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The sources and ecological risk from sixteen polycyclic aromatic hydrocarbons in surface sediment in the Liaodong Bay were investigated from 2014 to 2015. The total concentrations of PAHs ranged from 88.5 to 347.1 ng/g, and the high value occurred in the central region of the Liaodong Bay. Cluster analysis identified two site clusters representing the coastal region affected by land-based pollution...
A new control method for three-phase-bridge inverter with improved neutral forming transformer (INFT) is presented in this paper. The controlling PWM signal is obtained by combining the switching point preset PWM and unipolar SPWM, and the fundamental and harmonic content of the controlling signal are analyzed. By analysis of the relationship of phasor voltage of neutral forming transformer, an improved...
Based on the thermal analysis of laser brazing CBN on the gear-honing-tool, the numerical simulation about thermal deformation on tooth profile has been implemented in the paper. During the laser brazing, the deformation mechanism on the tooth profile of gear-honing-tool from addendum to dedendum meets to buckling mechanism, upsetting mechanism and temperature gradient mechanism in turn. The tooth...
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