30 Result(s)
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Article
A. V. Biryukov
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Article
Evolutionary Status of Long-Period Radio Pulsars
We consider the evolutionary status of the recently discovered long-period radio sources PSR J0901-4046, GLEAM-X J1627-52, and GPM J1839-10. It is hypothesized that all three sources are radio pulsars. Within ...
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Comparison of Approximate and Numerical Methods for Solving the Homogeneous Dirichlet Problem for the Helmholtz Operator in a Two-Dimensional Domain
A method for finding an approximate solution of the homogeneous Dirichlet problem for the Helmholtz operator in a 2-D domain is under consideration. In the polar coordinates, an approximate solution is represe...
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HD 4915 at the Beginning of Maunder Minimum of Activity
Based on the available photometric data spanning almost 8000 days (21.9 years) of observations of a bright G5 V dwarf, solar-type star HD 4915, we carried out a study of the manifestations of its activity, pro...
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Activity of ET Dra—a Star of FK Com Type
Abstract—We present new results of the study of ET Dra—a star of the FK Com type—based on observations carried out at the Zvenigorod Observatory of the Institute of Astronomy of RAS with the help of the FRAM-ORM ...
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Article
Observability of Single Neutron Stars at SRG/eROSITA
A four-year sky survey with the use of the eROSITA telescope on board the Spektr-RG observatory with focusing optics will provide the best coverage in the soft (0.5–2 keV) and standard (2–10 keV) X-ray ranges,...
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Mechanical means for controlling the geometry of optical spacecraft attitude control systems and the necessary accuracy of these means
The accuracy of modern spacecraft attitude sensors has recently come to exceed the accuracy provided by the rigidity of the mechanical designs of spacecraft. One possible solution to this problem is to introdu...
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Wide-field optical monitoring with Mini-MegaTORTORA (MMT-9) multichannel high temporal resolution telescope
We describe the properties of Mini-MegaTORTORA (MMT-9) nine-channel wide-field optical sky monitoring system with subsecond temporal resolution. This instrument can observe sky areas as large as 900 deg2, perform...
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Superorbital variability of the X-ray flux in the Be-donor binaries SXP 138, GX-304, and γ Cas
RXTE observations of the X-ray binary systems SXP 138, GX-304, and γ Cas in 1997–2011 have shown for the first time that these objects (X-ray binaries with Be donors) display X-ray flux variations on timescales o...
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Article
Test results of radio interferometer with zero base in the RadioAstron project
In preparation for the launch of a space telescope for ground tests within the ground-space RadioAstron project, procedures and methods are developed in order to carry out tests under the zero base interferome...
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Article
A Quantum-Chemical Study of Tautomeric Equilibria of Fluorescein Dyes in DMSO
We evaluated the relative thermodynamic stability of various molecular and anionic tautomers of fluorescein, its 2,4,5,7-tetrabromo derivative (eosin), and also sulfofluorescein, 4'- and 5'-amino-fluoresceins,...
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The LYRA-B space experiment: Goals and principles for its realization
We describe goals and principles for the realization the Lyra-B space experiment onboard the International Space Station, which is currently being prepared at the Sternberg Astronomical Institute. The main goa...
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“RadioAstron”-A telescope with a size of 300 000 km: Main parameters and first observational results
The Russian Academy of Sciences and Federal Space Agency, together with the participation of many international organizations, worked toward the launch of the RadioAstron orbiting space observatory with its on...
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Radioastron (Spectr-R Project)—a radio telescope much larger than the earth: main parameters and prelaunch tests
The Russian Academy of Sciences and the Russian Federal Space Agency are planning to launch Radioastron in 2011, which is a unique space observatory with a 10-meter reflector antenna. In conjunction with the larg...
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Radioastron (Spectr-R project)—a radio telescope much larger than the earth: Ground segment and key science areas
The space interferometer Radioastron is working jointly with the largest radio telescopes of the world. Ground tracking stations provide for retrieving the information and determining the orbital parameters for d...
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Search for possible connections between isolated radio pulsars and supernova remnants
We have developed a method of searching for the connections between the isolated radio pulsars and supernova remnants, based on the analysis of their kinematic characteristics. We investigate fairly young (τ ...
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Non-monotonous character of single radio pulsar spin-down
Our paper is dedicated to the problem of anomalous values of braking indices n obs and spin frequency second derivatives \(\ddot \nu\) of isolated radio...
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Erratum to: “Electric Drives of Mine-Lifting Machines”
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Search for pairs of isolated radio pulsars—Components in disrupted binary systems
We have developed a method for analyzing the kinematic association of isolated relativistic objects-possible remnants of disrupted close binary systems. We investigate pairs of fairly young radio pulsars with ...
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Article
Electric drives of mine-lifting machines
The problems of the development and industrial application of electric drives for mine-lifting machines are discussed. Two types of electric drives, i.e., AC electric drives with a cycloconverter-fed synchrono...
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Article
Gold deposits in dikes of the Yana-Kolyma belt
The ore-bearing dikes widespread in the Yana-Kolyma metallogenic belt vary in composition from granite porphyry to lamprophyres, gabbromonzonite, and dolerite. The dikes make up suites tens of kilometers in ex...
