نتایج جستجو برای: 000 years of earth
تعداد نتایج: 21198985 فیلتر نتایج به سال:
The Starshot lightsail project aims to build an ultralight spacecraft (“nanocraft”) that can reach Proxima Centauri b in approximately 20 years, requiring propulsion with a relativistic velocity of ∼60 000 km/s. spacecraft’s acceleration approach currently under investigation is based on applying the radiation pressure from high-power laser array located Earth lightsail. However, practical real...
INTRODUCTION Type 2 diabetes poses an increasing public health burden in South Africa (SA) with obesity as the main driver of the epidemic. Consumption of sugar sweetened beverages (SSBs) is linked to weight gain and reducing SSB consumption may significantly impact the prevalence of obesity and related diseases. We estimated the effect of a 20% SSB tax on the burden of diabetes in SA. METHOD...
A paucity of empirical non-marine data means that uncertainty surrounds the impact of climate change on terrestrial ecosystems in tropical regions beyond the last glacial period. The sedimentary fill of the Bosumtwi impact crater (Ghana) provides the longest continuous Quaternary terrestrial archive of environmental change in West Africa, spanning the last 1.08 million years. Here we explore th...
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