Search

The Fe-(TiC, Mo) composite coating was laser clad onto the surface of Q235 steel, and the study delved into the impact of (TiC, Mo) content (x) on the coating’s microstructure, microhardness, wear resistance and corrosion resistance. The results revealed that as x varied from 0 to 10, 20 and 30 wt.%, the phase composition shifted from α-Fe to α-Fe+γ-Fe+TiC. This transition was accompanied by a constant variation in the proportion of different phases, with a continuous increase in in situ TiC particle content. The microhardness, wear resistance, and corrosion resistance of the coating displayed an initial increase followed by a subsequent decrease with the increase in x, reaching their optimal values at 20 wt.%. This enhancement in microhardness and wear resistance, up by 4.34 and 8.27 times, respectively, can be attributed to fine crystal strengthening, dispersion strengthening, and solid solution strengthening. Furthermore, the incorporation of (TiC, Mo) in the coating facilitated the formation of a dense and uniform passivation film, while grain refinement mitigated the galvanic corrosion effect. As a result, the coating exhibited remarkable corrosion resistance. [ABSTRACT FROM AUTHOR]

This study investigates the corrosion resistance and wear behaviour of aluminium matrix composites (AMCs) manufactured through the ultrasonic-assisted stir-casting technique. These composites were synthesized by introducing titanium carbide (TiC) and nickel (Ni) into aluminium alloys (AA6061). The X-ray diffraction results confirmed the presence of α-Al, TiC and Al3Ni phases within the composites. Microstructural examination demonstrated an uniform dispersion of TiC particles and dispersion of Al3Ni along grain boundaries. To evaluate the corrosion behaviour, samples were subjected to immersion tests and electrochemical techniques, including potentiodynamic polarization and electrochemical impedance spectroscopy (EIS), in a 3.5 wt% NaCl solution. Immersion tests indicated that the composites exhibited slower dissolution rates than base AA6061 alloys. Potentiodynamic polarization results revealed that the inclusion of TiC and Ni reinforcements enhanced corrosion resistance, with TiC having a more pronounced influence. The EIS tests suggested that the composites had higher charge-transfer resistance than AA6061 alloys. After conducting corrosion tests, scanning electron microscope (SEM) images of the base AA6061 alloys unveiled the presence of deep pits but the inclusion of reinforcements resulted in the shallow pits. In addition, Vickers hardness tests and pin-on-disc wear tests were conducted to investigate hardness and wear properties. Notably, hybrid composites containing 3% TiC and 3% Ni exhibited a substantial 42.18% increase in hardness as compared to the base alloy. These hybrid composites also demonstrated superior wear resistance, with a wear rate that was 58.6% lower compared to AA6061 alloy and 41% less than that of the 3% Ni-reinforced composite. [ABSTRACT FROM AUTHOR]

Copyright of Revista Electrónica Interuniversitaria De Formación del Profesorado is the property of Asociacion Universitaria de Formacion del Profesorado (AUFOP) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of EnvironmentAsia is the property of Thai Society of Higher Education Institutes on Environment and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Planning Education & Research is the property of Sage Publications Inc. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This study presents a comprehensive analysis of the morphology, mechanical properties, erosion resistance, and machine learning modeling of Si 3 N 4 +TiC + VC and CrNi based ceramic coatings deposited via plasma spraying. The cross-sectional morphology analysis revealed good mechanical interlocking between the coatings and the substrate, with pores predominantly observed in the Si 3 N 4 +TiC + VC coating. The coating thicknesses were measured as follows: 260 μm for Si 3 N 4 +TiC + VC, 243 μm for Si 3 N 4 +TiC + VC blended with CrNi, and 232 μm for pure CrNi coating. Mechanical characterization showed that microhardness values ranged from 1933 HV for Si 3 N 4 +TiC + VC coating to 499 HV for pure CrNi coatings. Slurry erosion tests demonstrated that pure Si 3 N 4 +TiC + VC coating exhibited superior erosion resistance at 90° impingement angle compared to other coatings. Additionally, a rigorous evaluation of over 20 machine learning regression models revealed that Gaussian Process Regressors and Artificial Neural Network (ANN) with a layer size of 20, displayed satisfactory performance in modeling mass loss prediction. The erosion mechanisms observed in the coatings provided valuable insights into their response to slurry erosion, highlighting the influence of coating composition and impingement angles. The findings underscore the potential of Si 3 N 4 +TiC + VC ceramic coatings to enhance the erosion resistance of stainless steel, offering promising applications in various industries. [Display omitted] [ABSTRACT FROM AUTHOR]

