Search results for "FOT"

showing 10 items of 1161 documents

Numerical simulation of Kerr nonlinear systems : analyzing non-classical dynamics

2019

Abstract We simulate coherent driven free dissipative Kerr nonlinear system numerically using Euler’s method by solving Heisenberg equation of motion and time evolving block decimation (TEBD) algorithm, and demonstrate how the numerical results are analogous to classical bistability. The comparison with analytics show that the TEBD numerics follow the quantum mechanical exact solution obtained by mapping the equation of motion of the density matrix of the system to a Fokker-Plank equation . Comparing between two different numerical techniques, we see that the semi-classical Euler’s method gives the dynamics of the system field of one among two coherent branches, whereas TEBD numerics genera…

PhysicsKerr nonlinear systemComputer simulationBistabilitybistabilitynumeeriset menetelmätDynamics (mechanics)General Physics and Astronomytime-evolving block decimation algorithm01 natural sciences114 Physical sciences010305 fluids & plasmasNonlinear systemsecond order correlation functionfotoniikka0103 physical sciencesStatistical physics010306 general physicskvanttifysiikka
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Soliton topology versus discrete symmetry in optical lattices

2005

We address the existence of vortex solitons supported by azimuthally modulated lattices and reveal how the global lattice discrete symmetry has fundamental implications on the possible topological charges of solitons. We set a general ``charge rule'' using group-theory techniques, which holds for all lattices belonging to a given symmetry group. Focusing in the case of Bessel lattices allows us to derive also a overall stability rule for the allowed vortex solitons.

PhysicsOptical communicationsHigh Energy Physics::LatticeFotònicaGeneral Physics and AstronomyFOS: Physical sciencesPattern Formation and Solitons (nlin.PS)Symmetry groupTopologyNonlinear Sciences - Pattern Formation and SolitonsVortexsymbols.namesake:Enginyeria de la telecomunicació::Telecomunicació òptica [Àrees temàtiques de la UPC]PhotonicsLattice (order)Bessel beamsymbolsComunicacions òptiquesSoliton:Enginyeria de la telecomunicació::Telecomunicació òptica::Fotònica [Àrees temàtiques de la UPC]Optical vortexBessel functionDiscrete symmetry
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Experimental Quantum Probing Measurements With No Knowledge on the System-Probe Interaction

2020

In any natural science, measurements are the essential link between theory and observable reality. Is it possible to obtain accurate and relevant information via measurement whose action on the probed system is unknown? In other words, can one be convinced to know something about the nature without knowing in detail how the information was obtained? In this paper, we show that the answer is surprisingly, yes. We construct and experimentally implement a quantum optical probing measurement where measurements on the probes, the photons' polarization states, are used to extract information on the systems, the frequency spectra of the same photons. Unlike the pre-existing probing protocols, our …

PhysicsQuantum PhysicsPhotonfotonitmittausFOS: Physical sciencesObservablePolarization (waves)01 natural sciences010305 fluids & plasmasOptical probing0103 physical sciencesStatistical physicsQuantum Physics (quant-ph)010306 general physicskvanttifysiikkakvantti-informaatioRelevant informationQuantum
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Reto un aizsargājamo piekrastes sugu propagulu dīgšana un dažāda vecuma augu augšana atkarībā no apbēršanas ar smiltīm

2016

Piekrastes teritorijas ir plaši sastopamas visā pasaulē. Latvijā piekrastes teritorijas sasniedz gandrīz 500 km. Piekrastes augi aug heterogēnā vidē, kurā vairāki suboptimāli faktori var eksistēt vienlaicīgi. Izmaiņas vienā vai vairākos vides faktoros izraisa atšķirīgu augu sabiedrību izveidošanos, balstoties uz sugu toleranci pret vides faktoru izmaiņām. Liela daļa piekrastes teritorijā sastopamo augu ir reti un aizsargājami. Reto un aizsargājamo augu izpētei nepieciešams izmantot nedestruktīvās analīzes metodes. Tādējādi nebojājot mehāniski augus. Zināms, ka fotosistēmas darbība ir svarīga augu attīstībā un dzīvošanā. Nedestruktīvās metodes ir labs veids, kā labāk izprast bioķīmisko pielā…

