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51Proton exchange membrane fuel cell — Diagram of a PEM fuel cell Proton exchange membrane fuel cells, also known as polymer electrolyte membrane (PEM) fuel cells (PEMFC), are a type of fuel cell being developed for transport applications as well as for stationary fuel cell… …
52Computer — For other uses, see Computer (disambiguation). Computer technology redirects here. For the company, see Computer Technology Limited. Computer …
53New England Quarter — Diagram showing the layout of streets and significant buildings in the New England Quarter area before and after its redevelopment …
54Synthesizer — For other uses, see Synthesizer (disambiguation). Synth redirects here. For other uses, see Synth (disambiguation). See also: Software synthesizer Early Minimoog by R.A. Moog Inc. (ca. 1970) A synthesizer (often abbreviated synth ) is an… …
55Similitude (model) — For other uses, see Similitude (disambiguation). A full scale X 43 Wind tunnel test. The test is designed to have dynamic similitude with the real application to ensure valid results. Similitude is a concept applicable to the testing of… …
56Makarov pistol — For other uses, see Makarov (disambiguation). Makarov pistol Makarov pistol Type Se …
57Portico — For other uses, see Portico (disambiguation). Under the portico of the Pantheon …
58Needle gun — For other uses, see Needle gun (disambiguation). Dreyse needle gun, model 1865. A needle gun is a firearm that has a needle like firing pin, which can pass through the paper cartridge case to impact a percussion cap at the bullet base. A needle… …
59Corrosion fatigue — is fatigue in a corrosive environment. It is the mechanical degradation of a material under the joint action of corrosion and cyclic loading. Nearly all engineering structures experience some form of alternating stress, and are exposed to harmful …
60Mars Observer — Artist rendering of Mars Observer in orbit around Mars. Operator NASA / JPL …
