2,782 research outputs found
Slow oscillations of magnetoresistance in quasi-two-dimensional metals
Slow oscillations of the interlayer magnetoresistance observed in the layered
organic metal -(BEDT-TTF)IBr are shown to originate from the
slight warping of its Fermi surface rather than from independent small
cyclotron orbits. Unlike the usual Shubnikov-de Haas effect, these oscillations
are not affected by the temperature smearing of the Fermi distribution and can
therefore become dominant at high enough temperatures. We suggest that the slow
oscillations are a general feature of clean quasi-two-dimensional metals and
discuss possible applications of the phenomenon.Comment: 11 pages, 3 figure
The experimental cascade curves of EAS at E sub 0 10(17) eV obtained by the method of detection of Cherenkov pulse shape
The individual cascade curves of EAS with E sub 0 10 to the 17th power eV/I to 3/ were studied by detection of EAS Cherenkov light pulses. The scintillators located at the center of the Yakutsk EAS array within a 500-m radius circle were used to select the showers and to determine the main EAS parameters. The individual cascade curves N(t) were obtained using the EAS Cherenkov light pulses satisfying the following requirements: (1) the signal-to-noise ratio fm/delta sub n 15, (2) the EAS axis-detector distance tau sub 350 m, (3) the zenith angle theta 30 deg, (4) the probability for EAS to be detected by scintillators W 0.8. Condition (1) arises from the desire to reduce the amplitude distortion of Cherenkov pulses due to noise and determines the range of EAS sizes, N(t). The resolution times of the Cherenkov pulse shape detectors are tau sub 0 approx. 23 ns which results in distortion of a pulse during the process of the detection. The distortion of pulses due to the finiteness of tau sub 0 value was estimated. It is shown that the rise time of pulse becomes greater as tau sub 0.5/tau sub 0 ratio decreases
Determination of the dimensions of the heat-affected zone in welding gas pipeline components
Analytical decisions supported by experimental data were used to determine the dependences for calculating the size of the heat-affected zone (HAZ) in multilayer welding of circumferential joints in transmission gas pipelines. Data on the dimensions of this zone are essential for evaluating the possibility of applying cold cutting in the rejection of elements of gas pipelines because of defects in circumferential welded joints or welded joints in transition rings in the vicinity of circumferential welded joints. © 2013 Copyright Taylor and Francis Group, LLC
Lie group analysis for multi-scale plasma dynamics
An application of approximate transformation groups to study dynamics of a
system with distinct time scales is discussed. The utilization of the
Krylov-Bogoliubov-Mitropolsky method of averaging to find solutions of the Lie
equations is considered. Physical illustrations from the plasma kinetic theory
demonstrate the potentialities of the suggested approach. Several examples of
invariant solutions for the system of the Vlasov-Maxwell equations for the
two-component (electron-ion) plasma are presented.Comment: Latex, 15 pages, 7 figure. This is an enlarged contribution to
Journal of Nonlinear Mathematical Physics v.18, Suppl. 1 (2011) p.163-175
with modest stylistic corrections introduced mainly in the third Sectio
Surface Crystallization in a Liquid AuSi Alloy
X-ray measurements reveal a crystalline monolayer at the surface of the
eutectic liquid Au_{82}Si_{18}, at temperatures above the alloy's melting
point. Surface-induced atomic layering, the hallmark of liquid metals, is also
found below the crystalline monolayer. The layering depth, however, is
threefold greater than that of all liquid metals studied to date. The
crystallinity of the surface monolayer is notable, considering that AuSi does
not form stable bulk crystalline phases at any concentration and temperature
and that no crystalline surface phase has been detected thus far in any pure
liquid metal or nondilute alloy. These results are discussed in relation to
recently suggested models of amorphous alloys.Comment: 12 pages, 3 figures, published in Science (2006
Documentary films translation: approaches and challenges
The article presents a comprehensive overview of different approaches to translating documentary
audiovisual productions. The abundance of documentary films available at online platforms lead to a
higher demand for their translation into different languages as the modern tradition in viewing
audiovisual content online requires a variety of language choice and modes of translation
presentation (subtitling, voice-over, accessibility means for people with auditory and visual
challenges). Documentary productions present a separate group of films that can be further classified
according to their production methods and the presentation styles. The specificity of each item of the
detailed classification calls for an individualized approach to handling the process of translating these
productions. Film terminology also requires special attention as it is one of the basic challenges of
documentary productions translation
Spin light of neutrino in gravitational fields
We predict a new mechanism for the spin light of neutrino () that can
be emitted by a neutrino moving in gravitational fields. This effect is studied
on the basis of the quasiclassical equation for the neutrino spin evolution in
a gravitational field. It is shown that the gravitational field of a rotating
object, in the weak-field limit, can be considered as an axial vector external
field which induces the neutrino spin procession. The corresponding probability
of the neutrino spin oscillations in the gravitational field has been derived
for the first time. The considered in this paper can be produced in the
neutrino spin-flip transitions in gravitational fields. It is shown that the
total power of this radiation is proportional to the neutrino gamma factor to
the fourth power, and the emitted photon energy, for the case of an ultra
relativistic neutrino, could span up to gamma-rays. We investigate the
caused by both gravitational and electromagnetic fields, also accounting for
effects of arbitrary moving and polarized matter, in various astrophysical
environments. In particular, we discuss the emitted by a neutrino
moving in the vicinity of a rotating neutron star, black hole surrounded by
dense matter, as well as by a neutrino propagating in the relativistic jet from
a quasar.Comment: 14 pages in LaTex with 1 eps figure; derivation of the neutrino spin
oscillations probability in gravitational fields and several clarifying notes
are added, typos correcte
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