Hardie plank siding is a premium brand of cement board siding (also known as fiber cement board siding) produced by the James Hardie Company.ardie plank can be purchased with a wood-grain look, a plain smooth look or a stucco type finish. Hardie plank also comes in simulated cedar shingle planks.
activity duration. Period (hours, days, weeks) required to complete an activity. Activities with zero duration are called milestones.
In chemical thermodynamics, activity (symbol a) is a measure of the âeffective concentrationâ of a species in a mixture, in the sense that the species' chemical potential depends on the activity of a real solution in the same way that it would depend on concentration for an ideal solution.