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Mostrando ítems 217-236 de 751

    • openAccess   Development of spatial density maps based on geoprocessing web services: application to tuberculosis incidence in Barcelona, Spain 

      Dominkovics, Pau; Granell, Carlos; Perez-Navarro, Antoni; Casals, Martí; Orcau, Àngels; Caylà, Joan A. BioMed Central (2011-11-29)
      Background: Health professionals and authorities strive to cope with heterogeneous data, services, and statistical models to support decision making on public health. Sophisticated analysis and distributed processing ...

    • openAccess   Diffractive digital lensless holographic microscopy with fine spectral tuning 

      Mendoza-Yero, Omel; Tajahuerce, Enrique; Lancis, Jesús; García Sucerquia, Jorge Optical Society of America (2013)
      We experimentally demonstrate an all-diffractive optical setup for digital lensless holographic microscopy with easy wavelength line selection and micrometric resolution. In the proposed system, an ultrashort laser pulse ...

    • openAccess   Diffractive optics for quasi-direct space-to-time pulse shaping 

      Mínguez-Vega, Gladys; Mendoza-Yero, Omel; Lancis, Jesús; Gisbert, Rafael; Andrés, Pedro Optical Society of America (2008)
      The strong chromatic behavior associated with a conventional diffractive lens is fully exploited to propose a novel optical device for pulse shaping in the femtosecond regime. This device consists of two optical elements: ...

    • openAccess   Diffractive optics for spectral control of the supercontinuum generated in sapphire with femtosecond pulses 

      Romero, Carolina; Borrego Varillas, Rocío; Camino, Acner; Mínguez-Vega, Gladys; Mendoza-Yero, Omel; Hernández Toro, Juan; Vázquez de Aldana, Javier R. Optical Society of America (2011)
      We propose the use of kinoform diffractive lenses to focus near infrared femtosecond pulses in sapphire crystals for supercontinuum generation. It is shown that a strongly peaked structure appears in the blue region of the ...

    • openAccess   Dipolar localization of waves in twisted phononic crystal plates 

      Martí-Sabaté, Marc; Torrent, Daniel American Physical Society (2021-01-11)
      The localization of waves in two-dimensional clusters of scatterers arranged in relatively twisted lattices is studied by multiple scattering theory. It is found that, for a given frequency, it is always possible to nd ...

    • openAccess   Direct lightweight temporal compression for wearable sensor data 

      Klus, Lucie; Klus, Roman; Lohan, Elena Simona; Granell, Carlos; Talvitie, Jukka; Valkama, Mikko; Nurmi, Jari IEEE (2021-02-01)
      Emerging technologies enable massive deployment of wireless sensor networks across many industries. Internet of Things (IoT) devices are often deployed in critical infrastructure or health monitoring and require fast ...

    • openAccess   Direct retrieval method of the effective permittivity and permeability of bulk semi-infinite metamaterials by variable-angle spectroscopic ellipsometry 

      Flamant, Quentin; Torrent, Daniel; Gómez-Graña, Sergio; Grigorenko, Alexander N.; Kravets, Vasyl G.; Barois, Philippe; Ponsinet, Virginie; Baron, Alexandre OSA Publishing (2019)
      In this work, we present a simple method for the direct retrieval of the effective permittivity and permeability of a bulk semi-infinite metamaterial from variable-angle spectroscopic ellipsometry measurements. Starting ...

    • openAccess   Directional analysis for point patterns on linear networks 

      Moradi, Mehdi; Mateu, Jorge; Comas, Carles Wiley (2020)
      Statistical analysis of point processes often assumes that the underlying process is isotropic in the sense that its distribution is invariant under rotation. For point processes on R2 , some tests based on the K- and ...

    • openAccess   Discovering location based services: A unified approach for heterogeneous indoor localization systems 

      Furfari, Francesco; Crivello, Antonino; Baronti, Paolo; Barsocchi, Paolo; GIROLAMI, MICHELE; Palumbo, Filippo; Quezada Gaibor, Darwin; Mendoza-Silva, Germán Martín; Torres-Sospedra, Joaquín Elsevier B.V. (2021-03-01)
      The technological solutions and communication capabilities offered by the Internet of Things paradigm, in terms of raising availability of wearable devices, the ubiquitous internet connection, and the presence on the ...

    • closedAccess   Discovering places of interest in everyday life from smartphone data 

      Montoliu Colás, Raul; Blom, Jan; Gatica-Perez, Daniel Springer (2013)
      In this paper, a new framework to discover places-of-interest from multimodal mobile phone data is presented. Mobile phones have been used as sensors to obtain location information from users’ real lives. A place-of-interest ...

    • openAccess   Dispersion management in two-photon microscopy by using diffractive optical elements 

      Mendoza-Yero, Omel; Pérez Vizcaíno, Jorge; Mínguez-Vega, Gladys; Martinez Cuenca, Raul; Andrés, Pedro; Lancis, Jesús Optical Society of America (2013)
      We demonstrate efficient generation of wide-field fluorescence signals in two-photon microscopy exploiting diffractive optical elements and short pulses by using a dispersion-compensated beam delivery optics module. ...

