308 research outputs found

    IMPACTO DE LA VIRTUALIZACI脫N DE LA INSCRIPCI脫N A EXAMENES FINALES EN LA CALIDAD DE LA INFORMACI脫N EN LA UNIVERSIDAD NACIONAL DE LUJ脕N

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    La aplicaci贸n de las Tecnolog铆as de la Informaci贸n y la Comunicaci贸n (TIC麓s) a la mejora del servicio que se ofrece a los estudiantes, puede ser considerada como parte de los objetivos que plantea la UNESCO para la Gobernabilidad Electr贸nica. En la Universidad Nacional de Luj谩n (UNLu) se han ido aplicando las TIC麓s para mejorar los servicios que requieren los estudiantes para el desarrollo de su actividad acad茅mica. El 煤ltimo de los servicios, de acceso masivo, que fue automatizado mediante TIC麓s fue la inscripci贸n a ex谩menes finales. De esta manera, los estudiantes se inscriben para rendir examen utilizando una aplicaci贸n WEB sin necesidad de acercarse hasta alguna de las Sedes de la UNLu. Este servicio, implementado desde el mes de Mayo de 2011, hizo presuponer que los estudiantes se inscribir铆an indiscriminadamente para rendir examen final a todas las asignaturas para las que cumplieran con los prerrequisitos acad茅micos. De producirse este efecto, se afectar铆a la calidad de la informaci贸n necesaria para la planificaci贸n de los ex谩menes produciendo diversos inconvenientes al desarrollo del turno. Partiendo de ese supuesto, y habiendo transcurrido m谩s de tres a帽os desde que se implement贸 la inscripci贸n WEB, nos planteamos verificar si efectivamente la implementaci贸n de la inscripci贸n a ex谩menes finales por internet redujo la calidad de la informaci贸n, lo que se manifestar铆a con el incremento del n煤mero de estudiantes ausentes a las mesas de examen. Comparamos la tasa de ausentismo por turno de examen para ambos sistemas de inscripci贸n, el presencial y el sistema de inscripci贸n WEB puesto en operaci贸n desde Mayo de 2011, encontrando que no se produjo un aumento significativo del n煤mero de ausentes por turno, producto de la virtualizaci贸n de la inscripci贸n. Solo encontramos un incremento del 11% de ausentes en el turno adicional correspondiente al mes de Mayo

    Systematic review: Analysis of the use of D-limonene to reduce the environmental impact of discarded expanded polystyrene (EPS)

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    The article presents a systematic review on the use of D-limonene with the aim of analyzing its efficiency to reduce the environmental impact of expanded polystyrene (EPS). Initially, an analysis of the life cycle of the EPS was carried out in a general way to identify the stage where the greatest impact on the environment is evident. Subsequently, primary sources were examined that raise the issue of reducing EPS using this green solvent, in view of the fact that it generates sustainability through recycling, optimization and application of various methods that could allow the circular economy of this waste in order to be applied in the industrial field and contribute to the socio-environmental aspect. Finally, the importance of this solvent was demonstrated according to the analysis and evaluation of each EPS recycling examining country

    Evaluating Snow and Ice Cover in Tierra del Fuego, Argentina

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    Evaluating changes in snow and ice cover is an important field for studying climate change and its impacts. This evaluation is commonly done using remote sensing because of its ability to evaluate large areas. The purpose of this study is to determine the reliability of one remote sensing technology, the Moderate Resolution Imaging Spectroradiometer (MODIS), by comparing it to in-situ snow and climate data from the weather station at the Austral Center for Scientific Research (CADIC). Data was converted from daily to monthly averages and was sorted into a series of graphs to compare the two data sets. Correlations were calculated between the MODIS data and the CADIC data. The analysis determined that MODIS snow cover data correlated moderately to in-situ snow depth data and temperature data. This concludes that MODIS is a reliable source for evaluating snow cover in areas where in-situ data is unavailable

    Evaluating Snow and Ice Cover in Tierra del Fuego, Argentina

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    Evaluating changes in snow and ice cover is an important field for studying climate change and its impacts. This evaluation is commonly done using remote sensing because of its ability to evaluate large areas. The purpose of this study is to determine the reliability of one remote sensing technology, the Moderate Resolution Imaging Spectroradiometer (MODIS), by comparing it to in-situ snow and climate data from the weather station at the Austral Center for Scientific Research (CADIC). Data was converted from daily to monthly averages and was sorted into a series of graphs to compare the two data sets. Correlations were calculated between the MODIS data and the CADIC data. The analysis determined that MODIS snow cover data correlated moderately to in-situ snow depth data and temperature data. This concludes that MODIS is a reliable source for evaluating snow cover in areas where in-situ data is unavailable

    Fecundity limits in Frangula alnus (Rhamnaceae) relict populations at the species' southern range margin

