Reversed preservation properties of some negative aging conceptions and stochastic orders

Reversed preservation properties of some negative aging conceptions are developed for the parallel and series system which are composed of independent and identical elements. If the system is of NWU(2) (IMRL, NWUC) properties then the elements is also of NWU(2) (IMRL, NWUC) properties. Reversed preservation properties of the right spread order and the total time on test transform order under the taking of maxima and minima are investigated respectively, applications in moments of NBUE ordered populations is presented as well. Supported by National Natural Science Foundation of China (10201010) and the Action Programming Funding of Lanzhou University