Search results for "NET"
showing 10 items of 55461 documents
Vacancy-like Dressed States in Topological Waveguide QED
2020
We identify a class of dressed atom-photon states formingat the same energy of the atom at any coupling strength. As a hallmark, their photonic component is an eigenstate of the bare photonic bath with a vacancy in place of the atom. The picture accommodates waveguide-QED phenomena where atoms behave as perfect mirrors, connecting in particular dressed bound states (BS) in the continuum or BIC with geometrically-confined photonic modes. When applied to photonic lattices, the framework provides a general criterion to predict dressed BS in lattices with topological properties by putting them in one-to-one correspondence with photonic BS. New classes of dressed BS are thus predicted in the pho…
Entanglement entropy in a periodically driven quantum Ising chain
2016
We numerically study the dynamics of entanglement entropy, induced by an oscillating time periodic driving of the transverse field, h(t), of a one-dimensional quantum Ising chain. We consider several realizations of h(t), and we find a number of results in analogy with entanglement entropy dynamics induced by a sudden quantum quench. After short-time relaxation, the dynamics of entanglement entropy synchronises with h(t), displaying an oscillatory behaviour at the frequency of the driving. Synchronisation in the dynamics of entanglement entropy, is spoiled by the appearance of quasi-revivals which fade out in the thermodynamic limit, and which we interpret using a quasi-particle picture ada…
Aggregation of [Ln(12)(III)] clusters by the dianion of 3-formylsalicylic acid. Synthesis, crystal structures, magnetic and luminescence properties
2019
Three isostrucutral dodecanuclear clusters with the general formula [Ln(12)(fsa)(12)(mu f(3)-OH)(12)(DMF)(12)]center dot nDMF (fsa(2-) is the dianion of 3-formylsalicylic acid; Ln = Eu 1, Gd 2, Dy 3) have been obtained from the reaction of fromylsalicyclic acid (H(2)fsa), tetrabutylammonium hydroxide and Ln(NO3)(3)center dot 6H(2)O in methanol/DMF. Their structure consists of four vertex-sharing heterocubanes. Each heterocubane unit is assembled from four Ln(III) ions, three mu(3)-OH groups and one mu(3)-oxygen atom arising from the fsa(2-) carboxylato group. The photophysical properties of the europium derivative investigated at both 300 and 80 K sustain a relative intense emission obtaine…
Color Sensitive Response of Graphene/Graphene Quantum Dot Phototransistors
2019
We present the fabrication and characterization of all-carbon phototransistors made of graphene three terminal devices, coated with atomically precise graphene quantum dots (GQD). Chemically synthesized GQDs are the light absorbing materials, while the underlying chemical vapor deposition (CVD)-grown graphene layer acts as the charge transporting channel. We investigated three types of GQDs with different sizes and edge structures, having distinct and characteristic optical absorption in the UV–vis range. The photoresponsivity exceeds 106 A/W for vanishingly small incident power (<10–12 W), comparing well with state of the art sensitized graphene photodetectors. More importantly, the photor…
Superconductivity near a magnetic domain wall
2018
We study the equilibrium properties of a ferromagnetic insulator/superconductor structure near a magnetic domain wall. We show how the domain wall size is affected by the superconductivity in such structures. Moreover, we calculate several physical quantities altered due to the magnetic domain wall, such as the spin current density and local density of states, as well as the resulting tunneling conductance into a structure with a magnetic domain wall.
Atom-field dressed states in slow-light waveguide QED
2015
We discuss the properties of atom-photon bound states in waveguide QED systems consisting of single or multiple atoms coupled strongly to a finite-bandwidth photonic channel. Such bound states are formed by an atom and a localized photonic excitation and represent the continuum analog of the familiar dressed states in single-mode cavity QED. Here we present a detailed analysis of the linear and nonlinear spectral features associated with single- and multi-photon dressed states and show how the formation of bound states affects the waveguide-mediated dipole-dipole interactions between separated atoms. Our results provide a both qualitative and quantitative description of the essential strong…
MoMo: enabling hybrid museums
2005
Present-day museums are not mere passive institutions for the preservation of a society's cultural heritage. They have become instead learning environments, research centres and even tourist attractions. The paper introduces the notion of a hybrid museum (HM) in which wireless personal digital devices (PDAs) are used to tailor digital contents to the visitor to enrich both the learning and entertainment experience. The paper describes a fully functional hybrid museum infrastructure (MoMo) implemented with the.NET compact framework running on the PocketPC platform. Several research challenges that had to be faced during the implementation of the system such as the exploration of large sets o…
Sporta komandas pārvaldības lietotne
2021
Kvalifikācijas darba mērķis ir izstrādāt sporta komandas pārvaldības lietotni, kuru var izmantot gan treneri, gan sportisti, lai atvieglotu darbu ar komandu individuālajos sporta veidos. Lietotne ir paredzēta, lai treneri varētu viegli izveidot treniņus sportistiem, kā arī piefiksēt datus priekš vēstures, lai varētu pēc laika atskatīties uz paveikto. Lietotnes izstrādē tika izmantota ASP.NET MVC Core 3.0 tehnoloģija un ietvari jQuery, Bootstrap, jQueryUI, KnockoutJS, un valodas C#, HTML5, JavaScript, CSS.
Projektu un klientu moduļa izstrāde personālvadības sistēmā
2019
Kvalifikācijas darbā "Projektu un klientu moduļa izstrāde personālvadības sistēmā", izstrādāti tīmekļa lietojumprogrammas "Tildes Jumis Personāls" projektu un klientu moduļi, kas personālvadības sistēmas lietotājiem ļauj sistēmā reģistrēt projektus un klientus, kā arī reģistrētos projektus sasaistīt ar sistēmā reģistrētajiem klientiem un darbiniekiem un to amatiem. Izstrādātie moduļi ir sistēmas funkcionalitātes papildinājumu pirmais etaps, un tos tālāk paredzēts izmantot, lai sistēmas lietotājiem nodrošinātu iespēju norakstīt darbinieku darba stundas pa projektiem. Moduļu izstrādē izmantotās tehnoloģijas ir Angular, Microsoft .NET Core, DevExtreme.
Servisu orientētas arhitektūras veiktspēja
2017
Mūsdienās, veidojot informācijas sistēmas, nepieciešams tās veidot elastīgas un daudzfunkcionālas, lai varētu nodrošināt klientu vēlmes un spēt sekot līdzi strauji mainīgajai pasaulei. Lai to nodrošinātu, informācijas sistēmas bieži tiek veidotas balstoties uz Servisu orientētu arhitektūru, kurā sistēmas funkcionālā daļa tiek veidota atsevišķi un smalki sadalīta. Darbā apskatītas servisu orientētas arhitektūras, to realizācija un pielietojumi, veiktspējas problēmas, un risinājumi, kā tās samazināt. Izmantojot iegūto informāciju, veikts šo risinājumu salīdzinājums, kurš izmantots lēmumu koka izveidē. Balstoties uz iegūto lēmumu koku, izvēlēts viens no risinājumiem, kas izmantots informācijas…