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Mostrando ítems 692-711 de 751

    • openAccess   The Lisbon ranking for smart sustainable cities in Europe 

      Akande, Adeoluwa; Cabral, Pedro; Gomes, Paulo; Casteleyn, Sven Elsevier (2019)
      There has recently been a conscious push for cities in Europe to be smarter and more sustainable, leading to the need to benchmark these cities ’ e ff orts using robust assessment frameworks. This paper ranks 28 ...

    • openAccess   The Smartphone-Based Offline Indoor Location Competition at IPIN 2016: Analysis and FutureWork 

      Torres-Sospedra, Joaquín; Jiménez, Antonio R.; Knauth, Stefan; Moreira, Adriano; Beer, Yair; Fetzer, Toni; TA, Viet Cuong; Montoliu Colás, Raul; Seco, Fernando; Mendoza-Silva, Germán Martín; Belmonte-Fernández, Óscar; Koukofikis, Athanasios; Nicolau, Maria João; Costa, António; Meneses, Filipe; Ebner, Frank; Deinzer, Frank; Vaufreydaz, Dominique; Dao, Trung Kien; Castelli, Eric MDPI (2017)
      This paper presents the analysis and discussion of the off-site localization competition track, which took place during the Seventh International Conference on Indoor Positioning and Indoor Navigation (IPIN 2016). Five ...

    • openAccess   The Use of Machine Learning Techniques for Optimal Multicasting in 5G NR Systems 

      Chukhno, Nadezhda; Chukhno, Olga; Moltchanov, Dmitri; Gaydamaka, Anna; Samuylov, Andrey; Molinaro, Antonella; Koucheryavy, Yevgeni; IERA, Antonio; ARANITI, Giuseppe IEEE (2022-09-28)
      Multicasting is a key feature of cellular systems, which provides an efficient way to simultaneously disseminate a large amount of traffic to multiple subscribers. However, the efficient use of multicast services in ...

    • openAccess   The weak compactification of locally compact groups 

      Ferrer, María V.; Hernández, Salvador Elsevier (2021)
      We further investigate the weak topology generated by the irreducible unitary representations of a group G. A deep result due to Ernest [13] and Hughes [22] asserts that every weakly compact subset of a locally compact ...

    • openAccess   Theory of holey twistsonic media 

      Rosendo López, María; Zhang, Zhiwang; Torrent, Daniel; Christensen, Johan Springer Nature (2022-12-15)
      Rotating two overlapping lattices relative to each other produces the well known moiré interference patterns and has surprisingly led to strongly correlated superconductivity in twisted bilayer graphene. This seminal effect ...

    • closedAccess   The space-bandwidth product in the join ttransform correlator optical encryption setup 

      Cuadrado Laborde, Christian; Lancis, Jesús Elsevier (2011)
      In this work we study the joint transform correlator (JTC) optical encryption setup through the Wigner function. We found analytical expressions for the spatial and spatial frequency extent of the encrypted signal. Since ...

    • openAccess   Three Dimensional Visualization of Long Range Scenes by Photon Counting Mid-Wave Infrared Integral Imaging 

      Latorre Carmona, Pedro; Javidi, Bahram; LeMaster, Daniel (2015-07-03)
      Integral Imaging under photon counting conditions has found different three-dimensional (3D) imaging applications, including 3D image reconstruction and recognition. In this letter, we present the application of the maximum ...

    • openAccess   Three-dimensional fluorescence imaging using the transport of intensity equation 

      Rajput, Sudheesh; Kumar, Manoj; Quan, Xiangyu; Morita, Mitsuhiro; Furuyashiki, Tomoyuki; Awatsuji, Yasuhiro; Tajahuerce, Enrique; Matoba, Osamu SPIE (2019-11-12)
      We propose a nonscanning three-dimensional (3-D) fluorescence imaging technique using the transport of intensity equation (TIE) and free-space Fresnel propagation. In this imaging technique, a phase distribution corresponding ...

    • openAccess   Three-dimensional imaging with multiple degrees of freedom using data fusion 

      Latorre Carmona, Pedro; Pla, Filiberto; Stern, Adrián; Moon, Inkyu; Javidi, Bahram Institute of Electrical and Electronics Engineers (2015)
      This paper presents an overview of research work and some novel strategies and results on using data fusion in 3-D imaging when using multiple information sources. We examine a variety of approaches and applications ...

    • openAccess   Three-Dimensional Integral Imaging for Gesture Recognition Under Occlusions 

      Traver Roig, Vicente Javier; Latorre Carmona, Pedro; Salvador Balaguer, Eva; Pla, Filiberto; Javidi, Bahram Institute of Electrical and Electronics Engineers (IEEE) (2017-02)
      Over the last years, three-dimensional (3-D) imaging has been applied to human action and gesture recognition, usually in the form of depth maps from RGB-D sensors. An alternative which has not been explored is 3-D integral ...

