En el presente artículo se describe la determinación de metales pesados, a saber: cromo (Cr), cadmio (Cd) y plomo (Pb), en sedimentos superficiales de la cuenca baja del río Coata, considerado como la más importante arteria fluvial afluente del lago Titicaca en Perú. Se evaluó la contaminación de los cuerpos de agua, sedimentos y otros componentes de la diversidad ecológica. La determinación fue hecha en dos épocas del año, en avenida y en estiaje del año 2017 en cinco puntos estratégicos. El rango de concentraciones mínimo y máximo hallado fue de 4.10 mg/kg Cr, 0.10 mg/kg Cd, y 3.75 mg/kg Pb, y 28.42 mg/kg Cr, 0.70 mg/kg Cd, y 16.50 mg/kg Pb, respectivamente. Algunos valores mínimos hallados superan los mínimos aceptables establecidos en los Estándares de Calidad Ambiental para Suelo del Ministerio del Ambiente del Perú. Las posibles causas de la contaminación detectada son la acción antrópica con impacto en las aguas residuales de la ciudad de Juliaca, Perú. La cuantificación de estos elementos se realizó por espectroscopia de absorción atómica Método EPA.

Purpose:   The objective of the study was to determine the relationship between CSR and financial control; to achieve this, references were taken from different authors reviewing the state of the art with the purpose of an exhaustive understanding of the subject.   Methodology: The research was based on a quantitative approach, non-experimental, cross-sectional design and a sample of 60 private educational institutions. Data were collected through two instruments that counted with reliability and validity: the CSR instrument obtained a reliability of 0.824 and the financial control, a 0.821.   Conclusions: As a result, it was found that 96.7% of the promoters showed high social responsibility and financial control of the institutions in their charge. Likewise, a Spearman's Rho of 0.769 was obtained with a p= 0.000. It is concluded that there is a direct, significant and positive relationship between CSR and financial control; therefore, it was determined that educational institutions, under the supervision of the Local Educational Management Unit, improve their financial control.   Implications of the Research: The world is focused on how companies practice corporate social responsibility (CSR) due to the fact that economic activities, which each company exercises, affect society and the environment.

El test de Bender y las dificultades de aprendizaje en matemática de los estudiantes con necesidades especiales de la ciudad de Puno, PerúBender test and learning difficulties in mathematics of students with special needs of the Puno city, PeruVolumen 17, Número 3 Setiembre-Diciembre pp. 1-16Este número se publica el 1° de setiembre de 2017

The purpose of the research was to improve neuropsychological maturity in preschool children; to achieve this; a program of strategies that reinforced the levels of neuropsychological maturity was carried out. The research had a quantitative approach, hypothetical-deductive method and quasi-experimental design; a pre-test and post-test of the Cumanin questionnaire, a valid and reliable instrument, was applied to a sample of 450 students of the initial level. The research found differences between the levels of neuropsychological maturity in pre-school children before and after the application of the program. In this sense, it should be pointed out that before the application of the program, 13.1% were at the beginning level, 72.2% were in process and 14.7% were at the achieved level; after the application of the program, 6.2% of the children were at the beginning level, 72.2% were in process and 21.6% were at the achieved level, which means that the children were at the beginning level, 72.2% were in process and 21.6% were at the achieved level. Therefore, it was concluded that the program generates a positive effect on psychomotor skills in preschool children, since highly significant differences were evidenced (z= -16.065; p<0.000).