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Chenghui Ma,Xiaoting Zhang,Xiaoting Zhang,Kang Wen,Rong Wang,Runping Han 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.1
Coating superparamagnetic iron oxide particles, i.e., Fe3O4, as adsorbents have major advantages over bare adsorbents for water treatment. As a versatile material, zirconium has been extensively studied for phosphate removal. In this study, the Fe3O4 core was pre-coated with branched polyethyleneimine (PEI) first, and then loaded with zirconium to result in a highly selective adsorbent (i.e., Zr-PEI@Fe3O4) for phosphate with a greatly broadened pH range. Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), BET surface area, and magnetization were used to characterize the resulting adsorbent and to explore the underlying adsorption mechanism. The adsorption performance of Zr-PEI@Fe3O4 toward phosphate was performed by batch experiment. The results showed that Freundlich model better fit the adsorption isotherms, while the Elovich equation better described the kinetic process. The maximum adsorption capacity of dephosphorization 32.2mg·g1 (according to P element) emerged in the condition of 1.0 g·L1 and pH at 2 with 303 K. The process was spontaneous and endothermic. Zr-PEI@Fe3O4 has the potential to remove phosphate from solution due to its easy separation and some good adsorption property.
Adsorption of phosphate from aqueous solution by lanthanum modified macroporous chelating resin
Xiaoting Zhang,Chenghui Ma,Kang Wen,Runping Han 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.5
A highly effective adsorbent of lanthanum-modified D751 resin (D751 resin for macroporous styrene chelated resin, sodium form) was prepared to enhance the effect of removing phosphate from solution. FTIR, SEM were used to explore the functional groups and structural features on the surface of D751-La; XPS analyzed the action mechanism between phosphate and D751-La. The adsorption performance about D751-La toward phosphate was investigated by batch experiment. The results showed that Langmuir, Freundlich, Temkin, Koble-Corrigan as well as Redlich-Peterson models fitted well for the adsorption isotherms. The adsorption kinetics could be better fitted by Double Constant, Elovich, and Pseudo-second-order model. The effect of salinity was not significant, such as Cl and SO4 2. When the solid-liquid ratio was 15 g·L1 with setting the reaction time as 8 h, the unit adsorption quantity of D751-La to phosphate (calculated in P) reached up to 26.3mg·g1 under the solution pH=3 at 293 K. The process was spontaneous and exothermic from thermodynamic analysis. It shows that D751-La has potential to remove phosphate from solution.
ESTIMATION OF BATTERY STATE-OF-CHARGE USING ν -SUPPORT VECTOR REGRESSION ALGORITHM
Qingsheng Shi,Chenghui Zhang,Naxin Cui 한국자동차공학회 2008 International journal of automotive technology Vol.9 No.6
Accurately estimating the SOC of a battery during the electric vehicle drive cycle is a vital issue that currently remains unresolved. A support vector regression algorithm (SVR), which has good nonlinear approximation ability, a quick convergence rate and global optimal solution, is proposed to estimate the battery SOC. First, the training data and the test data required in the estimation operation are collected using the ADVISOR software, followed by normalization of the data above. Then, cross validation and grid search methodologies are used to determine the parameters in the v-SVR model. Finally, simulation experiments have been carried out in the LIBSVM simulator. The simulation results show that, compared to the BP neural network algorithm, the v-Support Vector Regression algorithm performs better in estimating the battery SOC.
Filtering for Discrete-time Linear Noise Delay Systems
Peng Cui,Huanshui Zhang,Lihua Xie,Chenghui Zhang 제어·로봇·시스템학회 2009 International Journal of Control, Automation, and Vol.7 No.5
Optimal state estimation problem for discrete-time systems with delays in noise sequence is investigated. Predictor similar to the traditional Kalman ones is derived based on projection formula in Hilbert space. Filter and fixed-lag smoother are obtained at the same time. The estimators are presented by solving two coupled Riccati-type difference equations. One example shows the effectiveness of the proposed approach.
Wei Wang,Wei Wang,Chenghui Zhang 제어·로봇·시스템학회 2013 International Journal of Control, Automation, and Vol.11 No.6
In this paper, the stability and static output feedback stabilization problems for a class of nonlinear discrete-time singular switched systems are discussed. First, based on Lyapunov theory and the implicit function theorem, linear matrix inequalities sufficient conditions are developed which guarantee that the nonlinear discrete-time singular switched systems are regular, causal, have unique solution in a neighborhood of the origin, and are uniformly asymptotically stable. Then, with these conditions, and based on singular value decomposition approach, the design method of static output feedback controllers is given. Last, numerical examples are provided to illustrate the effectiveness of the proposed methods.
