Now showing items 74-93 of 331

    • Contrasting patterns of tree species mixture effects on wood δ13C along an environmental gradient 

      de Streel, G.; Collet, Catherine; Barbeito, I.; Bielak, Kamil; Bravo Oviedo, Andrés; Brazaitis, G.; Coll Mir, Lluís; Drössler, L.; Forrester, David I.; Heym, Michael; Löf, Magnus; Pach, Maciej; Pretzsch, Hans; Ruiz-Peinado, Ricardo; Skrzyszewski, J.; Stankevičiūtė, J.; Svoboda, M.; Verheyen, Kris; Zlatanov, Tzvetan; Bonal, Damien; Ponette, Quentin (Springer Nature, 2019-09-06)
      Establishing mixed-species stands is frequently proposed as a strategy to adapt forests to the increasing risk of water scarcity, yet contrasted results have been reported regarding mixing effects on tree drought exposure. ...
    • Corrección de cauces torrenciales 

      López Alonso, Raúl (Colegio de Ingenieros Técnicos de Obras Públicas (Madrid), 1997)
      Las cuencas torrenciales presentan una respuesta hidrológica caracterizada por avenidas súbitas y violentas, que transportan grandes cantidades de material sólido, pudiendo afectar gravemente a las infraestructuras de áreas ...
    • Cost reduction in pressurized irrigation networks under a rotation schedule 

      Monserrat Viscarri, Joaquín; Alduán, Andres (Springer Nature, 2020-07-10)
      Rotation scheduling implies a reduction in pipe flows and, consequently, in network cost. This kind of scheduling is considered rigid, but the recent development of new technologies, such as Supervisory Control And Data ...
    • Coupling a water balance model with forest inventory data to predict drought stress: the role of forest structural changes vs. climate changes 

      De Cáceres, Miquel; Martínez-Vilalta, Jordi; Coll Mir, Lluís; Llorens, Pilar; Casals, Pere; Poyatos, Rafael; Pausas, Juli G. (Juli Garcia); Brotons, Lluís (Elsevier, 2015-07-09)
      Mechanistic water balance models can be used to predict soil moisture dynamics and drought stress in individual forest stands. Predicting current and future levels of plant drought stress is important not only at the local ...
    • Cómo la inteligencia artificial nos ayuda a contar manzanas 

      Gené Mola, Jordi; Gregorio López, Eduard; Rosell Polo, Joan Ramon (The Conversation España, 2020-01-27)
    • Cómo obtener y qué hacer con los mapas de colores 

      Arnó Satorra, Jaume; Martínez Casasnovas, José Antonio; Escolà i Agustí, Alexandre (New Ag International SARL, 2018-05-01)
      Desde nuestro primer artículo, esta sección ha ido siguiendo el ciclo de la Agricultura de Precisión (AP). Hasta ahora, hemos descrito cómo obtener datos georreferenciados mediante observaciones visuales o a través de ...
    • Criterios para la selección del tractor frutero 

      Arnó i Pujol, Judit; Masip Vilalta, Joan (Eumedia, 1998)
      La selección del tractor más adecuado para una determinada explotación frutícola requiere considerar dos aspectos fundamentales. En primer lugar, el fruticultor debe valorar la conveniencia económica de la adquisición ...
    • Crown bulk density and fuel moisture dynamics in Pinus pinaster stands are neither modified by thinning nor captured by the Forest Fire Weather Index 

      Soler Martin, Marc; Bonet Lledos, José Antonio; Martínez de Aragón, Juan; Voltas Velasco, Jordi; Coll Mir, Lluís; Resco de Dios, Víctor (Springer Nature, 2017-06-28)
      Key message. No temporal change was recorded during summer in fuel availability in Pinus pinaster stands, contrary to predictions from the Forest Fire Weather Index. Also, thinning had no mid-term effect on fuel moisture ...
    • Data management and decision making: when Precision Agriculture puts us in trouble 

      Arnó Satorra, Jaume; Martínez Casasnovas, José Antonio; Escolà i Agustí, Alexandre (New Ag International SARL, 2018-06-01)
      The use of sensors in Precision Agriculture together with the trend of increasing spatial and temporal sampling resolutions, lead to the generation of huge amounts of data. The appropriate management of such data sets to ...
    • Deciduous tree reconstruction algorithm based on cylinder fitting from mobile terrestrial laser scanned point clouds 

      Méndez, Valeriano; Rosell Polo, Joan Ramon; Sanz Cortiella, Ricardo; Escolà i Agustí, Alexandre; Catalán, Heliodoro (Elsevier, 2014)
      Vector reconstruction of objects from an unstructured point cloud obtained with a LiDAR-based system (light detection and ranging) is one of the most promising methods to build three dimensional models of orchards. The ...
    • Deposición transversal de líquido de las boquillas de doble abanico TTJ60-11004 y TTJ60-11002 en distintas condiciones operacionales 

