184 research outputs found
Relative equilibria in the unrestricted problem of a sphere and symmetric rigid body
We consider the unrestricted problem of two mutually attracting rigid bodies,
an uniform sphere (or a point mass) and an axially symmetric body. We present a
global, geometric approach for finding all relative equilibria (stationary
solutions) in this model, which was already studied by Kinoshita (1970). We
extend and generalize his results, showing that the equilibria solutions may be
found by solving at most two non-linear, algebraic equations, assuming that the
potential function of the symmetric rigid body is known explicitly. We
demonstrate that there are three classes of the relative equilibria, which we
call "cylindrical", "inclined co-planar", and "conic" precessions,
respectively. Moreover, we also show that in the case of conic precession,
although the relative orbit is circular, the point-mass and the mass center of
the body move in different parallel planes. This solution has been yet not
known in the literature.Comment: The manuscript with 10 pages, 5 figures; accepted to the Monthly
Notices of the Royal Astronomical Societ
Determining the effectiveness of protective fences from explosions of terroristic orientation
Resonances and O-curves in Hamiltonian systems
We investigate the problem of the existence of trajectories asymptotic to
elliptic equilibria of Hamiltonian systems in the presence of resonances.Comment: 12 page
The restricted two-body problem in constant curvature spaces
We perform the bifurcation analysis of the Kepler problem on and .
An analogue of the Delaunay variables is introduced. We investigate the motion
of a point mass in the field of the Newtonian center moving along a geodesic on
and (the restricted two-body problem). When the curvature is small,
the pericenter shift is computed using the perturbation theory. We also present
the results of the numerical analysis based on the analogy with the motion of
rigid body.Comment: 29 pages, 7 figure
Improved ferroelectric performance of La:Hf0.5Zr0.5O2 thin films
This work was supported by Russian Science Foundation (Project. No 18-19-00527)
Non-linear stability in photogravitational non-planar restricted three body problem with oblate smaller primary
We have discussed non-linear stability in photogravitational non-planar
restricted three body problem with oblate smaller primary. By
photogravitational we mean that both primaries are radiating. We normalised the
Hamiltonian using Lie transform as in Coppola and Rand (1989). We transformed
the system into Birkhoff's normal form. Lie transforms reduce the system to an
equivalent simpler system which is immediately solvable. Applying Arnold's
theorem, we have found non-linear stability criteria. We conclude that is
stable. We plotted graphs for They are rectangular
hyperbola.Comment: Accepted for publication in Astrophysics & Space Scienc
Equilibria in the secular, non-coplanar two-planet problem
We investigate the secular dynamics of a planetary system composed of the
parent star and two massive planets in mutually inclined orbits. The dynamics
are investigated in wide ranges of semi-major axes ratios (0.1-0.667), and
planetary masses ratios (0.25-2) as well as in the whole permitted ranges of
the energy and total angular momentum. The secular model is constructed by
semi-analytic averaging of the three-body system. We focus on equilibria of the
secular Hamiltonian (periodic solutions of the full system), and we analyze
their stability. We attempt to classify families of these solutions in terms of
the angular momentum integral. We identified new equilibria, yet unknown in the
literature. Our results are general and may be applied to a wide class of
three-body systems, including configurations with a star and brown dwarfs and
sub-stellar objects. We also describe some technical aspects of the
semi-numerical averaging. The HD 12661 planetary system is investigated as an
example configuration.Comment: 18 pages, 17 figures, accepted to Monthly Notices of the Royal
Astronomical Societ
To the matter of the educated development of the construction industry of recreational territories
Rational creation of the consumer quality of constructions, which is taking into account some cultural, historical and other, accepted for society development paradigms enters to replace mass sustainable development of the industry of a construction in case of development of the recreational territories around megalopolises, using intellectual systems in a construction, ecological, energy-saving technologies in increase in a consumer evaluation of quality. For the residential development of the recreational territories of cities it is important to provide not only complex conditions of their development, to keep their potential for future generations, providing their social-and-economic development, to consider national and climatic features, but also to use their potential opportunities and traditions of the people inhabiting them, rationally and economically. The educated development of the construction industry is the new term entered into the use of constructors, when the consumer quality of building and structures meets national preferences taking into account traditions and advanced achievements in the use of materials, architectural and project decisions, production technologies and climatic opportunities with the minimum damage to the environment. Its accomplishment assumes enhancement and introduction of local-and-standard regulation with implementation of innovative solutions
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