53,196 research outputs found
Deployment/retraction ground testing of a large flexible solar array
The simulated zero-gravity ground testing of the flexible fold-up solar array consisting of eighty-four full-size panels (.368 m x .4 m each) is addressed. Automatic, hands-off extension, retraction, and lockup operations are included. Three methods of ground testing were investigated: (1) vertical testing; (2) horizontal testing, using an overhead water trough to support the panels; and (3) horizontal testing, using an overhead track in conjunction with a counterweight system to support the panels. Method 3 was selected as baseline. The wing/assembly vertical support structure, the five-tier overhead track, and the mast-element support track comprise the test structure. The flexible solar array wing assembly was successfully extended and retracted numerous times under simulated zero-gravity conditions
Alternative subtraction scheme using Nagy Soper dipoles
We present an alternative subtraction scheme for the treatment of infrared
divergences in NLO QCD calculations. In this scheme, the number of
transformations is greatly reduced with respect to the standard subtraction
scheme by Catani and Seymour. We discuss the general setup of the scheme as
well as first applications to NLO processes at hadron and lepton colliders.Comment: 6 pages, 1 figure, presented at RADCOR 0
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