Dispersion
Encyclopedia
Dispersion may refer to:
In physics:
In other sciences:
Other uses:
In physics:
- The dependence of wave velocity on frequency or wavelength:
- Dispersion (optics)Dispersion (optics)In optics, dispersion is the phenomenon in which the phase velocity of a wave depends on its frequency, or alternatively when the group velocity depends on the frequency.Media having such a property are termed dispersive media...
, for light waves - Dispersion (water waves)Dispersion (water waves)In fluid dynamics, dispersion of water waves generally refers to frequency dispersion, which means that waves of different wavelengths travel at different phase speeds. Water waves, in this context, are waves propagating on the water surface, and forced by gravity and surface tension...
- Acoustic dispersionAcoustic dispersionAcoustic dispersion is the phenomenon of a sound wave separating into its component frequencies as it passes through a material. The phase velocity of the sound wave is viewed as a function of frequency...
, for sound waves - Dispersion relationDispersion relationIn physics and electrical engineering, dispersion most often refers to frequency-dependent effects in wave propagation. Note, however, that there are several other uses of the word "dispersion" in the physical sciences....
, the mathematical description of dispersion in a system - Modal dispersionModal dispersionModal dispersion is a distortion mechanism occurring in multimode fibers and other waveguides, in which the signal is spread in time because the propagation velocity of the optical signal is not the same for all modes...
, spreading of signals in multimode fibers and waveguides by a distortion mechanism- Polarization mode dispersionPolarization mode dispersionPolarization mode dispersion is a form of modal dispersion where two different polarizations of light in a waveguide, which normally travel at the same speed, travel at different speeds due to random imperfections and asymmetries, causing random spreading of optical pulses...
, a form of modal dispersion
- Polarization mode dispersion
- Dielectric dispersion, the dependence of the permittivity of a dielectric material on the frequency of an applied electric field
- Dispersion (optics)
- Dispersive mass transferDispersive mass transferDispersive mass transfer, in fluid dynamics, is the spreading of mass from highly concentrated areas to less concentrated areas. It is one form of mass transfer....
, in fluid dynamics, the spreading of mass from areas of high to low concentration- Atmospheric dispersion modelingAtmospheric dispersion modelingAtmospheric dispersion modeling is the mathematical simulation of how air pollutants disperse in the ambient atmosphere. It is performed with computer programs that solve the mathematical equations and algorithms which simulate the pollutant dispersion...
, mathematical simulation of how air pollutants disperse in the ambient atmosphere
- Atmospheric dispersion modeling
- London dispersion forceLondon dispersion forceLondon dispersion forces is a type of force acting between atoms and molecules. They are part of the van der Waals forces...
, an instantaneous induced dipole-induced dipole
In other sciences:
- Dispersion (chemistry)Dispersion (chemistry)A dispersion is a system in which particles are dispersed in a continuous phase of a different composition . See also emulsion. A dispersion is classified in a number of different ways, including how large the particles are in relation to the particles of the continuous phase, whether or not...
, a system in which particles are dispersed in a continuous phase of a different composition - Dispersion (geology)Dispersion (geology)Dispersion occurs when a soil is sodic. When a sodic soil is wetted the clay particles are forced apart. This is generally a major cause of erosion.-Prevention of dispersion:Preventing dispersion can be done by:* re-vegetating the area...
, a process whereby sodic soil disperses when exposed to water - Dispersion (materials science)Dispersion (materials science)In materials science, dispersion is the fraction of atoms of a material exposed to the surface. In general:where D is the dispersion, NS is the number of surface atoms and NT is the total number of atoms of the material...
, the fraction of atoms of a material exposed to the surface - Biological dispersalBiological dispersalBiological dispersal refers to species movement away from an existing population or away from the parent organism. Through simply moving from one habitat patch to another, the dispersal of an individual has consequences not only for individual fitness, but also for population dynamics, population...
, the distribution of animals, spores, fruits and their seeds, etc.
Other uses:
- Dispersion (finance)Dispersion (finance)Dispersion is a measure for the statistical distribution of portfolio returns. It is the asset-weighted standard deviation of individual portfolio returns within a comparable client group from the composite return.-Types of Dispersion:...
, a measure for the statistical distribution of portfolio returns - Statistical dispersionStatistical dispersionIn statistics, statistical dispersion is variability or spread in a variable or a probability distribution...
, a quantifiable variation of measurements of differing members of a population- Index of dispersion, a normalized measure of the dispersion of a probability distribution
- Price dispersionPrice dispersionIn economics, price dispersion is variation in prices across sellers of the same item, holding fixed the item's characteristics. Price dispersion can be viewed as a measure of trading frictions . It is often attributed to consumer search costs or unmeasured attributes of the retailing outlets...
, a variation in prices across sellers of the same item - Wage dispersionWage dispersionWage dispersion is an economic term which refers to the amount of variation in wages encountered in an economy.-Wage dispersion in the US and Europe:European countries have in general much less wage dispersion than the U.S. does...
, the amount of variation in wages encountered in an economy