coefficient — 1. The expression of the amount or degree of any quality possessed by a substance, or of the degree of physical or chemical change normally occurring in that substance under stated conditions. 2. The ratio or factor that relates a quantity… … Medical dictionary
Path loss — Affaiblissement de propagation L’affaiblissement de propagation, aussi connu comme affaiblissement de parcours ou par son nom anglais de path loss, caractérise l affaiblissement que subit une onde électromagnétique lorsqu elle parcourt une… … Wikipédia en Français
Attenuation coefficient — For attenuation coefficient as it applies to electromagnetic theory and telecommunications see propagation constant. For the mass attenuation coefficient , see the article mass attenuation coefficient. The attenuation coefficient is a quantity… … Wikipedia
Mean free path — In physics, the mean free path is the average distance covered by a moving particle (such as an atom, a molecule, a photon) between successive impacts (collisions) [1] which modify its direction or energy or other particle properties. Contents 1… … Wikipedia
Mass attenuation coefficient — The mass attenuation coefficient is a measurement of how strongly a chemical species or substance absorbs or scatters light at a given wavelength, per unit mass. In addition to visible light, mass attenuation coefficients can be defined for other … Wikipedia
Clustering coefficient — In graph theory, a clustering coefficient is a measure of degree to which nodes in a graph tend to cluster together. Evidence suggests that in most real world networks, and in particular social networks, nodes tend to create tightly knit groups… … Wikipedia
Townsend coefficient — The first Townsend coefficient ( α ), also known as first Townsend avalanche coefficient is a term used in an ionization process where there is a possibility of secondary ionization because the primary ionization electrons gain sufficient energy… … Wikipedia
Average path length — is a concept in network topology that is defined as the average number of steps along the shortest paths for all possible pairs of network nodes. It is a measure of the efficiency of information or mass transport on a network. TOC ConceptAverage… … Wikipedia
Log-distance path loss model — The log distance path loss model is a radio propagation model that predicts the path loss a encounters inside a building or densely populated areas over distance.Applicable to / Under conditionsThe model is applicable to indoor propagation… … Wikipedia
Air mass coefficient — The air mass coefficient characterizes the solar spectrum after the solar radiation has traveled through the atmosphere. For a thickness l o of the atmosphere, the path length l through the atmosphere for solar radiation incident at angle θ… … Wikipedia
