X glossary entries

The x-axis is a chosen reference direction in a coordinate system, usually used as the first coordinate for position, geometry, data, or state variables.

X-band radar is a radar system that operates in the microwave X band, roughly 8 to 12 GHz, to detect, range, track, or image targets.

X-ray computed tomography is a non-destructive imaging method that reconstructs a three-dimensional volume from X-ray projections taken around a specimen.

X-ray diffraction is a characterization method that identifies crystalline phases and lattice spacing from the angles and intensities of diffracted X-rays.

X-ray fluorescence is a non-destructive elemental analysis method that measures characteristic X-rays emitted by a material after X-ray excitation.

X-ray lithography is a microfabrication process that patterns a resist layer by exposing it through a mask with short-wavelength X-rays.

A xenon arc lamp is a gas-discharge light source in which an electric arc through xenon gas produces intense broadband radiation.

A xenon ion thruster is an electric spacecraft propulsion device that ionizes xenon and accelerates the ions through electric fields to generate thrust.

XHTML is an XML-based form of HTML that represents web documents with strict, well-formed markup.

An XOR gate is a digital logic gate that outputs logic 1 when its inputs differ and logic 0 when they are the same.