1,575 research outputs found

    La Utopía De Heidegger

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    RESUMEN El objetivo del presente trabajo es proponer un nuevo concepto de utopía.  Para ello, nos apoyaremos en la crítica a la modernidad de Heidegger, la cual abordaremos destacando los aspectos ideológicos de ciencia, técnica, economía y lenguaje. ABSTRACT The aim of this paper is to propose a new concept of utopia. To do this, we will rely on the critique to the modernity of Heidegger, which will address highlighting the ideological aspects of science, technology, economy and language.

    Risco climático para a ocorrência de requeima da batata na região andina da Venezuela

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    Potato is an important crop for Venezuelan agriculture. However, its production is highly affected by late blight (Phytophtora infestans), since weather is commonly favorable for this disease. The aim of this study was to determine the sowing dates of low climatic risk for potato late blight in the Andes region of Venezuela, with an agrometeorological disease model and geographical information system (GIS) tools. The disease model used in this study was developed by Hyre (1954) which requires daily rainfall and temperature data which were obtained from 106 weather stations, located at the States of Mérida, Táchira, and Trujillo, for a period of 31 years. Hyre's model was applied for all stations obtainig the following variables: number of disease favorable days (DFD); number of periods with ten consecutive favorable days, named disease occurrence (O); and number of sprays required for disease control (S). These variables were used to calculate the Maximum Risk Index (MRI) and the Probable Risk Index (PRI). The interpolation of these indexes was used to generate maps of climatic risk for each sowing date. MRI and PRI maps showed that the highest climatic risk for potato late blight occurrence was during the rainy season, from May to July, decreasing during dry and mid seasons. However, high disease risk variability was observed for all seasons. The maps generated by coupling an agrometeorological disease model and GIS also show that in great part of potato areas of Andes region the number of sprays could be reduced, but more investigations about that must be carried out.A batata é uma importante cultura para a agricultura venezuelana. Entretanto, sua produção é altamente afetada pela ocorrência da requeima (Phytophtora infestans), já que as condições climáticas são normalmente favoráveis para essa doença. O objetivo deste estudo foi determinar as datas de semeadura com os menores riscos climáticos para a ocorrência da requeima na região andina da Venezuela, considerando o uso de um modelo agrometeorológico de previsão da doença e um sistema de informação geográfica (GIS). O modelo de estimativa da doença utilizado foi o desenvolvido por Hyre (1954), o qual requer dados diários de chuva e temperatura. Esses dados foram obtidos de 106 estações meteorológicas, situadas nos estados de Mérida, Táchira e Trujillo, para períodos de 31 anos. O modelo de Hyre foi aplicado para todas as estações, obtendo-se as seguintes variáveis: número de dias favoráveis à doença (DFD); número de períodos com dez dias favoráveis consecutivos, denominado de ocorrência (O); e número de pulverizações requeridas para o controle da doença (S). Essas variáveis foram utilizadas para calcular o Índice de Máximo Risco (MRI) e o Índice de Risco Provável (PRI). A interpolação desses índices foi usada para gerar mapas de risco climático para cada época de semeadura. Os mapas de MRI e PRI mostraram que os maiores riscos para a proliferação da requeima da batata ocorre na estação chuvosa, de maio a julho, decrescendo durante as estações seca e de transição. Entretanto, alta variabilidade do risco para a doença foi observada em todas as épocas de semeadura. Os mapas gerados pela combinação do modelo agrometeorológico de previsão da doença e GIS também mostraram que em boa parte das áreas produtoras de batata na região andina da Venezuela a redução do número de pulverizações pode ser possível, no entanto há necessidade de novas pesquisas para se comprovar isso

    Risco climático para a ocorrência de requeima da batata na região andina da Venezuela

