Suchergebnisse

Nous n'ignorons certainement pas que chaque question se rapportant à la Croix-Rouge doit être l'objet d'une discussion internationale, et que les décisions obligatoires pour les sociétés de la Croix-Rouge ne sauraient être prises qu'en vertu de résolutions également internationales.

Three campaigns of observations performed at the «Observatoire du Pic du Midi » are analysed from the point of view of nitric acid and chlorofluorocarbon 11. The spectra, obtained in the 10 window, in both absorption and emission, permit to determine that most of the nitric acid absorbs above the tropopause while on the contrary, CFC13 emits and absorbs in the troposphere. The trend of CFC13 is observed between 1980 and 1982 ; an increase rate equal to the one measured between 1972 and 1980 is determined.

Le spectromètre infrarouge ESO 13, construit conjointement par l'ONERA (France) et l'IASB (Belgique), effectuera en 1983, des observations du limbe terrestre en absorption au coucher ou au lever du soleil, ainsi qu'en émission à partir du véhicule spatial «Spacelab ». L'organisation des intervalles spectraux et des programmes d'observation est présentée ainsi que les raisons des choix effectués pour le premier vol.

The strenght of rotation-vibration lines in the fundamental band of nitric oxide is determined for its application to aeronomical analysis of the stratosphere.

© 2017, Population Association of America. In the early twentieth century, the cotton-growing regions of the U.S. South were dominated by families of tenant farmers. Tenant farming created opportunities and incentives for prospective tenants to marry at young ages. These opportunities and incentives especially affected African Americans, who had few alternatives to working as tenants. Using complete-count Census of Population data from 1900–1930 and Census of Agriculture data from 1889–1929, we find that increases in tenancy over time increased the prevalence of marriage among young African Americans. We then study how marriage was affected by one of the most notorious disruptions to southern agriculture at the turn of the century: the boll weevil infestation of 1892–1922. Using historical Department of Agriculture maps, we show that the boll weevil's arrival reduced the share of farms worked by tenants as well as the share of African Americans who married at young ages. When the boll weevil infestation altered African Americans' opportunities and incentives to marry, the share of African Americans who married young fell accordingly. Our results provide new evidence about the effect of economic and political institutions on demographic transformations.