Evolución de la atención, concentración y rendimiento académico tras una intervención basada en descansos activos

El objetivo principal de la investigación ha sido analizar la evolución de la atención y concentración en jóvenes estudiantes, tras la implementación de un programa basado en descansos activos o Activity Breaks en la asignatura de Lengua Castellana y Literatura. La muestra, compuesta por 31 estudiantes, 14 chicas y 17 chicos, del primer curso de la Enseñanza Secundaria Obligatoria (edad media 12.13 años), se dividió en dos grupo clase: grupo control y grupo experimental. La intervención, de 7 semanas, implementada durante las lecciones en el aula, permitió aumentar la cantidad de actividad física diaria. Mediante el instrumento de medida “Test de atención D2”, se midió la atención y la concentración, y a través de un texto dictado el rendimiento ortográfico, los datos se recogieron tanto en la fase previa, como tras la intervención. Los resultados indican un aumento estadísticamente significativo tanto en la variable atención como en la variable concentración en el grupo experimental. En cuanto a los contenidos relativos a Lengua Castellana y Literatura, ortografía, no se observaron diferencias estadísticamente significativas. The main objective of the research has been to study the evolution of attention and concentration after the implementation of a programme based on Activity Breaks in the subject Spanish Language and Literature. The sample, formed by 31 students, 14 girls and 17 boys, from the first course o Compulsory Secondary Education (average age 12.13 years), was divided into two class groups, control group and experimental group. The intervention, of 7 weeks, implemented during the lessons in the classroom, allowed the amount of daily physical activity to be increased. By the measurement instrument “Attention Test D2” attention and concentration and by the text dictated spelling performance was measured, data was collected in the previous phase and after the intervention. The results indicate a statically significant increase in attention and concentration variable in experiential group. Regarding the Spanish Language and Literature contents, orthography, no statistically significant differences were observed.

The Influence of Corporate Governance on Intellectual Capital Disclosure: Evidence from Bank on Indonesian Stock Exchange 2015-2019

The purpose of this study was to examine the effect of Corporate Governance on Intellectual Capital Disclosure. The sample used in this study consisted of 22 banking companies listed on the Indonesia Stock Exchange in 2015-2019. The data used is in the form of an annual report. The sampling technique in this study was to use purposive sampling. This study uses multiple regression analysis. The statistical analysis results show that partially the audit committee and external auditor variables have a significant positive effect on intellectual capital disclosure. Meanwhile, the independent commissioner variable has no significant effect on intellectual capital disclosure. The ownership concentration variable harms intellectual capital disclosure. Simultaneously, the variables of the independent commissioner, ownership concentration, audit committee, and external auditor have a significant effect on intellectual capital disclosure.

The influence of the non-linear diffusion on the mass transfer of a packaging contaminant into foodstuffs

The unsteady mass transfer of the packaging constituents to a food has been analysed. The diffusion coefficient inside the packaging was considered concentration - variable while the food was considered concentration spatially gradientless. A well-known technique (Kirchhoff transformation) was used to solve the non-linear mass balance equation. The influence of the non-linear diffusion on the mass transfer mechanism and rate was analysed for different values of the partition coefficient and dilution coefficient.

EFFECT OF EXCLOSURE ON RUNOFF, SEDIMENT CONCENTRATION AND SOIL LOSS IN EROSION PLOTS

Nowadays watershed and rangeland management projects play the important rolein water resources and soil management worldwide. Although watershed andrangeland management projects have the considerable importance as approaches torural areas development and natural resources management, more studies havebeen focused on their effects on sediment and their effects on soil erosion haverarely been considered. The present study was conducted in two treated and controlsub-watersheds with exclosure treatment and under grazing respectively, inKhamsan representative watershed with an area of 4337.27 ha in south ofKurdistan Province, Iran. Three plots were installed in each western, northern andeastern slopes for the runoff volume and coefficient, sediment concentration andsoil loss measurement. The exclosure treatment was operated for installed plots intreated sub-watershed from 2007. Then, all the data of runoff volume andcoefficient, sediment concentration and soil loss from USLE standard plots in bothcontrol and treated sub-watersheds for 52 events over the years 2009 to 2014 werecompared and evaluated. Therefore, in order to the number of plots and subwatersheds,18 USLE standard plot data were finally recorded and analysed foreach storm event. The results showed the significant (p≤0.05) decreasing effect ofexclosure treatment on runoff volume, sediment concentration and soil loss at plotscale. Finally, decreasing rates of 15.68, 6.13, 16.67, 24.37 and 21.43% due toexclosure respectively for runoff volume and coefficient, sediment concentration,soil loss and sediment yield were obtained. The variables of runoff volume, soilloss and sediment yield had statistically significant differences (p≤0.05) in treatedand control sub-watersheds. The sediment concentration variable had p value of0.058 and therefore the effect of exclosure treatment on sediment concentrationwas also significant (p≤0.06).

Dependence of the Ionization Energy of Phosphorous Donor in 4H-SiC on Doping Concentration

4H-SiC implanted with high dose of phosphorus has been shown to exhibit lower sheet resistance than 4H-SiC implanted with high dose of nitrogen. In this paper, we have implanted various doses (1x1014cm-2, 2x1014cm-2, 1x1015cm-2 and 4x1015cm-2) of phosphorus into 4H-SiC in order to extract the ionization energy of phosphorus in 4H-SiC as a function of the doping concentration. Variable temperature Hall effect measurements were performed in the temperature range from 60-600K. Least square fits using the charge neutrality equation with two donor levels were used to extract the ionization energies and donor concentrations from the measured data. The ionization energies for both, the hexagonal (53meV, 49meV and 26meV) and the cubic (109meV, 101meV and 74meV) site decreased as the donor concentration (5x1018cm-3, 9.8x1018cm-3 and 3.4x1019cm-3) increased.

Traitement d'effluents de tannerie-mégisserie par microfiltration tangentielle

Dans ce travail un procédé de traitement des effluents issus de l'unité de préparation des peaux des animaux au tannage (travail en rivière) en tannerie-mégisserie a été étudié en utilisant la technique de microfiltration tangentielle sur membrane minérale en céramique. Les performances de ce procédé en terme de flux de filtration et de rendement épuratoire dépendent aussi bien des paramètres hydrodynamiques de filtration que de la qualité des effluents (collectés en été et en printemps) issus des différents bains de traitement et de rinçage des peaux dans l'atelier de rivière. Le flux de filtration varie entre 15 l/h.m2 pour l'effluent de printemps et 90 l/h.m2 pour l'effluent d'été. Les paramètres hydrodynamiques optimaux ont également été déterminés: la vitesse de circulation U=3 m/s, la pression transmembranaire Ptm=2 bar et la température T=43°C. L'étude de la microfiltration à concentration variable conduit à des facteurs de concentration volumique (FCV) de 6,5 pour l'effluent de l'été et de 2,4 pour l'effluent de printemps.