Peng-Fei Zhu

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We reported on the generation of versatile soliton molecules in a fiber laser mode-locked by a microfiber-based graphene saturable absorber (GSA). By virtue of the highly nonlinear effect of the microfiber-based GSA, the soliton molecules could be easily observed. In addition to regular soliton molecules, it is found that the "soliton atoms" in molecules(More)
Feature selection is viewed as an important preprocessing step for pattern recognition, machine learning and data mining. It is used to find an optimal subset to reduce computational cost, increase the classification accuracy and improve result comprehensibility. In this paper, a weighted distance learning approach is introduced to minimize Leaving-One-Out(More)
This paper presents an optimization control strategy for power control of VSC-HVDC under unbalanced grid voltage conditions. For simple implementation and flexible operation, the current references are derived and synthesized into one generalized equation introducing two individually adaptable parameters. The two parameters can be adapted to eliminate the(More)
A split root system consisting of two compartments was installed to study the effects of nitrogen form and its supply position on the growth of maize seedlings under partial root-zone water stress. Polyethylene glycol (PEG 6000) was added to the nutrient solution in one compartment to simulate partial root-zone water stress, while nitrogen was set as three(More)
A novel micro ultrasonic motor for multi-channel actuator control is proposed. It is composed of a stator constituted with a ring and two rod-shaped transducers and two cone shaped rotors. Two rod-shaped transducers have rectangular cross section, where four sets of piezoelectric element are bolted. Two sets excite longitudinal vibrations of the bars, and(More)
In the title mol-ecule, C(18)H(13)Cl(2)F(3)N(4)O(2), the intra-molecular distance between the centroids of the benzene and pyridine rings is 3.953 (3) Å, and the trifluoro-methyl group is rotationally disordered over two orientations in a 0.678 (19):0.322 (19) ratio. The crystal packing exhibits weak inter-molecular C-H⋯F inter-actions.
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