616 research outputs found
THE INFLUENCE OF THE DIGITAL ECONOMY ON THE DEVELOPMENT OF THE DOMESTIC ECONOMY
The article examines the problems and prospects for the development of the digital economy in Ukraine. The current trends of new technological solutions and opportunities are identified, because global informatization intensifies this process. The effective use of digital economy tools, the means of which is to ensure information security and stability in the country, is described.The article examines the problems and prospects for the development of the digital economy in Ukraine. The current trends of new technological solutions and opportunities are identified, because global informatization intensifies this process. The effective use of digital economy tools, the means of which is to ensure information security and stability in the country, is described
СТРУКТУРА И МЕХАНИЧЕСКИЕ СВОЙСТВА СЛИТКОВ И ПРОФИЛЕЙ ИЗ АЛЮМИНИЕВОГО СПЛАВА НА ОСНОВЕ СИСТЕМЫ AL-MG-MN
Commercial ingots and hot-pressed rolled sections of Al-Mg-Mn alloy doped with zinc, scandium, zirconium, chromium, and vanadium have been studied using optical microscopy, thermal analysis, electron microscopy, and electron-probe microanalysis. The compositions of the phase constituents and aluminum matrix of the alloy are determined. The sensitivity of the alloy to the formation of complex intermetallic compounds during solidification is revealed. The mechanical properties of ingots and rolled sections are determined. © 2013 Pleiades Publishing, Ltd
Interplay between charge-lattice interaction and strong electron correlations in cuprates: phonon anomaly and spectral kinks
We investigate the interplay between strong electron correlations and
charge-lattice interaction in cuprates. The coupling between half breathing
bond stretching phonons and doped holes in the t-t'-J model is studied by
limited phonon basis exact diagonalization method. Nonadiabatic electron-phonon
interaction leads to the splitting of the phonon spectral function at half-way
to the zone boundary at and
to low energy kink feature in the electron dispersion, in agreement with
experimental observations. Another kink due to strong electron correlation
effects is observed at higher energy, depending on the strength of the
charge-lattice coupling.Comment: 4 pages, 3 figure
Continuous input nonlocal games
We present a family of nonlocal games in which the inputs the players receive
are continuous. We study three representative members of the family. For the
first two a team sharing quantum correlations (entanglement) has an advantage
over any team restricted to classical correlations. We conjecture that this is
true for the third member of the family as well.Comment: Journal version, slight modification
Solid state amorphization in a thin Fe-Si-Mg-O surface film triggered by the reduction of elements from oxides in the temperature range of the α-γ transformation
The study of the processes occurring in the surface layer of the MgO coated commercial alloy Fe-3%Si-0.5%Cu (grain oriented electrical steel) demonstrated that the amorphous phase in the form of a Fe-based solid solution is formed during continuous heating in the 95%N2 + 5%H2 atmosphere. For the purposes of this study, the following methods were used: non-ambient XRD at 20 –1060°C with heating and cooling at a rate of 0.5 dps, layer-by-layer chemical analysis performed by a glow discharge analyzer, scanning electron microscopy and energy dispersive X-ray spectroscopy. ThermoCalc software was used to calculate the potential phase equilibrium states. The amorphous phase was formed in the α → γ transformation temperature range, when the heating rates were altered in the surface layer of 1 µm initially consisted of a solid α-Fe-based solution with ~1– 2 wt.% Si with (MgFe)2 SiO4, (MgFe)O, SiO2 oxide inclusions. We suppose that (MgFe)2 SiO4 oxides are partly reduced by H2 to Mg2 Si molecular complexes, which become solid solutions in the temperature range of the metastability of the α-Fe crystal lattice with subsequent amorphization as an alternative to the α → γ transition. The amorphous state is obtained at 920 – 960°C and is retained both at subsequent heating (to 1060°C) and cooling (to 20°С), which is super-stable compared to the established metallic glasses. The composition of the amorphous phase can be described by the formula Fe89.5 Si6 Mg4 Cu0.5. © 2020, Institute for Metals Superplasticity Problems of Russian Academy of Sciences. All rights reserved.Russian Foundation for Basic Research, RFBR: 20‑08‑00332Ministry of Education and Science of the Russian Federation, Minobrnauka: 11.1465.2014/K.Acknowledgements. This study was conducted using equipment provided by the Laboratory of Structural Analysis Techniques and Materials and Nanomaterials Properties of CKP Ural Federal University. The study was financially supported by Government Decree No. 211 of the Russian Federation, Contract No. 02. A03.21.0006 and within the framework of the state task issued by the Ministry of Education and Science of the Russian Federation, project No. 11.1465.2014/K. The reported study was funded by RFBR, project number 20‑08‑00332
Extracorporeal Shock Wave Therapy (ESWT) as a treatment for recurrent Neurogenic Heterotopic Ossification (NHO)
“This is an Accepted Manuscript of an article published by Taylor & Francis in Brain Injury on 5 Feb 2013, available online: http://www.tandfonline.com/10.3109/02699052.2012.729293."
