Now showing items 9862-9881 of 72434

  • Beam focalization in reflection from flat dielectric subwavelength gratings 

    Cheng, Yu Chieh; Zeng, H; Trullàs Simó, Joaquim; Cojocaru, Crina; Malinauskas, Mangirdas; Jukna, T; Wiersma, D.S.; Staliunas, Kestutis (2014-10-15)
    Article
    Restricted access - publisher's policy
    We experimentally demonstrate the recently predicted effect of near-field focusing for light beams from flat dielectric subwavelength gratings (SWGs). This SWGs were designed for visible light 532 nm and fabricated by ...
  • Beam focusing in chirped mirror with a defect 

    Cheng, Yu Chieh; Staliunas, Kestutis (IEEE Press ; Wiley, 2004)
    Conference report
    Restricted access - publisher's policy
    Recently the beam focusing in reflection from chirped dielectric mirror has been proposed and demonstrated, where the negative (anomalous) diffraction is responsible for this flat mirror focusing. For a strong focusing ...
  • Beam focusing in reflections from flat subwavelength diffraction gratings 

    Cheng, Yu Chieh; Redondo, Javier; Staliunas, Kestutis (2014-03-10)
    Article
    Open Access
    We predict that narrow beams, reflecting from flat subwavelength diffraction gratings, can focus. The effect is shown for the beams of electromagnetic radiation; however, it should be observable for beams of waves of ...
  • Beam shaping in spatially modulated broad-area semiconductor amplifiers 

    Herrero Simon, Ramon; Botey Cumella, Muriel; Radziunas, Mindaugas; Staliunas, Kestutis (2012-12-15)
    Article
    Open Access
    We propose and analyze a beam-shaping mechanism that in broad-area semiconductor amplifiers occurs due to spatial pump modulation on a micrometer scale. The study, performed under realistic parameters and conditions, ...
  • Beam steering accuracy in holographic optical tweezers 

    Català i Castro, Frederic (Universitat Politècnica de Catalunya, 2013-09-10)
    Master thesis
    Open Access
    [ANGLÈS] The use of spatial light modulators (SLMs) to achieve dynamic control of optical tweezers is observed to provide subnanometer precision in single trap positioning. However, some features concerning the digitalized ...
  • Beam-ACO based on stochastic sampling: a case study on the TSP with time windows 

    López Ibáñez, Manuel; Blum, Christian (2009)
    Article
    Restricted access - publisher's policy
    Beam-ACO algorithms are hybrid methods that combine the metaheuristic ant colony optimization with beam search. They heavily rely on accurate and computationally inexpensive bounding information for choosing between different ...
  • Beam-ACO for the longest common subsequence problem 

    Blum, Christian (IEEE Computer Society Publications, 2010)
    Conference report
    Open Access
    The longest common subsequence problem is classical string problem. It has applications, for example, in pattern recognition and bioinformatics. In this work we present a socalled Beam-ACO approach for solving this problem. ...
  • Beam-ACO for the repetition-free longest common subsequence problem 

    Blum, Christian; Blesa Aguilera, Maria Josep; Calvo, Borja (2013)
    Conference report
    Restricted access - publisher's policy
    In this paper we propose a Beam-ACO approach for a combinatorial optimization problem known as the repetition-free longest common subsequence problem. Given two input sequences x and y over a finite alphabet S, this problem ...
  • Beamforming antennas for 60 GHz positioning systems 

    Toda, Annapapió; Romeu Robert, Jordi; Jofre Roca, Lluís; de Flaviis, Franco (Institute of Electrical and Electronics Engineers (IEEE), 2014)
    Conference report
    Restricted access - publisher's policy
    In this paper we analyze the benefit of using phased arrays as the receiving antennas of indoor location systems. A 60 GHz code division multiple access carrier-based ultra-wide band positioning system for the simultaneous ...
  • Beamforming Coordination Techniques in OFDM Multi-hop Cellular Networks 

    Torrellas Socastro, Marc (Universitat Politècnica de Catalunya, 2011-07-28)
    Master thesis (pre-Bologna period)
    Open Access
    English: Design and evaluate multi-hop cellular networks assuming coordination among multiantenna base stations and relay stations using linear precoders .
  • Beamforming design and power control for spectrum sharing systems 

    Vázquez Oliver, Miguel Ángel (Universitat Politècnica de Catalunya, 2014-01-24)
    Doctoral thesis
    Open Access
  • Beamforming Techniques for Environmental Noise 

    Tiana Roig, Elisabet (Universitat Politècnica de Catalunya, 2009-10-08)
    Master thesis (pre-Bologna period)
    Open Access
    A problem of practical interest when dealing with outdoor acoustic measurements is to estimate the noise contributions from di erent directions around the measurement point. This estimation can be done by means of ...
  • Beard House, Alta Dena, California. 

    Neutra, Richard (Escola Tècnica Superior d’Arquitectura de Barcelona. Departament de Projectes Arquitectònics., 1994)
    Article
    Open Access
  • Bearing fault detection by a novel condition-monitoring scheme based on statistical-time features and neural networks 

    Delgado Prieto, Miquel; Cirrincione, Giansalvo; García Espinosa, Antonio; Ortega Redondo, Juan Antonio; Henao, Humberto (Institute of Electrical and Electronics Engineers (IEEE), 2013-08)
    Article
    Restricted access - publisher's policy
    Bearing degradation is the most common source of faults in electrical machines. In this context, this work presents a novel monitoring scheme applied to diagnose bearing faults. Apart from detecting local defects, i.e., ...
  • Bearing fault diagnosis by EXIN CCA 

    Cirrincione,, Giansalvo; Henao, Humberto; Delgado Prieto, Miquel; Ortega Redondo, Juan Antonio (IEEE Computer Society Publications, 2012)
    Conference report
    Open Access
    EXIN CCA is an extension of the Curvilinear Component Analysis (CCA), which solves for the noninvariant CCA projection and allows representing data drawn under different operating conditions. It can be applied to data ...
  • Bearing-only slam methods 

    Munguía Alcalá, Rodrigo Francisco (Universitat Politècnica de Catalunya, 2009-10-19)
    Doctoral thesis
    Open Access
  • Bearings fault detection using inference tools 

    Delgado Prieto, Miquel; Cusido Roura, Jordi; Romeral Martínez, José Luis (In-Tech, 2011-09)
    Part of book or chapter of book
    Open Access
    The most used electric machine in the industry is the Induction Motor (IM), due to its simplicity and reduced cost. The analysis of the origin of IMs failures exhibits that the bearings are the major source of fault, and ...
  • Beaubourg Urbano 

    Peñín, Alberto (Laboratori d'Urbanisme de Barcelona, 2010-10)
    Article
    Open Access
  • Beaubourg urbano 

    Peñín Llobell, Alberto (2010)
    Article
    Open Access
  • Bedload transport of sand-gravel mixtures with antidunes: flume experiments 

    Núñez González, Francisco (Universitat Politècnica de Catalunya, 2012-07-20)
    Doctoral thesis
    Open Access