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  • SCL seminar by Ivana Stankovic
    chemical kinetics as well as fluid dynamics Any method for accurately predicting auto ignition phenomena must incorporate unsteady chemistry detailed chemical mechanisms and of course turbulence Large Eddy Simulation LES has a considerable potential to represent time dependent turbulent combustion and to combine cost effectiveness with accuracy However combustion is a sub grid phenomenon and therefore modeling is required The approach used here is the Conditional Moment Closure CMC an advanced turbulent reacting flow method where the fluctuations of the reactive scalars are considered to be correlated with those of the mixture fraction We present an application of Conditional Moment Closure CMC in Large Eddy Simulations LES of hydrogen auto ignition in turbulent flows Two well documented experiments are investigated the Cambridge and the Berkeley experiments In both experiments the fuel is hydrogen diluted with nitrogen igniting after mixing with pre heated co flow stream The levels of dilution are strongly different In the Cambridge experiment different operating regimes were observed ranging from random spots regime flashback regime to lifted flame regime These regimes were obtained by changing the co flow temperature and or the inflow velocities In the Berkeley experiment on the other hand a higher ratio between fuel

    Original URL path: http://www.scl.rs/news/851-scl-seminar-by-ivana-stankovic (2016-02-10)
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  • SCL seminar by Jelena Smiljanic
    two generic models i e Barabàsi Albert scale free network and scale free network on lattice and the academic router networks of the Netherlands and France We propose a dynamic deflection routing algorithm which automatically extends path of the packet before it arrives at congested node The simulation results indicate that the dynamic routing strategy can further reduce the number of dropped packets in a combination with the efficient path

    Original URL path: http://www.scl.rs/news/852-scl-seminar-by-jelena-smiljanic (2016-02-10)
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  • Seminar by Rene Messina
    of ionic mixtures in two dimensions will be presented as well Upon varying the size ratio the stable two dimensional crystalline lattices consist of square triangular and rhombic crystals as well as a ion pair gas and a gas of one dimensional crystalline chains Thereby we confirm the square structure found experimentally on charged granulates and predict new phases detectable in experiments on granular and colloidal matter Results concerning the crystallization of ionic mixtures in two dimensions will be presented as well Upon varying the size ratio the stable two dimensional crystalline lattices consist of square triangular and rhombic crystals as well as a ion pair gas and a gas of one dimensional crystalline chains Thereby we confirm the square structure found experimentally on charged granulates and predict new phases detectable in experiments on granular and colloidal matter It is well known from solid state studies that strongly confined i e quasi two dimensional or even one dimensional systems exhibit properties and a phase behavior that may drastically differ from those in the bulk Such features are also vivid in colloidal systems and those materials represent ideal model systems to analyze experimentally as well as theoretically and understand confinement effects

    Original URL path: http://www.scl.rs/news/853-seminar-by-prof-dr-rene-messina (2016-02-10)
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  • SCL Seminar by Antun Balaz
    superfluid depletion the equation of state and the sound velocity For a pure contact interaction and a vanishing correlation length we will reproduce the seminal results of Huang and Meng which were originally derived within a Bogoliubov theory around a disorder averaged background field For dipolar interaction and isotropic Lorentzian correlated disorder the obtained results are qualitatively similar to the case of an isotropic Gaussian correlated disorder In the case

    Original URL path: http://www.scl.rs/news/858-scl-seminar-by-antun-balaz-858 (2016-02-10)
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  • SCL Seminar by N. Vukmirovic
    atoms the dominant part of the calculation scales linearly with the size of the system when all the states within a fixed energy interval are required 1 The method was then applied to calculate the electronic states in disordered semiconducting polymers We find that the hole states are localized due to the fluctuations of the electrostatic potential and not by the breaks in the conjugation of the polymer chain The

    Original URL path: http://www.scl.rs/news/860-scl-seminar-by-n-vukmirovic (2016-02-10)
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  • SCL Seminar by Milica Milovanovic
    lattice and may be quantified by Berry curvature and Fubini Study quantum distance metric that depend on Bloch momentum in Brillouin zone The usual FQH effect would correspond to a uniform background constant curvature and metric with a fixed relationship In this talk 3 we will study the static structure factor of the FCI Laughlin like state and provide analytical forms for this quantity in the long distance limit In the course of this we will identify averaged over Brillouin zone Fubini Study metric as the relevant metric in the long distance limit We will discuss under which conditions the static structure factor will assume the usual behavior of Laughlin like FQH system i e the scenario of Girvin MacDonald and Platzman Phys Rev B 32 8458 1986 and study the influence of the departure of the averaged over Brilloin zone Fubini Study metric from its FQH value This departure appears in the long distance analysis as an effective change of the filling factor According to our exact diagonalization results on the Haldane model and analytical considerations we find persistence of FCI state even in this region of the parameter space 1 M Z Hasan and C L Kane Colloquium

    Original URL path: http://www.scl.rs/news/861-scl-seminar-by-milica-milovanovic (2016-02-10)
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  • SCL Seminar by Zoran Ikonic
    with Si CMOS processing They enable independent variation of band gaps and lattice constant and can be used in both lattice matched and strained layer structures With the possibility of emission and absorption in the near and mid IR range there is prospect of applications for interband and quantum cascade lasers photodetectors electro absorption and electro optic modulators etc The direct gap most important for emission may be brought about by alloy composition alone or combined with strain In the context of group IV optoelectronics indirect gap SiGeSn alloys can also serve as barrier layers in structures based on GeSn or Ge quantum wells or for the virtual substrate stressor purposes Reliable growth of high quality SiGeSn structures has proved quite challenging With a very small equilibrium solubility of Sn and large lattice mismatch between Sn and Ge Si the SiGeSn system is metastable and cannot be readily produced in bulk form and heterostructures may suffer from strain relaxation The recent successes in this field pave the way towards materials that combine the optical properties of III Vs and silicon s low cost manufacturability The present status of theoretical understanding and experimental achievements in the development of SiGeSn material for

    Original URL path: http://www.scl.rs/news/867-scl-seminar-by-zoran-ikonic (2016-02-10)
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  • SCL Seminar by Branislav Nikolic
    the bulk akin to conventional band insulators while hosting metallic edge in two dimensions 2D or surface in three dimensions 3D states Their the low energy quasiparticles behave as massless Dirac fermions whose spins are locked to their momenta due to spin orbit coupling of the Rashba type which is however order of magnitude larger than its more familiar counterpart in two dimensional electron gases within semiconductor heterostructures The TIs have attracted considerable attention by the basic research communities because of offering a platform to probe exotic particles borrowed from high energy physics such as axions magnetic monopoles and Majorana fermions as well as by the applied research communities interested in spintronics and quantum computing In this talk I will discuss possible routes to integrate 2D such as graphene with heavy adatoms or 3D such as BiSe layered compounds TIs into spintronic heterostructures with ferromagnets F that would make it possible to test our theoretical predictions for i quantized spin and charge pumping in 2DTI F heterostructures ii spin transfer torque in vertical and lateral 3DTI F heterostructures and iii spin Seebeck effect in three terminal 3DTI F devices News 12 February 2016 SCL Seminar by Jelena Smiljanic 12 January

    Original URL path: http://www.scl.rs/news/868-scl-seminar-by-branislav-nikolic (2016-02-10)
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