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  • 1
    Publication Date: 2018-06-16
    Description: The performance of the smart electric energy meter deteriorates during the operation, which will affects the accuracy of energy metering. In order to estimate the smart meter’s error during the operation, a method based on parameter degradation model is proposed. The meter’s degradation parameters and degradation acting parameters are determined, aiming at building parameter degradation model and putting forward error estimation constraint. Big data analysis methods are adopted in the process of solving degradation network. As the data are of multiple categories and data changing rates are variable, pre-processing method of differential normalized data is employed. Additionally, feed-forward neural network is adopted to approximate degradation characteristics, because elementary function is incapable of describing degradation network. Therefore, the smart meter’s error can be estimated according to the error estimation constraint, assuming degradation acting parameters pre-deter...
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 2
    Publication Date: 2018-10-24
    Description: The effect of welding parameters on metallographic microstructure of aluminum bronze, interfacial microstructure and bonding strength of aluminum bronze and steel substrate has been studied. A cladding of aluminum bronze was obtained on the surface of medium carbon steel by CMT welding and short circuiting transfer welding. The microstructure of aluminum bronze and the interfacial microstructure of the interface between aluminum bronze and steel substrate have been systematically investigated. Sample 1-4 are α + ( α + γ 2 ) microstructure of typical aluminum bronze. As for Sample 5, iron-rich particles and dendrites were distributed on the α -Cu crystal matrix. The bonding strength of aluminum bronze and steel substrate has been collected according to the destructive testing method of the bimetallic bonding strength of sliding bearing. Among the five samples, Sample 4 and Sample 5 had the highest bonding strength (528.17MPa and 511.39Mpa, resp...
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 3
    Publication Date: 2017-12-23
    Description: The theory of phase control of coherence, entanglement and quantum steering is developed for an optomechanical system composed of a single mode cavity containing a partially transmitting dielectric membrane and driven by short laser pulses. The membrane divides the cavity into two mutually coupled optomechanical cavities resulting in an effective three-mode closed loop system, two field modes of the two cavities and a mechanical mode representing the oscillating membrane. The closed loop in the coupling creates interfering channels which depend on the relative phase of the coupling strengths of the field modes to the mechanical mode. Populations and correlations of the output modes are calculated analytically and show several interesting phase dependent effects such as reversible population transfer from one field mode to the other, creation of collective modes, and induced coherence without induced emission. We find that these effects result from perfect mutual coherence betwee...
    Electronic ISSN: 1367-2630
    Topics: Physics
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  • 4
    Publication Date: 2018-01-06
    Description: Although nonequilibrium work and fluctuation relations have been studied in detail within classical statistical physics, extending these results to open quantum systems has proven to be conceptually difficult. For systems that undergo decoherence but not dissipation, we argue that it is natural to define quantum work exactly as for isolated quantum systems, using the two-point measurement protocol. Complementing previous theoretical analysis using quantum channels, we show that the nonequilibrium work relation remains valid in this situation, and we test this assertion experimentally using a system engineered from a trapped ion, adding external noise to produce the effects of decoherence. Our experimental results reveal the work relation's validity over a variety of driving speeds, decoherence rates, and effective temperatures and represent the first confirmation of the work relation for evolution described by a non-unitary master equation.
    Electronic ISSN: 1367-2630
    Topics: Physics
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