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Low-Cost Tiled Display System Architecture with Dynamic Web-Based Management

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China Communications 2022年第10期19卷 143-168页

作者： Daniel Marfil fernando Boronat f.javier Pastor Anna Vidal Communications Department Gandia CampusUniversitat Politecnica de ValenciaCalle Paraninfo146730Grao de GandiaValencia(Spain) Drawing Department Gandia CampusUniversitat Politecnica de ValenciaCalle Paraninfo146730Grao de GandiaValencia(Spain) Applied Mathematics Department Gandia CampusUniversitat Politecnica de ValenciaCalle Paraninfo146730Grao de GandiaValencia(Spain)

In this paper, a scalable hardware and software architecture for tiled display systems (a.k.a. videowalls), which can be implemented by using low-cost devices, together with a dynamic web-based management and configuration service are proposed. It has been designed to support both stored and live broadcast/broadband content, in mosaic or warp distributions. The displays and devices can be dynamically configured via web in different ways: the displays can create a single display of a larger size;or they can be configured in a customized way in order to playout different media contents in different display combinations. As display renderers, low-cost devices are proposed as the main hardware element to obtain affordable videowall systems. As a proof of concept, two prototypes have been implemented, including an accurate synchronization mechanism based on a Master/Slave control scheme and aggressive and smooth playout adjustment techniques. To evidence the good performance of the prototypes and configuration service, both objective and subjective evaluations have been conducted regarding synchronization accuracy and usability. On the one hand, the mean values of the asynchronies between the video playout processes in each display are kept below 25ms (i.e., frame accuracy). On the other hand, the obtained usability score in the System Usability Scale (SUS) test has been 88.65, which is considered as excellent.

关键词： AMP media synchronization multi-screen playout adjustment tiled displays videowall

Thermal manipulation of plasmons in atomically thin films

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Light(Science & Applications) 2020年第1期9卷 1179-1189页

作者： Eduardo J.C.Dias Renwen Yu f.javier Garcia de Abajo ICfO-Institut de Ciencies fotoniques The Barcelona Institute of Science and Technology08860 Castelldefels(Barcelona)Spain ICREA-Institucio Catalana de Recerca i Estudis Avançats Passeig Lluis Companys 2308010 BarcelonaSpain

Nanoscale photothermal effects enable important applications in cancer therapy,imaging and *** effects also induce substantial changes in the optical response experienced by the probing light,thus suggesting their application in all-optical ***,we demonstrate the ability of graphene,thin metal films,and graphene/metal hybrid systems to undergo photothermal optical modulation with depths as large as>70%over a wide spectral range extending from the visible to the terahertz frequency *** envision the use of ultrafast pump laser pulses to raise the electron temperature of graphene during a picosecond timescale in which its mid-infrared plasmon resonances undergo dramatic shifts and broadenings,while visible and near-infrared plasmons in the neighboring metal films are severely attenuated by the presence of hot graphene *** study opens a promising avenue toward the active photothermal manipulation of the optical response in atomically thin materials with potential applications in ultrafast light modulation.

关键词： pump visible films

Degenerative myopia: mechanical theories revisited

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Annals of Eye Science 2018年第1期3卷 132-135页

作者： f.javier Carreras Department of Surgery(Ophthalmology) Medical SchoolUniversity of GranadaGranadaSpain

The article discusses the early abandonment of mechanical theories about eye enlargement in degenerative myopia at the turn of the 20th *** that time,the number of theories about myopia grew unrestricted,but with scant support from the experimental *** mechanical theories vanished as a new wave of metabolism-based theories appeared,propelled by the huge advances in molecular *** techniques allow reconsidering those theories and to put them to test with higher confidence.

关键词： Degenerative myopia mechanical theories extra and intraocular muscles botulinum toxin(BT)

Radiative loss of coherence in free electrons:a long-range quantum phenomenon

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Light(Science & Applications) 2024年第2期13卷 294-301页

作者： Cruz I.Velasco Valerio Di Giulio f.javier García de Abajo ICfO-Institut de Ciencies fotoniques The Barcelona Institute of Science and Technology08860Castelldefels(Barcelona)Spain ICREA-InstitucióCatalana de Recerca i Estudis Avançats Passeig Lluís Companys 2308010BarcelonaSpain

Quantum physics rules the dynamics of small objects as they interact over microscopic length ***,quantum correlations involving macroscopic distances can be observed between entangled photons as well as in atomic gases and matter waves at low *** long-range nature of the electromagnetic coupling between charged particles and extended objects could also trigger quantum phenomena over large ***,we reveal a manifestation of quantum mechanics that involves macroscopic distances and results in a nearly complete depletion of coherence associated with which-way free-electron interference produced by electron-radiation coupling in the presence of distant extended *** is a ubiquitous effect that we illustrate through a rigorous theoretical analysis of a two-path electron beam interacting with a semi-infinite metallic plate and find the inter-path coherence to vanish proportionally to the path separation at zero temperature and exponentially at finite *** investigated regime of large distances originates in the coupling of the electron to radiative modes assisted by diffraction at material structures but without any involvement of material *** the fundamental interest of this macroscopic quantum phenomenon,our results suggest an approach to measuring the vacuum temperature and nondestructively sensing the presence of distant objects.

