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RISS 인기검색어
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- 저자 : Ruiqi Guo (검색결과 3 건)
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Ruiqi Guo,Zengwei Guo,Yueyi Shi 대한토목학회 2022 KSCE Journal of Civil Engineering Vol.26 No.2
To accurately describe the uncertainty of chloride diffusion coefficient of concrete under tensile and compressive stresses, an iterative algorithm is proposed to reduce the influence of the uncertainty of prior variance on the posterior results. Subsequently, a probabilistic prediction model is developed to take into account the stress effect on chloride diffusion coefficient by using a Bayesian algorithm and Markov Chain Monte Carlo (MCMC) method. The existing deterministic model is adopted as prior model for this probabilistic model, and 180 sets of chloride diffusion coefficient data under different stresses obtained from 23 published journal papers are used as posterior information for this probabilistic model. The accuracy of the proposed model is validated by comparing with the experimental samples and other existing models. Analysis results show that the proposed probabilistic prediction model provided a reasonable confidence interval of the correction coefficient of stress effect on chloride diffusion coefficient. The provided iterative algorithm reduce the length of confidence interval with the exact prediction precision.
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Congcong Li,Ruiqi Li,Yuhang Wang,Runhan Niu,Qilong Guo,Changsen Zhang 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.126 No.-
A series of manganese-based oxide catalysts were synthesized by the hydrothermal method. By adjustingthe doping amounts of W and Cu in the system to study the catalytic performance of transition metaldopedmanganese oxides on soot combustion. They were deeply studied through various characterizationsand theoretical calculations. The results show that Wand Cu doping modifications can significantlyimprove the activity of manganese-based oxides in soot oxidation. W-Cu0.1/MnOx prepared by comodificationofWand Cu at 395 C can convert 90% of soot into CO2. The multiple characterization resultsshow that by adjusting the doping amount of copper and tungsten, the nano-flower-like morphology canbe obtained and the crystal plane can be reconstructed, which is helpful to increase the specific surfacearea, Mn3+ content, and oxygen vacancy content. The theoretical calculation results show that the oxygenvacancy on the surface of the catalyst shows the ability to activate O2 and H2O, and they show noncompetitiveadsorption. In addition, W-Cu0.1/MnOx has a good application prospect in the catalytic oxidationof soot because of its excellent catalytic stability. This work provides a reference for the designand preparation of non-noble metal-based catalysts for the elimination of soot particles from dieselengine exhaust.
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Dynamic numerical analysis of single-support modular bridge expansion joints
Wancheng Yuan,Xinzhe Yuan,Ruiqi Li,Jian’guo Wang 국제구조공학회 2016 Steel and Composite Structures, An International J Vol.22 No.1
Severe fatigue and noise problems of modular bridge expansion joints (MBEJs) are often induced by vehicle loads. However, the dynamic characteristics of single-support MBEJs have yet to be further investigated. To better understand the vibration mechanism of single-support MBEJs under vehicle loads, a 3D finite element model of single-support MBEJ with five center beams is built. Successive vehicle loads are given out and the vertical dynamic responses of each center beams are analyzed under the successive loads. Dynamic amplification factors (DAFs) are also calculated along with increasing vehicle velocities from 20 km/h to 120 km/h with an interval 20 km/h. The research reveals the vibration mechanism of the single-support MBEJs considering coupled center beam resonance, which shows that dynamic responses of a given center beam will be influenced by the neighboring center beams due to their rebound after the vehicle wheels depart. Maximal DAF 1.5 appears at 120 km/h on the second center beam. The research results can be utilized for reference in the design, operation and maintenance of singlesupport MBEJs.
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