136 research outputs found
On the possible nature of Bp-Ap Stars: an application to HD101065 and HR465
We have proposed the new explanation of some magnetic chemically peculiar
(MCP) stars anomalies, which is based on assumption that such stars can be the
close binary systems with a secondary component being neutron star. Within this
hypothesis one can naturally explain the main anomalous features of MCP stars:
first of all, an existence of the short-lived radioactive isotopes detected in
some stars (like Przybylski's star and HR465), and some others peculiarities
(e.g. the behavior of CU Vir in radio range, the phenomenon of the roAp stars).Comment: 5 pages, 5 figure
Some evolutionary aspects of the binary stellar systems containing neutron star
The obvious lack of the binary stellar systems that contain neutron stars
(NS) is observed at present. Partly it is caused by the fact that it is very
difficult to detect neutron star in a binary system if this relativistic
component does not manifest itself as a radio pulsar. Among 1879 pulsars that
are listed in the ATNF pulsar catalogue, only 141 pulsars are known to be the
companions in binary systems. Only 81 objects having median mass estimation of
more than 0.2 constitute the binary systems with pulsars.
Nevertheless, such systems should be much more numerous and their investigation
is of the great interest because thier structure and evolution can certainly
help in our understanding of many unique properties that are seen in some
stars.Comment: Accepted to published in the Odessa Astronomical Publications, 2012,
vol. 25/1, p.35-3
Investigation of the Earth Ionosphere using the Radio Emission of Pulsars
The investigation of the Earth ionosphere both in a quiet and a disturbed
states is still desirable. Despite recent progress in its modeling and in
estimating the electron concentration along the line of sight by GPS signals,
the impact of the disturbed ionosphere and magnetic field on the wave
propagation still remains not sufficiently understood. This is due to lack of
information on the polarization of GPS signals, and due to poorly conditioned
models of the ionosphere at high altitudes and strong perturbations. In this
article we consider a possibility of using the data of pulsar radio emission,
along with the traditional GPS system data, for the vertical and oblique
sounding of the ionosphere. This approach also allows to monitor parameters of
the propagation medium, such as the dispersion measure and the rotation measure
using changes of the polarization between pulses. By using a selected pulsar
constellation it is possible to increase the number of directions in which
parameters of the ionosphere and the magnetic field can be estimated.Comment: 13 pages, 4 figures, Baltic Astronomy, vol.22, 53-65, 201
Tunnelling series in terms of perturbation theory for quantum spin systems
Considered is quantum tunnelling in anisotropic spin systems in a magnetic