    • closedAccess   Three-dimensional trees for virtual globes 

      Rebollo Santamaría, Cristina; Remolar, Inmaculada; Gumbau Portalés, Jesús; Chover, Miguel Taylor & Francis (2014)
      One of the problems in virtual globes technologies is the real-time representation of vegetal species. In forest or garden representations, the low detailed plants produce a lack of realism. Efficient techniques are required ...

    • openAccess   Time Expansion in Distributed Optical Fiber Sensing 

      Fernández Ruiz, María del Rosario; Soriano-Amat, Miguel; Durán, Vicente; Martins, Hugo; Martin-Lopez, Sonia; Gonzalez-Herraez, Miguel Institute of Electrical and Electronics Engineers (2023-05-01)
      Distributed optical fiber sensing (DOFS) technology has recently experienced an impressive growth in various fields including security, structural monitoring and seismology, among others. This expansion has been accompanied ...

    • openAccess   Time-expanded phase-sensitive optical time-domain reflectometry 

      Soriano-Amat, Miguel; Martins, Hugo; Durán, Vicente; Costa, Luís; Martin-Lopez, Sonia; Gonzalez-Herraez, Miguel; Fernández Ruiz, María del Rosario Light: Science & Applications (2021-03-09)
      Phase-sensitive optical time-domain reflectometry (ΦOTDR) is a well-established technique that provides spatio-temporal measurements of an environmental variable in real time. This unique capability is being leveraged in ...

    • openAccess   Time-expanded φOTDR using low-frequency electronics 

      Soriano-Amat, Miguel; Martins, Hugo; Martin-Lopez, Sonia; Gonzalez-Herraez, Miguel; Fernández Ruiz, María del Rosario; Durán, Vicente Optica Publishing Group (2023-01)
      Time expanded phase-sensitive optical time-domain reflectometry (TE-φOTDR) is a recently reported technique for distributed optical fiber sensing based on the interference of two mutually coherent optical frequency combs. ...

    • openAccess   Time-Resolved Sentinel-3 Vegetation Indices Via Inter-Sensor 3-D Convolutional Regression Networks 

      Fernandez-Beltran, Ruben; Ibáñez Fernández, Damián; kang, jian; Pla, Filiberto Institute of Electrical and Electronics Engineers (2021-09-03)
      Sentinel missions provide widespread opportunities of exploiting inter-sensor synergies to improve the operational monitoring of terrestrial photosynthetic activity and canopy structural variations using vegetation indices ...

    • openAccess   Topological States in Twisted Pillared Phononic Plates 

      Jin, Yabin; Wang, Wan; Wen, Zhihui; Torrent, Daniel; Djafari Rouhani, Bahram Elsevier (2020-09-20)
      In recent years, the advances in topological insulator in the fields of condensed matter have been extended to classical wave systems such as acoustic and elastic waves. However, the quantitative robustness study of ...

    • openAccess   Topological vortex mode for flexural waves in pillared plates 

      Wen, Zhihui; Iglesias Martínez, Julio Andrés; Jin, Yabin; Li, Yan; Djafari Rouhani, Bahram; Torrent, Daniel; Raynaud, Jean-louis; Khelif, Abdelkrim Elsevier (2023)
      Localized topological modes with high robustness to various perturbations are receiving increasing attention. Recently, zero-order topological vortex modes have been designed in phononic structures, in analogy with ...

    • openAccess   Toward Expanding the Optical Response of Ag2CrO4 and Bi2O3 by Their Laser-Mediated Heterojunction 

      Torres-Mendieta, Rafael; Teixeira, Mayara Mondego; Mínguez-Vega, Gladys; de Souza, Daniele; Galvão Gobato, Yara; Assis, Marcelo de; Beltrán Mir, Héctor; Cordoncillo, Eloisa; Andres, Juan; Cernik, Miroslav; Longo, Elson American Chemical Society (2020-11-18)
      The formation of heterojunctions between semiconductors with distinct properties usually expands their capabilities. In this context, many methodologies have been employed in pursuing efficient and fruitful heterojunctions. ...

    • openAccess   Towards the scale-up of the formation of nanoparticles on α -Ag 2 WO 4 with bactericidal properties by femtosecond laser irradiation 

      Assis, Marcelo de; Cordoncillo, Eloisa; Torres-Mendieta, Rafael; Beltrán Mir, Héctor; Mínguez-Vega, Gladys; Oliveira, Regiane; Leite, Edson R.; Foggi, Camila Cristina; Vergani, Carlos; Longo, Elson; Andres, Juan Nature Publishing Group (2018)
      In recent years, complex nanocomposites formed by Ag nanoparticles coupled to an α-Ag2WO4 semiconductor network have emerged as promising bactericides, where the semiconductor attracts bacterial agents and Ag nanoparticles ...

    • openAccess   TrackInFactory: A Tight Coupling Particle Filter for Industrial Vehicle Tracking in Indoor Environments 

      Silva, Ivo; Pendão, Cristiano; Torres-Sospedra, Joaquín; Moreira, A Institute of Electrical and Electronics Engineers (2021-07-06)
      Localization and tracking of industrial vehicles have a key role in increasing productivity and improving the logistics processes of factories. Due to the demanding requirements of industrial vehicle tracking and navigation, ...