Copyright of Environmental & Social Management Journal / Revista de Gestão Social e Ambiental is the property of Environmental & Social Management Journal and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Foco (Interdisciplinary Studies Journal) is the property of Revista Foco and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Turkish Journal of Child & Adolescent Mental Health / Çocuk ve Gençlik Ruh Sagligi Dergisi is the property of Galenos Yayinevi Tic. LTD. STI and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Metal Working (1674-165X) is the property of Metal Working Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In this study, TiC particle-reinforced high-manganese-steel (Mn18Cr2) matrix composites were successfully prepared using an in-situ method, and a millimeter micrometer dual-scale architecture was constructed in the composites to further enhance their mechanical properties. The effects of different moderator contents in the precursor on the size, volume fraction, mechanical properties, and impact wear resistance of the generated TiC particles were primarily investigated. The results showed that the moderator considerably influenced the microstructure and mechanical properties of the composites. As the moderator content increased, the size, volume fraction, mechanical properties, and wear resistance of TiC particles decreased. The optimal comprehensive performance of the composites was obtained when the moderator content was 20 wt%., average TiC particle size was 1.21 μm, volume fraction was 64.9 %, bulk hardness was more than three times that of the matrix, compressive strength was ∼2 GPa, and relative wear resistance was 2.47 times that of the matrix. The main wear behaviors of composites included grooves, microcutting, pits, and plastic deformation. In conclusion, this study guides the design and synthesis of steel matrix composites with tunable in-situ ceramic particle sizes and volume fractions to enhance wear resistance. [ABSTRACT FROM AUTHOR]

Geocaching is an activity that involves hiding or finding treasures (geocaches) anywhere with the help of GPS or geolocation. This work consists of the design, development and evaluation of a socioeducational practice, using a mobile device as a tool and a geolocation application as an instrument. The aim of this study is to find out the impact of the implementation of an educational practice in the municipal context to raise environmental awareness and improve digital literacy using geolocation. This proposal is part of the socio-educational area in the information society, within the field of child protection, specifically in a day care centre for minors. This research is qualitative, in particular it is a multiple case study and is framed within the narrative approach. The results and conclusions show that the children and the professionals involved are satisfied with the implementation of the socio-educational practice in the municipal context, with entertainment predominating as a positive aspect. The children have acquired mainly procedural knowledge, with the support of digital technology. Finally, it is worth mentioning the impact on motivation and conflict resolution. [ABSTRACT FROM AUTHOR]

This study seeks to analyse, through teachers' perceptions, the impact of the digital divide and the relationships of educational inclusion in the use of Information and Communication Technologies (ICT) in education. The study also aligns with Sustainable Development Goal 4 of the United Nations' 2030 Agenda, which promotes inclusive and quality education. A quantitative methodology was used, employing a specially designed and validated Likert scale to measure teachers' perceptions in three dimensions: perceptions of the digital divide's effects on teaching; perceptions of the inclusive use of technologies in the classroom and inclusive education practices in the classroom. Altogether, 790 primarylevel teachers from western Honduras participated. The results indicate that perceptions are limited on the digital divide's effects among the participating teachers. Likewise, differences were found in how older teachers perceive the inclusive integration of technologies in the classroom. Furthermore, the participating teachers primarily demonstrated a theoretical understanding of inclusive education practices. These findings indicate the existence of an improved awareness and practical understanding of technological integration and inclusive strategies in the educational context. [ABSTRACT FROM AUTHOR]

Copyright of Revista Interuniversitaria de Formación del Profesorado is the property of Asociacion Universitaria de Formacion del Profesorado (AUFOP) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Edmetic: Revista de Educación Mediática y TIC is the property of EDMETIC Revista de Educacion Mediatica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Teoría de la Educación. Revista Interuniversitaria is the property of Ediciones Universidad de Salamanca and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Educación XX1 is the property of Editorial UNED and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This study focuses on Fe-based laser cladding coatings containing varying levels of four elements, and the objective is to investigate the influence of TiC addition on the microstructural evolution, microhardness, wear resistance, and corrosion resistance of these Fe-based composite coatings. Fe/TiC composite coatings were prepared by incorporating 20 wt.% TiC into four types of Fe-based coatings. The coatings were characterized using X-ray diffraction (XRD), optical microscopy for microstructural observation, microhardness testing, friction and wear tests, and electrochemical analysis. The results indicate that the phases of the coatings are primarily composed of α-Fe and Cr7C3. Upon the addition of TiC, the TiC and Ni3Ti phases were observed in the coatings. The coatings mainly consist of columnar crystals, dendritic structures, equiaxed grains, and cellular structures, with petal-shaped TiC particles distributed within the coating matrix. TiC effectively enhances the microhardness and wear resistance of the coatings. The average microhardness of the coatings increased from 455.8 ± 20.8 HV0.2 to 802.8 ± 41.6 HV0.2 with TiC addition. Simultaneously, the wear rate of coating A2 decreased from 1.51 × 10−6 g/(N·m) to 1.02 × 10−7 g/(N·m), indicating an order of magnitude improvement in wear resistance. However, TiC destroys the denseness of the Fe coating, the current corrosion density increases by 28% on average, and the corrosion resistance decreases significantly. [ABSTRACT FROM AUTHOR]

