Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Rebound of pollen and spores during deposition on cylinders by inertial impaction
Abstract The relative retention or ‘sticking probability’ of ragweed pollen and Lycopodium spores impacting on glass cylinders and wheat stems was observed as the ratio of the number of panicles caught on nonsticky and sticky surfaces in a wind tunnel and the field. Their relative retention depended strongly on the kinetic energy of the particle just before impact. Below a critical threshold energy essentially all impacting particles were retained. Above this critical energy, retention decreased rapidly with increasing energy. Despite structural differences between ragweed and Lycopodium the onset of rebound for both occurred at essentially the same kinetic energy. Thus the speed for the onset of rebound of ragweed pollen was about 1.7 (equal to the square root of the ratio of the masses of Lycopodium and ragweed particles) times greater than the critical rebound speed for Lycopodium. Changes in wheat stem surface characteristics as the plant aged produced a measurable effect on the fraction of panicles rebounding from these surfaces.
Rebound of pollen and spores during deposition on cylinders by inertial impaction
Abstract The relative retention or ‘sticking probability’ of ragweed pollen and Lycopodium spores impacting on glass cylinders and wheat stems was observed as the ratio of the number of panicles caught on nonsticky and sticky surfaces in a wind tunnel and the field. Their relative retention depended strongly on the kinetic energy of the particle just before impact. Below a critical threshold energy essentially all impacting particles were retained. Above this critical energy, retention decreased rapidly with increasing energy. Despite structural differences between ragweed and Lycopodium the onset of rebound for both occurred at essentially the same kinetic energy. Thus the speed for the onset of rebound of ragweed pollen was about 1.7 (equal to the square root of the ratio of the masses of Lycopodium and ragweed particles) times greater than the critical rebound speed for Lycopodium. Changes in wheat stem surface characteristics as the plant aged produced a measurable effect on the fraction of panicles rebounding from these surfaces.
Rebound of pollen and spores during deposition on cylinders by inertial impaction
Aylor, Donald E. (Autor:in) / Ferrandino, Francis J. (Autor:in)
Atmospheric Environment ; 19 ; 803-806
15.10.1984
4 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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