The use of time-frequency entropy to quantitatively assess the stability of alternating current square wave submerged arc welding process considering the distribution features of arc energy is reported in this paper. Time-frequency entropy is employed to calculate and analyze the current signals under different duty cycle, frequency and welding speed in the submerged arc welding process. It is ...

In this paper, we present a methodology and techniques for generating cycle-accurate macro-models for registertransfer (RT)-level power analysis. The proposed macro-model predicts not only the cycle-by-cycle power consumption of a module, but also the moving average of power consumption and the power profile of the module over time. We propose an exact power function and approximation steps to ...

This study presents a thermodynamic analysis of new combined power/refrigeration cycle. The cycle is comprised two innovative cycles: Kalina (KNC) and ejector refrigeration (ERC) for power production, respectively. Recovery heat process involved in the design to rise energetic exergetic efficiencies: emitted by KNC absorbed ERC order generate cooling. Effects variation operational conditions wh...

BACKGROUND AND PURPOSE The purpose of the study is to compare the reliability of the Barthel activities of daily living score, which assesses disability, with the Rankin scale, which assesses handicap, and to determine their mutual agreement. METHODS Fifty patients with stroke of varying severity were identified by a community-based stroke register and interviewed by two of three research nur...

In this dissertation we demonstrate the chaotic nature of certain special arithmetic quantum dynamical systems, using machinery from analytic number theory. We consider the quantized geodesic flow on finite-volume hyperbolic surfaces Γ\H, with Γ ⊂ SL 2 R consisting of the norm-1 units of an Eichler order in an indefinite quaternion algebra B over Q. Such Γ generalize the congruence subgroups of...