Copyright of RIED: Revista Iberoamericana de Educación a Distancia is the property of Revista Iberoamericana de Educacion a Distancia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Alteridad: Revista de Educación is the property of Universidad Politecnica Salesiana and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Alteridad: Revista de Educación is the property of Universidad Politecnica Salesiana and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Lograr transformaciones cualitativas en el proceso de enseñanza - aprendizaje como consecuencia de un amplio y generalizado empleo de las TIC ha sido una de las premisas en la actual transformación curricular llevada a cabo en la Educación Superior, estos cambios han de expresarse fundamentalmente en la renovación de concepciones y prácticas pedagógicas que impliquen reformular el papel del profesor y desarrollar modelos de enseñanza - aprendizaje distintos a los tradicionales. Es precisamente, en este entorno educativo, donde aparecen los conceptos de las TAC y las TEP con el objetivo de reorientar el empleo de las TIC hacia un desarrollo formativo y colaborativo, tanto para el estudiante como para el profesor. El presente trabajo tiene como objetivo proponer la aplicación educativa sobre amplificadores operaciones (OpEdu) en su versión 0.5 como forma organizativa de integración de las TIC – TAC – TEP en el proceso de enseñanza – aprendizaje de la carrera de ingeniería eléctrica de la Universidad Tecnológica de la Habana José Antonio Echeverría, a partir de las actuales trasformaciones curriculares. La aplicación está basada en el software libre Scilab y permite el análisis, la experimentación, demostración y diseño de las funciones de los amplificadores operacionales. Dentro de los resultados obtenidos se encuentran el desarrollo del diseño de siete módulos, además permite que los estudiantes sean capaces de realizar de forma independiente sus propios experimentos y diseños en un ambiente seguro. Con el desarrollo de la aplicación se facilita un mayor acceso entre los estudiantes y especialistas a fines.

El mundo, en general, está sujeto a cambios, los procesos docentes no están exentos a ellos, más bien, constituyen desafíos, debido a la necesidad de utilizar la modalidad a distancia o semipresencial, un ejemplo de ello fue la pandemia Covid 19 donde se hizo uso de las Tecnologías de la Información y la Comunicación (TIC) para afrontar la situación, lo que significó que el proceso formativo pasara a ser presencial a virtual. Para ello se requiere un rediseño curricular, sin perder la esencialidad de contenidos, manifestándose en la necesidad de la determinación de los nodos y nexos interdisciplinarios del contenido, así como de ejemplos de ejercicios que pueden ser trabajados con los estudiantes mediante el aprendizaje basado en problemas. Estas transformaciones establecen nuevas metodologías con responsabilidad individual en su propio desarrollo y va a unido a la disertación del proceso evaluativo, en el que la tarea docente es la célula principal. En este trabajo se abordarán los fundamentos y peculiaridades que caracterizan al rediseño curricular, teniendo en consideración las condiciones del contexto histórico-social, el enfoque interdisciplinar y el empleo de las TIC en la modalidad a distancia o semipresencial, lo que posibilita mejorar la calidad y la flexibilidad del proceso docente desde lo curricular. Como resultado principal se reconoce la utilidad de la propuesta para mejorar el proceso de enseñanza – aprendizaje, potenciar el desarrollo de habilidades en los con un enfoque interdisciplinario mediante el aprendizaje basado en problemas y mediado por entornos virtuales de aprendizaje.

[Objetivo] El objetivo de este artículo es presentar los resultados de la implementación de un diseño instruccional de enseñanza de la derivada para estudiantes universitarios de la carrera de Ingeniería Comercial en Chile. [Metodología] Las personas participantes del estudio son noventa estudiantes de la asignatura de Cálculo Aplicado a los Negocios de una universidad chilena. El diseño metodológico, basado en las herramientas del Enfoque Ontosemiótico del Conocimiento e Instrucción Matemáticos, considera diversas configuraciones epistémicas en las situaciones-problemas sobre tangentes, el cálculo de derivadas a partir de reglas de derivación, aplicaciones de la derivada para el cálculo de máximos y mínimos y análisis de gráficas de funciones. Además, integra las TIC en las diversas tareas. [Resultados] Los resultados indican que la propuesta instruccional de enseñanza de la derivada supera algunas de las dificultades de aprendizaje de los y las estudiantes, evidenciadas en diversas investigaciones. En particular, las dificultades del estudiantado de Ingeniería Comercial en torno a la concepción euclidiana de la recta tangente; la interpretación de la función “derivada” y su representación geométrica, la optimización de funciones económicas y la aplicación de la derivada a funciones marginales. [Conclusiones] Se concluye que el proceso de enseñanza y aprendizaje es eficaz, en el sentido de que se consigue el aprendizaje del alumnado de una carrera de ingeniería específica mediante la incorporación, en la instrucción, de diferentes configuraciones epistémicas de la derivada interconectadas, sus diferentes campos de problemas y las aplicaciones contextuales en su profesión, junto al uso de recursos TIC.