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    The geographic range of many temperate plant species is constrained by climate, but it remains little known how climate affects population performance at low-latitude range margins. This study investigated the reproduction of the Eurasian tree Frangula alnus in relict populations near its southwestern range limit in southern Spain. The aim was to identify the principal stages and causes of ovule loss experienced by these marginal populations. More than 6,800 flowers were monitored over 2 years, insect observations and different experiments were carried out to assess levels of pollen and resource limitation, as well as the influence of flowering phenology on seed production. Most ovule losses occurred during flower anthesis and were due to strong cross-pollen limitation. Fruit set was affected by tree size, light regime and flowering phenology, probably through their effects on pollinator behaviour. Fruit set was almost zero throughout the first half of the flowering season. Then it increased paralleling changes in pollinator abundance but was soon overridden by increasing ovule desiccation due to summer drought. Successful seed production was mostly confined to a brief period near the end of the flowering season. Adverse weather during this period in the second study year resulted in a threefold bud and flower mortality and a 50% decrease of fruit production. Spring rainfalls in southwestern Spain have diminished more than 30% through past decades leading to an earlier onset of summer drought. This trend and its adverse effects on seed production may contribute to explaining the recent decline of F. alnus at its southwestern range limit. 漏 Springer-Verlag 2005.Peer Reviewe

    3-30-300 RULE: ADAPTATION TO A PERUVIAN COASTAL DESERT CITY

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    Assessing the distribution of green spaces and urban trees is a challenge mainly in Latin American cities, either due to a lack of technical staff or economic resources. The 鈥3-30-300 Rule鈥 is an approach designed within the European context to quickly assess the supply of urban greenery. It considers the minimum number of trees visible from homes (3), the percentage of canopy cover (30), and the distance to people to access green spaces (300). This study aimed to adapt this Rule to a city in the Peruvian coastal desert, contributing to the agile, continuous, and low-cost monitoring of urban greenery. The methodology was tested in the district of Barranco - Lima and involved adapting each of the three indicators of the rule based on the physical characteristics of the urban fabric and the climatic context. A scoring system was proposed to quantitatively identify the areas with the highest urban green deficit. The results suggest that the 鈥3-30-300 Rule鈥 could be adapted to the Barranco district due to its flexibility to adjust to different spatial and climatic contexts and its low technical and financial requirements for its calculation. However, the main challenge remains the availability of quality data to enable the procedure to be replicated over time.聽Esta p谩gina est谩 en English聽Traducir al Spanish聽聽聽聽AfrikaansAlbanianAmharicArabicArmenianAzerbaijaniBengaliBulgarianCatalanCroatianCzechDanishDutchEnglishEstonianFinnishFrenchGermanGreekGujaratiHaitian CreoleHebrewHindiHungarianIcelandicIndonesianItalianJapaneseKannadaKazakhKhmerKoreanKurdish (Kurmanji)LaoLatvianLithuanianMalagasyMalayMalayalamMalteseMaoriMarathiMyanmar (Burmese)NepaliNorwegianPashtoPersianPolishPortuguesePunjabiRomanianRussianSamoanSimplified ChineseSlovakSlovenianSpanishSwedishTamilTeluguThaiTraditional ChineseTurkishUkrainianUrduVietnameseWelsh聽Traducir siempre del English al SpanishPRO No traducir nunca del English No traducir nunca del revistas.ufpr.b

    Riesgo en la Salud por Niveles de Plomo en Suelo del Distrito de San Juan de Miraflores

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    Este trabajo de investigaci贸n se enfoca en el riesgo a la salud por niveles de plomo en el suelo, para ello se sabe que el Per煤 es el cuarto pa铆s a nivel mundial que produce mayor cantidad de plomo. Este metal es gris azulado que se puede hallar en la naturaleza y con otros metales (la plata, el cobre y el zinc). El plomo se encuentra principalmente en la fabricaci贸n de bater铆as para autos, tambi茅n es usado en materiales de construcci贸n, soldadura, municiones y pigmentos sint茅ticos, etc. (Sociedad Nacional de Miner铆a Petr贸leo y Energ铆a, 2019) La intoxicaci贸n debido a este metal tiene consecuencias en la salud, siendo los m谩s afectados los infantes porque ellos se encuentran expuestos a las pinturas de casa, edificios (sobre todo viviendas antiguas); en los juguetes de bajo precio, en el polvo de la casa y la tierra. Se realiz贸 este trabajo por el inter茅s de conocer la concentraci贸n del plomo en el distrito de San Juan de Miraflores y tambi茅n para conocer como estos niveles es un riesgo a la salud a la poblaci贸n. La metodolog铆a usada para est谩 investigaci贸n sobre la toma de muestra se da seg煤n los antecedentes recopilados y la gu铆a de muestreo de suelo del Ministerio del Ambiente 鈥 Per煤, luego se utiliz贸 la fluorescencia de rayos X (XRF port谩til) para analizar la concentraci贸n de plomo de los puntos muestreados, posteriormente se realiz贸 el an谩lisis de espectrofotometr铆a de absorci贸n at贸mica para los puntos que se dio la mayor concentraci贸n de plomo. La investigaci贸n tuvo la finalidad de determinar la concentraci贸n de plomo en suelo y compararlo con los niveles establecidos por el Est谩ndar de Calidad Ambiental para suelo (ECAsuelo), fijados por el Ministerio del Ambiente 鈥 Per煤. Con ello, se elaboro un mapa de riesgo de los niveles de plomo en suelo del distrito San Juan de Miraflores, logrando obtener datos para otros posibles estudios en dichos lugar.Trabajo de suficiencia profesiona
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