7,330 research outputs found

    Prompt photon, Drell-Yan and Bethe-Heitler processes in hard photoproduction

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    We present prospects and requirements for the study at HERA of hard photon processes which generate high pTp_T photons in the final state, and processes which generate Drell-Yan lepton pairs.Comment: 6 pages, 3 embedded figures. To appear in the proceedings of the workshop "Future physics at HERA

    Estimation of qualitative and quantitative characteristics interrelation, having an impact on amount of tourists in hospitality industry

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    The article considers methods of estimation of qualitative and quantitative characteristics interrelation, having impact on amount of tourists in hospitality industry, offers the latest technologies of the given indicators calculation

    Dissipation of Quantum Turbulence in the Zero Temperature Limit

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    Turbulence, produced by an impulsive spin-down from angular velocity Omega to rest of a cube-shaped container, is investigated in superfluid 4He at temperatures 0.08 K - 1.6 K. The density of quantized vortex lines L is measured by scattering negative ions. Homogeneous turbulence develops after time t of approximately 20 \Omega and decays as L proportional to t^(-3/2). The corresponding energy flux epsilon = nu' (kappa L)^2, which is proportional to t^(-3), is characteristic of quasi-classical turbulence at high Re with a saturated energy-containing length. The effective kinematic viscosity in the T=0 limit is nu' = 0.003 kappa, where kappa=10^(-3) cm^2 / s is the circulation quantum.Comment: 4 pages, 5 figures. Updated following referees comment

    Making the Best of Polymers with Sulfur–Nitrogen Bonds: From Sources to Innovative Materials

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    Polymers with sulfur–nitrogen bonds have been underestimated for a long time, although the intrinsic characteristics of these polymers offer a myriad of superior properties (e.g., degradation, flame retardancy, film‐forming ability, good solubility in polar solvents, and high refractivity with small chromatic dispersions, among other things) compared to their carbon analogues. The remarkable characteristics of these polymers result from the unique chemical properties of the sulfur–nitrogen bond (e.g., its polar character and the multiple valence states of sulfur), and thus open excellent perspectives for the development of innovative (bio)materials. Accordingly, this review describes the most common chemical approaches toward the efficient synthesis of these ubiquitous polymers possessing diverse sulfur–nitrogen bonds, and furthermore highlights their applications in multiple fields, ranging from biomedicine to energy storage, with the aim of providing an informative perspective on challenges facing the synthesis of sulfur–nitrogen polymers with desirable properties

    Influence of antidysbiotic drugs on the liver of rats with experimental non-alcoholic steatohepatitis

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    High-fat diets combined with the introduction of lincomycin causes the development of steatohepatitis. Introduction antidysbiotic drugs (pro- and prebiotics) has a therapeutic effect