1,434 research outputs found

    Beyond the black disk limit: from shadow to antishadow scattering mode

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    New mode in the hadron scattering is predicted to appear at the energies beyond s‚ČÉ2\sqrt{s}\simeq 2 TeV: the antishadow scattering mode and the experiments at LHC and VLHC in hadronic reactions will be able to reveal it. The appearance of the antishadow scattering mode at these energies is considered on the basis of unitarity and geometrical notions of hadron interactions. Connections with the nonperturbative--QCD models are discussed.Comment: 25 pages, 2 figure

    Reflective Elastic Scattering at LHC

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    We discuss effects of reflective scattering for hadron and heavy nuclei collisions at the LHC and asymptotical energies. It is shown that the reflective scattering might lead to decreasing matter density with energy beyond the LHC energies. Limiting form of energy dependence of hadron density is obtained. Unitarity upper bound for the absolute value of the real part of elastic scattering amplitude and two-particle inelastic binary reactions amplitudes in impact parameter representation is two times less than the corresponding bound for the imaginary part of the elastic scattering amplitude. The former limit restricts a possible odderon contribution.Comment: 7 pages, 1 figure, talk given at the EDS'09 Conferenc

    Stabilizing perovskite solar cells with modified indium oxide electron transport layer

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    Despite the impressive progress, the perovskite solar cells are still under the stage of laboratory research, mainly because of their inferior operational stability. To improve the device lifetime, one of the most important strategies is to eliminate the undesirable side reactions between the functional layers. In this study, we present the thermal oxidation method to yield high-quality pristine and modified indium oxide films applied as efficient electron transport layers (ETLs) for perovskite cells in a planar n-i-p configuration. The cells incorporating In2O3 as ETL material can deliver comparable efficiencies with the reference SnO2- based devices while showing much superior operational stability. We attributed the observed stabilizing effect of indium oxide to its reduced chemical activity at the interface with the perovskite absorber layer. In particular, In2O3 can hardly oxidize I- to molecular iodine on the contrary to SnO2 and TiO2 known for their photocatalytic activity. We believe that this study may provide researchers with general guidelines to develop a large variety of ETL materials for efficient yet stable perovskite cells

    Reynolds Stress Model Adjustments for Separated Flows

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    The development of a new Reynolds stress model suitable for computations of separated flows is described. It is based on the recently published version of SSG/LRRmodel, which includes a correction eliminating streamline back-bending near the reattachment point. Modifications are proposed which reduce the turbulence kinetic energy dissipation rate and pressure-strain term near the separation point. The validation results using the Diverging channel flow test case are presented. The quality of the obtained results is assessed

    Adaptive Regularized Zero-Forcing Beamforming in Massive MIMO with Multi-Antenna Users

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    Modern wireless cellular networks use massive multiple-input multiple-output technology. This involves operations with an antenna array at a base station that simultaneously serves multiple mobile devices that also use multiple antennas on their side. For this, various Beamforming and Detection techniques are used, allowing each user to receive the signal intended for him from the base station. There is an important class of linear Precoding called Regularized Zero-Forcing. In this work, we propose a special kind of regularization matrix with different regularizations for different UE, using singular values of multi-antenna users. The proposed algorithm has a simple analytical formula and is provided with theoretical study. We also show the results in comparison with other linear Precoding algorithms on simulations with the Quadriga channel model. The proposed approach leads to a significant increase in quality with the same computation time as in the baseline methods.Comment: 14 pages, 7 figures, 3 table

    Energy Resolution Performance of the CMS Electromagnetic Calorimeter

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    The energy resolution performance of the CMS lead tungstate crystal electromagnetic calorimeter is presented. Measurements were made with an electron beam using a fully equipped supermodule of the calorimeter barrel. Results are given both for electrons incident on the centre of crystals and for electrons distributed uniformly over the calorimeter surface. The electron energy is reconstructed in matrices of 3 times 3 or 5 times 5 crystals centred on the crystal containing the maximum energy. Corrections for variations in the shower containment are applied in the case of uniform incidence. The resolution measured is consistent with the design goals

    Penilaian Kinerja Keuangan Koperasi di Kabupaten Pelalawan

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    This paper describe development and financial performance of cooperative in District Pelalawan among 2007 - 2008. Studies on primary and secondary cooperative in 12 sub-districts. Method in this stady use performance measuring of productivity, efficiency, growth, liquidity, and solvability of cooperative. Productivity of cooperative in Pelalawan was highly but efficiency still low. Profit and income were highly, even liquidity of cooperative very high, and solvability was good
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