Period-doubling bifurcation in surface radio-frequency trap: Transition to chaos through Feigenbaum scenario.

We have numerically investigated the dynamics of charged microparticles in a "five-wire" surface radio-frequency trap. The period-doubling bifurcation conditions have been shown to depend on the particle, the trap, and the alternating voltage parameters. For a comprehensive study of the dynamics chaotization through a cascade of period doubling, we have used Fourier analysis of a particle trajectory as well as the calculations of a non-trivial Lyapunov exponent map.

[Laser therapy in patients with inflammatory pleural exudates].

The outcomes of treatment of 140 patients with tuberculous parapneumatic serous pleurisy are presented, Intrapleural low-energy laser radiation, epicutaneous low-energy pulse radiation, and the successive application of both techniques were used during etiotropic therapy and regular exudate aspirations. There was reduction in the time of exudation into the pleural cavity, as well as recovery with less pronounced pleural impositions.