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Shift in the percolation threshold of compressed composites—A 3D Monte Carlo simulation

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第10期11卷 822-826页

作者： Chuan LIN hong-tao wang Wei YANG Applied Mechanics Laboratory Department of Engineering Mechanics Tsinghua University Beijing 100084 China Institute of Applied Mechanics Zhejiang University Hangzhou 310027 China

The shift in the percolation threshold of compressed composites was studied by a 3D continuum percolation model. A Monte Carlo (MC) method was employed in the simulations. The percolation threshold was found to rise with the compression strain, which captures the basic trend in compression-induced conductivity variation from the experiments. Both fiber bending and texture formation contribute to the percolation threshold. The results suggest that fillers with a high aspect ratio are more desirable for sensor and electrical switch applications.

关键词： Monte Carlo (MC) model Percolation threshold Compressed composites

Simulations of thermal conductance across tilt grain boundaries in graphene

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Acta Mechanica Sinica 2012年第6期28卷 1528-1531页

作者： Peng wang Bo Gong Qiong Feng hong-tao wang Institute of Applied Mechanics Zhejiang University

Non-equilibrium molecular dynamics （MD） method was performed to simulate the thermal transporta- tion process in graphene nanoribbons （GNRs）. A convenient way was conceived to introduce tilt grain boundaries （GBs） into the graphene lattice by repetitive removing C atom rows along certain directions. Comprehensive MD simulations reveal that larger-angle GBs are effective thermal barriers and substantially reduce the average thermal conductivity of GNRs. The GB thermal conductivity is ~ 10 W-m-1 .K-l for a bicrystal GNR with a misorientation of 21.8%, which is -97 % less than that of a prefect GNR with the same size. The total thermal resistance has a monotonic dependence on the den- sity of the 5-7 defects along the GBs. A theoretical model is proposed to capture this relation and resolve the contribu- tions by both the reduction in the phonon mean free path and the defect-induced thermal resistance.

关键词： Graphene Thermal conductivity Grain bound-ary

Non-isothermal reduction process analysis of iron-bearing burden with charging iron coke hot briquette under simulated blast furnace conditions

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Journal of Iron and Steel Research International 2022年第5期29卷 741-750页

作者： hong-tao wang Man-sheng Chu Ji-wei Bao Zheng-gen Liu hong-ming Long School of Metallurgy Engineering Anhui University of TechnologyMa’anshan243032AnhuiChina State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang110819LiaoningChina School of Metallurgy Northeastern UniversityShenyang110819LiaoningChina Key Laboratory of Metallurgical Emission Reduction&Resources Recycling Anhui University of TechnologyMinistry of EducationMa’anshan243032AnhuiChina

Highly reactive iron coke hot briquette(ICHB)prepared by carbonizing the agglomerate of iron-bearing substance and blended coals is regarded as an alternative fuel to mitigate carbon emission and energy consumption of blast ***,the reduction process of iron-bearing burden is extremely crucial for blast furnace *** effects of ICHB on the non-isothermal reduction process of iron-bearing burden with different reduction properties were thus experimentally studied under the conditions of simulated blast furnace lump zone(below 1100°C),and the related mechanism was discussed and *** results showed that the non-isothermal reduction process of iron-bearing burden is promoted by adding *** the charging ratio of ICHB is increased from 0%to 30%,the reduction degree of pellet is increased from 22.91%to 36.62%,but the increased amplitude is leveled ***,the reduction degree of sinter is raised from 35.10%to 93.33%.It is also indicated that the promotion effect of ICHB on the non-isothermal reduction of iron-bearing burden depends on the reduction property of *** with the burden with poor reduction performance(such as pellet 1),the promotion is more significant for the burden with good reduction property(such as sinter 1)since the reduction reaction of iron oxide in iron-bearing burden and the gasification of carbon in ICHB are remarkably reinforced each *** practical application of ICHB in blast furnace should be utilized with highly reductive iron-bearing burden.