BackgroundComprehensive Behavioral Intervention for Tics (CBIT) is a first-line treatment for tic disorders that aims to improve controllability over tics that an individual finds distressing or impairing. However, it is only effective for approximately half of patients. Supplementary motor area (SMA)-directed neurocircuitry plays a strong role in motor inhibition, and activity in this region is thought to contribute to tic expression. Targeted modulation of SMA using transcranial magnetic stimulation (TMS) may increase CBIT efficacy by improving patients' ability to implement tic controllability behaviors.MethodsThe CBIT + TMS trial is a two-phase, milestone-driven early-stage randomized controlled trial. The trial will test whether augmenting CBIT with inhibitory, non-invasive stimulation of SMA with TMS modifies activity in SMA-mediated circuits and enhances tic controllability in youth ages 12-21 years with chronic tics. Phase 1 will directly compare two rTMS augmentation strategies (1 Hz rTMS vs. cTBS) vs. sham in N = 60 participants. Quantifiable, a priori "Go/No Go Criteria" guide the decision to proceed to phase 2 and the selection of the optimal TMS regimen. Phase 2 will compare the optimal regimen vs. sham and test the link between neural target engagement and clinical outcomes in a new sample of N = 60 participants.DiscussionThis clinical trial is one of few to date testing TMS augmentation of therapy in a pediatric sample. The results will provide insight into whether TMS is a potentially viable strategy for enhancing CBIT efficacy and reveal potential neural and behavioral mechanisms of change.Trial registrationClinicalTrials.gov NCT04578912 . Registered on October 8, 2020.

The advantage of combustion synthesis is the ability to produce composites from powders in a single technological step, using the heat of an exothermic reaction, in a fast and energy-efficient manner. Ceramic-metal composites TiC–High-Entropy Alloy (HEA) CoCrFeNiMn were fabricated by combustion synthesis from granular mixtures. The content of the metal binder components varied from 10 to 30 wt% and the combustion velocity and temperature gradually decreased as the binder content increased. Scaling up synthesis requires clarification of the parametric range for implementing a safe combustion mode. The impurity gas content and the range of safe conductive combustion were determined from known theoretical models and experimental combustion velocities of samples of granules of 0.6 and 1.1 mm size. The main phases of the product were titanium carbide with up to 3 at. % Cr and HEA CrCoFeNiMn with a reduced Mn content compared to the equimolar composition. The content of secondary phases Cr 7 C 3 and carbon did not exceed 5 wt%. The use of granular mixtures solved the problem of significant sintering of exothermic powder mixtures containing metal binder during combustion. After synthesis, the granules retain their size and do not sinter together, making it easy to grind the sample and obtain a TiC-HEA composite powder. [ABSTRACT FROM AUTHOR]

Laser Chemical Vapor Deposition (LCVD) is a process in which fibers are deposited from a gaseous precursor to a solid phase under a traversing laser focal point. Here, we grow titanium carbide (TiC) fibers and tubes dependent upon a hyperbaric hydrogen-rich, hydrogen-balanced, and hydrogen-lean environment referenced to a titanium tetrachloride and ethylene gas mixture under three different laser intensities. X-ray diffraction confirms the deposition of TiC with energy dispersive spectroscopy noting a radial compositional gradient of titanium and carbon in the diameter of the deposit. Depending on the hydrogen concentration, the TiC encased a core carbon-rich fiber or formed a hollow tube, with these formations explained by thermophoresis. Furthermore, depending on the gas mixture and laser intensity, the carbon-rich interior and TiC outer shell exhibited different morphologies that are discussed in terms of growth rate regimes. The collective outcomes demonstrate the complex processing space in forming ceramic materials by LCVD. [ABSTRACT FROM AUTHOR]

Copyright of Retos: Nuevas Perspectivas de Educación Física, Deporte y Recreación is the property of Federacion Espanola de Asociaciones de Docentes de Educacion Fisica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

En los últimos años la sociedad ha cambiado de una forma vertiginosa: las costumbres, los estilos de vida y los procesos de enseñanza-aprendizaje han evolucionado a gran velocidad, abocando a la población a enfrentarse continuamente a lo desconocido. Es aquí donde surge la necesidad de incorporar las tecnologías de la información y la comunicación en la educación de los futuros ciudadanos, haciéndoles partícipes de su propio proceso de enseñanza-aprendizaje a través de las llamadas metodologías activas. Sin embargo, no hay que olvidar la necesidad de desarrollar situaciones de aprendizaje que persigan el desarrollo sostenible en edades tempranas, como en Educación Infantil cuando el contacto del alumnado con el entorno es esencial y beneficioso. Para ello, se realiza una investigación cualitativa basada en la revisión bibliográfica sobre el concepto de gamificación y educación sostenible para, finalmente, exponer una serie de experiencias gamificadas que trabajan los objetivos de desarrollo sostenible y sus resultados. Tras todo ello, se llega a la conclusión de que la gamificación es una metodología que puede contribuir a desarrollar los ODS desde los primeros años debido a que promueve una sociedad consciente, responsable y comprometida en cuanto a la sostenibilidad.

