On the dynamical structure of the Trojan group of asteroids

Using a semi-analytical approach, domains of possible motion for Trojan asteroids were established. It is shown that stable librating motion is possible for both high inclination and high eccentricity. Frequency distributions were also produced for real Trojan asteroids, against differing libration amplitudes and libration periods

Influence of Irregularities of Water Vapor Field in Surface Layer of the Atmosphere on the Results of Satellite Monitoring of Hydropower Structures in Region of Reservoirs

© 2018, Springer Science+Business Media, LLC, part of Springer Nature. Results are presented for the modeling of coordinate errors in the projected GNSS system of monitoring the Zagorsk GAES-2 that are caused by local atmospheric irregularities in the surface layer. It has been established that for mean meteorological conditions, these errors can reach 0.8 mm for elevation and 0.1 mm for horizontal position. It is noted that actual instantaneous irregularities exceed mean values by an order of magnitude and can thus cause larger errors in coordinates

Influence of Irregularities of Water Vapor Field in Surface Layer of the Atmosphere on the Results of Satellite Monitoring of Hydropower Structures in Region of Reservoirs

© 2018, Springer Science+Business Media, LLC, part of Springer Nature. Results are presented for the modeling of coordinate errors in the projected GNSS system of monitoring the Zagorsk GAES-2 that are caused by local atmospheric irregularities in the surface layer. It has been established that for mean meteorological conditions, these errors can reach 0.8 mm for elevation and 0.1 mm for horizontal position. It is noted that actual instantaneous irregularities exceed mean values by an order of magnitude and can thus cause larger errors in coordinates

Study influence of defects on the natural oscillation frequencies parts power plants

The results of studies of the influence of defects on the natural frequencies of the turbocharger turbine housing. The studies were conducted by means of finite element modeling software ANSYS and developed a program to generate images of vibro-acoustic research object in the graphical programming environment LabVIEW. Experimental studies on the turbocharger turbine housing using designed and developed measurement -diagnostic complex. Work performed under contract with the Ministry of Education of the Russian Federation from "12" February 2013 № 02.G25.31.0004

The structure and dynamics of the HF-pumped ionosphere based on a joint analysis of the artificial airglow spots and two-dimensional maps of the total electron content

© 2019 IEEE. The paper carries out preliminary processing of experimental data for August 29, 2016, obtained during joint measurements of artificial variations in the total electron content of the ionosphere on a network of 20 GNSS stations located within a radius of 400km from the 'Sura' facility, mainly in eastern and southeastern directions, and artificial airglow in the 630nm red line of atomic oxygen, stimulated by powerful radio emission from the 'Sura' facility. A direct comparison between the images of artificial airglow spots and TEC maps is presented. Dynamic spatial-temporal picture of the TEC variations in the heating region of the HF-pumped ionosphere, where plasma waves are generated, capable of accelerating electrons to the excitation potential of optical levels is obtained

The structure and dynamics of the HF-pumped ionosphere based on a joint analysis of the artificial airglow spots and two-dimensional maps of the total electron content

© 2019 IEEE. The paper carries out preliminary processing of experimental data for August 29, 2016, obtained during joint measurements of artificial variations in the total electron content of the ionosphere on a network of 20 GNSS stations located within a radius of 400km from the 'Sura' facility, mainly in eastern and southeastern directions, and artificial airglow in the 630nm red line of atomic oxygen, stimulated by powerful radio emission from the 'Sura' facility. A direct comparison between the images of artificial airglow spots and TEC maps is presented. Dynamic spatial-temporal picture of the TEC variations in the heating region of the HF-pumped ionosphere, where plasma waves are generated, capable of accelerating electrons to the excitation potential of optical levels is obtained

Toward the azimuthal characteristics of ionospheric and seismic effects of "chelyabinsk" meteorite fall according to the data from coherent radar, GPS, and seismic networks

©2015. American Geophysical Union. All Rights Reserved. We present the results of a study of the azimuthal characteristics of ionospheric and seismic effects of the meteorite 'Chelyabinsk,' based on the data from the network of GPS receivers, coherent decameter radar EKB, and network of seismic stations, located near the meteorite fall trajectory. It is shown that 6-14 min after the bolide explosion, GPS network observed the cone-shaped wavefront of traveling ionospheric disturbances (TIDs) that is interpreted as a ballistic acoustic wave. The typical TIDs propagation velocity were observed 661 ± 256 m/s, which corresponds to the expected acoustic wave speed for 240 km height. Fourteen minutes after the bolide explosion, at distances of 200 km, we observed the emergence and propagation of a TID with annular wavefront that is interpreted as gravitational mode of internal atmospheric waves. The propagation velocity of this TID was 337 ± 89 m/s which corresponds to the propagation velocity of these waves in similar situations. At EKB radar, we observed TIDs in the sector of azimuthal angles close to the perpendicular to the meteorite trajectory. The observed TID velocity (400 m/s) and azimuthal properties correlate well with the model of ballistic wave propagating at 120-140 km altitude. It is shown that the azimuthal distribution of the amplitude of vertical seismic oscillations with periods 3-60 s can be described qualitatively by the model of vertical strike-slip rupture, propagating at 1 km/s along the meteorite fall trajectory to distance of about 40 km. These parameters correspond to the direction and velocity of propagation of the ballistic wave peak by the ground. It is shown that the model of ballistic wave caused by supersonic motion and burning of the meteorite in the upper atmosphere can satisfactorily explain the various azimuthal ionospheric effects, observed by the coherent decameter radar EKB, GPS receivers network, and the azimuthal characteristics of seismic waves at large distances

Toward the azimuthal characteristics of ionospheric and seismic effects of "chelyabinsk" meteorite fall according to the data from coherent radar, GPS, and seismic networks

©2015. American Geophysical Union. All Rights Reserved. We present the results of a study of the azimuthal characteristics of ionospheric and seismic effects of the meteorite 'Chelyabinsk,' based on the data from the network of GPS receivers, coherent decameter radar EKB, and network of seismic stations, located near the meteorite fall trajectory. It is shown that 6-14 min after the bolide explosion, GPS network observed the cone-shaped wavefront of traveling ionospheric disturbances (TIDs) that is interpreted as a ballistic acoustic wave. The typical TIDs propagation velocity were observed 661 ± 256 m/s, which corresponds to the expected acoustic wave speed for 240 km height. Fourteen minutes after the bolide explosion, at distances of 200 km, we observed the emergence and propagation of a TID with annular wavefront that is interpreted as gravitational mode of internal atmospheric waves. The propagation velocity of this TID was 337 ± 89 m/s which corresponds to the propagation velocity of these waves in similar situations. At EKB radar, we observed TIDs in the sector of azimuthal angles close to the perpendicular to the meteorite trajectory. The observed TID velocity (400 m/s) and azimuthal properties correlate well with the model of ballistic wave propagating at 120-140 km altitude. It is shown that the azimuthal distribution of the amplitude of vertical seismic oscillations with periods 3-60 s can be described qualitatively by the model of vertical strike-slip rupture, propagating at 1 km/s along the meteorite fall trajectory to distance of about 40 km. These parameters correspond to the direction and velocity of propagation of the ballistic wave peak by the ground. It is shown that the model of ballistic wave caused by supersonic motion and burning of the meteorite in the upper atmosphere can satisfactorily explain the various azimuthal ionospheric effects, observed by the coherent decameter radar EKB, GPS receivers network, and the azimuthal characteristics of seismic waves at large distances