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1,202 results on '"Ma, Song"'

215. Alterations in mitochondrial biogenesis and respiratory activity, inflammation of the senescence‐associated secretory phenotype, and lipolysis in the perirenal fat and liver of rats following lifelong exercise and detraining

Author

Sun, Lei, primary, Li, Fang‐Hui, additional, Han, Chong, additional, Wang, Zhuang‐Zhi, additional, Gao, Ke‐Ke, additional, Qiao, Yi‐Bo, additional, Ma, Song, additional, Xie, Tian, additional, and Wang, Jing, additional

Published
2021
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222. Effect of deposition rate on microstructure and mechanical properties of wire arc additive manufacturing of Ti-6Al-4V components

Author

Zhang, Peilei, Jia, Zhi-yuan, Yan, Hua, Yu, Zhi-shui, Wu, Di, Shi, Hai-chuan, Wang, Fu-xin, Tian, Ying-tao, Ma, Song-yun, Lei, Wei-sheng, and Publica

Subjects
titanium alloy, deposition rate, cold metal transfer, wire and arc additive manufacturing
Abstract

Wire arc additive manufacturing (WAAM) is a novel manufacturing technique by which high strength metal components can be fabricated layer by layer using an electric arc as the heat source and metal wire as feedstock, and offers the potential to produce large dimensional structures at much higher build rate and minimum waste of raw material. In the present work, a cold metal transfer (CMT) based additive manufacturing was carried out and the effect of deposition rate on the microstructure and mechanical properties of WAAM Ti-6Al-4V components was investigated. The microstructure of WAAM components showed similar microstructural morphology in all deposition conditions. When the deposition rate increased from 1.63 to 2.23 kg/h, the ultimate tensile strength (UTS) decreased from 984.6 MPa to 899.2 MPa and the micro-hardness showed a scattered but clear decline trend.

Published
2021

238. Study of Al–SiO 2 Aesthetic Composite Coating on Orthodontic Metal Archwire.

Author

Wu, Haopeng, Yang, Jie, Yan, Yuwen, Zheng, Bowen, Algahefi, Ahmed Lotf, Ma, Song, and Liu, Yi

Subjects
METAL coating, COMPOSITE coating, PHYSICAL vapor deposition, MAGNETRON sputtering, NICKEL-titanium alloys, ELECTROLYTIC corrosion
Abstract

Nickel–titanium orthodontic wires (NTWs) play an essential role in orthodontic treatment. However, their corrosion and aesthetic properties limit their applications. To improve the aesthetic effects of nickel–titanium orthodontic archwires, we prepared aluminium–silicon dioxide (Al–SiO2) as a biocompatible layer coated onto the NTWs. The Al–SiO2 coating was first fabricated using physical vapor deposition magnetron sputtering, and its physicochemical and biocompatibility properties were investigated. Al–SiO2 layers were well coated on the NTWs. The corrosion currents in the nickel–titanium (NiTi) control, Al–SiO2-coated NiTi experimental, stainless steel (SS) control and Al–SiO2-coated SS experimental groups were 23.72 μA cm−2, 1.21 μA cm−2, 0.22 μA cm−2 and 0.06 μA cm−2, respectively. Al–SiO2-coated NTWs with reduced corrosion current density indicated that the preparation of Al–SiO2 coating on the surface of NiTi and SS could reduce the tendency of electrochemical corrosion. The friction coefficients of orthodontic wires in the NiTi control, NiTi experimental, SS control, and SS experimental groups were 0.68, 0.46, 0.58 and 0.45, respectively. A low friction coefficient was observed in the Al–SiO2-coated NTWs, and the reduced friction coefficient improved the efficiency of orthodontics. Furthermore, the excellent biocompatibility of the NTWs and SS coated with Al–SiO2 indicates that Al–SiO2 as a novel aesthetic layer could improve the physicochemical properties of NTW and SS without causing cytotoxicity, which has considerable potential for modification of NTW and SS surfaces. [ABSTRACT FROM AUTHOR]

Published
2022
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246. Optimization for the Starting Process of Turbofan Engine Under High-Altitude Environment

Author

Zhu Mingyan, Ma Song, Tan Jiangu, and Su Sanmai

Subjects
050210 logistics & transportation, General Computer Science, Computer science, Aircraft turbofan engine, 020208 electrical & electronic engineering, 05 social sciences, General Engineering, Regulator, Process (computing), 02 engineering and technology, Expression (mathematics), Turbofan, Nonlinear system, Control theory, 0502 economics and business, Genetic algorithm, 0202 electrical engineering, electronic engineering, information engineering, fuel supply optimization, Process control, Torque, General Materials Science, starting process, high altitude environment, lcsh:Electrical engineering. Electronics. Nuclear engineering, lcsh:TK1-9971
Abstract

The control of the starting process for turbofan engine is a difficult task, especially under high-altitude and low-temperature environment, where its characteristics are more complex and strongly nonlinear. In this paper, the working characteristics of the starting process were analyzed and the corresponding mathematical model was established first. In the starting process control problem, since the fuel supply act as the main control parameter, the model of the fuel regulator system was also built. Then, according to the control requirements and combined with models, an optimization expression for minimization of starting time with working and physical constraints was given. The genetic algorithm was utilized to solve the constrained optimization problem and the performance was compared with the classical one that is acquired from actual flight test data. Without exceeding the temperature bound, the starting time can be shortened by about 30%. Moreover, during the unloading process, the starting time in the plateau state and the highest exhaust temperature are reduced by 18.2% ~ 29.3% and 4.7% ~ 8.6%, respectively.

Published
2018

248. Studies on Ecological Monitoring of Plant Community and Plant Diversity in Shenzhen, Southern China

Author

Huang, Yuyuan, primary, Yu, Xinfan, additional, Liang, Hong, additional, Yang, Zhiming, additional, Wen, Haiyang, additional, Ye, Zhen, additional, Lu, Yunhe, additional, Wei, Ruoyu, additional, Yang, Lijun, additional, Ma, Song, additional, Zhao, Kangsai, additional, Wang, Fan, additional, Chen, Zhijie, additional, Yang, Huina, additional, Jiang, Chengxi, additional, Xu, Bin, additional, Wang, Weimin, additional, Xu, Wang, additional, Ming, Zhu, additional, Lin, Shizhen, additional, Liu, Hao, additional, Luo, Hualiang, additional, Deng, Suni, additional, Huang, Lijuan, additional, Lei, Yanjun, additional, Wan, Xiaoli, additional, Li, Yahe, additional, Zhou, Wanmin, additional, Zhao, Shun, additional, Duan, Zhenliang, additional, Liao, Dongyao, additional, Qiu, Xiaobo, additional, Huang, Haoqun, additional, and Jiang, Linlin, additional

Published
2021
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250. Synthesis of AuAg/Ag/Au open nanoshells with optimized magnetic plasmon resonance and broken symmetry for enhancing second-harmonic generation

Author

Zhou, Tao, primary, Ding, Si-Jing, additional, Wu, Zhi-Yong, additional, Yang, Da-Jie, additional, Zhou, Li-Na, additional, Zhao, Zhi-Rui, additional, Ma, Liang, additional, Wang, Wei, additional, Ma, Song, additional, Wang, Si-Man, additional, Zou, Jia-Nan, additional, Zhou, Li, additional, and Wang, Qu-Quan, additional

Published
2021
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