We investigate the rate of convergence of solutions of some special cases of the equation , with positive parameters and nonnegative initial conditions. We give precise results about the rate of convergence of the solutions that converge to the equilibrium or period-two solution by using Poincaré's theorem and an improvement of Perron's theorem.

The error performance of a non-standard extremely long (143 km) operational SDH microwave radio-relay link has been extensively measured throughout 30 days of the usually worst period of the year, in order to investigate the consistence of practically achieved residual error performance with the migration of its defining parameter from the residual-bit-error-ratio (RBER) to the background-block-error-ratio (BBER), as coming out of the evolution of the relevant ITU-T performance standard from the bit-error-rate based to the more stringent block-error-rate based one, where, in turn, the latter practically does also include into the performance evaluation periods of deep fading. The close matching between the actual BBER-based RBER estimation and the native RBER objective found even on such a long hop, most likely is to be attributed to the space diversity, as the ultimate and most worthy protection measure in this case.

Birth order and its effect on growth and development of children and youths have rarely been studied so far. The objective of this research was an analysis of the birth order effects on some anthropometric properties of the boys 11-16 years old. The sample consisted of 748 boys from the Tuzla region. As the sample included very few boys born as the third, forth, or fifth child, we decided to consider only the differences in the mean values for some anthropometric parameters between the groups of the first- and the second-born. Measurements were taken according to IBP and the following parameters were investigated: body height, body mass, chest circumference, upper arm circumference, upper leg circumference, sitting height, arm length, leg length, pelvis width, shoulders width, length and width of head. We established that in most generations the firstborn boys have larger mean values for most anthropometric variables in comparison to the second-born.