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The variance per unit length of the column is taken as the ratio of the column length to the column efficiency in theoretical plates. The van Deemter equation is a hyperbolic function that predicts that there is an optimum velocity at which there will be the minimum variance per unit column length and, thence, a maximum efficiency. The van ...
Two resolved peaks in a chromatogram. The theoretical plate height is given by = where L is the column length and N the number of theoretical plates. [5] The relation between plate number and peak width at the base is given by = ().
AF4 is an alternative to HPLC and SEC in cases where column chromatography is not suitable for the analyte. HPLC or SEC would be used for liquid separations for molecules up to 1000 kDa and nanoparticles up to 10 nm. As the size increases above 10 nm, AF4 becomes superior in terms of resolution and recovery.
In order to calculate the average and standard deviation from aggregate data, it is necessary to have available for each group: the total of values (Σx i = SUM(x)), the number of values (N=COUNT(x)) and the total of squares of the values (Σx i 2 =SUM(x 2)) of each groups.
Around two-thirds, or 65%, of the 43 UN member countries in the region have had a female leader, and just under a quarter of them are currently being led by a woman.
More than two-thirds of retirees wish they had saved more and on a consistent basis — and half wish they hadn’t waited so long to focus on it, according to a new report.
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From January 2008 to December 2012, if you bought shares in companies when W. James McNerney, Jr. joined the board, and sold them when he left, you would have a -0.1 percent return on your investment, compared to a -2.8 percent return from the S&P 500.