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Search Results: 1 - 10 of 539533 matches for " A. V. Vasiliev "
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Universal threshold for single-spin asymmetries in fixed target experiments
V. V. Mochalov,A. N. Vasiliev
Physics , 2003,
Abstract: The analysis of inclusive $\pi$-meson single spin asymmetry measurements was done. It was found that the single spin asymmetry starts to grow up at the same value of the $\pi$-meson energy in the center of mass system for fixed target experiments at the beam energy range from 13 to 200 GeV.
Computer-Aided Design of X-Ray Microtomographic Scanners  [PDF]
V. I. Syryamkin, E. N. Bogomolov, V. V. Brazovsky, A. Sh. Bureev, G. S. Glushkov, A. V. Vasiliev
Advances in Computed Tomography (ACT) , 2013, DOI: 10.4236/act.2013.23015

The article is to study the development of computer-aided design of X-ray microtomographythe device for investigating the structure and construction of three-dimensional images of organic and inorganic objects on the basis of shadow projections. This article provides basic information regarding CAD of X-ray microtomography and a scheme consisting of three levels. The article also shows basic relations of X-ray computed tomography, the generalized scheme of an X-ray microtomographic scanner. The methods of X-ray imaging of the spatial microstructure and morphometry of materials are described. The main characteristics of an X-ray microtomographic scanner, the X-ray source, X-ray optical elements and mechanical components of the positioning system are shown. The block scheme and software functional scheme for intelligent neural network system of analysis of the internal microstructure of objects are presented. The method of choice of design parameters of CAD of X-ray microtomography aims at improving the quality of design and reducing costs of it. It is supposed to reduce the design time and eliminate the growing number of engineers involved in development and construction of X-ray microtomographic scanners.

The ~ 2400-year cycle in atmospheric radiocarbon concentration: bispectrum of 14C data over the last 8000 years
S. S. Vasiliev,V. A. Dergachev
Annales Geophysicae (ANGEO) , 2003,
Abstract: We have carried out power spectrum, time-spectrum and bispectrum analyses of the long-term series of the radiocarbon concentrations deduced from measurements of the radiocarbon content in tree rings for the last 8000 years. Classical harmonic analysis of this time series shows a number of periods: 2400, 940, 710, 570, 500, 420, 360, 230, 210 and 190 years. A principle feature of the time series is the long period of ~ 2400 years, which is well known. The lines with periods of 710, 420 and 210 years are found to be the primary secular components of power spectrum. The complicated structure of the observed power spectrum is the result of ~ 2400-year modulation of primary secular components. The modulation induces the appearance of two side lines for every primary one, namely lines with periods of 940 and 570 years, of 500 and 360 years, and 230 and 190 years. The bispectral analysis shows that the parameters of carbon exchange system varied with the ~ 2400-year period during the last 8000 years. Variations of these parameters appear to be a climate effect on the rate of transfer of 14C between the atmosphere and the the ocean. Key words. Meteorology and atmospheric dynamics (climatology; ocean-atmosphere interaction; paleoclimatology)
Presence of the Universal Substructures in the Hadrons -- Constituent Quarks
V. Mochalov,S. Troshin,A. N. Vasiliev
Physics , 2003,
Abstract: The universality of single-spin asymmetry on inclusive $\pi$-meson production is discussed. This universality can be related to the hadron substructure -- constituent quarks in the frame of the quark model for U-matrix.
Free Field Dynamics in the Generalized AdS (Super)Space
V. E. Didenko,M. A. Vasiliev
Mathematics , 2003, DOI: 10.1063/1.1633022
Abstract: Pure gauge representation for general vacuum background fields (Cartan forms) in the generalized $AdS$ superspace identified with $OSp(L,M)$ is found. This allows us to formulate dynamics of free massless fields in the generalized $AdS$ space-time and to find their (generalized) conformal and higher spin field transformation laws. Generic solution of the field equations is also constructed explicitly. The results are obtained with the aid of the star product realization of ortosymplectic superalgebras.
Scalar Field in Any Dimension from the Higher Spin Gauge Theory Perspective
O. V. Shaynkman,M. A. Vasiliev
Mathematics , 2000,
Abstract: We formulate the equations of motion of a free scalar field in the flat and $AdS$ space of an arbitrary dimension in the form of some "higher spin" covariant constancy conditions. Klein-Gordon equation is interpreted as a non-trivial cohomology of a certain "\sgm-complex". The action principle for a scalar field is formulated in terms of the "higher-spin" covariant derivatives for an arbitrary mass in $AdS_d$ and for a non-zero mass in the flat space. The constructed action is shown to be equivalent to the standard first-order Klein-Gordon action at the quadratic level but becomes different at the interaction level because of the presence of an infinite set of auxiliary fields which do not contribute at the free level. The example of Yang-Mills current interaction is considered in some detail. It is shown in particular how the proposed action generates the pseudolocally exact form of the matter currents in $AdS_d$.
