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Attraction And Repulsion Of Multi-Color Laser Beams In Plasmas: A Computational Study
The nonlinear interaction of high-power multi-color laser beams in plasmas is investigated numerically. Both the relativistic mass increase and the driven plasma wave contribute to the mutual beam-beam interaction and to the development of the electromagnetic cascade. The propagation of the individual cascade sidebands is modelled in the paraxial approximation. The resulting set of coupled nonlinear envelope equations is solved numerically using a newly developed pseudospectral method. We predict that two beams intersecting in the plasma can either attract or deflect each other depending on whether their frequency detuning is slightly below or above the electron Langmuir frequency.Physic
Monte Carlo treatment of hadronic interactions in enhanced Pomeron scheme: I. QGSJET-II model
The construction of a Monte Carlo generator for high energy hadronic and
nuclear collisions is discussed in detail. Interactions are treated in the
framework of the Reggeon Field Theory, taking into consideration enhanced
Pomeron diagrams which are resummed to all orders in the triple-Pomeron
coupling. Soft and "semihard" contributions to the underlying parton dynamics
are accounted for within the "semihard Pomeron" approach. The structure of cut
enhanced diagrams is analyzed; they are regrouped into a number of subclasses
characterized by positively defined contributions which define partial weights
for various "macro-configurations" of hadronic final states. An iterative
procedure for a Monte Carlo generation of the structure of final states is
described. The model results for hadronic cross sections and for particle
production are compared to experimental data
The influence of the geomagnetic field and of the uncertainties in the primary spectrum on the development of the muon flux in the atmosphere
In this paper we study the sensitivity of the flux of atmospheric muons to
uncertainties in the primary cosmic ray spectrum and to the treatment of the
geomagnetic field in a calculation. We use the air shower simulation program
AIRES to make the calculation for two different primary spectra and under
several approximations to the propagation of charged particles in the
geomagnetic field. The results illustrate the importance of accurate modelling
of the geomagnetic field effects. We propose a high and a low fit of the proton
and helium fluxes, and calculate the muon fluxes with these different inputs.
Comparison with measurements of the muon flux by the CAPRICE experiment shows a
slight preference for the higher primary cosmic ray flux parametrization.Comment: 24 pages, 13 figures, submitted to Phys.Rev.
Study of the efficiency use of physical rehabilitation in patients with chronic gastritis
Purpose: to make physical rehabilitation program for patients with chronic gastritis type B, promotes normalization of gastric secretory function and prolong the period of remission. Objectives of the study was to assess the dynamics of gastric secretory function and functional status of the autonomic nervous system in patients with the chronic gastritis type B . Material: the study involved 37 women with a diagnosis of the chronic gastritis type B, increased acid gastric function. Results: it was established the positive influence of corrective exercises for the lower thoracic and lumbar spine, regulated breathing exercises based on the tone of the autonomic nervous system in combination with massage and diet therapy on the state of gastric secretory function. Conclusions : it is recommended to carry out therapeutic physical culture in the form of morning hygienic gymnastics, therapeutic exercises, self-study
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