关键词： Iron coke hot briquette Non-isothermal reduction Iron-bearing burden Low carbon emission Blast furnace

Coordinated control of an intelligent wheelchair based on a brain-computer interface and speech recognition

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Journal of Zhejiang University-Science C(Computers and Electronics) 2014年第10期15卷 832-838页

作者： hong-tao wang Yuan-qing LI Tian-you YU School of Information Engineering Wuyi University School of Automation Science and Engineering South China University of Technology Engineering Research Center for Massive Biometric Information Processing

An intelligent wheelchair is devised, which is controlled by a coordinated mechanism based on a brain-computer interface(BCI) and speech recognition. By performing appropriate activities, users can navigate the wheelchair with four steering behaviors(start, stop, turn left, and turn right). Five healthy subjects participated in an indoor experiment. The results demonstrate the efficiency of the coordinated control mechanism with satisfactory path and time optimality ratios, and show that speech recognition is a fast and accurate supplement for BCI-based control systems. The proposed intelligent wheelchair is especially suitable for patients suffering from paralysis(especially those with aphasia) who can learn to pronounce only a single sound(e.g., ‘ah').

关键词： Brain-computer interface Speech recognition Coordinated control Intelligent wheelchair

Microstructure and properties of TiB_(2)-Ni coatings with different binder phase contents deposited by HVOF spray process

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Rare Metals 2022年第4期41卷 1385-1393页

作者： Xiao Chen hong-tao wang Gang-Chang Ji Xiao-Bo Bai Wei Fu School of Mechanical and Materials Engineering Jiujiang UniversityJiujiang 332005China

TiB_(2)–Ni coatings with different binder phase contents were sprayed on Q235 substrate by a high-velocity oxygen-fuel(HVOF)method using ball-milled *** microstructure,phase compositions,as well as thermal shock behavior,abrasive wear,and corrosion resistance to molten Al-12.07 wt%Si alloy performances of as-sprayed coatings were *** results show that the three TiB_(2)–Ni coatings structure is dense with low porosity,and the main phase compositions of the coatings are TiB_(2) and Ni similar to those of original *** coatings that have superior performance of thermal shock resistance have good bond to the substrate with no change in thick-ness and microstructure of ***,the coat-ings also have good durability in the molten Al-12.07 wt%Si after 60-h immersion *** the mass loss of Q235 steel is five times as much as that of TiB_(2)–50Ni coatings after abrasive wear test.

关键词： HVOF TiB_(2)-Ni Microstructure Abrasive wear Corrosion

Node dynamic relaxation method： principle and application

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Frontiers of Materials Science 2011年第2期5卷 179-195页

作者： hong-Yuan FANG tao wang Jun-Feng HU Jian-Guo YANG State Key Laboratory of Advanced Welding Production Technology Harbin Institute of Technology Harbin 150001 China

Two main methods, inactive eiement method and quiet element method, to simulate the process of multilayer ：and multipass welding：were reviewed, and the shortcomings of both methods were diScussed as well Based on these analyses, a method called node dynamic relaxation method was put into forward to simulate the multilayer and multipass welding process, and the principle and application of this method were discussed in detail. The simulating results show that using the node dynamic relaxation method can decrease mesh distortion, improve calculation efficiency, and obtain good simulation results. This method can also be used in the field of simulation addition or removing materials in finite element analysis.

关键词： inactive element methodl quiet element methodl node dynamic relaxation method multilayer and multipass Welding finite element analysis (FEA)

Modeling assessment of recovering iron from red mud by direct reduction： magnetic separation based on response surface methodology

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Journal of Iron and Steel Research International 2018年第5期25卷 497-505页

作者： Ran wang Zheng-gen Liu Man-sheng Chu hong-tao wang Wei Zhao Li-hua Gao School of Metallurgy Northeastern UniversityShenyang 110819 Liaoning China Northeastern Institute of Metal Materials Co. LtdShenyang 110108 Liaoning China

