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Active laser medium (also called gain medium or lasing medium), a quantum system that allows amplification of power (gain) of waves passing through (usually by stimulated emission) Optical medium, in physics, a material through with electromagnetic waves propagate; Excitable medium, a non-linear dynamic system which has the capacity to ...
Signals are typically imposed on a wave of some kind suitable for the chosen medium. For example, data can modulate sound, and a transmission medium for sounds may be air, but solids and liquids may also act as the transmission medium. Vacuum or air constitutes a good transmission medium for electromagnetic waves such as light and radio waves.
Neil Postman states, "if in biology a 'medium' is something in which a bacterial culture grows (as in a Petri dish), in media ecology, the medium is 'a technology within which a [human] culture grows.'" [5] [6] [7] In other words, "Media ecology looks into the matter of how media of communication affect human perception, understanding, feeling ...
In optics, an optical medium is material through which light and other electromagnetic waves propagate. It is a form of transmission medium . The permittivity and permeability of the medium define how electromagnetic waves propagate in it.
A bounded medium if it is finite in extent, otherwise an unbounded medium; A linear medium if the amplitudes of different waves at any particular point in the medium can be added; A uniform medium or homogeneous medium if its physical properties are unchanged at different locations in space
Physical medium may refer to: Transmission medium , a system or substance that can mediate the propagation of signals for the purposes of telecommunication Physical mediumship , the manipulation of energies and energy systems by spirits
The history of measurements is a long one. The Ancient Greeks, for example, used distance measurements based on human anatomy—including the foot, but also the forearm and palm—while the Romans ...
In materials science, a porous medium or a porous material is a material containing pores (voids). [1] The skeletal portion of the material is often called the "matrix" or "frame". The pores are typically filled with a fluid ( liquid or gas ).