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254 results on '"Zhang, Zifan"'

51. Proteomic analysis revealed the function of PoElp3 in development, pathogenicity and autophagy through the tRNA-mediated translation efficiency in the rice blast fungus

Author

Sun, Ting, primary, Li, Yuyong, additional, Liu, Yuanhao, additional, Wang, Xianjun, additional, Xie, Jiahui, additional, Bai, Huimin, additional, Hu, JiaYi, additional, Zhang, Zifan, additional, Li, Xiuxiu, additional, Wang, Zonghua, additional, Zheng, Huakun, additional, and Lin, Guifang, additional

Published
2023
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55. A Novel 3-D Space Vector Modulation Strategy for Open-End Winding PMSM

Author

Zhang, Zifan, Wang, Xueqing, Xiao, Dianxun, Zhou, Yu, He, Mingzhi, Wang, Zheng, Zhang, Zifan, Wang, Xueqing, Xiao, Dianxun, Zhou, Yu, He, Mingzhi, and Wang, Zheng

Abstract

To fully suppress the current harmonics of torque plane and zero-sequence dimension in open-end winding (OW) permanent-magnet synchronous motor (PMSM), a novel 3-D space vector pulsewidth modulation (SVPWM) strategy is proposed in this article. First, the distribution of 3-D space vectors is analyzed. Then, a subspace-based vector selection method is developed to utilize the adjacent vectors in space to synthesize the reference vector. On this basis, a repetitive controller is equipped for zero-sequence current to guarantee precise current tracking. By using the proposed 3D-SVPWM strategy, the current controls in 3D can be well balanced. Besides, the fault-tolerant control of open-phase fault in OW PMSM drive is realized with the proposed 3D-SVPWM strategy by simply changing zero-sequence current reference. The experiments are carried out to prove the effectiveness of the proposed strategy.

Published
2023

56. Design and Analysis of a Hybrid-Excited Doubly Salient Generator With Symmetric Phases Based on Long Pitch Field Sources

Author

Gao, Mengzhen, Yang, Xiangyu, Cao, Jianghua, Jiang, Siyuan, Zhao, Shiwei, and Zhang, Zifan

Abstract

To solve the asymmetric problems of each phase caused by the different relative positions of the armature coils and excitation sources (PMs and excitation coils) in traditional three-phase hybrid-excited doubly salient generator (HEDSG), a novel HEDSG with long pitch field sources is proposed in this paper. Because of the adoption of excitation winding wound around the PMs sandwiched “four-teeth”, the symmetric magnetic circuits among phases can be achieved, thus the balanced three-phase back electromotive force (EMF) curves can be obtained. First, the configuration of proposed HEDSG is described, based on which its operation principle is discussed from the perspective of magnetic circuits. Besides, the flux regulation principle is analyzed based on the simplified equivalent magnetic circuit model. Then, a multi-step design optimization method is implemented to determine optimal structural parameters. Whereafter, the effect of the bidirectional excitation on the static and dynamic performances of the proposed HEDSG is investigated, which demonstrates it has a strong flux regulation ability. Furthermore, a comparative study between the proposed and traditional HEDSGs is conducted. It is shown that the proposed HEDSG can essentially solve the asymmetric problem among phases and possesses the merits of lower cogging torque and higher output power. Finally, a prototype of the proposed HEDSG is fabricated and tested so as to experimentally verify the analysis and simulation.

