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In gas chromatography, the Kovats retention index (shorter Kovats index, retention index; plural retention indices) is used to convert retention times into system-independent constants. The index is named after the Hungarian-born Swiss chemist Ervin Kováts , who outlined the concept in the 1950s while performing research into the composition ...
Retention rate is a statistical measurement of the proportion of people that remain involved with a group from one time period to another. The concept is used in many contexts, including marketing, investment, education, employee management, research, and clinical trials.
The lake retention time for a body of water with the volume 2,000 m 3 (71,000 cu ft) and the exit flow of 100 m 3 /h (3,500 cu ft/h) is 20 hours.. Lake retention time (also called the residence time of lake water, or the water age or flushing time) is a calculated quantity expressing the mean time that water (or some dissolved substance) spends in a particular lake.
Retention ratio indicates the percentage of a company's earnings that are not paid out in dividends to shareholders but credited to retained earnings. It is the opposite of the dividend payout ratio , and is a key indicator of how much profit a company is keeping to fund its operations, growth, and development.
Customer retention: According to Frazier, ... Calculate your company’s gross profit by subtracting COGS from revenue (e.g., sales). Gross profit is a way to isolate your variable costs to ...
In chromatography, the retardation factor (R) is the fraction of an analyte in the mobile phase of a chromatographic system. [1] In planar chromatography in particular, the retardation factor R F is defined as the ratio of the distance traveled by the center of a spot to the distance traveled by the solvent front. [2]
The residence time of a fluid parcel is the total time that the parcel has spent inside a control volume (e.g.: a chemical reactor, a lake, a human body).The residence time of a set of parcels is quantified in terms of the frequency distribution of the residence time in the set, which is known as residence time distribution (RTD), or in terms of its average, known as mean residence time.
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