Piekrastes smilšu kāpasadaptācijaBioloģijapiekrastes augismilšu apbēršanafotosistēma II aktivitāte
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Nella giostra della social photography

2018

Oggi la fotografia va ben oltre la fissazione dei ricordi. Il volume riprende la nota ricerca di Bourdieu relativa agli usi sociali della fotografia intorno alla metà degli anni Sessanta. Da questa si desume che un tempo gli scatti dei non professionisti, mediati dall'habitus di classe, intercettavano i momenti topici della vita sociale e le tipicità espresse da una cultura condivisa. Mentre le foto dei professionisti aspiravano a riconoscere i momenti decisivi in senso autoriale in vari ambiti (reportage, moda, paesaggio, pubblicità…). Oggi, in virtù dell'accelerazione sociale, siamo incerti sulla direzione della Storia. Tutti i fenomeni sono potenzialità del mondo, come tutte le immagini …

Pierre Bourdieu habitus fotografatile fotografia usi sociali della fotografia campo social network fotografia social sociologia del tempo accelerazione sociale frame Analysis Arte selfie scattomania è stato momento decisivo tipicità topicitàSettore SPS/08 - Sociologia Dei Processi Culturali E ComunicativiPierre Bourdieu habitus photographic conception photography social uses of photography field social network social photography sociology of time social acceleration frame analysis art selfie snapshot it was a decisive moment typicality topicality
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Influencia del movimiento de vórtices de plasma en concentraciones magnéticas finas en la fotósfera solar

2016

High-resolution observations from ground-based (Solar Swedish Telescope) and space-borne (Hinode) solar telescopes acquired data with various filters, obtaining images of a quiet Sun region populated with small-scale magnetic elements. The region is also characterized by the presence of photospheric swirl convective plasma structures. This work abridges the results of different analysis applied over time series of images to follow the evolution of magnetic features aiming to establish the influence of the plasma vortices on their motions. Observaciones solares en alta resolución desde telescopios en tierra (SST) y en el espacio (Hinode) registraron datos con diferentes filtros, obteniendo i…

Plasma FotosféricoMagnetic FieldFísica SolarSolar PhysicsCampo MagnéticoPhotospheric Plasma
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Estilo y autoría en la información. Una aparente ausencia de identidad

2009

Dolors.Palau@uv.es Los textos periodísticos son un reflejo de los diversos estilos, de la diversidad de formas de ver y construir la realidad de los periodistas que los elaboran. Más allá de la prescripción y las posturas acríticas que han presidido la reflexión sobre estas cuestiones, este artículo aboga por un análisis que saque a la luz los mecanismos lingüísticos en los que se refleja el punto de vista, las estrategias que subyacen a una aparente ausencia de identidad, a una autoría pretendidamente enmascarada. Para ello parte de una revisión pluridisciplinar de los conceptos de estilo y autor, antes de proponer y aplicar un método de análisis pragmaestilístico. Journalistic articles ar…

Point of viewEstilos periodísticos ; Autoría ; Pragmaestilística ; Punto de vista ; PrensaPunto de vistaEstilos periodísticosPeriodismoAutoríaUNESCO::LINGÜÍSTICAAuthorshipPress:LINGÜÍSTICA [UNESCO]PrensaJournalistic styles ; Authorship ; Pragmastylistics ; Point of view ; PressJournalistic stylesPragmastylisticsPragmaestilísticaFotografía
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Mapováni spinů povrchových a bulkových Rashba stavů v tenkých vrstvách feroelektrického α-GeTe(111)

