He showed a graph of rising and falling wind power generation in the wind - rich Tehachapi region and another graph of solar energy variation over a twenty - four - hour period. (greentechmedia.com)
She pictures a vast landscape, far grander than the visible universe, in which the natural fluctuations of quantum physics drive endless random energy variations. (discovermagazine.com)
The rapid energy variations, the team reports in the 20 April issue of The Astrophysical Journal, are caused by hot spots on the stars» surfaces rotating in and out of view. (sciencemag.org)