Durham, United Kingdom

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    ABSTRACT: FPGAs are a ubiquitous electronic component utilised in a wide range of electronic systems across many industries. Almost all modern FPGAs employ SRAM based configuration memory elements which are susceptible to radiation induced soft errors. In high altitude and space applications, as well as in the nuclear and defence industries, such circuits must operate reliably in radiation-rich environments. A range of soft error mitigation techniques have been proposed but testing and qualification of new fault tolerant circuits can be an expensive and time consuming process. A novel method for simulating radiation-induced soft errors is presented that operates entirely within a laboratory environment and requires no hazardous exposure to radiation or expensive airborne test rigs. A system utilising modular redundancy is then implemented and tested under the new method. The test system is further demonstrated in conjunction with a software flight simulator to test single electronic modules in the context of active service on board a passenger aircraft and the effects of failure under radiation induced soft errors are observed. Our research proposes a test regime in which design strategies for self-healing circuits can be compared and demonstrated to work.
    12/2015; 38:277-282. DOI:10.1016/j.procir.2015.08.039
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    ABSTRACT: We construct Q-operators for the open spin-1/2 XXX Heisenberg spin chain with diagonal boundary matrices. The Q-operators are defined as traces over an infinite-dimensional auxiliary space involving novel types of reflection operators derived from the boundary Yang-Baxter equation. We argue that the Q-operators defined in this way are polynomials in the spectral parameter and show that they commute with transfer matrix. Finally, we prove that the Q-operators satisfy Baxter's TQ-equation and derive the explicit form of their eigenvalues in terms of the Bethe roots.
    Nuclear Physics B 09/2015; 901. DOI:10.1016/j.nuclphysb.2015.10.010
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    ABSTRACT: We report on the first completely simultaneous observation of a gamma-ray burst (GRB) using an array of Imaging Atmospheric Cherenkov Telescopes, which is sensitive to photons in the very high energy (VHE) γ -ray range (100 GeV). On 2006 June 2, the Swift Burst Alert Telescope (BAT) registered an unusually soft γ -ray burst (GRB 060602B). The burst position was under observation using the High Energy Stereoscopic System (HESS) at the time the burst occurred. Data were taken before, during, and after the burst. A total of 5 hr of observations were obtained during the night of 2006 June 2–3, and five additional hours were obtained over the next three nights. No VHE γ -ray signal was found during the period covered by the HESS observations. The 99% confidence level flux upper limit (> 1 TeV) for the prompt phase (9 s) of GRB 060602B is 2.9 × 10 −9 erg cm −2 s −1 . Due to the very soft BAT spectrum of the burst compared with other Swift GRBs and its proximity to the Galactic center, the burst is likely associated with a Galactic X-ray burster, although the possibility of it being a cosmological GRB cannot be ruled out. We discuss the implications of our flux limits in the context of these two bursting scenarios.


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Top publications last week by reads

Science 06/2008; 320(5878):889-92. DOI:10.1126/science.1136674
497 Reads
11/2015; 60(22). DOI:10.1007/s11434-015-0931-8
187 Reads

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