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Modeling of gas porosity and microstructure formation during dendritic and eutectic solidification of ternary Al-Si-Mg alloys

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Journal of Materials Science & Technology 2021年第17期76卷 76-85页

作者： Mengdan Hu taotao wang Hui Fang Mingfang Zhu Jiangsu Key Laboratory of Advanced Metallic Materials School of Materials Science and EngineeringSoutheast UniversityNanjing211189China

A two-dimensional(2-D)multi-component and multi-phase cellular automaton(CA)model coupled with the Calphad method and finite difference method(FDM)is proposed to simulate the gas pore formation and microstructures in solidification process of hypoeutectic Al-Si-Mg *** this model,the pore growth,and dendritic and eutectic solidification are simulated using a CA *** achieve the equilibrium among multiple phases during ternary Al-based alloy solidification,the phase transition thermodynamics and kinetics are evaluated by adopting the Calphad *** diffusion equations of hydrogen and two solutes are solved by *** developed CA-FDM coupled model can be used for simulating the evolution of gas microporosity and microstructures,involving dendrites and irregular binary and ternary eutectics,of ternary hypoeutectic Al-Si-Mg *** has the capability of reproducing the interactions between the hydrogen microporosity formation and the growth of dendrites and eutectics,the competitive growth among the growing gas pores of different sizes,together with the time-evolving concentration fields of hydrogen and *** simulated morphology of gas pore and microstructure has a good agreement with the experimental *** influences of the initial hydrogen concentration and cooling rate on the microporosity formation are *** is found that the main portion of porosity formation occurs in the eutectic solidification stage through analyzing the profiles of porosity percentage and solid fraction varying with solidification *** varying features of simulated porosity percentage,the maximum and average pores radii indicate that increasing initial hydrogen concentration promotes the formation of higher final porosity percentage and larger pores,while the size of gas pores will significantly reduce with increasing cooling rate,leading to a lower final porosity percentage.

关键词： Porosity Solidification microstructures Ternary Al-Si based alloys Diffusion Cellular automaton

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Decision-feedback multiple symbol detection for differential space-time block coded UWB systems

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Science China(Information Sciences) 2013年第4期56卷 50-59页

作者： LV TieJun wang taotao GAO Hui Key Laboratory of Trustworthy Distributed Computing and Service Ministry of EducationBeijing University of Posts and Telecommunications Department of Information Engineering The Chinese University of Hong Kong

The symbol-by-symbol differential detection scheme,originally employed to detect differential spacetime block coded(DSTBC) ultra-wideband(UWB) signal in previous work,su?ers from a performance degradation compared with coherent *** this paper,a noncoherent multiple symbol detection(MSD) scheme is proposed to enhance the performance of DSTBC-UWB *** the signal model of DSTBC-UWB is analyzed,the optimal maximum likelihood(ML) MSD is derived and then a suboptimal ML-MSD is obtained by channel ***,exhaustive search based MSD is impractical in DSTBC-UWB systems since its complexity increases exponentially with observation window *** decrease the computational complexity,the decision-feedback(DF) scheme is introduced to *** resultant DF-MSD yields reasonable complexity and solid performance improvement.

关键词： ultra-wideband(UWB) space-time block code(STBC) differential detection multiple symbol detection(MSD)

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A molecular cobaloxime cocatalyst and ultrathin FeOOH nanolayers co-modifiedBiVO_(4) photoanode for efficient photoelectrochemical water oxidation

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Journal of Energy Chemistry 2022年第6期31卷 497-505,I0014页

作者： Hongyun Cao taotao wang Jiaxing Li Jinbao Wu Pingwu Du Hefei National Laboratory for Physical Sciences at the Microscale CAS Key Laboratory of Materials for Energy ConversionDepartment of Materials Science and EngineeringiChEM(Collaborative Innovation Center of Chemistry for Energy Materials)University of Science and Technology of ChinaHefei 230026AnhuiChina National Synchrotron Radiation Laboratory University of Science and Technology of China443 Huangshan RoadHefei 230029AnhuiChina

