Results 61 to 70 of about 11,457,962 (286)

On bi-Hamiltonian formulation of the perturbed Kepler problem [PDF]

, 2015
The perturbed Kepler problem is shown to be a bi-Hamiltonian system in spite of the fact that the graph of the Hamilton function is not a hypersurface of translation, which goes against a necessary condition for the existence of the bi-Hamiltonian ...
Y. Grigoryev, A. Tsiganov
semanticscholar   +1 more source

Tractable but Hard to Approximate: The Bi‐Objective Minimum s$$ s $$‐t$$ t $$‐Cut Problem With Binary Capacities

Networks, EarlyView.
ABSTRACT The minimum s$$ s $$‐t$$ t $$‐cut problem is one of the most‐studied problems in discrete optimization and has a unique complexity status in multi‐objective optimization. Even though the single‐objective version of the problem can be solved in polynomial time, it has been shown in the seminal work of Papadimitriou and Yannakakis (2000) that ...
Jan Boeckmann, Stephan Helfrich, Oliver Bachtler, Stefan Ruzika, Clemens Thielen   +4 more
wiley   +1 more source

The Kepler problem with anisotropic perturbations [PDF]

Journal of Mathematical Physics, 2005
We study a two-body problem given by the sum of the Newtonian potential and an anisotropic perturbation that is a homogeneous function of degree −β, β⩾2. For β>2, the sets of initial conditions leading to collisions∕ejections and the one leading to escapes∕captures have positive measure.
Diacu, Florin, Pérez-Chavela, Ernesto, Santoprete, Manuele   +2 more
openaire   +2 more sources

Quasi-Bi-Hamiltonian structures of the 2-dimensional Kepler problem [PDF]

, 2015
The existence of quasi-bi-Hamiltonian structures for the Kepler problem is studied. We first relate the superintegrability of the system with the existence of two complex functions endowed with very interesting Poisson bracket properties and then we ...
J. Cariñena, M. F. Ranada
semanticscholar   +1 more source

Comprehensive Surrogate Models for Predicting the Melt Conveying Characteristics of Channel Segments in High‐Performance Single‐Screw Extruders

Polymer Engineering &Science, EarlyView.
Generalized analytical equations were developed that accurately predict the local pumping characteristics, viscous dissipation, and average shear rates in channels of both conventional and high‐performance single‐screw extruders. Applied within segmented extruder calculations, these models aid in screw design and process troubleshooting without the ...
Daniel Herzog, Wolfgang Roland, Christian Marschik, Gerald Berger‐Weber   +3 more
wiley   +1 more source

Three-Body 3D-Kepler Electromagnetic Problem—Existence of Periodic Solutions

AppliedMath
The main purpose of the present paper is to prove the existence of periodic solutions of the three-body problem in the 3D Kepler formulation. We have solved the same problem in the case when the three particles are considered in an external inertial ...
Vasil Georgiev Angelov
doaj   +1 more source

Linear frictional forces cause orbits to neither circularize nor precess

, 2008
For the undamped Kepler potential the lack of precession has historically been understood in terms of the Runge-Lenz symmetry. For the damped Kepler problem this result may be understood in terms of the generalization of Poisson structure to damped ...
Aceves H Colosimo M, Apostolatos T A, B Hamilton, Bellomo P Stroud C R, Bernoulli J, Brouwer D, Casertano S Phinney E S Villumsen J V, Cordani B, Danby J M A, Ermanno G J, Goldstein H, Guillemin V, Györgyi G, Györgyi G, Hermann J, Jose J V, Keane A J, Kustaanheimo P, Landau L D, Laplace P S, M Crescimanno, Mardling R A, Mayor M Mermilloid J C, Murray C D, Press W H, Quesne C, Runge C, Schutz B F, Tarasov V E, Watson J C   +29 more
core   +1 more source

The Sp(1)-Kepler problems [PDF]

Journal of Mathematical Physics, 2009
Let n≥2 be a positive integer. To each irreducible representation σ of Sp(1), an Sp(1)-Kepler problem in dimension (4n−3) is constructed and analyzed. This system is superintegrable, and when n=2 it is equivalent to a generalized MICZ-Kepler problem in dimension of 5.
openaire   +3 more sources

Oxygen Vacancies Modulation of Ammonium Tungsten Bronze by NH4+‐Assisted Heat Treatment for Highly Sensitive Detection of NO2

Rare Metals, EarlyView.
ABSTRACT Introducing oxygen vacancies has emerged as an essential strategy to affect the sensing properties of nanomaterials. However, existing methods for manipulating oxygen require high cost, complex operation, and harsh conditions. Herein, a simple NH4+‐assisted heat treatment approach was designed to regulate the concentration of oxygen vacancies ...
Qiu‐Yue Zheng, Xiao‐Li Cheng, Jing Tang, Ting‐Ting Wang, Xian‐Fa Zhang, Li‐Hua Huo, Chao‐Bo Huang, Zoltán Major, Yong‐Sheng Zhang, Peng‐Jin Ye, Ying‐Ming Xu   +10 more
wiley   +1 more source

The case of the Kepler DBAV star J1929+4447

EPJ Web of Conferences, 2013
A first pulsating white dwarf has been discovered recently in the Kepler field of view [1]. This star, catalogued as GALEX J192904.6+444708 or KIC 8626021, is a He-atmosphere white dwarf of the V777 Her (DBV) type.
Fontaine G., Brassard P.
doaj   +1 more source