DIRECT MEASUREMENT OF 19F- SELF DIFFUSION IN BARIUM FLUORIDE CRYSTALS BY NMR

La mesure directe de l'auto-diffusion de 19F- dans les cristaux de BaF2 a été effectuée au moyen de la technique de gradient de champ en impulsions (PFG). Le coefficient d'autodiffusion a été mesuré sur trois ordres de grandeur entre 1 000 K to 1 300 K. Ces mesures démontrent la viabilité de cette technique pour obtenir les données d'auto-diffusion quand il n'y a pas de traceur convenable.The direct measurement of 19F- self-diffusion in BaF2 crystals has been carried out using the pulsed field gradient (PFG) technique. The self-diffusion coefficient has been measured over three orders of magnitude in the temperature range 1 000 K-1 300 K. These measurements demonstrate the viability of this technique as an alternative means of obtaining self-diffusion data when there is no suitable radiotracer available

Behavioral norms and expectations on Antarctic stations

© 2007 SAGE PublicationsThis study examined the organizational culture of Australian Antarctic stations in terms of behavioral norms and expectations. The study also investigated the relationship between perceptions of Antarctic station culture and individual attitudes and job outcomes. Participants were 116 returned Australian Antarctic expeditioners. Results showed that the overall profile of Antarctic station culture reflected a satisfaction-oriented culture, with the majority of participants describing Antarctic stations as open, friendly, and participatory environments. However, results also revealed gender differences in perceptions of Antarctic station norms and expectations. Although men generally described Antarctic station culture as open and team oriented, women described it as rule-oriented, hierarchical, and nonparticipatory. Perceptions of Antarctic station culture were related to individual attitudes, including satisfaction with being a member of the expedition and intention to return to the Antarctic.Aspa Sarris, Neil Kirb