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Wenlei Li,Huixin Jin,Hongyan Xie,Duolun Wang,Ershuai Lei 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.120 No.-
Extensive research is being carried out to efficiently utilize electrolytic manganese residue (EMR) andconvert it into useful materials. In this paper, phase pure zeolite A (ZA) and zeolite X (ZX) were synthesizedby EMR for the first time. The EMR-based zeolites were characterized by XRD, TG, SEM and BET, andtheir zero point charges were tested. Then, the adsorption capacities of ZA and ZX on Mn ions were studied. On the adsorbent concentration = 3.0 g/L and C0 = 439 mg/L, the adsorption capacities of ZA and ZX onMn ion were 119.5 and 96.7 mg/g, respectively. In addition, the adsorption kinetics and isotherms of theadsorption process were discussed, and the adsorption mechanism was clarified by means of XRD, FTIR,SEM, and XPS. The appearance of Mn-O functional groups indicated that Mn ions did enter the bindingsites of zeolites. Moreover, ZA and ZX were successfully regenerated in this work. Furthermore, the influenceof coexisting cations was explored, and the maximum adsorption capacities of ZA and ZX were comparedwith other adsorbents, which proved the excellent adsorption of Mn ions by ZA and ZX. Inconclusion, the synthesized ZA and ZX were low-cost adsorption materials with high adsorption capacity.
Robust adaptive control of DC motor system fed by Buck converter
Feng Wei,Penglong Yang,Wenlei LI 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.10
For the Buck-fed DC motor system with parameter uncertainties and external disturbances, an adaptive robust controller is proposed based on dynamic surface control and slide mode control method. The derived adaptive robust control guarantees the closed-loop errors system is uniform ultimately bounded, and the parameters update laws are designed based on the uncertainty equivalence principle. The theoretical analysis and simulation results all reveal that the developed adaptive nonlinear robust controller is not sensitive to uncertainties of system, and owns simpler configuration and more accurate tracking performance than that of conventional backstepping control or PID control method.
Li, Qiaoluan,Liang, Haiyan,Dong, Wenlei,Zhang, Zhenguo Korean Mathematical Society 2008 대한수학회보 Vol.45 No.1
In this paper, we investigate nonoscillatory solutions of a class of higher order neutral nonlinear difference equations with positive and negative coefficients $\Delta^m(x(n)+p(n)x(\tau(n)))+f_1(n,x(\sigma_1(n)))-f_2(n,x(\sigma_2(n)))=0,\;n{\geq}n_0$. Some sufficient conditions for the existence of nonoscillatory solutions are obtained.
OSCILLATION OF NONLINEAR EQUATIONS ON TIME SCALES
Li, Qiaoluan,Liu, Zhiyong,Dong, Wenlei,Liang, Haiyan,Zhang, Zhenguo The Korean Society for Computational and Applied M 2009 Journal of applied mathematics & informatics Vol.27 No.1
By means of Riccati transformation techniques, we obtain some criteria which ensure that every solution of a nonlinear equation on time scales oscillates.
Multi-objective collaborative optimization using linear physical programming with dynamic weight
Haiyan Li,Mingxu Ma,Wenlei Zhang 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.2
The multi-objective collaborative optimization problem with multi-objective subsystems has a bi-level optimization architecture, that consists of the system and subsystem levels. Combining the multi-objective optimization algorithm with a bi-level optimization structure can obtain a satisfactory solution. Given that the preference-based algorithm requires minimal running time, the Linear physical programming (LPP) method, one of the typical preference-based algorithms, is adopted. Considering that setting the preference values for the incompatibility function is difficult, the weighted incompatibility function is added to the piecewise linear function of the LPP model. An expression of dynamic weight is also presented according to the inconsistency among the subsystems, which is caused by the sharing and auxiliary variables relative to the different subsystems. Using an engineering example, this study reveals that the interdisciplinary consistency is satisfactory when the dynamic weight is used in the LPP model, which thereby demonstrates the effectiveness of the presented method.
Oscillation of nonlinear equations on time scales
Qiaoluan Li,Zhiyong Liu,Wenlei Dong,Haiyan Liang,Zhenguo Zhang 한국전산응용수학회 2009 Journal of applied mathematics & informatics Vol.27 No.1
By means of Riccati transformation techniques, we obtain some criteria which ensure that every solution of a nonlinear equation on time scales oscillates. By means of Riccati transformation techniques, we obtain some criteria which ensure that every solution of a nonlinear equation on time scales oscillates.
Qiaoluan Li,Haiyan Liang,Wenlei Dong,Zhenguo Zhang 대한수학회 2008 대한수학회보 Vol.45 No.1
In this paper, we investigate nonoscillatory solutions of aclass of higher order neutral nonlinear dierence equations with positiveand negative coecients△m (x(n)+ p(n)x((n)))+f₁(n, x(σ₁(n)))f₂(n,x(σ₂(n))) = 0, n ≥n0. Some sucient conditions for the existence of nonoscillatory solutions areobtained.
CLASSIFICATION OF NONOSCILLATORY SOLUTIONS OF HIGHER ORDER NONLINEAR DIFFERENCE EQUATIONS
Ping, Bi,Li, Qiaoluan,Zhang, Zhengup,Dong, Wenlei 한국전산응용수학회 2001 The Korean journal of computational & applied math Vol.8 No.2
In this paper, we are mainly concerned with the classification of nonscillatory solutions for the higher order difference equation and some existence results for some kinds of nonoscillatory solutions. AMS Mathematics Subject Classification : 39A10
Effect of laser beam incidence angle on cladding morphology in laser cladding process
Guan Zhang,Wenlei Sun,Dongmei Zhao,Pengfei Fan,Feng Guo,Yong Huang,Pengfei Li 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.4
The change of angle θ between laser cladding powder plane and substrate plane will lead to changes in cladding layer's geometric morphology. Therefore, we established a quantitative numerical prediction model for cladding layer geometry. In this model, we consider the variation of θ, the laser energy attenuation rate and the temperature rise of the powder particles. At the same time, the simulation results were verified by experiments. The results show that when θ is in the range of 50°~90°, the initial temperature is 298 K, the scanning speed is 3.75 mm/s, and the laser spot diameter is 4.5 mm, the Fe#1 powder cladding can achieve better forming effect on Q235. In general, with the decrease of θ, the height of the cladding layer decreases and the width of the layer increases. However, when θ is less than 50°, the quality of the formed morphology significantly deteriorated. The experimental results are in good agreement with the simulation results, which verifies the validity and reliability of the model. This work provides a theoretical reference for further understanding the relationship between the laser cladding morphology and the incident angle.