Results 41 to 50 of about 5,542,325 (204)

Linking the Variation of Sediment Accumulation Rate to Short Term Sea-Level Change Using Cyclostratigraphy: Case Study of the Lower Berriasian Hemipelagic Sediments in Central Tunisia (Southern Tethys)

Frontiers in Earth Science, 2021
High-resolution magnetic susceptibility and % CaCO3 records (5 to 10 cm sampling interval) are used to track astronomical cycles from a Lower Berriasian record from central Tunisia.
Hamdi Omar, Hamdi Omar, Anne-Christine Da Silva, Chokri Yaich, Chokri Yaich   +4 more
doaj   +1 more source

Optimizing Structural Parameters and Layout of Fiber Positioners with the Whale Optimization Algorithm for LAMOST

The Astronomical Journal
Robotic fiber positioner (RFP) arrays are essential for multiobject spectroscopic telescopes. To improve the survey efficiency, they are densely arranged on the focal planes with overlapped patrol areas, guaranteeing full coverage and increasing the ...
Zengxiang Zhou, Jiahao Zhou, Baolong Chen, Jianping Wang, Zhigang Liu, Hongzhuan Hu, Feifan Zhang   +6 more
doaj   +1 more source

Astronomia ex machina: a history, primer and outlook on neural networks in astronomy

Royal Society Open Science, 2023
In this review, we explore the historical development and future prospects of artificial intelligence (AI) and deep learning in astronomy. We trace the evolution of connectionism in astronomy through its three waves, from the early use of multilayer ...
Michael J. Smith, James E. Geach
doaj   +1 more source

Bayesian Doppler Imaging: Simultaneous Inference of Surface Maps and Geometric Parameters

The Astrophysical Journal
We present a fully Bayesian, pixel-based Doppler imaging framework that enables the simultaneous inference of surface brightness maps and geometric parameters, including the inclination i and equatorial rotation velocity v _rot , from high-resolution ...
Yamato Ureshino, Hajime Kawahara, Hibiki Yama, Kento Masuda   +3 more
doaj   +1 more source

Empirical modeling of tropospheric delays with uncertainty [PDF]

Geoscientific Model Development
Accurate modeling of tropospheric delay is important for high-precision data analysis of space geodetic techniques, such as the Global Navigation Satellite System (GNSS).
J. Wang, J. Wang, J. Wang, J. Chen, J. Chen, J. Chen, Y. Zhang   +6 more
doaj   +1 more source

The Influence of Acquisition Techniques on the Compilation of Astronomical Data [PDF]

International Astronomical Union Colloquium, 1977
With the increasing use of electronic rather than photographic data collection, and on-line minicomputers at the telescope, two factors will necessitate a reconsideration of the way in which data are stored at the telescope.1) Many of the electronic data collecting methods produce data in a final or semifinal (digital) form and usually with a large ...
openaire   +1 more source

A Hierarchical Point-spread Function Reconstruction Method

The Astrophysical Journal
Reconstruction of the point-spread function (PSF) plays an important role in many areas of astronomy, including photometry, astrometry, galaxy morphology, and shear measurement.
Pedro Alonso, Jun Zhang, Cong Liu
doaj   +1 more source

Primary beam calibration for commensal telescopes utilizing offset optics

Frontiers in Astronomy and Space Sciences
IntroductionAccurate primary beam calibration is essential for precise brightness measurements in radio astronomy. The VLA Low-band Ionosphere and Transient Experiment (VLITE) faces challenges in calibration due to the offset Cassegrain optics used in ...
Emil Polisensky, Tracy E. Clarke, Simona Giacintucci, Wendy Peters   +3 more
doaj   +1 more source

EMU:Evolutionary Map of the Universe [PDF]

