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Synthesis and characterization of carboxymethyl cellulose/organic montmorillonite nanocomposites and its adsorption behavior for Congo Red dye

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Water Science and Engineering 2013年第3期6卷 272-282页

作者： min-min wang Li wang College of Material Science and Art Design Inner Mongolia Agricultural University

A series of carboxymethyl cellulose/organic montmorillonite （CMC/OMMT） nanocomposites with different weight ratios of carboxymethyl cellulose （CMC） to organic montmorillonite （OMMT） were synthesized under different conditions. The nanocomposites were characterized by the Fourier transform infrared （FT-IR） spectrophotometer, X-ray diffraction （XRD） method, transmission electron microscope （TEM）, scanning electron microscope （SEM）, and thermal gravimetric （TG） analysis. The results showed that the introduction of CMC may have different influences on the physico-chemical properties of OMMT and intercalated-exfoliated nanostructures were formed in the nanocomposites. The effects of different reaction conditions on the adsorption capacity of samples for Congo Red （CR） dye were investigated by controlling the amount ofhexadecyl trimethyl ammonium bromide （CTAB）, the weight ratio of CMC to OMMT, the reaction time, and the reaction temperature. Results from the adsorption experiment showed that the adsorption capacity of the nanocomposites can reach 171.37 rag/g, with the amount of CTAB being 1.0 cation exchange capacity （CEC） of MMT, the weight ratio of CMC to OMMT being l：l, the reaction time being 6 h, and the reaction temperature being 60~C. The CMC/OMMT nanocomposite can be used as a potential adsorbent to remove CR dye from an aqueous solution.

关键词： carboxymethyl cellulose organic montmorillonite nanocomposite adsorption,Congo Red dye

Distributed Cooperative Learning for Discrete-Time Strict-Feedback Multi Agent Systems Over Directed Graphs

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IEEE/CAA Journal of Automatica Sinica 2022年第10期9卷 1831-1844页

作者： min wang Haotian Shi Cong wang IEEE the School of Automation Science and Engineering South China University of TechnologyGuangzhou 510641 Peng Cheng Laboratory Shenzhen 518055China the School of Control Science and Engineering Shandong UniversityJinan 250061China the Center for Intelligent Medical Engineering Shandong UniversityJinan 250061China

This paper focuses on the distributed cooperative learning(DCL)problem for a class of discrete-time strict-feedback multi-agent systems under directed *** with the previous DCL works based on undirected graphs,two main challenges lie in that the Laplacian matrix of directed graphs is nonsymmetric,and the derived weight error systems exist n-step *** novel lemmas are developed in this paper to show the exponential convergence for two kinds of linear time-varying(LTV)systems with different phenomena including the nonsymmetric Laplacian matrix and time ***,an adaptive neural network(NN)control scheme is proposed by establishing a directed communication graph along with n-step delays weight updating ***,by using two novel lemmas on the extended exponential convergence of LTV systems,estimated NN weights of all agents are verified to exponentially converge to small neighbourhoods of their common optimal values if directed communication graphs are strongly connected and *** stored NN weights are reused to structure learning controllers for the improved control performance of similar control tasks by the“mod”function and proper time series.A simulation comparison is shown to demonstrate the validity of the proposed DCL method.

关键词： Cooperative learning control directed graphs discrete-time nonlinear system neural networks(NNs) strict-feedback systems

Energy Estimates on Existence of Extremals for Trudinger–Moser Inequalities

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Acta Mathematica Sinica,English Series 2020年第7期36卷 829-841页

作者： Ya min wang School of Mathematics Renmin University of ChinaBeijing 100872P.R.China

LetΩbe a smooth bounded domain in R2,W01,2(Ω)be the standard Sobolev *** the method of energy estimate developed by Malchiodi–Martinazzi(***.,16,893–908(2014)),Mancini–Martinazzi(*** Differential Equations,56,94(2017))and Mancini–Thizy(*** Equations,266,1051–1072(2019)),we reprove the results of Carleson–Chang(***.,110,113–127(1986)),Flucher(***.,67,471–497(1992)),Li(Acta ***.,22,545–550(2006))and Su(***.,in press).Namely,for any real numberα≤1,the supremum■can be achieved by some function v∈W01,2(Ω)with║?v║22≤4π.