      Viana, R.G.; Ferreira, L.R.; Rosell Polo, Joan Ramon; Solanelles Batlle, Francesc; Machado, M.S.; Machado, A.F.L. (Sociedade Brasileira da Ciência das Plantas Daninhas, 2009)
      El objetivo de este trabajo fue el de evaluar la deposición transversal de caldo de las boquillas pulverizadoras de doble abanico TTJ60-11004 y TTJ60-11002 en distintas condiciones operacionales. Se utilizaron 5 muestras ...
    • Desarrollo de ecuaciones de flujo uniforme para ríos de grava 

      López Alonso, Raúl; Barragán Fernández, Javier (Centro de Estudios y Experimentación de Obras Públicas, 2004)
      Con base en un conjunto de 904 datos hidrométricos pertenecientes a ríos de grava (de alienación no sinuosa desprovistos de cubierta vegetal significativa en el cauce y carentes de obstáculos) se han desarrollado un conjunto ...
    • Desarrollo de ecuaciones de flujo uniforme para ríos de montaña 

      López Alonso, Raúl; Barragán Fernández, Javier (Colegios y Asociaciones de Ingenieros de Montes e Ingenieros Técnicos Forestales, 2004)
      Con base en una selección de 145 datos pertenecientes a ríos de montaña de fuerte pendiente (entre el 1 y 5%), de alineación no sinuosa, sin vegetación significativa en el cauce y sin transporte intenso de sedimentos, se ...
    • Design of a decision support method to determine volume rate for vineyard spraying 

      Gil Moya, Emilio; Escolà i Agustí, Alexandre (American Society of Agricultural and Biological Engineers, 2009)
      Dose determination in crops such as grapevine, which develops a large canopy within a relatively short period of time, becomes a key factor on the final success of plant protection product (PPP) application. Efficacy of ...
    • Design of paired laterals on uniformly sloping fields 

      Monserrat Viscarri, Joaquín; Barragán Fernández, Javier; Cots Rubió, Lluís (American Society of Civil Engineers (ASCE), 2018-03-30)
      Knowledge of the maximum length for paired drip laterals facilitates the economic optimization of micro-irrigation systems. The methodologies proposed to date have been based on complicated mathematical procedures that ...
    • Determination of spray drift and buffer zones in 3D crops using the ISO standard and new LiDAR methodologies 

      Torrent Martí, Xavier; Gregorio López, Eduard; Rosell Polo, Joan Ramon; Arnó Satorra, Jaume; Peris Giner, Miquel; van de Zande, Jan C.; Planas de Martí, Santiago (Elsevier, 2020-01-15)
      Spray drift generated in the application of plant protection products in tree crops (3D crops) is a major source of environmental contamination, with repercussions for human health and the environment. Spray drift contamination ...
    • Diaphragm valve hydraulic behavior depending on operating pressure 

      Monserrat Viscarri, Joaquín; Rubio, A.; Cots Rubió, Lluís (American Society of Civil Engineers (ASCE), 2019-08-19)
      In this study, a hydraulically operated and diaphragm-actuated type of diaphragm valve using an elastic diaphragm was tested. With this type of valve, the opening fraction depends on the pipeline pressure; thus, it is ...
    • Different factors for different causes: analysis of the spatial aggregations of fire ignitions in Catalonia (Spain) 

      González-Olabarria, José Ramón; Mola Yudego, Blas; Coll Mir, Lluís (John Wiley and Sons, 2015-03-03)
      The present study analyzes the effects of different socioeconomic factors on the frequency of fire ignition occurrence, according to different original causes. The data include a set of documented ignition points in the ...
    • Discriminating crop, weeds and soil surface with a terrestrial LIDAR sensor 

      Andújar, Dionisio; Rueda-Ayala, Victor; Moreno, Hugo; Rosell Polo, Joan Ramon; Escolà i Agustí, Alexandre; Valero, Constantino; Gerhards, Roland; Fernández-Quintanilla, César; Dorado, José; Griepentrog, Hans-Werner (Molecular Diversity Preservation International (MDPI), 2013)
      In this study, the evaluation of the accuracy and performance of a light detection and ranging (LIDAR) sensor for vegetation using distance and reflection measurements aiming to detect and discriminate maize plants and ...
    • Distribuição de líquido da ponta de pulverização com indução de ar e jato excêntrico AIUB 8502 sob diferentes condições 

      Viana, R.G.; Ferreira, L.R.; Rosell Polo, Joan Ramon; Solanelles Batlle, Francesc; Filat, A.; Machado, M.S.; Machado, A.F.L.; Silva, M.C.C. (Sociedade Brasileira da Ciência das Plantas Daninhas, 2010)
      Objetivou-se com este trabalho avaliar a distribuição de líquido da ponta de pulverização com indução de ar e jato excêntrico AIUB 8502 sob diferentes condições operacionais. Foram avaliados perfil individual, vazão, ângulo ...