1,720,996 research outputs found
Armado de sistema de recuperación de agua gris domiciliario “Flujo subsuperficial”
No full textEn los últimos años ha sido de preocupación creciente la escasez de agua en diferentes partes del mundo. Si bien el 70% de la superficie de la tierra es agua, la mayor parte es agua salada y sólo el 3% es agua dulce. De esta última cifra, la mayoría se encuentra en glaciares, por lo que el agua dulce accesible representa solo el 1%. Centrándonos en el consumo poblacional y la falta de infraestructuras, hacen que el acceso al agua potable sea más difícil para personas de bajos recursos o alejadas de redes de distribución. Esto conlleva a problemas en la salud y disminución de calidad de vida.EEA MendozaFil: Angulo, Carlos Adrián. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Mendoza. Agencia de Extensión Rural Luján de Cuyo; Argentina.Fil: Junges, Melina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Ferrari, Florencia Noemí. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Mendoza; Argentina.Fil: Ferrari, Florencia Noemí. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin
Plantas palustres emergentes para humedales construidos de flujo subsuperficial
Full text linkLas plantas de los humedales poseen adaptaciones que les permiten sobrevivir a inundaciones periódicas o prolongadas. Se las denomina “palustres”, son plantas que crecen en el agua, en las orillas de los estanques o en zonas húmedas, y se caracterizan por tener sus raíces sumergidas en el agua y sus hojas y tallos pueden estar bajo el agua o en contacto con el aire.EEA MendozaFil: Ferrari, Florencia Noemí. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Mendoza; Argentina.Fil: Angulo, Carlos Adrián. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Mendoza. Agencia de Extensión Rural Luján de Cuyo; Argentina.Fil: Galera, M. Brunella. Universidad Nacional de Cuyo. Facultad de Ciencias Agrarias; Argentin
Riego en cultivos hortícolas. Guía de programación y planificación de riego por goteo en el Oasis Norte de Mendoza
No full textDentro del Oasis Norte provincial es importante mencionar, por su dinámica y diversidad de cultivos, al Cinturón Verde de Mendoza. El mismo está formado por las áreas irrigadas de los departamentos de Guaymallén y algunos distritos de Maipú (Rodeo del Medio, San Roque, Fray Luis Beltrán y parte de Coquimbito) y Lavalle (Las Violetas y La Pega). En este territorio se practica una agricultura intensiva de alto impacto ambiental que produce la mayoría de las hortalizas frescas consumidas en el mercado local y en otras provincias y países, según las oportunidades comerciales. La estructura productiva indica que el 70% de las explotaciones agropecuarias son menores a 5 ha, administradas especialmente bajo una tipología de agricultura familiar. El principal sistema de riego utilizado es gravitacional por superficie (99%) (INDEC, 2002). Sin embargo, cada vez una mayor cantidad de explotaciones cambian a sistemas de riego presurizados (Morábito, 2011). Es aquí en donde los paquetes tecnológicos adquiridos, en ocasiones con mal diseño agronómico y/o hidráulico, no sólo no permiten satisfacer las necesidades hídricas de los cultivos, sino que ocasionan un deterioro del suelo a través de la salinización de los mismos, con la consecuente disminución del rendimiento.
