excess noise temperature
121Physical Sciences — ▪ 2009 Introduction Scientists discovered a new family of superconducting materials and obtained unique images of individual hydrogen atoms and of a multiple exoplanet system. Europe completed the Large Hadron Collider, and China and India took… …
122Friction — For other uses, see Friction (disambiguation). Classical mechanics …
123International Space Station — ISS redirects here. For other uses, see ISS (disambiguation). International Space Station …
124Optical amplifier — An optical amplifier is a device that amplifies an optical signal directly, without the need to first convert it to an electrical signal. An optical amplifier may be thought of as a laser without an optical cavity, or one in which feedback from… …
125Digital photography — Nikon D700 a 12.1 megapixel full frame DSLR …
126List of Chinese inventions — A bronze Chinese crossbow mechanism with a buttplate (the wooden components have …
127Check weigher — Example checkweigher. Product passes on the conveyor belt where it is weighed A checkweigher is an automatic machine for checking the weight of packaged commodities. It is normally found at the offgoing end of a production process and is used to… …
128Architecture and Civil Engineering — ▪ 2009 Introduction Architecture For Notable Civil Engineering Projects in work or completed in 2008, see Table (Notable Civil Engineering Projects (in work or completed, 2008)). Beijing was the centre of the world of architecture… …
