2,088 research outputs found

    Theory of Quark-Gluon Plasma and Phase Transition

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    Nonperturbative picture of strong interacting quark-gluon plasma is given based on the systematic Field Correlator Method. Equation of state, phase transition in density-temperature plane is derived and compared to lattice data as well as subsequent thermodynamical quantities of QGP.Comment: 6 pages,5 figures; talk given at "13th Lomonosov Conference on Elementary Particle Physics", Moscow, August 23 -- 29, 2007; new reference adde

    On integration of the Kowalevski gyrostat and the Clebsch problems

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    For the Kowalevski gyrostat change of variables similar to that of the Kowalevski top is done. We establish one to one correspondence between the Kowalevski gyrostat and the Clebsch system and demonstrate that Kowalevski variables for the gyrostat practically coincide with elliptic coordinates on sphere for the Clebsch case. Equivalence of considered integrable systems allows to construct two Lax matrices for the gyrostat using known rational and elliptic Lax matrices for the Clebsch model. Associated with these matrices solutions of the Clebsch system and, therefore, of the Kowalevski gyrostat problem are discussed. The Kotter solution of the Clebsch system in modern notation is presented in detail.Comment: LaTeX, 24 page

    Intelligent OFDM telecommunication system. Part 3. Anti-eavesdropping and anti-jamming properties of system, based on many-parameter wavelet and Golay transforms

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    In this paper, we aim to investigate the superiority and practicability of many-parameter Fourier transforms (MPFT) from the physical layer security (PHY-LS) perspective. We propose novel Intelligent OFDM-telecommunication system (Intelligent-OFDM-TCS), based on MPFT. New system uses inverse MPFT for modulation at the transmitter and direct MPFT for demodulation at the receiver. The purpose of employing the MPFTs is to improve the PHY-LS of wireless transmissions against to the wide-band anti-jamming communication. Each MPFT depends on finite set of independent parameters (angles), which could be changed independently one from another. When parameters are changed, multi-parametric transform is also changed taking form of a set known (and unknown) orthogonal (or unitary) transforms. We implement the following performances as bit error rate (BER), symbol error rate (SER), the Shannon-Wyner secrecy capacity (SWSC) for novel Intelligent-MPWT-OFDM-TCS. Previous research has shown that the conventional OFDM TCS based on discrete Fourier transform (DFT) has unsatisfactory characteristics in BER, SWSC and in anti-eavesdropping communications. We study Intelligent-MPWT-OFDM-TCS to find out optimal values of angle parameters of MPFT optimized BER, SWSC, anti-eavesdropping effects. Simulation results show that the proposed Intelligent OFDM-TCS have better performances than the conventional OFDM system based on DFT against eavesdropping. Β© 2019 IOP Publishing Ltd. All rights reserved