Frente al creciente interés en nuevas alternativas de enseñanza y de aprendizaje surgen aquellas que se basan en juegos digitales. Esta investigación aporta evidencia empírica sobre la percepción de estudiantes de secundaria respecto a su intención de usar videojuegos educativos. Para ello, se puso a prueba un modelo que integra variables de la Teoría Unificada de Aceptación y Uso de la Tecnología versión 2, y elementos del juego. Los datos se recogieron a través de un cuestionario en línea aplicado a una muestra de 407 estudiantes colombianos de secundaria, de 14 a 18 años de edad. Se utilizó un modelado de ecuaciones estructurales de mínimos cuadrados parciales. Los resultados permitieron identificar los factores que tienen influencia positiva en la intención de continuar jugando y en el disfrute percibido, los cuales podrían conducir al éxito en experiencias futuras similares.

Se describieron las competencias en información digital de los estudiantes de la Facultad de Ciencias Económicas de la Universidad de Holguín. El estudio tuvo un enfoque cuantitativo-descriptivo utilizando una muestra de 180 estudiantes universitarios. Se empleó la encuesta como instrumento de recolección de datos y el cuestionario. Los resultados revelan una percepción moderada por parte de los estudiantes de las diferentes carreras de la facultad. La carrera de Turismo muestra mejores resultados seguido por las carreras de Economía y Contabilidad y Finanzas. Los resultados más discretos son para Educación Economía. Las principales dificultades se centran en áreas como el manejo eficiente de la información digital, el empleo de las bases de datos especializadas y el dominio de las habilidades referidas a la ética y privacidad de la información digital.

La educación en tecnología en la escuela básica permite al estudiante adquirir destrezas que le faciliten relacionarse con un entorno equipado de artefactos de uso diario; cuando un niño con discapacidad intelectual llega al aula regular por medio del programa de inclusión, la institución debe realizar las adaptaciones necesarias de acuerdo con las características individuales para que él pueda alcanzar el éxito en su proceso escolar. Dentro de este contexto un recurso educativo digital (RED), apoya el aprendizaje y el desarrollo de habilidades en esta población porque contiene elementos audiovisuales y facilita la repetición de la información. El presente artículo describe la contribución de un RED, en el desarrollo de la competencia en tecnología para dos niños con síndrome de Down (SD), que cursan segundo grado de primaria en un colegio oficial de Bogotá, Colombia; mediante una investigación de enfoque cualitativo, exploratorio, a través del estudio de caso. Los resultados indican que los niños SD desarrollan la habilidad para reconocer y utilizar de forma apropiada, los aparatos tecnológicos que encuentran en su ambiente cotidiano, con el RED, donde intervienen aspectos como el aprendizaje, comunicación, memoria, motivación, interacción, autonomía y seguridad.

En este trabajo se analiza el uso de las TIC en el proceso de enseñanza-aprendizaje de las asignaturas de emprendedurismo de la carrera de Diseño Gráfico en la Universidad Don Bosco de El Salvador y su aporte al fomento de futuros emprendedores. El trabajo se realizó bajo un enfoque investigativo de acción participativa, la investigación se desarrollará en busca de la mejora de una labor educativa, la investigación se desarrollará dentro de una institución educativa, siendo esta la Universidad Don Bosco de El Salvador, tomando en cuenta la carrera de licenciatura en Diseño Gráfico y consultando a 40 alumnos entre el cuarto y el quinto año de estudios. El método de muestreo utilizado fue no probabilístico por conveniencia, con el fin de crear muestras de fácil acceso, con quienes tengan la mejor disponibilidad de participar en la muestra dentro de un intervalo de tiempo determinado. Se consultó a los alumnos su valoración en diferentes áreas como la enseñanza aprendizaje, el emprendedurismo, las tecnologías de la información, todo dentro del marco de sus estudios en las materias relacionadas al emprendedurismo. Se utilizaron como instrumentos cuestionarios en línea y entrevistas a profundidad. Como principales resultados, se obtuvieron las opiniones de alumnos y docentes en relación con su experiencia, obteniendo resultados positivos en cuanto a la asimilación de contenidos donde son utilizados diferentes herramientas TIC además de identificar áreas de mejora y oportunidades para fomentar un aprendizaje más completo y mejorar la experiencia educativa.

El presente artículo analiza la manera en que las Tecnologías de la Información y la Comunicación (TIC), siendo herramientas creadas para el desarrollo de una educación incluyen-te, resultan excluyendo de manera recurrente a las personas y comunidades más vulnerables que adolecen de los recursos necesarios para acercarse al conocimiento. Siendo una realidad poco tratada, rememora el desafío que representó para las Instituciones de Educación Superior (IES) mantenerse funcionales ante una pandemia en donde hubo la necesidad atropellada de migrar todo proceso de enseñanza hacia la implementación de mediaciones tecnológicas para poder sobrellevar las implicaciones de tan inusual contingencia. Enfatiza en la importancia que tiene tanto para estudiantes como para cuerpos profesorales, desenvolverse en entornos digi-tales dentro de espacios académicos mayoritariamente presenciales, dado que las mediaciones tecnológicas potencializan los procesos de enseñanza-aprendizaje, siempre que se mantenga claro, que la inclusión no solo implica garantizar un cupo para quien lo desee sin importar sus necesidades educativas especiales, sino garantizar acceso a la educación pese a sus dificultades económicas, geográficas, o tecnológicas.

