805 research outputs found
Fifty years of the Glauber diffraction theory
In this minireview a historical excursus in theoretical studies related to
the Glauber diffraction theory has been presented with an accent on the recent
developments in this subject.Comment: 22 pages, 4 figures, in russian;v2: an atempt to improve hyphenatio
The new ultra high-speed all-optical coherent streak-camera
In the present paper a new type of ultra high-speed all-optical coherent streak-camera
was developed. It was shown that a thin resonant film (quantum dots or molecules) could radiate
the angular sequence of delayed ultra-short pulses if a transverse spatial periodic distribution of
the laser pump field amplitude has a triangle shape
Morphology of ceramic particles produced by plasma-chemical synthesis
Thermal and diffusion processes in the droplet weakly concentrated metal salt solution during its heating in the plasma chemical reactor, in order to synthesize metal oxide powders are considered. Numerical study is based on previously proposed physical-mathematical model. The results of numerical calculations are analyzed to assess the possible influence of the operation parameters of the reactor and the characteristics of the initial solution (precursor) on the morphology of the particles formed
Collective and static properties of model two-component plasmas
Classical MD data on the charge-charge dynamic structure factor of
two-component plasmas (TCP) modeled in Phys. Rev. A 23, 2041 (1981) are
analyzed using the sum rules and other exact relations. The convergent power
moments of the imaginary part of the model system dielectric function are
expressed in terms of its partial static structure factors, which are computed
by the method of hypernetted chains using the Deutsch effective potential.
High-frequency asymptotic behavior of the dielectric function is specified to
include the effects of inverse bremsstrahlung. The agreement with the MD data
is improved, and important statistical characteristics of the model TCP, such
as the probability to find both electron and ion at one point, are determined.Comment: 25 pages, 6 figures, 5 tables. Published in Physical Review E
http://link.aps.org/abstract/PRE/v76/e02640
Ball Milled Gd Flakes Subjected to Heat Treatments: Structure, Magnetic and Magnetocaloric Properties
Gd flake samples were prepared by conventional ball milling technique starting from rapidly quenched Gd ribbons and followed by vacuum annealing in different conditions. Heat treatments were conducted in a vacuum at selected temperatures up to 600 K. The structural features, magnetic and magnetocaloric properties were comparatively analyzed. The change in magnetic entropy was calculated using an experimental set of magnetic isotherms measured in a wide range of temperatures. The variations in the refrigeration capacity and the exponent of the magnetic entropy change in the external magnetic field were carefully calculated and analyzed.The research funding from the Ministry of Science and Higher Education of the Russian Federation (Ural Federal University Program of Development within the Priority-2030 Program) is gratefully acknowledged. This research was supported in part by the Universidad del País Vasco/Euskal Herriko Unibertsitatea UPV/EHU Research Groups Funding
Mathematical modelling of the liquid atomization process by cocurrent gas flow
This paper focuses on the physical-mathematical model of liquid atomization in the spray pattern of an ejection nozzle. A flow field of a gas phase behind the nozzle section is computed using the Ansys Fluent package. Dynamics of molten metal droplets in the gas phase within a trajectory approach is calculated. Using the presented model, numerical calculation results are given
Non-Ohmic variable-range hopping transport in one-dimensional conductors
We investigate theoretically the effect of a finite electric field on the
resistivity of a disordered one-dimensional system in the variable-range
hopping regime. We find that at low fields the transport is inhibited by rare
fluctuations in the random distribution of localized states that create
high-resistance ``breaks'' in the hopping network. As the field increases, the
breaks become less resistive. In strong fields the breaks are overrun and the
electron distribution function is driven far from equilibrum. The logarithm of
the resistance initially shows a simple exponential drop with the field,
followed by a logarithmic dependence, and finally, by an inverse square-root
law.Comment: Version accepted to Phys. Rev. Let
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