Results 81 to 90 of about 137,822 (286)

A decametric wavelength radio telescope for interplanetary scintillation observations [PDF]

A phased array, electrically steerable radio telescope (with a total collecting area of 18 acres), constructed for the purpose of remotely sensing electron density irregularity structure in the solar wind, is presented.
Cronyn, W. M., Shawhan, S. D.
core   +1 more source

Variance Matrix Priors for Dirichlet Process Mixture Models With Gaussian Kernels

International Statistical Review, EarlyView.
Summary Bayesian mixture modelling is widely used for density estimation and clustering. The Dirichlet process mixture model (DPMM) is the most popular Bayesian non‐parametric mixture modelling approach. In this manuscript, we study the choice of prior for the variance or precision matrix when Gaussian kernels are adopted.
Wei Jing, Michail Papathomas, Silvia Liverani   +2 more
wiley   +1 more source

QUASAT: An orbiting very long baseline interferometer program using large space antenna systems [PDF]

, 1985
QUASAT, which stands for QUASAR SATELLITE, is the name given to a new mission being studied by NASA. The QUASAT mission concept involves a free flying Earth orbiting large radio telescope, which will observe astronomical radio sources simultaneously with
Freeland, R. E., Jordan, J. F., Levy, G. S., Potts, D. L.   +3 more
core   +1 more source

Sampling the volcanic plumes at Io: Impact speeds and shock conditions

Meteoritics &Planetary Science, EarlyView.
Abstract The desire to sample material from the interior of Io, by flying through its volcanic plumes, requires consideration of the flyby speed and the types of sample collection techniques that can be utilized. Low speed collection (1–2.5 km s−1) would require an orbit around Io itself, which is unlikely due to the accumulated radiation dose that ...
M. J. Burchell, R. C. Ogliore, P. J. Wozniakiewicz   +2 more
wiley   +1 more source

Spectral Analysis of ionospheric density variations measured with the large radio telescope in the Low-Latitude region [PDF]

, 2023
Sarvesh Mangla, Abhirup Datta
openalex   +1 more source

Spaceborne and spaceborn: Physiological aspects of pregnancy and birth during interplanetary flight

Experimental Physiology, EarlyView.
Abstract Crewed interplanetary return missions that are on the planning horizon will take years, more than enough time for initiation and completion of a pregnancy. Pregnancy is viewed as a sequence of processes – fertilization, blastocyst formation, implantation, gastrulation, placentation, organogenesis, gross morphogenesis, birth and neonatal ...
Arun V. Holden
wiley   +1 more source

New Radio Telescopes [PDF]

Highlights of Astronomy, 1986
AbstractNearly all of the exciting discoveries in radio astronomy have come from new instruments or techniques which have provided new frequencies, high sensitivity, higher spatial or time resolution, or improved image quality. Since the last General Assembly a number of major new radio telescopes have been completed while construction of others have ...
openaire   +1 more source

A new search for distant radio galaxies in the Southern hemisphere -- III. Optical spectroscopy and analysis of the MRCR--SUMSS sample

, 2009
We have compiled a sample of 234 ultra-steep-spectrum(USS)-selected radio sources in order to find high-redshift radio galaxies (HzRGs). The sample is in the southern sky at -40 deg < DEC < -30 deg which is the overlap region of the 408-MHz Revised ...
Allen, Allen, Antonucci, Appenzeller, Athreya, B. M. Gaensler, Baker, Baker, Barthel, Barthel, Becker, Bhatnagar, Bicknell, Binette, Binette, Blundell, Blundell, Blundell, Bock, Bornancini, Bower, Broderick, Brookes, Brookes, Bryant, Burgess, C. De Breuck, Carilli, Cohen, Condon, Croft, Croston, Croton, Cruz, De Breuck, De Breuck, De Breuck, De Breuck, De Breuck, De Breuck, De Lucia, Dekker, Dopita, Eales, El Bouchefry, Feulner, Fioc, Gillingham, H. M. Johnston, Hambly, Helfand, Hobbs, Hopkins, Hopkins, J. J. Bryant, J. W. Broderick, Jarvis, Kapahi, Kellermann, Klamer, Klamer, Kodama, Kurk, Kurk, Laing, Large, Lehnert, Lilly, Madau, Martini, Mauch, McCarthy, McCarthy, Nelson, Owen, Pentericci, Pentericci, Prestage, R. W. Hunstead, Rees, Reuland, Riley, Rocca-Volmerange, Rodgers, Röttgering, Seymour, Silk, Skrutskie, Springel, Stanford, Steidel, Thomas, Urry, van Breugel, van Ojik, Vanden Berk, Venemans, Venemans, Villar-Martín, Villar-Martín, White, Willott, Willott   +102 more
core   +1 more source

Time and phase alignment of distributed gateways: Theoretical analysis and experimental demonstration

International Journal of Satellite Communications and Networking, Volume 44, Issue 1, Page 47-59, January/February 2026.
The performance limitation in multiple‐input multiple‐output (MIMO) feeder links due to time and phase misalignment of the ground stations is investigated. Time and phase distribution over optical fiber is considered as an approach to achieve the synchronization requirements.
Eriserdi Mollaymeri, Thomas Delamotte, Andreas Knopp   +2 more
wiley   +1 more source

FIRST "Winged" and X-shaped Radio Source Candidates: II. New Redshifts

, 2008
We report optical spectroscopic observations of X-shaped radio sources with the Hobby-Eberly Telescope and Multiple-Mirror Telescope, focused on the sample of candidates from the FIRST survey presented in Paper I (Cheung 2007).
Adelman-McCarthy, Andrés Jordán, Bonning, C. C. Cheung, Cheung, Condon, de Koff, de Vaucouleurs, Fanaroff, Gijs Verdoes Kleijn, Hermine Landt, Komossa, Komossa, Leahy, Leahy, Lehár, Machalski, Miller, Monet, Owen, Rottmann, Saripalli, Schlegel, Stephen E. Healey, Tadhunter, Ulrich, Urry, Zirbel   +27 more
core   +1 more source