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Qin Qinghai,Qiu Yalan,Cai Bin 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.4
In this article, the multistage magnetic gearbox for wind turbine (WMGB) which contains two-stage magnetic gears (MGs) is studied. The MG is a coaxial MG and consists of outer rotor, modulator and inner rotor. First, the gear ratios of MGs are optimized based on the maximum gravimetric torque density under the constraint of structural parameters. Second, in view of the importance of the first-stage MG (FSMG), the multi-objective optimization method NSGA-II based on back propagation neural network surrogate model is combined with the single parameter scanning method to achieve higher torque performance of FSMG. The simulation results show that the torque density increases by 13.28%, the torque ripple of the modulator and inner rotor decreases to below 5%, and the maximum magnetic force exerted on the modulator is reduced by 22.73%, which verifies the effectiveness and efficiency of the proposed hierarchical optimization strategy. Finally, aiming at the aerodynamic load, the dynamic characteristics of FSMG are analyzed under different wind speed conditions, which verifies the feasibility of the proposed WMGB applied in MW-scale wind power drive systems.
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Xinrui Jing,Hongxia Wang,Songnan Li,Bin Lu,Jingxiang Zhao,Qinghai Cai 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.105 No.-
Graphic carbon nitride polymer was modified with transition bimetals compounds by impregnation ofpre-prepared g-C3N4 in aqueous solution of ammonium molybdate and vanadate. The prepared hybridmaterial was characterized by XRD, SEM, TEM, FT-IR, XPS and N2 adsorption–desorption techniques todetermine its surface morphology, composition and structure. The results revealed that VOx-MoOy singlemolecular layer incorporated into g-C3N4 molecule framework by interaction between host and guestwas fabricated. The hybrid composite was employed as catalyst for styrene oxidation to benzaldehydeusing molecular oxygen as oxidant. The results indicated that the composite was highly active and selectivefor styrene oxidation, giving TON 458.8 mol/mol(Mo+V) and 96.7% selectivity to benzaldehyde. Thecorrelation between high activity and surface properties the catalyst was explored.
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Family History of Cancer and Head and Neck Cancer Risk in a Chinese Population
Huang, Yu-Hui Jenny,Lee, Yuan-Chin Amy,Li, Qian,Chen, Chien-Jen,Hsu, Wan-Lun,Lou, Pen-Jen,Zhu, Cairong,Pan, Jian,Shen, Hongbing,Ma, Hongxia,Cai, Lin,He, Baochang,Wang, Yu,Zhou, Xiaoyan,Ji, Qinghai,Zho Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.17
Background: The aim of this study was to investigate whether family history of cancer is associated with head and neck cancer risk in a Chinese population. Materials and Methods: This case-control study included 921 cases and 806 controls. Recruitment was from December 2010 to January 2015 in eight centers in East Asia. Controls were matched to cases with reference to sex, 5-year age group, ethnicity, and residence area at each of the centers. Results: We observed an increased risk of head and neck cancer due to first degree family history of head and neck cancer, but after adjustment for tobacco smoking, alcohol drinking and betel quid chewing the association was no longer apparent. The adjusted OR were 1.10 (95% CI=0.80-1.50) for family history of tobacco-related cancer and 0.96 (95%CI=0.75-1.24) for family history of any cancer with adjustment for tobacco, betel quid and alcohol habits. The ORs for having a first-degree relative with HNC were higher in all tobacco/alcohol subgroups. Conclusions: We did not observe a strong association between family history of head and neck cancer and head and neck cancer risk after taking into account lifestyle factors. Our study suggests that an increased risk due to family history of head and neck cancer may be due to shared risk factors. Further studies may be needed to assess the lifestyle factors of the relatives.
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