Results 41 to 50 of about 19,555 (207)

Occurrence and Whistle Characteristics of Small Odontocetes in Two Coastal Regions of the Sea of Japan

Marine Mammal Science, Volume 42, Issue 3, July 2026.
ABSTRACT This study investigated the occurrence and whistle characteristics of small odontocetes in Wakasa Bay and Aso Bay, located in the coastal waters of the Sea of Japan, where ecological data are limited. Passive acoustic monitoring using A‐tag and SoundTrap was conducted from 2022 to 2024, with detections on 8.8% and 12.4% of monitoring days at ...
Satoko S. Kimura, Shunsuke Shizuka, Mayu I. Ogawa   +2 more
wiley   +1 more source

Maximum Angular Separation Epochs for Exoplanet Imaging Observations [PDF]

, 2018
Direct imaging of exoplanets presents both significant challenges and significant gains. The advantages primarily lie in receiving emitted and, with future instruments, reflected photons at phase angles not accessible by other techniques, enabling the ...
Kane, Stephen R., Meshkat, Tiffany, Turnbull, Margaret C.   +2 more
core   +3 more sources

High‐Latitude GPS Position Error During Substorms

Space Weather, Volume 24, Issue 6, June 2026.
Abstract Substorms produce rapid fluctuations in Global Navigation Satellite System (GNSS) signals, leading to degraded positioning performance at high latitudes. This study investigates the correlation of auroral structures on Global Positioning System (GPS) Precise Point Positioning (PPP) error during three substorm events with different strengths ...
Weixuan Liao, Yukitoshi Nishimura, Waqar Younas, Wen Li, Keith M. Groves, Eric F. Donovan, Vassilis Angelopoulos   +6 more
wiley   +1 more source

Estimations of changes of the Sun's mass and the gravitation constant from the modern observations of planets and spacecraft

, 2011
More than 635 000 positional observations (mostly radiotechnical) of planets and spacecraft (1961-2010), have been used for estimating possible changes of the gravitation constant, the solar mass, and semi-major axes of planets, as well as the value of ...
A.J. Hundhausen, A.J. Hundhausen, A.S. Brun, B.E. Gel’gaft, B.G. Marsden, B.G. Marsden, B.J. Gladman, C. Frohlich, C. Frohlich, E. V. Pitjeva, E.N. Polyakhova, E.V. Pitjeva, E.V. Pitjeva, E.V. Pitjeva, G.A. Krasinsky, G.G. Nyambuya, H. Jeans, H. Poincaré, International Astronomical Union, J.-Ph. Uzan, J.-Ph. Uzan, J.C. Brandt, J.G. Williams, J.K. Kevorkian, M.-B. Kallenrode, M.E. Bailey, N. P. Pitjev, P. Farinella, P.A.M. Dirac, T. Miura, W.C. Livingston, Z. Sekanina   +31 more
core   +1 more source

Solar Energetic Particle Prediction in the Inner Heliosphere Using Deep Learning and PSP/IS⊙IS Data

Journal of Geophysical Research: Machine Learning and Computation, Volume 3, Issue 3, June 2026.
Abstract Solar events, such as coronal mass ejections and solar flares, accelerate large numbers of energetic charged particles, producing solar energetic particle (SEP) events that can harm astronauts, damage satellites, and potentially damage infrastructure on Earth.
Tate Hutchins, Spiridon Kasapis, Hameedullah Farooki, Manuel E. Cuesta, Lengying Khoo, Sungmin Pak, Robert Czarnota, Jamie Rankin, Jamey Szalay, Zigong Xu, Georgios Livadiotis, Nikolaos Sarlis, David McComas   +12 more
wiley   +1 more source

First preliminary tests of the general relativistic gravitomagnetic field of the Sun and new constraints on a Yukawa-like fifth force from planetary data

, 2007
The general relativistic Lense-Thirring precessions of the perihelia of the inner planets of the Solar System are about 10^-3 arcseconds per century. Recent improvements in planetary orbit determination may yield the first observational evidence of such ...
Adelberger, Ashby, Barker, Bertolami, Bertotti, Ciufolini, Ciufolini, Ciufolini, Ciufolini, Cugusi, Damour, de Sitter, Dvali, Everitt, Everitt, Fienga, Fischbach, Fitch, Iorio, Iorio, Iorio, Iorio, Iorio, Iorio, Iorio, Krasinsky, L. Iorio, Lense, Lucchesi, Lucchesi, Lue, Mashhoon, Mecheri, Murphy, Newhall, Nordtevdt, Nordtvedt, Nordtvedt, Paternò, Pijpers, Pijpers, Pitjeva, Pitjeva, Reynaud, Ries, Ruggiero, Schiff, Sereno, Sereno, Sereno, Soffel, Standish, Stella, Thorne, Will   +54 more
core   +1 more source

Encoding Cumulation to Learn Perturbative Nonlinear Oscillatory Dynamics

Advanced Science, Volume 13, Issue 25, 4 May 2026.
Weak nonlinearities critically shape the long term behavior of oscillatory systems but are difficult to identify from data. A data‐driven framework is introduced to infer governing equations of weakly nonlinear oscillators from sparse and noisy observations.
Teng Ma, Ting‐Ting Gao, Wei Cui, Attilio Frangi, Gang Yan, Lin Zhao   +5 more
wiley   +1 more source

Constraining exotrojans in hot-Jupiter systems using transit timing variation observations from TESS

Astronomy & Astrophysics
Context. Co-orbital objects, also known as Trojans, are celestial bodies that share a 1:1 mean motion resonance orbit with a planet. Many planets in our Solar System hold Trojans, yet none has been confirmed in exoplanetary systems.
Zhang Zixin, Wang Wenqin, Ma Xinyue, Chen Zhangliang, Wang Yonghao, Yu Cong, Liu Shangfei, Gao Yang, Tang Baitian, Chen Dichang, Ma Bo   +10 more
doaj   +1 more source

A Cross‐Layer Spatial–Spectral Optimization Framework for Hybrid Routing and Load‐Balanced Channel Allocation in Intelligent Networks

Engineering Reports, Volume 8, Issue 5, May 2026.
Rapid 5G/6G evolution demands cross‐layer resource management to address congestion, latency, and reliability in multi‐hop wireless networks. This paper proposes a TOHRP–LBCA framework using DSA and congestion−/topology−/interference‐aware routing and channel allocation, yielding throughput gains, lower latency, improved packet delivery, and higher ...
Emmanuel Ahatsi, Oludolapo Olanrewaju
wiley   +1 more source

Linking ephemeris-derived outgassing forces to surface activity on comet Churyumov/Gerasimenko 67P: A comparative analysis of three post-Rosetta ephemerides

Astronomy & Astrophysics
Context. The non-gravitational acceleration (NGA) of comet 67P/Churyumov-Gerasimenko, primarily driven by outgassing, exhibits pronounced anisotropy due to the nucleus’s highly irregular and strongly asymmetric shape.
Yang Wanling, Yan Jianguo, Chen Min, Barriot Jean-Pierre   +3 more
doaj   +1 more source