    • openAccess   Dissimilarity-Based Linear Models for Corporate Bankruptcy Prediction 

      García, Vicente; Marqués Marzal, Ana Isabel; Sánchez Garreta, Josep Salvador; Ochoa Domínguez, Humberto de Jesús Springer (2019-03)
      Bankruptcy prediction has acquired great relevance for financial institutions due to the complexity of global economies and the growing number of corporate failures, especially since the world financial crisis of 2008. In ...

    • closedAccess   Distance-based beta regression for prediction of mutual funds 

      Melo, Oscar O.; Melo, Carlos E.; Mateu, Jorge Springer (2015-01)
      In the context of regression with a beta-type response variable, we propose a new method that links two methodologies: a distance-based model, and a beta regression with variable dispersion. The proposed model is useful ...

    • openAccess   Do Monetary Incentives Influence Users’ Behavior in Participatory Sensing? 

      Ngo, Manh Khoi; Casteleyn, Sven; Moradi, Mehdi; Pebesma, Edzer MDPI (2018)
      Participatory sensing combines the powerful sensing capabilities of current mobile devices with the mobility and intelligence of human beings, and as such has to potential to collect various types of information at a high ...

    • openAccess   Downstream Services for Rice Crop Monitoring in Europe: From Regional to Local Scale 

      Busetto, Lorenzo; Casteleyn, Sven; Granell, Carlos; Pepe, Monica; Barbieri, Massimo; Campos-Taberner, Manuel; CASA, Raffaele; Collivignarelli, Francesco; Confalonieri, Roberto; Crema, Alberto; García Haro, Francisco Javier; Luca Gatti; Gatti, Luca; Gitas, Ioannis; González-Pérez, Alberto; Grau Muedra, Gonçal Andreu; Guarneri, Tommaso; Holecz, Francesco; Katsantonis, Dimitrios; Minakou, Chara; Miralles, Ignacio; Movedi, Ermes; Nutini, Francesco; Pagani, Valentina; Palombo, Angelo; DI Paola, Francesco; Pascucci, Simone; Pignatti, Stefano; RAMPINI, ANNA; Ranghetti, Luigi; Ricciardelli, Elisabetta; Romano, Filomena; Stavrakoudis, Dimitris; STROPPIANA, DANIELA; VIGGIANO, MARIASSUNTA; BOSCHETTI, MIRCO Institute of Electrical and Electronics Engineers (IEEE) (2017-04)
      The ERMES agromonitoring system for rice cultivations integrates EO data at different resolutions, crop models, and user-provided in situ data in a unified system, which drives two operational downstream services for rice ...

    • openAccess   Dual electro-optic comb spectroscopy using a single pseudo-randomly driven modulator 

      Durán, Vicente; Escobar-Vera, Camilo; Soriano-Amat, Miguel; Martins, Hugo; Martin-Lopez, Sonia; Gonzalez-Herraez, Miguel; Fernández Ruiz, María del Rosario Optica Publishing Group (2022-07-04)
      We present a dual-comb scheme based on a single intensity modulator driven by inexpensive board-level pseudo-random bit sequence generators. The result is a simplified architecture that exhibits a long mutual coherence ...

    • openAccess   Dual-mode optical microscope based on single-pixel imaging 

      Rodríguez Jiménez, Ángel David; Clemente Pesudo, Pedro Javier; Tajahuerce, Enrique; Lancis, Jesús Elsevier (2016-03)
      We demonstrate an inverted microscope that can image specimens in both reflection and transmission modes simultaneously with a single light source. The microscope utilizes a digital micromirror device (DMD) for patterned ...

    • openAccess   Dynamic Control of Interference Effects Between Optical Filaments through Programmable Optical Phase Modulation 

      Borrego Varillas, Rocío; Pérez Vizcaíno, Jorge; Mendoza-Yero, Omel; Vázquez de Aldana, Javier R.; Mínguez-Vega, Gladys; Lancis, Jesús IEEE (2016-06)
      Light beams shaped by programmable megapixel spatial light modulators (SLMs) are key to broadening the applications of photonics. In this paper, we consider the application of a SLM for the generation of two mutually ...

    • openAccess   Dynamic freeform diffractive lens 

      Mendoza-Yero, Omel Optica Publishing Group (2023-03-31)
      In the framework of the scalar theory of diffraction a surface-pixeled convergent lens for arbitrary amplitude and phase modulation along the depth of focus is introduced. This complex diffractive lens is computer-generated ...

    • openAccess   Dynamics of Fractional Vortex Beams at Fraunhofer Diffraction Zone 

      Peters, Eduardo; Funes, Gustavo; Martínez-León, Lluís; Tajahuerce, Enrique MDPI (2022-07-09)
      Fractional vortex beams (FVBs) possess unique topological properties that are manifested in the vortex distribution. However, there are still discrepancies in the value of the vortex strength of FVBs at the far field. In ...