30 research outputs found
Channeling of Electrons in a Crossed Laser Field
In this article a new analytical description of the effective interaction
potential for a charged particle in the field of two interfering laser beams is
presented. The potential dependence on the lasers intensities, orientation and
parameters of the particle entering the considered system is analyzed. It is
shown for the case of arbitrary lasers crossing angle that for different values
of projectile velocity the attracting potential becomes a scattering one so
that the channel axes and borders interchange each other. In addition the
projectile radiation spectral distribution is given and general estimations on
the expected beam radiation yield are outlined
Modeling of optical calculation of frontal lenses in view of technological features of assembly of microobjectives
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Statistical Properties and Predictability of Extreme Epileptic Events
The use of extreme events theory for the analysis of spontaneous epileptic brain activity is a relevant multidisciplinary problem. It allows deeper understanding of pathological brain functioning and unraveling mechanisms underlying the epileptic seizure emergence along with its predictability. The latter is a desired goal in epileptology which might open the way for new therapies to control and prevent epileptic attacks. With this goal in mind, we applied the extreme event theory for studying statistical properties of electroencephalographic (EEG) recordings of WAG/Rij rats with genetic predisposition to absence epilepsy. Our approach allowed us to reveal extreme events inherent in this pathological spiking activity, highly pronounced in a particular frequency range. The return interval analysis showed that the epileptic seizures exhibit a highly-structural behavior during the active phase of the spiking activity. Obtained results evidenced a possibility for early (up to 7 s) prediction of epileptic seizures based on consideration of EEG statistical properties
Statistics of transmission in one-dimensional disordered systems: universal characteristics of states in the fluctuation tails
We numerically study the distribution function of the conductance
(transmission) in the one-dimensional tight-binding Anderson and
periodic-on-average superlattice models in the region of fluctuation states
where single parameter scaling is not valid. We show that the scaling
properties of the distribution function depend upon the relation between the
system's length and the length determined by the integral density of
states. For long enough systems, , the distribution can still be
described within a new scaling approach based upon the ratio of the
localization length and . In an intermediate interval of the
system's length , , the variance of the Lyapunov
exponent does not follow the predictions of the central limit theorem and this
scaling becomes invalid.Comment: 22 pages, 12 eps figure
Collins and Sivers asymmetries in muonproduction of pions and kaons off transversely polarised protons
Measurements of the Collins and Sivers asymmetries for charged pions and charged and neutral kaons produced in semi-inclusive deep-inelastic scattering of high energy muons off transversely polarised protons are presented. The results were obtained using all the available COMPASS proton data, which were taken in the years 2007 and 2010. The Collins asymmetries exhibit in the valence region a non-zero signal for pions and there are hints of non-zero signal also for kaons. The Sivers asymmetries are found to be positive for positive pions and kaons and compatible with zero otherwise. © 2015