the gas pressure reduction ratio
41Muzzle brake — The muzzle brake of the 105 mm gun on an AMX 10 RC fighting vehicle …
42Oxygen–haemoglobin dissociation curve — The oxygen–haemoglobin dissociation curve (or oxygen–hemoglobin dissociation curve) plots the proportion of haemoglobin in its saturated form on the vertical axis against the prevailing oxygen tension on the horizontal axis. The oxyhaemoglobin… …
43Six stroke engine — The term six stroke engine describes two different approaches in the internal combustion engine, developed since the 1990s, to improve its efficiency and reduce emissions:In the first approach, the engine captures the waste heat from the four… …
44Hydrogen economy — The hydrogen economy is a proposed system of delivering energy using hydrogen. The term hydrogen economy was coined by John Bockris during a talk he gave in 1970 at General Motors (GM) Technical Center.[1] Hydrogen advocates promote hydrogen as… …
45GM Family II engine — The Family II is a straight 4 piston engine that was originally developed by Opel in the early 1970s. It was used in the Opel Ascona and Opel Kadett and their corresponding sister models the Vauxhall Cavalier and Vauxhall Astra. In the US the… …
46Oil well — The pumpjack, such as this one located south of Midland, Texas, is a common sight in West Texas. An oil well is a general term for any boring through the earth s surface that is designed to find and acquire petroleum oil hydrocarbons. Usually… …
47TGV — The TGV ( train à grande vitesse , French for high speed train ) is France s high speed rail service developed by GEC Alsthom (now Alstom) and SNCF, the French national rail operator, and operated primarily by SNCF. Following the inaugural TGV… …
48Wankel engine — The Wankel engine is a type of internal combustion engine which uses a rotary design to convert pressure into a rotating motion instead of using reciprocating pistons. Its four stroke cycle is generally generated in a space between the inside of… …
49Nuclear weapon design — The first nuclear weapons, though large, cumbersome and inefficient, provided the basic design building blocks of all future weapons. Here the Gadget device is prepared for the first nuclear test: Trinity. Nuclear weapon designs are physical,… …
50Pulse tube refrigerator — The Pulse tube cryocooler is a developing technology that emerged largely in the early 1980 s with a series of other innovations in the broader field of Thermoacoustics. In contrast with other cryocoolers (eg Stirling cryocooler and Gifford… …