Ti-6Al-4V alloy is widely used in aerospace and chemical equipment manufacturing due to its good strength, plasticity, toughness, corrosion resistance and weldability, but its hardness and abrasion resistance are not high enough to limit its service life under frictional wear conditions to some extent. Ti-6Al-4V alloy homogeneous cermet cladding layer with TiC-added phase was additively prepared based on the optimized process method of laser cladding, and the strengthening effect of TiC enhancement with respect to the cladding layer microstructure as well as the basic mechanical properties was characterized and verified. The results show that the main phases of the cladding layer include α-Ti, β-Ti and TiC, of which TiC is supersaturated and precipitated within the cladding layer. Due to the difference in the supercooling degree at different locations of the cladding layer, the precipitated TiC is mainly in the form of fine particles at the top of the cladding layer, while it is mainly in the form of dendrites and petals in the middle of the cladding layer. The bottom of the cladding has a new wheat spikes precipitation shape, while no significant TiC precipitation is seen in the dilution zone. The average microhardness of the cladding layer is 530HV0.5, which is 61% higher than that of the substrate; the average friction coefficient of the cladding layer is 0.3583 at 35 N load, which is 11% lower than that of the substrate, and the volume wear rate is about 87% that of the substrate, and the wear is in the form of adhesive wear and abrasive wear.

In this article, wear and microstructure behaviors of dissimilar Al–Mg joints made by friction stir welding (FSW) with the addition of TiC nanoparticles under different welding parameters were investigated. Optimal joining conditions were achieved by a combination of various rotational and traverse speeds and the best microstructure evolution, mechanical properties, and tribological behaviors were achieved for specimens joined at rotational and traverse speeds of 850 rpm and 50 mm/min, respectively. It was shown that the TiC particles play a prominent role in the microstructure modification and enhanced mechanical properties of weld samples due to the recrystallization process and pinning effect. The maximum hardness and strength values of 241 HV and 168 MPa, respectively were obtained for the weld sample made by optimal condition. The friction coefficient and wear volume loss for weld samples fabricated at 850 rpm and 50 mm/min is comparatively less compared to other conditions due to the highest grain refinement, homogenous distribution of particles, and highest hardness characteristics. The major wear happened because of adhesion, abrasion, plastic deformation, delamination, and oxidation.

In order to solve the softening problem of welding heat affected zone (HAZ) for Cu-bearing steel caused by the dissolution of Cu-rich particles, TiC was utilized to induce the Cu-rich re-precipitation. With the peak temperature increased from 780 °C (ICHAZ) to 950 °C (FGHAZ), the size of 9R–Cu increases from 4 nm to 5 nm, accompanied with the increment of volume fraction from 0.6% to 1.0%. Phase field simulations indicate that TiC repels Cu atoms into γ-Fe matrix and promotes the formation of Cu-rich clusters. Then, Cu-rich clusters provide more nucleation sites for Cu-rich particles, which contributed to the re-precipitation of refined 9R–Cu. Due to the disappearance of coarse grain boundary Cu-rich particles and formation of fresh lath bainite, re-precipitated Cu-rich particles provided precipitation strengthening value of 237 MPa and 298 MPa without decreasing the low temperature toughness for ICHAZ and FGHAZ. The yield strength and absorbed energy at −40 °C of HAZs exceed 1000 MPa and 120J, respectively.

Abstract Disposable bamboo chopsticks (DBCs) are difficult to recycle, which inevitably cause secondary pollution. Based on energy and environmental issues, we propose a facile strategy to fabricate floatable photocatalyst (fPC) coated onto DBCs, which can be flexibly used in water purification. The photocatalyst of titania and titanium carbide on bamboo (TiO2/TiC@b) was successfully constructed from TiC-Ti powders and DBCs using a coating technique followed heat treatment in carbon powder, and the fPC exhibited excellent photocatalytic activity under visible light irradation. The analysis results indicate that rutile TiO2 forms on TiC during heat treatment, achieving a low-density material with an average value of approximately 0.5233 g/cm3. The coatings of TiO2/TiC on the bamboo are firm and uniform, with a particle size of about 20–50 nm. XPS results show that a large amount of oxygen vacancies is generated, due to the reaction atmosphere of more carbon and less oxygen, further favoring to narrowing the band gap of TiO2. Furthermore, TiO2 formed on residual TiC would induce the formation of a heterojunction, which effectively inhibits the photogenerated electron–hole recombination via the charge transfer effect. Notably, the degradation of dye Rhodamine B (Rh.B) is 62.4% within 3 h, while a previous adsorption of 36.0% for 1 h. The excellent photocatalytic performance of TiO2/TiC@b can be attributed to the enhanced reaction at the water/air interface due to the reduced light loss in water, improved visible-light response, increased accessible area and charge transfer effect. Our findings show that the proposed strategy achieves a simple, low-cost, and mass-producible method to fabricate fPC onto the used DBCs, which is expected to applied in multiple fields, especially in waste recycling and water treatment.

