Search

Your search keyword '"Li Ruifeng"' showing total 25 results
Start Over Author "Li Ruifeng" Publisher hindawi limited
25 results on '"Li Ruifeng"'

5. HDL-C/apoA-I Ratio Is Associated with the Severity of Coronary Artery Stenosis in Diabetic Patients with Acute Coronary Syndrome

Author

Sun, Lizhe, primary, Guo, Manyun, additional, Xu, Chenbo, additional, Qiao, Xiangrui, additional, Hua, Yiming, additional, Tuerhongjiang, Gulinigaer, additional, Lou, Bowen, additional, Li, Ruifeng, additional, Bai, Xiaofang, additional, Zhou, Juan, additional, Wu, Yue, additional, She, Jianqing, additional, and Yuan, Zuyi, additional

Published
2021
Full Text
View/download PDF

8. Prognostic Value of Admission Mean Corpuscular Volume for Major Adverse Cardiovascular Events following Stent Implantation in Nondiabetic and Diabetic Patients with Acute Coronary Syndrome

Author

Cheng, Lele, primary, Zhang, Lisha, additional, Liu, Junhui, additional, Li, Wenyuan, additional, Bai, Xiaofang, additional, Li, Ruifeng, additional, Li, Bolin, additional, Wang, Lijun, additional, Zhou, Juan, additional, Wu, Yue, additional, and Yuan, Zuyi, additional

Published
2020
Full Text
View/download PDF

13. Characteristics of Jerk Response Spectra for Elastic and Inelastic Systems

Author

Li Ruifeng, Chen Kui, and He Haoxiang

Subjects
Physics, Article Subject, Frequency band, Mechanical Engineering, Strength reduction, Mechanics, Amplification factor, Geotechnical Engineering and Engineering Geology, Condensed Matter Physics, lcsh:QC1-999, Spectral line, Physics::Geophysics, Computer Science::Robotics, Acceleration, Jerk, Amplitude, Mechanics of Materials, Ductility, lcsh:Physics, Civil and Structural Engineering
Abstract

Jerk is the time rate of acceleration and mainly represents the nonstationary component in high frequency band of the earthquake wave. The study on jerk and its response spectra can enhance the recognition of the nonstationary ground motion. The mechanical meaning and research value of jerk are described. Jerk is recommended to be solved by establishing state-space equations and Runge-Kutta method. The solution method of elastic and inelastic jerk response spectra under ground motion is established, and the accurate jerk spectrum should be calculated directly according to numerical computing instead of pseudo-acceleration spectrum. The characteristics of jerk response spectra are studied according to the influencing factors, such as site condition, amplification factor, ductility factor, and reduction factor. The concept of impact reduction factor is presented. The statistical results show that the jerk spectrum has similar rules as the acceleration spectrum, and the amplitude is relative to the predominant period, especially for structures with short or medium period. If the ductility is improved, the effective jerk will reduce obviously, and the impact reduction factor will be enhanced. Different from the strength reduction factor, the impact reduction factor is nearly not relevant to the period.

Published
2015

14. A free‐standing electrode based on 2D SnS2 nanoplates@3D carbon foam for high performance supercapacitors.

Author

Wang, Dongfeng, Yan, Xuehua, Zhou, Chen, Wang, Jingjing, Yuan, Xiaoxue, Jiang, Hui, Zhu, Yihan, Cheng, Xiaonong, and Li, Ruifeng

Subjects
SUPERCAPACITOR performance, SUPERCAPACITOR electrodes, ENERGY density, POWER density, ELECTRODES, ELECTRIC capacity, CARBON foams
Abstract

Summary: A reasonable formation of an electrode material with three‐dimensional (3D) microstructure for supercapacitors was proposed. Two‐dimensional (2D) SnS2 nanoplates were uniformly in situ grown on 3D carbon foam (CF) through a controllable strategy. The composite displayed excellent electrochemical performance due to the synergistic effect of SnS2 and CF. The SnS2@CF‐2 composite containing 23.92 wt% of SnS2 has a superior specific capacitance of 283.6 F g−1 at the current density of 1 A g−1. Moreover, a symmetric supercapacitor based on SnS2@CF‐2 composite has a capacitance of 82.5 F g−1 at 1 A g−1 and a high energy density of 13.9 Wh kg−1 at the power density of 551.7 W kg−1. [ABSTRACT FROM AUTHOR]

Published
2020
Full Text
View/download PDF

17. Durability Evolution of RC Bridge under Coupling Action of Chloride Corrosion and Carbonization Based on DLA Model

Author

He Haoxiang, Li Ruifeng, and Chen Kui

Subjects
Materials science, Article Subject, Carbonization, General Mathematics, lcsh:Mathematics, Condensation, General Engineering, lcsh:QA1-939, Chloride, Durability, Fractal, lcsh:TA1-2040, Forensic engineering, medicine, Gaseous diffusion, Coupling (piping), Composite material, Diffusion (business), lcsh:Engineering (General). Civil engineering (General), medicine.drug
Abstract

Chloride attack and carbonization are the main factors which affect the durability of concrete structures, and the respective theoretical models are systematically established. However, the quantitative analysis and models about the coupling effect of chloride attack and carbonization are less, so the precision and level of durability analysis of reinforced concrete are restricted. Diffusion-limited aggregation (DLA) model can finely simulate the process of gas diffusion and condensation with randomness and fractal characteristics, which is suitable for revealing the durability evolution process of the chloride attack, carbonization, and the coupling action in concrete. Based on the principle of DLA, considering the factors such as diffusion depth, concrete properties, and exposure conditions which influence the characteristics of chloride diffusion and carbonization, as well as the coupling effect, an integrated DLA model is established. The concentration of carbon dioxide and chloride at any time and any location can be obtained and dynamically displayed based on the DLA model. The performance predict method for concrete and steel bars considering fatigue effect is presented based on DLA, according to the demand for bridge durability analysis. Numerical examples show that the method can dynamically and intensively simulate the durability evolution process of reinforced concrete bridge.

Published
2015

Catalog

Books, media, physical & digital resources
See catalog results