Relé multifuncional basado en microcontroladores 87C196KC

The design of a multifunctional numerical relay based on microcontrollers developed by the authors as undergraduate and postgraduate research works [6J. [8J. [16]. The specifications met by this relay, the mathematical developments for the obtaining of the electrical magnitudes, the protected protections, the general scheme of the hardware and a summary of the designed software are presented.Se presenta el diseño de un relé numérico multifuncional basado en microcontroladores desarrollado por los autores como trabajos de investigación de pregrado y posgrado[6J.[8J.[16].Se exponen las especificaciones cumplidas por este relé, los desarrollos matemáticos para laobtención de las magnitudes eléctricas, lasfimciones de protección soportadas, e! esquema generalde! hardware y un resumen de! software diseñado

Relé multifuncional basado en microcontroladores 87C196KC

The design of a multifunctional numerical relay based on microcontrollers developed by the authors as undergraduate and postgraduate research works [6J. [8J. [16]. The specifications met by this relay, the mathematical developments for the obtaining of the electrical magnitudes, the protected protections, the general scheme of the hardware and a summary of the designed software are presented.Se presenta el diseño de un relé numérico multifuncional basado en microcontroladores desarrollado por los autores como trabajos de investigación de pregrado y posgrado[6J.[8J.[16].Se exponen las especificaciones cumplidas por este relé, los desarrollos matemáticos para laobtención de las magnitudes eléctricas, lasfimciones de protección soportadas, e! esquema generalde! hardware y un resumen de! software diseñado

El emprendimiento en la formaci\uf3n integral del licenciado(a) en administraci\uf3n del Decanato de Administraci\uf3n y Contadur\ueda de la UCLA

La presente investigaci\uf3n se realiz\uf3 con docentes del decanato de administraci\uf3n y contadur\ueda de la UCLA, con el prop\uf3sito de determinar en que grado las asignaturas del plan de estudios del lcdo.(a) en administraci\uf3n generan habilidad de emprendimiento en su formaci\uf3n integral, clasific\ue1ndose en un dise\uf1o de campo con car\ue1cter descriptivo. En donde se seleccionaron 24 docentes pertenecientes al departamento de administraci\uf3n a los cuales se les aplic\uf2 un cuestionario, dando los resultados que fueron la base para las conclusiones y recomendaciones llegadas entre las cuales se concluyo que las asignaturas pertenecientes al plan de estudios del licenciado en administraci\uf3n contienen un grado muy alto en la formaci\uf3n integral del licenciado, desarrollando en el habilidades, destrezas y competencias que le permitan ser un profesional integro como tambi\ue9n se cree que es conveniente incorporar en las asignaturas de formaci\uf3n b\ue1sica la habilidad del emprendimiento de tal manera que contribuya a que el licenciado en administraci\uf3n obtenga un mayor conocimiento de la misma y desarrolle sus capacidades emprendedoras

Relé multifuncional basado en microcontroladores 87C196KC

The design of a multifunctional numerical relay based on microcontrollers developed by the authors as undergraduate and postgraduate research works [6J. [8J. [16]. The specifications met by this relay, the mathematical developments for the obtaining of the electrical magnitudes, the protected protections, the general scheme of the hardware and a summary of the designed software are presented.Se presenta el diseño de un relé numérico multifuncional basado en microcontroladores desarrollado por los autores como trabajos de investigación de pregrado y posgrado[6J.[8J.[16].Se exponen las especificaciones cumplidas por este relé, los desarrollos matemáticos para laobtención de las magnitudes eléctricas, lasfimciones de protección soportadas, e! esquema generalde! hardware y un resumen de! software diseñado

NR 33. Effect of phenolic compounds release from straw by ammonia treatment on fibrolytic microbial activity

The effect of release of phenolic compounds promoted by ammonia treatment of straw on rumen microbial action over structural polysaccharides was studied. Samples of barley straw (PC) and ammoniated straw (PT) were incubated in the rumen of sheep fed on either untreated straw plus urea (PU) or PT. Phenolics were solubilized in a higher extent from PT than from PC. Microbial adhesion was higher in PT as substrate (P<.001), and also with PT diet (P<.05), showing that phenolics had little influence on attachment mechanisms. Total polysaccharidase activity was higher in PT as substrate, but there was a fermentation lag between 4 and 8 h, until phenolics become metabolised. Total and specific enzymatic activity were higher in PU diet, showing that phenolic release inhibits enzyme synthesis and hydrolytic activity

NR 34. In vitro fermentation of lignocellulosic forages using different sources and levels of carbohydrates as supplement

The effect of the source and level of carbohydrate supplementation on microbial fermentation of roughages was studied in vitro by the gas production technique. Tested supplements (starch, A; pectin, P and cellulose, C) were included at 0, 15, 30, 45 and 60 % of the substrate (ammoniated straw, 200 mg) in duplicates. The amount of gas produced by the supplements themselves was substracted from the straw + supplement volume, according to the results of an additional set of incubation. Comparison among the effects of supplements was performed in pairs, in three sets of incubation. The higher amount of gas produced from straw was obtained with P (P<.05), whereas the effect of A was not different from C (P>.05). There was no negative response to increasing levels of P, but increases of A and C linearly reduced gas production from straw

Translation of natural language into algebra in high-school education.