In this study, K2TiF6 and C powder (Ti:C atomic ratio 1:1) are introduced into Al-Si-Fe alloy by contact reaction method. The focus of this study is to investigate the reaction and precipitation behavior of Ti source in the alloy melt, and the effect of reaction products on the microstructure and properties of Al-Si-Fe alloy. The results show that the reaction products formed between Ti and the matrix alloy can destroy the acicular β-Fe phase in the original alloy. The transformation results in the a morphological change of the alloy from needle-like structure to Chinese script and fishbone-like structure, which effectively improves the mechanical properties of the alloy. The DSC analysis results indicate that Al-Si- Fe powder, K2TiF6 powder, and C powder undergo significant exothermic reactions at around 950 °C, corresponding to the formation of TiC. Further microscopic morphology observations support the inference that TiC powders formed in this temperature range. Firstly, the synthesis of the matrix takes place at 580 °C. K2TiF6 mixed with alloy powder shows an obvious exothermic peak at 660 ℃, corresponding to the formation of the second phase Al3Ti by wetting and chemical reaction. However, it is worth noting that the reaction intermediate product(Al4C3 phase) consumes three times as much Al3Ti as itself. As a result, the exothermic peak generated by Al3Ti disappears. Lastly, a long-term exothermic reaction that takes place above 850 °C lead to the gradual replacement of the Al3Ti phase by TiC particles. The mechanical properties test indicates that the needle-shaped Al3Ti to some extent deteriorates the alloy's properties. But the final product (TiC) can offset the deteriorating effect of Al3Ti and restore the alloy's property. [ABSTRACT FROM AUTHOR]

Video games are considered a source of information that can generate more dynamic learning. In addition, it is framed in the perspective of action promoted by the Common European Framework of Reference for Languages, which means that they become an innovative and updated tool for teaching. The aim of this work is to analyze the benefits that video games can provide as a tool for our university students in language subjects, specifically French as a foreign language (FLE). For this purpose, we will make a tour of the most useful video games in order to obtain the basic notions and thus facilitate their integration in the educational context. It is necessary to renew to be able to motivate and to make students of the higher levels reflect is necessary to be able to train competent people. [ABSTRACT FROM AUTHOR]

In present work, hybrid flexible nanostructures of titanium carbide (TiC)/silicon carbide(SiC) doped polyvinyl alcohol(PVA) were fabricated as promising nanomaterials to utilize in various optoelectronics applications. The optical, structural, and dielectric properties of (PVA–TiC–SiC) nanocomposites (NCs) films have been investigated. The obtained results indicated that the increasing of TiC/SiC NPs improve the alternating-current(A.C) conductivity, dielectric constant, and dielectric losses of PVA. The dielectric constant and dielectric losses reduced while the A.C electrical conductivity enhancement when the frequencies increased. The results of optical properties showed the absorbance of pure PVA was rise of 98% with adding 6 wt% of TiC/SiC NPs and the optical conductivity increased of 99%, this performance is benefit for photocatalysis, diodes, optoelectronics, and solar cells applications. The energy gap reduced for allowed and forbidden transitions approximately 86% and 73%, respectively, with adding 6 wt% of TiC/SiC NPs. By adding of TiC/SiC NPs, the other optical factors of (PVA–TiC–SiC) nanocomposites were improved with a broad range of photon energy and this make them as potential nanomaterials for photonics applications. Finally, the findings showed that (PVA–TiC–SiC) nanostructures are attractive materials for promising optoelectronic nanodevices. [ABSTRACT FROM AUTHOR]