Liu Dan,Xing Ruinan,Zhang Quanyu,Tian Xiaoxiang,Qi Yanping,Song Haixu,Liu Yanxia,Yu Haibo,Zhang Xiaolin,Jing Quanmin,Yan Chenghui,Han Yaling 생화학분자생물학회 2023 Experimental and molecular medicine Vol.55 No.-
Autophagy plays an important role in the development of diabetic cardiomyopathy. Cellular repressor of E1A-stimulated genes 1 (CREG1) is an important myocardial protective factor. The aim of this study was to investigate the effects and mechanisms of CREG1 in diabetic cardiomyopathy. Male C57BL/6 J mice, Creg1 transgenic mice and cardiac-specific knockout mice were used to establish a type 2 diabetes model. Small animal ultrasound, Masson’s staining and western blotting were used to evaluate cardiac function, myocardial fibrosis and autophagy. Neonatal mouse cardiomyocytes (NMCMs) were stimulated with palmitate, and the effects of CREG1 on NMCMs autophagy were examined. CREG1 deficiency exacerbated cardiac dysfunction, cardiac hypertrophy and fibrosis in mice with diabetic cardiomyopathy, which was accompanied by exacerbated autophagy dysfunction. CREG1 overexpression improved cardiac function and ameliorated cardiac hypertrophy and fibrosis in diabetic cardiomyopathy by improving autophagy. CREG1 protein expression was decreased in palmitate-induced NMCMs. CREG1 knockdown exacerbated cardiomyocyte hypertrophy and inhibited autophagy. CREG1 overexpression inhibited cardiomyocyte hypertrophy and improved autophagy. LAMP2 overexpression reversed the effect of CREG1 knockdown on palmitate-induced inhibition of cardiomyocyte autophagy. CREG1 inhibited LAMP2 protein degradation by inhibiting the protein expression of F-box protein 27 (FBXO27). Our findings indicate new roles of CREG1 in the development of diabetic cardiomyopathy.
Liu, Wenxia,Chen, Qi,Zhang, Yuying,Qiu, Guobing,Lin, Chenghui The Korean Institute of Electrical Engineers 2014 Journal of Electrical Engineering & Technology Vol.9 No.6
A reliability model of wind farm located in mountainous land with complex terrain, which considers the cable and wind turbine (WT) failures, is proposed in this paper. Simple wake effect has been developed to be applied to the wind farm in mountainous land. The component failures in the wind farm like the cable and WT failures which contribute to the wind farm power output (WFPO) and reliability is investigated. Combing the wind speed distribution and the characteristic of wind turbine power output (WTPO), Monte Carlo simulation (MCS) is used to obtain the WFPO. Based on clustering algorithm the multi-state model of a wind farm is proposed. The accuracy of the model is analyzed and then applied to IEEE-RTS 79 for adequacy assessment.
Wenxia Liu,Qi Chen,Yuying Zhang,Guobing Qiu,Chenghui Lin 대한전기학회 2014 Journal of Electrical Engineering & Technology Vol.9 No.6
A reliability model of wind farm located in mountainous land with complex terrain, which considers the cable and wind turbine (WT) failures, is proposed in this paper. Simple wake effect has been developed to be applied to the wind farm in mountainous land. The component failures in the wind farm like the cable and WT failures which contribute to the wind farm power output (WFPO) and reliability is investigated. Combing the wind speed distribution and the characteristic of wind turbine power output (WTPO), Monte Carlo simulation (MCS) is used to obtain the WFPO. Based on clustering algorithm the multi-state model of a wind farm is proposed. The accuracy of the model is analyzed and then applied to IEEE-RTS 79 for adequacy assessment.
Peng Longgui,Wang Rong,Cheng Huanquan,Zhang Liangqing,He Yugang,Yin Chenghui,Zhang Xin 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.7
Coal gangue (CG) has dense structure and excellent internal crystallization. After modification, its pore structure can be enlarged and become an adsorptive material with good adsorption performance, which is a good idea to recover solid waste of CG to a certain extent. At the same time, the content of organic matter in the wastewater of medical intermediate is high. Modified CG can be used as an ideal material for the adsorption treatment of medical intermediate wastewater. Herein, the CG was treated with three activation methods of high-temperature calcination, freezing microwave and acidification treatment to investigate their adsorption behavior to p-hydroxybenzenesulfonic acid. SEM, FTIR, XRD, XPS and BET were used to study the microstructure of raw and modified CG. The relationship between the activation methods and the structure of the CGs was established. The specific surface area of calcined CG increases obviously, which is attributed to the elimination of interlayer water. Acidification treatment can effectively activate the chemical structure of CG surface. By using ultraviolet spectrophotometer, both the kinetics and thermodynamics of the adsorption processes are investigated and fitted with the kinetic equations and adsorption thermodynamic equations. Results indicate that the CG treated with acidification method has the best adsorption effect on p-hydroxybenzenesulfonic acid, and the maximum removal rate reaches 85.34%. The quasi-second-order rate equation and Freundlich model are adopted to analyze the adsorption kinetics and thermodynamics, and results show that the adsorption process includes both physical adsorption and chemisorption. Overall, the relationships of activation method-microstructure-adsorption performance are revealed, which is significant to guide the application of CG in the adsorption field.