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  • PACS. 13.60.Le Meson production – 25.20.Lj Photoproduction reactions  (2)
  • Binomial Distribution  (1)
  • Emulsionpolymerization  (1)
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Materialart
Erscheinungszeitraum
Schlagwörter
  • 1
    Digitale Medien
    Digitale Medien
    Sampling from binomial and poisson distributions: A method with bounded computation times (1980)
    Springer
    Computing 25 (1980), S. 193-208 
    Details
    ISSN: 1436-5057
    Schlagwort(e): Random Numbers ; Binomial Distribution ; Poisson Distribution ; Simulation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik
    Beschreibung / Inhaltsverzeichnis: 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.
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02241999
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Some aspects of polymer colloids I. Preparation and properties of different types of latex particles (1990)
    Springer
    Colloid & polymer science 268 (1990), S. 924-933 
    Details
    ISSN: 1435-1536
    Schlagwort(e): Emulsionpolymerization ; lightscattering ; particlesize ; polystyrenelatices ; surface-areadetermination
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Abstract The boundary region separating a latex particle from the surrounding medium has a great influence on the properties of latex dispersions. Four types of polystyrene and polystyrene/comonomer latices differing greatly in the structure of the boundary region were prepared. The first part of a series of papers reports on the preparation of the various latex dispersions. Mean particle sizes were obtained from simple turbidity measurements, quasi-elastic light scattering, and electron micrographs. The behavior of the particles in the centrifugal force field is a simple tool for detecting aggregation tendencies that are not directly related to salt stability. The BET-surface area agrees with the area calculated from the mean particle size when a sharp boundary and smooth surface is developed between the particle and the surrounding medium. In the case of particles with extended boundary regions (core/shell particles or particles with hairy envelopes), film formation reduces the specific surface area. Removal of soluble oligomers and polymers from the boundary region during subsequent treatments (purification and centrifugation before freeze-drying) can increase the surface area considerably.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01469371
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  • 3
    Digitale Medien
    Digitale Medien
    Double- π0 photoproduction from the deuteron (2000)
    Springer
    The European physical journal 9 (2000), S. 1-4 
    Details
    ISSN: 1434-601X
    Schlagwort(e): PACS. 13.60.Le Meson production – 25.20.Lj Photoproduction reactions
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: The photoproduction of two neutral pions from the deuteron has been studied for incident photon energies from 200 MeV to 820 MeV with the TAPS spectrometer at MAMI (Mainz Microtron). The total cross-section was determined and used to deduce the cross-section from the neutron. Due to the good statistical quality of the data Dalitz plots for the three particles in the exit channel (π0π0 N) could be constructed. The invariant mass distributions derived from them are presented in this paper. They indicate that the important reaction mechanism in the second resonance region is a sequential decay pattern involving the population of the Δ(1232)-resonance as an intermediate state.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s100500070047
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  • 4
    Digitale Medien
    Digitale Medien
    Photoproduction of neutral pion pairs from the proton (2000)
    Springer
    The European physical journal 9 (2000), S. 5-8 
    Details
    ISSN: 1434-601X
    Schlagwort(e): PACS. 13.60.Le Meson production – 25.20.Lj Photoproduction reactions
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: Double neutral pion photoproduction from the proton has been measured at MAMI for photon energies between threshold and 820 MeV. The reaction was identified by an invariant mass and missing mass analysis. From threshold up to 370 MeV the total cross-section does not exceed 30 nb. For higher energies it shows a smooth rise until it reaches a maximum of about 10 μb at E γ = 740 MeV. Dalitz plots of m 2(π0π0) versus m 2(p,π0) for seven bins of incident photon energy have been analysed. For E γ 〉 610 MeV, a strong contribution of a sequential decay is observed with the Δ(1232)-resonance as intermediate state. A comparison to model calculations shows that these sequential decays presumably originate from the D 13(1520) and also the P 11(1440)-resonance.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s100500070048
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