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Simultaneous generation of electricity, ethylene and decomposition of nitrous oxide via protonic ceramic fuel cell membrane reactor

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Journal of Energy Chemistry 2023年第2期77卷 359-368,I0010页

作者： Song Lei Ao Wang guowei weng Ying Wu Jian Xue Haihui Wang Guangdong Provincial Key Lab of Green Chemical Product Technology School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou 510640GuangdongChina Beijing Key Laboratory for Membrane Materials and Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China School of Chemical Engineering and Light Industry Guangdong University of TechnologyGuangzhou 510006GuangdongChina

Ethylene,one of the most widely produced building blocks in the petrochemical industry,has received intense *** production,using electrochemical hydrogen pump-facilitated nonoxidative dehydrogenation of ethane(NDE)to ethylene,is an emerging and promising route,promoting the transformation of the ethylene industry from energy-intensive steam cracking process to new electrochemical membrane reactor *** this work,the NDE reaction is incorporated into a BaZr_(0.1)Ce_(0.7)Y_(0.1)Yb_(0.1)O_(3-δ)electrolyte-supported protonic ceramic fuel cell membrane reactor to co-generate electricity and ethylene,utilizing the Nb and Cu doped perovskite oxide Pr_(0.6)Sr_(0.4)Fe_(0.8)Nb_(0.1)Cu_(0.1)O_(3-δ)(PSFNCu)as anode catalytic *** to the doping of Nb and Cu,PSFNCu was endowed with high reduction tolerance and rich oxygen vacancies,showing excellent NDE catalytic *** maximum power density of the assembled reactor reaches 200 mW cm^(-2)at 750℃,with high ethane conversion(44.9%)and ethylene selectivity(92.7%).Moreover,the nitrous oxide decomposition was first coupled in the protonic ceramic fuel cell membrane reactor to consume the permeated *** a result,the generation of electricity,ethylene and decomposition of nitrous oxide can be simultaneously obtained by a single ***,the maximum power density of the cell reaches 208 mW cm^(-2)at 750℃,with high ethane conversion(45.2%),ethylene selectivity(92.5%),and nitrous oxide conversion(19,0%).This multi-win technology is promising for not only the production of chemicals and energy but also greenhouse gas reduction.

关键词： Nonoxidative dehydrogenation of ethane Ethylene Nitrous oxide decomposition Protonic ceramic fuel cell membrane reactor Perovskite oxide

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Enhanced Adhesion of Mussel-inspired Adhesive through Manipulating Contents of Dopamine Methacrylamide and Molecular Weight of Polymer

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Journal of Bionic Engineering 2018年第3期15卷 461-470页

作者： Xiong Xiong Yumei Liu Feng Shi guowei Zhang Jie weng Shuxin Qu Key Lab of Advanced Technologies of Materials Ministry of Education School of Materials Science and Engineering Southwest Jiaotong University Chengdu 610031 China School of Life Science and Engineering Southwest Jiaotong University Chengdu 610031 China College of Environmental Science and Engineering China West Normal University Nanchong 637009 China Collaboration Innovation Center for Tissue Repair Material Engineering Technology China West Normal University Nanehong 637009 China

The aim of this study is to investigate the effect of the contents of modified 3, 4-dihydroxyphenyl-L-alanine （DOPA）, named as do- pamine methacrylamide （DMA）, on the adhesion of mussel-inspired adhesives in air and water. A series of adhesives, p（DMA-co-MEA）, were synthesized by copolymerized DMA and methoxy ethylacrylate （MEA） with the content of DMA from 2 mol.% to 10 mol.%. Results of IH NMR show that the contents of DMA in all adhesives are near to the theory ratios of DMA in the staring reagents. Adhesives with more than 5 mol.% of DMA appear adhesion, while adhesives with 2 mol. % and 3 mol. % of DMA show almost no adhesion in air and water. Adhesive with 7 mol.% of DMA has the highest molecular weight and adhesion either in air or in water in all adhesives. Adhesion of adhesive is synergistically influenced by the content of DMA, molecular weight and elastic modulus of adhesive. It is because that higher content of DMA would provide more DOPA, which leads to the coordination bond between DOPA and metal ions. It is feasible to develop the mussel-inspired adhesive through incorporating DMA into polymers, which will have potential application in the clinic.

