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  • Gaussian excitation  (2)
  • Aegilops geniculata  (1)
  • 1995-1999  (3)
  • 1
    Electronic Resource
    Electronic Resource
    An equivalent polynomial approximation technique in nonlinear structural dynamics (1995)
    Springer
    Archive of applied mechanics 65 (1995), S. 457-464 
    Details
    ISSN: 1432-0681
    Keywords: Key words nonlinear structure ; Gaussian excitation ; polynomial approximation ; stationary probability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary  A new technique is proposed to obtain an approximate probability density for the response of a general nonlinear system under Gaussian white noise excitations. In this new technique, the original nonlinear system is replaced by another equivalent nonlinear system, structured by the polynomial formula, for which the exact solution of stationary probability density function is obtainable. Since the equivalent nonlinear system structured in this paper originates directly from certain classes of real nonlinear mechanical systems, the technique is applied to some very challenging nonlinear systems in order to show its power and efficiency. The calculated results show that applying the technique presented here can yield exact stationary solutions for the nonlinear oscillators. This is obtained by using an energy-dependent system, and for a nonlinearity of a more complex type. A more accurate approximate solution is then available, and is compared with the approximation. Application of the technique is illustrated by examples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00835658
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    An equivalent polynomial approximation technique in nonlinear structural dynamics (1995)
    Springer
    Archive of applied mechanics 65 (1995), S. 457-464 
    Details
    ISSN: 1432-0681
    Keywords: nonlinear structure ; Gaussian excitation ; polynomial approximation ; stationary probability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary A new technique is proposed to obtain an approximate probability density for the response of a general nonlinear system under Gaussian white noise excitations. In this new technique, the original nonlinear system is replaced by another equivalent nonlinear system, structured by the polynomial formula, for which the exact solution of stationary probability density function is obtainable. Since the equivalent nonlinear system structured in this paper originates directly from certain classes of real nonlinear mechanical systems, the technique is applied to some very challenging nonlinear systems in order to show its power and efficiency. The calculated results show that applying the technique presented here can yield exact stationary solutions for the nonlinear oscillators. This is obtained by using an energy-dependent system, and for a nonlinearity of a more complex type. A more accurate approximate solution is then available, and is compared with the approximation. Application of the technique is illustrated by examples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00835658
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    RAPD polymorphisms in Aegilops geniculata Roth (Ae. ovata auct. non L.) (1996)
    Springer
    Genetic resources and crop evolution 43 (1996), S. 429-433 
    Details
    ISSN: 1573-5109
    Keywords: Aegilops geniculata ; RAPD ; polymorphism ; gene bank
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Genetic diversity of eighteen accessions of Ae. geniculata (2n=28; UUMM) was assessed using the random amplified polymorphic DNA (RAPD) technique. We optimized RAPD conditions including the template DNA, the concentration of AmpliTaq DNA polymerase Stoffel fragment, and MgCl2 concentration for revealing polymorphisms. Thirty-eight decamer oligonucleotides were individually used as primers under optimized conditions. Seventeen of these primers produced polymorphic RAPDs among the 18 accessions of Ae. geniculata. Polymorphisms were recorded by noting presence or absence of an amplification product from the total genomic DNA. Comparisons of unique and shared amplification products of each pair of accessions were used to generate genetic similarity coefficients (GSCs). These GSCs were used to construct a phenogram using an unweighted pair-group method with arithmetical averages (UPGMA). The phenogram shows that RAPD data is useful in the measurement of genetic variation or similarity within a species. It also indicates that we can select eight or nine accessions of the eighteen accessions to maintain at least 80% genetic variability of the Chinese collection of Ae. geniculata.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00123733
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    Paper (German National Licenses)
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