Britain and other European governments have been accused of underestimating the health risks from shipping pollution following research which shows that one giant container ship can emit almost the same amount of cancer and asthma-causing chemicals as 50m cars.
Polysomnography (PSG), a type of sleep study, is a multi-parametric test used in the study of sleep and as a diagnostic tool in sleep medicine. The test result is called a polysomnogram, also abbreviated PSG. The name is derived from Greek and Latin roots: the Greek ÏÎ¿Î»ÏÏ (polus for many, much, indicating many channels), the Latin somnus (sleep), and the Greek Î³ÏÎ¬ÏÎµÎ¹Î½ (graphein, to write).
SG Governors. Available in work ratings of 10.8 and 21.7 inch-pounds, the PSG governor is a pressure-compensated, speed-droop, or isochronous governor for controlling the speed of small diesel, gas, and gasoline engines, or small steam or industrial gas turbines.vailable in work ratings of 10.8 and 21.7 inch-pounds, the SG hydraulic speed-droop type governor is designed for use on small diesel, gas, or gasoline engines where isochronous control is not required. The droop control is such that the governor operates at a slower speed as engine load increases.