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Electrochemical degradation of phenol on the La and Ru doped Ti/SnO2-Sb electrodes
Haiqing Xu,Yue-Ming Sun,Ai-Ping Li,Qi Qi,Wei Jiang 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.9
La and Ru doped Ti/SnO2-Sb electrodes were prepared by thermal decomposition and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). It confirmed that the surface of the La and Ru doped Ti/SnO2-Sb electrodes presents a certain microspherical structure formed by aggregates of nanoparticles, which increases the specific area greatly and provides more active sites. The enhanced performance of the La and Ru doped electrodes arose from the increased adsorption capacity of hydroxyl radicals. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) showed an improvement of the electrochemical capacity for the La and Ru doped Ti/SnO2-Sb electrodes. The electrochemical oxidation performance of the prepared electrode was further studied using phenol as a model pollutant. UV scans revealed that both phenol and its intermediate products are more rapidly decomposed, especially in the early stage of oxidation on the La and Ru doped electrodes. The removals of chemical oxygen demand (COD) were 86.4% and 82.1% on the Ti/SnO2-Sb-La and Ti/SnO2-Sb-Ru electrodes, respectively, which were higher than that on the SnO2-Sb/Ti electrode (60.1%). The doped electrodes are demonstrated to have superior electrochemical oxidation ability for phenol.
Yao Li,Haiqing Si,Yitong Zong,Xiaojun Wu,Peihong Zhang,Hongyin Jia,Shuqing Xu,Dayong Tang 한국항공우주학회 2021 International Journal of Aeronautical and Space Sc Vol.22 No.6
The process of obtaining flight data from flight test is complex and costly, which makes it difficult to identify aerodynamic parameters. Therefore, Cessna172 flight simulator was used for flight data extraction, which ensures the convenience, efficiency and economy of the test. To obtain aerodynamic model, based on the idea of machine learning, a recurrent neural network was used to process multi-dimensional nonlinear flight test data, and a real-time recursive learning algorithm was proved to be suitable for dynamic training. Due to the large amount of state parameter data generated by aircraft, which will cause the real-time recursive learning algorithm to train slowly. So, Kalman filter algorithm was introduced for system identification. Considering validity analysis, the comparative verification method was used to verify system identification model. Results show that the aircraft aerodynamic and aerodynamic moment models have good applicability and can be popularized and applied.
Tong Zhang,Xuetao Lyu,Haiqing Liu,Yang Yu,Yang Xu 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.3
Based on the reasonable determination of material constitutive relationship and interaction model between concrete and steel tube, a fi nite element model of T-shaped stiff ened concrete-fi lled steel tube (TSCFST) stub column exposed to uniform fi re was established, and model reliability was verifi ed. Through the FE model, the working mechanism of the model in the whole process of loading was analyzed in detail. In the process of axial compression, the load distributions of steel tube and concrete, and the interaction between steel tube and concrete were discussed. This paper analyzed the eff ects of the main factors on residual bearing capacity of TSCFST stub columns, and put forward the calculation formula of the residual bearing capacity of TSCFST stub columns after uniform fi re exposure.
Jun Zou,Yingzhen Qi,Lele Su,Yun Wei,Zhaolei Li,Haiqing Xu 한국고분자학회 2018 Macromolecular Research Vol.26 No.13
An aliphatic polyester based poly(ester amide)s (PEA) consisting of poly (L-lactic acid) and poly(butylene succinate) was successfully prepared via chain extension reaction of poly(L-lactic acid)-dicarboxylic acid (PLLA-COOH) and poly(butylene succinate)-dicarboxylic acid (PBS-COOH) using 2,2'-bis(2-oxazoline) as a chain extender. PLLA-COOH was obtained by direct polycondensation of L-lactic acid in the presence of 1, 4-succinic acid. PBS-COOH was synthesized by condensation polymerization of 1,4-butylene glycol with excessive succinic acid. The structures of PLLA-COOH, PBS-COOH, and PEAs were characterized by fourier transform infrared (FTIR) and 1H nuclear magnetic resonance (1H NMR). The molar masses were determined by gel permeation chromatography (GPC). The thermal properties of PLLACOOH, PBS-COOH, and PEAs were characterized by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The lattice parameters of PLLACOOH, PBS-COOH, and PEAs were investigated by X-ray diffraction (XRD). Furthermore, The mechanical properties were characterized by tensile testing and notch Izod impact testing. The FTIR and 1H NMR results demonstrated the formation of PLLA-COOH, PBS-COOH, and PEAs. The GPC measurements showed that the molar masses of copolymer PEAs decreased with increasing PBS-COOH content. The TGA analysis confirmed that the introduction of PBS improved the thermal properties. DSC data indicated that the melting temperatures of the PEAs were lower than that of the prepolymers. The results of XRD suggested that the PLLA crystal structures was destroyed by the PBS units, and the crystallization of the PEAs mainly attributed to the PBS chain segments.The introduction of PBS units into the polymer structure improved the toughness of PLLA, which was detected in mechanical properties.