128 research outputs found
Hierarchical Clustering of Seismic Activity Local Territories Globe
In article, the interrelation between energy parameters of Globe moving in a system Sun-Earth-Moon has been established. It includes features of a seasonal energy condition of an internal core of Earth and the key energy parameters of tectonic activity of seismically dangerous local territories of the planet. These parameters have been systematized by means of a clustering method hierarchical. The mechanism of energy influence of core Earth fluctuations on variations of axial rotation speed of the Globe and level of seismic activity has been grounded. The phenomenon of a periodic oscillation of planet condition seismic and effect of asymmetric distribution of the emergency situations (ES) of tectonic origin on the Earth's surface has been established. For the first time, ranging of the seismically fissile local territories of the Globe in the parameters determining the level of seismic activity and ranges of magnitudes was carried out. Based on these results the effect of division of the seismically fissile local territories into three main clusters that characterized by rather high, average and low degrees of seismic activity was established. Join of the ranged seismically fissile local territories of the Globe permit to establish zones with various degree of seismic activity along the section of various geophysical plates.The results received in article are a basis for further carrying out complex assessment of interrelations between key parameters of moving Globe in a system Sun-Earth-Moon and key parameters of tectonic danger of the seismically fissile local territories of Earth. It is base for further increase in effectiveness of monitoring of origin tectonic emergency by development of neural network prognostic models
The principles and methods of the appraisal of commercialization projects of the Universities innovations
The article deals with the summing up of the foreign experience and modern Russian tools of the appraisal of commercialization new technologies, worked up at UniversitiesyesБелгородский госуниверсите
Generation of coherent terahertz pulses in Ruby at room temperature
We have shown that a coherently driven solid state medium can potentially
produce strong controllable short pulses of THz radiation. The high efficiency
of the technique is based on excitation of maximal THz coherence by applying
resonant optical pulses to the medium. The excited coherence in the medium is
connected to macroscopic polarization coupled to THz radiation. We have
performed detailed simulations by solving the coupled density matrix and
Maxwell equations. By using a simple -type energy scheme for ruby, we have
demonstrated that the energy of generated THz pulses ranges from hundreds of
pico-Joules to nano-Joules at room temperature and micro-Joules at liquid
helium temperature, with pulse durations from picoseconds to tens of
nanoseconds. We have also suggested a coherent ruby source that lases on two
optical wavelengths and simultaneously generates THz radiation. We discussed
also possibilities of extension of the technique to different solid-state
materials
Complexation of the alkaline earth metals perchlorates with 3-hydroxyflavone in acetonitrile: Precise conductometric treatment
© 2017 Elsevier B.V. The alternative models of ionic equilibria in acetonitrile solutions of alkaline earth percholorates in the presence of 3-hydroxyflavone (HL) were studied by conductometry at 288.15, 298.15, 308.15, 318.15, and 328.15 K. Using a procedure specially developed for this task it was shown that in the solutions containing Ca(ClO 4 ) 2 and Sr(ClO 4 ) 2 the complexation of the cation (M 2 + ) by the HL molecule leads to the formation of the doubly-charged [M(HL)] 2 + complex species. In contrast to them, in the presence of Ba(ClO 4 ) 2 HL interacts with the ion pair BaClO 4 + forming the singly-charged [BaClO 4 (HL)] + complex. The limiting equivalent conductivities as well as the constants of complexation were estimated. The latter w ere calculated by taking into account the ion association between cation and anion of initial salts and activity coefficients, that is the ‘true’ thermodynamic constants were found. The reliability of the proposed approach was additionally checked by analyzing artificially noised model experimental data. It was shown that the fitted parameters can be satisfactorily reproduced even at the noise level equal to 2%. The limiting equivalent conductivities of the [Ca(HL)] 2 + , [Sr(HL)] 2 + and [BaClO 4 (HL)] + complex species were interpreted in terms of the Stokes radii whose values indicate very weak solvation of the formed complexes. The variation of the constants of complexation among cations was found to be in agreement with the values of primary association constants
Mineral Concentrates As a Factor of the Khibiny Apatite-Nepheline Ores Efficiency Improvement
Apatite-nepheline ores of the Khibiny deposits contain the largest phosphorus-bearing resources in the world, and, at the same time, they contain associated valuable components in the rock-forming minerals — apatite, nepheline, sphene and titanium magnetite. Intensive development of the Khibiny deposits with production of only apatite concentrate and a small part of nepheline concentrate resulted in the accumulation of over 1.0 billion tons of wastes in tailing storage facilities and dumps during 90 years of JSC Apatit operation. The possibility of increasing the efficiency of the use of the main concentrates of apatite-nepheline ores of the Khibiny deposits and wastes for their processing is considered through the use of technological developments of the FRC KSC RAS, JSC RIFI and JSC Apatit to obtain traditional and new target products. A fundamentally new approach to the problem of sustainable use of natural resources is focused on establishment of the whole production chain in the region, from mining and processing operations to manufacturers of final high technology products (rare-earth products, welding and construction materials, coloring agents and other materials). They also determine the level of industrial technical progress.
