Results 171 to 180 of about 5,542,325 (204)

Structural design techniques applied in astronomical instruments

Ground-based and Airborne Telescopes VII, 2018
We present in this article some of the techniques applied at the Instituto de Astronomia of the Universidad Nacional Autonoma de Mexico (IA-UNAM) to the mechanical structural design for astronomical instruments. With this purpose we use two recent projects developed by the Instrumentation Department.
Tinoco, Silvio J, Tejada, Carlos, Quirós, Fernando, Floriot, J, Corre, D, Ferrari, M, Hugot, E, Dohlen, K, Platzer, J, Klotz, A, Attéia, J.L, Boy, J, Ambert, P, Le Borgne, J.F, Dornic, D, Cordier, B, Ronayette, S, Blanc, P.E, Farah, Alejandro S, Watson, Alan M, Cuevas Cardona, Salvador, Fuentes-Fernández, Jorge, Ángeles, Fernando, Langarica, Rosaliá, Ruíz-Diáz-Soto, Jaime, Marcos, M, Basa, S, Pallier, E, Valentin, H, Mathon, R, Meessen, C, Ageron, M, Boulade, O, Dubreuil, D, Gallais, P, Le van Suu, A, Dolon, F   +36 more
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A Survey on GPU Techniques in Astronomical Data Processing

2013 International Conference on Computer Sciences and Applications, 2013
When GeForce256 was issued in 1999, NVIDIA first proposes the concept of GPU (Graphics Processor Unit), and then a large number of complex application requirements make the whole industry flourishing. This paper first presents the development of GPU, and then briefly introduces and compares two popular development platform of GPU: CUDA (Compute Unified
Meng Xiao, Hui Deng, Feng Wang, Kaifan Ji   +3 more
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Speckle Interferometric Technique for Astronomical Observations

Journal of Optics, 2003
The speckle imaging is a photographic technique that resolves objects viewed through severely distorted media. The results are insensitive to the errors caused by apparent size of the isoplanatic patch and the telescope aberrations. In this paper, a short descriptions of the atmospheric turbulence and its effect on the flat wavefront from a stellar ...
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Calibration techniques for next-generation astronomical systems

SPIE Proceedings, 2006
Historically, few astronomical measurements have required sub-percent accuracy in photometry. Measuring SNIa fluxes in order to determine cosmological parameters, however, often requires the comparison of images from different telescopes, and at different redshifts. This can introduce a myriad of sources of error.
S. Slater, C. W. Stubbs, J. L. Tonry, J. R. Masiero, R. C. Smith   +4 more
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Data Reduction Techniques for Direct Astronomical Electronography

1972
Publisher Summary This chapter discusses the data reduction techniques for direct astronomical electronography. There are a number of ways in which the retrieval of information from the Spectracon exposure can be attempted. A preliminary analysis showed that the shape of the star profile was not strongly dependent on the star's intensity. It is found
M.J. Cullum, C.L. Stephens
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Optical technique for inner-scale measurement: possible astronomical applications

Applied Optics, 1997
We propose an optical technique that allows us to estimate the inner scale by measuring the variance of angle of arrival fluctuations of collimated laser beams of different sections w (i) passing through a turbulent layer. To test the potential efficiency of the system, we made measurements on a turbulent air flow generated in the laboratory, the ...
E, Masciadri, J, Vernin
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A Rapid Computer Search Technique for Astronomical Catalogs

Publications of the Astronomical Society of the Pacific, 1964
During 1963 Hynek and Crull put a modified form of the Yale Catalogue of Bright Stars on punched cards. The writer has used a scan program to convert these cards to a binary tape, i.e., a tape on which the data are in a form immediately usable by the computer.
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Investigation of Techniques to Determine Astronomical Aeeing Conditions at Matjiesfontein

11th SAGA Biennial Technical Meeting and Exhibition, 2009
A new fundamental space geodetic observatory for South Africa has been proposed. Matjiesfontein in the Karoo has been identified as a suitable site for locating the proposed new fundamental space geodetic observatory. Lunar Laser Ranging (LLR) is one of the space geodetic techniques to be hosted on-site.
M. Nickola, R. Botha, W.L. Combrinck
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Analysis of RHESSI Flares Using aRadio Astronomical Technique

Solar Physics, 2007
We have used Ramaty High Energy Solar Spectroscopic Imager (RHESSI) modulation profiles in the 25 – 300 keV range to construct high-fidelity visibilities of 25 flares having at least two components. These hard X-ray visibilities, which are mathematically identical to the visibilities of radio imaging, were input to software developed for mapping solar ...
E. J. Schmahl, R. L. Pernak, G. J. Hurford, J. Lee, S. Bong   +4 more
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A cable retrieval technique for an orbiting astronomical observatory

Control and Flight Dynamics Conference, 1968
Cable retrieval and attitude control technique for passive orbiting astronomical observatory tethered to orbiting space ...
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