Zobrazeno 1 - 10
of 25
pro vyhledávání: '"Albert Greve"'
Autor:
B. Foullieux, W. Brunswig, Albert Greve, S. Navarro, K. F. Schuster, Albrecht Sievers, B. Lazareff, D. John, Clemens Thum, Helmut Wiesemeyer, A. Perrigouard, J.-Y. Chenu, M. Carter, C. Boucher, J. L. Pollet
Publikováno v:
Astronomy & Astrophysics. 423:1171-1177
We describe the technical concept, properties, and performance of HERA (HEterodyne Receiver Array) at the IRAM 30 m telescope. HERA is a multibeam, waveguide SIS receiver that greatly improves mapping speed in various ob- serving modes and also provi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1dae2956651382289d82c0e4d6d84e97
https://doi.org/10.1051/0004-6361:20034179
https://doi.org/10.1051/0004-6361:20034179
Autor:
Thomas P. Krichbaum, S. Urpo, S. Navarro, D. A. Graham, P. Könönen, J. A. Zensus, K. Wiik, Albert Greve, J. Peltonen, John Conway, Michael Grewing, P. Sjöman, Roy Booth, Ari Mujunen, Jouko Ritakari, M. Berton, F. Rantakyro, D. John, E. Oinaskallio
Publikováno v:
Astronomy & Astrophysics. 390:L19-L22
We report a successful VLBI observation at 147 GHz (2.1 mm) on the 3 100 km long baseline between the telescopes at Metsahovi (Finland) and Pico Veleta (Spain). The sources 3C 273B and 3C 279 were detected with a SNR of∼10. For these sources we est
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ce5105b8dd0a97b1ff53e8bc8053bfe7
https://doi.org/10.1051/0004-6361:20020893
https://doi.org/10.1051/0004-6361:20020893
Autor:
Albert Greve, Michael Bremer
Publikováno v:
Integrated Modeling of Complex Optomechanical Systems.
In earlier work we have described the thermal modelling for design and control of a fully insulated, and sometimes ventilated, high precision radio telescope. For such an insulated telescope the modelling of the time-variable dynamic influence of the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0fe881eb8b2ab2fcb9e89c445993f608
https://doi.org/10.1117/12.915584
https://doi.org/10.1117/12.915584
Autor:
Michael Bremer, Albert Greve
Publikováno v:
Thermal Design and Thermal Behaviour of Radio Telescopes and their Enclosures ISBN: 9783642038662
Radio telescopes are built for observations frommeter to sub-millimeter wavelengths (Table 1.1). The steerable telescopes have a parabolic reflector of 10–100–m diameter and the optics can be designed for observations in primary focus, Cassegrain
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6399af08ad9948125d5068cb07971cc4
https://doi.org/10.1007/978-3-642-03867-9_15
https://doi.org/10.1007/978-3-642-03867-9_15
Autor:
Albert Greve, Michael Bremer
Publikováno v:
Thermal Design and Thermal Behaviour of Radio Telescopes and their Enclosures ISBN: 9783642038662
Solar radiation is the most disturbing external heat source. With solar radiation incident on the ground between approximately 300 and 1000Wm-2, a white painted telescope or enclosure surface will absorb approximately 50–300Wm-2. This power will he
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::24c6cb79766e3d314c3da604e071d51f
https://doi.org/10.1007/978-3-642-03867-9_5
https://doi.org/10.1007/978-3-642-03867-9_5
Autor:
Michael Bremer, Albert Greve
Publikováno v:
Thermal Design and Thermal Behaviour of Radio Telescopes and their Enclosures ISBN: 9783642038662
A significant radiative coupling can occur between the outer surfaces of a telescope, and enclosure, and the sky and the ground. This radiative coupling is illustrated in Fig. 8.1 for the IRAM 30-m telescope. In the left picture, the telescope is at
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::53bb3eba4e3d9b3ba931a9b6d03e9531
https://doi.org/10.1007/978-3-642-03867-9_8
https://doi.org/10.1007/978-3-642-03867-9_8
Autor:
Albert Greve, Michael Bremer
Publikováno v:
Thermal Design and Thermal Behaviour of Radio Telescopes and their Enclosures ISBN: 9783642038662
The elaborate technical efforts in the construction of radio telescopes and communication antennas are undertaken to obtain a clean beam and the best power sensitivity. This merits an explanation of the beam (image) formation of a telescope/antenna,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a9db0394e86314286958241d915fef96
https://doi.org/10.1007/978-3-642-03867-9_12
https://doi.org/10.1007/978-3-642-03867-9_12
Autor:
Michael Bremer, Albert Greve
Publikováno v:
Thermal Design and Thermal Behaviour of Radio Telescopes and their Enclosures ISBN: 9783642038662
The temperature (T) and the temperature change with time (∂T/∂t) are the basic parameters in the discussion of the thermal behavior of a structural component. The temperature of a component defines, on the one hand, the heat transfer to other com
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::60960b5b6f1bac66a1fcfef455732d06
https://doi.org/10.1007/978-3-642-03867-9_6
https://doi.org/10.1007/978-3-642-03867-9_6
Autor:
Albert Greve, Michael Bremer
Publikováno v:
Thermal Design and Thermal Behaviour of Radio Telescopes and their Enclosures ISBN: 9783642038662
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::91f99291a2adc173f3381463daf73628
https://doi.org/10.1007/978-3-642-03867-9_13
https://doi.org/10.1007/978-3-642-03867-9_13
Autor:
Michael Bremer, Albert Greve
Publikováno v:
Thermal Design and Thermal Behaviour of Radio Telescopes and their Enclosures ISBN: 9783642038662
Although the specific thermal aspects under discussion may be different for a radio telescope and an optical telescope, for instance concerning, on the one hand, the thermal stability of the reflector backup structure and, on the other hand, temperat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1001005eb88cb15d5495ef8c07ecff25
https://doi.org/10.1007/978-3-642-03867-9_14
https://doi.org/10.1007/978-3-642-03867-9_14