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pro vyhledávání: '"PETROV, NIKOLA P."'
Akademický článek
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We present photometric observations in Sloan filters g', i' of the eclipsing W UMa stars USNO-A2.0 1350-17365531, V471 Cas, V479 Lac and V560 Lac. The sinusoidal-like O-C diagram of V471 Cas shows presence of third body with mass of 0.12 Msun (red dw
Externí odkaz:
http://arxiv.org/abs/1810.02084
Publikováno v:
RAA, Manuscript No. MS 4197 (RAA-2018-0107)
Photometric observations of the W UMa binary NSVS 2569022 are presented. The light curve solution reveals that both components are of F spectral type (temperatures $T_1$=$T_2$=6100 K). NSVS 254037 undergoes total eclipse of W subtype and the mass rat
Externí odkaz:
http://arxiv.org/abs/1806.02086
Akademický článek
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Autor:
de la Llave, Rafael, Petrov, Nikola P.
Siegel disks are domains around fixed points of holomorphic maps in which the maps are locally linearizable (i.e., become a rotation under an appropriate change of coordinates which is analytic in a neighborhood of the origin). The dynamical behavior
Externí odkaz:
http://arxiv.org/abs/0805.3477
Publikováno v:
Serbian Astronomical Journal, Vol 2019, Iss 198, Pp 55-60 (2019)
We present photometric observations of the newly-discovered transiting exoplanets HAT-P-54b and WASP-153b with the Rozhen 2 m telescope. As a result we improved their periods. The modeling of the new transits led to almost identical values of orbital
Externí odkaz:
https://doaj.org/article/dcedbdc3236145c390f415d68b7fa983
Autor:
Olvera, Arturo, Petrov, Nikola P.
We compute accurately the golden critical invariant circles of several area-preserving twist maps of the cylinder. We define some functions related to the invariant circle and to the dynamics of the map restricted to the circle (for example, the conj
Externí odkaz:
http://arxiv.org/abs/nlin/0609024
The rate of energy dissipation in solutions of the body-forced 3-d incompressible Navier-Stokes equations is rigorously estimated with a focus on its dependence on the nature of the driving force. For square integrable body forces the high Reynolds n
Externí odkaz:
http://arxiv.org/abs/physics/0607280
A new variational problem for upper bounds on the rate of energy dissipation in body-forced shear flows is formulated by including a balance parameter in the derivation from the Navier-Stokes equations. The resulting min-max problem is investigated c
Externí odkaz:
http://arxiv.org/abs/physics/0409041
Autor:
Petrov, Nikola P.
We study the problem of the behavior of a quantum massless scalar field in the space between two parallel infinite perfectly conducting plates, one of them stationary, the other moving periodically. We reformulate the physical problem into a problem
Externí odkaz:
http://arxiv.org/abs/quant-ph/0408010