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Sökning: WFRF:(Weihs Erik)

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  • Joshi, Siddarth Koduru, et al. (författare)
  • Space QUEST mission proposal : experimentally testing decoherence due to gravity
  • 2018
  • Ingår i: New Journal of Physics. - : IOP Publishing. - 1367-2630. ; 20
  • Tidskriftsartikel (refereegranskat)abstract
    • Models of quantum systems on curved space-times lack sufficient experimental verification. Some speculative theories suggest that quantum correlations, such as entanglement, may exhibit different behavior to purely classical correlations in curved space. By measuring this effect or lack thereof, we can test the hypotheses behind several such models. For instance, as predicted by Ralph et al [5] and Ralph and Pienaar [1], a bipartite entangled system could decohere if each particle traversed through a different gravitational field gradient. We propose to study this effect in a ground to space uplink scenario. We extend the above theoretical predictions of Ralph and coworkers and discuss the scientific consequences of detecting/failing to detect the predicted gravitational decoherence. We present a detailed mission design of the European Space Agency's Space QUEST (Space-Quantum Entanglement Space Test) mission, and study the feasibility of the mission scheme.
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  • Weihs, Erik, et al. (författare)
  • Frequency quality in the nordic system 2040
  • 2020
  • Ingår i: 2020 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe). - : IEEE Computer Society. - 9781728171005 ; 2020 - October, s. 809-813
  • Konferensbidrag (refereegranskat)abstract
    • This paper proposes a method to estimate the total system kinetic energy and the corresponding frequency quality in the Nordic power system in 2040, based on different scenarios from the TSO utilizing estimated production data. The inertia estimation showed a lowered kinetic energy from an average of 223 GWs in 2019 to 175 GWs for 2040. In this paper an improved grid inverse is proposed to model the frequency control dynamics, where the frequency variation outside the normal band 50±0.1 Hz for 2040 was estimated. The number of events for the hour evaluated increased from 0.4% in 2019 to 1.1-5.0% in 2040 depending on distinct weather years, with an average of 2.8%. This indicates that the events outside the normal frequency band increase considerably for lower inertia conditions, suggesting a worsened frequency quality for 2040. 
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