A method of processing data provided by a gradient-distributed temperature sensor

This paper describes an algorithm for processing data provided by a gradient-distributed temperature sensor, based on the regularization method, to estimate internal wave parameters in the thermocline. Measurements of the average temperature in the layer, temperature data at its boundaries, as well as the vertical temperature profile at the initial moment of time serve as input data. Data on the error-level of parameter measurements and ana priori assumption as to the monotonic declining of temperature with depth is applied. Examples of computations are given illustrating the validity of the algorithm.Translated by V. Puchkin.     

Evolution and characteristic times of the relativistic jet activity of quasars and radio galaxies

We discuss the evolution and characteristic times of the jet activity of quasars and radio galaxies within the scope of the quantum vortex model of relativistic jet activity of these objects (Ukrainskii Fizicheskii Zhurnal, 1991, vol. 36, no. 12, pp. 1785–1795; Kinematika i Fizika Nebesnykh Tel, 1997, vol. 13, no. 5, pp. 24–35). The characteristic times of evolution predicted by the theory lie in the range from 10⁷ to 10⁸ years.     

Ultrahigh-energy gamma-ray emission from the Geminga pulsar

In 1996–1997, the Geminga pulsar was observed at the Crimean Astrophysical Observatory with a ground-based gamma-ray telescope. An analysis of the observational data suggests that this object is a source of ultrahigh-energy gamma rays. An analysis of the temporal distribution of gamma-ray photons by an epoch-folding technique reveals a periodicity in the gamma-ray emission with a period of 0.237 s.     

The characterisation of a cerenkov imaging telescope for ground-based gamma-ray astronomy through correlation of coincident images

The Cerenkov installation of the Crimean Astrophysical Observatory, consisting of two identical detectors, separated by 20m, are mounted in parallel for comparing the parameters of images. The average counting rate at one section is 35% higher than at the other. The number of coincident flashes make up 55% for one section and 76% for the second section. The comparison of parameters of coincident events shows high correlation of centroid positions (correlation coefficient r=0.98), of length (r=0.70), orientational angle (r=0.64). The correlation of width parameters is considerably lower (r=0.44).Since the coincident flashes at the two sections correspond to the same EAS their image parameters must be the same or very close. Hence the correlation coefficient between identical parameters of coincident flashes will characterize the quality of equipment and the method of observational data processing.     

Observations of active galactic nuclei with GT-48 gamma-ray telescope in 2007–2009

Results of observations of active galactic nuclei with the gamma-telescope GT-48 during 2007?C2009 are presented. It is shown that the very-high-energy (E > 10¹² eV) gamma radiation from galaxies 3C 66A, Mrk 421, Mrk 501, and BL Lac is variable.     

Results of observation of Cyg γ-2, BL Lac, 3C66A, Mk 501, and the Crab nebula by the GT-48 gamma-ray telescope in 2006

The active galactic nuclei BL Lac, 3C66A, and Mk501, as well as the Crab nebula and the Cyg γ-2 source were observed in 2006 at the Crimean Astrophysical Observatory using the GT-48 gamma-ray telescope. Very high energy (VHE) gamma-ray fluxes at a high confidence level (Q > 4) were detected from the active galactic nuclei and the Crab nebula. VHE gamma-ray fluxes from the unidentified gamma-ray source Cyg γ-2 and the X-ray source Cyg X-3 were recorded during observations of Cyg γ-2.     

Volgian–Early Berriasian Marginal Filter in the West Siberian Marine Basin and Its Influence on Sediment Distribution

Lithology and Mineral Resources - The West Siberian marine basin of the Volgian–initial Berriasian ages is described. It is shown that a marginal filter (according to A.P. Lisitsyn)...     

Observations of the flux of very-high-energy gamma rays from the blazar 3C 66A

Measurements of the flux of very-high-energy (>1 TeV) gamma rays from the blazar 3C 66A obtained over four years are presented. The mean flux over the four-year period was (2.8±0.4)×10^?11 cm^?2 s^?1. There is a correlation between the season-averaged flux of very-high-energy gamma rays and the observed optical radiation.     

BL Lac: A new ultrahigh-energy gamma-ray source

The active galactic nucleus BL Lac was observed with the GT-48 atmospheric Cherenkov detector of the Crimean Astrophysical Observatory from July 23–September 1, 1998, in order to search for ultrahighenergy gamma-ray (>1 TeV) emission. The object was in the field of view of the detector for more than 24 hours. The source was detected with a high level of confidence (7.2 σ) with a flux equal to (2.1±0.4)×10^?11 photons cm^?2 s^?1.     

Influence of a Vertical Shift in the Current Velocity during Propagation of Contaminated Water from an Underwater Outfall under Stratified Conditions

Doklady Earth Sciences - The features of the spatial structure of coastal water caused by the impact of a nonstationary deep source of waste under stratified conditions is studied using a numerical...