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63  Articles
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In this paper we describe the pattern of creation and destruction of Chilean firms between 1999 and 2006. In addition, we construct transition matrices among different firm sizes based on tax information. It has to be noted that the available data for thi... see more

With the rapid development of urban rail transit (URT) system, many new lines are put into operation. The change of network topology and the improvement of accessibility cause obvious changes in URT passenger flow characteristics, especially for the entra... see more

Una vía para el proceso de comprensión de la información científica / A way for the process of understanding scientific information Una vía para el proceso de comprensión de la información científica / A way for the process of understanding scientific informationObjetivo: evaluar la efectividad de los ejercicios para el proceso de comprensión de la información científica.Materiales y métodos: se emplearon métodos del nivel teórico entre los que se encuentran. Analítico-sintético, histórico-lógico, sistémico-estructural, modelación y del nivel empírico como el estudio documental, la observación y la prueba.Resultados: la prueba de entrada demostró que en los grupos donde se aplicó el experimento los estudiantes tienen un bajo nivel de habilidades en la comprensión de la información científica y los resultados de la prueba de salida demostraron la efectividad del sistema de ejercicios aplicado porque se produjo un salto cualitativo en cuanto al dominio de las habilidades para la comprensión científica.Conclusiones: el estudiante del curso Preparatorio presenta dificultades en la comprensión del texto científico y la aplicación del sistema de ejercicios contribuyó a la adquisición de habilidades en el trabajo con esta tipología textual.ABSTRACTObjetive:to evaluate the effectiveness of the exercises for the process of understanding scientific information.Materials and methods: Methods of the theoretical level were used among those found. Analytical-synthetic, historical-logical, systemic-structural, modeling and empirical level such as documentary study, observation and testing.Results: the entrance test showed that in the groups where the experiment was applied the students have a lowlevel of skills in the understanding of the scientific information and the results of the exit test demonstrated the effectiveness of the applied exercise system because it was produced a qualitative leap in terms of mastering the skills for scientific understanding.Conclusions: the student of the preparatory course presents difficulties in the understanding of the scientific text and the application of the exercise system contributed to the acquisition of skills in the work with this textual typology.Keywords: understanding; Scientific information.

Materiales y métodos: se emplearon métodos del nivel teórico entre los que se encuentran. Analítico-sintético, histórico-lógico, sistémico-estructural, modelación y del nivel empírico como el estudio documental, la observación y la prueba.Resultados: la p... see more

The use of geochemical normalizers has been applied in sedimentological studies in several study contexts, such as pollution, diagenetic and provenance assessment. Selected textural and mineralogical data of 137 surface sediment samples were compared by s... see more

RESUMEN: El objetivo de esta investigación es analizar errores de lectura en inglés –cometidos por alumnos españoles de segundo de bachillerato en la prueba de acceso a la universidad- detectando los problemas de comprensión mediante la observación y el d... see more

Aspects of robotics technology have now been able to explore and reach the entertainment, education, and health.  Making robots with privileges and special expertise is closely related to the needs of the modern world that requires a device with a hi... see more

Within the framework of the traffic analysis of the intersection under consideration, micro simulation is performed with the PTV Vissim tool under various scenarios to provide solutions to the problems identified through the aforementioned tool. In this s... see more

Abstract This research aims to evaluate the effect of fluid flow rate on the effectiveness of radiator performance by using nanofluid. The research began by making a series of test kits consisting of radiators, flowmeters, pumps, pipes, heaters and f... see more

The highway is a mode of land transportation that plays a critical role in linking communities. With an increase in the number of people and the number of activities carried out by the local community, a variety of issues occur, causing traffic delays, no... see more

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