field perpendicular to the anisotropy axis. In the domain of small field the
problem of calculating tunnelling splitting of energy levels is reduced to
constructing the perturbatio n series with degeneracy, the order of degeneracy
being proportional to a spin value. Partial summation of this series taking
into account ''dangerous terms'' with small denominators is performed and the
value of tunnelling splitting is calculated with allowance for the first
correction with respect to a magnetic field.Comment: 7 pages, REVTeX 3.
Some Statistical Picture of Magnetic CP Stars Evolution
We discuss some statistical results on the evolution of magnetic CP stars in
the framework of the supposition about their binary nature.Comment: 3 pages, 3 figure
ΠΠΌΡΠ½ΠΈ ΠΌΡΠΆΠ΄ΠΈΡΠ΅ΡΠΎΠ½Π½ΠΎΡ ΡΠ° Π²Π½ΡΡΡΡΡΠ½ΡΠΎΠ΄ΠΈΡΠ΅ΡΠΎΠ½Π½ΠΎΡ Π³Π΅ΡΠ΅ΡΠΎΠΌΠΎΡΡΡΡ ΡΠΊΠ°Π½ΠΈΠ½ ΡΠΊΡΡΠΈ Π·Π° ΡΠΌΠΎΠ² Π²ΠΏΠ»ΠΈΠ²Ρ Π½Π°Π½ΠΎΡΠ°ΡΡΠΈΠ½ΠΎΠΊ ΡΡΡΠ±Π»Π° ΡΠΎΠ·ΠΌΡΡΠΎΠΌ 20, 30, 70 Π½ΠΌ
The study is focused on developing of morphological criteria of biological tissue reactions to metal nanoparticles
by detecting changes of tissues heteromorphism interacting with NPs. The study of heteromorphism
tissue provides an integrated assessment of functional state of the tissue, allowing objectively evaluate
the response of biological tissues in metal nanoparticles. Size-dependent effects of silver nanoparticles
were identified, namely depending on the nanoparticles size recovery rate of basement membrane structure
differs; the increase of mitotic index of the epidermal basal cells; changes of dermal fibroblastsβs heteromorphism,
such as increasing of number of functionally active fibroblasts; and the number of collagen
fibers of the dermis. Reactive changes of intradifferon heteromorphism of epidermal basal cells and the
dermal fibroblasts was described using quantitative histological methods.ΠΠ΅ΡΠΎΡ Π΄ΠΎΡΠ»ΡΠ΄ΠΆΠ΅Π½Π½Ρ Ρ ΡΠΎΠ·ΡΠΎΠ±ΠΊΠ° ΠΌΠΎΡΡΠΎΠ»ΠΎΠ³ΡΡΠ½ΠΈΡ
ΠΊΡΠΈΡΠ΅ΡΡΡΠ² ΠΎΡΡΠ½ΠΊΠΈ ΡΠ΅Π°ΠΊΡΡΠΉ Π±ΡΠΎΠ»ΠΎΠ³ΡΡΠ½ΠΈΡ
ΡΠΊΠ°Π½ΠΈΠ½ Π½Π° ΠΌΠ΅ΡΠ°Π»Π΅Π²Ρ Π½Π°Π½ΠΎΡΠ°ΡΡΠΈΠ½ΠΊΠΈ ΠΌΠ΅ΡΠΎΠ΄ΠΎΠΌ Π·ΠΌΡΠ½ Π²Π½ΡΡΡΡΡΠ½ΡΠΎ- ΠΉ ΠΌΡΠΆΠ΄ΠΈΡΠ΅ΡΠΎΠ½Π½ΠΎΡ Π³Π΅ΡΠ΅ΡΠΎΠΌΠΎΡΡΡΡ ΡΠΊΠ°Π½ΠΈΠ½, ΡΠΊΡ Π²Π·Π°ΡΠΌΠΎΠ΄ΡΡΡΡ ΡΠ· Π½Π°Π½ΠΎΡΠ°ΡΡΠΈΠ½ΠΊΠ°ΠΌΠΈ. ΠΠΈΠ²ΡΠ΅Π½Π½Ρ ΡΠΊΠ°Π½ΠΈΠ½Π½ΠΎΡ Π³Π΅ΡΠ΅ΡΠΎΠΌΠΎΡΡΡΡ Π·Π°Π±Π΅Π·ΠΏΠ΅ΡΡΡ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ½Ρ ΠΎΡΡΠ½ΠΊΡ ΡΡΠ½ΠΊΡΡΠΎ Π½Π°Π»ΡΠ½ΠΎΠ³ΠΎ ΡΡΠ°Π½Ρ ΡΠΊΠ°Π½ΠΈΠ½ΠΈ, Π΄ΠΎΠ·Π²ΠΎΠ»ΡΡΡΠΈ ΠΎΠ±βΡΠΊΡΠΈΠ²Π½ΠΎ ΠΎΡΡΠ½ΠΈΡΠΈ ΡΠ΅Π°ΠΊΡΡΡ Π±ΡΠΎΠ»ΠΎΠ³ΡΡΠ½ΠΈΡ
ΡΠΊΠ°Π½ΠΈΠ½ ΠΏΡΠΈ Π²Π·Π°ΡΠΌΠΎΠ΄ΡΡ Π· Π½Π°Π½ΠΎΡΠ°ΡΡΠΈΠ½ΠΊΠ°ΠΌΠΈ ΠΌΠ΅ΡΠ°Π»ΡΠ². ΠΠ° Π΄ΠΎΠΏΠΎΠΌΠΎΠ³ΠΎΡ ΠΊΡΠ»ΡΠΊΡΡΠ½ΠΈΡ
Π³ΡΡΡΠΎΠ»ΠΎΠ³ΡΡΠ½ΠΈΡ
ΠΌΠ΅ΡΠΎΠ΄ΠΈΠΊ ΠΎΠΏΠΈΡΠ°Π½Ρ ΡΠ΅Π°ΠΊΡΠΈΠ²Π½Ρ Π·ΠΌΡΠ½ΠΈ Π²Π½ΡΡΡΡΡΠ½ΡΠΎΠ΄ΠΈΡΠ΅ΡΠΎΠ½Π½ΠΎΡ Π³Π΅ΡΠ΅ΡΠΎΠΌΠΎΡΡΡΡ ΠΊΠ»ΡΡΠΈΠ½ Π±Π°Π·Π°Π»ΡΠ½ΠΎΠ³ΠΎ ΡΠ°ΡΡ Π΅ΠΏΡΠ΄Π΅ΡΠΌΡΡΡ Ρ ΡΡΠ±ΡΠΎΠ±Π»Π°ΡΡΡΠ² Π΄Π΅ΡΠΌΠΈ. ΠΠΈΡΠ²Π»Π΅Π½Ρ ΡΠΎΠ·ΠΌΡΡΠΎΠ·Π°Π»Π΅ΠΆΠ½Ρ Π΅ΡΠ΅ΠΊΡΠΈ Π²ΠΏΠ»ΠΈΠ²Ρ Π½Π°Π½ΠΎΡΠ°ΡΡΠΈΠ½ΠΎΠΊ ΡΡΡΠ±Π»Π°
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