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Preprints and Communications

Here you can find JINR preprints and communications in pdf format starting from 1999.
File size is given in bytes in round brackets.

Subject Categories for JINR Publications Archive (1999 - 2016)


2017
2017-1 (1.257.218)
Brief Review of Topmost Scientific Results Obtained in 2016 at the Joint Institute for Nuclear Research

E2-2017-2 (182.901)
Tokarev M., Zborovský I.
Top-Quark ρT -Spectra at CMS and Flavor Independence of z-Scaling

We present new results of the analysis of top-quark differential cross sections obtained by the CMS Collaboration in ρρ collisions within the z-scaling approach. The spectra are measured over a wide range of collision energy √s=7, 8, 13 TeV and transverse momentum ρT = 30500 GeV/c of top-quark using leptonic and jet decay modes. Flavor independence of the scaling function ψ(z) is verified in the new kinematic range. The results of analysis of the top-quark spectra obtained at the LHC are compared with similar spectra measured in ρρ collisions at the Tevatron energy √s = 1,96 TeV. A tendency to saturation of ψ(z) for the process at low z and a power-law behavior of ψ(z) at high z is observed. The measurements of high ρT spectra of the top-quark production at the highest LHC energy is of interest for verification of self-similarity of particle production, understanding the flavor origin, and search for new physics symmetries with top-quark probe.

P2-2017-3 (337.191)
Dedovich T. G., Tokarev M. V.
Reconstruction of Fractals in the Presence of Background Events

Analysis of samples containing fractal and background events is performed using the method of systems of equations of P-adic coverages (SePaC) and Box Counting (BC) method. The features of these methods are studied. The procedures to indicate the existence of fractals in the combined sample, reconstruct fractals, estimate a fraction of fractals and estimate background in the extracted sample are suggested. The results of a comparative analysis of combined fractal samples using these methods are presented.

P13-2017-4 (519.460)
Pepelyshev Yu. N., Tsogtsaikhan Ts.
Investigation of the Dynamics of Pulse Energy Noise at the IBR-2M Reactor in the Fuel Burnup

In this paper, we present the results of a study on pulse energy noise dynamics of the IBR-2M in the fuel burnup for a significant period of the reactor operation, starting from the date of its commissioning in 2011 and until the end of 2016. It is shown that the pulse energy noise during operation of the IBR-2M with burnup to about ∼1100 MW·day changes significantly by both the spectral component and the level. The standard deviation of the random power fluctuations did not exceed 5% and was less than allowable. In addition, the low level of low-frequency noise (∼1,6%) indicates the absence of sign of vibrational instability of the reactor and a substantial margin of burnup until instability.

E19-2017-5 (386.497)
Koltovaya N. et al.
Kinetics of Gene and Chromosome Mutations Induced by UV-C in Yeast Saccharomyces cerevisiae

The systematic study of the kinetics of UV-induced gene and structural mutations in eukaryotic cells was carried out on the basis of model yeast S. cerevisiae. A variety of genetic assays (all types of base pair substitutions, frameshifts, forward mutations canl, chromosomal and plasmid rearrangements) in haploid strains were used. Yeast cells were treated by UV-C light of fluence of energy up to 200 J/m2. The kinetics of the induced gene and structural mutations is represented by a linear-quadratic and exponential functions. The slope of curves in log-log plots was not constant, had the value 2-4 and depended on the interval of doses. It was suggested that it is the superposition and dynamics of different pathways form the mutagenic responses of eukaryotic cells to UV-C light that cause the high-order curves.

P19-2017-11 (125.300)
Kiselev Yu.F.
Analytical Model of Active and Passive Transport in Biological Membranes

A formula is obtained for calculating the ion concentration profile in biological membranes. It is assumed that spherical ions move in an aqueous solution under the influence of an electric field and a concentration gradient. The friction force follows the Stokes law. The ions are covered with hydrate shells consisting of a dipole of water molecules which change their effective radius and friction. It is shown that if the friction force at the membrane inlet is stronger than at its outlet, then the ions can move by active transport. Analysis of the hydration allows the development of an analytical model of active and passive ion transport in membranes. The calculations are consistent with the concentration profile of Na+1, K+1 and Cl-1 measured in frog and squid cells.

E3-2017-12 (1.674.130)
Aksenov V. L.
A 15-year Forward Look at Neutron Facilities in JINR

The service life of the IBR-2 reactor, one of the leading pulse neutron sources in the world, is expected to end in 2032. Modern trends in sciences where neutrons are used, possible variants of a concept for a new neutron source and its potential position in the world neutron landscape are discussed. The flagship experiments for a new neutron source in the fields of condensed matter research, fundamental and nuclear physics are proposed.



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