Published
2024
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57. Parameter Design of DCMG System Under Large Signal Stability and Static Voltage Constraints

Author

Zhang, Zifan, Yang, Xiangyu, Zhao, Shiwei, Wu, Danlan, Gao, Mengzhen, and Wang, Zhidong

Abstract

DC microgrid (DCMG) is characterized by a high degree of power electronics, low system inertia, and CPL (CPL) with a negative damping feature. Its system-level transient stability is of great concern. The stability of a DCMG system is affected by many factors, such as component parameters, load types, converter control methods, etc. To analyze the system-level stability of the DCMG, the constraints of large signal stability of the DCMG based on droop control are derived by using the Lyapunov direct method. Based on this conclusion, the influence of system parameters on large signal stability and voltage deviation of the DCMG is revealed, and the optional range of filter element parameters and droop coefficient under the stability and voltage constraints is proposed. The parameter selection work involves two evaluation indicators, system stability, and voltage deviation. This article uses the variable weight coefficient method to normalize these two indicators into a comprehensive evaluation index, and the appropriate droop coefficient is selected based on the optimal comprehensive evaluation index. The work of this article has reference values for the parameter design of the DCMG system components and the selection of the droop coefficient.

Published
2024
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75. Image data filtering and automatic detection of damages within asphalt with the help of ground-penetrating radar (GPR) and machine learning methods

Author

ZHANG, ZIFAN (author) and ZHANG, ZIFAN (author)

Abstract

Damages within asphalt have been interesting phenomena in asphalt engineering, the detection of which is significant for maintenance of road sections. This project focuses on cracks and delaminations. An attempt was made to filter radar image data with a method based on a VNA-antenna-multilayered system model as well as the data from two specific measurements, aiming at better visualizing cracks as well as other features in radar image, and the results were checked and analysed. This part of work has provided an application of the aforementioned method of radar image data filtering as well as the points worth noticing and avoiding when making this application. For delaminations, machine learning algorithms, first the EM algorithm and then the YOLO v3 algorithm, were used as an attempt to highlight and detect them. Though the results still need improving, it is still valuable that the workload for human intervention can be alleviated with the help of these algorithms and that better performance can be expected based on current work, with the increasing amount of data with high quality achieved in the future., Applied Geophysics | IDEA League

Published
2022

76. Highly applicable small hydropower microgrid operation strategy and control technology

Author

Chen Zhifeng, Xiangyu Yang, Yeqiong Zheng, Zhang Zifan, and Zhidong Wang

Subjects
Small hydro, Microgrid, business.industry, Computer science, 020209 energy, Reliability (computer networking), Failure rate, Grid-connect and island control strategy, 02 engineering and technology, Island operation, Energy storage, Small hydropower, Reliability engineering, General Energy, 020401 chemical engineering, 0202 electrical engineering, electronic engineering, information engineering, Key (cryptography), lcsh:Electrical engineering. Electronics. Nuclear engineering, Electricity, 0204 chemical engineering, business, lcsh:TK1-9971, Hydropower
Abstract

In this paper, a small hydropower microgrid solution with high applicability is proposed to solve the problem of high line failure rate and long maintenance time, which can improve the reliability of distribution network in mountainous areas. In this scheme, small hydropower and local load constitute a low-cost but efficient microgrid operation to improve the reliability of rural electricity. In this scheme, small-sized hydropower and local load constitute microgrid operation. In case of failure, the scheme makes full use of the independent operation of microgrid to provide qualified power quality to local load. This scheme is easy to realize and does not need additional energy storage, so it has good economy. Firstly, the frequency disturbance characteristics of small hydropower microgrid is analyzed, which lays a theoretical foundation for small hydropower microgrid operation. Then it introduces the island operation mode to grid-connected operation mode transition of small hydropower, including the key technologies such as frequency adjustment strategy in island operation stage. Finally, the simulation studies show the effectiveness of the method.

Published
2020

83. Preparation and selectivity evaluation of grafted temperature-responsive imprinted composite polyvinylidene fluoride resin membranes for selective adsorption of ReO4−

Author

Zhang, Jun, primary, Ou, Xiaojian, additional, Li, Lin, additional, Chen, Qianqian, additional, Zhang, Zifan, additional, Huo, Ting, additional, Lin, Xiaoyu, additional, Niu, Fangfang, additional, Zhao, Shengyuan, additional, We, Fang, additional, Li, Hui, additional, Liu, Chunli, additional, Chen, Zhenbin, additional, Lu, Sujun, additional, Zhang, Peng, additional, and Zhu, Jinian, additional

Published
2021
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87. Preparation and selectivity evaluation of grafted temperature-responsive imprinted composite polyvinylidene fluoride resin membranes for selective adsorption of ReO4−.

