The reserve costs of China Petro-Chemical Corporation from 1986 to 2002 are calculated by the different statistical methods of year mean, cumulativemean and running mean.
Mean annual increment — the cumulative volume of a forest stand at the end of each decade divided by the number of years the stand has been in existence.
平均年度增量——森林每十年末占有的累积容量除以已经在此生存的年数。
3
A cumulative damage model is proposed, which can be used to consider the influence of in plane bi-axial stresses and mean stress on the fatigue behavior of unidirectional laminates.