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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.)

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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.)

Les questions du sens de l'École et de l'enseignement–apprentissage ont été posées en France lors de transformations fondamentales du système éducatif (massification et démocratisation scolaires, introduction des technologies de l'information et de la communication pour l'enseignement [TICE]), liées à des changements sociétaux profonds (évolutions socioéconomiques, émergence d'une culture juvénile). Elles concernent tant les élèves que l'ensemble des acteurs de l'éducation dont les repères ont été bousculés. Des problématiques ont pu émerger grâce à l'évolution des recherches sur les théories de l'action. Elles se sont intéressées à l'intentionnalité des acteurs comme à la finalité des actions situées et instrumentées. Nous nous interrogeons sur le rôle de la nouveauté, de l'innovation, comme une mise à l'épreuve du sens pour un sujet en rapport avec la question scolaire. Nous nous appuyons sur une revue de littérature pour aborder cette question en précisant ce que nous entendons par École, à partir du concept de forme scolaire. Nous proposons de l'articuler avec le concept de sens, dans le cadre d'une approche psychosociale en pensant le sens de l'École comme un système de significations (subjective, socio-anthropologique, axiologique, rationnelle). La fonction principale du sens est d'assurer la mobilisation du sujet, son maintien, et les conditions de sa cohérence. L'enjeu de notre recherche est de participer à la construction d'un modèle permettant d'accompagner le sujet vers la prise de conscience des éléments en jeu et des forces à l'œuvre. Il demande l'articulation avec d'autres disciplines permettant de le compléter et de l'affiner. The questions of the meaning of School and teaching–learning have been raised in France during fundamental transformations of the education system [school massification and democratization, introduction of information and communication technologies for education (ICTE)], linked to profound societal changes (socioeconomic changes, emergence of a youth culture). They concern both students and all education actors whose benchmarks have been shaken. Problems have emerged thanks to the evolution of research on action theories. They were interested in the intentionality of the actors as well as in the purpose of situated and instrumented actions. We wonder about the role of novelty, innovation as a test of meaning for a subject related to the school question. We rely on a literature review to address this question by specifying what we mean by School, based on the concept of school form. We propose to articulate it with the concept of meaning, within the framework of a psychosocial approach by thinking of the meaning of the School as a system of meanings (subjective, socio-anthropological, axiological, rational). The main function of meaning is to ensure the mobilization of the subject, its maintenance, and the conditions for its coherence. The challenge of our research is to participate in the construction of a model allowing to accompany the subject towards the awareness of the elements at stake and the forces at work. It requires coordination with other disciplines to complete and refine it. [ABSTRACT FROM AUTHOR]

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Copyright of Revista de Investigación is the property of Universidad Pedagogica Experimental Libertador 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.)

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The current work presents the deposition of TiC/ Inconel 625 metal matrix composites (MMC) coating through pre-placed powder bed laser cladding method using a Yb-Fiber laser, under two different conditions, with and without the application of ultrasonic vibration to the work-piece with frequency ranging from 28 to 34 kHz. The disintegration of the TiC particles and its distribution in the matrix was observed under various process parameters (laser power, scan speed and vibration frequency), and the microstructural changes were correlated with the molten pool lifetime obtained from the temperature history of the clad layer, captured using an IR-Pyrometer. The laser cladding without the application of vibration was conducted under constant and variable line energy to study the effect of laser interaction time and laser power on the microstructural evolution under fixed and variable heat flux. Higher molten pool lifetime (due to slow scan speed) at constant laser power resulted in higher disintegration of the MMC particles and formation of dendrites, whereas higher laser power under constant heat flux also resulted the same. Further, the application of ultrasonic vibration, specifically a higher vibration amplitude (at lower vibration frequency) was found to be responsible for more uniform distribution of TiC particles due to breaking of agglomerates, which led to higher hardness. [ABSTRACT FROM AUTHOR]

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Copyright of Magis: Revista Internacional de Investigación en Educación is the property of Pontificia Universidad Javeriana 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 Magis: Revista Internacional de Investigación en Educación is the property of Pontificia Universidad Javeriana 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.)

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• Transition from martensite to α phase in Ti6Al4V and composites, affected by solution temperature. • Microhardness peaks at 430 HV for Ti6Al4V, surging to 607 HV for composites. • Aging time significantly impacts α + β structure and mechanical properties. In this study, selective laser melting (SLM) technology was utilized to fabricate Ti6Al4V and TiC/Ti6Al4V composites. We then investigated the effect of the solution heat treatment temperature and aging time on the microstructural and mechanical properties of both the Ti6Al4V alloy and the TiC/Ti6Al4V composites. The findings showed that with an increase in the solution heat treatment temperature, the acicular martensite in the matrix of the Ti6Al4V alloy and the composites progressively transitioned into the plate-bar α phase. Concurrently, there was a distinct irregularity in the morphology of the β columnar grain boundaries, accompanied by an evenly enhanced and distributed β phase. With respect to hardness, the microhardness of Ti6Al4V initially displayed a slight drop with an increase in the solution temperature, followed by a significant increase, reaching a peak of 430 HV. In contrast, the composite materials exhibited an initial minor increase in microhardness followed by a substantial surge, with a maximum value of 607 HV. Post the aging treatment, the microhardness of the composite samples was observed to decrease from 463.2 HV to 362.7 HV. The aging time had a notable influence on the α + β structure, where the size of the martensitic α phase was constrained by the size of the β phase. This study revealed that an extension in the aging time resulted in an increased size of the strengthening phase, subsequently leading to a substantial reduction in the composite's microhardness. This underscored the pivotal role of aging time in defining the mechanical properties of the composites. [ABSTRACT FROM AUTHOR]

Copyright of Revista de Investigación is the property of Universidad Pedagogica Experimental Libertador 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.)

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