David Kligman for Pacific Gas and Electric Company PG&E's custom Ford Escape hybrids use a new gas-detection tech that allows them to identify gas-pipe leaks while driving on the highway. Related Links: Picarro Survey Device Boston University's Study In early August, a specially equipped sports-utility vehicle detected four potential gas-pipe leaks while motoring along a California highway. The improved detection capacity is due to a recently developed, highly sensitive gas-leak detection technology.The technology, developed by Picarro, Santa Clara, Calif., uses a patented form of cavity-ring down spectroscopy (CRDS) to detect gas leaks even while driving. CRDS measures the near-infrared absorption
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.