The report Investigates scattering from a rough surface when transmitter and receiver are at a finite distance from each other, so that the sphericity of the incident and scattered waves has to be taken into account. The calculation is complicated by the fact that, unlike the case of plane waves, the equlprobabillty planes of the surface do not coincide with the equlphase surfaces, and therefor...

A strong decline is apparent in annual District Average Rainfall (DAR) for District 71, located in the Snowy Mountains of New South Wales (Fig. 1). There has been some concern that this decline of about 200 mm, i.e. about 20 per cent, since 1913 could be the result of human interference with the environment, and that a continuing decline in rainfall could threaten ecosystems and irrigation. The...