Studying characteristics of a fine layered structure of the lower troposphere on the basis of acoustic pulse sounding     

I. P. Chunchuzov  V. G. Perepelkin  O. E. Popov  S. N. Kulichkov  A. A. Vardanyan  G. Y. Ayvazyan  Kh. Z. Khachikyan 《Izvestiya Atmospheric and Oceanic Physics》2017,53(3):279-293

Results of acoustic sounding of the lower troposphere with the aid of detonation generators of acoustic pulses are given. This sounding method is based on a partial reflection of acoustic pulses with shock fronts from vertical wind-velocity and temperature gradients continuously varying with height in the troposphere and on the penetration of reflected signals into the region of acoustic shadow. Experiments on tropospheric sounding were carried out on the ground of the Barva Innovation Scientific and Technical Center (Talin, Armenia) in September 2015. In these experiments, an antihail acoustic system was first used as a generator of acoustic pulses. Experimental results have been compared with data obtained earlier in similar experiments carried out in the vicinity of Zvenigorod with the use of a special detonation generator of acoustic pulses. Due to the high resolution (in height) of the sounding method, which reaches 1 m in the stably stratified lower troposphere within a height range of 250–600 m, the vertical profiles of layered effective sound speed inhomogeneities with vertical scales from a few to a few tens of meters have been retrieved. The influence of these fluctuations on the form and amplitude of acoustic signals at a long distance from their pulsed source has been studied.  相似文献   

Parkerite and bismutohauchecornite in chromitites of the Urals: Example of the Uralian Emerald Mines     

V. A. Koroteev  M. P. Popov  Yu. V. Erokhin  V. V. Khiller 《Doklady Earth Sciences》2017,473(2):438-440

An unusual ore mineralization represented by parkerite, millerite, bismutohauchecornite, bismuthinite, and nickeline was registered in altered chromitite from the Mariinsk emerald–beryllium deposit. Such mineralization is typical of Cu–Ni sulfide ores and hydrothermal veins from the five-element formation. This mineral assemblage was not registered in ophiolitic ultrabasic rocks and related chromitites. The find of bismutohauchecornite is the first in the Urals; the find of parkerite is the third.  相似文献   

Probing cosmic plasma with giant pulses from the crab nebula pulsar     

A. G. Rudnitskii  M. V. Popov  V. A. Soglasnov 《Astronomy Reports》2017,61(5):393-405

A review and comparative analysis of results from studies of the effects of scattering on the interstellar medium using giant pulses of the Crab Nebula pulsar (B0531+21) are presented. This analysis was based on eight epochs of Very Long Baseline Interferometry (VLBI) radio observations carried out as part of the scientific program of the Radio Astron mission during 2011–2015. The scintillation timescale t _scint and spectral index γ for the power-law energy distribution of the pulses were obtained for each observing epoch. The measured scintillation timescales are t _scint = 7.5?123 s at 1668 MHz and t _scint = 2.9 s at 327 MHz. The spectral indices are ?1.6...?2.5. The frequency and time characteristics of the scattering were measured using two independent methods: based on the decorrelation bandwidth Δν _d and the scattering timescale τ _SC. The angular size of the scattering disk θ _H of the pulsar was obtained, the phase structure functions constructed, and the distance to the effective scattering screen estimated. The derived diameter of the scattering disk θ _H at 1668 MHz ranges from 0.4 to 1.3 mas, while the scatteringdisk diameter at 327 MHz is 14.0 mas. The measured distance to the effective scattering screen ranges from 0.7 to 1.9 kpc, and varies from observation to observation in the same way as the scattering timescale and decorrelation bandwidth: τ _SC ≈ 0.9?5.8 μs and Δν _d ≈ 40.7?161 kHz at 1668 MHz. The scattering timescale and decorrelation bandwidth at 327 MHz are 2340 μs and 68 Hz.  相似文献   

Quintinite-1<Emphasis Type="Italic">M</Emphasis> from the Mariinsky Deposit,Ural Emerald Mines,Central Urals,Russia     

