检索结果-南通市图书馆

Analysis of the penalty version of the Arlequin framework for the prediction of structural responses with large deformations

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第7期12卷 552-560页

作者： Hua qiao wei-qiu CHEN Department of Engineering Mechanics Zhejiang University Hangzhou 310027 China

The Arlequin framework proposed by Ben Dhia in 1998 is a flexible and robust method for conducting global/local analysis of structures and materials.A penalty version of the Arlequin framework for the study of structural problems involving large deformation is considered *** implementation of the penalty-based Arlequin framework into ABAQUS is then explored and the corresponding Arlequin user element subroutine is *** nonlinear simulations of a cantilever beam and a shallow arch are conducted and the choice of the coupling operator with an appropriate penalty parameter is *** numerical results justify the feasibility of the proposed method,ensuring its further application to more complicated problems involving geometric or material nonlinearities.

关键词： Global/Local analysis Geometric nonlinear analysis Penalty-based Arlequin method User defined element

Self-organized Criticality Behavior in Bulk Metallic Glasses

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2016年第1期23卷 7-13页

作者： Jun-wei qiao Zhong WANG Laboratory of Applied Physics and Mechanics of Advanced Materials College of Materials Science and EngineeringTaiyuan University of Technology

Serrated flows are known as repeated yielding of bulk metallic glasses（BMGs）during plastic deformation under different loading conditions,which are associated with the operation of shear *** to the statistics of some parameters,the shear avalanches can display a self-organized critical state,suggesting a large ductility of *** emergence of the self-organized criticality（SOC）behavior in different BMGs is due to the temperature,strain rate,and chemical *** SOC behavior is accompanied with the following phenomena：the interactions occur in the shear bands;the incubation time is longer than the relaxation time;the time interval is lacking of typical time scale;and the spatial or temporal parameters should display apower-law distribution.

关键词： self-organized criticality behavior bulk metallic glass serrated flow power-law distribution

All-optically integrated photoacoustic and optical coherence tomography:A review

在线全文

学校读者我要写书评

暂无评论

Journal of Innovative Optical Health Sciences 2017年第4期10卷 42-51页

作者： wei qiao Zhongjiang Chen Ministry of Education Key Laboratory of Laser Life Science and Institute of Laser Life Science College of Biophotonics South China Normal University Guangzhou 510631 China

All-optically integrated photoacoustic(PA)and optical coherence tomography(OCT)dualmode imaging technology that could o®er comprehensive pathological information for accurate diagnosis in clinic has gradually become a promising imaging technology in the aspect of biomedical imaging during the recent *** review refers to the technology aspects of alloptical PA detection and system evolution of optically integrated PA and OCT,including Michelson interferometer dual-mode imaging system,Fabry–Perot(FP)interferometer dualmode imaging system and Mach–Zehnder interferometer dual-mode imaging *** is believed that the optically integrated PA and OCT has great potential applications in biomedical imaging.

关键词： All-optical photoacoustic optical coherence tomography dual-mode imaging

Possible solutions for sludge dewatering in China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2010年第1期4卷 102-107页

作者： wei WANG Yuxiang LUO wei qiao Department of Environmental Science and Engineering Tsinghua UniversityBeijing 100084China College of Chemical Engineering China University of PetroleumBeijing 102249China

In China,over 1.43×10^(7)tons of dewatered sewage sludge,with 80%water content,were generated from wastewater treatment plants in *** 60%of the COD removed during the wastewater treatment process becomes concentrated as *** disposal methods used by municipal solid waste treatment facilities,such as landfills,composting,or incineration,are unsuitable for sludge disposal because of its high water *** of sludge has therefore become a major focus of current environmental protection *** present status of sludge treatment and disposal methodology is introduced in this *** the energy consumption of sludge dewatering from 80%to 50%has been a key issue for safe and economic sludge *** an analysis of sludge water distribution,thermal drying and hydrothermal conditioning processes are *** thermal drying could result in an almost dry sludge,the energy consumption needed for this process is extremely *** comparison,hydrothermal technology could achieve dewatered sewage sludge with a 50%–60%water content,which is suitable for composting,incineration,or *** energy consumption of hydrothermal technology is lower than that required for thermal drying.

