Results 1 - 10 of 2784
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[en] To reduce the magnetization loss of a coated conductor, the striation and the transposition have to be accomplished for magnetic decoupling. The loss reduction effect in incomplete as well as complete striated YBCO CCs was reported in previous research. At the case of the incomplete striated sample, the end region of the sample is non-striated. So, it is not jointed with each other. In power applications, the joint is needed because current leads must be connected with HTS coils. In this research, the influence of end-joint methods with copper and superconducting joint on magnetization loss in striated YBCO CC and spiral winding samples are presented and compared with non-striated measured result.
[en] The problem of renormalization scheme dependency that occurs when one employs mass independent renormalization is examined. In order to render this renormalization scheme viable in practical calculations, a way of decoupling heavy fields by demanding that the Appelquist-Carazzone theorem be satisfied at the outset is devised
[en] We perform the Hamiltonian analysis for a nonprojectable Horava model whose potential is composed of R and R2 terms. We show that Dirac's algorithm for the preservation of the constraints can be done in a closed way, hence the algebra of constraints for this model is consistent. The model has an extra, odd, scalar mode whose decoupling limit can be seen in a linear-order perturbative analysis on weakly varying backgrounds. Although our results for this model point in favor of the consistency of the Horava theory, the validity of the full nonprojectable theory still remains unanswered.
[en] A novel dual-feed (DF) low-dropout (LDO) is presented. The DF-LDO adopts dual control loops to maintain the output voltage. The dual control loops include a feedback loop and a feedforward loop. There is an equilibrium point in dual control loops, and the equilibrium point is the output voltage of the DF-LDO. In addition, the transient performance is optimized by adjusting the damping ratio and natural frequency. With a 1 μF decoupling capacitor, the proposed DF-LDO is fabricated in a 0.18 μm CMOS process and its output voltage is 1.5 V. When the workload changes from 100 μA to 100 mA in 100 ns, load regulation of 7 mV for a 100 mA step is achieved, the settling time is 997 ns and the undershoot is 12.8 mV; when the workload changes from 100 mA to 100 μA in 100 ns, the settling time is 249 ns with an imperceptible overshoot. (paper)
[en] The thesis of Brandbyge's comment [J. Chem. Phys. 140, 177103 (2014)] is that our operator decoupling condition is immaterial to transport theories, and it appeals to discussions of nonorthogonal basis sets in transport calculations in its arguments. We maintain that the operator condition is to be preferred over the usual matrix conditions and subsequently detail problems in the existing approaches. From this operator perspective, we conclude that nonorthogonal projectors cannot be used and that the projectors must be selected to satisfy the operator decoupling condition. Because these conclusions pertain to operators, the choice of basis set is not germane
[en] Based on the stochastic theory developed by Kubo and Anderson, we present an exact result of the decoherence function of a qubit in telegraphlike noises under dynamical decoupling control. We prove that for telegraphlike noises, the decoherence can be suppressed at most to the third order of the time and the periodic Carr-Purcell-Merboom-Gill sequences are the most efficient scheme in protecting the qubit coherence in the short-time limit.
[en] We propose to nest 3M layers of explicitly constructed Uhrig’s dynamical decoupling sequences of local control operators to achieve universal high-order protection of arbitrary and unknown M-qubit states on a 2M-dimensional computational subspace. This is the case even if the mechanism responsible for population leakage from the computational subspace is unclear and the actual form of system–environment coupling is not given. Simple numerical experiments are carried out to illustrate our theoretical proposal. (paper)
[en] This study proposes a design method for separation type three-dimensional isolated structure in which the horizontal and vertical isolation layers are separated for decoupling purpose. In this system, multiple guide rails are used vertically to limit the lateral displacements of upper structure while providing adequate overturning moment resistance. In this paper, a general formulation was proposed firstly to define two critical parameters, i.e., the rotation coefficient and the rotational displacement coefficient, the latter of which correlates the rotation-induced displacement and the total horizontal displacement. Subsequently, a separation type three-dimensional isolated structure model using the proposed method was established to evaluate its isolation effect through shaking table test, and a similar non-isolated structure model was also tested for comparison purpose. An analytical model was established for comparison to the experimental results. Experimental results show that the acceleration responses of the separation type three-dimensional isolated structure model are much less than the non-isolated model in both horizontal and vertical direction, demonstrating a desirable isolation effect for the isolated structure. In the meantime, the vertical guide rails benefits significantly to the overturning moment resistance.