Sa-8 operational trajectory

Trajectory optimization for Saturn I /SA-8/ LAUNCH vehicle to place S- IV stage and payload in elliptical orbi

Range safety data for Saturn SA-10

Saturn SA-10 range safety data, and reliability analysis of S-IV-8 and S-IV-10 stage

The possible role of local air pollution in climate change in West Africa

The climate of West Africa is characterized by a sensitive monsoon system that is associated with marked natural precipitation variability. This region has been and is projected to be subject to substantial global and regional-scale changes including greenhouse-gas-induced warming and sea-level rise, land-use and land-cover change, and substantial biomass burning. We argue that more attention should be paid to rapidly increasing air pollution over the explosively growing cities of West Africa, as experiences from other regions suggest that this can alter regional climate through the influences of aerosols on clouds and radiation, and will also affect human health and food security. We need better observations and models to quantify the magnitude and characteristics of these impacts

How students’ perceptions of teachers’ autonomy-supportive behaviours affect physical activity behaviour: an application of the trans-contextual model

The aim of this study was to assess a modified version of the trans-contextual model (Hagger, Chatzisarantis, Culverhouse, & Biddle, 2003) based on self-determination theory (Deci & Ryan, 1985) and the theory of planned behaviour (Ajzen, 1985). The modified version included two additional components: use of learning strategies and positive general feedback. It was hypothesized that students’ perceptions of how they use learning strategies taught by their physical education (PE) teachers and perceived positive general feedback would influence students’ intrinsic motivation, intentions, and physical activity behaviour in a leisure-time context through intrinsic motivation in PE. A structural equation model supported the hypotheses and demonstrated that the use of learning strategies and perceived positive general feedback in PE indirectly influenced intrinsic motivation in leisure time through the effect of intrinsic motivation in PE. There was a direct effect of perceived positive general feedback on physical activity behaviour as well as an indirect effect through the motivational sequence