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Search Results: 1 - 10 of 463456 matches for " Konstantin A. Gridnev "
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On The Hardening of The Spectrum of High-Energy Particles Formed in Heavy-Ion Collisions Considered within The Framework of The Hydrodynamic Approach  [PDF]
Alexander T. D’ yachenko, Konstantin A. Gridnev
Journal of Modern Physics (JMP) , 2011, DOI: 10.4236/jmp.2011.21003
Abstract: The emission of high-energy particles in 16O + 197Au collisions at energy 20 MeV / nucleon is considered within the framework of the time evolution of a hot spot taking into account the hydrodynamic compression and expansion stages. In addition, the evaporation of the particles that are formed in the early (hot) stage of the evolution of the hot spot is included in the calculation of the spectrum. This leads to a hardening of the particle spectrum in its high-energy part, which is in agreement with experimental data.
Nuclear interactions with modern three-body forces lead to the instability of neutron matter and neutron stars
Dmitry K. Gridnev,Stefan Schramm,Walter Greiner,Konstantin Gridnev
Physics , 2013, DOI: 10.1140/epja/i2014-14118-6
Abstract: It is shown that the neutron matter interacting through Argonne V18 pair-potential plus modern variants of Urbana or Illinois three-body forces is unstable. For the energy of $N$ neutrons $E(N)$, which interact through these forces, we prove mathematically that $E(N) = -cN^3 + \mathcal{O}(N^{8/3})$, where $c>0$ is a constant. This means that: (i) the energy per particle and neutron density diverge rapidly for large neutron numbers; (ii) bound states of $N$ neutrons exist for $N$ large enough. The neutron matter collapse is possible due to the form of the repulsive core in three-body forces, which vanishes when three nucleons occupy the same site in space. The old variant of the forces Urbana VI, where the phenomenological repulsive core does not vanish at the origin, resolves this problem. We prove that to prevent the collapse one should add a repulsive term to the Urbana IX potential, which should be larger than 50 MeV when 3 nucleons occupy the same spatial position.
Thermodynamic Properties of Li-LiH (LiD, LiT) Systems. The Phase Diagram  [PDF]
Konstantin A. Yakimovich, Tatiana Biryukova
Open Journal of Physical Chemistry (OJPC) , 2012, DOI: 10.4236/ojpc.2012.23019
Abstract: The paper presents a comprehensive critical review and detailed analysis of the literature, published in the field of the phase diagram solution Li-LiH (LiD, LiT). Special attention is paid to the completeness of the source information on the paper’s topic resulting in an extended reference list. Particularly, paper reviews rarely used sources including little-known publications from research centers, proceedings of the international scientific meetings and dissertations. These publications were more thoroughly analyzed in order to make the information available to the scientific society.
Chain configurations in light nuclei
S. Yu. Torilov,K. A. Gridnev
Physics , 2007, DOI: 10.1142/S0218301307006927
Abstract: The model of nuclear matter built from alpha-particles is proposed. The strong deformed shape for doubly even N=Z nuclides from carbon to magnesium has been determined according to this model. In this paper we undertake very simple approach, which assumes the existence of low lying chain configurations.
Nuclear Model of Binding alpha-particles
K. A. Gridnev,S. Yu. Torilov,V. G. Kartavenko,W. Greiner,D. K. Gridnev,J. Hamilton
Physics , 2004,
Abstract: The model of binding alpha-particles in nuclei is suggested. It is shown good (with the accuracy of 1-2%) description of the experimental binding energies in light and medium nuclear systems. Our preliminary calculations show enhancement of the binding energy for super heavy nuclei with Z~120.
A Novel Method of Fruit Raw Material Reprocessing  [PDF]
Alexander A. Emelyanov, Konstantin A. Emelyanov
Engineering (ENG) , 2010, DOI: 10.4236/eng.2010.212122
Abstract: We introduced a method of deep resources-economy reprocessing of fruit raw material. Based on the raw material fractionation at decreased temperatures the method results in the production of bioactive food stuffs, which are dry juice and refuse and natural water. The method includes the production of directly extracted juice and pulp refuse, juice evaporation in vacuum with the production of concentrate and natural water, and air drying the concentrate and the refuse. The method is realized for garden strawberry and cucurbit pulp. The mass concentration of solid in the fractions of cucurbit pulp is defined and the specific weight of the fractions are defined. It is shown that the solid of the cucurbit pulp is uniformly allocated between the fractions and amounts 34% for the dry juice, 31% for the dry refuse, and 35% for the natural water. Food and biological values of the cucurbit pulp fractions are determined. It is determined that the cucurbit includes silicium, nickel, and chromium. Silicium is contained only in dry fractions; nickel is present everywhere; chromium is discovered only in the natural water. Food and biological values of the cucurbit pulp are defined and their allocation between the fractions is determined. Separate components concentrations of the solid considerably differ between the fractions. Thus, two thirds of pulp protein is concentrated in the dry juice and a third is concentrated in the refuse. The natural water contains up to 90% of fat and sugar, from a half to two thirds of B-group vitamins, and the bulk of the mineral substances (K, Na, Ca, Mg, S, Co, Cu, Ni, Cr, and Zn), which concentration composes from 73% for potassium up to 100% for chromium.
