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  • 1
    Electronic Resource
    Electronic Resource
    Sampling from binomial and poisson distributions: A method with bounded computation times (1980)
    Springer
    Computing 25 (1980), S. 193-208 
    Details
    ISSN: 1436-5057
    Keywords: Random Numbers ; Binomial Distribution ; Poisson Distribution ; Simulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Ein exakter Verwerfungsalgorithmus wird konstruiert und ausgetestet. Das Verfahren erfordert durchschnittlich weniger als 3 gleichverteilte Zufallszahlen, solange die Standardabweichung σ der Verteilung mindestens 4 beträgt; diese Anzahl fällt monoton gegen 2,63 für σ→∞. Variable Parameter sind zugelassen; es werden keinerlei Unterprogramme für Stichproben von anderen statistischen Verteilungen benötigt.
    Notes: Abstract An accurate acceptance-rejection algorithm is devised and tested. The procedure requires an average of less than 3 uniform deviates whenever the standard deviation σ of the distribution is at least 4, and this number decreases monotonically to 2.63 as σ→∞. Variable parameters are permitted, and no subroutines for sampling from other statistical distributions are needed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02241999
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Intense source of slow positrons from pulsed electron accelerators (1984)
    Springer
    Applied physics 33 (1984), S. 59-62 
    Details
    ISSN: 1432-0630
    Keywords: 7.77 ; 29.25
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A pulsed LINAC is used for pair production in a tantalum target of 2.5 radiation lengths in an energy range from 80 to 260 MeV. Several well-annealed tungsten vanes are placed immediately behind the target and thermalize a small fraction of the fast positrons. The slow positrons are extracted from the target region and magnetically guided over a distance of 17 m to the detector at the end of an S-shaped solenoid. Two Nal detectors with well-known detection efficiency are used to register the 511 keV annihilationγ-rays. To reduce pile-up effects 50 mm of Pb were placed in front of the detectors. At an average electron current of 1 μA we could detect about 107 slow positrons per second. The positron yield is proportional to the electron current, and shows an increase with the electron energy for our target. The positron energy distribution has a FWHM of ∼ 1.8 eV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01197087
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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