关键词： mussel-inspired adhesive adhesion dopamine methacrylamide

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氮掺杂ZnO四足体的制备及其光催化性能研究

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东莞理工学院学报 2016年第5期23卷 63-66页

作者：李尧谢宗贤陈海鑫曾琪李圣龙翁国伟邱永福东莞理工学院生态环境与建筑工程学院广东东莞523808

首次制备了氮掺杂的ZnO四足体,并采用SEM和XPS对其结构进行了表征。我们首次采用紫外-可见光分光光度计来测定氮掺杂的ZnO四足体的带隙,结果表明氮掺杂后ZnO四足体的带隙明显变窄,这归因于杂质氮2p轨道远远高于ZnO价带的最大值,带隙明... 详细信息

首次制备了氮掺杂的ZnO四足体,并采用SEM和XPS对其结构进行了表征。我们首次采用紫外-可见光分光光度计来测定氮掺杂的ZnO四足体的带隙,结果表明氮掺杂后ZnO四足体的带隙明显变窄,这归因于杂质氮2p轨道远远高于ZnO价带的最大值,带隙明显变窄提高了Arrhenius方程中的速率常数k值。也就是说,氮掺杂使带隙变窄,导致ZnO四足体的光催化活性提高。

关键词：纳米材料半导体 ZnO 带隙

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Polymers with complicated architectures constructed from the versatile, functional monomer 1-ethoxyethyl glycidyl ether

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Science China Chemistry 2015年第11期58卷 1674-1694页

作者： Jiaxing Zhang guowei Wang State Key Laboratory of Molecular Engineering of Polymers Collaborative Innovation Center of Polymers and Polymer Composite Materials Department of Macromolecular Science Fudan University

Because glycidyl(Gly) contains an epoxy and an active hydroxyl group, the Gly unit is difficult to introduce into certain polymeric chains in a controlled manner and usually yields hyperbranched polyglycidyl. Alternatively, the monomer 1-ethoxyethyl glycidyl ether(EEGE), derived from Gly and ethyl vinyl ether, has shown potential for application in polymer chemistry, and homopolymerization of this monomer directly produces linear poly(1-ethoxyethyl glycidyl ether) and further yields linear polyglycidyl. In this review, the initiation system of the EEGE monomer is first discussed in terms of chain transfer to monomers in ring-opening polymerization of epoxides with substituent groups. Then, random copolymerization of EEGE with other epoxides is considered. In addition, because the EEGE units on polymers can be transferred to Gly units and further used to construct copolymers with complicated architectures, the applications of EEGE monomers to block, graft, and hyperbranched copolymers are reviewed. Finally, the synthesis of main chain and terminal functional polyethers by transforming the hydroxyl groups at the polymer end or on the main chain into certain functional groups are also discussed. Chemistry based on EEGE has been proved to be an efficient, versatile route to constructing copolymers containing Gly units and ultimately yielding the target properties and applications.

关键词： linear polyglycidyl (LPG) poly(1-ethoxyethyl glycidyl ether) (PEEGE) block polymer graft polymer hyper-branched polymer

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3D simulation of image-defined complex internal features using the numerical manifold method

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Science China(Technological Sciences) 2024年第4期67卷 1023-1039页

作者： WU Jie MA guowei School of Civil and Transportation Engineering Hebei University of TechnologyTianjin 300401China Tianjin Key Laboratory for Prefabricated Building and Intelligent Construction Tianjin 300401China

The numerical simulation of internal features,such as inclusions and voids,is important to analyze their impact on the performance of composite ***,the complex geometries of internal features and the induced continuous-discontinuous(C-D)deformation fields are challenges to their numerical *** this study,a 3D approach using a simple mesh to simulate irregular internal geometries is developed for the first *** the help of a developed voxel crack model,image models that are efficient when recording complex geometries are directly imported into the *** reconstructions,which are usually labor-intensive,are excluded from this ***,using image models as the geometric input,image processing techniques are applied to detect material interfaces and develop contact ***,the C-D deformations of the complex internal features are directly calculated based on the numerical manifold *** accuracy and convergence of the developed3D approach are examined based on multiple *** 3D C-D simulation of sandstones with naturally formed complex microfeatures demonstrates the capability of the developed approach.

关键词： 3D continuous-discontinuous simulation image-based simulation complex internal features numerical manifold method voxel crack model structured mesh

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VALUE-ADDED SERVICE INVESTING AND PRICING STRATEGIES FOR A TWO-SIDED PLATFORM UNDER INVESTING RESOURCE CONSTRAINT

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Journal of Systems Science and Systems Engineering 2017年第5期26卷 609-627页

作者： guowei Dou Ping He Research Institute of Business Analytics and Supply Chain Management Postdoctoral Station of Theoretical Economics School of Management Shenzhen University Shenzhen Guangdong 518060 PR China School of Management Zhejiang University Hangzhou Zhejiang 310058 PR China

Investing on value-added service （VAS） amplifies users＇ participation and platform profit. However, the investing resource is usually limited in practice. This paper investigates VAS investing and pricing strategies for a two-sided platform under investing resource constraint. We reveal that with VAS investment, Subsidizing can still be done to enlarge users＇ demand, even when the investing cost becomes higher. For optimal pricing strategies, the network effect will be the dominating determinant if the gap between two marginal cross-side benefits （i.e. the benefit that users obtain when each new user join the other side of the platform） is large. Interestingly, we show that with the increase of the marginal investing cost, users might either be priced higher or lower. If the marginal investing cost increases to a high level, and the gap between the two marginal cross-side benefits is large, lowering the access fee for users possessing the higher eross-side network effect does not necessarily compensate more profit loss caused by higher cost. Moreover, after VAS is developed, raising the access fee for those whose marginal investing benefit is large does not necessarily generate more profit as well. The opposite strategy further enlarges users＇ utility, and promotes the investment to benefit more users.