Este documento proporciona a productores y técnicos las herramientas básicas para la programación del riego por goteo de los principales cultivos hortícolas del Oasis Norte de Mendoza.EEA Mendoza, INTAFil: Ferrari, Florencia Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Mendoza; ArgentinaFil: Aguado, German Dario. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Mendoza; Argentin
Mantenimiento de equipos de riego por goteo
No full textParte del éxito en el funcionamiento de un equipo de riego por goteo consiste en tenerlo en condiciones
óptimas de operación en todo momento, lo que se consigue a través de una revisión e inspección
permanente. Cualquier interrupción del plan de riego puede tener efectos lamentables para las plantas al
producirse un déficit hídrico al romperse el bulbo húmedo.EEA MendozaFil: Ferrari, Florencia Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Mendoza. Agencia de Extensión Rural Luján de Cuyo; ArgentinaFil: Angulo, Carlos Adrián. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Mendoza. Agencia de Extensión Rural Luján de Cuyo; ArgentinaFil: Espíndola, Rodrigo Sebastián. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Mendoza. Agencia de Extensión Rural Luján de Cuyo; Argentin
Germination of six native perennial grasses that can be used as potential soil cover crops in drip-irrigated vineyards in semiarid environs of Argentina
Full text linkNative desert plants have structural adaptations that maximize photosynthesis rates and minimize water loss. They can be successfully utilized as soil cover crops in drip-irrigated vineyards where water availability is low. The objective of this paper is to study seed germination conditions and to recommend which best species is most apt as soil cover crop in drip-irrigated vineyards. Seed weight (the higher the seed weight, the greater the success of mechanical seeding) and germination tests (at 15, 20, 25, 30, and 35 °C in light and dark conditions) were carried out for six species native to Mendoza, Argentina. Germination percentage (GP) and mean time germination (MTG) were calculated. Digitaria californica (C4) had the highest GP (97% in light condition), which is recommended as a cover crop because of its seed germination potential. Pappophorum phillippianum (C4) had a 70% GP in light conditions (regardless of temperature) and a high seed weight. Leptochloa dubia (C4) and Sporobolus cryptandrus (C4) reached the highest GP at the highest temperature, although S. cryptandrus had the lowest seed weight. Nassella tenuis (C3) averaged 54% GP at 25 °C in light conditions. The GP of Setaria leucopila (C4) was not affected by temperature (26% in light, and 16% in darkness). Based on the GP results, S. leucopila was the worst choice of the six species. Hence, during seeding, soil temperature should be high (>20 °C) to ensure a rapid plant establishment of all species.Fil: Ferrari, Florencia Noemí. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Mendoza-San Juan. Estación Experimental Agropecuaria Mendoza; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza; ArgentinaFil: Parera, Carlos. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Mendoza-San Juan. Estación Experimental Agropecuaria Mendoza; Argentina. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Mendoza-San Juan; Argentin
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Whole plant open chamber to measure gas exchange on herbaceous plants
Full text linkMuch of our understanding about CO2 and H2O gas exchange in plants has been gained from studies at leaf level. Extrapolation of results to whole plant is difficult and not always accurate. In order to overcome this limitation, a chamber was designed to measure gas exchange at the whole plant level. The chamber developed in this work consisted on an acrylic cylinder 0.70 m high and 0.60 m wide. An incorporated blower was used to circulate air through the chamber and plant canopy from the bottom inlet upwards to the outlet tube providing a maximum flow of 0.072 m3 s-1. Air CO2 and water concentration were monitored with an infrared gas analyzer and temperature gradients were measured periodically with sensors. Air flow rates inside the chamber were 0.007, 0.012, 0.022, 0.047, and 0.072 m3 s-1. A comparative study showed that 0.022 or 0.047 m3 s-1 air flow rates did not modify substantially the natural environment within the chamber; measurements are close to real and exterior ones; temperature increased below 4 °C; photosynthetically active radiation (PAR) was reduced by 5%; and photosynthesis and evapotranspiration showed mean values with nonsignificant variations (22 ± 3.8 μmol CO2 m-2 s-1, and 15 ± 4.0 mmol H2O m-2 s-1, respectively). This chamber could be a useful tool to measure gas exchange of whole plants in herbaceous species under conditions of high evapotranspiration and for extended periods of time.Fil: Ferrari, Florencia Noemí. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Cuyo Mendoza - San Juan; ArgentinaFil: Parera, Carlos. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Cuyo Mendoza - San Juan; ArgentinaFil: Passera, Carlos Bernardo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Cuyo. Facultad de Ciencias Agrarias; Argentin
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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