Results 281 to 290 of about 1,798,975 (310)

Spectral contents of astronomical unequally spaced time-series: contribution of time-frequency and time-scale analyses

2003 IEEE International Conference on Acoustics, Speech, and Signal Processing, 2003. Proceedings. (ICASSP '03)., 2004
We analyze how time-scale and time-frequency methods can be suited to study unequally spaced astronomical time-series, in terms of recovering precise spectral contents of a pulsating star. In many situations in astronomy, nonuniform sampling proves to be the natural way in which the signal is available for investigation and the spectral information of ...
S. Roques, C. Thiebaut
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Astronomical frequencies for climate research at the decadal to century time scale

Climate Dynamics, 1992
Short-term variations of the elements representing the Earth's motion around the Sun and its rotation have been analyzed over the last 6000 years using 1-year steps. Their low-frequency part is compared first to the values obtained from a secular theory of the planetary long-term motion showing that they can be considered reliable enough to represent ...
MF Loutre, A Berger, P Bretagnon, P-L Blanca   +3 more
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Astronomic calibration of the late Oligocene through early Miocene geomagnetic polarity time scale

Earth and Planetary Science Letters, 2004
At Ocean Drilling Program (ODP) Site 1090 (subantarctic South Atlantic), benthic foraminiferal stable isotope data (from Cibicidoides and Oridorsalis) span the late Oligocene through early Miocene (f24-16 Ma) at a temporal resolution of f5 ky. Over the same interval, a magnetic polarity stratigraphy can be unequivocally correlated to the geomagnetic ...
Billups, K., Pälike, H., Channell, J., Zachos, J., Shackleton, N.J.   +4 more
openaire   +2 more sources

Astronomical forcing in Upper Miocene continental sequences: implications for the Geomagnetic Polarity Time Scale

Earth and Planetary Science Letters, 2004
Abstract We present an integrated stratigraphic study of cyclically bedded distal alluvial fan to lacustrine deposits in the late Miocene continental sections of Cascante and Canizar (Teruel basin, NE Spain). The cyclostratigraphic analysis reveals that different scales of sedimentary cyclicity are present with a thickness ratio of about 1:2:5 ...
Abdul Aziz, H., van Dam, Jan A., Hilgen, F.J., Krijgsman, W.   +3 more
openaire   +2 more sources

Evaluation of the astronomically calibrated time scale for the Late Pliocene and Earliest Pleistocene

Paleoceanography, 1993
An astronomically calibrated time scale was recently established (Hilgen, 1991a, b) for the Pliocene and earliest Pleistocene, based on the correlation of dominantly precession‐controlled sedimentary cycles (sapropels and CaCO3 cycles) in Mediterranean deep‐sea sections to astronomical solution Ber90 (Berger and Loutre, 1991).
F. J. Hilgen, L. J. Lourens, A. Berger, M. F. Loutre   +3 more
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Astronomical Systems of Units, Co-Ordinates and Time-Scales

1973
The systems of units, co-ordinates and time-scales that are currently in use in dynamical astronomy are reviewed, and attention is drawn to the needs for simplification and clarification, and for explicit statements of the relationships between astronomical and SI units.
openaire   +1 more source

The Multimodal Universe: Enabling Large-Scale Machine Learning with 100 TB of Astronomical Scientific Data

Neural Information Processing Systems
We present the MULTIMODAL UNIVERSE, a large-scale multimodal dataset of scientific astronomical data, compiled specifically to facilitate machine learning research.
The Multimodal Universe Collaboration. Eirini Angeloudi, Jeroen Audenaert, Micah Bowles, B. M. Boyd, David Chemaly, B. Cherinka, Ioana Ciucua, Miles Cranmer, Aaron Do, M. Grayling, E. Hayes, Tom Hehir, Shirley Ho, M. Huertas-Company, Kartheik G. Iyer, Maja Jabłońska, François Lanusse, Henry W. Leung, K. Mandel, J. R. Mart'inez-Galarza, Peter Melchior, Lucas Meyer, L. Parker, Helen Qu, Jeff Shen, Michael J. Smith, Connor Stone, Mike Walmsley, John F. Wu   +28 more
semanticscholar   +1 more source

A 65-Myr-Long Astronomical Time Scale for the Mesozoic Deep-Sea Sequence (Inuyama, Japan): Implications for the Triassic–Jurassic Time Scale

2014
The astronomical time scale (ATS) for geological records is nearly complete for Cenozoic strata, and attempts have been made to extend the scale to Mesozoic and older ages. However, construction of the Mesozoic ATS is hampered by the chaotic behaviour of solar planets and the lack of a continuous pelagic sequence for the early Mesozoic due to the ...
Masayuki Ikeda, Ryuji Tada, Hironobu Sakuma   +2 more
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FALCO: Foundation Model of Astronomical Light Curves for Time Domain Astronomy. Implementation and Applications on Kepler Data

Astronomical Journal
Time-domain surveys have advanced astronomical research by revealing diverse variable phenomena, from stellar flares to transient events. The scale and complexity of survey data, along with the demand for rapid classification, present significant ...
Xiaoxiong Zuo, Yihan Tao, Yang Huang, Zhixuan Kang, Huaxi Chen, C. Cui, Jiashu Pan, Xiao Kong, Yuan-Sen Ting, Xiaoyu Tang, Henggeng Han, Haiyang Mu, Yunfei Xu, Dongwei Fan, G. Xue, Ali Luo, Jifeng Liu   +16 more
semanticscholar   +1 more source

From Chaos to Clarity: Time Series Anomaly Detection in Astronomical Observations

IEEE International Conference on Data Engineering
With the development of astronomical facilities, large-scale time series data observed by these facilities is being collected. Analyzing anomalies in these astronomical observations is crucial for uncovering potential celestial events and physical ...
Xinli Hao, Yile Chen, Chen Yang, Zhihui Du, Chaohong Ma, Chao Wu, Xiaofeng Meng   +6 more
semanticscholar   +1 more source