    Many factor mimo-filters

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    Π˜ΡΡΠ»Π΅Π΄ΡƒΠ΅Ρ‚ΡΡ ΡΡ„Ρ„Π΅ΠΊΡ‚ΠΈΠ²Π½ΠΎΡΡ‚ΡŒ ΠΌΠΎΠ΄ΠΈΡ„ΠΈΡ†ΠΈΡ€ΠΎΠ²Π°Π½Π½Ρ‹Ρ… ΠΌΠ½ΠΎΠ³ΠΎΡ„Π°ΠΊΡ‚ΠΎΡ€Π½Ρ‹Ρ… (Π±ΠΈ-, Ρ‚Ρ€ΠΈ- ΠΈ Ρ‡Π΅Ρ‚Ρ‹Ρ€Π΅Ρ…-Π»Π°Ρ‚Π΅Ρ€Π°Π»ΡŒΠ½Ρ‹Ρ…) MIMO-Ρ„ΠΈΠ»ΡŒΡ‚Ρ€ΠΎΠ² для сСрых, Ρ†Π²Π΅Ρ‚Π½Ρ‹Ρ… ΠΈ Π³ΠΈΠΏΠ΅Ρ€ΡΠΏΠ΅ΠΊΡ‚Ρ€Π°Π»ΡŒΠ½Ρ‹Ρ… ΠΈΠ·ΠΎΠ±Ρ€Π°ΠΆΠ΅Π½ΠΈΠΉ. ΠžΠ±Ρ‹Ρ‡Π½Ρ‹Π΅ Π±ΠΈΠ»Π°Ρ‚Π΅Ρ€Π°Π»ΡŒΠ½Ρ‹Π΅ Ρ„ΠΈΠ»ΡŒΡ‚Ρ€Ρ‹ ΠΎΡΡƒΡ‰Π΅ΡΡ‚Π²Π»ΡΡŽΡ‚ взвСшСнноС усрСднСниС сосСдних пиксСлСй. ВСса Π²ΠΊΠ»ΡŽΡ‡Π°ΡŽΡ‚ Π΄Π²Π΅ ΠΊΠΎΠΌΠΏΠΎΠ½Π΅Π½Ρ‚Ρ‹: ΠΏΡ€ΠΎΡΡ‚Ρ€Π°Π½ΡΡ‚Π²Π΅Π½Π½ΡƒΡŽ ΠΈ Ρ€Π°Π΄ΠΈΠΎΠΌΠ΅Ρ‚Ρ€ΠΈΡ‡Π΅ΡΠΊΡƒΡŽ. ΠŸΠ΅Ρ€Π²Π°Ρ ΠΊΠΎΠΌΠΏΠΎΠ½Π΅Π½Ρ‚Π° ΡƒΡ‡ΠΈΡ‚Ρ‹Π²Π°Π΅Ρ‚ гСомСтричСскоС расстояниС ΠΌΠ΅ΠΆΠ΄Ρƒ Ρ†Π΅Π½Ρ‚Ρ€Π°Π»ΡŒΠ½Ρ‹ΠΌ пиксСлСм маски ΠΈ Π΅Π³ΠΎ Π»ΠΎΠΊΠ°Π»ΡŒΠ½Ρ‹ΠΌΠΈ сосСдями. Π’Ρ‚ΠΎΡ€ΠΎΠΉ ΠΊΠΎΠΌΠΏΠΎΠ½Π΅Π½Ρ‚ ΡƒΡ‡ΠΈΡ‚Ρ‹Π²Π°Π΅Ρ‚ радиомСтричСскоС расстояниС ΠΌΠ΅ΠΆΠ΄Ρƒ Ρ†Π΅Π½Ρ‚Ρ€Π°Π»ΡŒΠ½Ρ‹ΠΌ пиксСлСм маски ΠΈ Π΅Π³ΠΎ Π»ΠΎΠΊΠ°Π»ΡŒΠ½Ρ‹ΠΌΠΈ сосСдями. Π’ этом классичСском Π°Π»Π³ΠΎΡ€ΠΈΡ‚ΠΌΠ΅ Ρ†Π΅Π½Ρ‚Ρ€Π°Π»ΡŒΠ½Ρ‹ΠΉ пиксСль маски ΠΈΠ³Ρ€Π°Π΅Ρ‚ ΠΎΠΏΡ€Π΅Π΄Π΅Π»ΡΡŽΡ‰ΡƒΡŽ Ρ€ΠΎΠ»ΡŒ Π² ΠΊΠΎΠ½Π΅Ρ‡Π½ΠΎΠΌ Ρ€Π΅Π·ΡƒΠ»ΡŒΡ‚Π°Ρ‚Π΅ Ρ„ΠΈΠ»ΡŒΡ‚Ρ€Π°Ρ†ΠΈΠΈ. Если ΠΎΠ½ искаТСн, Ρ‚ΠΎ ΠΈ Ρ€Π΅Π·ΡƒΠ»ΡŒΡ‚Π°Ρ‚ Ρ„ΠΈΠ»ΡŒΡ‚Ρ€Π°Ρ†ΠΈΠΈ Π±ΡƒΠ΄Π΅Ρ‚ искаТСнным. Π­Ρ‚ΠΎΡ‚ Ρ„Π°ΠΊΡ‚ опрСдСляСт ΠΏΠ΅Ρ€Π²ΡƒΡŽ ΠΌΠΎΠ΄ΠΈΡ„ΠΈΠΊΠ°Ρ†ΠΈΡŽ: Ρ†Π΅Π½Ρ‚Ρ€Π°Π»ΡŒΠ½Ρ‹ΠΉ пиксСль замСняСтся Π΅Π³ΠΎ любой сглаТСнной вСрсиСй, ΠΏΠΎΠ»ΡƒΡ‡Π΅Π½Π½ΠΎΠΉ Π½Π° основС сосСдних пиксСлСй. Вторая модификация ΠΈΡΠΏΠΎΠ»ΡŒΠ·ΡƒΠ΅Ρ‚ ΠΌΠ°Ρ‚Ρ€ΠΈΡ‡Π½ΠΎ-Π·Π½Π°Ρ‡Π½Ρ‹Π΅ вСса. Они Π²ΠΊΠ»ΡŽΡ‡Π°ΡŽΡ‚ Ρ‡Π΅Ρ‚Ρ‹Ρ€Π΅ ΠΊΠΎΠΌΠΏΠΎΠ½Π΅Π½Ρ‚Ρ‹: ΠΏΡ€ΠΎΡΡ‚Ρ€Π°Π½ΡΡ‚Π²Π΅Π½Π½ΡƒΡŽ, Ρ€Π°Π΄ΠΈΠΎΠΌΠ΅Ρ‚Ρ€ΠΈΡ‡Π΅ΡΠΊΡƒΡŽ, ΠΌΠ΅ΠΆΠΊΠ°Π½Π°Π»ΡŒΠ½ΡƒΡŽ ΠΈ Ρ€Π°Π΄ΠΈΠΎΠΌΠ΅Ρ‚Ρ€ΠΈΡ‡Π΅ΡΠΊΡƒΡŽ ΠΌΠ΅ΠΆΠΊΠ°Π½Π°Π»ΡŒΠ½ΡƒΡŽ. Π§Π΅Ρ‚Π²Π΅Ρ€Ρ‚Ρ‹ΠΉ вСс ΡƒΡ‡ΠΈΡ‚Ρ‹Π²Π°Π΅Ρ‚ радиомСтричСскоС расстояниС ΠΌΠ΅ΠΆΠ΄Ρƒ Ρ†Π΅Π½Ρ‚Ρ€Π°Π»ΡŒΠ½Ρ‹ΠΌ пиксСлСм ΠΈ ΠΌΠ΅ΠΆΠΊΠ°Π½Π°Π»ΡŒΠ½Ρ‹ΠΌΠΈ сосСдними пиксСлями

