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environmental coefficient

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  • Environmental radioactivity — is produced by radioactive materials in the human environment. While some radioisotopes, such as strontium 90 (90Sr) and technetium 99 (99Tc), are only found on Earth as a result of human activity, and some, like potassium 40 (40K), are only… …   Wikipedia

  • Coefficient of variation — In probability theory and statistics, the coefficient of variation (CV) is a normalized measure of dispersion of a probability distribution. It is also known as unitized risk or the variation coefficient. The absolute value of the CV is sometimes …   Wikipedia

  • Coefficient of performance — The coefficient of performance or COP (sometimes CP), of a heat pump is the ratio of the change in heat at the output (the heat reservoir of interest) to the supplied work. Contents 1 Equation 2 Derivation 3 Improving COP 4 …   Wikipedia

  • Partition coefficient — In chemistry and the pharmaceutical sciences, a partition (P) or distribution coefficient (D) is the ratio of concentrations of a compound in the two phases of a mixture of two immiscible solvents at equilibrium.[1] The terms gas/liquid partition …   Wikipedia

  • Phi coefficient — In statistics, the phi coefficient (also referred to as the mean square contingency coefficient and denoted by φ or rφ) is a measure of association for two binary variables introduced by Karl Pearson[1]. This measure is similar to the Pearson… …   Wikipedia

  • Glossary of environmental science — This is a glossary of environmental science.Environmental science is the study of interactions among physical, chemical, and biological components of the environment. Environmental science provides an integrated, quantitative, and… …   Wikipedia

  • Emission coefficient — is a coefficient in the power output per unit time of an electromagnetic source, a calculated value in physics. It is also used as a measure of environmental emissions (by mass) per MWh of electricity generated, see: Emission factor. Scattering… …   Wikipedia

  • Crop coefficient — Models of transpiration, or combined evapotranspiration (ET), from plants often combine an idealized or well calibrated reference crop response model with coefficients that account for differences in response observed for the crop of interest.… …   Wikipedia

  • metabolic coefficient — the metabolic relationship between fishes under various conditions, usually between fish of different size, different species, at various activity levels, or under various environmental conditions …   Dictionary of ichthyology

  • temperature coefficient — the quantitative increase or decrease in fish metabolic rate for each ten degree change in body or environmental temperature. Abbreviated as Q10 …   Dictionary of ichthyology

  • Diphényléthers polybromés — Polybromodiphényléther Structure chimique des PBDE Les polybromodiphényléther (PBDE) sont une suite de 209 produits chimiques différents, dont certains sont ou ont été utilisés pour ignifuger les produits plastiques et les textiles. Ils ont été… …   Wikipédia en Français

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