BiVO_(4) has been attracting a lot of interest in photoelectrochemical (PEC) water oxidation due to its efficient solar absorption and appropriate band *** far,sluggish water oxidation kinetics and fast photogenerated charge recombination still hinder the PEC performance ofBiVO_(4) .In this study,a novel PEC photoanode was designed by depositing ultrathin FeOOH nanolayers on the surface of nanoporousBiVO_(4) electrode,followed by modification with a cobaloxime (Co(dmgH)_(2)(4-COOH-py)Cl) molecular *** irradiation of a 100 mW cm^(-2)(AM 1.5G) Xe lamp,the photocurrent density of the cobaloxime/FeOOH/BiVO_(4) composite photoanode reached 5.1 mA cm^(-2)at 1.23 V *** in 1.0 M potassium borate buffer solution (pH=9.0).The onset potential of the optimal cobaloxime/FeOOH/BiVO_(4) photoanode exhibited a 460 m V cathodic shift relative to bareBiVO_(4) .In addition,the surface charge injection efficiency of the composite photoanode reached~80%at 1.23 V *** and the incident photon-to-current efficiency (IPCE) reached~88%at 420 nm.

关键词： BiVO_(4) Photoelectrochemical water oxidation Cobaloxime Charge injection efficiency Synergistic effect

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Self-supported Ni2P nanosheets on low-cost three-dimensional Fe foam as a novel electrocatalyst for efficient water oxidation

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Journal of Energy Chemistry 2020年第3期29卷 71-76页

作者： Mengrong Zhang taotao wang Hongyun Cao Shengsheng Cui Pingwu Du Hefei National Laboratory for Physical Sciences at Microscale CAS Key Laboratory of Materials for Energy ConversionDepartment of Materials Science and EngineeringiChEM(Collaborative Innovation Center of Chemistry for Energy Materials)University of Science and Technology of China(USTC)Hefei 230026AnhuiChina National Synchrotron Radiation Laboratory University of Science and Technology of China(USTC)Hefei 230029AnhuiChina

Electrochemical water splitting into hydrogen and oxygen is a promising strategy for future renewable energy conversion *** oxygen evolution reaction(OER)is considered as the bottleneck reaction in an overall water splitting system because it involves 4e- and 4H+ transfer ***,it is highly desirable to explore low-cost alternative catalysts for OER at ambient ***,we report for the first time that nickel phosphide(Ni2P)nanosheets can be facilely grown on Fe foam(FF)as an efficient electrocatalyst for OER with excellent durability and catalytic activity under alkaline *** reach a current density of 10 m A/cm2,the Ni2P-FF catalyst required a low overpotential of only 198 mV for *** catalyst’s high OER activity and durability were well maintained at a high current *** required overpotentials were only 267 and 313 mV to achieve the current densities of 100 and 300 m A/cm2,*** combination of low-cost Fe foam with Ni2P provides a promising low-cost catalyst for large-scale application of electrocatalytic water splitting.

关键词： Low-cost electrocatalyst Metal phosphide Fe foam Water oxidation

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On Designs of Decentralized Reputation Management for Permissioned Blockchain Networks

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Computer Modeling in Engineering & Sciences 2024年第5期139卷 1755-1773页

作者： Jinyu Chen Long Shi Qisheng Huang taotao wang Daojing He School of Electronic and Optical Engineering Nanjing University of Science and TechnologyNanjing210094China School of Mechanical Engineering and Automation Harbin Institute of TechnologyShenzhen518055China College of Electronics and Information Engineering Shenzhen UniversityShenzhen518060China School of Computer Science and Technology Harbin Institute of TechnologyShenzhen518055China

