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  • 1
    Electronic Resource
    Electronic Resource
    Experimental Set-Up for Detecting Very Fast and Dispersed Millisecond Pulsars (2000)
    Springer
    Experimental astronomy 10 (2000), S. 473-485 
    Details
    ISSN: 1572-9508
    Keywords: data processing technique ; instrumentation ; millisecond pulsars ; radio astronomy ; survey
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have developed observational and data processingtechniques for detecting millisecond pulsars. Themethod of data processing consists in correlating timeseries of data by folding them in two steps accordingto a trial period. While very time consuming,especially for very short periods, this methods allowsus in principle to detect very fast and dispersedmillisecond pulsars. The experimental set-up has beenintegrated into a data acquisition system developed atCentre national d'études spatiales (CNES).Observations of known millisecond pulsars atNançay radio observatory are used to validate thesystem and assess the sensitivity of the survey, whichis 3.5 mJy for 240 sec of integration. Futureimprovements in the radio-telescope and the systemshould bring it down to below 1 mJy. The applicationof the method to a millisecond pulsar survey is underway at Nançay radio observatory in collaborationbetween the Bureau international des poids et mesure(BIPM), Observatoire Midi-Pyrénées (OMP), and CNES.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008161231710
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Periodic solutions about the collinear lagrangian solution in the general problem of three bodies (1981)
    Springer
    Celestial mechanics and dynamical astronomy 24 (1981), S. 63-82 
    Details
    ISSN: 1572-9478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The article describes the solutions near Lagrange's circular collinear configuration in the planar problem of three bodies with three finite masses. The article begins with a detailed review of the properties of Lagrange's collinear solution. Lagrange's quintic equation is derived and several expressions are given for the angular velocity of the rotating frame. The equations of motion are then linearized near the circular collinear solution, and the characteristic equation is also derived in detail. The different types of roots and their corresponding solutions are discussed. The special case of two equal outer masses receives special attention, as well as the special case of two small outer masses. Finally, the fundamental family of periodic solutions is extended by numerical integration all the wap up to and past a binary collision orbit. The stability and the bifurcations of this family are briefly enumerated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01228794
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A study of the publishing activity of astronomers since 1969 (1991)
    Springer
    Scientometrics 22 (1991), S. 9-39 
    Details
    ISSN: 1588-2861
    Source: Springer Online Journal Archives 1860-2000
    Topics: Information Science and Librarianship , Nature of Science, Research, Systems of Higher Education, Museum Science
    Notes: Abstract This is a statistical analysis of the publishing activity of astronomers worldwide, as measured by the number of papers and monographs published in the period 1969–87. Both the astronomical literature and the number of authors publishing in the field are increasing rapidly. The distribution of productivity among astronomers is followed in time, thus revealing the evolution of research methods and publication strategies in the past 19 years. Fourteen “superproductive” astronomers, who published over 150 papers in 15 years, and the subsample of French astronomers active in 1986 are investigated separately.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02019273
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    Paper (German National Licenses)
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