(uncountable, engineering, acoustics) A phenomenon wherein external stimuli such as mechanical loading generate physical vibrations.

plural of emission line

(physics, chemistry) A form of analytical spectroscopy that measures the radiation emitted at specific wavelengths by the atoms in a very hot sample

plural of zero-emission vehicle

plural of positron emission tomography

plural of field emission display

A vehicle that produces only carbon dioxide and water as its emissions and so does not pollute the air.

(medicine) A medical imaging technique which detects the gamma rays produced by positrons emitted from injected radionuclides.

(physics) a technique that uses field emission of electrons or positive ions from the needle-shaped tip of an emitter to produce a magnified image of the emitter surface (showing each atom) on a fluorescent screen

(physics) the instrument used in field emission microscopy