2015

Rozbíjení inverzní symetrie ve fereeleRashba efekt; Fotoemisse; DFTktrickém polovodiči způsobuje děleni stavů, tzv Rashba efekt. V tomto článku ukazujeme kompletně mapování spinové polarizace těchto Rashba stavů za pomoci spinovo rozlišené fotoemisse. The breaking of bulk inversion symmetry in ferroelectric semiconductors causes a Rashba-type spin splitting of electronic bulk bands. This is shown by a comprehensive mapping of the spin polarization of the electronic bands in ferroelectric α- GeTe(111) films using a time-of-flight momentum microscope equipped with an imaging spin filter that enables a simultaneous measurement of more than 10 000 data points. The experiment reveals an opposite…

Point reflectionFOS: Physical sciences02 engineering and technologyDFT01 natural sciencesCondensed Matter::Materials ScienceElectric field0103 physical sciencesRashba efectTexture (crystalline)010306 general physicsControlling collective statesSpin-½PhysicsCondensed Matter - Materials ScienceSpin polarizationCondensed matter physicsSpintronicsMaterials Science (cond-mat.mtrl-sci)021001 nanoscience & nanotechnologyHelicityFerroelectricityRashba efekt0210 nano-technologyphotoemissionfotoemise
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Introduzione ad Arte : Artworks, mimesis, agency

2021

Il volume raccoglie alcune delle relazioni tenute all’interno del ciclo di seminari Antropologia dell’arte, organizzato nel 2019 dall’Associazione per la conservazione delle tradizioni popolari in collaborazione con l’Accademia di Belle Arti di Palermo e curato da Rosario Perricone. Il seminario comprendeva diversi incontri durante i quali studiosi di diversi ambiti disciplinari hanno dibattuto su concetti, nozioni e oggetti che si pongono al crocevia tra le discipline dell’antropologia, della storia dell’arte, della semiotica, degli studi culturali, della visual culture, delineando talvolta fenomeni di ibridazione delle pratiche artistiche ed etnografiche e, talvolta, di dissolvenza delle …

Popular art in SicilyDolce &ampCanto flamencoFlamenco singingfotografiaPost-fotografiacontemporary artDolce&ampAlfred GelldonoArt Anthropology visual study Visual cultureArte popolare in SiciliaRituali Afro-CubaniSettore M-DEA/01 - Discipline DemoetnoantropologicheCampAfro-Cuban ritualtextumArte Antropologia visual study Visual cultureocchialicollezionismoagency mimesis creativity artworkselfieeyeglasseprehistoric artarte preistoricaphotographycollectingagency mimesis creatività artworkarte contemporaneaGabbanaPost-photographyNelson GoodmanLeviathangift
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Etnografie ad arte : agency, mimesis, creatività e pratica degli artworks

2021

Il volume raccoglie alcune delle relazioni tenute all’interno del ciclo di seminari Antropologia dell’arte, organizzato nel 2019 dall’Associazione per la conservazione delle tradizioni popolari in collaborazione con l’Accademia di Belle Arti di Palermo e curato da Rosario Perricone. Il seminario comprendeva diversi incontri durante i quali studiosi di diversi ambiti disciplinari hanno dibattuto su concetti, nozioni e oggetti che si pongono al crocevia tra le discipline dell’antropologia, della storia dell’arte, della semiotica, degli studi culturali, della visual culture, delineando talvolta fenomeni di ibridazione delle pratiche artistiche ed etnografiche e, talvolta, di dissolvenza delle …

Popular art in SicilyDolce &ampCanto flamencoFlamenco singingfotografiaPost-fotografiacontemporary artDolce&ampAlfred GelldonoArt Anthropology visual study Visual cultureArte popolare in SiciliaRituali Afro-CubaniSettore M-DEA/01 - Discipline DemoetnoantropologicheCampAfro-Cuban ritualtextumArte Antropologia visual study Visual cultureocchialicollezionismoagency mimesis creativity artworkselfieeyeglasseprehistoric artarte preistoricaphotographycollectingagency mimesis creatività artworkarte contemporaneaGabbanaPost-photographyNelson GoodmanLeviathangift
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