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Mostrando ítems 41-60 de 750

    • openAccess   Ultrashort pulse fiber delivery with optimized dispersion control by reflection grisms at 800 nm 

      Kalashyan, Meri; Lefort, Claire; Martínez-León, Lluís; Mansuryan, Tigran; Mouradian, Levon; Louradour, Frederic Optical Society of America (2012)
      We experimentally demonstrate a compact and efficient arrangement for fiber delivery of sub-30 fs energetic light pulses at 800 nm. Pulses coming from a broadband Ti:Sapphire oscillator are negatively pre-chirped by a ...

    • openAccess   Interoperable Search Mechanisms for Web 2.0 Resources 

      Díaz Sánchez, Laura; Núñez Redó, Manuela; González, David; Gil, José; Aragó Galindo, Pau; Pultar, Edward; Huerta, Joaquin European Commission (2012)
      We are currently witnessing ordinary citizens willing to share geospatial information using friendly and easy-to use tools provided by Web 2.0 platforms. These platforms act as social networks describing events with ...

    • openAccess   Surrounding neighborhood-based SMOTE for learning from imbalanced data sets 

      García, Vicente; Sánchez Garreta, Josep Salvador; Martín Félez, Raúl; Mollineda, Ramón A. Springer (2012)
      Many traditional approaches to pattern classifi- cation assume that the problem classes share similar prior probabilities. However, in many real-life applications, this assumption is grossly violated. Often, the ratios ...

    • openAccess   Volume growth, number of ends and the topology of complete submanifolds 

      Gimeno, Vicent; Palmer Andreu, Vicente arXIV (2012)
      Given a complete isometric immersion $\phi: P^m \longrightarrow N^n$ in an ambient Riemannian manifold $N^n$ with a pole and with radial sectional curvatures bounded from above by the corresponding radial sectional curvatures ...

    • closedAccess   On the use of data filtering techniques for credit risk prediction with instance-based models 

      García, Vicente; Sánchez Garreta, Josep Salvador; Marqués Marzal, Ana Isabel Elsevier (2012)
      Many techniques have been proposed for credit risk prediction, from statistical models to artificial intelligence methods. However, very few research efforts have been devoted to deal with the presence of noise and outliers ...

    • closedAccess   Self-similar behavior in semiconductor superlattices 

      Castro-Palacio, Juan Carlos; Villatoro, Francisco R.; Mendoza-Yero, Omel; Velázquez Abad, Luisberis; Monsoriu, Juan A. World Scientific Publishing Company (2012)
      The scattering of particles in fractal superlattices has been analyzed by means of the transfer matrix method. The fractal superlattice consists of alternating layers of semiconductor materials following the rule of a ...

    • openAccess   Multispectral integral imaging acquisition and processing using a monochrome camera and a liquid crystal tunable filter 

      Latorre Carmona, Pedro; Sánchez Ortiga, Emilio; Xiao, Xiao; Pla, Filiberto; Martínez Corral, Manuel; Navarro, Héctor; Saavedra, Genaro; Javidi, Bahram Optical Society of America (2012)
      This paper presents an acquisition system and a procedure to capture 3D scenes in different spectral bands. The acquisition system is formed by a monochrome camera, and a Liquid Crystal Tunable Filter (LCTF) that allows ...

    • openAccess   Filter-Type Variable Selection Based on Information Measures for Regression Tasks 

      Latorre Carmona, Pedro; Martínez Sotoca, José; Pla, Filiberto MDPI AG (2012)
      This paper presents a supervised variable selection method applied to regression problems. This method selects the variables applying a hierarchical clustering strategy based on information measures. The proposed technique ...

    • openAccess   Single-pixel digital ghost holography 

      Clemente Pesudo, Pedro Javier; Tajahuerce, Enrique; Torres Company, Víctor; Lancis, Jesús; Durán, Vicente American Physical Society (2012)
      Since its discovery, the “ghost” diffraction phenomenon has emerged as an unconventional technique for optical imaging with very promising advantages. However, extracting the intensity and phase information of a structured ...

    • openAccess   Single-pixel polarimetric imaging 

      Durán, Vicente; Clemente Pesudo, Pedro Javier; Fernández Alonso, Mercedes; Tajahuerce, Enrique; Lancis, Jesús Optical Society of America (2012)
      We present an optical system that performs Stokes polarimetric imaging with a single-pixel detector. This fact is possible by applying the theory of compressive sampling to the data acquired by a commercial polarimeter ...

