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Controllable fabrication and multifunctional applications of graphene/ceramic composites

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Journal of Advanced Ceramics 2020年第3期9卷 271-291页

作者： Yujia HUANG Chunlei wan State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Graphene with excellent comprehensive properties has been considered as a promising filler to reinforce *** numerous studies have been devoted to the improvement of mechanical and electrical properties,incorporating graphene to ceramics also offers new opportunities for endowing ceramics with *** this review,the recent development of graphene/ceramic bulk composites is summarized with the focus on the construction of well-designed architecture and the realization of multifunctional *** processing technologies of the composites are systematically summarized towards homogeneous dispersion and even ordered orientation of graphene sheets in the ceramic *** improvement of composites in mechanical,electrical,electromagnetic,and thermal performances is *** novel multifunctional applications brought by smart integration of graphene in ceramics are also addressed,including microwave absorption,electromagnetic interference shielding,ballistic armors,self-monitor damage sensors,and energy storage and conversion.

关键词： graphene/ceramic composites synthesis mechanical property electromagnetic properties thermal properties multifunction

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基于离合式承压箱的复合地基静载荷检测技术

科学技术创新 2025年第2期 209-212页

作者：万业强湖南经研电力设计有限公司湖南长沙

本文主要介绍了一种基于离合式承压箱的复合地基静载荷检测技术。以某厂房的水泥搅拌桩加固软土地基工程为例,随机选取20根柱分别使用常规承压板和离合式承压箱进行了复合地基静载荷检测,同时使用ABAQUS软件构建复合地基模型进行了数值... 详细信息

本文主要介绍了一种基于离合式承压箱的复合地基静载荷检测技术。以某厂房的水泥搅拌桩加固软土地基工程为例,随机选取20根柱分别使用常规承压板和离合式承压箱进行了复合地基静载荷检测,同时使用ABAQUS软件构建复合地基模型进行了数值模拟。采用分级加荷的方式,分别测定不同荷载下的复合地基沉降量。结果表明,基于离合式承压箱的检测结果更接近数值模拟结果,说明该检测技术具有更高的精确性。在桩土应力比方面,基于离合式承压箱的复合地基桩土应力比曲线中,桩土应力比与荷载的线性关系更好。综上,基于离合式承压箱的复合地基静载荷检测技术具有节约时间、精度更高的优势。

关键词：离合式承压箱承压板复合地基静载荷检测

Sequestration of toxic Pb(Ⅱ) ions by chemically treated rubber(Hevea brasiliensis) leaf powder

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Journal of Environmental Sciences 2010年第2期22卷 248-256页

作者： Megat Hanafiah Megat Ahmad Kamal wan Mat Khalir wan Khaima Azira Mohamed Kasmawati Zakaria Haslizaidi wan Ngah wan Saime Faculty of Applied Sciences Universiti Teknologi MARA Pahang26400 JengkaPahangMalaysia Faculty of Applied Sciences Universiti Teknologi MARA40450 Shah AlamSelangorMalaysia School of Chemical Sciences Universiti Sains Malaysia11800 MindenPenangMalaysia

Rubber leaf powder （an agricultural waste） was treated with potassium permanganate followed by sodium carbonate and its performance in the removal of Pb（II） ions from aqueous solution was evaluated. The interactions between Pb（II） ions and functional groups on the adsorbent surface were confirmed by Fourier transform infrared （FT-IR） spectroscopy, scanning electron microscopy （SEM） coupled with X-ray energy dispersive spectroscopy （EDX）. The effects of several important parameters which can affect adsorption capacity such as pH, adsorbent dosage, initial lead concentration and contact time were studied. The optimum pH range for lead adsorption was 4-5. Even at very low adsorbent dosage of 0.02 g, almost 100% of Pb（II） ions （23 mg/L） could be removed. The adsorption capacity was also dependent on lead concentration and contact time, and relatively a short period of time （60-90 min） was required to reach equilibrium. The equilibrium data were analyzed with Langmuir, Freundlich and Dubinin-Radushkevich isotherms. Based on Langmuir model, the maximum adsorption capacity of lead was 95.3 mg/g. Three kinetic models including pseudo first-order, pseudo second-order and Boyd were used to analyze the lead adsorption process, and the results showed that the pseudo second-order fitted well with correlation coefficients greater than 0.99.

关键词： adsorption isotherm kinetics lead rubber leaf powder

Theoretical study on dynamic effective electroelastic properties of random piezoelectric composites with aligned inhomogeneities

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Applied Mathematics and Mechanics(English Edition) 2023年第4期44卷 525-546页

作者： Yanpeng YUE Yongping wan School of Aerospace Engineering and Applied Mechanics Tongji UniversityShanghai 200092China

The closed-form solutions of the dynamic problem of heterogeneous piezoelectric materials are formulated by introducing polarizations into a reference medium and using the generalized reciprocity *** solutions can be reduced to the ones of an elastodynamic *** on the effective medium method,these closedform solutions can be used to establish the self-consistent equations about the frequencydependent effective parameters,which can be numerically solved by *** predictions are compared with the experimental results,and good agreement can be ***,the analyses on the effects of microstructure and wavelength on the effective properties,resonance frequencies,and attenuation are also presented,which may provide some guidance for the microstructure design and analysis of piezoelectric composites.