In permissioned blockchain networks,the Proof of Authority(PoA)consensus,which uses the election of authorized nodes to validate transactions and blocks,has beenwidely advocated thanks to its high transaction throughput and fault ***,PoA suffers from the drawback of centralization dominated by a limited number of authorized nodes and the lack of anonymity due to the round-robin block proposal *** a result,traditional PoA is vulnerable to a single point of failure that compromises the security of the blockchain *** address these issues,we propose a novel decentralized reputation management mechanism for permissioned blockchain networks to enhance security,promote liveness,and mitigate centralization while retaining the same throughput as traditional *** paper aims to design an off-chain reputation evaluation and an on-chain reputation-aided ***,we evaluate the nodes’reputation in the context of the blockchain networks and make the reputation globally verifiable through smart ***,building upon traditional PoA,we propose a reputation-aided PoA(rPoA)consensus to enhance securitywithout sacrificing *** particular,rPoA can incentivize nodes to autonomously form committees based on reputation authority,which prevents block generation from being tracked through the randomness of reputation ***,we develop a reputation-aided fork-choice rule for rPoA to promote the network’s ***,experimental results show that the proposed rPoA achieves higher security performance while retaining transaction throughput compared to traditional PoA.

关键词： Blockchain reputation management PoA throughput security decentralization

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Cyclin gene SlCycB1 alters plant architecture in association with histone H3.2 in tomato

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Horticultural Plant Journal 2022年第3期8卷 341-350页

作者： Tingyan Zhang Yaru wang Shoaib Munir taotao wang Zhibiao Ye Junhong Zhang Yuyang Zhang Key Laboratory of Horticultural Plant Biology(Ministry of Education) College of Horticulture and Forestry ScienceHuazhong Agricultural UniversityWuhan 430070China Hubei Hongshan Laboratry Wuhan 430070China

Cell cycle regulation plays a critical role in plant growth and *** this study,the role of a tomato cell cycle gene SlCycB1 has been *** analysis revealed that SlCycB1 was mostly expressed in stem,root,and leaves,with relative lower expression in flower and *** plants overexpressing SlCycB1 exhibited a reduction in cell number and increased cell size leading to the growth ***,yeast two-hybrid analysis and bimolecular fluorescence complementation revealed that SlCycB1 interacted with histone H3.2,an essential component of the *** H3.2 was transcriptionally up-regulated in the SlCycB1 overexpressing tomato ***,the overexpression of histone H3.2 in transgenic plants showed similar phenotypes to SlCycB1 overexpressing *** on these findings,we concluded that SlCycB1 overexpression altered tomato architecture in association with histone H3.2.

关键词： Tomato Cyclin SlCycB1 Histone Growth and development

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Synthesis of light hydrocarbons over Fe/AC catalysts

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International Journal of Mining Science and Technology 2012年第2期22卷 209-212页

作者： Zhao Jianjun Zong Zhimin wang taotao Liu Tong Wei Xianyong Departrnent of Applied Chemistry and Environment Engineering Bengbu CollegeBengbu 233030China School of Chemical Engineering and Technology China University of Mining&TechnologyXuzhou 221008China

A series of Fe/AC catalysts for catalytic hydrogenation of CO to light hydrocarbons(LHCs) were prepared by decomposing Fe(CO)5 in an *** catalysts activities were tested in a high-pressure micro *** results show that both CO conversion and LHCs selectivity were significantly affected by the amount of Fe loaded onto the *** optimum Fe content was determined to be 10% by weight of the *** the corresponding catalyst(i.e.,10% Fe/C catalyst),the conversion of CO and the selectivity of LHCs were 94.8% and 59.2%,respectively,at 360 °*** on various catalyst characterization techniques,such as XRD,BET and SEM,the catalysts surface areas and pore volume decreased and the smaller particles agglomerated at the edges and corners in the outer region of the support with the increasing Fe *** agglomerated particles increased greatly when the iron content of the catalyst was higher than 10%.The decrease of catalyst activity can be due to the agglomerated particles.