    FrΓ©chet mimo-filters

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    МСдианная Ρ„ΠΈΠ»ΡŒΡ‚Ρ€Π°Ρ†ΠΈΡ ΠΏΠΎΠ»ΡƒΡ‡ΠΈΠ»Π° ΡˆΠΈΡ€ΠΎΠΊΠΎΠ΅ распространСниС ΠΏΡ€ΠΈ ΠΎΠ±Ρ€Π°Π±ΠΎΡ‚ΠΊΠ΅ скалярных ΠΈΠ·ΠΎΠ±Ρ€Π°ΠΆΠ΅Π½ΠΈΠΉ Π² качСствС ΠΌΠ΅Ρ‚ΠΎΠ΄ΠΎΠ² Ρ„ΠΈΠ»ΡŒΡ‚Ρ€Π°Ρ†ΠΈΠΈ, ΡΠΎΡ…Ρ€Π°Π½ΡΡŽΡ‰ΠΈΡ… ΠΏΠ΅Ρ€Π΅ΠΏΠ°Π΄Ρ‹ яркости. Главная идСя ΠΌΠ΅Π΄ΠΈΠ°Π½Π½ΠΎΠΉ Ρ„ΠΈΠ»ΡŒΡ‚Ρ€Π°Ρ†ΠΈΠΈ состоит Π² Ρ‚ΠΎΠΌ, Ρ‡Ρ‚ΠΎ Ρ†Π΅Π½Ρ‚Ρ€Π°Π»ΡŒΠ½Ρ‹ΠΉ пиксСль ΡΠΊΠ°Π½ΠΈΡ€ΡƒΡŽΡ‰Π΅ΠΉ маски замСняСтся ΠΌΠ΅Π΄ΠΈΠ°Π½ΠΎΠΉ всСх пиксСлСй, содСрТащихся Π² маскС. Π’ этой Ρ€Π°Π±ΠΎΡ‚Π΅ идСя Ρ€Π°ΡΡˆΠΈΡ€ΡΠ΅Ρ‚ΡΡ Π½Π° Π²Π΅ΠΊΡ‚ΠΎΡ€Π½ΠΎ-Π·Π½Π°Ρ‡Π½Ρ‹Π΅ изобраТСния. Π Π°ΡΡˆΠΈΡ€Π΅Π½ΠΈΠ΅ основываСтся Π½Π° Ρ‚ΠΎΠΌ Ρ„Π°ΠΊΡ‚Π΅, Ρ‡Ρ‚ΠΎ ΠΌΠ΅Π΄ΠΈΠ°Π½Π° являСтся Ρ‚Π°ΠΊΠΆΠ΅ Ρ‚ΠΎΡ‡ΠΊΠΎΠΉ, которая ΠΌΠΈΠ½ΠΈΠΌΠΈΠ·ΠΈΡ€ΡƒΠ΅Ρ‚ сумму расстояний ΠΌΠ΅ΠΆΠ΄Ρƒ Π½Π΅ΠΉ ΠΈ всСми скалярными пиксСлями Π²Π½ΡƒΡ‚Ρ€ΠΈ маски. Π’ΠΎΡ‡ΠΊΠΎΠΉ Π€Ρ€Π΅ΡˆΠ΅ ΠΊΠΎΠ½Π΅Ρ‡Π½ΠΎΠ³ΠΎ мноТСства Π²Π΅ΠΊΡ‚ΠΎΡ€Π½ΠΎ-Π·Π½Π°Ρ‡Π½Ρ‹Ρ… пиксСлСй Π² Π½Π΅ΠΊΠΎΡ‚ΠΎΡ€ΠΎΠΌ мСтричСском пространствС (с Π·Π°Π΄Π°Π½Π½ΠΎΠΉ ΠΌΠ΅Ρ‚Ρ€ΠΈΠΊΠΎΠΉ) являСтся Ρ‚Π°ΠΊΠΎΠΉ Π²Π΅ΠΊΡ‚ΠΎΡ€, сумма расстояний Π΄ΠΎ ΠΊΠΎΡ‚ΠΎΡ€ΠΎΠ³ΠΎ ΠΎΡ‚ всСх Π²Π΅ΠΊΡ‚ΠΎΡ€Π½Ρ‹Ρ… пиксСлСй (находящихся Π²Π½ΡƒΡ‚Ρ€ΠΈ маски) ΠΈΠΌΠ΅Π΅Ρ‚ минимальноС Π·Π½Π°Ρ‡Π΅Π½ΠΈΠ΅. Π’ Π΄Π°Π½Π½ΠΎΠΉ ΡΡ‚Π°Ρ‚ΡŒΠ΅ понятиС Ρ‚ΠΎΡ‡ΠΊΠΈ Π€Ρ€Π΅ΡˆΠ΅ Ρ€Π°ΡΡˆΠΈΡ€ΡΠ΅Ρ‚ΡΡ Π΄ΠΎ ΠΎΠ±ΠΎΠ±Ρ‰Π΅Π½Π½ΠΎΠΉ ΠΌΠ΅Π΄ΠΈΠ°Π½Ρ‹ Π€Ρ€Π΅ΡˆΠ΅, Π² ΠΊΠΎΡ‚ΠΎΡ€ΠΎΠΉ ΠΈΡΠΏΠΎΠ»ΡŒΠ·ΡƒΠ΅Ρ‚ΡΡ агрСгация расстояний, Π° Π½Π΅ ΠΈΡ… сумма. Π‘ΠΎΠ»Π΅Π΅ Ρ‚ΠΎΠ³ΠΎ, ΠΏΡ€ΠΈ ΠΎΠ±ΠΎΠ±Ρ‰Π΅Π½ΠΈΠΈ ΠΈΡΠΏΠΎΠ»ΡŒΠ·ΡƒΡŽΡ‚ΡΡ Π½Π΅ классичСскиС расстояния, Π° ΠΈΡ… Π°Π³Ρ€Π΅Π³Π°Ρ†ΠΈΠΎΠ½Π½Ρ‹Π΅ обобщСния. ΠžΠ±ΠΎΠ±Ρ‰Π΅Π½Π½Ρ‹Π΅ ΠΌΠ΅Π΄ΠΈΠ°Π½Ρ‹ Π€Ρ€Π΅ΡˆΠ΅ ΠΈΡΠΏΠΎΠ»ΡŒΠ·ΡƒΡŽΡ‚ΡΡ для построСния Π½ΠΎΠ²Ρ‹Ρ… ΠΌΠ΅Π΄ΠΈΠ°Π½Π½Ρ‹Ρ… MIMO-Ρ„ΠΈΠ»ΡŒΡ‚Ρ€ΠΎΠ²

