7 resultados para Júlio Pomar

em Consorci de Serveis Universitaris de Catalunya (CSUC), Spain


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Al llarg dels estius de 2006 i 2007 s'estudiaren 44 platges de tot el litoral de l'illa de Menorca, classificades en tres tipologies: A (platges urbanes), B (platges semi-urbanes) i C (platges verges). En cadascuna s'aplicà un sistema de 15 indicadors per tal de veure el nivell de pressió ambiental a què estaven sotmeses, i així valorar el seu grau de qualitat. En aquest treball es presenten els resultats de dos dels indicadors: índex d'impacte visual d'infraestructures i qualitat de flora terrestre. Els resultats preliminars sobre la situació de les platges de Menorca a partir d'aquests dos indicadors mostren conclusions prou significatives. A tall d’exemple, únicament un 9% de les platges estudiades no presentaven cap impacte visual d'alguna infraestructura; però, d'altra banda, un 80% de les platges estudiades compten amb presència d’espècies psammòfiles indicadores de qualitat.

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Desenvolupament d'un sistema d'adquisició, filtrat, emmagatzetmament i gestió de dades provinents d'un sistema de control de subministrament d'aliment d'una explotació porcina. D'altra banda, l'eina informàtica incorporarà dos bases de dades (bruta i neta) les quals es podran consultar amb un VI específic, tant de manera local com remota amb l'ajuda del webserver de labview, també conté un VI específic de generació d'informes (via internet) que facilita la inspecció de dades. Tots els programes estan implementats en labview i connectats en xarxa.

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Se señala la presencia de caliche fósil en el Triásico inferior y el cual es interpretado como caliche inicialmente maduro producido en cortas exposiciones subáreas en condiciones semiáridas. Se deducen das tipos de ambientes de acuerdo con los dos modelos $e secuencias litolgicas en las que se encuentra el caliche: partes distale de glacis de acumulación y 'playas', y diques y charcas en una llanura aluvial meandriforme.

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Electronic canopy characterization is an important issue in tree crop management. Ultrasonic and optical sensors are the most used for this purpose. The objective of this work was to assess the performance of an ultrasonic sensor under laboratory and field conditions in order to provide reliable estimations of distance measurements to apple tree canopies. To this purpose, a methodology has been designed to analyze sensor performance in relation to foliage ranging and to interferences with adjacent sensors when working simultaneously. Results show that the average error in distance measurement using the ultrasonic sensor in laboratory conditions is ±0.53 cm. However, the increase of variability in field conditions reduces the accuracy of this kind of sensors when estimating distances to canopies. The average error in such situations is ±5.11 cm. When analyzing interferences of adjacent sensors 30 cm apart, the average error is ±17.46 cm. When sensors are separated 60 cm, the average error is ±9.29 cm. The ultrasonic sensor tested has been proven to be suitable to estimate distances to the canopy in field conditions when sensors are 60 cm apart or more and could, therefore, be used in a system to estimate structural canopy parameters in precision horticulture.

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The high cost of feed ingredients, the use of non-renewable sources of phosphate and the dramatic increase in the environmental load resulting from the excessive land application of manure are major challenges for the livestock industry. Precision feeding is proposed as an essential approach to improve the utilization of dietary nitrogen, phosphorus and other nutrients and thus reduce feeding costs and nutrient excretion. Precision feeding requires accurate knowledge of the nutritional value of feedstuffs and animal nutrient requirements, the formulation of diets in accordance with environmental constraints, and the gradual adjustment of the dietary nutrient supply to match the requirements of the animals. After the nutritional potential of feed ingredients has been precisely determined and has been improved by the addition of enzymes (e.g. phytases) or feed treatments, the addition of environmental objectives to the traditional feed formulation algorithms can promote the sustainability of the swine industry by reducing nutrient excretion in swine operations with small increases in feeding costs. Increasing the number of feeding phases can also contribute to significant reductions in nutrient excretion and feeding costs. However, the use of precision feeding techniques in which pigs are fed individually with daily tailored diets can further improve the efficiency with which pigs utilize dietary nutrients. Precision feeding involves the use of feeding techniques that allow the provision of the right amount of feed with the right composition at the right time to each pig in the herd. Using this approach, it has been estimated that feeding costs can be reduced by more than 4.6%, and nitrogen and phosphorus excretion can both be reduced by more than 38%. Moreover, the integration of precision feeding techniques into large-group production systems can provide real-time off-farm monitoring of feed and animals for optimal slaughter and production strategies, thus improving the environmental sustainability of pork production, animal well-being and meat-product quality.

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Se describen someramente los principales arrecifes del Messiniense en España, haciendo hincapié en el conjunto de 'anomalias' presentan los arrecifes del Neógeno inferior en comparación con las asociaciones arrecifales actuales. Se discute la importancia y significado de Porites sp. como coral claramente dominante, y a menudo exclusivo, en la construcción de edificios arrecifales.