El presente trabajo presenta la simulación de las celdas solares BC-BJ, con variación (50 μm; 100 μm) y movilidad de un segundo contacto en el emisor, la inclusión de un segundo contacto variable y siendo este movido a través del emisor presenta un mejoramiento en la eficiencia en un punto medio de la celda.
El rendimiento académico de un estudiante se ha asociado a diversos factores personales, sociales e institucionales. El objetivo de esta investigación es determinar los factores que inciden en el rendimiento académico de los estudiantes del curso de ecuaciones diferenciales. Para evaluar el impacto de este trabajo se aplicaron técnicas multivariantes como la regresión logística binaria y el análisis discriminante. Se determinó que las variables tiempo semanal dedicado a la asignatura, tutorías que ayudan a solventar dudas, frecuencia con que desarrollan las actividades académicas, y la frecuencia con la que realizan las tareas contribuye significativamente en el rendimiento académico. A pesar del impacto positivo de esta investigación, aún quedan desafíos por resolver uno de ellos es determinar las estrategias y programas que tienen como finalidad mejorar el desempeño y permanencia de los estudiantes en una institución de educación superior.
The feasibility of the using of mucilages as viscous hydrocolloids in order to reduce dependence on inorganic products that are unfriendly to the environment, is a necessity that the scientific community must take advantage on behalf of development of new products. The aim was to determine the phytochemical components and thickening capacity of mucilage as a hydrocolloid in a shampoo formula. Phytochemical sieve was done by coloration, precipitation and flotation reactions. Mucilage extraction was performed by hydration-maceration of crushed stems according to experimental design (three factors and two levels) and controlled by the viscosity response variable. For the shampoo, a design of was used (two factors and two levels), evaluated with viscosity response variables and lather formation, results that were tabulated with the statistical software statgraphics plus. The results show in the hydrocolloid the presence of tannins, alkaloids, triterpenes. Its thickening capacity due to the significant viscosity of the hydrocolloid (1186 mPa.s). The viscosity of the shampoo between 1020 and 1460 mPa.s and the amount of foam (213 ml) that reward the quality. It is concluded that, the complex molecular structure and abundant presence of mucilage in its natural state in the stems of Malachra alceifolia Jacq allows the hydrocolloid obtained to have a great viscosifying and moisturizing capacity with an almost neutral pH, qualities that affect the quality of the shampoo and are suitable for commercial products with friendly features to the environment; being promoted as a raw material for formulations of other personal hygiene products with an important projection of immediate application in the pharmaceutical and cosmetic industry.
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