关键词： Network effect optimization two-sided market value-added service investment investingresource constraint

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A critical review of preparation design and workability measurement of concrete material for largescale 3D printing

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Frontiers of Structural and Civil Engineering 2018年第3期12卷 382-400页

作者： guowei MA Li WANG College of Architecture and Civil Engineering Beijing University of Technology Beijing 100124 China School of Civil Environmental and Mining Engineering The University of Western Australia Crawley WA 6009 Australia School of Mechanics and Civil engineering China University of Mining & Technology at Beijing Beijing 100083 China

In recent few years, significant improvement has been made in developing largescale 3D printers to accommodate the need of industrial-scale 3D printing. It is of great feasibility to construct structural components and buildings by means of 3D concrete printing. The major issues of this innovative technique focus on the preparation and optimization of concrete materials which possess favourable printable properties as well as the measurement and evaluation methods of their workability. This paper firstly introduces three largescale 3D printing systems that have been successfully applied in construction industry. It then summarizes the commonly used raw materials in concrete manufacturing. Critical factors that should be particularly controlled in material preparation are specified. Easy-extrusive, easy-flowing, well-buildable, proper setting time and low shrinkage are significant for concrete mixture to meet the critical requirements of a freeform construction process. Thereafter, measuring methods that can be employed to assess the fresh and hardened properties of concrete at early stages are suggested. Finally, a few of evaluation methods are presented which may offer certain assistance for optimizing material preparation. The objective of this work is to review current design methodologies and experimental measurement and evaluation methods for 3D printable concrete materials and promote its responsible use with largescale 3D printing technology.

关键词： 3D printing concrete material printable property workability measurement construction automation

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Scaling of energy spectra in weakly compressible turbulence

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Acta Mechanica Sinica 2017年第3期33卷 500-507页

作者： Yufeng Dong guowei He The State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences School of Engineering Sciences University of Chinese Academy of Sciences

We find an asymptotic expression for the characteristic timescales of decorrelation processes in weakly compressible and isothermal turbulence. This result is used in the Eddy-Damped Quasi-Normal Markovian equation to derive the scalings of compressible energy spectra: (1) if the acoustic waves are dominant, the compressible energy spectra exhibit \(-7/3\) scaling; (2) if local eddy straining is dominant, the compressible energy spectra are scaled as \(-3\). Meanwhile, the energy spectra of incompressible components display the same scaling of \(-5/3\) as those in incompressible turbulence. The direct numerical simulations of weakly compressible turbulence are used to examine the scaling.

关键词： Compressible turbulence Energy spectra Two-point closure Space-time correlation

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Supercritical branching Brownian motion with catalytic branching at the origin

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Science China Mathematics 2020年第3期63卷 595-616页

作者： Li Wang guowei Zong School of Sciences Beijing University of Chemical TechnologyBeijing 100029China School of Public Health Tianjin Medical UniversityTianjin 300070China

We consider a catalytic branching Brownian motion with general branching which takes place only when particles are at the origin at a rate β>0 on the local time scale. We first establish a spine decomposition for the case wherein the particles have a positive probability of having no children. Then using this tool, we obtain results regarding the asymptotic behavior of the number of particles above λt at time t for λ>0. Under an L log L condition, we prove a strong law of large numbers for this catalytic branching Brownian motion.

关键词： catalytic branching Brownian motion L log L

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Multi-Scale-Matching neural networks for thin plate bending problem

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Theoretical & Applied Mechanics Letters 2024年第1期14卷 11-15页

作者： Lei Zhang guowei He The State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China

Physics-informed neural networks are a useful machine learning method for solving differential equations,but encounter challenges in effectively learning thin boundary layers within singular perturbation *** resolve this issue,multi-scale-matching neural networks are proposed to solve the singular perturbation *** by matched asymptotic expansions,the solution is decomposed into inner solutions for small scales and outer solutions for large scales,corresponding to boundary layers and outer regions,***,to conform neural networks,we introduce exponential stretched variables in the boundary layers to avoid semiinfinite region *** results for the thin plate problem validate the proposed method.

关键词： Singular perturbation Physics-informed neural networks Boundary layer Machine learning

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