Author

Zhang, Jun, Ou, Xiaojian, Li, Lin, Chen, Qianqian, Zhang, Zifan, Huo, Ting, Lin, Xiaoyu, Niu, Fangfang, Zhao, Shengyuan, We, Fang, Li, Hui, Liu, Chunli, Chen, Zhenbin, Lu, Sujun, Zhang, Peng, and Zhu, Jinian

Subjects
POLYVINYLIDENE fluoride, COMPOSITE membranes (Chemistry), FOURIER transform infrared spectroscopy, ADSORPTION (Chemistry), ADSORPTION capacity, ACRYLIC acid, JET engines
Abstract

Purpose: A novel grafted temperature-responsive ReO4− Imprinted composite membranes (Re-ICMs) was successfully prepared by using polyvinylidene fluoride (PVDF) resin membranes as substrates, this study aimed to separate and purify ReO effectively. Design/methodology/approach: Re-ICMs were synthesized by PVDF resin membranes as the substrate, acrylic acid (AA), acrylamide (AM), ethylene glycol dimethacrylate (EGDMA) were functional monomers. The morphology and structure of Re-ICMs were characterized by scanning electron microscope and Fourier transform infrared spectroscopy. Findings: The maximum adsorption capacity toward ReO4− was 0.1,163 mmol/g and the separation decree had relation to MnO4− was 19.3. The optimal operation conditions were studied detailedly and the results as follows: the molar ratios of AA, AM, EGDMA, ascorbic acid, NH4ReO4, were 0.8, 0.96, 0.02, 0.003 and 0.006. The optimal time and temperature were 20 h and 40°C, respectively. The Langmuir and pseudo-second-order models were fit these adsorption characteristics well. Practical implications: Rhenium (Re) is mainly used to chemical petroleum and make superalloys for jet engine parts. This study was representing a technology in separate and purify of Re, which provided a method for the development of the petroleum and aviation industry. Originality/value: This contribution provided a novel method to separate ReO4− from MnO4−. The maximum adsorption capacity was 0.1163 mmol/g at 35°C and the adsorption equilibrium time was within 2 h. Meanwhile, the adsorption selectivity rate ReO4−/MnO4− was 19.3 and the desorption rate was 78.3%. Controlling the adsorption experiment at 35°C and desorption experiment at 25°C in aqueous solution, it could remain 61.3% of the initial adsorption capacity with the adsorption selectivity rate of 13.3 by 10 adsorption/desorption cycles, a slight decrease, varied from 78.3% to 65.3%, in desorption rate was observed. [ABSTRACT FROM AUTHOR]

Published
2023
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89. Inhibiting Phase Transfer of Protein Nanoparticles by Surface Camouflage–A Versatile and Efficient Protein Encapsulation Strategy

Author

Zhang, Pei, primary, Li, Cong, additional, Huang, Tianhe, additional, Bai, Yuancheng, additional, Quan, Peng, additional, Li, Wei, additional, Zhang, Zifan, additional, Zhang, Feng, additional, Liu, Zehua, additional, Wan, Bowen, additional, Correia, Alexandra, additional, Zhang, Jie, additional, Wu, Xuri, additional, Hirvonen, Jouni T., additional, Santos, Hélder A., additional, Fan, Jin, additional, Cai, Ting, additional, and Liu, Dongfei, additional

Published
2021
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92. Dual-functional photocatalyst of CoSx/Cd0.7Zn0.3S without noble metals for efficient selective benzaldehyde synthesis coupled with H2productionElectronic supplementary information (ESI) available. See DOI: https://doi.org/10.1039/d3cy01162c

