Now showing items 130-149 of 334

    • Expresiones para la determinación del factor de fricción en ríos de fuerte pendiente 

      López Alonso, Raúl; Barragán Fernández, Javier (Centro de Estudios y Experimentación de Obras Públicas, 2003)
      Con base en una selección de 145 datos pertenecientes a ríos de montaña de fuerte pendiente (³ 1%) se han desarrollado cinco expresiones para determinar el factor de fricción de Darcy-Weisbach. La primera expresión se ...
    • Extreme-value distributions and renormalization group 

      Calvo, Iván; Cuchí Oterino, J. C.; Esteve, J. G.; Falceto, Fernando (American Physical Society, 2012)
      In the classical theorems of extreme value theory the limits of suitably rescaled maxima of sequences of independent, identically distributed random variables are studied. The vast majority of the literature on the subject ...
    • Eye-safe lidar system for pesticide spray drift measurement 

      Gregorio López, Eduard; Rocadenbosch Burillo, Francesc; Sanz Cortiella, Ricardo; Rosell Polo, Joan Ramon (MDPI, 2015)
      Spray drift is one of the main sources of pesticide contamination. For this reason, an accurate understanding of this phenomenon is necessary in order to limit its effects. Nowadays, spray drift is usually studied by ...
    • Facilitation in plant communities: the past, the present, and the future 

      Brooker, Rob W.; Maestre, Fernando T.; Callaway, Ragan M.; Lortie, Christopher L.; Cavieres, Lohengrin A.; Kunstler, Georges; Liancourt, Pierre; Tielbörger, Katja; Travis, Justin M. J.; Anthelme, Fabien; Armas, Cristina; Coll Mir, Lluís; Corcket, Emmanuel; Delzon, Sylvain; Forey, Estelle; Kikvidze, Zaal; Olofsson, Johan; Pugnaire, Francisco I.; Quiroz, Constanza L.; Saccone, Patrick; Schiffers, Katja; Seifan, Merav; Touzard, Blaise; Michalet, Richard (John Wiley and Sons, 2007-09-06)
      1. Once neglected, the role of facilitative interactions in plant communities has received considerable attention in the last two decades, and is now widely recognized. It is timely to consider the progress made by research ...
    • Fine root seasonal dynamics, plasticity, and mycorrhization in 2 coexisting Mediterranean oaks with contrasting aboveground phenology 

      Coll Mir, Lluís; Camarero Martínez, Jesús Julio; Martínez de Aragón, Juan (Taylor & Francis, 2015-12-03)
      To advance understanding of the mechanisms underpinning the coexistence of Mediterranean oak species, we conducted a year-long analysis of the production, architecture, and mycorrhization status of the fine roots of a mixed ...
    • Flexible system of multiple RGB-D sensors for measuring and classifying fruits in agri-food Industry 

      Méndez Perez, Rodrigo; Auat Cheein, Fernando A.; Rosell Polo, Joan Ramon (Elsevier B.V., 2017-05-29)
      The productivity of the agri-food sector experiences continuous and growing challenges that make the use of innovative technologies to maintain and even improve their competitiveness a priority. In this context, this paper ...
    • Flow resistance equations for mountain rivers 

      López Alonso, Raúl; Barragán Fernández, Javier; Colomer, M. Àngels (Maria Àngels) (Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (Espanya), 2009)
      Three models of flow resistance (a Keulegan-type logarithmic law and two models developed for large-scale roughness conditions: the full logarithmic law and a model based on an inflectional velocity profile) were calibrated, ...
    • Flow resistance equations without explicit estimation of the resistance coefficient for coarse-grained rivers 

      López Alonso, Raúl; Barragán Fernández, Javier; Colomer, M. Àngels (Maria Àngels) (Elsevier, 2007)
      The uncertainty and subjectivity inherent in estimating the resistance coeffi-cient is one of the main sources of error in the application of flow resistance equations tonatural channels. Various studies have shown that ...
    • Forest management for adaptation to climate change in the Mediterranean basin: a synthesis of evidence 

      Vilà Cabrera, Albert; Coll Mir, Lluís; Martínez-Vilalta, Jordi; Retana, Javier (Elsevier, 2017-10-21)
      As global climate becomes warmer, the maintenance of the structure and function of Mediterranean forests constitutes a key challenge to forest managers. Despite the need for forest adaptation, an overall evaluation of the ...
    • Forest structure of Mediterranean yew (Taxus baccata L.) populations and neighbor effects on juvenile yew performance in the NE Iberian Peninsula 

      Casals, Pere; Camprodon, Jordi; Caritat, Antònia; Ríos, Ana I.; Guixé, David; Garcia-Martí, Xavier; Martín Alcón, Santiago; Coll Mir, Lluís (Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), 2015)
      Aim of study: In the Mediterranean region, yew (Taxus baccata L.) usually grows with other tree species in mixed forests. Yew recruitment and juvenile growth may depend on the structure of the forest and the net balance ...
    • Forest vegetation management under debate: an introduction 

