Ara es mostren els items 40044-40063 de 87806

  • Frequency and bandwidth control of switchable microstrip bandpass filters using RF-MEMS ohmic switches 

    Brito Brito, Zabdiel; Llamas, Ignacio; Pradell i Cara, Lluís; Giacomozzi, Flavio; Colpo, Sabrina (2013)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    In this paper a reconfigurable bandpass filter is designed using ohmic-contact cantilever-type Micro Electro Mechanical Systems (MEMS) switches., Tthe filter can switch between two different states with a center frequency ...
  • Frequency and damping identification in flutter flight testing using singular value decomposition and QR factorization 

    Barros, Jose; Flores Le Roux, Roberto Maurice; Lopez-Díez, Jesus; Martinez-Val, Rodrigo (2015-02)
    Article
    Accés obert
    A new method, based on singular value decomposition and QR factorization, has been developed and applied to the analysis of F-18 flutter flight test data. The method is capable of identifying the frequency and damping of ...
  • Frequency and radiation pattern reconfigurability of a multi-size pixel antenna 

    Rodrigo López, Daniel; Jofre Roca, Lluís (2012)
    Article
    Accés restringit per política de l'editorial
    Pixel reconfigurable apertures constitute one of the most adaptable structures regarding antenna reconfiguration, being capable to achieve frequency and pattern compound reconfiguration. However, pixel antennas require ...
  • Frequency and time filtering of filter-bank energies for HMM speech recognition 

    Nadeu Camprubí, Climent; Mariño Acebal, José Bernardo; Hernando Pericás, Francisco Javier; Nogueiras Rodríguez, Albino (H. TIMOTHY BRUMMELL, WILLIAM IDSARDI CITATION DELAWARE, NEW CASTLE, DELAWARE, 1996)
    Comunicació de congrés
    Accés restringit per política de l'editorial
    In speech recognition, a discriminative frequency weighting can be achieved by decorrelating the frequency sequence of log mel-scaled filter-bank energies with a computationally inexpensive filter. We show how the spectral ...
  • Frequency and voltage partitioning in presence of renewable energy resources for power system (example: North Chile power network) 

    Mehrjerdi, H.; Al-Emadi, N. A.; Rakhshani, Elyas; Rodríguez Cortés, Pedro (2016)
    Text en actes de congrés
    Accés obert
    This paper investigates techniques for frequency and voltage partitioning of power network based on the graph-theory. These methods divide the power system into distinguished regions to avoid the spread of disturbances and ...
  • Frequency averaging: a useful multiwindow spectral analysis approach 

    Nadeu Camprubí, Climent; Padrell, Jaume; Esquerra Llucià, Ignasi (IEEE IEEE, 1997)
    Text en actes de congrés
    Accés obert
    The multiwindow approach is a meaningful framework for nonparametric spectral estimation. It also encompasses several conventional methods as WOSA and frequency-averaged periodogram. Recently, some authors claimed that the ...
  • Frequency control of HVDC interconnected system considering derivative based inertia emulation 

    Rakhshani, Elyas; Mehrjerdi, Hasan; Remon, Daniel; Mir Cantarellas, Antonio; Rodríguez Cortés, Pedro (2016)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    This paper proposes an new approach for modeling and analysis the dynamic effects of virtual inertia on two-area AC/DC interconnected AGC power systems. Inertia emulation is known as key factor for modern power systems. ...
  • Frequency domain joint TOA and DOA estimation in IR-UWB 

    Navarro, M; Nájar Martón, Montserrat (2011-10)
    Article
    Accés restringit per política de l'editorial
    This paper addresses the problem of TOA and DOA estimation in IR-UWB systems. It considers a frequency domain approach for joint high resolution estimation of Time Of Arrival (TOA) and Direction Of Arrival (DOA). The ...
  • Frequency doubling in SBN crystal affected by poling and thermal treatment 

    Yao, Can (Universitat Politècnica de Catalunya, 2009-09-09)
    Projecte Final de Màster Oficial
    Accés obert
    The random anti-parallel micro-ferroelectric domains in SBN (Strontium-Barium Niobate, Sr0.61Ba0.39Nb2O3, ) crystal can be used for efficient nonlinear optical processes at different frequencies. The ferroelectric domains ...
  • Frequency doubling of femtosecond pulses in walk-off compensated npp 