    Multiparametric wavelet transforms

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    The main goal of the paper is to show that wavelet transforms and packets have the multiparametric representation in the form of a product of the rotation Jacobi matrices. These representations we call the third and the fourth canonical multiparametric form. Each multiparametric wavelet transform (MPWT) depends on several free Jacobi parameters. When parameters are changed multiparametric transform is changed too taking form of all known and unknown orthogonal wavelet transforms. It gives unified approach to describing a wide set of cyclic orthogonal wavelet transforms and endows with adaptive properties of those transforms.Главная Ρ†Π΅Π»ΡŒ ΡΡ‚Π°Ρ‚ΡŒΠΈ β€” Π²Ρ‹Π²ΠΎΠ΄ ΠΏΡ€ΠΈΠ½Ρ†ΠΈΠΏΠΈΠ°Π»ΡŒΠ½ΠΎ Π½ΠΎΠ²ΠΎΠ³ΠΎ прСдставлСния быстрых цикличСских Π²Π΅ΠΉΠ²Π»Π΅Ρ‚-ΠΏΡ€Π΅ΠΎΠ±Ρ€Π°Π·ΠΎΠ²Π°Π½ΠΈΠΉ Π² Π²ΠΈΠ΄Π΅ произвСдСния слабозаполнСнных ΠΌΠ°Ρ‚Ρ€ΠΈΡ† вращСния, зависящих ΠΎΡ‚ ΠΊΠΎΠ½Π΅Ρ‡Π½ΠΎΠ³ΠΎ числа свободных ΠΏΠ°Ρ€Π°ΠΌΠ΅Ρ‚Ρ€ΠΎΠ². ΠŸΡ€ΠΈ ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΠΈ ΠΏΠ°Ρ€Π°ΠΌΠ΅Ρ‚Ρ€ΠΎΠ² мСняСтся Π²ΠΈΠ΄ прСобразования, принимая ΠΎΠ±Π»ΠΈΠΊ ΠΊΠ°ΠΊ всСх извСстных, Ρ‚Π°ΠΊ ΠΈ нСизвСстных Π² настоящСС врСмя Π²Π΅ΠΉΠ²Π»Π΅Ρ‚-ΠΏΡ€Π΅ΠΎΠ±Ρ€Π°Π·ΠΎΠ²Π°Π½ΠΈΠΉ ΠΈ Π²Π΅ΠΉΠ²Π»Π΅Ρ‚-ΠΏΠ°ΠΊΠ΅Ρ‚ΠΎΠ², Ρ‡Ρ‚ΠΎ Π΄Π°Π΅Ρ‚ ΠΏΡ€Π°ΠΊΡ‚ΠΈΡ‡Π΅ΡΠΊΡƒΡŽ основу для ΠΈΡ… ΡƒΠ½ΠΈΡ„ΠΈΡ†ΠΈΡ€ΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ описания

    On integrable system on S2S^2 with the second integral quartic in the momenta

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    We consider integrable system on the sphere S2S^2 with an additional integral of fourth order in the momenta. At the special values of parameters this system coincides with the Kowalevski-Goryachev-Chaplygin system.Comment: LaTeX, 6 page

    Operator method in solving non-linear equations of the Hartree-Fock type

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    The operator method is used to construct the solutions of the problem of the polaron in the strong coupling limit and of the helium atom on the basis of the Hartree-Fock equation. E0=βˆ’0.1085128052Ξ±2E_0=-0.1085128052\alpha^2 is obtained for the polaron ground-state energy. Energies for 2s- and 3s-states are also calculated. The other excited states are briefly discussed.Comment: 7 page

    Total spectrum of photon emission by an ultra-relativistic positron channeling in a periodically bent crystal

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    We present the results of numerical calculations of the channelling and undulator radiation generated by an ultra-relativistic positron channelling along a crystal plane, which is periodically bent. The bending might be due either to the propagation of a transverse acoustic wave through the crystal, or due to the static strain as it occurs in superlattices. The periodically bent crystal serves as an undulator. We investigate the dependence of the intensities of both the ordinary channelling and the undulator radiations on the parameters of the periodically bent channel with simultaneous account for the dechannelling effect of the positrons. We demonstrate that there is a range of parameters in which the undulator radiation dominates over the channelling one and the characteristic frequencies of both types of radiation are well separated. This result is important, because the undulator radiation can be used to create a tunable source of X-ray and gamma-radiation.Comment: published in J. Phys. G: Nucl. Part. Phys. 26 (2000) L87-L95, http://www.iop.org ; 12 pages, 4 figures, LaTe
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