Contemporary Examples. 1  He campaigned and governed in poetry, and we are all the richer for it. 2  Its essays, criticism, reportage, and poetry are not âproduct.â. 3  Laskey, who earned a degree in psychology, enjoys painting and poetry. 4  poetry would be too obvious, too âportrait of the artist as a young nuisanceâ.
Low emissivity - Definition. 1  Emissivity is the value given to materials based on the ratio of heat emitted compared to a perfect blackbody, on a scale from zero to one. A blackbody would have an emissivity of 1 and a perfect reflector would have a value of 0.
These extreme temperatures are caused by the absorption of the sun's shortwave ultraviolet radiation. This radiation penetrates the upper atmosphere, stripping atoms of their electrons and giving them a positive charge. Electrically charged atoms build up to form a series of layers within the thermosphere. These charged layers are often referred to as the ionosphere, which deflects some radio signals. Before the modern use of satellites, this deflection by the ionosphere was essential for long distance radio communication.