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Phase-field simulation of radiation-induced bubble evolution in recrystallized U-Mo alloy
Yanbo Jiang,Yong Xin,Wenbo Liu,Zhipeng Sun,Ping Chen,Dan Sun,Mingyang Zhou,Xiao Liu,Di Yun 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.1
In the present work, a phase-field model was developed to investigate the influence of recrystallizationon bubble evolution during irradiation. Considering the interaction between bubbles and grain boundary(GB), a set of modified Cahn-Hilliard and Allen-Cahn equations, with field variables and order parametersevolving in space and time, was used in this model. Both the kinetics of recrystallization characterized inexperiments and point defects generated during cascade were incorporated in the model. The bubbleevolution in recrystallized polycrystalline of UeMo alloy was also investigated. The simulation resultsshowed that GB with a large area fraction generated by recrystallization accelerates the formation andgrowth of bubbles. With the formation of new grains, gas atoms are swept and collected by GBs. Thesimulation results of bubble size and distribution are consistent with the experimental results.
Discovery of Service HyperLinks with User Feedbacks for Situational Data Mashup
Chen Liu,Jianwu Wang,MeilingZhu,Yanbo Han 보안공학연구지원센터 2015 International Journal of Database Theory and Appli Vol.8 No.4
Discovery of loose data linkages between data services can help on-demand Web data integration in accordance with situation changes. However, we met the uncertainty challenge when discovering such data linkages with current automatic matchers. To handle the uncertainty problem, this paper develops a synthesized matching algorithm to combine the matching results from multiple automatic matchers with user feedbacks. It also proposes a service hyperlink model to encapsulate such data linkages for further reuse. Experiments show our approach can effectively improve the correctness of discovered data linkages.
A novel multi-objective tuning strategy for model predictive control in trajectory tracking
Jianqiao Chen,Guofu Tian,Yanbo Fu 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.12
Accuracy and efficiency are two important performances of model predictive control in trajectory tracking and they are seriously affected by the control parameters of model predictive control. To make the model predictive control with high accuracy and efficiency simultaneous, the paper proposed a strategy to tune the control parameters for model predictive control. The proposed strategy converts the tuning problem to a multi-objective optimization problem and employs non-dominated sorting genetic algorithm (NSGA-II) to solve it. The proposed strategy is employed to tune the control parameters for a classical model predictive control in a typical trajectory tracking condition. The simulation results show that the comprehensive performances of model predictive controller tuned by the proposed method are better than other tuning methods. The proposed tuning strategy is validated and it can be applied to tune the control parameters for model predictive control in trajectory tracking.
Study on the splitting failure of the surrounding rock of underground caverns
Li, Xiaojing,Chen, Han-Mei,Sun, Yanbo,Zhou, Rongxin,Wang, Lige Techno-Press 2018 Geomechanics & engineering Vol.14 No.5
In this paper splitting failure on rock pillars among the underground caverns has been studied. The damaged structure is considered to be thin plates and then the failure mechanism of rock pillars has been studied consequently. The critical load of buckling failure of the rock plate has also been obtained. Furthermore, with a combination of the basic energy dissipation principle, generalized formulas in estimating the number of splitting cracks and in predicting the maximum deflection of thin plate have been proposed. The splitting criterion and the mechanical model proposed in this paper are finally verified with numerical calculations in FLAC 3D.
The role and mechanism of lncRNA NEAT1 in the fibrosis of pulmonary epithelial cell
Hui Xu,YanBo Chen,Jinqiang Zhuang,Shun Zhu,Bing Xu,Jiang Hong 대한독성 유전단백체 학회 2020 Molecular & cellular toxicology Vol.16 No.2
Background Pulmonary fibrosis is a serious clinical fatal disease. Epithelial–mesenchymal transition (EMT) and lncRNA NEAT1 have been implied in its development and progression. Objective To study the role of lncRNA NEAT1 in the progression of fibrosis in human pulmonary epithelial cells (BEAS- 2B). Specifically, BEAS-2B was transfected with NEAT1 and miR-29c, EMT and cell proliferation were measured and the expression level of relevant genes was determined by Western blot. Result Results showed that NEAT1 promotes fibrosis and proliferation of BEAS-2B cells via the up-regulation of α-SMA, Vimentin, Snail and proliferation-related genes including Cyclin D1 and Cyclin E; miR-29c is a target gene of NEAT1 and through which NEAT1 regulates EMT and expression of proliferation-related genes. Conclusion This study investigated the mechanism of pulmonary fibrosis progression by elucidating the role of NEAT1/ miR-29c in the fibrosis and proliferation of BEAS-2B cells, thus providing a basis for the new therapeutic targets of pulmonary fibrosis.
