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Volumetric efficiency
RATIO OF THE MASS DENSITY OF A MIXTURE DRAWN INTO A CYLINDER AT ATMOSPHERIC PRESSURE TO THE MASS DENSITY OF THE SAME VOLUME OF AIR IN THE INTAKE MANIFOLD
Volumetric efficiency (VE) in internal combustion engine engineering is defined as the ratio of the mass density of the air-fuel mixture drawn into the cylinder at atmospheric pressure (during the intake stroke) to the mass density of the same volume of air in the intake manifold. The term is also used in other engineering contexts, such as hydraulic pumps and electronic components.
Volumetric display
3D GRAPHIC DISPLAY DEVICE
Swept-volume display; Volumetric Display; Holovision; Volumetric projections; Volumetric projector; Volumetric Projections; Free-space display; Volumetric Image; Volumetric displays; Static-volume volumetric display; Volumetric 3D display; Volumetric display device
A volumetric display device is a display device that forms a visual representation of an object in three physical dimensions, as opposed to the planar image of traditional screens that simulate depth through a number of different visual effects. One definition offered by pioneers in the field is that volumetric displays create 3D imagery via the emission, scattering, or relaying of illumination from well-defined regions in (x,y,z) space.
Spectral efficiency
INFORMATION RATE THAT CAN BE TRANSMITTED OVER A GIVEN BANDWIDTH
Spectrum efficiency; System spectrum efficiency; System spectral efficiency; Link spectral efficiency; Bandwidth efficiency; BandWidth efficiency; Area spectral efficiency; Spectral efficiency comparison table; Bit/s/Hz; Bits/s/Hz; (bit/s)/Hz; (bit/s)/Hertz; Modulation efficiency; Channel spectral efficiency
Spectral efficiency, spectrum efficiency or bandwidth efficiency refers to the information rate that can be transmitted over a given bandwidth in a specific communication system. It is a measure of how efficiently a limited frequency spectrum is utilized by the physical layer protocol, and sometimes by the medium access control (the channel access protocol).
