Now showing items 106-125 of 275

    • 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 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; Bielak, Kamil 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, P.; 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, 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, 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, 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, ...
    • 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 ...
    • Growth and yield of mixed versus pure stands of Scots pine (Pinus sylvestris L. ) and European beech (Fagus sylvatica L.) analysed along a productivity gradient through Europe 

      Pretzsch, Hans; del Río, Miren; Ammer, Christian; Avdagic, A.; Barbeito, I.; Bielak, Kamil; Brazaitis, G.; Coll Mir, Lluís; Dirnberger, G.; Drössler, L.; Fabrika, M.; Forrester, David I.; Godvod, K.; Heym, Michael; Hurt, V.; Kurylyak, V.; Löf, Magnus; Lombardi, F.; Matovic, B.; Mohren, Frits; Motta, R.; van Ouden, J.; Pach, Maciej; Ponette, Quentin; Schütze, G.; Schweig, J.; Skrzyszewski, J.; Srámek, V.; Sterba, Hubert; Stojanovic, Dejan; Svoboda, M.; Vanhellemont, M.; Verheyen, Kris; Wellhausen, K.; Zlatanov, Tzvetan; Bravo-Oviedo, A. (Springer, 2015)
      Mixing of complementary tree species may increase stand productivity, mitigate the effects of drought and other risks, and pave the way to forest production systems which may be more resource-use efficient and stable in ...
    • Hacia la mecanización integral de la recolección de aceituna 

      Planas de Martí, Santiago (Eumedia, 1995)
      La recoleción de la aceituna sigue siendo uno de los grandes problemas con que se enfrentan los productores. En grandes zonas de olivar de la D.O. Garrigues, a pesar de que se han introducido los vibradores multidireccionales, ...
    • Hacia un sistema armonizado de ajuste de la dosis en un tratamiento fitosanitario 

      Camp, Ferran; Solanelles Batlle, Francesc; Garcia, F.; Escolà i Agustí, Alexandre; Sanz Cortiella, Ricardo; Rosell Polo, Joan Ramon; Planas de Martí, Santiago (Eumedia, 2012)
      Tradicionalmente, las dosis indicadas en las etiquetas de los envases de los productos fitosanitarios se expresan en función de uno, o muy pocos, de los factores que intervienen en toda aplicación. El camino hacia la ...
    • Herbivory and seedling establishment in Pyrenean forests: Influence of micro- and meso-habitat factors on browsing pressure 

      Améztegui González, Aitor; Coll Mir, Lluís (Elsevier, 2015)
      Browsing damage is among the most determinant factors that limit the establishment of tree seedlings in forests. In some areas, this process leads to massive mortalities that can reduce or even completely prevent the ...
    • Host selection by the autoparasitoid Encarsia pergandiella on primary (Bemisia tabaci) and secondary (Eretmocerus mundus) hosts 

      Zhang, Yi-Bo; Castañé Fernández, Cristina; Gabarra i Ambert, Rosa; Albajes Garcia, Ramon; Wan, Fang-Hao (Wiley, 2015)
      In autoparasitoids, females are generally primary endoparasitoids of Hemiptera, while males are hyperparasitoids developing in or on conspecific females or other primary parasitoids. Female-host acceptance can be influenced ...
    • How to get and what to do with coloured maps 

      Arnó Satorra, Jaume; Martínez Casasnovas, José Antonio; Escolà i Agustí, Alexandre (New Ag International SARL, 2018-03-12)
      Since our first editorial, the Precision Ag Corner is following the cycle of Precision Agriculture (PA) described in the first issue. Until now, we have described how to obtain georeferenced data using visual observations ...
    • Human-caused fire occurrence modelling in perspective: a review 

      Costafreda Aumedes, Sergi; Comas Rodríguez, Carles; Vega García, Cristina (CSIRO Publishing, 2017)
      The increasing global concern about wildfires, mostly caused by people, has triggered the development of human-caused fire occurrence models in many countries. The premise is that better knowledge of the underlying factors ...