关键词： space. Existence 1,2

Singular Supercritical Trudinger-Moser Inequalities and the Existence of Extremals

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Acta Mathematica Sinica,English Series 2020年第8期36卷 873-888页

作者： Xu min wang School of Mathematical Sciences Beijing Normal UniversityBeijing 100875P.R.China

In this paper,we present the singular supercritical Trudinger-Moser inequalities on the unit ball B in Rn,where n≥*** precisely,we show that for any given α>0 and 0 详细信息

In this paper,we present the singular supercritical Trudinger-Moser inequalities on the unit ball B in Rn,where n≥*** precisely,we show that for any given α>0 and 0

关键词： Singular supercritical Trudinger-Moser inequality radial lemma concentration-compactness principle extremal functions

Electrospun multifunctional tissue engineering scaffolds

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Frontiers of Materials Science 2014年第1期8卷 3-19页

作者： Chong wang min wang Department of Mechanical Engineering The University of Hong Kong Pokfulam Road Hong Kong China

Tissue engineering holds great promises in providing successful treat- ments of human body tissue loss that current methods are unable to treat or unable to achieve satisfactory clinical outcomes. In scaffold-based tissue engineering, a high- performance scaffold underpins the success of a tissue engineering strategy and a major direction in the field is to create multifunctional tissue engineering scaffolds for enhanced biological performance and for regenerating complex body tissues. Electrospinning can produce nanofibrous scaffolds that are highly desirable for tissue engineering. The enormous interest in electrospinning and electrospun fibrous structures by the science, engineering and medical communities has led to various developments of the electrospinning technology and wide investigations of eiectrospun products in many industries, including biomedical engineering, over the past two decades. It is now possible to create novel, multicomponent tissue engineering scaffolds with multiple functions. This article provides a concise review of recant advances in the R ＆ D of electrospun multifunctional tissue engineering scaffolds. It also presents our philosophy and research in the designing and fabrication of electrospun multicomponent scaffolds with multiple functions.

关键词： electrospinning monocomponent multicomponent scaffold corHhell drug biomolecule growth factor controlled release

Generalized Virial Theorem for Mixed State When Hamiltonians Include Coordinate-Momentum Couplings

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Communications in Theoretical Physics 2008年第5期49卷 1173-1176页

作者： wang min Department of Material Science and Engineering University of Science and Technology of China Hefei 230026 China

The generalized Virial theorem for mixed state, derived from the generalized Hellmann Feynman theorem, only applies to Hamiltonians in which potential of coordinates is separate from momentum energy term. In this paper we discuss Virial theorem for mixed state for some Hamiltonians with coordinate-momentum couplings in order to know their contributions to internal energy.

关键词： generalized Virial theorem mixed state

Effective removal of phosphorus from high phosphorus steel slag using carbonized rice husk

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Journal of Environmental Sciences 2023年第2期124卷 156-164页

作者： Zhongliang wang Yanping Bao Dazhi wang min wang State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

High phosphorus steel slag and carbonized rice husk are two common wastes characterized by high generation and low secondary use *** the reduction of high phosphorus steel slag by biomass,both wastes were fully utilized,thus reducing the negative impact on the *** this study,variables such as temperature,time,and amount of reactants were changed to determine the optimal conditions for the reaction of steel slag with carbonized rice husk at high *** actual amount of reducing agent consumed during the reduction was significantly greater than that predicted by theoretical *** three carbon equivalent of carbonized rice husk and maintaining at 1500℃ for 30 min could remove 79.25% of P_(2)O_(5) in the *** modeling the material cycle in which high phosphorus steel slag was treated with biomass,the product could be used for crop ***,the reduced iron and residual steel slag can be used tomake steel again,thereby leading to a sharp reduction in fossil fuel usage and greenhouse gas emissions in this process.

关键词： High phosphorus steel slag Carbonized rice husk Reduction dephosphorization Material cycle

Recent advances on dynamic learning from adaptive NN control

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Control Theory and Technology 2020年第1期18卷 107-109页

作者： min wang Cong wang School of Automation Science and Engineering South China University of TechnologyGuangzhou Guangdong 510641China

Notice that intelligent control is developed based on the learning and control abilities of human *** such,an ideal intelligent control system should not only have the ability to adapt to complex dynamic environments,but also the ability to imitate human *** learning ability means to acquire the knowledge of uncertain closed-loop dynamics from dynamic environments,and use the stored experience knowledge to improve control performance[1,2].Such an autonomous learning has been viewed as one of the most important and indispensable capabilities to achieve a high degree of system autonomy.

关键词： knowledge dynamic environments

Explicit Expression of Foldy-Wouthuysen Transformation

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Chinese Physics Letters 1998年第4期15卷 235-237页

作者： wang An-min Chinese Center of Advanced Science and Technology(World Laboratory) P.O.Box 8730Beijing 100080 Department of Modern Physics University of Science and Technology of ChinaHefei 230027

The general,explicit and formally closed expression of arbitrary n-times Foldy-Wouthuysen transformations is clearly and strictly derived *** is proved that if transformed Hamiltonian needs to be approximated to the order 1/m^(K) or mv^(2K) when to involve the orders of the operators,then to make N=[(K+1)/2]-times Foldy-Wouthuysen transformations is just enough(“[...]”means to take the part of integer).An example in non-relativistic quantum chromodynamics is given.

关键词： Transformation integer operators