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  • 52.25.Jm  (1)
  • Testing problems with nuisance parameters  (1)
  • high-energy laser  (1)
  • 1
    ISSN: 1090-6487
    Keywords: 52.50.Jm ; 52.25.Jm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new approach for investigation of the generation of fast ions and hot electrons inside the same plasma volume in laser-produced plasmas is proposed. It is based on the spectroscopic observation of line radiation from singly and doubly excited levels with simultaneous high spectral and spatial resolution. The experimental results demonstrate the observation of fast ions from highly charged target material inside the plasma volume and suggest that the generally accepted scaling relations are seriously invalid under certain conditions. Even at rather modest intensities ions with energies of several MeV are observed.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    International journal of thermophysics 20 (1999), S. 1325-1330 
    ISSN: 1572-9567
    Keywords: heavy ions ; high energy density ; high-energy laser ; intertial confinement fusion energy ; plasma physics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The energy loss of heavy ions in matter is completely different from the case of laser beams. Whereas laser radiation produces a plasma on the surface of the target and heats the volume mostly by shock waves, heavy ions penetrate deep into the target with an almost-constant energy loss in the beginning and a very high energy loss at the end of the range, the so called “Bragg peak.” This special behavior offers excellent possibilities for the examination of critical points of different materials, the measurement of benchmarks for equations of state, production and detection of X-rays and XUV radiation, investigations in physics of overdense plasma, and many more topics. In particular, heavy ion beams are considered to be a very efficient driver for an inertial confinement fusion power plant. Thus, research on the elementary processes of the energy deposition of heavy ions in matter with respect to inertial fusion energy is of primary interest.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Mathematical methods of operations research 33 (1989), S. 1-20 
    ISSN: 1432-5217
    Keywords: Testing problems with nuisance parameters ; LAN-families ; local asymptotic optimal tests ; analysis of covariance ; heteroscedasticity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Description / Table of Contents: Zusammenfassung Den meisten Testproblemen liegt ein mehrdimensionaler Parameter zugrunde, von dem nur eine eindimensionale Komponente die Hypothesen charakterisiert. Zur Elimination der restlichen Komponenten — des sog. Nebenparameters — gibt es im strengen Sinne nur zwei Methoden, die überdies starke Voraussetzungen an die Struktur des Modells erfordern: 1) Bedingen durch eine suffiziente und vollständige Statistik; 2) Reduktion durch Invarianz. Es wird gezeigt, daß die lokal asymptotische Betrachtungsweise in Verallgemeinerung der Neymanschen Theorie derC(α)-Tests in einheitlicher Weise zu Näherungslösungen führt, sofern nur gewisse Differenzierbarkeitseigenschaften erfüllt sind. Der asymptotische Zugang dient hier primär der Gewinnung plausibler Prüfgrößen für endlichen Stichprobenumfang; erst in zweiter Linie liegt die Betonung auf der asymptotischen Optimalität. Als Beispiele werden lineare Modelle unter Heteroskedastizität und ohne Normalverteilungsannahme betrachtet.
    Notes: Summary Most testing problems involve a multidimensional parameter, only one component of which characterizes the hypotheses. In a mathematically strong sense, there are only two methods to cope with the remaining component, the so called nuisance parameter. Firstly, conditioning on a sufficient and complete statistic and, secondly, reduction by invariance. Both methods require strong assumptions on the underlying class of distributions. Therefore the local asymptotic approach is reviewed, which extends Neyman's theory ofC(α)-tests and yields, in a unified way, approximate optimal test statistics for smoothly indexed families. That device is applied to non-normal heteroscedastic linear models.
    Type of Medium: Electronic Resource
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