Weihua Zhou,Yanbo Wangy,Zhe Chen 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper presents a vector fitting (VF) algorithmbased gray-box structure and parameters identification method for voltage source converter(VSC). Terminal impedance frequency responses of VSC is first measured by frequency scanning method. Then, these impedance frequency responses are fitted by a polynomial transfer function using VF algorithm. Finally, the theoretical terminal impedance formulas of possible control structures are compared with the fitted transfer function. The actual control structure can be selected, and the actual internal parameters can be identified. Simulation results are given to validate effectiveness of the proposed method. The proposed gray-box method can identify both the circuit and controller information even if no internal information of the VSC is provided by vendors due to industrial confidence. In addition, the effect of measurement noise on parameters identification accuracy can be mitigated by increasing the order of the fitted transfer function.
Improved Control Strategy for T-type Isolated DC/DC Converters
Dong Liu,Fujin Deng,Yanbo Wang,Zhe Chen 전력전자학회 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.4
T-type isolated DC/DC converters have recently attracted attention due to their numerous advantages, including few components, low cost, and symmetrical operation of transformers. This study proposes an improved control strategy for increasing the efficiency of T-type isolated DC/DC converters. Under the proposed strategy, the primary circulating current flows through the auxiliary switches (metal–oxide–semiconductor field-effect transistors) instead of their body diodes in free-wheeling periods. Such feature can reduce conduction losses, thereby improving the efficiency of T-type isolated DC/DC converters. The operation principles and performances of T-type isolated DC/DC converters under the proposed control strategy are analyzed in detail and verified through the simulation and experimental results.
Improved Control Strategy for T-type Isolated DC/DC Converters
Liu, Dong,Deng, Fujin,Wang, Yanbo,Chen, Zhe The Korean Institute of Power Electronics 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.4
T-type isolated DC/DC converters have recently attracted attention due to their numerous advantages, including few components, low cost, and symmetrical operation of transformers. This study proposes an improved control strategy for increasing the efficiency of T-type isolated DC/DC converters. Under the proposed strategy, the primary circulating current flows through the auxiliary switches (metal-oxide-semiconductor field-effect transistors) instead of their body diodes in free-wheeling periods. Such feature can reduce conduction losses, thereby improving the efficiency of T-type isolated DC/DC converters. The operation principles and performances of T-type isolated DC/DC converters under the proposed control strategy are analyzed in detail and verified through the simulation and experimental results.
The Analysis of Climate Change in Haiyan County
( Wenzheng Yu ),( Hanxiaoya Zhang ),( Tianliang Chen ),( Jing Liu ),( Yanbo Shen ) 한국인터넷정보학회 2020 KSII Transactions on Internet and Information Syst Vol.14 No.10
In this paper, the climate change in Haiyan County in recent decades was analyzed in detail with the methods of moving average, Mann-Kendall non-parametric mutation test and wavelet analysis. According to the variation trend of meteorological factors such as temperature, relative humidity, wind speed, pan evaporation and precipitation in recent decades, the climate of Haiyan County has a tendency of drought, which is becoming more and more serious. From the results of the analysis, the sunshine hours and the air temperature in Haiyan County have an obvious upward trend. The average surface temperature has increased by 2.75 ℃ from 1976, and its largest increase occurred in the late 1970s and 1980s. At this stage, the average surface temperature increased by 1.37 ℃. The relative humidity has a decreasing trend that has decreased by 2.75%. From 1976 to the present, there are two quasi-3a cycles and one quasi-6a cycle. The precipitation and evaporation showed the opposite change trend, in which the trend of precipitation fluctuated upward, while the trend of evaporation showed a fluctuating downward tendency, which led to the serious loss of water in the feeding area. The wind direction in Haiyan County are mainly from west to east, and its wind speed has a trend of slight increase.