Ara es mostren els items 38425-38444 de 84411

  • Freezing-thawing tests on natural pyroclastic samples 

    Pelaez, R.R; Casini, Francesca; Romero Morales, Enrique Edgar; Gens Solé, Antonio; Viggiani, Giulia M.B. (CRC Press, 2014)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    Artificial Ground Freezing is one of the construction techniques that were extensively adopted during construction of Line 1 of Napoli Underground, to ensure stability and waterproofing of the platform tunnels and inclined ...
  • Freight crossing the Pyrenées. Potential for short sea shipping 

    Martínez de Osés, Francesc Xavier (2005-10)
    Article
    Accés obert
    On the one hand, around 45% of European Union foreign trade is still carried by road and is consequently conditioned by traffic congestion or high fuel consumption, implying disadvantages related to pollution and safety, ...
  • Frenos al crecimiento del mercado ecológico: ¿el precio o la actitud hacia el medio ambiente? 

    Sánchez García, Mercedes; Gil Roig, José María; Gracia Royoz, Azucena (Pozuelo de Alarcón : Escuela Superior de Gestión Comercial y Marketing, 1998)
    Article
    Accés obert
  • 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 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 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 scheduling algorithms for 3G-LTE networks 

    Haro Escudero, Eva (Universitat Politècnica de Catalunya, 2009-07-24)
    Projecte Final de Màster Oficial
    Accés obert
  • 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 ...
  • Frequency-domain GLR detection of cyclostationary signals in frequency-selective channels 

    Font Segura, Josep; Riba Sagarra, Jaume; Villares Piera, Nemesio J.; Vázquez Grau, Gregorio (Institute of Electrical and Electronics Engineers (IEEE), 2014)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    The frequency diversity exhibited by cyclostationary signals is exploited in this paper. A novel rank-1 frequency-domain representation of a digital waveform is proposed to address the generalized likelihood ratio (GLR) ...
  • Frequency-hopping trellis-coded 8-DPSK for indoor communications 

    Agustí Comes, Ramon; Femenias Nadal, Guillem (Institute of Electrical and Electronics Engineers (IEEE), 1991)
    Text en actes de congrés
    Accés obert
    A TDMA (time-division multiple-access) slow frequency hopping-trellis-coded 8-DPSK (differential phase-shift keying) scheme is proposed for indoor mobile radio communications. In order to assess the performance of this ...
  • Frequency-Modulated Optical Feedback Interferometry for Nanometric Scale Vibrometry 

    Jha, Ajit; Azcona Guerrero, Francisco Javier; Royo Royo, Santiago (2016-02-18)
    Article
    Accés obert
    We demonstrate a novel method that makes an efficient use of laser nonlinear dynamics when subject to optical self-injection for subwavelength displacement sensing purposes. The proposed methodology combines two different ...