Results 21 to 30 of about 572,560 (281)

Chaotic Spiral Galaxies

open access: yes, 2011
We study the role of asymptotic curves in supporting the spiral structure of a N-body model simulating a barred spiral galaxy. Chaotic orbits with initial conditions on the unstable asymptotic curves of the main unstable periodic orbits follow the shape ...
Contopoulos, George, Harsoula, Mirella
core   +1 more source

Charged-particle orbits near a magnetic null point [PDF]

open access: yes, 2000
An approximate analytical expression is obtained for the orbits of a charged particle moving in a cusp magnetic field. The particle orbits pass close to or through a region of zero magnetic field before being reflected in regions where the magnetic field
Jaroensutasinee, K.   +1 more
core   +1 more source

Uncertainty quantification of thermal barrier coatings lifetime on rotating turbine blades considering chemo-thermo-mechanically coupling failure

open access: yesMaterials & Design
The lifetime prediction of thermal barrier coatings (TBCs) on rotating turbine blades remains a significant challenge due to the complex service environment and multi-physics failure mechanisms.
Weiliang Yan   +6 more
doaj   +1 more source

Evaluación del desempeño de la radiación emitida por el sol como sistema de suministro de energía a un pico-satélite “CUBESAT” [PDF]

open access: yesTecnura, 2012
In the operation of a satellite is vital electricity, as this should feed all the same systems, such as command and control, that of communications, attitude control, among others.
Sergio Hernández R.   +2 more
doaj  

Observational data and orbits of the asteroids discovered at the Molėtai Observatory in 2010–2012

open access: yesOpen Astronomy, 2017
This paper is devoted to the discovery of asteroids at the Molėtai Astronomical Observatory (MAO) in 2010- 2012 together with the orbital analysis of two dynamically interesting Near Earth Objects (NEOs) discovered at the MAO, namely 2006 SF77 and 2010 ...
Włodarczyk Ireneusz   +2 more
doaj   +1 more source

New periodic orbits in the solar sail three-body problem [PDF]

open access: yes, 2011
We identify displaced periodic orbits in the circular restricted three-body problem, wher the third (small) body is a solar sail. In particular, we consider solar sail orbits in the earth-sun system which are high above the exliptic plane.
C.R. McInnes   +7 more
core   +1 more source

Resonant periodic orbits in the exoplanetary systems

open access: yes, 2013
The planetary dynamics of $4/3$, $3/2$, $5/2$, $3/1$ and $4/1$ mean motion resonances is studied by using the model of the general three body problem in a rotating frame and by determining families of periodic orbits for each resonance.
Antoniadou, K. I., Voyatzis, G.
core   +1 more source

Orbit Characterization, Stabilization and Composition on 3D Underactuated Bipedal Walking via Hybrid Passive Linear Inverted Pendulum Model [PDF]

open access: yes, 2019
A Hybrid passive Linear Inverted Pendulum (H-LIP) model is proposed for characterizing, stabilizing and composing periodic orbits for 3D underactuated bipedal walking.
Ames, Aaron D., Xiong, Xiaobin
core   +2 more sources

Finding Cliques in Projective Space: A Method for Construction of Cyclic Grassmannian Codes

open access: yesIEEE Access, 2020
In general, the construction of subspace codes or, in particular, cyclic Grassmannian codes in some projective space Pq(n) is highly mathematical and requires substantial computational power for the resulting searches.
Ismael Gutierrez-Garcia   +1 more
doaj   +1 more source

Semi-Analytical Search for Sun-Synchronous and Planet Synchronous Orbits around Jupiter, Saturn, Uranus and Neptune

open access: yesMathematics, 2022
With the development of aerospace science and technology, more and more probes are expected to be deployed around extraterrestrial planets. In this paper, some special orbits around Jupiter, Saturn, Uranus, and Neptune are discussed and analyzed.
Biao Yang   +7 more
doaj   +1 more source

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