关键词： temperature quantum macroscopic

free-electron interactions with van der Waals heterostructures: a source of focused X-ray radiation

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Light(Science & Applications) 2023年第7期12卷 1370-1380页

作者： Xihang Shi Yaniv Kurman Michael Shentcis Liang Jie Wong f.javier Garcia de Abajo ldo Kaminero Solid State Institute and faculty of Electrical and Computer Engineering Technion-Israel Institute of TechnologyHaifa 32000Israel School of Electrical and Electronic Engineering Nanyang Technological University Singapore 639798Singapore ICfO-Institut de Ciencies fotoniques The Barcelona Institute of Science and TechnologyCastelldefels 08860Spain iCREA-lnstitucio Catalana de Recerca i Estudis Avangats Passeig Lluis Companys23Barcelona08010Spain

The science and technology of X-ray optics have come far,enabling the focusing of X-rays for applications in highresolution X-ray spectroscopy,imaging,and *** spite of this,many forms of tailoring waves that had substantial impact on applications in the optical regime have remained out of reach in the X-ray *** disparity fundamentally arises from the tendency of refractive indices of all materials to approach unity at high frequencies,making X-ray-optical components such as lenses and mirrors much harder to create and often less ***,we propose a new concept for X-ray focusing based on inducing a curved wavefront into the X-ray generation process,resulting in the intrinsic focusing of X-ray *** concept can be seen as effectively integrating the optics to be part of the emission mechanism,thus bypassing the effciency limits imposed by X-ray optical components,enabling the creation of nanobeams with nanoscale focal spot sizes and micrometer-scale focal ***,we implement this concept by designing aperiodic vdw heterostructures that shape X-rays when driven by free *** parameters of the focused hotspot,such as lateral size and focal depth,are tunable as a function of an interlayer spacing chirp and electron *** forward,ongoing advances in the creation of many-layer vdw heterostructures open unprecedented horizons of focusing and arbitrary shaping of X-ray nanobeams.

关键词： optics integrating arbitrary

Expeditious management plan towards digital earth

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International Journal of Digital Earth 2014年第8期7卷 635-649页

作者： Naveen Kumar Sidda Aneta J.florczyk francisco J.lopez-Pellicer Dinesh Babu I.V Ruben Bejar f.javier Zarazaga-Soria Department of Computer Science and System Engineering University of ZaragozaZaragozaSpain Department of Wood Science forestry and GeomaticsUniversity LavalSainte-FoyQCCanada

The breakthrough developments in geospatial technologies and the increasing availability of spatial data make geoinformation a business and a decisional element to the ***,it is important to have a management plan to factor in practical and feasible data sources,in building geo *** authors of this paper are motivated by the fact that right data sources could outclass in-house resources in various application *** paper outlines pragmatic cases for the tangible benefits of the existing potential data and expeditious patterns for digital *** work also proposes‘good-enough’solutions based on the pragmatic cases,available literature,and the 3D city model developed that could be sufficient in contriving the objectives of the common public usage and open business *** demonstrate this approach,the paper encapsulated the low-cost development of virtual 3D city model using publicly available cadastral data and web services.

关键词： spatial data sources geo management web services APIs cadastral data

The digital‘connected’earth:open technology for providing location-based services on degraded communication environments

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International Journal of Digital Earth 2018年第8期11卷 761-782页

作者： Ramón Piedrafita Rubén Béjar Rubén Blasco Alvaro Marco f.javier Zarazaga-Soria Aragón Aragón Institute of Engineering Research Universidad de ZaragozaZaragozaSpain

n the current world,it is easy to listen that everybody and everything is *** this connected world,the concept of location-based services has grown in order to provide digital services in everyplace and at every ***,this is not 100%true because the connection is not guaranteed for many people and in many *** are the Degraded Communications Environments(DCE),environments where the availability of high-speed communications is not guaranteed in at least the 75%of the *** paper works over the experience of a previous work in developing light protocols that do not need broadband for *** work provides an extension of these protocols for the inclusion of mobile devices as elements of the communication process and a set of libraries to allow the development of applications in *** work done has involved the development of two frameworks:an Android framework that makes the incorporation of Android devices easier and a server-based framework that provides the server side for the development of the referred applications.A use case that uses these two frameworks has been ***,all technology developed is available throw a public Git repository.

