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  • Surfing the high energy output branch of nonlinear energy harvesters

    Mallick, Dhiman; Amann, Andreas; Roy, Saibal (2016)
    Embargo end date: 2016/11/14
    Hysteresis and multistability are fundamental phenomena of driven nonlinear oscillators, which, however, restrict many applications such as mechanical energy harvesting. We introduce an electrical control mechanism to switch from the low to the high energy output branch of a nonlinear energy harvester by exploiting the strong interplay between its electrical and mechanical degrees of freedom. This method improves the energy conversion efficiency over a wide bandwidth in a frequency-amplitude-...

    Bends in the plane with variable curvature

    Explicit formulae for planar variable curvature bends are constructed using Euler’s method of natural equations. The bend paths are expressed in terms of special functions. It is shown that the length of the different bend types varies linearly with increasing radius and that the curvature of variable curvature bends can be expressed as a multiple of the curvature of a circle.

    Performance analysis of the parallel acquisition of weak GPS signals

    This thesis provides a comprehensive analysis of the acquisition performance of the mobile-embedded Global Positioning System (GPS) receiver. Particular emphasis is given to the analysis of differentially coherent processing techniques and parallel acquisition strategies. New analytical expressions for the distribution of the decision variable of differentially coherent detectors are derived. In addition, new Gaussian approximations are derived and shown to be more accurate than existing appr...

    The effect of varying practitioner communication on patients' health status and treatment outcomes

    This is the protocol for a review and there is no abstract. The objectives are as follows: To assess the effects of interventions in which healthcare practitioner communication in face-to-face consultations with patients is experimentally varied in comparison to usual care or contrasted active control interventions, on patient health and treatment outcomes. A secondary aim is to investigate if the intervention effect is modified by intervention type, type of illness, length of follow-up, type...

    Family status and mutual fund performance

    Using a large and long sample of US and European mutual funds we examine the impact that the membership of a fund family has on performance. We test for strategic and competitive behaviour among family funds and whether this affects performance persistence and risk taking behaviour. We find no conclusive evidence of stronger performance persistence among family funds versus non-family funds, although we do find some significant differences in the future performance of portfolios of family and...
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