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Juanjuan Zhu, Joby B. Boxall, Andrew F. Hills, Rob S. Dwyer-Joyce, Sean R. Anderson and Richard P. Collins
The ability to detect early signs of failure in buried pipe infrastructure is necessary to facilitate the continued use of ageing infrastructure for delivery of society?s essential services and move beyond disruptive and expensive reactive maintenance an...
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Anirudh Thuppul, Peter L. Wright, Adam L. Collins, John K. Ziemer and Richard E. Wirz
Ionic liquid electrospray thrusters are capable of producing microNewton precision thrust at a high thrust?power ratio but have yet to demonstrate lifetimes that are suitable for most missions. Accumulation of propellant on the extractor and accelerator ...
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Jared M. Magnusson, Adam L. Collins and Richard E. Wirz
To better characterize the lifetime and performance of electrospray thrusters, electron emission due to electrode impingement by the propellant cation 1-ethyl-3-methylimidazolium (EMI+) has been evaluated with semi-empirical modeling techniques. Results ...
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Nolan M. Uchizono, Adam L. Collins, Anirudh Thuppul, Peter L. Wright, Daniel Q. Eckhardt, John Ziemer and Richard E. Wirz
Electrospray thruster life and mission performance are strongly influenced by grid impingement, the extent of which can be correlated with emission modes that occur at steady-state extraction voltages, and thruster command transients. Most notably, we ex...
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Philipp Thiessen, John Collins, Tom Buckland, Richard Abbell
Pág. 156 - 165
A model has been developed to improve the evidence for valuing the full benefits of highways maintenance spending on local roads in England. It predicts the quantifiable impacts of levels of road maintenance. It is recognised that there are constraints, ...
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Colin C. Triplett, Richard L. Collins, Kim Nielsen, V. Lynn Harvey and Kohei Mizutani
The meteorological control of gravity wave activity through ?ltering by winds and generation by spontaneous adjustment of unbalanced ?ows is investigated. This investigation is based on a new analysis of Rayleigh LiDAR measurements of gravity wave activi...
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