关键词： Location-based services degraded communications environments open technology

Spontaneous and stimulated electron-photon interactions in nanoscale plasmonic near fields

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Light(Science & Applications) 2021年第5期10卷 867-880页

作者： Matthias Liebtrau Murat Sivis Armin feisto Hugo Lourenco-Martins Nicolas Pazos-Pérez Ramon A.Alvarez Puebla f.javier Garcia de Abajo Albert Polman Claus Ropers Center for Nanophotonics AMOLF1098 XG AmsterdamThe Netherlands th Physical Institute-Solids and Nanostructures University of GÖttingen37077 GÖttingenGermany Max Plank Institute for Biophysical Chemistry 37077 GottingenGermany Department of Physical Chemistry and EMaS Universitat Rovira i Virgili43007 TarragonaSpain ICREA-Institucio Catalana de Recerca i Estudis Avangats 08010 BarcelonaSpain ICfO-Institut de Ciencies fotoniques The Barcelona Institute of Science and Technology08860 Castelldefels(Barcelona)Spain

The interplay between free electrons,light,and matter offers unique prospects for space,time,and energy resolved optical material characterization,structured light generation,and quantum information ***,we study the nanoscale features of spontaneous and stimulated electron–photon interactions mediated by localized surface plasmon resonances at the tips of a gold nanostar using electron energy-loss spectroscopy(EELS),cathodoluminescence spectroscopy(CL),and photon-induced near-field electron microscopy(PINEM).Supported by numerical electromagnetic boundary-element method(BEM)calculations,we show that the different coupling mechanisms probed by EELS,CL,and PINEM feature the same spatial dependence on the electric field distribution of the tip ***,the electron–photon interaction strength is found to vary with the incident electron velocity,as determined by the spatial fourier transform of the electric near-field component parallel to the electron *** the tightly confined plasmonic tip resonances,our calculations suggest an optimum coupling velocity at electron energies as low as a few *** results are discussed in the context of more complex geometries supporting multiple modes with spatial and spectral *** provide fundamental insights into spontaneous and stimulated electron-light-matter interactions with key implications for research on(quantum)coherent optical phenomena at the nanoscale.

关键词： photon quantum coupling

Quantum-mechanical effects in photoluminescence from thin crystalline gold films

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Light(Science & Applications) 2024年第4期13卷 783-794页

作者： Alan R.Bowman Alvaro Rodríguez Echarri fatemeh Kiani fadil Iyikanat Ted V.Tsoulos Joel D.Cox Ravishankar Sundararaman f.javier García de Abajo Giulia Tagliabue Laboratory of Nanoscience for Energy Technologies(LNET) STIÉcole Polytechnique Fédérale de Lausanne(EPFL)LausanneSwitzerland ICfO–Institut de Ciencies fotoniques The Barcelona Institute of Science and TechnologyCastelldefels(Barcelona)Spain. MBI–Max-Born-Institut BerlinGermany. POLIMA–Center for Polariton-driven Light–Matter Interactions University of Southern DenmarkOdense MDenmark. Danish Institute for Advanced Study University of Southern DenmarkOdense MDenmark. Department of Materials Science&Engineering Rensselaer Polytechnic InstituteTroyNYUSA. Department of Physics Applied Physicsand AstronomyRensselaer Polytechnic InstituteTroyNYUSA. ICREA–Institucio Catalana de Recerca i Estudis Avancats BarcelonaSpain

Luminescence constitutes a unique source of insight into hot carrier processes in metals,including those in plasmonic nanostructures used for sensing and energy ***,being weak in nature,metal luminescence remains poorly understood,its microscopic origin strongly debated,and its potential for unraveling nanoscale carrier dynamics largely ***,we reveal quantum-mechanical effects in the luminescence emanating from thin monocrystalline gold ***,we present experimental evidence,supported by first-principles simulations,to demonstrate its photoluminescence origin(i.e.,radiative emission from electron/hole recombination)when exciting in the interband *** model allows us to identify changes to the measured gold luminescence due to quantum-mechanical effects as the gold film thickness is ***,such effects are observable in the luminescence signal from flakes up to 40 nm in thickness,associated with the out-of-plane discreteness of the electronic band structure near the fermi *** qualitatively reproduce the observations with first-principles modeling,thus establishing a unified description of luminescence in gold monocrystalline flakes and enabling its widespread application as a probe of carrier dynamics and light-matter interactions in this *** study paves the way for future explorations of hot carriers and charge-transfer dynamics in a multitude of material systems.

关键词： luminescence quantum crystalline