Results 71 to 80 of about 24,888 (220)

Sonic-Point Model of Kilohertz Quasi-Periodic Brightness Oscillations in Low-Mass X-ray Binaries

, 1998
Strong, coherent, quasi-periodic brightness oscillations (QPOs) with frequencies ranging from about 300 Hz to 1200 Hz have been discovered with the Rossi X-ray Timing Explorer in the X-ray emission from some fifteen neutron stars in low-mass binary ...
Dimitrios Psaltis, Frederick K. Lamb, Friedman B., Hasinger G., Kuulkers E., Kuulkers E., M. Coleman Miller, Muchotrzeb B., Muchotrzeb-Czerny B., Oosterbroek T., Pandharipande V. R., Shinoda K., Spruit H. C., van der Klis M., Wijers R. A. M. J., Wijnands R. A. D.   +15 more
core   +1 more source

Transformer‐Enhanced Multi‐Satellite IRS Coordination for Next‐Generation LEO Communications

IET Communications, Volume 20, Issue 1, January/December 2026.
This paper introduces a novel transformer‐enhanced framework for multi‐satellite intelligent refelecting surfaces (IRS) coordination that addresses these fundamental limitations through physics‐informed neural architectures incorporating orbital dynamics modelling, multi‐head self‐attention mechanisms for temporal dependency capture across rapidly ...
Ali Hussein Radhi, Mahmood Mohassel Feghhi, Mohammad Ali Balafar   +2 more
wiley   +1 more source

Closed-Form Statistical Relations Between Projected Separation, Semimajor Axis, Companion Mass, and Host Acceleration

The Open Journal of Astrophysics
I derive the statistical relationship between a radial velocity or astrometric acceleration (a trend), a companion's mass, and the projected separation of the companion.
Timothy D Brandt
doaj   +1 more source

The Divine Clockwork: Bohr's correspondence principle and Nelson's stochastic mechanics for the atomic elliptic state [PDF]

, 2008
We consider the Bohr correspondence limit of the Schrodinger wave function for an atomic elliptic state. We analyse this limit in the context of Nelson's stochastic mechanics, exposing an underlying deterministic dynamical system in which trajectories ...
Andrew Neate, Aubrey Truman, Nelson E., Nelson E., Richard Durran, Simon B., Truman A., Veretennikov A. Yu., Wang F.-Y., Willems J. L.   +9 more
core   +4 more sources

Characterisation and Classification of Resident Space Objects Using Radar Networks

IET Radar, Sonar &Navigation, Volume 20, Issue 1, January/December 2026.
This paper describes a simulated environment for generating Inverse Synthetic Aperture Radar (ISAR) images and interferometric point clouds using a three‐receiver radar configuration, along with the creation of extensive datasets to train and evaluate deep learning models under varying Signal‐to‐Noise Ratio (SNR) conditions. Findings show that modified
Manjunath Thindlu Rudrappa, Marcus Albrecht, Peter Knott   +2 more
wiley   +1 more source

Librating Kozai–Lidov Cycles with a Precessing Quadrupole Potential Are Analytically Approximately Solved

The Astronomical Journal
The very long term evolution of the hierarchical restricted three-body problem with a slightly aligned precessing quadrupole potential is investigated analytically for librating Kozai–Lidov cycles (KLCs).
Ygal Y. Klein, Boaz Katz
doaj   +1 more source

Semi-relativistic approximation to gravitational radiation from encounters with nonspinning black holes [PDF]

, 2007
The capture of compact bodies by black holes in galactic nuclei is an important prospective source for low frequency gravitational wave detectors, such as the planned Laser Interferometer Space Antenna.
C. W. Misner, Daniel J. Kennefick, E. Poisson, I. S. Gradshteyn, Jonathan R. Gair, M. Abramowitz, R. Ruffini, Shane L. Larson, T. Tanaka, T. Tanaka   +9 more
core   +1 more source

Investigating the Dependence of Optimal Orientation of Flat Solar Collectors on Latitude and Climate Types Under Clear Sky Conditions

International Journal of Photoenergy, Volume 2026, Issue 1, 2026.
This study investigates the daily dependence of the optimal angle of a flat solar collector on geographical latitude, climate type, and altitude under clear sky conditions. Hottel′s model is primarily used to mathematically describe the clear sky condition. In addition, this paper considers three other clear sky models.
Amir Aghamohammadi, M. Ebrahim Foulaadvand, Alireza Aghamohammadi, Alberto Álvarez-Gallegos   +3 more
wiley   +1 more source

Resonant and near-resonant dynamics of narrow rings around minor bodies: Symmetric and asymmetric solutions

Astronomy & Astrophysics
Context. Narrow, dense rings have been detected around several Centaurs and trans-Neptunian objects, and they appear located in the immediate vicinity of spin-orbit resonances (SORs) with the central body. Although resonant motion has not been confirmed,
Beaugé C., Gianuzzi E., Cerioni M., Zoppetti F. A., Leiva A. M., Trógolo N.   +5 more
doaj   +1 more source

THE IMAGE SPEED DURING THE OPTICAL-ELECTRONIC SURFACING THE PLANET

Российский технологический журнал, 2018
In this paper, a formula is obtained for calculating the velocity of an image in the plane of image fixation during a space survey of the planet's surface with the aid of an on-oard optoelectronic device.
V. Ya. Gecha, M. Yu. Zhilenev, V. B. Fyodorov, D. A. Khrychev, Yu. I. Khudak, A. V. Shatina   +5 more
doaj   +1 more source