关键词： CO hydrogenationFe/AC catalystsLight hydrocarbonsParticles agglomerated

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Optimization of High-Concurrency Conflict Issues in Execute-Order-Validate Blockchain

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ZTE Communications 2024年第2期22卷 19-29页

作者： MA Qianli ZHANG Shengli wang taotao YANG Qing wang Jigang Shenzhen University Shenzhen 518000China ZTE Corporation Shenzhen 518057China

With the maturation and advancement of blockchain technology,a novel execute-order-validate(EOV)architecture has been proposed,allowing transactions to be executed in parallel during the execution ***,parallel execution may lead to multi-version concurrency control(MVCC)conflicts during the validation phase,resulting in transaction *** on different causes,we categorize conflicts in the EOV blockchain into two types:within-block conflicts and cross-block conflicts,and propose an optimization solution called FabricMan based on Fabric *** within-block conflicts,a reordering algorithm is designed to improve the transaction success rate and parallel validation is implemented based on the transaction conflict *** also merge transfer transactions to prevent triggering multiple version *** cross-block conflicts,a cache-based version validation mechanism is implemented to detect and terminate invalid transactions in *** comparisons are conducted between FabricMan and two other systems,Fabric and Fabric++.The results show that FabricMan outperforms the other two systems in terms of throughput,transaction abort rate,algorithm execution time,and other experimental metrics.

关键词： blockchain MVCC conflict reordering parallel validation transaction merging

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The loss of function of HEL,which encodes a cellulose synthase interactive protein,causes helical and vine-like growth of tomato

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Horticulture Research 2020年第1期7卷 493-502页

作者： Qihong Yang Xiaoshuai Wan Jiaying wang Yuyang Zhang Junhong Zhang taotao wang Changxian Yang Zhibiao Ye Key Laboratory of Horticultural Plant Biology Ministry of EducationHuazhong Agricultural UniversityWuhan 430070China

Helical growth is an economical way for plant to obtain *** classic microtubule–microfibril alignment model of Arabidopsis helical growth involves restriction of the appropriate orientation of cellulose microfibrils appropriately in the cell ***,the molecular mechanism underlying tomato helical growth remains ***,we identified a spontaneous tomato helical(hel)mutant with right-handed helical cotyledons and petals but left-handed helical stems and true *** analysis revealed that the hel phenotype was controlled by a single recessive *** map-based cloning,we cloned the HEL gene,which encodes a cellulose interacting protein homologous to CSI1 of *** identified a 27 bp fragment replacement that generated a premature stop *** experiments showed that the helical growth phenotype could be restored by the allele of this gene from wild-type *** contrast,the knockout mutation of HEL in Pyriforme via CRISPR/Cas9 resulted in helical *** findings shed light on the molecular control of the helical growth of tomato.

关键词： helical cellulose walls

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Microwave-assisted hydroxylation of benzene to phenol with H_2O_2 over FeSO_4/SiO_2

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Mining Science and Technology 2010年第1期20卷 93-96页

作者： LIU Tong WEI Xianyong ZHAO Jianjun XIE Hengsen wang taotao ZONG Zhimin School of Chemical Engineering and Technology China University of Mining & Technology Xuzhou 221008 China Key Laboratory of Coal Conversion and New Carbon Materials Wuhan University of Science & Technology Wuhan 430081 China

Hydroxyl radicals HO are generated under Fenton-like (Fe2++H2O2→HO?+OH?+Fe3+) catalytic conditions upon microwave irradiation. Liquid-phase direct catalytic oxidation of benzene to phenol was obtained using FeSO4 supported on silica gel as a solid catalyst and hydrogen peroxide as the oxidant. The effects of various parameters, such as the different solvents, the amount of solvent used, the amount of catalyst used, the reaction time, the reaction temperature and the amount of hydrogen peroxide used on the yield of phenol were studied to identify optimum reaction conditions. Conventionally heated reaction gives a phenol yield of 0.6%. A higher phenol yield of 13.9% with a selectivity of 100% is obtained when the reaction mixture was irradiated with micro-wave energy. It is concluded that microwave irradiation offers more effective control of energy input for hydroxyl radical generation that is appropriate for various synthetic reactions.

关键词： hydroxyl radicals Fenton catalytic conditions microwave energy

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