Results 41 to 50 of about 27,177 (193)

First e-VLBI observations of GRS 1915+105

, 2006
We present results from the first successful open call e-VLBI science run, observing the X-ray binary GRS 1915+105. e-VLBI science allows the rapid production of VLBI radio maps, within hours of an observation rather than weeks, facilitating a decision ...
Campbell, R. M., Casey, S., Fender, R. P., Garrett, M. A., Miller-Jones, J. C. A., Paragi, Z., Pooley, G. G., Reynolds, C., Rushton, A., Spencer, R. E., Strong, M., Szomoru, A., Tudose, V.   +12 more
core   +1 more source

Wide-field VLBI imaging

New Astronomy Reviews, 1999
6 pages, 3 figures, accepted by New Astronomy Reviews, EVN/JIVE Symposium Special ...
Garrett, M. A., Porcas, R. W., Pedlar, A., Muxlow, T. W. B., Garrington, S. T.   +4 more
openaire   +2 more sources

РАДИОСТРУКТУРА ИСТОЧНИКА 1803÷784

Odessa Astronomical Publications, 2011
Results of processing of data of ground-space VLBI experiment titled V053 are presented. These observations were made in 1997 October with 10 antennas of American interferometer VLBA and with Japan space telescope VSOP (VLBI Space Orbit Program).
A. А. Чуприков
doaj   +1 more source

Simultaneous radio-interferometric and high-energy TeV observations of the gamma-ray blazar Mkn 421

, 2006
The TeV-emitting BL Lac object Mkn 421 was observed with very long baseline interferometry (VLBI) at three closely-spaced epochs one-month apart in March-April 1998.
Aharonian, B. Degrange, Bai, Barrau, Biermann, Blandford, Bucciferro, Bååth, Cawthorne, Celotti, Cui, D. C. Gabuzda, F. Piron, Fossati, Gabuzda, Gabuzda, Gaidos, Georganopoulos, Georganopoulos, Ghisellini, Ghisellini, H. Sol, Katarzynski, Kellermann, Kellermann, Kollgaard, Konopelko, Krawczynski, Le Bohec, Lin, Maraschi, Marscher, Marscher, Napier, Otterbein, P. Charlot, Phillips, Piner, Piner, Piner, Piron, Pohl, Polatidis, Pollack, Punch, Quinn, Sambruna, Takahashi, Unwin, Urry, Valtaoja, Wehrle, Wehrle, Witzel, Xu, Zensus, Zhang, Zhang   +57 more
core   +3 more sources

A History of UNAVCO: Four Decades of Advancing Geodesy

Perspectives of Earth and Space Scientists, Volume 6, Issue 1, December 2025.
Abstract UNAVCO was a university‐governed consortium funded by the National Science Foundation (NSF), with support from the National Aeronautics and Space Administration (NASA) and the United States Geological Survey (USGS), to support geoscience research and education using geodesy.
Emily E. Zawacki, Donna J. Charlevoix, Charles M. Meertens, Jeffrey T. Freymueller, Tonie van Dam   +4 more
wiley   +1 more source

Zooming towards the Event Horizon - mm-VLBI today and tomorrow [PDF]

, 2013
Global VLBI imaging at millimeter and sub-millimeter wavelength overcomes the opacity barrier of synchrotron self-absorption in AGN and opens the direct view into sub-pc scale regions not accessible before.
Alef, W., Angelakis, E., Bertarini, A., Blundell, R., Bremer, M., Doeleman, S., Fish, V., Freund, R., Fuhrmann, L., Hodgson, J. A., Jorstad, S. G., Karamanavis, V., Krichbaum, T. P., Marrone, D., Marscher, A. P., Rottmann, H., Roy, A., Sanchez, S., Strittmatter, P., Wagner, J., Weintroub, J., Young, K., Zensus, J. A., Ziurys, L.   +23 more
core  

An Experiment on Radio Location of Objects in the Near-Earth Space with VLBI in 2012

Open Astronomy, 2013
An experiment on radar location of space debris objects using of the method of VLBI was carried out in April, 2012. The radar VLBI experiment consisted in irradiation of some space debris objects (4 rocket stages and 5 inactive satellites) with a signal ...
Nechaeva M., Antipenko A., Bezrukovs V., Bezrukov D., Dementjev A., Dugin N., Konovalenko A., Kulishenko V., Liu X., Nabatov A., Nesteruk V., Pupillo G., Reznichenko A., Salerno E., Shmeld I., Shulga O., Sybiryakova Y., Tikhomirov Yu., Tkachenko A., Volvach A., Yang W.-J.   +20 more
doaj   +1 more source

Comparison of VLBI, TV and traveling clock techniques for time transfer [PDF]

, 1982
A three part experiment was conducted to develop and compare time transfer techniques. The experiment consisted of (1) a very long baseline interferometer (VLBI), (2) a high precision portable clock time transfer system between the two sites, and (3) a ...
Angerhofer, P. E., Johnston, K. J., Kaplan, G. M., Klepczynski, W. J., Matsakis, D. N., Santini, N. J., Spencer, J. H., Waltman, E. B.   +7 more
core   +1 more source

A new method for estimating frequency-dependent core shifts in active galactic nucleus jets [PDF]

, 2011
We discuss the opacity in the core regions of active galactic nuclei observed with Very Long Baseline Interferometry (VLBI), and describe a new method for deriving the frequency-dependent shifts of the VLBI core from the frequency-dependent time lags of ...
Aller, H. D., Aller, M. F., Gabuzda, D. C., Kudryavtseva, N. A.   +3 more
core   +3 more sources

Globally Critical Infrastructure: The Unique Risks and Challenges

Risk Analysis, Volume 45, Issue 12, Page 4804-4817, December 2025.
ABSTRACT Critical infrastructure is typically identified at the national level. However, disruption to certain infrastructure systems, facilities, and assets can have negative consequences for global societies. Such globally critical infrastructure entails a distinct risk profile for both countries dependent on the infrastructure, and countries that ...
Zachary Kallenborn, Henry H. Willis
wiley   +1 more source