The totals used for calculation are based on the sum of the individual categories presented in Google's source code, not the totals visualised on the front page of the archived data set for 23 March 2015, which differ slightly.
Standard methods for the SERR calculation are based on this equation, the difference between them basically being the way in which the derivative dC/da is obtained.
The properties of the nitrogen-selective membrane used in the calculation are based on measurements of nitrogen and hydrogen transport in vanadium at high temperatures (ca. 600 °C).
Despite the more popular application of this system until present, no method of design and analysis has been established, and approach for calculation are based on experience or simplification.
At present, the economic and environmental calculation are based on the operation only due to the difficulty in getting the correct values of the system cost and environmental impact as the system is to be optimized upon field testing and evaluation.
The mean and SD for the C1 calculation are based on information from the past 7 days.
