wavelength calibration
111Crab Pulsar — The Crab Nebula, which contains the Crab Pulsar. Image combines optical data from Hubble (in red) and X ray images from Chandra (in blue). NASA/CXC/ASU/J. Hester et al.[1] …
112Quartz crystal microbalance — A quartz crystal microbalance (QCM) measures a mass per unit area by measuring the change in frequency of a quartz crystal resonator. The resonance is disturbed by the addition or removal of a small mass due to oxide growth/decay or film… …
113Automatic Picture Transmission — The Automatic Picture Transmission (APT) system is an analog image transmission system developed for use on weather satellites. It was introduced in the 1960s and over four decades has provided image data to relatively low cost user stations at… …
114Brix — For other uses, see Brix (disambiguation). Degrees Brix (symbol °Bx) is the sugar content of an aqueous solution. One degree Brix is 1 gram of sucrose in 100 grams of solution and represents the strength of the solution as percentage by weight (% …
115Ryle Telescope — The Ryle Telescope (named after Martin Ryle, and formerly the 5 km Array ) was a linear east west radio telescope array at the Mullard Radio Astronomy Observatory. In 2004 three of the telescopes were moved to create a compact two dimensional… …
116Array of Low Energy X-ray Imaging Sensors — The Array of Low Energy X ray Imaging Sensors (ALEXIS) X ray telescopes feature curved mirrors whose multilayer coatings reflect and focus low energy X rays or extreme ultraviolet light the way optical telescopes focus visible light. The… …
117History of Indian science and technology — [ thumb|200px|right|Hand propelled wheel cart, Indus Valley Civilization (3000–1500 BCE). Housed at the National Museum, New Delhi.] [ thumb|right|200px|The Pundit (explorer) and Indian cartographer Nain Singh Rawat (19th century CE) received a… …
118Radiolocation — is the process of finding the location of something through the use of radio waves. It generally refers to passive uses, particularly radar mdash; as well as detecting buried cables, water mains, and other public utilities. It is similar to… …
119Lapping — is a machining operation, in which two surfaces are rubbed together with an abrasive between them, by hand movement or by way of a machine.This can take two forms. The first type of lapping (traditionally called grinding), typically involves… …
120Cosmic dust — Space dust redirects here. For other uses, see Space dust (disambiguation). Porous chondrite interplanetary dust particle. Cosmic dust is a type of dust composed of particles in space which are a few molecules to 0.1 µm in size. Cosmic dust… …
