Synthesis, X-Ray Diffraction (XRD), Differential Thermal Analysis (DTA), and Scanning Electron Microscopy (SEM) of the Alloy (CuInTe2)1-x(NbTe)x with x=0.5

A polycrystalline ingot (30mm long, 10mm diameter) of the alloy (CuInTe2)1-x(NbTe)x with x=0.5 has been produced using the melt and anneal technique and characterized by X-Ray Diffraction (XRD), Diferential Thermal Analysys (DTA) and Scanning Electron Microscopy (SEM). From XRD results, and using Rietveld refinement method, the crystal structure has been obtained indicating than this alloy crystallizes in a chalcopyrite-like structure, space group  (Nº 112), unit cell parameters a = 6.1933(2) Å, c = 12.4293(2) Å, V = 476.75(2) Å3, figures of merit Rexp= 6.7%, Rp= 7.5%, Rwp= 7.3%, and S = 1.1. DTA measurements indicate three thermal transitions at 1028, 977 and 886 K in the heating cycle, and 1016, 900 and 848 K in the cooling. The transitions at 1028 and 1016 correspond to the melting and solidification point, respectively; the transitions at 977 and 900 K are of solid to liquid+solid type, whereas the transitions at 886 and 848 K correspond to order-disorder. The melting point is incongruent. In the diffraction pattern, traces of a secondary phase are observed; this phase has been identified using SEM technique as (CuIn)0.5NbTe2. DOI: http://dx.doi.org/10.17807/orbital.v14i1.167

Synthesis, X-Ray Diffraction (XRD), Differential Thermal Analysis (DTA), and Scanning Electron Microscopy (SEM) of the Alloy (CuInTe2)1-x(NbTe)x with x=0.5

A polycrystalline ingot (30mm long, 10mm diameter) of the alloy (CuInTe2)1-x(NbTe)x with x=0.5 has been produced using the melt and anneal technique and characterized by X-Ray Diffraction (XRD), Diferential Thermal Analysys (DTA) and Scanning Electron Microscopy (SEM). From XRD results, and using Rietveld refinement method, the crystal structure has been obtained indicating than this alloy crystallizes in a chalcopyrite-like structure, space group  (Nº 112), unit cell parameters a = 6.1933(2) Å, c = 12.4293(2) Å, V = 476.75(2) Å3, figures of merit Rexp= 6.7%, Rp= 7.5%, Rwp= 7.3%, and S = 1.1. DTA measurements indicate three thermal transitions at 1028, 977 and 886 K in the heating cycle, and 1016, 900 and 848 K in the cooling. The transitions at 1028 and 1016 correspond to the melting and solidification point, respectively; the transitions at 977 and 900 K are of solid to liquid+solid type, whereas the transitions at 886 and 848 K correspond to order-disorder. The melting point is incongruent. In the diffraction pattern, traces of a secondary phase are observed; this phase has been identified using SEM technique as (CuIn)0.5NbTe2. DOI: http://dx.doi.org/10.17807/orbital.v14i1.167

Moodle como herramienta e-learning en la educación superior: caso preguntas calculadas para estadística

Taking into account that the educational process requires carrying out evaluations to evaluate the learning results, which is not easy in fields related to mathematics such as statistics, since students are often required to carry out calculations or operations so that we can verify that the procedure is correct. The research is based on a qualitative approach, remember that according to this approach, descriptions can be made in the form of observations obtained through data collection methods such as interviews, questionnaires to observe the aspects to be studied and the characteristics of the phenomenon. Training in statistical reasoning is now the focus of most higher education academic courses, and universities are increasingly using digital tools to support this training, but they do not lend themselves well to variable numerical reasoning, limiting assessment to multiple choices. In response to the question, because some platforms allow you to develop specific math questions, but Moodle 3.9 contains four types of computational or numerical problems that allow you to create a more appropriate syllabus for assessment tools that involve solving equations. or numerical problems. This article examines the scope of online assessment and Moodle computational problems applied to statistics in the Systems Engineering program at Universidad Popular del Cesar. Finally, online assessment questionnaires can be shown to be appropriate and can support educational planning through technology and thus provide higher levels of compliance through the questionnaires through the use of information technology.Teniendo en cuenta que el proceso educativo requiere realizar evaluaciones para evaluar losresultados del aprendizaje, el cual no es fácil en campos relacionados con las matemáticas como la estadística, ya que muchas veces se requiere que los estudiantes realicen cálculos u operaciones para que podamos verificar que el procedimiento es correcto. La investigación se basa en un enfoque cualitativo, recordemos que según este enfoque se pueden realizar descripciones en forma de observaciones obtenidas a través de métodos de recolección de datos como entrevistas, cuestionarios para lograr observar los aspectos que se quieren estudiar y las características del fenómeno. La capacitación en razonamiento estadístico es ahora el enfoque de la mayoría de los cursos académicos de educación superior, y las universidades utilizan cada vez más herramientas digitales para respaldar esta capacitación, pero no se prestan bien al razonamiento numérico variable, lo que limita la evaluación a opciones múltiples. En respuesta a la pregunta, porque algunas plataformas te permiten desarrollar preguntas específicas de matemáticas, pero Moodle 3.9, contiene cuatro tipos de problemas computacionales o numéricos que le permiten crear un plan de estudios más apropiado para las herramientas de evaluación que involucran la resolución de ecuaciones o problemas numéricos. Este artículo examina el alcance de la evaluación en línea y los problemas computacionales de Moodle aplicados a las estadísticas en el programa de Ingeniería de Sistemas de la Universidad Popular del Cesar. Finalmente, se puede demostrar que los cuestionarios de evaluación en línea son apropiados y pueden respaldar la planificación educativa mediante la tecnología y así proporcionar niveles más altos de cumplimiento a través de los cuestionarios por medio del uso de las tecnologías de la información. &nbsp

Multiple Varicella Outbreaks on Cruise Ships Belonging to the Same Company

Transmission of infectious diseases on passenger ships is a well-known fact and efforts have been made to fight against it for years [...

COVID-19, Travel Companion: The Spanish Experience on Cruise Ships

Spain is a country with an important flow of cruises in Europe. Since the restarting of cruise activity, 1,106 events with 12,134 confirmed cases of COVID-19 were reported from 21 ports. 72.3% of cases and 73.7% of events were registered in the Balearic Islands, Barcelona, Tenerife and Las Palmas, ports with the highest number of layovers and passengers. The events reported increased from October 2021, with a peak in January and April 2022. The cases raised later, in December 2021 with two peaks in January and April and a substantial increase in June 2022. The peak of January coincides with the peak of COVID-19 cases registered in Spain and Europe. The increases in April and June 2022 coincides with the Easter period and the beginning of summer holidays

Libro de Proyectos Finales 2021 primer semestre

PregradoIngeniero CivilIngeniero de SistemasIngeniero ElectricistaIngeniero ElectrónicoIngeniero IndustrialIngeniero Mecánic