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  • 1
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    In:  CASI
    Publikationsdatum: 2004-12-03
    Beschreibung: A multi-component method for the description of the evolution of the grain size distribution in consideration of a size dependent grain drift and growth rate is applied in order to model dust driven winds around cool C-stars. Grain drift introduces several modifications concerning dust growth: on one hand the residence time in the region of efficient growth is reduced, on the other hand the growth efficiency is higher due to an increased collisional rate. For carbon grains the surface density of radical sites is increased, but on the other hand there is a reduction of the sticking efficiency of the growth species for drift velocities larger than a few km/s. It is found that the consideration of drift results in a considerable distortion of the size distribution as compared to the case of zero drift velocity. Generally, there are less, but larger grains if drift is included.
    Schlagwort(e): Astronomy
    Materialart: From Stardust to Planetesimals: Contributed Papers; 77-80; NASA-CP-3343
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Publikationsdatum: 2013-08-29
    Beschreibung: High-spectral-resolution Rayleigh-Mie lidar measurements of vertical profiles (1 to 5 km) of atmospheric pressure and density, as well as aerosol profiles, including backscatter ratio and extinction ratio are reported. These require simultaneous measurement of temperature. Use of the technique does not require any assumptions about the aerosol but does require that the pressure at one altitude is known and that the gas law of the air is known (e.g., an ideal gas).
    Schlagwort(e): ENVIRONMENT POLLUTION
    Materialart: NASA. Langley Research Center, 16th International Laser Radar Conference, Part 2; p 505-508
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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