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    Université de Fribourg

    L'ambroisie : analyse statistique et modélisation numérique de sa trajectoire aérobiologique

    Goyette-Pernot, Joëlle ; Beniston, Martin (Dir.)

    Thèse de doctorat : Université de Fribourg, 2006 ; no 1530.

    Allergic rhinitis as well as associated costs are constantly increasing, affecting a proportion always larger of the population across the world. Ragweed is a source of pollen well known for its high allergenic properties. Characterized by heavy emissions of the pollen in the air from August to October of each year, its allergenic potential is greatly enhanced. This study deals with the problems...

    Université de Fribourg

    Relationship between hailfall intensity and hail damage on ground, determined by radar and lightning observations

    Hohl, Roman Marco ; Beniston, Martin (Dir.)

    Thèse de doctorat : Université de Fribourg, 2001 ; no 1357.

    Weather radars are now available in many countries for operational observations and measurements of hailstorms and provide detailed information on the formation and structure of severe thunderstorms. Much research has been devoted to the quantitative measurement of hailfalls and the nowcasting of hail-bearing thunderstorms which is of interest for national weather services and airports (warning),...

    Université de Fribourg

    Extracting quantitative sub-pixel heterogeneity information from optical remote sensing data

    Widlowski, Jean-Luc ; Beniston, Martin (Dir.)

    Thèse de doctorat : Université de Fribourg, 2001 ; no 1358.

    This work describes two approaches for the extraction of quantitative information on the degree of surface heterogeneity at the subpixel scale of optical remote sensing data. The first approach is a look-up-table based inversion scheme, where the spectral reflectances of realistically modelled three-dimensional vegetation canopies are pre-computed for a variety of atmospheric optical depths, and...