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    Potato is an important crop for Venezuelan agriculture. However, its production is highly affected by late blight (Phytophtora infestans), since weather is commonly favorable for this disease. The aim of this study was to determine the sowing dates of low climatic risk for potato late blight in the Andes region of Venezuela, with an agrometeorological disease model and geographical information system (GIS) tools. The disease model used in this study was developed by Hyre (1954) which requires daily rainfall and temperature data which were obtained from 106 weather stations, located at the States of Mérida, Táchira, and Trujillo, for a period of 31 years. Hyre's model was applied for all stations obtainig the following variables: number of disease favorable days (DFD); number of periods with ten consecutive favorable days, named disease occurrence (O); and number of sprays required for disease control (S). These variables were used to calculate the Maximum Risk Index (MRI) and the Probable Risk Index (PRI). The interpolation of these indexes was used to generate maps of climatic risk for each sowing date. MRI and PRI maps showed that the highest climatic risk for potato late blight occurrence was during the rainy season, from May to July, decreasing during dry and mid seasons. However, high disease risk variability was observed for all seasons. The maps generated by coupling an agrometeorological disease model and GIS also show that in great part of potato areas of Andes region the number of sprays could be reduced, but more investigations about that must be carried out.A batata é uma importante cultura para a agricultura venezuelana. Entretanto, sua produção é altamente afetada pela ocorrência da requeima (Phytophtora infestans), já que as condições climáticas são normalmente favoráveis para essa doença. O objetivo deste estudo foi determinar as datas de semeadura com os menores riscos climáticos para a ocorrência da requeima na região andina da Venezuela, considerando o uso de um modelo agrometeorológico de previsão da doença e um sistema de informação geográfica (GIS). O modelo de estimativa da doença utilizado foi o desenvolvido por Hyre (1954), o qual requer dados diários de chuva e temperatura. Esses dados foram obtidos de 106 estações meteorológicas, situadas nos estados de Mérida, Táchira e Trujillo, para períodos de 31 anos. O modelo de Hyre foi aplicado para todas as estações, obtendo-se as seguintes variáveis: número de dias favoráveis à doença (DFD); número de períodos com dez dias favoráveis consecutivos, denominado de ocorrência (O); e número de pulverizações requeridas para o controle da doença (S). Essas variáveis foram utilizadas para calcular o Índice de Máximo Risco (MRI) e o Índice de Risco Provável (PRI). A interpolação desses índices foi usada para gerar mapas de risco climático para cada época de semeadura. Os mapas de MRI e PRI mostraram que os maiores riscos para a proliferação da requeima da batata ocorre na estação chuvosa, de maio a julho, decrescendo durante as estações seca e de transição. Entretanto, alta variabilidade do risco para a doença foi observada em todas as épocas de semeadura. Os mapas gerados pela combinação do modelo agrometeorológico de previsão da doença e GIS também mostraram que em boa parte das áreas produtoras de batata na região andina da Venezuela a redução do número de pulverizações pode ser possível, no entanto há necessidade de novas pesquisas para se comprovar isso

    Eficiencia uso de agua aplicada por viticultores de Chile Central

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    62 p.Este estudio tiene como objetivo analizar la eficiencia del agua y como está afectada por los distintos sistemas de riego y realidades en que se ven involucrados los vitivinicultores de la zona centro del país. Los datos se recopilaron en una encuesta aplicada a 452 agricultores dedicados al rubro vitivinícola. Está enmarcada en el proyecto Fondecyt Nº 1140615. Los agricultores se separaron de aquellos que riegan por goteo y los que riegan por surco. Con los datos de interés adquiridos se estimó una función de producción. La variable dependiente considerada fue el logaritmo natural del Valor de Producción, y como las variables independientes se utilizaron de igual forma en logaritmo natural de tierra, labores, insumos y agua de riego volumétrica. Para el análisis de los datos se utilizó el programa estadístico SPSS (Statistical Package for the Social Sciences). Los resultados del modelo estadístico indican que los productores viñateros le asignan un valor económico al agua de riego en un rango de 32,pesoshastaunmaˊximode32, pesos hasta un máximo de 145.433 En términos generales se observó un sobre uso del recurso hídrico./ ABSTRACT:The air of this thesis is to analyze the water efficiency and how it is affected by the different irrigation systems of vineyards produce ons that in the central Chile. The data was collected though a survey taken to 452 vineyards farmers. The survey is within to project Fondecyt Nº 1140615. The farmers were segmented in two groups; the former use drip irrigation and the seconds use furrow irrigation. A Production Function was performed, The dependent variable considers was the natural logarithm of the production value, the independent variables included were land, labor, purchased inputs and volumetric irrigation water. SPSS (Statistical Package for the Social Sciences) was used to analyze de data. The results of the statistical model indicate that vineyard producers assign an economic value to irrigation water in the range of 32.66Chileanpesosuptoamaximumof 32.66 Chilean pesos up to a maximum of 145,433 Chilean pesos. In the general terms overuse of the water resource is observed a the sample

    Efecto de la inhibición de la radiación solar sobre la pigmentación, compuestos fenólicos y capacidad antioxidante en frutos de manzano CVS Cripps Pink y Rosy Glow