TiC bonded diamond composites were prepared from a mixture of Ti, graphite, and diamond powders as raw materials, with Si as sintering additives, through high-temperature and high-pressure (HTHP) technology. The reaction between Ti and graphite under 4.5–5 GPa pressure and 1.7–2.3 kW output power can produce TiC as the main phase. The diamond particles are surrounded by TiC, and the interface is firmly bonded. The coefficient of friction (COF) of TiC–diamond composites with POM and PP balls decreases with increasing load for a specific friction velocity. However, the COF of TiC–diamond composites with agate, Cu and Al balls increases with the rising load because of the enhanced adhesive wear effect. The COF of PP, Cu and Al balls slightly increases with the increase in friction velocity at a certain load. SEM results show that the surface of agate balls has rough, pear-shaped grooves and shallow scratches. The scratches on the surface of POM balls are wrinkled. The PP balls have pear-shaped groove scratches on their wear surfaces. The wear mechanism of TiC–diamond composites with Cu ball pairs is primarily adhesive wear. The abrasion of TiC–diamond composites with Cu ball pairs remains almost unchanged as the load increases. However, the depth and width of the pear-shaped grooves on the wear surface of TiC–diamond composites are significantly increased. This phenomenon may be attributed to the high rotational speed, which helps to remove the residual abrasive debris from the friction grooves. As a result, there is a decrease in both the depth and width of the pear-shaped grooves, leading to a smoother overall surface. The wear mechanism of TiC–diamond composites with Al ball pairs is abrasive wear, which increases with an increasing load. When the load is constant, as the speed increases, the wear morphology of TiC–diamond composites with Al ball pairs transitions from rough to smooth and then back to rough again. This phenomenon may be attributed to the wear mechanism at low speeds being groove wear and adhesive wear. As the speed increases, the wear particles are more easily removed from the wear track, leading to a reduction in abrasiveness. As the speed increases, the wear surface becomes roughened by a combination of grooves and dispersed wear debris. This can be attributed to the increased dynamic interaction between surfaces caused by higher speed, resulting in a combination of abrasive and adhesive wear. In addition, Cu and Al ball wear debris appeared as irregular particles that permeated and adhered to the surface of the TiC phase among the diamond particles. The results suggest that TiC–diamond composites are a very promising friction material. [ABSTRACT FROM AUTHOR]

The remelting of Fe‐xTiC metal matrix composites (MMCs) is studied using the sessile drop method. This is to determine the conditions needed for the complete dissolution of TiC precipitates in the Fe‐based melt. Samples with different amounts of TiC (2, 3.5, and 5 wt%) are analyzed in a hot‐stage microscope (HSM), capturing the softening and melting temperatures. A Cr‐alloyed steel is selected as a matrix. Consequently, the presence of TiC elevates the melting initiation temperature above the melting point of pure iron (e.g., 1659 ± 10 °C for Fe‐5TiC). Furthermore, samples with higher TiC amounts exhibit higher melting initiation temperatures. This trend is confirmed by differential scanning calorimetry measurements, conducted on the representative Fe‐xTiC samples. Microstructural examinations of the solidified (HSM) samples identify two distinct TiC precipitate morphologies: primary blocky/cubic and secondary eutectic plate like. For instance, the Fe‐5TiC sample contains numerous blocky/cubic precipitates (7.5 ± 3.1 μm) clustered at the upper cross‐ section, while secondary plate‐like precipitates (20.4 ± 11.8 μm) are uniformly distributed in eutectic assemblies with the matrix. This study provides meaningful insights for optimizing the production of as‐cast and as‐atomized Fe‐TiC MMCs, particularly in selecting reinforcement levels and homogenization temperatures for complete TiC dissolution. [ABSTRACT FROM AUTHOR]

Owing to the harsh working condition, the ZrO 2 –C materials used in the slag line in the submerged entry nozzle are confronted with serious slag erosion. In order to solve this issue, different amounts of TiO 2 addition ranging from 0 to 6 wt% are added and their effects on the erosion resistance of ZrO 2 –C materials in addition to phase composition, microstructure, physical properties and high-temperature mechanical properties are investigated in this work. When the sintering temperature is above 1400 °C, fine TiC grains and SiC whiskers are in-situ formed and distributed around ZrO 2 particles, which can reinforce the matrix and improve the strength of ZrO 2 –C materials. With the amount of TiO 2 addition increasing, the cold strength of ZrO 2 –C materials increases while the high-temperature strength slightly decreases. Combining with the erosion resistance, the optimum amount of TiO 2 in ZrO 2 –C materials is determined to be 4 wt%, in which the cold compressive strength (46.13 MPa), the cold modulus of rupture (35.12 MPa) and the residual strength after thermal shock (15.01 MPa) reach the maximum. Based on this, the promotion mechanism of erosion resistance is further discussed with aid of molecular dynamics simulation. [ABSTRACT FROM AUTHOR]

The high-temperature interaction between molten gray cast iron and Ti + C substrates that are composed of titanium and graphite powders was investigated by the sessile drop method combined with the non-contact heating of an alloy/substrate couple to a test temperature of 1330 °C in an inert gas atmosphere (argon). During the high-temperature testing, the images of the couple were recorded by a high-speed high-resolution CCD camera and used for estimating the values of the contact angles over time. An analysis of the wettability kinetics of the different Ti + C substrates by molten cast iron as well as a detailed structural characterization of the solidified couples with the help of light microscopy, electron microscopy (SEM, TEM), X-ray diffraction, and energy-dispersive X-ray spectroscopy have allowed us to explain the mechanism of high-temperature interaction in the selected couples. It was evidenced that the good wetting and fast infiltration of all of the examined substrates with the selected alloy had a reactive nature due to the dissolution of the Ti and graphite in the molten alloy (dissolutive wetting) and the reactively formed wettable TiC phase. These high-temperature phenomena contributed to the formation of three metal-infiltrated zones with different amounts and distributions of TiC particles in the Fe-based matrix. [ABSTRACT FROM AUTHOR]