Black holes, quasars and active galaxies. Black holes are objects so dense, and with so much mass, that even light cannot escape their gravity. The existence of black holes has been theorised for more than 200 years. It is impossible to observe them directly, and astronomers had no way to test their theories until Hubble arrived.
Sequence IIIG Test Method. Sequence IIIG testing for automotive engine oils. The Sequence IIIG Test is a fired-engine, dynamometer lubricant test for evaluating automotive engine oils for certain high-temperature performance characteristics, including oil thickening, varnish deposition, oil consumption, and engine wear.
Video presented by Ana Bracilovic, MD. This video accompanies the article: Electromyography (EMG) . Video Transcript. EMG/NCS stands for electromyogram and nerve conduction studies and this is an electrical test of your nerves and muscles. The purpose of the test is to localize where your symptoms are coming from.his video accompanies the article: Electromyography (EMG) . Video Transcript. EMG/NCS stands for electromyogram and nerve conduction studies and this is an electrical test of your nerves and muscles. The purpose of the test is to localize where your symptoms are coming from.