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  • 1
    Online Resource
    Online Resource
    Detection of GRBs and OTs by All-Sky Optical and SID Monitors
    Hindawi Limited ; 2010
    In:  Advances in Astronomy Vol. 2010 ( 2010), p. 1-8
    Details
    In: Advances in Astronomy, Hindawi Limited, Vol. 2010 ( 2010), p. 1-8
    Abstract: We report on two alternative simple methods to detect counterparts of cosmic gamma-ray bursts (GRBs) and optical transients (OTs). We report on the development and tests of an alternative optical all-sky monitor recently tested at the Karlovy Vary Observatory. The monitor is based on a Peleng 8 mm fish-eye lens (1 : 3,5–1 : 16) and CANON EOS 350D digital CCD camera. This type of monitor represents a low-cost device suitable for easy replication and still able to detect brighter optical transients simultaneously to GRB triggers. Such OTs have been observed for some of the GRBs such as GRB990123, GRB060117, or recently GRB080319 indicating that some fraction of GRBs can generate optical transient emission accessible by simple small aperture instrumentation as described here. These efforts are accompanied by development of dedicated programmes to access and to evaluate all-sky images; these efforts will be also briefly described. The All-Sky Monitor is a space variant optical system and its point spread function (PSF) has not uniform shape in the field of view. The processing and measuring of image data is complicated, and sophisticated deconvolution algorithms are used for image restoration. The second method is the GRB detection based on their ionospheric response.
    Type of Medium: Online Resource
    ISSN: 1687-7969 , 1687-7977
    URL: Article
    DOI: 10.1155/2010/428943
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2010
    detail.hit.zdb_id: 2448869-0
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  • 2
    Online Resource
    Online Resource
    Advanced Processing of Images Obtained from Wide-field Astronomical Optical Systems
    Czech Technical University in Prague - Central Library ; 2011
    In:  Acta Polytechnica Vol. 51, No. 1 ( 2011-01-01)
    Details
    In: Acta Polytechnica, Czech Technical University in Prague - Central Library, Vol. 51, No. 1 ( 2011-01-01)
    Abstract: The principal aim of this paper is to present a general view of the special optical systems used for acquiring astronomical image data, commonly referred to as WFC or UWFC (Ultra Wide Field Camera), and of their transfer characteristics. UWFC image data analysis is very difficult in general, not only because the systems have so-called space variant (SV) properties. Images obtained from UWFC systems are usually incorrectly presented due to a wide range of optical aberrations and distortions. The influence of the optical aberrations increases towards the margins of the field of view. These aberrations distort the point spread function of the optical system and rapidly cut the accuracy of the measurements. This paper deals with simulation and modelling of the UWFC optical systems used in astronomy and their transfer characteristics.
    Type of Medium: Online Resource
    ISSN: 1805-2363 , 1210-2709
    URL: Article
    DOI: 10.14311/1334
    Language: Unknown
    Publisher: Czech Technical University in Prague - Central Library
    Publication Date: 2011
    detail.hit.zdb_id: 2575330-7
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  • 3
    Online Resource
    Online Resource
    Response of cultured tissue cells to homologous and heterologous blood group substances
    Springer Science and Business Media LLC ; 1966
    In:  Blut Zeitschrift für die Gesamte Blutforschung Vol. 14, No. 3 ( 1966-12), p. 137-149
    Details
    In: Blut Zeitschrift für die Gesamte Blutforschung, Springer Science and Business Media LLC, Vol. 14, No. 3 ( 1966-12), p. 137-149
    Type of Medium: Online Resource
    ISSN: 0006-5242 , 1432-0584
    URL: Article
    DOI: 10.1007/BF01631535
    RVK:
    XA 10000
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 1966
    detail.hit.zdb_id: 1458429-3
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  • 4
    Online Resource
    Online Resource
    Space Variant PSF – Deconvolution of Wide-Field Astronomical Images
    Czech Technical University in Prague - Central Library ; 2008
    In:  Acta Polytechnica Vol. 48, No. 3 ( 2008-01-03)
    Details
    In: Acta Polytechnica, Czech Technical University in Prague - Central Library, Vol. 48, No. 3 ( 2008-01-03)
    Abstract: The properties of UWFC (Ultra Wide-Field Camera) astronomical systems along with specific visual data in astronomical images contribute to a comprehensive evaluation of the acquired image data. These systems contain many different kinds of optical aberrations which have a negatively effect on image quality and imaging system transfer characteristics, and reduce the precision of astronomical measurement. It is very important to figure two main questions out. At first: In which astrometric depend on optical aberrations? And at second: How optical aberrations affect the transfer characteristics of the whole optical system. If we define the PSF (Point Spread Function) [2] of an optical system, we can use some suitable methods for restoring the original image. Optical aberration models for LSI/LSV (Linear Space Invariant/Variant) [2] systems are presented in this paper. These models are based on Seidel and Zernike approximating polynomials [1] . Optical aberration models serve as suitable tool for estimating and fitting the wavefront aberration of a real optical system. Real data from the BOOTES (Burst Observer and Optical Transient Exploring System) experiment is used for our simulations. Problems related to UWFC imaging systems, especially a restoration method in the presence of space variant PSF are described in this paper. A model of the space variant imaging system and partially of the space variant optical system has been implemented in MATLAB. The “brute force” method has been used for restoration of the testing images. The results of different deconvolution algorithms are demonstrated in this paper. This approach could help to improve the precision of astronomic measurements. 
    Type of Medium: Online Resource
    ISSN: 1805-2363 , 1210-2709
    URL: Article
    DOI: 10.14311/1023
    Language: Unknown
    Publisher: Czech Technical University in Prague - Central Library
    Publication Date: 2008
    detail.hit.zdb_id: 2575330-7
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  • 5
    Online Resource
    Online Resource
    Multi-functional star tracker — future perspectives
    Czech Technical University in Prague - Central Library ; 2011
    In:  Acta Polytechnica Vol. 51, No. 6 ( 2011-01-06)
    Details
    In: Acta Polytechnica, Czech Technical University in Prague - Central Library, Vol. 51, No. 6 ( 2011-01-06)
    Abstract: This paper focuses on the idea of a multi-functional wide-field star tracker (WFST) and provides a description of the current state-of-the-art in this field. The idea comes from a proposal handed in to ESA at the beginning of 2011. Star trackers (STs) usually have more than one object-lens with a small Field-of-View. They provide very precise information about the attitude in space according to consecutive evaluation of star positions. Our idea of WFST will combine the functions of several instruments, e.g. ST, a horizon sensor, and an all-sky photometry camera. WFST will use a fish-eye lens. There is no comparable product on the present-day market. Nowadays, spacecraft have to carry several instruments for these applications. This increases the weight of the instrumentation and reduces the weight available for the payload.
    Type of Medium: Online Resource
    ISSN: 1805-2363 , 1210-2709
    URL: Article
    DOI: 10.14311/1486
    Language: Unknown
    Publisher: Czech Technical University in Prague - Central Library
    Publication Date: 2011
    detail.hit.zdb_id: 2575330-7
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