关键词： sewage sludge disposal water content thermal drying hydrothermal conditioning

Optimal Price-maker Trading Strategy of Wind Power Producer Using Virtual Bidding

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2022年第3期10卷 766-778页

作者： Dongliang Xiao Mohamed Kareem AlAshery wei qiao IEEE Power and Energy Systems Laboratory Department of Electrical and Computer EngineeringUniversity of Nebraska-LincolnLincolnNE 68588-0511USA School of Electric Power South China University of TechnologyGuangzhou 510641China

This paper proposes a stochastic optimization model for generating the optimal price-maker trading strategy for a wind power producer using virtual bidding,which is a kind of financial tool available in most electricity markets of the United *** the proposed model,virtual bidding is used to improve the wind power producer’s market power in the dayahead(DA)market by trading at multiple buses,which are not limited to the locations of the wind *** optimal joint wind power and virtual trading strategy is generated by solving a bi-level nonlinear stochastic optimization *** upperlevel problem maximizes the total expected profit of the wind power and virtual bidding while using the conditional value at risk(CVa R)for risk *** lower-level problem represents the clearing process of the DA *** using the Karush-Kuhn-Tucker(KKT)conditions,duality theory,and big-M method,the bi-level nonlinear stochastic model is firstly transferred into an equivalent single-level stochastic mathematical program with the equilibrium constraints(MPEC)model and then a mixed-integer linear programming(MILP)model,which can be solved by existing commercial *** reduce the computational cost of solving the proposed stochastic optimization model for large systems,a method of reducing the number of buses considered for virtual bidding is proposed to simplify the stochastic MPEC model by reducing its decision variables and constraints related to virtual *** studies are performed to show the effectiveness of the proposed model and the method of reducing the number of buses considered for virtual *** impacts of the transmission limits,wind unit location,risk aversion parameters,wind power volatility,and wind and virtual capacities on the price-maker trading strategy are also studied through case studies.

关键词： Bi-level optimization electricity market risk management stochastic optimization virtual bidding wind power

Advances of PtRu-Based Electrocatalysts for Methanol Oxidation

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2022年第7期41卷 16-34页

作者： wei qiao Xingyu Huang Ligang Feng School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002China

Platinum-Ruthenium(PtRu)-based materials are considered the “holy grail” of electrocatalysts for methanol oxidation reaction(MOR) in the fuel cells technique. However,to the best of our knowledge, the exhaustive review report on the advance of PtRu materials for methanol oxidation is rarely summarized for the recent novel achievements. Herein,we summarize and discuss the latest progress of PtRu-based catalysts in MOR. The reaction mechanism of MOR is firstly introduced, and the promotion mechanism is revealed by the relevant activity descriptor, the in-situ spectroscopic analysis and the theoretical calculation. Subsequently, some advanced regulation strategies of PtRu-based catalysts are concluded, including support engineering, morphology design and surface interface regulation. Finally, the challenges and opportunities to improve the MOR performance of PtRubased electrocatalysts are prospected to further promote the widespread application of PtRu-based catalysts in electrocatalytic systems. It is concluded that many efforts are still required to decipher the atomic scale structure-activity relationship and the structural changes of atoms and electrons in the reaction process by advanced strategies and characterization methods. Hopefully, this review can be helpful for novel PtRu-based catalyst development and understanding their correlation to the structure and performance of energy-relevant electrocatalysis.

关键词： Pt-Ru based catalysts electrocatalysis methanol oxidation reaction regulation strategies

Prognostic Condition Monitoring for Wind Turbine Drivetrains via Generator Current Analysis

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Electrical Engineering 2018年第3期4卷 80-89页

作者： wei qiao Liyan Qu Power and Energy Systems Laboratory Department of Electrical and Computer EngineeringUniversity of Nebraska-LincolnLincolnNE 68588-0511USA

