Artículos, conferencias, monografías
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Esta colección está formada por artículos, conferencias, comunicaciones y otras publicaciones elaborados por miembros de la Universitat Politècnica de València.
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- PublicationSimplified WDM Optical Beamforming Network for Large Antenna Arrays(Institute of Electrical and Electronics Engineers, 2006-05-16) Vidal Rodriguez, Borja; Mengual Chulia, Teresa; Ibáñez-López, Cristina; Martí Sendra, Javier; McKenzie, Iain; Vez, Emilio; Santamaría, Javier; Dalmases, Francesc; Jofre, Lluis; Escuela Técnica Superior de Ingeniería de Telecomunicación; Dpto. de Comunicaciones; Instituto Universitario de Tecnología Nanofotónica; European Space Agency; SENER, INGENIERIA Y SISTEMAS, S.A.[EN] A novel approach to simplify optical beamforming networks based on wavelength-division-multiplexing (WDM) optical sources and a dispersive medium is proposed. The technique relies on the combination of dispersive and nondispersive time delays to allow the reuse of optical carriers. Thus, the number of required optical sources, which is one of the main limitations of WDM-based beamforming architectures, can be drastically reduced. The approach eases the implementation of these architectures in large antenna arrays, reducing the cost, size, and complexity of the beamformer. Preliminary experimental results are provided to validate the concept.
- PublicationRegulated Deficit Irrigation in 'Clementina de Nules' citrus trees. II. Vegetative effects.(Taylor & Francis, 2000) González Altozano, Pablo; Castel, J.R.; Escuela Técnica Superior de Ingeniería Agronómica y del Medio Natural; Dpto. de Ingeniería Rural y Agroalimentaria; EUREF; Instituto Nacional de Investigaciones Agrarias; Comisión Interministerial de Ciencia y Tecnología[EN] An experiment on Regulated Deficit Irrigation (RDI) was performed during 1995 and 1996 in an orchard planted with drip-irrigated `Clementina de Nules¿/Carrizo Citrange in Moncada (Valencia) Spain. Treatments consisted of a control, irrigated during the whole year at 125% ETlys and RDI treatments where irrigation was reduced to 25% or to 50% of crop evapotranspiration measured by a weighing lysimeter (ETlys) during one of the following periods: I) flowering and fruit set (spring); II) initial fruit enlargement phase (summer) and III) final fruit growth and maturation phases (end of summer-autumn). An additional treatment, denominated 50%-Year, was irrigated at 50% ETlys during the whole year. The effects of RDI treatments in relation to tree water status (pre-dawn ¿pd and midday ¿md leaf water potential, as well as their integral with time) show a good relation between total shoot emergence in the different growth flushes and the stress intensity reached (¿pd) (r2 = 0.80). This correlation was mainly due to the number of floral shoots (r2 = 0.86) and not to vegetative ones (r2 = 0.22). Similar results were observed between the stress integral at pre-dawn in each period and the former sprouting variables. In all cases, correlation was better with pre-dawn leaf water potential or with pre-dawn stress integral than with those at midday. RDI during spring reduced shoot length of the first growth flush (A1) and increased fruitlet fall after restarting normal irrigation. It also produced ¿off-season¿ flowering in the second flush growth (A2) and increased shoot emergence of the third flush growth (A3) with about 10% of them being floral. Summer RDI treatments did not alter vegetative growth, and although they produced off-season flowering (A3) it was much smaller than that of autumn RDI treatments, which in addition reduced vegetative growth with respect to the control. These effects, together with those of yield and fruit quality presented elsewhere, show that summer is the more appropriate period to apply RDI in ¿Clementina de Nules¿ mandarin trees.
- PublicationContext-Sensitive Dependency Pairs(Springer-Verlag, 2006) Alarcón, Beatriz; Gutiérrez Gil, Raúl; Lucas Alba, Salvador; Instituto Universitario Valenciano de Investigación en Inteligencia Artificial; Dpto. de Sistemas Informáticos y Computación; Escuela Politécnica Superior de Alcoy; Escuela Técnica Superior de Ingeniería Informática; European Commission; Generalitat Valenciana; European Regional Development Fund; Ministerio de Educación y Ciencia; Ministerio de Ciencia, Innovación y Universidades[EN] Termination is one of the most interesting problems when dealing with context-sensitive rewrite systems. Although there is a good number of techniques for proving termination of context-sensitive rewriting (CSR), the dependency pair approach, one of the most powerful techniques for proving termination of rewriting, has not been investigated in connection with proofs of termination of CSR. In this paper, we show how to use dependency pairs in proofs of termination of CSR. The implementation and practical use of the developed techniques yield a novel and powerful framework which improves the current state-of-the-art of methods for proving termination of CSR.
- PublicationSolving the Inverse Dynamic Control for Low Cost Real-Time Industrial Robot Control Applications(Cambridge University Press, 2003-06) Valera Fernández, Ángel; Mata Amela, Vicente; Vallés Miquel, Marina; Valero, F.; Rosillo, N.; Benimeli Andreu, Francesc Xavier; Dpto. de Ingeniería de Sistemas y Automática; Escuela Técnica Superior de Ingeniería Informática; Escuela Técnica Superior de Ingeniería del Diseño; Instituto Universitario de Investigación Concertado de Ingeniería Mecánica y Biomecánica; Escuela Técnica Superior de Ingeniería Industrial; Instituto Universitario de Automática e Informática Industrial; Dpto. de Ingeniería Mecánica y de Materiales[EN] This work deals with the real-time robot control implementation. In this paper, an algorithm for solving Inverse Dynamic Problem based on the Gibbs-Appell equations is proposed and verified. It is developed using mainly vectorial variables, and the equations are expressed in a recursive form, it has a computational complexity of O(n). This algorithm will be compared with one based on Newton-Euler equations of motion, formulated in a similar way, and using mainly vectors in their recursive formulation. This algorithm was implemented in an industrial PUMA robot. For the robot control a new and open architecture based on PC had been implemented. The architecture used has two main advantages. First it provides a total open control architecture, and second it is not expensive. Because the controller is based on PC, any control technique can be programmed and implemented, and in this way the PUMA can work on high level tasks, such as automatic trajectory generation, task planning, control by artificial vision, etc.
- PublicationConsequences of a severe drought on spatial paterns of woody plants in a two-phase mosaic steppe of Stipa tenacissima L.(Elsevier, 2002-11-14) García-Fayos, Patricio; Gasque Albalate, Maria Concepcion; Escuela Técnica Superior de Ingeniería Agronómica y del Medio Natural; Dpto. de Física Aplicada; Generalitat Valenciana; Consejo Superior de Investigaciones Científicas[EN] The establishment and development of the plants of S. tenacissima L. organize a source¿sink pattern of water and sediments from bare soil areas to tussocks on mountain slopes forming small terraces or terracettes upslope of tussocks. We hypothesized that terracettes enhance woody plant survival compared with woody plants on bare soil. We examined this hypothesis at three locations in south-eastern Spain after a severe drought from 1993 to 1995. The spatial association of individual plants and the pattern of plant mortality support the hypothesis that the terracettes formed by S. tenacissima tussocks facilitate woody plants. The prediction that facilitation dominates interference during stress periods such as drought was supported by mortality patterns. Drought effects alone do not explain spatial patterns of woody plants in the two-phase mosaic steppe of Stipa tenacissima.