The phrase "an approximation of when" is correct and usable in written English.
It can be used when discussing an estimated time or date for an event or occurrence.
Example: "We have an approximation of when the project will be completed, but it may change based on unforeseen circumstances."
Alternatives: "an estimate of when" or "a rough idea of when".
It is reasonable to regard (P_{d_{1}}) as an approximation of (P_{d_{2}}) when the PU signal α p(n) and the SU signal s(n) are within the same or close order of magnitude.
Although the cumulative risk does not give an estimate of the risk of developing cancer over a lifetime, it has been used as an approximation of this when the truncated upper age band is chosen as an age close to the average life expectancy of the population.
Line up the new door Have your helper hold the door up in an approximation of where the old door was when open.
Although this alternative method for measuring ARIs gives, in some studies, a better approximation of when APD90 occurs, it lacks the theoretical foundation of the Wyatt method, which in any case is designed to indicate tR, not MAP90, with the assumption that tR occurs near APD50.
There is an approximation of the issues when the topic addresses to identify vulnerabilities, usually the main objective of security testing.
One way of putting a value to P S is by measuring the cost of food safety systems and using this as an approximation of P S. When looking at the part of P* that is attributable of S, one can use the output price differential between buyers who are willing to accept safer products and those who accept products that are less safe.
A new book I've helped shepherd (or doula) into print, Get What's Yours: The Secrets to Maxing Out Your Social Security, was conceived after an approximation of tennis four years ago, when the guy across the court, Boston University economist and friend Larry Kotlikoff asked my own Social Security plans.
Although the 1% RBC turnover model may provide an approximation of elimination rates when ke is unknown and 1st order kinetics cannot be calculated, use of alternative models (such as the 1% RBC turnover model) would result in underestimating predicted blood Hg concentrations at any given time, in addition to underestimating the time for elimination of Hg from blood.
But the replicator equation is only an approximation of the strategy evolution when the population size is sufficiently large, which implies that small fitness differences can influence the dynamics.
Finally, it is important to note that the electrode array with 8-mm IED provides an approximation of about 4 mm when locating the IZ [ 26].
The average blast hit coverage of Brachypodium gene homologs in the entire assembly, referred to as assembly coverage (AC) represents an approximation of the theoretically optimal situation, when each gene is contained within a single DNA sequence (i.e. no fragmentation).