Red mud, the waste generated during alumina production, contains iron and other valuable metals. To recover the iron efficiently from red mud, a three-factor five-level central composite design in response surface methodology was used to study the effects of process parameters, such as FC/O （the molar ratio of fixed carbon in coal to reducible oxygen of iron oxide in red mud）, reduction temperature, reduction time, and their interaction on the iron recovery rate and total iron content in magnetic product obtained from the process of direct reduction-magnetic separation. The relevant assessment model was established. The model could predict the changing rules of iron recovery rate and total iron content in the magnetic product affected by the process parameters. The results show that the iron recovery rate is significantly influenced by three factors and reduction temperature plays the most important role. The iron recovery rate and total iron content in magnetic product could be up to 98.37 and 82.52%, respectively, under the numerically optimal process parameters condition of reduction temperature of 1400 ℃, FC/O of 0.80 and reduction time of 100 min obtained by the assessment model. The predicted values are in good agreement with the experimental values.

关键词： Red mud - Iron recovery Direct reduction Magnetic separation Response surface methodology

Effect of MgO content in sinter on the softening–melting behavior of mixed burden made from chromium-bearing vanadium–titanium magnetite

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International Journal of Minerals,Metallurgy and Materials 2016年第1期23卷 25-32页

作者： Zheng-gen Liu Man-sheng Chu hong-tao wang Wei Zhao Xiang-xin Xue School of Materials and Metallurgy Northeastern University

The effect of sinter with different MgO contents on the softening-melting behavior of mixed burden made from chro- mium-bearing vanadium-titanium magnetite was investigated. The results show that with increasing MgO content in the sinter, the softening interval and melting interval increased and the location of the cohesive zone shifted downward slightly and became moderately thicker. The softening-melting characteristic value was less pronounced when the MgO content in the sinter was 2.98wt%-3.40wt%. Increasing MgO content in the sinter reduced the content and recovery of V and Cr in the dripped iron. In addition, greater MgO contents in the sinter resulted in the generation of greater amounts of high-melting-point components, which adversely affected the permeability of the mixed burden. When the softening-melting behavior of the mixed burden and the recovery of valuable elements were taken into account, proper MgO con- tents in the sinter and slag ranged from 2.98wt% to 3.40wt% and from 11.46wt% to 12.72wt%, respectively, for the smelting of burden made from chromium-bearing vanadium-titanium magnetite in a blast furnace.

关键词： ironmaking magnetite magnesia softening melting behavior sinter blast furnace practice

Novel blast furnace operation process involving charging with low-titanium vanadium–titanium magnetite carbon composite hot briquette

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International Journal of Minerals,Metallurgy and Materials 2016年第5期23卷 501-510页

作者： Wei Zhao Man-sheng Chu hong-tao wang Zheng-gen Liu Ya-ting Tang School of Materials and Metallurgy Northeastern University

An innovative process of blast furnace （BF） operation involving charging with low-titanium vanadium-titanium magnetite carbon composite hot briquette （LVTM-CCB） was proposed for utilizing LVTM and conserving energy, In this study, the effect of LVTM-CCB charging ratio on the softening, melting, and dripping behaviors of the mixed burden was explored systemically, and the migration of valu- able elements V and Cr was extensively investigated. The results show that with increasing LVTM-CCB charging ratio, the softening inter- val T40 - T4 increases from 146.1℃ to 266.1℃, and the melting interval To - Ts first decreases from 137.2℃ to 129.5℃ and then increases from 129.5℃ to 133.2℃. Moreover, the cohesive zone becomes narrower and then wider, and its location shifts slightly downward. In addi- tion, the recovery ratios of V and Cr in dripped iron first increase and then decrease, reaching maximum values of 14.552% and 28.163%, respectively, when the charging ratio is 25%. A proper LVTM-CCB charging ratio would improve the softening--melting behavior of the mixed burden; however, Ti（C,N） would be generated rapidly in slag when the charging ratio exceeds 25%, which is not favorable for BF op- eration. When considering the comprehensive softening-melting behavior of the mixed burden and the recovery ratios of V and Cr, the rec- ommended LVTM-CCB charging ratio is 20%.

关键词： blast furnace practice charging magnetite briquets