Superconducting single-charge transistor in a tunable dissipative environment

We study a superconducting single-charge transistor, where the coherence of Cooper pair tunneling is destroyed by the coupling to a tunable dissipative environment. Sequential tunneling and cotunneling processes are analyzed to construct the shape of the conductance peaks and their dependence on the dissipation and temperature. Unexpected features are found due to a cross-over between two distinct regimes, one `environment-assisted' the other `environment-dominated'. Several of the predictions have been confirmed by recent experiments. The model and results apply also to the dynamics of Josephson junction quantum bits on a conducting ground plane, thus explaining the influence of dissipation on the coherence.Comment: Strongly revied version as accepted by Phys. Rev. Let

Food, the UK and the EU: Brexit or Bremain?

This briefing paper explores the food terrain exposed by the wider “Brexit versus Bremain” Referendum question to be decided by the voting UK public on June 23. It is written to raise issues; to invite academics and civil society working on food matters to consider how their work fits this momentous issue; and to aid informed decisions. The paper follows from debates and concerns expressed at the 6th City Food Symposium on UK food and Brexit held on December 14, 2015

Manned geosynchronous mission requirements and systems analysis study add-on

An MOTV mission model was constructed in order to establish the baseline condition for SOC basing. A mission model to reflect satellite servicing was extended. Yearly traffic was projected. Driver missions were categorized. Cost trades and sensitivity to traffic rates were performed and service equipment needs were identified