Maintenance costs account for a significant portion of the total cost of electricity generated by wind *** in the wind power industry,maintenance is mainly performed on regular schedules or when significant damage occurs in a wind turbine making it inoperable,instead of being determined by the actual condition of the wind *** the total maintenance costs,approximately 25%~35%is related to regularly scheduled preventive maintenance and 65%~75%to unscheduled corrective *** reduce the failure rate and level and maintenance costs and improve the availability,reliability,safety,and lifespans of wind turbines,it is desirable to perform condition-based predictive maintenance for wind turbines,which will require a high-fidelity online prognostic condition monitoring system(CMS)for fault diagnosis and prognosis and remaining useful life(RUL)prediction of wind *** of the existing wind turbine CMSs are based on vibration monitoring and have no or limited capability in fault prognosis and RUL *** to vibration monitoring,the prognostic condition monitoring techniques based on generator current signal analysis proposed recently have significant advantages in terms of cost,hardware complexity,implementation,and *** paper discusses the principles and challenges of using generator current signals for prognostic condition monitoring of wind turbine drivetrains and presents an overview of recent advancements in this area.

关键词： Current signal drivetrain fault diagnosis fault prognosis prediction prognostic condition monitoring remaining useful life(RUL) wind turbine

Anaerobic co-digestion of municipal biomass wastes and waste activated sludge: Dynamic model and material balances

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2013年第10期25卷 2112-2122页

作者： Yifei Sun Dian Wang wei qiao wei Wang Tianle Zhu School of Chemistry and Environment Beihang University College of Chemical Science and Engineering China University of Petroleum School of Environment Tsinghua University

The organic matter degradation process during anaerobic co-digestion of municipal biomass waste （MBW） and waste-activated sludge （WAS） under different organic loading rates （OLRs） was investigated in bench-scale and pilot-scale semi-continuous stirred tank reactors. To better understand the degradation process of MBW and WAS co-digestion and provide theoretical guidance for engineering application, anaerobic digestion model No. 1 was revised for the co-digestion of MBW and WAS. The results showed that the degradation of organic matter could be characterized into three different fractions, including readily hydrolyzable organics, easily degradable particulate organics, and recalcitrant particle organics. Hydrolysis was the rate-limiting step under lower OLRs, and methanogenesisis was the rate-limiting step for an OLR of 8.0 kg volatile solid （VS）/（m^3·day）. The hydrolytic parameters of carbohydrate, protein, and lipids were 0.104, 0.083, and 0.084 kg chemical oxygen demand （COD）/（kg COD·hr）, respectively, and the reaction rate parameters of lipid fermentation were 1 and 1.25 kg COD/（kg ***） for OLRs of 4.0 and 6.0 kg VS/（m^3·day）. A revised model was used to simulate methane yield, and the results fit well with the experimental data. Material balance data were acquired based on the revised model, which showed that 58.50% of total COD was converted to methane.

关键词： anaerobic digestion material balances kinetic parameters modelling municipal biomass waste

Electrochemical hydrogen evolution efficiently boosted by interfacial charge redistribution in Ru/MoSe_(2) embedded mesoporous hollow carbon spheres

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2023年第10期85卷 447-454,I0012页

作者： Yubin Kuang wei qiao Fulin Yang Ligang Feng School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002JiangsuChina

The strong metal-support interaction inducing combined effect plays a crucial role in the catalysis reaction. Herein, we revealed that the combined advantages of MoSe_(2), Ru, and hollow carbon spheres in the form of Ru nanoparticles(NPs) anchored on a two-dimensionally ordered MoSe_(2) nanosheet-embedded mesoporous hollow carbon spheres surface(Ru/MoSe_(2)@MHCS) for the largely boosted hydrogen evolution reaction(HER) performance. The combined advantages from the conductive support, oxyphilic MoSe_(2), and Ru active sites imparted a strong synergistic effect and charge redistribution in the Ru periphery which induced high catalytic activity, stability, and kinetics for HER. Specifically, the obtained Ru/MoSe_(2)@MHCS required a small overpotential of 25.5 and 38.4 mV to drive the kinetic current density of 10 mA cm^(-2)both in acid and alkaline media, respectively, which was comparable to that of the Pt/C catalyst. Experimental and theoretical results demonstrated that the charge transfer from MoSe_(2) to Ru NPs enriched the electronic density of Ru sites and thus facilitated hydrogen adsorption and water dissociation. The current work showed the significant interfacial engineering in Ru-based catalysts development and catalysis promotion effect understanding via the metal-support interaction.

关键词： Hydrogen evolution reaction Ruthenium Electrocatalyst MoSe_(2) Mesoporous hollow carbon spheres