HALL EFFECT THRUSTERS: HISTORICAL PERSPECTIVE AND FUTURE EVOLUTIONARY TRENDS May 23, 2013 HALL EFFECT THRUSTERS: HISTORICAL PERSPECTIVE AND FUTURE EVOLUTIONARY TRENDS Dr. Ned Britt, The Cameron Group, Inc. Hall effect thrusters (HET) are becoming a pervasive method of electric propulsion for satellite stationkeeping. Because communication satellites are trending toward higher-power solar arrays, and because HETs have relatively high ...
Suzi Eszterhas is an author and award-winning wildlife photographer. She photographs beautiful, mysterious and-sometimes-dangerous animals. In her career, Eszterhas has photographed wildlife in tropical rain forests, the Arctic Ocean and African savannas. She has followed bears, penguins, sea otters, lions, gorillas, cheetahs and many more. Eszterhas's photos can be found ...
Where: SonomaCost: Free
The Amoeba in the Room: Why Animals and Plants Don't Matter Very MuchHere are some facts of life: A drop of seawater contains 100 thousand bacteria and millions of predatory viruses; a pinch of soil swarms with cryptic microbes whose activities are a mystery; the atmosphere is misted with 50 million tons of fungal spores that affect the weather; and, our bodies ...
