RESUMEN
The Laser Ranging Interferometer (LRI) instrument on the Gravity Recovery and Climate Experiment (GRACE) Follow-On mission has provided the first laser interferometric range measurements between remote spacecraft, separated by approximately 220 km. Autonomous controls that lock the laser frequency to a cavity reference and establish the 5 degrees of freedom two-way laser link between remote spacecraft succeeded on the first attempt. Active beam pointing based on differential wave front sensing compensates spacecraft attitude fluctuations. The LRI has operated continuously without breaks in phase tracking for more than 50 days, and has shown biased range measurements similar to the primary ranging instrument based on microwaves, but with much less noise at a level of 1 nm/sqrt[Hz] at Fourier frequencies above 100 mHz.
RESUMEN
A review of the history and development of the Urological Society of Australasia now the Urological Society of Australia and New Zealand. What's known on the subject? and What does the study add? The history of The Urological Society of Australasia was written by Sally Wilde and published by Hyland House in 1999.Whilst this documented geographical and numerical growth along with some structural changes, it did not discuss the change in and development of organisational structure. This paper describes how the growth of an organisation can at times proceed at a rate not matched by concurrent growth in organisational skill. The need for review of structure and the mechanism to affect change that matches and facilitates growth, together with some of the consequences are discussed.