Author

Chen, Xinan, Yu, Jiaqi, Zhang, Zifan, Zhang, Zizhong, Ji, Tao, and Su, Wenyue

Abstract

Coupling hydrogen production with selective organic synthesis in one cooperative manner offers a novel strategy for green synthesis by virtue of the photogenerated carriers. Herein, a dual-functional photocatalyst of CoSx/Cd0.7Zn0.3S without noble metals is reported for efficient selective benzaldehyde (BAD) synthesis coupled with H2production. The CoSx/Cd0.7Zn0.3S composite showed a higher photocatalytic performance than Cd0.7Zn0.3S and 1 wt% Pt/Cd0.7Zn0.3S, which was attributed to the loaded CoSx, as the cocatalyst, which could accumulate the photogenerated electrons from Cd0.7Zn0.3S, promote the separation of photogenerated charge carriers, and reduce the overpotential of hydrogen production. This study provides a new strategy for the design and synthesis of low-cost, high-efficiency composite materials for photocatalytic efficient selective benzaldehyde (BAD) synthesis coupled with H2production.

Published
2023
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95. PSCAD Simulation of Transformer Inrush Current with Different Influencing Factors

Author

Wang Gan, Zhang Shanru, Lin Kaiming, Yu Weihong, Zhang Zifan, Li Binbin, and Chen Ronghui

Subjects
Control theory, Computer science, law, Waveform, Transformer, Inrush current, Magnetic flux, Voltage, law.invention
Abstract

This article mainly studies the characteristics of transformer inrush current and the influence of different factors on transformer inrush current. This article states the background and significance of the inrush current, introduces the research status of the inrush current and the suppression technology. The suppression of the inrush current is the root of the problem. The mechanism of the inrush current is derived mathematically from the magnetic flux relationship, and the characteristics of the inrush current are analyzed through its related waveform diagrams. On this basis, the harm of inrush current is introduced. The core method is based on the PSCAD simulation platform to build the inrush current and the circuit to suppress the inrush current, and to set the parameters for simulation model. This article discusses the effects of transformer capacity, closing angle, knee voltage and basic parameters on inrush current.

Published
2020

96. Intelligent Distribution Network Information Processing Based on Power Data Virtual Plane

Author

Guo Lin, Wang Zhidong, Yongjun Zhang, Ni Yingdong, Zhang Zifan, Deng Fengqiang, Yang Ling, Chen Zhifeng, Wang Gan, Zhengbin Pu, and Feng Ruijue

Subjects
Computer science, Distributed computing, 02 engineering and technology, layered processing, lcsh:Technology, virtual plane, lcsh:Chemistry, Component (UML), 0202 electrical engineering, electronic engineering, information engineering, Forwarding plane, General Materials Science, Instrumentation, distribution network, lcsh:QH301-705.5, Fluid Flow and Transfer Processes, business.industry, lcsh:T, Process Chemistry and Technology, 020208 electrical & electronic engineering, General Engineering, Process (computing), Information processing, Software development, power data, 021001 nanoscience & nanotechnology, Telecommunications network, Data warehouse, lcsh:QC1-999, Computer Science Applications, Data sharing, lcsh:Biology (General), lcsh:QD1-999, lcsh:TA1-2040, 0210 nano-technology, business, lcsh:Engineering (General). Civil engineering (General), lcsh:Physics
Abstract

Due to the diversity and complexity of distribution networks, the classical modular software development method may face the difficulty in modular division, data sharing and collaboration of different specialties. Inspired by the idea of separating the control plane from the data forwarding plane in software-defined networking (SDN), a method of power data virtual plane is proposed in this paper to improve software development efficiency. Layered processing of power data virtual plane is designed to meet the diversity characteristics of intelligent distribution network and the multi-source and heterogeneous characteristics of information. This paper introduces the design idea and implementation process of virtual plane in detail. The main component of the power data virtual plane, power data warehouse and application scheduling are presented. Finally, the performance of the proposed virtual plane method is verified by practical distribution network examples with different communication networks and information.

Published
2020

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