusion (85.7%), maintenance of the venous line (85.7%), administration of medication and monitoring of vital parameters (100%).The drugs administered were dexamethasone and calcium gluconate (100%), paracetamol (78.6%) and metopimazine (7.1%). Transfusion history was significant, but no deaths were recorded.Conclusion: Transfusion reactions are not negligible at Labé Regional Hospital.Subsequent studies to assess the knowledge of healthcare staff and strengthen their ability to carry out good transfusion practice would help to reduce this frequency and improve the transfusion safety of patients at Labé Regional Hospital.
DéLAI DE CRéATION DE LA PREMIèRE fISTULE ARTéRIO-VEINEUSE POUR HéMODIALYSEAU SéNéGAL
Authors:   Service de néphrologie du CHN Dalal Jamm, Keita N , Sakho B , Faye M , Diagne S , Dieng A , Ba MA , Ba B , Mbengue M , Lemrabott AT , Faye M , Cissé MM , Kane Y , Ka EF , Niang A
Published: January 2024

Background: Arteriovenous fistula (AVF) is the preferred type of access with better survival of hemodialysis patients. Senegal has only one vascular surgery referral center. The aim of this study was to evaluate the time to creation of the first AVF in our hemodialysis patients.Patients and Method: A multicenter retrospective study was conducted over three months between August and October 2019 with retrospective collection of data from the files of chronic hemodialysis patients who had a first functional AVF, whether still functional or not. The estimation of the regression coefficients made it possible to determine the average times for creation of the first AVF.Results: During the study period, 107 patients had a first AVF, representing a prevalence of 56.3%. Thirty-three patients came from Aristide Le Dantec hospital, 33 from Pikine hospital, 13 from Diourbel hospital, 17 from Thiès hospital and 11 from Ziguinchor hospital. They had a median age of 43 years, nephrology follow-up before starting dialysis in 58%, emergency start of dialysis in 52% and preemptive AVF in 8%. Forty-eight percent of patients had family support in their care. The median length of time on dialysis was 13 (7 – 19) months before the creation of the first AVF. The difference in AVF creation time between patients at the Aristide Le Dantec hospital (located 7.3 km from the vascular surgery referral center) and patients at the Ziguinchor center (located 494 km) was 24. 62 [95% CI 11.63 – 37.61] months. The effects of age, sex, comorbidity, starting dialysis in an emergency situation, socio-economic level and mode of care were not significant.Conclusion: The waiting time for the creation of the first AVF is longer for patients at Ziguinchor hospital (the remote center). These results suggest the need for capacity of nonvascular surgeons and nephrologists for the creation of AVF.
SEROPREVALENCE DE LA TOXOPLASMOSE A DAKAR : éTUDE COMPARATIVE ENTRE LES DONNEURS DE SANG ET LES PATIENTS ATTEINT D’INSUFFISANCE RENALE CHRONIQUE
Authors: Seck MC , Mbow M , Gueye PAT , Ndour M , Coundoul B , Faye C , Diongue K , Engo PE , Sall I , Seck SM , Ndiaye M , Badiane AS , Ndiaye D
Published: January 2024

Introduction: Toxoplasmosis infection is not transmitted from human to human, except in the case of transmission from mother to fetus, blood transfusion, or transplantation of an infected organ. The aim of this study was to compare the seroprevalence of toxoplasmosis in blood donors and patients with chronic renal failure (CRF) treated at the Ouakam Military Hospital (HMO). Methodology: We conducted a cross-sectional study between September and December 2022 among CRF patients followed up at the HMO and blood donors. A questionnaire was administered to collect socio-demographic information. A blood sample was then taken. Toxoplasma gondii IgG and IgM antibodies were tested by chemiluminescence. Data were analyzed using Epi Info 7.2.5.0 software. Results: A total of 200 participants were enrolled, including 100 volunteer blood donors and 100 hemodialysis patients. The mean ages were 30.7 ± 10 years and 41.4 ± 14.6 years for blood donors and CRF patients respectively. The overall seroprevalence of toxoplasmosis in blood donors was 33%, whereas it was 38% in CRF patients. IgM antibody positivity was noted in only one patient. Seroprevalence of toxoplasmosis in blood donors was highest in the 31-44 age group, at 37.5%, while in CRF patients it was highest in the over-45 age group, at 45.2%. According to the notion of contact with a cat, it was higher in hemodialysis patients who had been in contact with a cat, with a rate of 57.9% (p=0.047), in contrast to blood donors, where the highest rate was recorded in subjects who had not been in contact with a cat. Conclusion: This study revealed that the seroprevalence of toxoplasmosis was higher in CRF patients than in blood donors, with a seroprevalence rate higher than those previously reported in Dakar in pregnant women.
ÉVALUATION DE L’ACTIVITE TRANSFUSIONNELLE DANS LA PRISE EN CHARGE THERAPEUTIQUE AU SERVICE D’HEMATOLOGIE DE L’HOPITAL IGNACE DEEN DU CENTRE HOSPITALIER UNIVERSITAIRE DE CONAKRY
Authors: Diakité M , Diallo I , Kanté AS , Koffi Brou H , Diallo AG , Traoré C , Traoré M , Doukouré AS , Condé A , Haba NY , Kourouma K
Published: January 2024

Introduction: Blood transfusion is an essential part of patient care. The aim of this study was to evaluate transfusion activity in daily therapeutic practice in the haematology department of Conakry University Hospital. Methods : This was a prospective descriptive study conducted over a period of six (6) months, from 1 January to 30 June 2021. All patients hospitalised in the haematology department of Ignace Deen Hospital in Conakry were included.Results : Out of a total of 511 hospitalised patients, 266 received at least one transfusion, i.e. 52%. The mean age of the patients was 47.34 ± 10.18 years, with a sex ratio of 1.1. The most common reason for consultation was dyspnoea (n=190, 71.4%), followed by abdominal pain (n=117, 44%). A history of transfusion was found in 22.9% of patients. The mean haemoglobin level was 5.9 ± 1.6 g/dl. Blood group O+ was in the majority 135(50.8%). Red cell concentrate was the most frequently transfused product, 243 (91.4%). The average number of bags transfused was 2.8 ± 1.3 bags. Twenty (20) cases of transfusion reactions were reported (7.5%). They included chills (80%), fever (45%), dyspnoea and headache. Transfusion was effective in 172 patients (64.6%). The demand for blood products was met in the case of RGCs and FFPs only. Conclusion : Transfusion is frequently used in our department, based essentially on RGCs and FFP, the demand for which is met with a good transfusion yield in the majority of cases. Measures to make all labile blood products available to cover the transfusion needs of a haematology department such as ours are more than necessary.