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549 results on '"Li, Xiaozhong"'

36. Eccentric Compression Behavior of Truss-Reinforced Cross-Shaped Concrete-Filled Steel Tubular Columns.

Author

Tao, Yu, Zhang, Sumei, Xiong, Gaopeng, Gong, Chao, Hou, Zhaoxin, and Li, Xiaozhong

Subjects
PEAK load, FAILURE mode & effects analysis, CONCRETE fatigue, STRESS concentration, STEEL tubes, ECCENTRIC loads, CONCRETE-filled tubes, COMPOSITE columns
Abstract

In the paper, the eccentric compression behavior of the truss-reinforced cross-shaped concrete-filled steel tubular (CCFST) column is investigated. A total of eighteen CCFST columns were tested under eccentric compression, and the key test variables included the reinforced truss node spacing (s = 140 mm and 200 mm), slenderness ratio (λ = 9.2, 16.6, and 23.1), and eccentricity ratio (η = 0, 0.08, and 0.15). The failure mode, deformation characteristic, stress distribution, strain distribution at the mid-span of the steel tube, and the eccentric compression bearing capacity were assessed. The results show that due to the addition of reinforced truss, the steel plates near the mid-span of eccentrically compressed CCFST columns experienced multi-wave buckling rather than single-wave buckling after the peak load was reduced to 85%, and the failure mode of concrete also changed from single-section to multi-section collapse failure. Comparisons were made with the unstiffened specimen. The ductility coefficient of the stiffened specimen with eccentricity ratios of 0.08–0.15 and node spacings of 140 mm~200 mm increased by 70~83%, approaching that of the multi-cell specimens with an increasing steel ratio of 1.8%. In addition, by comparing the test results with the calculation results of four domestic and international design codes, it was found that the Chinese codes CECS159-2018 and GB50936-2014, and the Eurocode 4 (2004) can be better employed to predict the compression bearing capacity of truss-reinforced CCFST columns. [ABSTRACT FROM AUTHOR]

Published
2024
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37. Serum copper and obesity among healthy adults in the National Health and Nutrition Examination Survey.

Author

Liu, Menglu, Fang, Changchang, Mei, Kaibo, Ling, Jitao, Fu, Wanying, Qi, Xinrui, Yu, Peng, Yan, Zhiwei, Xu, Liang, Zhao, Yujie, Li, Xiaozhong, and Liu, Xiao

Subjects
HEALTH & Nutrition Examination Survey, HOMEOSTASIS, COPPER, OBESITY
Abstract

Background: Copper (Cu) homeostasis are important processes in the cause of metabolic diseases, but the association between Cu and obesity remains unclear. Methods: Participants were drawn from the 2011–2016 National Health and Nutrition Examination Survey (NHANES). Weighted logistic regression assessed the associations of serum Cu concentrations (tertiles) with obesity and central obesity in individuals without comorbidities. Obesity was defined as a BMI ≥30.0 kg/m2, and central obesity was defined as a waist circumference ≥80 cm for women and ≥95 cm for men. Results: This cross-sectional study included 1,665 adults without comorbidities, representing 24,744,034 people (mean age 35.1 years, 48.5% female). High serum Cu levels (tertile 3: ≥19.19 μmol/L) were associated with higher odds of obesity (adjusted odds ratio [OR]: 4.48, 95% CI[confidence interval]: 2.44–8.32) and central obesity (OR: 2.36, 95% CI: 1.19–4.66) compared to low serum Cu levels (tertile 1: ≤15.64 μmol/L). The dose-response curve showed a nonlinear association between Cu levels and obesity (P-nonlinear = 0.02) and a linear association with central obesity (P-nonlinear = 0.21). Conclusion: This study suggests that higher serum Cu levels are associated with increased odds of obesity in healthy American adults. [ABSTRACT FROM AUTHOR]

Published
2024
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45. Anionic Defects Enhanced Ammonia Synthesis Over Ru Catalyst Supported on Barium Niobate Reduced with CaH2.

Author

Zhao, Yushi, Huang, Jia, Yuan, Mingwei, Li, Xiaozhong, Wang, Yan, Li, Mengwei, Li, Jinjun, and You, Zhixiong

Subjects
CATALYST supports, RUTHENIUM catalysts, AMMONIA, BARIUM, STOICHIOMETRY
Abstract

Anionic defects of H− (H∙O) and oxygen vacancies with trapped electrons (V∙O) have been built in the lattice of a hydrothermally derived perovskite (Ba5Nb4O15, BNO) by CaH2 reduction in Ar flow at 600 °C for 12 h. The formed anionic defects in the CaH2-reduced BNO (CaBNO) have been found to improve drastically the ammonia synthesis activity of Ru/CaBNO by donating electrons from both H∙O and/or V∙O to Ru atoms. The stoichiometry of H∙O and V∙O has been determined by TPR and TPO method, respectively. The H∙O defects have been proved to react with N2 under ammonia synthesis conditions via TPD, XPS measurements and isotope (D2) reaction, which provides secondary pathways for ammonia synthesis. Kinetic studies revealed that oxygen vacancies accept spilledover H atoms from Ru particles to alleviate the H2 poisoning effect. Cs-promoter has been demonstrated to accelerate the formation of anionic defects in CaBNO under ammonia synthesis reactions. Anionic defects (V∙O and H∙O) formed in the lattice of Ba5Nb4O15 perovskite via CaH2-reduction drastically promote the ammonia synthesis activity of Cs-Ru/CaBNO catalyst [ABSTRACT FROM AUTHOR]

Published
2024
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