65 research outputs found
The system of EAS time analysis
The extensive air showers' (EAS) front shape, angle of incidence, disk thickness, particle distribution along the shower, on the delayed and EAS front advancing particles were determined. The suggested system of the EAS time analysis allows determination of the whole EAS longitudinal structure at the observation points. The information from the detectors is continuously recorded in the memory with the memory cell switching in 5 ns, this enables fixation of the moment of pulse input from the detector with an accuracy to + or - 2.5 ns. Along with the fast memory, a slow memory with the cell switching in 1 micron s is introduced in the system, this permits observation of relatively large time intervals with respect to the trigger pulse with an appropriately lower accuracy
Perturbation theory in radial quantization approach and the expectation values of exponential fields in sine-Gordon model
A perturbation theory for Massive Thirring Model (MTM) in radial quantization
approach is developed. Investigation of the twisted sector in this theory
allows us to calculate the vacuum expectation values of exponential fields of the sine-Gordon theory in first order over Massive Thirring
Models coupling constant. It appears that the apparent difficulty in radial
quantization of massive theories, namely the explicite ''time'' dependence of
the Hamiltonian, may be successfully overcome. The result we have obtained
agrees with the exact formula conjectured by Lukyanov and Zamolodchikov and
coincides with the analogous calculations recently carried out in dual angular
quantization approach by one of the authors.Comment: 16 pages, no figures, LaTe
Disorder-induced tail states in a gapped bilayer graphene
The instanton approach to the in-gap fluctuation states is applied to the
spectrum of biased bilayer graphene. It is shown that the density of states
falls off with energy measured from the band-edge as , where the characteristic tail energy,
, scales with the concentration of impurities, , as
. While the bare energy spectrum is characterized by two energies:
the bias-induced gap, , and interlayer tunneling, , the tail,
, contains a {\it single} combination . We
show that the above expression for in the tail actually applies
all the way down to the mid-gap.Comment: 7 pages, 4 figure
Non-Bloch-Siegert-type power-induced shift of two-photon electron paramagnetic resonances of charge-carrier spin states in an OLED
We present Floquet theory-based predictions and electrically detected
magnetic resonance (EDMR) experiments scrutinizing the nature of two-photon
magnetic resonance shifts of charge-carrier spin states in the perdeuterated
-conjugated polymer poly[2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylene
vinylene] (d-MEH-PPV) under strong magnetic resonant drive conditions
(radiation amplitude ~ Zeeman field ). Numerical calculations show
that the two-photon resonance shift with power is nearly drive-helicity
independent. This is in contrast to the one-photon Bloch-Siegert shift that
only occurs under non-circularly polarized strong drive conditions. We
therefore treated the Floquet Hamiltonian analytically under arbitrary
amplitudes of the co- and counter-rotating components of the radiation field to
gain insight into the nature of the helicity dependence of multi-photon
resonance shifts. In addition, we tested Floquet-theory predictions
experimentally by comparing one-photon and two-photon charge-carrier spin
resonance shifts observed through room-temperature EDMR experiments on
d-MEH-PPV-based bipolar injection devices [i.e., organic light emitting diode
structures (OLEDs)]. We found that under the experimental conditions of strong,
linearly polarized drive, our observations consistently agree with theory,
irrespective of the magnitude of , and therefore underscore the robustness
of Floquet theory in predicting nonlinear magnetic resonance behaviors.Comment: 22 pages, 5 figure
Method of the Analysis of Gender Segregation at the Regional Labour Market
The labour markets of both a region and a country are characterized by a certain level of gender segregation. For the objective assessment of this phenomenon it is necessary to have a clear understanding of how this level changes over time, which processes at the labour market and in society facilitate the increase or decrease of gender asymmetry in the distribution of employees between economic activities and occupations and which economic consequences are caused by segregation. The questions raised are studied in the paper in terms of the dynamics of employed by the economic activities, which on the one hand reflects the desire of workers to be employed in certain activities and, on the other hand, characterizes the real employment opportunities. In order to identify the gender peculiarities of the changes in the regional employment structure, the authors suggested the methodology, based on the qualitative and quantitative approach to the assessment of the dynamics of the number of employed. The use of the index of dissimilarity allowed defining the share of employers of the same gender, which should have changed the sphere of activity provided that the employees of the other gender remain at their jobs, in order to achieve the equal distribution of men and women by economic activities. The obtained data confirm the necessity to implement the measures for the reduction of the gender segregation in the employment structure of the regional employment.
DOI: 10.5901/mjss.2015.v6n3s7p16
One-dimensional plasmons confined in bilayer graphene p-n junctions
Gapless spectrum of graphene allows easy spatial separation of electrons and
holes with an external in-plane electric field. Guided collective plasmon modes
can propagate along the separation line, whose amplitude decays with the
distance to it. Their spectrum and direction of propagation can be controlled
with the strength and direction of in-plane electric field. In case of a
bilayer graphene additional control is possible by the perpendicular electric
field that opens a gap in the band spectrum of electrons. We investigate guided
plasmon spectra in bilayer p-n junctions using hydrodynamics of charged
electron liquid.Comment: published version, minor change
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