Spectral Functions and Properties of Nuclear Matter
V. A. Danilenko,K. A. Gridnev,A. S. Kondratyev
International Journal of Statistical Mechanics , 2013, DOI: 10.1155/2013/317491
Abstract: The Green’s function method in the Kadanoff-Baym version provides a basic theory for nuclear dynamics which is applicable also to nonzero temperature and to nonequilibrium systems. At the same time, it maintains the basic many-body techniques of the Brueckner theory that makes reasonable a comparison of the numerical results of the two methods for equilibrium systems. The correct approximation to the spectral function which takes into account the widths of energy levels is offered and discussed, and the comparison of the values of binding energy in the two methods is produced. 1. Introduction The only microscopic theory which is capable of describing dynamical and statistical properties of quantum many-body systems in a comprehensive way is the Green’s function approach initiated by Martin and Schwinger and later developed by Kadanoff and Baym [1, 2] with specific application to nuclear matter in [3–6]. Traditional many-body theories of nuclei such as Brueckner’s are based on a quasiparticle picture ab initio neglecting the widths of the energy levels associated with the strong interactions when calculating the binding energy. In its original form, the Brueckner theory only considers particle propagation in intermediate states by defining a two-body reaction matrix of “effective” interaction or similarly defined objects [3]. Different approximations to the spectral functions in the Kadanoff-Baym method established a link between the Brueckner and the Green’s function theories [3–6]. Similar approximations to the spectral functions and kinetic equations were considered also in [7–9]. Unfortunately, all the approximations offered in [3–9] turned to be unsatisfactory as it was shown in [10]. The purpose of this paper is to generalize the results of [10] concerning the spectral function and to clarify some of the quantitative relations between the two methods in nuclear physics on the basis of these results. We show that the self-consistent approximations in the two theories lead to very close results, although numerical calculations of the binding energy are still limited by our limited knowledge of nuclear forces and many-body effects. 2. Spectral Functions of the Particle and Quasiparticle States in the Kadanoff-Baym Approach The KB formalism results in the following general expression for a one-particle spectral function for a system in equilibrium state [1, 2, 10]: where and is a one-particle energy in the Hartree-Fock approximation. Real and imaginary parts of the correlation self-energy function are related through the Hilbert transform Here, refers
Analysis of Nonlinear Stochastic Systems with Jumps Generated by Erlang Flow of Events  [PDF]
Alexander S. Kozhevnikov, Konstantin A. Rybakov
Open Journal of Applied Sciences (OJAppS) , 2013, DOI: 10.4236/ojapps.2013.31001

In this paper we consider the stochastic systems with jumps (random impulses) generated by Erlang flow of events that lead to discontinuities in paths. These systems may be used in various applications such as a control of complex technical systems, financial mathematics, mathematical biology and medicine. We propose to use a spectral method formalism to the probabilistic analysis problem for the stochastic systems with jumps. This method allows to get a solution of the analysis problem in an explicit form.

Screening Breakdown for Finite-Range Gravitational Field and the Motion of Galaxies in the Local Group  [PDF]
Yuri V. Chugreev, Konstantin A. Modestov
International Journal of Astronomy and Astrophysics (IJAA) , 2016, DOI: 10.4236/ijaa.2016.62012
Abstract: The lack of Birkhoff theorem in finite-range gravitation reveals nonzero acceleration of the test body inside the massive spherical shell, as well as breakdown of screening inside the charged conductor gives rise to acceleration of the test charge. An application of this effect to the motion of galaxies in Local Group allows to constraint quintessence parameter in some massive gravitational theories.
Reasons for the Wide Spread of the Protosyllable -*kam- (and Its Phonetic Variants -*kham-, -*cham-) in the Modern Place-Names (Multidisciplinary Approach)  [PDF]
Elena A. Mironova, Konstantin N. Shkvarya
Advances in Anthropology (AA) , 2018, DOI: 10.4236/aa.2018.84011
Abstract: This article presents a new approach in the field of protolanguage study on the basis of the hypothesis (Mironova, 2008) about protosyllables of protolanguage preserved in the modern place names. The protosyllable -*kam- exists since ancient times in hydronyms and oronyms, and shows the presence of common ancient meaning in their phonetic arrangement. The research reveals this common meaning inserted in the protosyllable -*kam-, which reflects the attitude of migrated tribes to the sacred mountains and mountain ranges on the one hand and water sources on the other. The traces of these migrated tribes can be found according to the up-to-date investigations in the field of archaeology (stone artifacts in the shape of a bear and an elk), in the field of DNA-genealogy (the data about “Malta boy” Y-chromosome haplogroup R) and in the field of the Paleolithic religious cult study (common features of the united religious cult of the Great Goddess of the Paleolithic in Eurasia, including: heart-like and anthropomorphic images on the surfaces and on the corners of the stones, boulders and cliffs).
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