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    32 p.Durante la temporada 2018/2019, se evaluó, mediante el uso de embolsado, los efectos de la inhibición de radiación solar sobre la pigmentación, compuestos fenólicos y capacidad antioxidante en frutos de manzano cvs. Cripps Pink y Rosy Glow. Las mediciones se realizaron a cosecha y se implementaron 3 tratamientos: T1: embolsado 36 días antes de cosecha; T2: embolsado 24 días antes de cosecha; y T0: frutos en condición normal. Los resultados mostraron que la coloración de la piel de las manzanas se redujo significativamente producto del embolsado, al igual que la acumulación de compuestos fenólicos. Sin embargo, la inhibición de la radiación solar previa a cosecha afectó la coloración del cv. Cripps Pink, pero no la del cv. Rosy Glow. La concentración de fenoles totales fue mayor en frutos del cv. Rosy Glow creciendo bajo condiciones normales; en el caso de cv. Cripps Pink no hubo diferencias entre los tratamientos. La capacidad antioxidante fue mayor en aquellos frutos que se desarrollaron en condición normal y con embolsado 24 días antes de cosecha, para ambos cultivares. Los parámetros de madurez mostraron que los sólidos solubles no se vieron afectados por los distintos tratamientos a los que se sometió la fruta; sin embargo, con respecto a la firmeza si se obtuvieron diferencias, siendo la fruta embolsada 36 y 24 días antes de cosecha la que presentó los mayores valores con respecto a los frutos en condición normal

    An Energy-Water Corridor Along the US/Mexico Border: Changing the \u27Conversation\u27

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    Over the last decade, migration has become a divisive issue around the world. A large number of countries have erected barriers along their borders to prevent migration, leading to geopolitical tension. Climate change effects will likely exacerbate migration tensions, which will require bold and creative solutions to this difficult social predicament. Here we detail a plan to construct an energy-water corridor along a border that has been the focus of much attention recently: The U.S.-Mexico border. Our proposed solution helps to alleviate some of the negative effects of climate change, while providing energy and economic stimulus to an area that begs for sustainable development. The energy-water corridor will take advantage of the unique renewable energy resources along the border states and will use state-of-the-art water desalination and treatment systems to provide the resources for economic development in the region

    Giant tortoise genomes provide insights into longevity and age-related disease

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    © 2018, The Author(s), under exclusive licence to Springer Nature Limited. Giant tortoises are among the longest-lived vertebrate animals and, as such, provide an excellent model to study traits like longevity and age-related diseases. However, genomic and molecular evolutionary information on giant tortoises is scarce. Here, we describe a global analysis of the genomes of Lonesome George—the iconic last member of Chelonoidis abingdonii—and the Aldabra giant tortoise (Aldabrachelys gigantea). Comparison of these genomes with those of related species, using both unsupervised and supervised analyses, led us to detect lineage-specific variants affecting DNA repair genes, inflammatory mediators and genes related to cancer development. Our study also hints at specific evolutionary strategies linked to increased lifespan, and expands our understanding of the genomic determinants of ageing. These new genome sequences also provide important resources to help the efforts for restoration of giant tortoise populations

    Identification of Genetically Important Individuals of the Rediscovered Floreana Galápagos Giant Tortoise (Chelonoidis elephantopus) Provide Founders for Species Restoration Program

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    Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.Species are being lost at an unprecedented rate due to human-driven environmental changes. The cases in which species declared extinct can be revived are rare. However, here we report that a remote volcano in the Galápagos Islands hosts many giant tortoises with high ancestry from a species previously declared as extinct: Chelonoidis elephantopus or the Floreana tortoise. Of 150 individuals with distinctive morphology sampled from the volcano, genetic analyses revealed that 65 had C. elephantopus ancestry and thirty-two were translocated from the volcano’s slopes to a captive breeding center. A genetically informed captive breeding program now being initiated will, over the next decades, return C. elephantopus tortoises to Floreana Island to serve as engineers of the island’s ecosystems. Ironically, it was the haphazard translocations by mariners killing tortoises for food centuries ago that created the unique opportunity to revive this “lost” species today. CORRECTION PUBLISHED 13 SEPT 2017: The original version of this Article contained an error in the title of the paper, where the word “Provides” was incorrectly given as “Provide”. This has now been corrected in the PDF and HTML versions of the Article and in the accompanying Supplementary Information file. The attached full-text article has been updated to incorporate this change

    Homogenization via formal multiscale asymptotics and volume averaging: How do the two techniques compare?

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    A wide variety of techniques have been developed to homogenize transport equations in multiscale and multiphase systems. This has yielded a rich and diverse field, but has also resulted in the emergence of isolated scientific communities and disconnected bodies of literature. Here, our goal is to bridge the gap between formal multiscale asymptotics and the volume averaging theory. We illustrate the methodologies via a simple example application describing a parabolic transport problem and, in so doing, compare their respective advantages/disadvantages from a practical point of view. This paper is also intended as a pedagogical guide and may be viewed as a tutorial for graduate students as we provide historical context, detail subtle points with great care, and reference many fundamental works
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