549 research outputs found
THE IMPACT OF INNOVATIVE TECHNOLOGIES ON THE STABLE DEVELOPMENT OF ENTERPRISES OF HOTEL INDUSTRY
Currently, there is increased competition in the hospitality industry and innovative technologies have a direct impact on the sustainable development of enterprises. The article examines the main trends in the development of the hotel industry, particular attention is paid to the conversion of the number of rooms and the provision of various services in the hospitality industry. The impact of innovation on technological processes is analyzed, the analysis revealed the potential benefits of the functioning of the hotel enterprises. Future opportunities for the development of hotels using creative and innovative solutions are discussed. In the review of international hotel complexes the authors come to the conclusion that innovation processes are considered an integral part of modern business in the hospitality industry
Sound Propagation in Nematic Fermi Liquid
We study the longitudinal sound propagation in the electronic nematic Fermi
liquid where the Fermi surface is distorted due to the spontaneously broken
rotational symmetry. The behavior of the sound wave in the nematic ordered
state is dramatically different from that in the isotropic Fermi liquid. The
collective modes associated with the fluctuations of the Fermi surface
distortion in the nematic Fermi liquid leads to the strong and anisotropic
damping of the sound wave. The relevance of the nematic Fermi liquid in doped
Mott insulator is discussed.Comment: 4 pages, no figur
Photophoresis of topical steroids in the treatment of severe forms of lichen ruber planus of oral mucosa
The objective of the study is to search for new methods of treatment for lichen ruber planus with high efficacy, few complications and side effects, as well as providing a long-term therapeutic effect. The authors used the method of photophoresis (red LED radiation + topical steroid) in the combination treatment of 40 patients with severe forms of lichen ruber planu
Photophoresis of topical steroids in the treatment of severe forms of lichen ruber planus of oral mucosa
The objective of the study is to search for new methods of treatment for lichen ruber planus with high efficacy, few complications and side effects, as well as providing a long-term therapeutic effec
GRB 190114C: from prompt to afterglow?
GRB 190114C is the first gamma-ray burst detected at Very High Energies (VHE,
i.e. >300 GeV) by the MAGIC Cherenkov telescope. The analysis of the emission
detected by the Fermi satellite at lower energies, in the 10 keV -- 100 GeV
energy range, up to ~ 50 seconds (i.e. before the MAGIC detection) can hold
valuable information. We analyze the spectral evolution of the emission of GRB
190114C as detected by the Fermi Gamma-Ray Burst Monitor (GBM) in the 10 keV --
40 MeV energy range up to ~60 sec. The first 4 s of the burst feature a typical
prompt emission spectrum, which can be fit by a smoothly broken power-law
function with typical parameters. Starting on ~4 s post-trigger, we find an
additional nonthermal component, which can be fit by a power law. This
component rises and decays quickly. The 10 keV -- 40 MeV flux of the power-law
component peaks at ~ 6 s; it reaches a value of 1.7e-5 erg cm-2 s-1. The time
of the peak coincides with the emission peak detected by the Large Area
Telescope (LAT) on board Fermi. The power-law spectral slope that we find in
the GBM data is remarkably similar to that of the LAT spectrum, and the GBM+LAT
spectral energy distribution seems to be consistent with a single component.
This suggests that the LAT emission and the power-law component that we find in
the GBM data belong to the same emission component, which we interpret as due
to the afterglow of the burst. The onset time allows us to estimate the initial
jet bulk Lorentz factor Gamma_0 is about 500, depending on the assumed
circum-burst density.Comment: 7 pages, 2 figures, in press, accepted for publication in A&
The rise and fall of the high-energy afterglow emission of GRB 180720B
The Gamma Ray Burst (GRB) 180720B is one of the brightest events detected by
the Fermi satellite and the first GRB detected by the H.E.S.S. telescope above
100 GeV. We analyse the Fermi (GBM and LAT) and Swift (XRT and BAT) data and
describe the evolution of the burst spectral energy distribution in the 0.5 keV
- 10 GeV energy range over the first 500 seconds of emission. We reveal a
smooth transition from the prompt phase, dominated by synchrotron emission in a
moderately fast cooling regime, to the afterglow phase whose emission has been
observed from the radio to the GeV energy range. The LAT (0.1 - 100 GeV) light
curve initially rises (), peaks at 78 s, and
falls steeply () afterwards. The peak, which we
interpret as the onset of the fireball deceleration, allows us to estimate the
bulk Lorentz factor under the assumption of a
wind-like (homogeneous) circum-burst medium density. We derive a flux upper
limit in the LAT energy range at the time of H.E.S.S. detection, but this does
not allow us to unveil the nature of the high energy component observed by
H.E.S.S. We fit the prompt spectrum with a physical model of synchrotron
emission from a non-thermal population of electrons. The 0 - 35 s spectrum
after its peak (at 1 - 2 MeV) is a steep power law extending to
hundreds of MeV. We derive a steep slope of the injected electron energy
distribution . Our fit parameters point towards a
very low magnetic field ( G) in the emission region.Comment: 10 pages, 6 figures, submitted to A&
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