, 2011
EMU is a wide-field radio continuum survey planned for the new Australian Square Kilometre Array Pathfinder (ASKAP) telescope. The primary goal of EMU is to make a deep (rms ∼10Jy/beam) radio continuum survey of the entire Southern sky at 1.3GHz ...
Ian Smail, Röttgering, H., Mao, Minnie Y., Feain, I, Hopkins, A., Pimbblet, K. A., Norris, Ray P. (R17893), Jarvis, Matthew, Jackson, C., Lopez-Sanchez, Angel R., E. Ibar, D. Bacon, I. Feain, Hopkins, Andrew M., B. S. Koribalski, Messias, H., J. V. Wall, Ibar, E., Urquhart, J. S., Alexander, D.M., Saikia, D.J., Thompson, M., Thompson, Mark, Hopkins, AM, O. B. Slee, Brown, S., Brown, S, Jarvis, Matt J., E. Lenc, Ivison, R., Thompson, MA, Umana, G, Eales, S, Afonso, J, Afonso, J., Reiprich, T.H., Mao, M. Y., Brown, MJI, Edge, A. C., Andernach, H., Sharp, R.G., Umana, Grazia, S. Eales, Alexander, David M., Hollow, R, Messias, H, D. M. Alex, Pimbblet, Kevin A., Sharp, R. G., Johnston-Hollitt, M., R€ottgering, H., Jarvis, M.J., Bacon, David, Ciliegi, P., Hollow, R., M. Jarvis, H. Andernach, I. G. Roseboom, Lenc, A., Middelberg, E, J. J. Condon, H. Röttgering, Umana, Grazia M., Rudnick, Lawrence R., P. Hancock, Padovani, P., Murphy, T., Dunne, L., Roettgering, H, M. A. Thompson, Zhao, G.-B., Brown, Michael J. I., Smail, I., Murphy, T, Lenc, Emil, Rottgering, Huub J. A., Dunne, L, M. T. Huynh, Huynh, Minh T., Urquhart, J., P. Ciliegi, Brown, M.J.I., Padovani, P, Prandoni, Isabella, Condon, J., Jarvis, M., Raccanelli, A, M. Johnston-hollitt, Umana, G., Middelberg, Enno, Randall, K. E., Afonso, Jose M., Zhao, G. -B., Appleton, P. N., N. Seymour, Kimball, A., Zhao, Gong-Bo, Urquhart, J.S., Bacon, D., Hopkins, A. M., Becker, W, Koribalski, B.S., Rudnick, L., Roseboom, I., Kimball, AE, López-Sánchez, Á. R., Norris, R.P., A. C. Edge, Reiprich, T., Johnston-Hollitt, M, D. J. Saikia, Saikia, D. J., T. H. Reiprich, Slee, O. B., Ciliegi, P, G. Giovannini, Hopkins, A.M., Padovani, Paolo, Norris, Ray P., Edge, A., Reiprich, TH, L. Dunne, Sharp, RG, Condon, J. J., Urquhart, JS, J. S. Urquhart, Kennicutt, R., Giovannini, G., Alexander, D. M., Koekemoer, A.M., B. M. Gaensler, Randall, K., Condon, JJ, Edge, AC, Seymour, Nick, Pimbblet, K.A., Ivison, R.J., Rttgering, H., Sharp, R., Randall, K.E., Brown, M., Roseboom, IG, Koribalski, B. S., I. G. Roseboom H. Röttgering, Kennicutt, R, Smail, I, K. E. Randall, I. Pr, Randall, KE, Jarvis, M, I. Prandoni, Prandoni, I, Mao, M.Y., Appleton, PN, Alexander, D., Rudnick, L, Roseboom, I.G., Feain, I., Jackson, Carole, S. Brown, Bacon, D, Feain, Ilana J., C. A. Hales, Roseboom, I. G., Eales, S., Reiprich, T. H., Brown, M. J. I., Roseboom, Isaac G., Ray P. Norris, Mao, MY, Condon, James J., H. Messias, Hollow, Robert P., Jackson, C, Koribalski, BS, C. Jackson, Hales, C. A., Prandoni, I., Seymour, N, Edge, A.C., Banfiled, J., Á. R. López-Sánchez, M. Y. Mao, Appleton, Philip N., Mao, M., Wall, J. V., E. Middelberg, J. Banfield, Kimball, Amy E., Amy E, Andernach, Heinz, Koribalski, Baerbel S., Amy E. Kimball, Afonso, Jose, W. Becker, Zhao, G., Eales, Stephen Anthony, Wall, J.V., Zhao, G-B, López-Sá&nchez, Á.R., Roettgering, H., Lpez-Snchez, R., Huynh, M. T., G.-B. Zhao, Lenc, E, Lopez-Sanchez, AR, Raccanelli, A., Alexander, DM, R. Kennicutt, Appleton, P., A. M. Hopkins, Edge, Alastair C., Gaensler, B.M., J. Afonso, Thompson, M. A., Smail, Ian, M. Y. Huynh, Thompson, M.A., R. G. Sharp, Lopez-Sanchez, A., Ibar, E, Sharp, Robert G., Hales, C.A., Norris, RP, Slee, O., Wall, J., Johnston-Hollitt, Melanie, Raccanelli, Alvise, A. M. Koekemoer, Hancock, P, T. Murphy, Ivison, R. J., A. Raccanelli, G. -b. Zhao, P. N. Appleton, Andernach, H, Gaensler, B. M., Huynh, M.T., Norris, R., Seymour, N., Kimball, A.E., R. J. Ivison, Huynh, MT, Wall, JV, Slee, OB, M. J. I. Brown, Dunne, Loretta, Gaensler, B., Hancock, P., R. Hollow, Hales, CA, Messia, H., P. Padovani, G. Umana, Saikia, DJ, Middelberg, E., Becker, W., Ivison, RJ, Appleton, P.N., Hales, C., Koekemoer, AM, K. A. Pimbblet, Banfield, J., Banfield, J, Pimbblet, KA, L. Rudnick, Lenc, E., Condon, J.J., D. M. Alexander, Gaensler, BM, Brown, Shea D., Koribalski, B., Huynh, M., Y. Mao, Saikia, D., Slee, O.B., Pimbblet, K., Koekemoer, A., Koekemoer, A. M., Giovannini, G   +279 more
core   +1 more source

The Digitization of Photographic Spectra in the Dominion Astrophysical Observatory Plate Collection with Commercial Scanners: A Pilot Study

The Astronomical Journal
Commercial flatbed scanners have the potential to deliver a quick and efficient means of capturing the scientific content of spectra recorded on photographic plates.
T. J. Davidge
doaj   +1 more source