      Ammer, Christian; Balandier, Philippe; Scott-Bentsen, N.; Coll Mir, Lluís; Löf, Magnus (Springer, 2011)
    • Fórmulas estadísticas de resistencia al flujo para hidráulica fluvial 

      López Alonso, Raúl (Colegio de Ingenieros Técnicos de Obras Públicas (Madrid), 2002)
      El empleo en hidráulica en lámina libre de las ecuaciones de resistencia al flujo de Gauckler-Manning o Darcy-Weisbach requiere la determinación de un coeficiente de resistencia; determinación que si bien es suficientemente ...
    • Fórmulas para el cálculo aproximado de la capacidad de transporte de sedimentos en ríos de montaña 

      López Alonso, Raúl (Colegio de Ingenieros Técnicos de Obras Públicas (Madrid), 2003)
      El cálculo de la capacidad de una corriente para el transporte de sedimentos de fondo requiere información sobre las características hidráulicas, geomorfológicas y granulométricas del cauce. Sin embargo, en ríos de fuerte ...
    • Fruit detection and 3D location using instance segmentation neural networks and structure-from-motion photogrammetry 

      Gené Mola, Jordi; Sanz Cortiella, Ricardo; Rosell Polo, Joan Ramon; Morros Rubió, Josep Ramon; Ruiz Hidalgo, Javier; Vilaplana Besler, Verónica; Gregorio López, Eduard (Elsevier, 2020-01-02)
      The development of remote fruit detection systems able to identify and 3D locate fruits provides opportunities to improve the efficiency of agriculture management. Most of the current fruit detection systems are based on ...
    • Fruit detection in an apple orchard using a mobile terrestrial laser scanner 

      Gené Mola, Jordi; Gregorio López, Eduard; Guevara, Javier; Auat Cheein, Fernando A.; Sanz Cortiella, Ricardo; Escolà i Agustí, Alexandre; Llorens Calveras, Jordi; Morros Rubió, Josep Ramon; Ruiz Hidalgo, Javier; Vilaplana Besler, Verónica; Rosell Polo, Joan Ramon (Academic Press. Published by Elsevier, 2019-09-21)
      The development of reliable fruit detection and localization systems provides an opportunity to improve the crop value and management by limiting fruit spoilage and optimised harvesting practices. Most proposed systems for ...
    • Fruit detection, yield prediction and canopy geometric characterization using LiDAR with forced air flow 

      Gené Mola, Jordi; Gregorio López, Eduard; Auat Cheein, Fernando A.; Guevara, Javier; Llorens Calveras, Jordi; Sanz Cortiella, Ricardo; Escolà i Agustí, Alexandre; Rosell Polo, Joan Ramon (Elsevier, 2019-11-29)
      Yield monitoring and geometric characterization of crops provide information about orchard variability and vigor, enabling the farmer to make faster and better decisions in tasks such as irrigation, fertilization, pruning, ...
    • Fuji-SfM dataset: A collection of annotated images and point clouds for Fuji apple detection and location using structure-from-motion photogrammetry 

      Gené Mola, Jordi; Sanz Cortiella, Ricardo; Rosell Polo, Joan Ramon; Morros Rubió, Josep Ramon; Ruiz Hidalgo, Javier; Vilaplana Besler, Verónica; Gregorio López, Eduard (Elsevier, 2020)
      The present dataset contains colour images acquired in a commercial Fuji apple orchard (Malus domestica Borkh. cv. Fuji) to reconstruct the 3D model of 11 trees by using structure-from-motion (SfM) photogrammetry. The data ...
    • Georeferenced Scanning System to Estimate the Leaf Wall Area in Tree Crops 

      Moral Martínez, Ignacio del; Rosell Polo, Joan Ramon; Arnó Satorra, Jaume; Escolà i Agustí, Alexandre; Sanz Cortiella, Ricardo; Masip Vilalta, Joan; Company Mesa, Joaquim (MDPI, 2015)
      This paper presents the use of a terrestrial light detection and ranging (LiDAR) system to scan the vegetation of tree crops to estimate the so-called pixelated leaf wall area (PLWA). Scanning rows laterally and considering ...
    • Gestión de datos y toma de decisiones: cuando la agricultura de precisión nos pone en aprietos 

      Arnó Satorra, Jaume; Martínez Casasnovas, José Antonio; Escolà i Agustí, Alexandre (New Ag International SARL, 2018-07-01)
      El uso de sensores en Agricultura de Precisión en conjunto con la tendencia de tener mejores resoluciones de muestreo espacial y temporal ha llevado a una enorme acumulación de datos. Y es un gran desafío poder gestionar ...
    • Gestión selvícola y regeneración natural ante un futuro incierto: marco teórico y principios generales 

      Coll Mir, Lluís (Sociedad Española de Ciencias Forestales, 2014)
      Desde hace algunas décadas los bosques ibéricos están sujetos a un importante proceso de cambio, moti-vado por un conjunto de razones de índole ambiental y socio-económico. Ante este contexto de creciente in-certidumbre ...