activity parameters

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• Activity coefficient — An activity coefficient [ [http://www.iupac.org/goldbook/A00116.pdf Gold Book definition] ] is a factor used in thermodynamics to account for deviations from ideal behaviour in a mixture of chemical substances. In an ideal mixture the… …   Wikipedia

• Freshwater environmental quality parameters — are the natural and man made chemical, biological and microbiological characteristics of rivers, lakes and ground waters, the ways they are measured and the ways that they change. The values or concentrations attributed to such parameters can be… …   Wikipedia

• Voice activity detection — (also known as speech activity detection or, more simply, speech detection) is an algorithm used in speech processing wherein the presence or absence of human speech is detected in regions of audio. The main uses of VAD are in speech coding and… …   Wikipedia

• Margules activity model — Contents 1 Introduction 2 Equations 3 Excess Gibbs free energy 4 Activity coefficient 5 Extrema …   Wikipedia

• Prediction of volcanic activity — (also: volcanic eruption forecasting ) is an interdisciplinary scientific and engineering approach to natural catastrophic event forecasting. Volcanic activity prediction has not been perfected, but significant progress has been made in recent… …   Wikipedia

• Quantitative structure-activity relationship — (QSAR) is the process by which chemical structure is quantitatively correlated with a well defined process, such as biological activity or chemical reactivity.For example, biological activity can be expressed quantitatively as in the… …   Wikipedia

• Crohn's Disease Activity Index — The Crohn s Disease Activity Index or CDAI is a research tool used to quantify the symptoms of patients with Crohn s disease. This is of importance in research studies done on medications used to treat Crohn s disease; most major studies on newer …   Wikipedia

• Quantitative structure-activity relationship — Relation quantitative structure à activité Une relation quantitative structure à activité (en anglais : Quantitative structure activity relationship ou encore QSAR) est le procédé par lequel une structure chimique est corrélée avec un effet… …   Wikipédia en Français

• Schumann resonances — The Schumann resonances (SR) are a set of spectrum peaks in the extremely low frequency (ELF) portion of the Earth s electromagnetic field spectrum. Schumann resonances are global electromagnetic resonances, excited by lightning discharges in the …   Wikipedia

• UNIQUAC — (short for UN iversal QUA si C hemical) is an activitycoefficient model in which the activity coefficients, γ, of the components in achemical mixture can be related through their molar fraction,xi [Abrams D.S., Prausnitz J.M.,… …   Wikipedia

• UNIFAC — [ azeotrope calculated with UNIFAC at 1 atm. Red lines are vapor compositions and blue lines are liquid compositions. Image is rotating to more clearly show the saddle like shape of the Vapor Liquid Equilibria] The UNI versal F unctional A… …   Wikipedia