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  • 1995-1999  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Sequential sampling for adult coccinellids in wheat (1997)
    Springer
    Entomologia experimentalis et applicata 84 (1997), S. 267-273 
    Details
    ISSN: 1570-7458
    Keywords: Insecta ; Coleoptera ; Coccinellidae ; population density ; timed counts ; quadrat sampling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Adult aphidophagous coccinellids are important predators of cereal aphids in wheat in the Great Plains of the United States for which sampling methods are needed to facilitate improved management. An equation relating the mean number of adult coccinellids per m2 in a wheat field to its variance was obtained using Taylor's power law. A sequential sampling procedure was developed to estimate the number of adult coccinellids per m2 with constant average statistical precision (standard error/mean). The procedure was constructed by an equation relating the number of adult coccinellids per m2 to the number of adult coccinellids per minute of counting incorporating into the Taylor's power law relationship. The procedure involves conducting a series of 1-min counts while walking through a field at a constant velocity of 10 m per minute. After each 1-min count sequential sampling stop-lines are consulted to determine if the specified level of precision has been achieved. Two methods, a statistical procedure and comparison with independent data, were used to assess the consistency with which the specified level of precision was achieved by the procedure. Results indicated that observed precision was close to that specified by the user over a wide range of adult coccinellid density.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003088216558
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Measurement of the polarization of $$\Lambda ^0 , \overline \Lambda ^0 , \Sigma ^ + $$ and Ξ− produced in a Σ− beam of 330 GeV/c (1995)
    Springer
    The European physical journal 350 (1995), S. 379-386 
    Details
    ISSN: 1434-601X
    Keywords: 13.90.+ i ; 14.20.Jn
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The polarization of $$\Lambda ^0 , \overline \Lambda ^0 , \Sigma ^ + $$ andΘ − inclusively produced inσ } induced interactions at 330 GeV has been measured in the experiment WA89 at CERN. This is the first measurement of polarization of baryons produced by an unpolarized hyperon beam. No polarization of $$ \overline \Lambda ^0 $$ is observed, as was also the case in proton beam data. At transverse momenta of about 1 GeV/c Λℴ and Σ+ show little polarization, significantly lower than in the proton beam data, whileΘ − have a polarization comparable to the polarization of Λ0 produced in proton beams.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01291194
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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