Este estudio tiene como objetivo identificar las posibles causas o factores que intervienen y dificultan la transformación del lenguaje natural al lenguaje algebraico. Se basó en el enfoque cuantitativo y un diseño de investigación cuasi-experimental. Se trabajó con una prueba específica (objetiva) de cinco (05) ítems, basada en la utilización de un método de resolución de problemas, determinado en los contenidos de los programas de matemática de educación media general. Se dedujo que los estudiantes no poseen dominio en la resolución de problemas matemáticos que procedan de un lenguaje natural o común, que impliquen la elaboración de una expresión algebraica. Se sugieren unas recomendaciones pertinentes, tanto a estudiantes como a docentes, con la intensión de minimizar la problemática [email protected]@hotmail.comCuatrimestralThe objective of this paper is to identify factors that may hamper the process of translation of natural language into algebra. This is a quantitative research study with a quasiexperimental research design. A specific test (objective) of five items included a mathematics problem-solving question methodology, which was, in turn, based on the highschool mathematics syllabus. Results suggest that students are not skilled to translate natural language mathematics problems into algebraic expressions. Therefore, some relevant recommendations to teachers and students are made aiming at downgrading difficulties in this regard

Efect of "dry ammoniation" on the nutritive value of sorghum crop residue (Sorghum bicolor)

Con el objeto de evaluar el efecto del proceso de "amonificación seca" como método mejorador de la calidad de henos tropicales, se desarrolló un estudio en la Hacienda "La Esperanza" de la Universidad del Zulia. El efecto del tiempo de almacenamiento (14 y 21 días), volumen de agua (200 y 400 ml/Kg heno) y cantidad de urea (20, 40 y 60 g/kg heno), sobre el porcentaje Proteína Cruda (PC) y digestibilidad in vitro de la FND (DIVFND), se estudió con un arreglo factorial ([2 x 2 x 3] + 1 testigo[nivel 0 g/kg o heno sin tratar]) con tres repeticiones portratamiento. Mini-pacas de 0,8 kg, elaboradas a partir de varias pacas de soca de sorgo (Sorghum bicolor) se emplearon como unidad experimental. Tras añadir la solución de urea en recipientes plásticos (19 l), se introdujeron las mini-pacas, evitando el contacto con la solución, y se cubrió herméticamente con plástico para su almacenamiento bajo sombra durante 14 ó 21 días. La "amonificación seca" mejoró el valor nutritivo de la soca de sorgo, observándose incrementos en el porcentaje de PC (pasando de 5,2% a 9,3%) y en la DIVFND (pasando de 50,5 a 62,4%) al comparar el testigo con el promedio de los hemos tratados. A los 21 días de amonificación, con 400 ml de solución y a partir de 20 g urea/Kg heno, se observaron los valores mas altos de DIVFND (67,6%). Similar comportamiento se observó con la PC (11,9%), excepto para el factor tiempo que no arrojó diferencias (P>0,05).513 - 516BimestralThe "dry ammoniation" method was developed at "La Esperanza" farm, University of Zulia, Venezuela, located in a dry tropical area, as a need to improve the quality of tropical hays without the humidity problems observed with the wet technique. The effect of storage time (14 and 21 days), water volume (200 and 400 ml/Kg hay) and urea quantity (20, 40 and 60 g/Kg hay) on the crude protein content (CP) and in vitro digestibility of NDF (NDFIVD) were studied using a factorial arrangement design (2x2x3) + one control (non treated hay) with three replications per treatment. Small hay bales of 0.8 Kg, made from several commercial hay bales of sorghum crop residue (Sorghum bicolor), were used as experimental units. The urea solutions were added into plastic containers (19 l) before placing the hay, leaving a space of 5-8 cm between the hay and the solution. Thereafter the containers were covered hermetically with a plastic sheet and stored under a roofed area. The "dry ammoniation" improved the CP (5.2 to 9.3%) as well as the NDFIVD (50.5 to 62.4%).The highest values of NDFIVD (67.6%) and CP (11.9%) were found with 21 day of storage, 400 ml of solution and 20 g urea/Kg hay

Continuous Daily Evapotranspiration with Optical Spaceborne Observations at Sub-Kilometre Spatial Resolution

Evapotranspiration (ET) is a key parameter in the description of the energy and water fluxes over land. Continuous and spatially detailed ET simulations are thus required for a number of scientific and management-related purposes. These conditions are determined by the modelling approach and the composition of the forcing dataset. This study aimed at simulating daily ET in a diversity of climate and land cover conditions at a spatial resolution of ∼1 km and higher. The modelling approach was based on the algorithm driving the ET product developed and set in operations in the framework of the Satellite Application Facility on Land Surface Analysis programme (LSA-SAF). The implemented algorithm allowed the ingestion of biophysical parameters derived from SPOT-V and PROBA-V observations developed by the Copernicus Global Land Programme, as well as other model parameters at a similar spatial resolution. The model was tested at an ∼1 km spatial resolution in over 40 sites located in different climate and land cover contexts. The implementation at ∼300 m was tested in the upper Biebrza basin, in Poland. The simulations correlated well with the validation dataset (r2 > 0.75 in 80% of sites) and exhibited root mean squared values lower than 1 mm/day in 80% of the cases. The results also pointed to the need for refining the accuracy of soil moisture data sources, especially in dry areas. The results showed the ability of the modelling approach and the SPOT-V/PROBA-V missions to support the generation of long ET time series. They also opened the gate to incorporate Sentinel-3 in ET continuous modelling