E.?S.?ZhitovaEmail author  M.?P.?Popov  S.?V.?Krivovichev  A.?N.?Zaitsev  N.?S.?Vlasenko 《Geology of Ore Deposits》2017,59(8):745-751

The paper describes the first finding of quintinite [Mg₄Al₂(OH)₁₂][(CO₃)(H₂O)₃] at the Mariinsky deposit in the Central Urals, Russia. The mineral occurs as white tabular crystals in cavities within altered gabbro in association with prehnite, calcite, and a chlorite-group mineral. Quintinite is the probable result of late hydrothermal alteration of primary mafic and ultramafic rocks hosting emerald-bearing glimmerite. According to electron microprobe data, the Mg: Al ratio is ~2: 1. IR spectroscopy has revealed hydroxyl and carbonate groups and H₂O molecules in the mineral. According to single crystal XRD data, quintinite is monoclinic, space group C2/m, a =5.233(1), b = 9.051(2), c = 7.711(2) Å, β = 103.09(3)°, V = 355.7(2) ų. Based on structure refinement, the polytype of quintinite should be denoted as 1M. This is the third approved occurrence of quintinite-1M in the world after the Kovdor complex and Bazhenovsky chrysotile–asbestos deposit.  相似文献   

Environmental–geochemical transformation of the supergene zone under the effect of an oil-producing complex     

R. F. Abdrakhmanov  V. G. Popov 《Water Resources》2015,42(7):854-863

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Elitogenesis in Russia: geographical aspect     

P.L. Popov 《Geography and Natural Resources》2010,31(4):385-389

The birthplace differentiation for representatives of different groups of the Russian elite is considered for macroregions, subjects of the RF and cities. It is shown that in the elite groups under consideration, the proportions of natives of Moscow and St. Petersburg exceed several times the proportions of natives of these cities in the country's population. The other large cities, especially Yekaterinburg, Kazan, Chelyabinsk, Nizhni Novgorod, Ufa, Saratov, Voronezh, Irkutsk, Omsk, and Rostov-on-Don, are centers of elitogenesis vastly excelled by the two capital cities. The differences between macroregions without regard for Moscow and Saint Petersburg are significant in separate aspects of elitogenesis.  相似文献   

The propagation of an acoustic pulse in a near-ground atmospheric waveguide     

I. P. Chunchuzov  S. N. Kulichkov  O. E. Popov  V. G. Perepelkin 《Izvestiya Atmospheric and Oceanic Physics》2010,46(5):597-607

A wave theory of propagation of an acoustic pulse in a moving stratified atmospheric layer above the ground with a finite impedance of an underlying ground surface is developed. The shapes of acoustic signals in a near-ground atmospheric waveguide, which are formed due to temperature inversion and a vertical shear of the wind velocity, are calculated based on this theory. These signals are compared with those measured during the experiments where vertical profiles of the wind velocity and temperature in an atmospheric boundary layer have been continuously controlled using a sodar, a temperature profile meter, and acoustic anemometers or thermometers mounted on a 56-meter-high mast. The joint action of a near-ground acoustic waveguide, the impedance of the underlying surface, and a vertical layered structure of the boundary atmospheric layer on a signal shape far from the acoustic source are studied.  相似文献   

Application of the Gaussian beam method to elasticity theory     

A. P. Katchalov  M. M. Popov 《Geophysical Journal International》1985,81(1):205-214

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Photometric study of the Peculiar galaxy NGC 2685     

V. A. Gagen-Torn  I. I. Popov  V. A. Yakovleva 《Astrophysics》1983,19(4):325-333

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On the correct use of cumulative applied climate indices for studying biological objects     

E. N. Popova  V. V. Yasyukevich  I. O. Popov 《Russian Meteorology and Hydrology》2017,42(10):661-664

The cumulative applied climate indices SAT and SET used in the Russian literature are considered in detail. These indices differ in calculation methods and, consequently, their values differ in different regions. The example is presented of the incorrect use of these indices by some authors for studying biological objects which leads to false conclusions. The method of calculation of the foreign applied climate index GDD is given. This index corresponds to the Russian index SET, and its interpretation as a counterpart of SAT is wrong.  相似文献