Keywords: Khibiny apatite-nepheline ores, mineral raw materials, extraction and processing, new material
On the local term in the anomaly-induced action of Weyl quantum gravity
The finite local conformally non-invariant -term emerges in the one-loop
effective action of the model of quantum gravity based on the Weyl-squared
classical action. This term is related to the contribution to the
conformal anomaly, which in a wide class of regularization schemes is
determined by the second Schwinger-DeWitt (or Gilkey-Seeley) coefficient of the
heat kernel expansion for inverse propagators of the theory. The calculation of
this term requires evaluating the contributions of the fourth-order derivative
minimal and of the second-order nonminimal operators in the tensor and vector
sectors of the theory, corresponding to metric, ghost and gauge-fixing
operators. To ensure the correctness of existing formulas, we derived (and
confirmed) the result using a special technique of calculations, based on the
heat-kernel representation of the Euclidean Green's function and the method of
universal functional traces.Comment: 30 page
СУЧАСНІ ПІДХОДИ ДО РЕАБІЛІТАЦІЇ ПРИ АБДОМІНАЛЬНОМУ ОЖИРІННІ
The article describes modern approaches to rehabilitation for abdominal obesity. Timely, effective rehabilitation and lifestyle changes can prevent or reduce the negative effects of excess body weight.У статті описано сучасні підходи до реабілітації при абдомінальному ожирінні. При своєчасній, ефективній реабілітації і зміні способу життя можна запобігти або зменшити кількість негативних наслідків надлишкової маси тіла
Measurement of filling-factor-dependent magnetophonon resonances in graphene using Raman spectroscopy.
We perform polarization-resolved Raman spectroscopy on graphene in magnetic fields up to 45 T. This reveals a filling-factor-dependent, multicomponent anticrossing structure of the Raman G peak, resulting from magnetophonon resonances between magnetoexcitons and E(2g) phonons. This is explained with a model of Raman scattering taking into account the effects of spatially inhomogeneous carrier densities and strain. Random fluctuations of strain-induced pseudomagnetic fields lead to increased scattering intensity inside the anticrossing gap, consistent with the experiments
Cluster Model of Decagonal Tilings
A relaxed version of Gummelt's covering rules for the aperiodic decagon is
considered, which produces certain random-tiling-type structures. These
structures are precisely characterized, along with their relationships to
various other random tiling ensembles. The relaxed covering rule has a natural
realization in terms of a vertex cluster in the Penrose pentagon tiling. Using
Monte Carlo simulations, it is shown that the structures obtained by maximizing
the density of this cluster are the same as those produced by the corresponding
covering rules. The entropy density of the covering ensemble is determined
using the entropic sampling algorithm. If the model is extended by an
additional coupling between neighboring clusters, perfectly ordered structures
are obtained, like those produced by Gummelt's perfect covering rules.Comment: 10 pages, 20 figures, RevTeX; minor changes; to be published in Phys.
Rev.
Intensity correlations in resonance nonlinear magneto-optical rotation
We have studied the intensity correlations between two orthogonally linearly
polarized components of a laser field propagating through a resonant atomic
medium. These experiments have been performed in a Rubidium atomic vapor. We
observe that the correlations between the orthogonally polarized components of
the laser beam are maximal in the absence of a magnetic field. The magnitude of
the correlations depends on the applied magnetic field, and the magnitude first
decreases and then increases with increasing magnetic field. Minimal
correlations and maximal rotation angles are observed at the same magnetic
fields. The width of the correlation function is directly proportional to the
excited state lifetime and inversely proportional to the Rabi frequency of
laser field. These results can be useful for improving optical magnetometers
and for optical field or atomic spin squeezing.Comment: 8 pages, 4 figure
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