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  • 1
    Electronic Resource
    Electronic Resource
    Host recognition and the study of a chemical basis for attraction by cuckoo bumble bees (Hymenoptera: Apidae) (1993)
    Springer
    Journal of chemical ecology 19 (1993), S. 771-786 
    Details
    ISSN: 1573-1561
    Keywords: Host recognition ; volatiles ; social parasitism ; cuckoo bumble bees ; Bombus terrestris ; Bombus terricola ; Psithyrus vestalis ; Psithyrus ashtoni ; Hymenoptera ; Apidae ; Dufour's gland ; tergal gland
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Species ofPsithyrus (Hymenoptera; Apidae) are obligate bumble bee social parasites. In this study, females ofP. vestalis andP. ashtoni were presented with pentane extracts prepared from different body parts of queens of their respective host species,Bombus terrestris andB. terricola. Parasites of both species were capable of distinguishing host bees from other bumble bee species using chemical cues contained within extracts. Among extracts of several body parts presented to parasites, the abdomen produced the greatest behavioral response, with Dufour's gland and terminal tergal segments eliciting the greatest response among abdominal regions. Extracts of these two body parts obtained fromB. terrestris queens shared a number of compounds, identified by GC-MS. Among the identified compounds are a number that have been reported to be of importance in bee sociochemistry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00985008
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A multigrid method for recirculating flows (1988)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 8 (1988), S. 417-440 
    Details
    ISSN: 0271-2091
    Keywords: Multigrid method ; Pressure correction ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The use of multigrid methods in complex fluid flow problems is recent and still under development. In this paper we present a multigrid method for the incompressible Navier-Stokes equations. The distinctive features of the method are the use of a pressure-correction method as a smoother and a novel continuity-preserving manner of grid coarsening. The shear-driven cavity problem is used as a test case to demonstrate the efficiency of the method.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fld.1650080405
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    On the smoothing properties of the SIMPLE pressure-correction algorithm (1988)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 8 (1988), S. 441-461 
    Details
    ISSN: 0271-2091
    Keywords: Multigrid ; Local mode analysis ; Pressure correction ; Ellipticity ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A local mode Fourier analysis is used to assess the suitability of the SIMPLE pressure-correction algorithm to act as a smoother in a multigrid method. The necessary ellipticity of the Navier-Stokes equations and their discrete representation are established. The theoretical analysis is compared with practical results.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fld.1650080406
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    Paper (German National Licenses)
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