Results 1 - 10 of 453
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[en] A computer infrastructure constructed at JINR’s Laboratory of Particle Physics, purposed for the effective participation of JINR’s experts in ongoing experiments in particle and nuclear physics is presented. The principles of the design and construction of the PC farm are outlined, and the computer and information services used for effective application of distributed computer and information resources are described.
[en] Based on advanced quantum theory for the Λ-scheme nonlinear interaction of optical fields in atomic Bose-Einstein condensate, the regimes of giant negative nonlinearity and absorption coefficients have been obtained for a probe light pulse. The nonlinear laser amplifier setup (under the Λ-scheme realization) for generation of the quadrature-squeezed light is presented
[en] We have developed the baseline design for the straw drift tube tracking detectors for high-rate environment application. The low-mass inner straw elements and the technology of the multianode straws assembly were devised and checked. The prototype chamber was constructed and studied. The granularity of similar chambers can be reduced to 1 cm2.
[en] The aim of this work is to estimate the shower leakage from the CMS Endcap Hadron calorimeter (HE) due to electromagnetic secondaries and punch-through in the region of the ME1/1 Forward Muon Station. Two configurations are considered: with and without the CMS Endcap Electromagnetic calorimeter (EE). The experimental data have been taken during the combined beam test of CMS subdetectors (HE, ME, RPC, DT) at the CERN H2 beam facility in 2004. Serial CSC chambers (ready for installation in CMS) fully equipped with readout electronics have been exposed. Simulation of a beam test setup has been performed using the GEANT4-based simulation software package OSCAR.
[en] The system of real-time monitoring of physical data applied in NA-48, NA-48/1, and NA-48/2 experiments at CERN SPS is described. The system was the most automated independent subsystem of these experiments; it provided a possibility of on-the-fly detection of problems with experimental equipment and software; it was also applied for detector calibration and adjustment of experimental conditions.
[en] The local static spin susceptibility at neighbor sites from vacant Cu in the CuO2 plane was obtained. Calculations were performed using one of the variants of the memory function method. Charge-transfer and spin-flip correlation functions were expressed in the framework of the T-matrix formalism in terms of the corresponding Green functions for the ideal t-J model on the square lattice.
[en] A procedure for the evaluation of correlators of any order in a reasonable computer time is presented. Connection between correlators and fluctuations of the event mean values of observables is discussed. Extension of the procedure to event-by-event approach is suggested. The usefulness of the method is demonstrated using the events simulated within various models of multiparticle production.
[en] The problem of taking into account the Earth’s rotation in the search of the electric dipole moment of the neutron in experiments with ultracold neutrons and in the diffraction experiment is analyzed. For the precision reached up to the present moment in the diffraction experiment, the account of the Earth’s rotation yields a negligible (exactly calculated) correction. In experiments with ultracold neutrons, this correction exceeds the systematic error of measurement of the electric dipole moment of the neutron, and its exact calculation requires additional investigations. In this regard, further development of the diffraction method should considerably promote the progress in the search of the electric dipole moment of the neutron.
[en] In the present paper, we give some relationship between Lyapunov’s exponents and the recurrent neural network model described by the system of delay-differential equations. We investigate the dynamic properties of the specific class of nonlinear delay-differential equations by studying the asymptotic behavior of their solutions by means of Lyapunov’s exponents.
[en] The genetic algorithms (GAs) are applied to extract the values of parameters that describe the behavior of the asymmetric rotorlike fluorescence probes embedded in the uniaxially ordered system. The capabilities of the GA are enhanced by an application of a simple first order derivative search for the values of the multiplicative factors at each stage of the evolutionary run. The convergence is improved by the help of a gradient-expansion search performed after the GA is done. The potentiality of this approach demonstrates an example concerning the synthetic data set.