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Jie Li,Weiqiang Wang,Chengqing Wu,Zhongxian Liu,Pengtao Wu 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.42 No.3
This paper studies the lateral impact behavior of ultra-high performance fiber-reinforced concrete (UHPFRC) filled double-skin steel tubular (UHPFRCFDST) columns. The impact force, midspan deflection, and strain histories were recorded. Based on the test results, the influences of drop height, axial load, concrete type, and steel tube wall thickness on the impact resistance of UHPFRCFDST members were analyzed. LS-DYNA software was used to establish a finite element (FE) model of UHPFRC filled steel tubular members. The failure modes and histories of impact force and midspan deflection of specimens were obtained. The simulation results were compared to the test results, which demonstrated the accuracy of the finite element analysis (FEA) model. Finally, the effects of the steel tube thickness, impact energy, type of concrete and impact indenter shape, and void ratio on the lateral impact performances of the UHPFRCFDST columns were analyzed.
A Modified Reversible Data Hiding in Encrypted Images Using Random Diffusion and Accurate Prediction
Ming Li,Zhongxian Peng,Hai Nan 한국전자통신연구원 2014 ETRI Journal Vol.36 No.2
A modified version of Zhang’s reversible data hiding methodin encrypted images is proposed in this letter. To make full useof spatial correlation in natural images, the former idea ofblock division is thoroughly abandoned, whereas the randomdiffusion strategy is used. Additionally, the fluctuationmeasurement of pixels containing embedded data is improvedby accurate prediction. The experiment results reveal that ourproposed method is superior to both Zhang’s method and thelater improved version proposed by Hong and others.
Guiying Li,Zhigang Yu,Zhongxian Wang 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.6
This paper investigates guidance scheme for missile with actuator failure and dynamics of autopilot. Firstly, considering first-order dynamics of autopilot, the guidance model with actuator failure is established. Secondly, an adaptive sliding mode fault-tolerant guidance law is designed on the basis of passive fault-tolerant technique and a novel nonsingular fast terminal sliding mode (NFTSM) manifold. Then, the adaptive algorithm with the feature of low-pass filter is proposed to ensure that adaptive parameters are bounded when the sliding mode is non-ideal. Finally, Lyapunov stability theory is adopted to prove that the states of closed-loop system are practical finite-time stability. Simulation results demonstrate the effectiveness and robustness of the proposed guidance strategy under the certain actuator failure.
Qiulin Zhang,Jinhui Zhang,Zhongxian Song,Ping Ning,,Hao Li,Xin Liu 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.34 No.-
The SO42 /CeO2 catalyst showed excellent catalytic activity and remarkable resistance to H2O and SO2for the selective catalytic reduction of NO with NH3. The SO42 /CeO2 catalyst with 2.5 wt.% SO42 contentexhibited more than 90% of NO conversion at 229–485 8C. The characterization results revealed that theSO42 species were highly dispersed on the surface of CeO2 in the SO42 /CeO2 catalyst. Moreover, theaddition of SO42 into CeO2 obviously increased the surface Lewis and Brønsted acid sites, and it wasfound that only stable (1 1 1) lattice planes of CeO2 can be observed on the SO42 /CeO2 catalyst.
Jun Zhu,Yao Li,Ying-Ying Tang,Jian-Qi Liu,Yi-Yu Chen,Zhongxian LV,Fang Liu 한국응용곤충학회 2020 Journal of Asia-Pacific Entomology Vol.23 No.1
The Hemipteran predator, Cyrtorhinus lividipennis, feeds on the eggs and nymphs of rice planthoppers and leafhoppers. We previously demonstrated that sublethal concentrations of imidacloprid stimulated the reproduction of C. lividipennis. Considering the essential roles of juvenile hormone (JH) in insect reproduction, we speculated that sublethal concentrations of imidacloprid may stimulate the reproduction of C. lividipennis by regulating JH level. To test this, we cloned C. lividipennis JH acid methyl transferase (ClJHAMT) and JH esterase (ClJHE), which are responsible for JH biosynthesis and degradation genes, respectively. We then knocked down ClJHAMT by injecting dsRNA into C. lividipennis nymphs and found that emerging female adults exhibited 88.8% lower expression of the vitellogenin gene (ClVg) and the number of eggs was reduced by 41.5% as compared with controls. Silencing ClJHE increased ClVg mRNA expression by 275.0% but did not affect fecundity. A sublethal concentration of imidacloprid (LC 20 ) increased the JH titer in females by 35.3% and 60.6% at 24 and 48 h post-emergence, respectively. In treatments containing both imidacloprid and dsJHAMT, the silencing of CLJHAMT reduced the number of eggs produced by adult females by 21.4% as compared to the control (imidacloprid + dsGFP). Our results indicated that sublethal concentration of imidacloprid may induce C. lividipennis reproduction by upregulating JH level via JHAMT. The finding could provide valuable information for improved integration of C. lividipennis and insecticides in pest management.