© 2013 Informa UK Ltd.Primary objective: To describe the effects of extracorporeal shock wave therapy (ESWT) on neurogenic heterotopic ossification (NHO).
Research design: A single case study was considered the most appropriate methodology in this situation.
Methods and procedures: The subject was a 43 year old female 10 years post-traumatic brain injury with recurring NHO around the hip joint. Baseline assessments of pain using a 10-point VAS, range of motion of the hip using a goniometer and walking ability (number of steps over a standard distance) were conducted. Four applications of ESWT using a Minispec™ Extracorporeal Shock Wave Lithotripsy machine (Medispec Int. USA) administered over 6 weeks to the anterolateral aspect of the right hip. Follow-up assessments were conducted weekly over the period of intervention and then monthly for 5 months.
Main outcomes and results: Immediately following treatment, pain was reduced to 0 on the VAS scale; hip range of motion increased and the number of steps over a standard distance reduced, indicating increased step length. At 5-month follow-up, without further ESWT intervention, these results were maintained.
Conclusion: This case study suggests that ESWT may be a non-invasive, low risk intervention for the management of NHO
Modes of Oscillation in Radiofrequency Paul Traps
We examine the time-dependent dynamics of ion crystals in radiofrequency
traps. The problem of stable trapping of general three-dimensional crystals is
considered and the validity of the pseudopotential approximation is discussed.
We derive analytically the micromotion amplitude of the ions, rigorously
proving well-known experimental observations. We use a method of infinite
determinants to find the modes which diagonalize the linearized time-dependent
dynamical problem. This allows obtaining explicitly the ('Floquet-Lyapunov')
transformation to coordinates of decoupled linear oscillators. We demonstrate
the utility of the method by analyzing the modes of a small `peculiar' crystal
in a linear Paul trap. The calculations can be readily generalized to
multispecies ion crystals in general multipole traps, and time-dependent
quantum wavefunctions of ion oscillations in such traps can be obtained.Comment: 24 pages, 3 figures, v2 adds citations and small correction
Quasiparticle-like peaks, kinks, and electron-phonon coupling at the (,0) regions in the CMR oxide LaSrMnO
Using Angle-Resolved Photoemission (ARPES), we present the first observation
of sharp quasiparticle-like peaks in a CMR manganite. We focus on the (,0)
regions of k-space and study their electronic scattering rates and dispersion
kinks, uncovering the critical energy scales, momentum scales, and strengths of
the interactions that renormalize the electrons. To identify these bosons we
measured phonon dispersions in the energy range of the kink by inelastic
neutron scattering (INS), finding a good match in both energy and momentum to
the oxygen bond-stretching phonons
Time-of-Arrival States
Although one can show formally that a time-of-arrival operator cannot exist,
one can modify the low momentum behaviour of the operator slightly so that it
is self-adjoint. We show that such a modification results in the difficulty
that the eigenstates are drastically altered. In an eigenstate of the modified
time-of-arrival operator, the particle, at the predicted time-of-arrival, is
found far away from the point of arrival with probability 1/2.Comment: 15 pages, 2 figure
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