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In a previous paper, by combining three techniques, i.e. Subdomain Decomposition Iterative Method (SDIM), Adaptive Cross Approximation (ACA), and Forward-Backward Spectral Acceleration (FBSA), from the Method of Moments (MoM), a high-efficiency calculation of the propagation and scattering in ducting maritime environments has been proposed. In this paper, this algorithm is updated by adding a perfectly conducting object above the sea surface, assumed to be highly conducting, which makes the environment very complex. Then, to quantify the effect of the object on the total scattered field, the coherent and incoherent powers, with and without object, are simulated by considering a surface of 800,000 unknowns (length of 6 km and a frequency of 5 GHz). [ABSTRACT FROM AUTHOR]

In this paper, we have studied the asymptotic approximation of inverse moment. Let {Zn} be non negative random variables, where the truncated random variables satisfy the Rosenthal-type inequality. Denote. The inverse momentcan be asymptotically approximated by, and the growth rate is presented as. Meanwhile, we obtain a resultfor a functionf(x) satisfying certain conditions. On the other hand, if, then the growth rate is presented as |E(a+Xn)− α/(a+EXn)− α− 1| =O(1/EXn). Our results generalize and improve some corresponding ones. Finally, some examples of inverse moment are illustrated. [ABSTRACT FROM AUTHOR]