关键词： piezoelectric composite dynamic effective property self-consistent method resonance frequency wavelength

Numerical simulation of local and global mixing/segregation characteristics in a gas–solid fluidized bed

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Chinese Journal of Chemical Engineering 2022年第4期35卷 72-86页

作者： Zhen wan Youjun Lu State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an 710049China

Researches on solids mixing and segregation are of great significance for the operation and design of fluidized bed *** this paper,the local and global mixing and segregation characteristics of binary mixtures were investigated in a gas–solid fluidized bed by computational fluid dynamics-discrete element method(CFD-DEM)coupled approach.A methodology based on solids mixing entropy was developed to quantitatively calculate the mixing degree and time of the *** mixing curves of global mixing entropy were acquired,and the distribution maps of local mixing entropy and mixing time were also *** comparing different operating conditions,the effects of superficial gas velocity,particle density ratio and size ratio on mixing/segregation behavior were *** showed that for the partial mixing state,the fluidized bed can be divided into three parts along the bed height:complete segregation area,transition area and stable mixing *** areas showed different mixing/segregation *** gas velocity promoted the local and global mixing of binary *** increase in particle density ratio and size ratio enlarged the complete segregation area,reduced the mixing degree and increased the mixing time in the stable mixing area.

关键词： Discrete element method Solids mixing Binary mixtures Fluidized bed

A PROXIMAL POINT ALGORITHM FOR A SYSTEM OF GENERALIZED MIXED VARIATIONAL INEQUALITIES

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Journal of Systems Science & Complexity 2012年第5期25卷 964-972页

作者： Bo wan Xuegang ZHAN Department of Mathematics and Statistics Chongqing Technology and Business University School of Accountancy Chongqing Technology and Business University

This paper introduces and considers a new system of generalized mixed variational inequal- ities in a Hilbert space, which includes many new and known systems of variational inequalities and generalized variational inequalities as special cases. By using the two concepts of η-subdifferential and η-proximal mappings of a proper function, the authors try to demonstrate that the system of generalized mixed variational inequalities is equivalence with a fixed point problem. By applying the equivalence, a new and innovative η-proximal point algorithm for finding approximate solutions of the system of generalized mixed variational inequalities will be suggested and analyzed. The authors also study the convergence analysis of the new iterative method under much weaker conditions. The results can be viewed as a refinement and improvement of the previously known results for variational inequalities.

关键词： Lipschitz continuity proximal point algorithms relaxed (γ τ)-cocoercivity system ofgeneralized mixed variational inequalities.

Catalytic methanation reaction over supported nickel-rhodium oxide for purification of simulated natural gas

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Journal of Natural Gas Chemistry 2011年第6期20卷 585-594页

作者： wan Azelee wan Abu Bakar Rusmidah Ali Susilawati Toemen Department of Chemistry Faculty of ScienceUniversiti Teknologi Malaysia

In this research,new catalyst with high industrial impact is developed,which can catalyze the conversion of CO2 to methane through methanation reaction.A series of catalysts based on nickel oxide were prepared using wetness impregnation technique and ageing,followed by calcination at 400℃.Rh/Ni（30：70）/Al2O3 catalyst was revealed as the most potential catalyst based on the results of catalytic activity measurement monitored by Fourier Transform Infrared Spectroscopy（FTIR）and Gas Chromatography（GC）.The results showed 90.1%CO2 conversion and 70.8% yield at 400℃.

关键词： noble metal nickel oxide catalyst carbon dioxide methanation

Chitosan and chemically modified chitosan beads for acid dyes sorption

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Journal of Environmental Sciences 2009年第3期21卷 296-302页

作者： AZLAN Kamari wan SAIME wan Ngah LAI KEN Liew Department of Chemistry Faculty of Science and Technology Universiti Pendidikan Sultan Idris School of Chemical Sciences Universiti Sains Malaysia

The capabilities of chitosan and chitosan-EGDE （ethylene glycol diglycidyl ether） beads for removing Acid Red 37 （AR 37） and Acid Blue 25 （AB 25） from aqueous solution were examined. Chitosan beads were cross-linked with EGDE to enhance its chemical resistance and mechanical strength. Experiments were performed as a function ofpH, agitation period and concentration of AR 37 and AB 25. It was shown that the adsorption capacities of chitosan for both acid dyes were comparatively higher than those of chitosan- EGDE. This is mainly because cross-linking using EGDE reduces the major adsorption sites -NH3＋ on chitosan. Langmuir isotherm model showed the best conformity compared to Freundlich and BET. The kinetic experimental data agreed very well to the pseudo second-order kinetic model. The desorption study revealed that after three cycles of adsorption and desorption by NaOH and HCl, both adsorbents retained their promising adsorption abilities. FT-IR analysis proved that the adsorption of acid dyes onto chitosan-based adsorbents was a physical adsorption. Results also showed that chitosan and chitosan-EGDE beads were favourable adsorbers and could be employed as low-cost alternatives for the removal of acid dyes in wastewater treatment.

关键词： cross-linking acid dyes adsorption capacities adsorption rates adsorption isotherm desorption

2021 Emerging Investigator Issue of Science China Chemistry

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Science China Chemistry 2021年第11期64卷 1811-1816页

作者： Li-Jun wan Institute of Chemistry Chinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China

In 2020,*** Chem.(SCC)published an"Emerging Investigator Issue,"featuring the works conducted by young scientists at an early stage of their independent research *** research finding in this issue has showcased the excitement and potential of a new-generation of scientists in pushing forward the development of chemistry and related fields,and has been well-received for its academic value and novel perspective.

关键词： finding Issue featuring