Results 51 to 60 of about 24,888 (220)

Evolutionary Approach to Lambert’s Problem for Non-Keplerian Spacecraft Trajectories

Aerospace, 2017
In this paper, we use differential evolution (DE), with best-evolved results refined using a Nelder–Mead optimization, to solve boundary-value complex problems in orbital mechanics relevant to low Earth orbits (LEO).
David W. Hinckley, Darren L. Hitt
doaj   +1 more source

A search for transits of GJ 581\lowercase{e} and characterization of the host star variability using MOST space telescope photometry [PDF]

, 2012
The GJ 581 system has been amply studied since its discovery in 2005: the number of known planets in the system has increased and their orbital parameters are among the most precisely determined for radial velocity detected exoplanets.
Dragomir, Diana, Gladman, Brett J., Guenther, David B., Kuschnig, Rainer, Matthews, Jaymie M., Moffat, Anthony F. J., Rowe, Jason F., Rucinski, Slavek M., Sasselov, Dimitar, Weiss, Werner W.   +9 more
core   +2 more sources

Unified Analysis of Fermionic Tunneling, Barrow‐Exponential Entropy Corrections, and Plasma Lensing in Carrollian Reissner‐Nordström Spacetime

Annalen der Physik, Volume 538, Issue 3, March 2026.
Carrollian Reissner‐Nordström black holes are investigated through fermionic tunneling, entropy‐corrected thermodynamics, and plasma‐modified gravitational lensing. The generalized uncertainty principle introduces minimal‐length corrections to the Hawking temperature, while the combined Barrow‐Exponential entropy reveals smooth thermodynamic crossovers
Erdem Sucu, İzzet Sakallı, Yusuf Sucu
wiley   +1 more source

On the Disappearance of Kilohertz Quasi-Periodic Oscillations at a High Mass Accretion Rate in Low-Mass X-ray Binaries

, 2000
For all sources in which the phenomenon of kilo-Hertz quasi-periodic oscillation (kHz QPO) is observed, the QPOs disappear abruptly when the inferred mass accretion rate exceeds a certain threshold.
Meyer F., Wei Cui
core   +2 more sources

The M Dwarf GJ 436 and its Neptune-Mass Planet [PDF]

, 2006
We determine stellar parameters for the M dwarf GJ 436 that hosts a Neptune-mass planet. We employ primarily spectral modeling at low and high resolution, examining the agreement between model and observed optical spectra of five comparison stars of type,
A. T. Shreve, Baraffe I., Delfosse X., Delfosse X., E. B. Ford, G. B. Basri, G. W. Marcy, H. L. Maness, Hubickyj O., Jones H. R. A., Jones H. R. A., P. H. Hauschildt, Perryman M. A. C., R. P. Butler, S. S. Vogt, Siess L.   +15 more
core   +3 more sources

Quantitative Mapping of Fibrotic Tissue Mechanics via Brillouin Spectroscopy

Journal of Biophotonics, Volume 19, Issue 3, March 2026.
Brillouin spectroscopy distinguishes fibrotic from healthy tissue based on localized stiffness changes and enables real‐time monitoring of dynamic alterations in viscoelastic properties during fibrogenesis.ABSTRACTFibrosis is a pathological scarring process that disrupts tissue architecture, and is characterized by excessive extracellular matrix (ECM ...
Vsevolod Cheburkanov, Sujeong Jung, Mikhail Y. Berezin, Vladislav V. Yakovlev   +3 more
wiley   +1 more source

Overview of electric solar wind sail applications; pp. 267–278 [PDF]

Proceedings of the Estonian Academy of Sciences, 2014
We analyse the potential of the electric solar wind sail for solar system space missions. The applications studied include flyby missions to terrestrial planets (Venus, Mars and Phobos, Mercury) and asteroids, missions based on non-Keplerian orbits ...
Pekka Janhunen, Petri Toivanen, Jouni Envall, Sini Merikallio, Giuditta Montesanti, Jose Gonzalez del Amo, Urmas Kvell, Mart Noorma, Silver Lätt   +8 more
doaj   +1 more source

Monoaxial Electrodynamic Stabilization of an Artificial Earth Satellite in the Orbital Coordinate System via Control With Distributed Delay

IEEE Access, 2021
An artificial Earth satellite (AES) with three different principal central moments of inertia is under consideration. The AES moves along a Keplerian circular equatorial near-Earth orbit.
Alexander Aleksandrov, Alexey A. Tikhonov   +1 more
doaj   +1 more source

First Coincident Radar and Optical Observations of a Meteor Radio Afterglow

Journal of Geophysical Research: Space Physics, Volume 131, Issue 3, March 2026.
Abstract It has been hypothesized that Meteor Radio Afterglows (MRAs) occur due to resonant transition radiation (RTR) where suprathermal electrons emit as they pass through electron density inhomogeneities in a turbulent plasma. Meteor trails are thought to produce suprathermal electrons through anion oxidation, which can be identified through meteor ...
K. S. Obenberger, J. L. Chau, J. Vierinen, D. Vida, L. E. Cordonnier, Z. Balint, M. Clahsen, E. Dao, J. Dowell, J. M. Holmes, R. F. Kelly, D. Kastinen, N. Pfeffer, K. Robinson, G. B. Taylor, J. M. Urco   +15 more
wiley   +1 more source

Confirmation of a Non‐Transiting Planet in the Habitable Zone of the Nearby M Dwarf L 98‐59

Astronomische Nachrichten, Volume 347, Issue 2, February 2026.
ABSTRACT Only 40 exoplanetary systems with five or more planets are currently known. These systems are crucial for our understanding of planet formation and planet‐planet interaction. The M dwarf L 98‐59 has previously been found to show evidence of five planets, three of which are transiting.
Paul I. Schwarz, Stefan Dreizler, René Heller   +2 more
wiley   +1 more source