    Pérez Torres, Juan; Carrasco Rodríguez, Sílvia; Torner Sabata, Lluís; Vanstryland, E W (2000-12)
    Article
    Accés obert
    Summary form only given. N-(4-nitrophenyl)-L-prolinol (NPP) is an organic molecular crystal developped by molecular engineering, that exhibits one of the highest phase-matchable second-order susceptibilities reported so ...
  • Frequency effects of pedestrian loads on footbridges 

    Marrè Badalló, Mireia (Universitat Politècnica de Catalunya / Denmarks Tekniske Universitet (Technical University of Denmark), 2009)
    Projecte/Treball Final de Carrera
    Accés restringit per decisió de l'autor
    Current Standards suggest for a footbridge dynamic analysis periodic load models which do not consider the imperfection nature of human walking. They not only do not represent pedestrian dynamic loads precisely but also ...
  • Frequency extrapolation in the integral equation mei 

    Rius Casals, Juan Manuel; Carpintero, C Pérez; Cardama Aznar, Ángel; Mosig, J R (Institution of Electrical Engineers, 1996-12)
    Article
    Accés obert
    An algorithm to extrapolate in frequency the matrix coefficients of the IE-MEI method is presented. This results in a total operation count to compute the induced current in electromagnetic scattering problems proportional ...
  • Frequency identification of Wiener systems with Backlash operators using separable least squares estimators 

    Giri, F.; Rochdi, Y.; Ikhouane, Fayçal; Brouri, A; Chaoui, F.Z (2012)
    Comunicació de congrés
    Accés obert
    This paper deals with the identification of Wiener models that involve backlash operators bordered by possibly noninvertible parametric lines. The latter are also allowed to cross each other making possible to account for ...
  • Frequency management in a campus-wide Wi-Fi deployment 

    Mengual Pérez, Ester (Universitat Politècnica de Catalunya, 2013-02-18)
    Projecte Final de Màster Oficial
    Accés obert
    Over the past years, Internet is spreading more and more. And not only in home devices, but also in other personal devices thus producing a collective mobile lifestyle. At the beginning of its rise, cable solution was the ...
  • Frequency planning optimisation in real mobile networks 

    Ruiz Boqué, Sílvia; Colet, X; Estevez, J (Institute of Electrical and Electronics Engineers (IEEE), 1999)
    Text en actes de congrés
    Accés obert
    Due to the annual increase of cellular subscribers, there is a growing interest by the network operators, in how to deploy the network infrastructure to achieve maximum capacity. A key point is the channel or frequency ...
  • Frequency scheduling algorithms for 3G-LTE networks 

    Haro Escudero, Eva (Universitat Politècnica de Catalunya, 2009-07-24)
    Projecte Final de Màster Oficial
    Accés obert
  • Frequency support markets with wind power participation 

    Ivanova, Anzhelika (Universitat Politècnica de Catalunya, 2016-07)
    Projecte Final de Màster UPC
    Accés obert
    The European Union (EU) aims to considerably reduce the emissions of harmful gases in the atmosphere, has resulted in drastic increase of power generation from renewable sources, especially wind. The nature of these sources ...
  • Frequency, radiation pattern and polarization reconfigurable antenna using a parasitic pixel layer 

    Rodrigo López, Daniel; Cetiner, Bedri Artug (2014-06-01)
    Article
    Accés restringit per política de l'editorial
    This communication presents a reconfigurable antenna capable of independently reconfiguring the operating frequency, radiation pattern and polarization. A switched grid of small metallic patches, known as pixel surface, ...
  • Frequency-adaptive virtual flux estimation for grid synchronization under unbalanced conditions 

    Suul, Jon Are; Luna Alloza, Álvaro; Rodríguez Cortés, Pedro; Undeland, Tore (2011)
    Text en actes de congrés
    Accés obert
    This paper proposes a new and explicitly frequencyadaptive method for Virtual Flux estimation and voltage sensorless grid synchronization under unbalanced conditions. The proposed system is based on using Second Order ...
  • Frequency-domain GLR detection of a second-order cyclostationary signal over fading channels 

    Riba Sagarra, Jaume; Font Segura, Josep; Villares Piera, Nemesio J.; Vázquez Grau, Gregorio (2014-04-01)
    Article
    Accés restringit per política de l'editorial
    Cyclostationary processes exhibit a form of frequency diversity. Based on that, we show that a digital waveform with symbol period T can be asymptotically represented as a rank-1 frequency-domain vector process which ...