Higher Spin Conformal Symmetry for Matter Fields in 2+1 Dimensions
O. V. Shaynkman,M. A. Vasiliev
Mathematics , 2001,
Abstract: A simple realization of the conformal higher spin symmetry on the free $3d$ massless matter fields is given in terms of an auxiliary Fock module both in the flat and $AdS_3$ case. The duality between non-unitary field-theoretical representations of the conformal algebra and the unitary (singleton--type) representations of the $3d$ conformal algebra $sp(4,\R)$ is formulated explicitly in terms of a certain Bogolyubov transform.
About Nature of Nuclear Forces  [PDF]
Boris V. Vasiliev
Journal of Modern Physics (JMP) , 2015, DOI: 10.4236/jmp.2015.65071
Abstract: A new approach to the problem of nuclear force nature is considered. It is shown that an attraction in the proton-neutron pair can occur due to the exchange of relativistic electron. The estimation of the energy of this exchange is in good agreement with the experimental value of the deuteron binding energy. At that, neutron is regarded as a composite corpuscule consisting of proton and relativistic electron that allows predicting the neutron magnetic moment and the energy of its decay.
The Magnetic Field of Earth and Other Celestial Bodies  [PDF]
Boris V. Vasiliev
International Journal of Geosciences (IJG) , 2015, DOI: 10.4236/ijg.2015.611097
Abstract: Majority of models of terrestrial magnetism try to explain why the main magnetic field of the Earth near the poles is of the order of 1 Oe. Such statement of the basic problem of terrestrial magnetism models nowadays is unacceptable. Space flights and the development of astronomy show a remarkable and earlier unknown fact that magnetic moments of all planets of Solar system, as well as some their satellites and a number of stars are proportional to their angular momenta. Therefore, this geophysical problem turned into a special case of the more general problem of magnetism of cosmic bodies. This fact makes it necessary to reformulate the main task of the model of terrestrial magnetism and the Earth as a whole. It should explain, first, why the magnetic moment of the Earth, as well as of other space bodies, is proportional to its angular momentum and, second, why the proportionality coefficient is close to the ratio of world constants—toG1/2/c. This fact requires a rethinking in the constructing of a model of the internal structure of the Earth and the reformulation of the main objectives of terrestrial magnetism, whereas it is necessary to explain why the ratio of the magnetic moment of the Earth to its torque, as well as for other celestial bodies, is close to the ratio of universal constantsG1/2/c. In the discussed theory it is shown that one can see that it is energetically favorable for hot stars to have its core consisting from dense electron-nuclear plasma with constant density and temperature. It is shown that as for the Earth it is energetically favorable to have its core consisting from dense electron-ion plasma. Importantly, all calculated parameters are in an agreement with measurement results.
Some Problems of Elementary Particles Physics and Gilbert’s Postulate  [PDF]
Boris V. Vasiliev
Journal of Modern Physics (JMP) , 2016, DOI: 10.4236/jmp.2016.714166
Abstract: William Gilbert formulated over 400 years ago a postulate that can be considered as the main principle of modern natural sciences [1]: All theoretical constructs that claim to be scientific must be verified and confirmed experimentally. Despite of past centuries, this principle has not lost its relevance today. In the modern physics there are some conventional theories, which do not satisfy to Gilbert’s postulate [2]. In physics of microcosm there are models which cannot be compared with the measurement data as they do not allow to calculate the basic characteristic parameters (such as masses or magnetic moments) of elementary particles. In this article an alternative approach to these problems is considered. It is shown that an attraction in the proton-neutron pair can occur due to the exchange of relativistic electron. The estimation of this exchange energy is in agreement with the experimental values of the binding energy of some light nuclei. At that neutron is regarded as a composite corpuscule consisting of proton and relativistic electron that allows predicting the neutron magnetic moment, its mass and energy of its decay. It is shown that the standard Maxwell’s theory of electromagnetic field describes a possibility to initiate in free space (in empty ether) a magnetic ϒ-quantum (a splash of magnetic field), devoid of the electric component and having spin \"\". Since magnetic monopoles do not exist, a characteristic feature of the magnetic ϒ-quantum is the weakness of its interaction with matter, which is many orders of magnitude smaller than that of the electromagnetic wave. These properties suggest that the magnetic ϒ-quantum can be identified with neutrinos. On this basis, we get a fresh look on the nature of π-me-sons and μ-mesons and calculate their masses.
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