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Comparison and Analysis of Magnetic-Geared Permanent Magnet Electrical Machine at No-Load

Xiping Liu Dong Chen Liang Yi Chao Zhang Min Wang
Archives of Electrical Engineering | 2014 | vol. 63 | No 4 December | 683-692 | DOI: 10.2478/aee-2014-0047
Keywords magnetic gear MGPM electrical machine quantitative comparison finite element analysis no load
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Abstract

Magnetic-geared permanent magnet (MGPM) electrical machine is a new type of machine by incorporating magnetic gear into PM electrical machine, and it may be in operation with low-speed, high-torque and direct-driven. In this paper, three types of MGPM machines are present, and a quantitative comparison among them is performed by finite element analysis (FEA). The magnetic field distribution, stable torque and back EMF are obtained at no-load. The results show that three types of MGPM machine are suitable for different application fields respectively according to their own advantages, such as high torque and back EMF, which form an important foundation for MGPM electrical machine research.
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Authors and Affiliations

Xiping Liu
Dong Chen
Liang Yi
Chao Zhang
Min Wang

Current status of phenolic pollution in urban lakes and its toxicity to cells – A case study of Xi’an, China

Min Wang Yutong Zhang Jingxin Sun Chen Huang Hongqin Zhai
Archives of Environmental Protection | 2023 | vol. 49 | No 1 | 63-73 | DOI: 10.24425/aep.2023.144738
Keywords Urban lakes phenolic compounds pollution ecological risk assessment
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Abstract

Liquid chromatography-mass spectrometry was used to detect and analyze phenolic compounds in the surface waters of four urban lakes in Xi’an – Hancheng Lake, Xingqing Lake, Nanhu Lake, and Taohuatan Lake. A total of 5 phenolic compounds were detected from the water samples, with a concentration range of ND-100.32 ng/L, of which bisphenol A (BPA) and nonyl phenol (NP) were the main types of phenolic compounds pollution in the four lakes. Pearson correlation analysis was used to analyze the concentration of phenolic compounds in the lake waters of Xi’an City and the water quality indicators COD, TP, NH3-N, DO, and pH during the same period. It was found that there was a significant positive relationship between the concentration of BPA and COD, the concentration of estradiol (17-beta-E2), estrone (E1) and TP and TN, the concentration of octylphenol (4-t-OP) and pH. The ecological risk assessment (ERA) shows that the concentration of BPA, 4-t-OP and NP in the lakes is at a medium risk level( is between 0.1–1), and that of E1 is at a high risk level (is greater than 1). Female cells (breast cancer cells) and male germ cells (testis cells) of mice were used as research objects to explore BPA and NP Toxic effect on mouse germ cells. BPA and NP at a concentration of 10-8 mol/L were found to have the most value-inducing effect on MCF-7 breast cancer cells positive for estrogen receptor. Obviously, both BPA and NP can induce the proliferation of testicular Sertoli cells
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Authors and Affiliations

Min Wang
1
Yutong Zhang
1
Jingxin Sun
1
Chen Huang
1
Hongqin Zhai
1
  1. Xi’an University of Technology, China

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