Results 31 to 40 of about 2,402 (235)
Degenerate billiards in celestial mechanics [PDF]
Regular and Chaotic Dynamics, 2017 In an ordinary billiard trajectories of a Hamiltonian system are elastically reflected after a collision with a hypersurface (scatterer). If the scatterer is a submanifold of codimension more than one, we say that the billiard is degenerate. Degenerate billiards appear as limits of systems with singularities in celestial mechanics.
Sergey V. Bolotin, Sergey V. Bolotin
openaire +4 more sources
Journal of the Association for Information Science and Technology, EarlyView.Abstract The term semantic primitives refers to a set of basic, atomic concepts from which all other (compound) concepts are constructed. It presupposes the principle of compositionality—the idea that complex items or expressions can be formed by combining simpler constituents.
Birger Hjørland
wiley +1 more source
The Proximities of Asteroids and Critical Points of the Distance Function [PDF]
Serbian Astronomical Journal, 2010 The proximities are important for different purposes,for example to evaluate the risk of collisions of asteroids or comets with the Solar-System planets.
Milisavljevic, S.
doaj +3 more sources
Empirical Stability Criteria for 3D Hierarchical Triple Systems. I. Circumbinary Planets
The Astronomical JournalIn this work we revisit the problem of the dynamical stability of hierarchical triple systems with applications to circumbinary planetary orbits. We derive critical semimajor axes based on simulating and analyzing the dynamical behavior of 3 × 10 ^8 ...
Nikolaos Georgakarakos +3 more
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Titius-Bode’s Relation and Distribution of Exoplanets [PDF]
Journal of Astronomy and Space Sciences, 2010 The distance distribution in our planetary system has been a controversial matter. Two kinds of important issues on Titius-Bode’s relation have been discussed up to now: one is if there is a simple mathematical relation between distances of natural ...
Heon-Young Chang
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Perspective Projection of an Ellipse and an Ellipsoid for Analytical View Factor Evaluation
Heat Transfer, EarlyView.ABSTRACT Radiative view factors are fundamental quantities for evaluating radiative heat transfer between different surfaces. While analytical expressions of view factors have been evaluated for various types of basic geometries, including circular disks and spheres, extending these solutions to more complex geometries, such as ellipses and ellipsoids ...
Kaname Sasaki
wiley +1 more source
Simulation of the Motion of Stars Escaping from the Galactic Center
Open Astronomy, 2015 Motions of stars escaping from the Galactic center are simulated. It is shown that the Galactic bar reduces the initial velocity needed to escape from the Galaxy.
Shirokova K. S.
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ChemistryOpen, EarlyView.Herein, the synthesis and production of n‐type ZnAlInO semiconductor materials is achieved utilizing sol–gel and cold pressing methods for fabrication in aerospace thermoelectric generators applications. The Seebeck coefficient and power factor values increase with the addition of template samples, reaching a maximum of −162.63 μV K−1 and 0.44 mW mK−2,
Enes Kilinc +4 more
wiley +1 more source
Advances and Trends in Terrain Classification Methods for Off‐Road Perception
Journal of Field Robotics, EarlyView.ABSTRACT Off‐road autonomous vehicles (OAVs) are becoming increasingly popular for navigating challenging environments in agriculture, military, and exploration applications. These vehicles face unique challenges, such as unpredictable terrain, dynamic obstacles, and varying environmental conditions.
Tanzila Arafin +5 more
wiley +1 more source
Modelling in Science Education and Learning, 2013 The solutions of the equations of motion for a point mass particle under a conservative force field are generally constrained by a basic set of integrals of motion, which depend on the knowledge about the potential function and on time and space ...
Rafael Cubarsi
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