Применение информационных технологий в туризме: интерактивная информационная система-экскурсовод

Цель работы: проанализировать достаточный набор функций интерактивной программы-экскурсовода и найти возможные методы ее реализации

INDIGO-DataCloud: a Platform to Facilitate Seamless Access to E-Infrastructures

[EN] This paper describes the achievements of the H2020 project INDIGO-DataCloud. The project has provided e-infrastructures with tools, applications and cloud framework enhancements to manage the demanding requirements of scientific communities, either locally or through enhanced interfaces. The middleware developed allows to federate hybrid resources, to easily write, port and run scientific applications to the cloud. In particular, we have extended existing PaaS (Platform as a Service) solutions, allowing public and private e-infrastructures, including those provided by EGI, EUDAT, and Helix Nebula, to integrate their existing services and make them available through AAI services compliant with GEANT interfederation policies, thus guaranteeing transparency and trust in the provisioning of such services. Our middleware facilitates the execution of applications using containers on Cloud and Grid based infrastructures, as well as on HPC clusters. Our developments are freely downloadable as open source components, and are already being integrated into many scientific applications.INDIGO-Datacloud has been funded by the European Commision H2020 research and innovation program under grant agreement RIA 653549.Salomoni, D.; Campos, I.; Gaido, L.; Marco, J.; Solagna, P.; Gomes, J.; Matyska, L.... (2018). INDIGO-DataCloud: a Platform to Facilitate Seamless Access to E-Infrastructures. Journal of Grid Computing. 16(3):381-408. https://doi.org/10.1007/s10723-018-9453-3S381408163García, A.L., Castillo, E.F.-d., Puel, M.: Identity federation with VOMS in cloud infrastructures. In: 2013 IEEE 5Th International Conference on Cloud Computing Technology and Science, pp 42–48 (2013)Chadwick, D.W., Siu, K., Lee, C., Fouillat, Y., Germonville, D.: Adding federated identity management to OpenStack. Journal of Grid Computing 12(1), 3–27 (2014)Craig, A.L.: A design space review for general federation management using keystone. 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First Observation of Visible Luminescence from Trivalent Gadolinium

The $\text{}^{6}$G$\text{}_{J}$ → $\text{}^{6}$P$\text{}_{J}$ emission for Gd$\text{}^{3+}$ in LiYF$\text{}_{4}$ around 600 nm is reported. As far as we are aware, this is the first observation of visible luminescence from trivalent gadolinium

Spin-allowed and spin-forbidden fd\mathrm{fd} emission from Er3+\mathrm{Er^{3+}} and LiYF4\mathrm{LiYF_4}

Luminescence measurements in the vacuum ultraviolet of 4f11→4f105d transitions on Er3+ in LiYF4have shown the presence of a weak fd band. The weakness of the band is explained by the spin-forbidden character of transitions from the ground state to this fd state, which is at lower energy than the spin-allowed fd bands. Upon excitation in the spin-allowed fd bands, both fast spin-allowed fdemission (τ=5 ns) and slow spin-forbidden fd emission (τ>2 μs) are observed. These results can be understood with a configurational coordinate diagram analogous to the Jablonski diagrams that are used to explain the fluorescence and phosphorescence from organic molecules

Visible quantum cutting in Eu3+\mathrm{Eu^{3+}}-doped gadolinium fluorides via downconversion

Emission of two photons of visible light per absorbed vacuum ultraviolet photon (known as quantum cutting) is reported for LiGdF4 : Eu3+ and GdF3 : Eu3+. For every Gd3+ ion excited in the 6GJ levels (around 50 000 cm−1) or higher, two visible photons can be emitted due to 5DJ→7FJ transitions on two Eu3+ ions. The first Eu3+ ion is excited into the 5D0 level by cross relaxation of the energy corresponding to the 6GJ→6PJ transition on Gd3+. The second Eu3+ ion is excited by direct energy transfer of the remaining energy from Gd3+ (6PJ) to Eu3+. It is shown that this two-step energy transfer process is very efficient at room temperature. Since this process is the opposite of the well-known upconversion process, we call it downconversion

Vacuum-ultraviolet spectroscopy and quantum cutting for Gd3+\mathrm{Gd^{3+}} in LiYF4\mathrm{LiYF_4}

A systematic spectroscopic study of the 4f7 energy levels of Gd3+ in LiYF4 in the vacuum-ultraviolet spectral region (50000–70000cm−1) is reported. Using energy-level calculations, all observed spectral lines could be assigned to free-ion term symbols (including term symbols with unusually high L and J,e.g., a 2Q23/2 level around 67000cm−1). From the 6GJ levels around 50000cm−1 quantum cutting (or two-photon luminescence, photon-cascade emission) is observed: the emission of a red photon due to the 6GJ→6PJ transition is followed by the emission of an ultraviolet photon due to the 6PJ→8S7/2transition

Time-resolved vacuum ultraviolet spectroscopy of Er3+Er3^+ ions in the SrF2SrF_2 crystals

The photoluminescence and photoexcitation spectra as well as the luminescence decay kinetics of Er3+ ions in the visible ultraviolet and vacuum ultraviolet (VUV) regions have been studied by the method of low-temperature, time-resolved VUV-spectroscopy on excitation by synchrotron radiation. In the VUV spectral region of the luminescence of SrF2:1% Er3+, the 146.5-nm band with a time of decay of less than 0.6 nsec was revealed together with the well-known emission band at 164.3 nm (decay constant in the microsecond range). Its possible nature is discussed. The specific features of the formation of photoexcitation spectra of the f-f and f-d transitions in the Er3+ ion are considered. Competition between the processes of excitation of f-f and d-f luminescence has been revealed. It manifests itself in the inverse relationship of their photoexcitation spectra in a range of energies of incident photons that are close to the position of the 4fn-15d configuration levels. © 2005 Springer Science+Business Media, Inc.This work was carried out with the support of grants from the Russian Fundamental Research Foundation (05-02-16530), "Universities of Russia (UR 02.01.433), Ural Scientific Center Promising Materials" CRDF (EK-005-XI), and partially from BMBF (05KS8GMD/1)