    • closedAccess   Hyperspectral remote sensing of foliar nitrogen content 

      Knyazikhin, Yuri; Schull, Mitchell A.; Stenberg, Pauline; Mõttus, Matti; Rautiainen, Miina; Yang, Yan; Marshak, Alexander; Latorre Carmona, Pedro; Kaufmann, Robert K.; Lewis, Philip; Disney, Mathias I.; Vanderbilt, Vern; Davis, Anthony B.; Baret, Frédéric; Jacquemoud, Stéphane; Lyapustin, Alexei; Myneni, Ranga B. National Academy of Sciences (2012)
      A strong positive correlation between vegetation canopy bidirectional reflectance factor (BRF) in the near infrared (NIR) spectral region and foliar mass-based nitrogen concentration (%N) has been reported in some temperate ...

    • openAccess   Programmable quasi-direct space-to-time pulse shaper with active wavefront correction 

      Mendoza-Yero, Omel; Loriot, Vincent; Pérez Vizcaíno, Jorge; Mínguez-Vega, Gladys; Lancis, Jesús; De Nalda, Rebeca; Bañares, Luis Optical Society of America (2012)
      We experimentally demonstrate an extremely compact and programmable pulse shaper composed of a single phase mask encoded into a spatial light modulator. Its principle of operation is similar to the previously theoretically ...

    • openAccess   Open Source Based Deployment of Environmental Data into Geospatial Information Infrastructures 

      Gil, José; Díaz Sánchez, Laura; Granell, Carlos; Huerta, Joaquin IGI Global (2012)
      Today, scientists use local and closed geospatial solutions to run their models and store their results. This may limit their ability to share their models, and results with other interested colleagues. This scenario ...

    • closedAccess   Two-level classifier ensembles for credit risk assessment 

      Marqués Marzal, Ana Isabel; García, Vicente; Sánchez Garreta, Josep Salvador Elsevier (2012)
      Many techniques have been proposed for credit risk assessment, from statistical models to artificial intelligence methods. During the last few years, different approaches to classifier ensembles have successfully been ...

    • openAccess   Multibeam second-harmonic generation by spatiotemporal shaping of femtosecond pulses 

      Martinez Cuenca, Raul; Mendoza-Yero, Omel; Alonso, Benjamín; Sola, Íñigo Juan; Mínguez-Vega, Gladys; Lancis, Jesús Optical Society of America (2012)

    • closedAccess   Spatial threshold exceedance analysis through marked point processes 

      Mateu, Jorge; Madrid, Alfonso E.; Angulo, J.M. Wiley- Blackwell (2012)
      Indicators of recurrence, persistence and, in general, distribution patterns of extremal events defined by random field threshold exceedances provide relevant information on critical phenomena for risk assessment. Such ...

    • openAccess   Free-Motion Beam Propagation Factor Measurement by Means of a Liquid Crystal Spatial Light Modulator 

      Pérez Vizcaíno, Jorge; Mendoza-Yero, Omel; Martinez Cuenca, Raul; Martínez-León, Lluís; Tajahuerce, Enrique; Lancis, Jesús Institute of Electrical and Electronics Engineers (2012)
      In contrast to the mechanical scanning procedure described in the standard ISO/DIS 11146, the use of electronically tunable focal length lenses has proved its capability for the measurement of the laser beam propagation ...

    • openAccess   Experimental Demonstration of the Quasi-Direct Space-to-Time Pulse Shaping Principle 

      Loriot, Vincent; Mendoza-Yero, Omel; Mínguez-Vega, Gladys; Bañares, Luis; De Nalda, Rebeca Institute of Electrical and Electronics Engineers (IEEE) (2012)
      A new strategy of pulse shaping based on the quasi-direct space-to-time (QDST) conversion principle has been recently proposed theoretically [Mínguez-Vega et al., Opt. Express 16, 16993 (2008)]. In this letter, the ...

    • openAccess   Measuring complexity in OGC web services XML schemas: pragmatic use and solutions 

      Tamayo Fong, Alain; Huerta, Joaquin; Granell, Carlos Taylor & Francis (2012)
      The use of standards in the geospatial domain, such as those defined by the Open Geospatial Consortium (OGC), for exchanging data has brought a great deal of interoperability upon which systems can be built in a reliable ...

    • openAccess   Evaluación del uso y necesidades de información geoespacial de los profesionales en prevención y extinción de incendios forestales 

      Aragó Galindo, Pau; Granell, Carlos; Huerta, Joaquin; Díaz Sánchez, Laura Geofocus (2012)
      La información geoespacial necesaria para la gestión de los incendios forestales es muy amplia y diversa. Cada profesional que interviene en un incendio forestal actúa en diferentes fases (prevención, extinción), contexto ...