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Effects of different introduction methods of Ce^4+and Zr^4+on denitration performance and anti-K poisoning performance of V2O5-WO3/TiO2 catalyst

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Journal of Rare Earths 2020年第11期38卷 1207-1214,I0003页

作者： Jun Cao Xiaojiang Yao Li chen Keke kang Min Fu Yang chen Research Center for Atmospheric Environment Key Laboratory of Reservoir Aquatic Environment of CASChongqing Institute of Green and Intelligent TechnologyChinese Academy of SciencesChongqing 400714China Chongqing Key Laboratory of Catalysis and New Environmental Materials College of Environment and ResourcesChongqing Technology and Business UniversityChongqing 400067China

The purpose of this work is to explore the effects of the introduction methods of Ce^4+and Zr^4+on the physicochemical properties,activity,and K tolerance of V2 O5-WO3/TiO2 catalyst for the selective catalytic reduction of NOx by *** different methods,namely pre-impregnation,post-impregnation,coimpregnation,and co-precipitation,were used to synthesize a series of V2 O5-WO3-TiO2-CeO2-ZrO2 *** catalysts were characterized by XRD,BET,NH3-TPD,XPS,and H2-TPR ***,the activity and anti-K poisoning performance were tested by an NH3-SCR model *** results show that the introduction of Ce^4+and Zr^4+can improve the catalytic performance of V2O5-WO3/TiO2 catalyst,but the impregnation method cannot enhance the anti-K poisoning ***^4+and Zr^4+introduced by co-precipitation method can effectively improve the tolerance of K,which is mainly due to the incorporation of Ce^4+and Zr^4+into TiO2 lattice to form a uniform TiO2-CeO2-ZrO2 solid solution,resulting in the optimal surface acidity and redox performance,and reducing the decreases caused by ***,based on the best introduction method,we further optimized the molar ratio of Ce^4+/Zr^4+,It is found that the catalyst exhibits the best anti-K poisoning performance when the molar ratio of Ce^4+/Zr^4+is 2:1.

关键词： V2O5-WO3/TiO2 denitration catalyst Ce^4+,Zr^4+modification Introduction methods Molar ratio Anti-K poisoning performance Rare Earths

Morphological characteristics and genetic differentiation of Lutraria maxima in coast waters off southeast China

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Journal of Oceanology and Limnology 2021年第4期39卷 1387-1402页

作者： kang chen Weifeng WANG Weilin ZHU Xiuli chen Huanling WANG Key Lab of Freshwater Animal Breeding Key Laboratory of Agricultural Animal GeneticsBreeding and ReproductionMinistry of EducationCollege of FisheryHuazhong Agricultural UniversityWuhan 430070China Guangxi Key Laboratory of Aquatic Genetic Breeding and Healthy Aquaculture Guangxi Academy of Fishery SciencesNanning 530021China

To explore genetic diversity and estimate the genetic differences among populations of Lutraria maxima in the coastal waters off south to southeast China,the morphology of the species of five different geographical populations(Beihai,Weizhou Island,Zhanjiang,Xiamen,and Fuzhou)in Guangxi,Guangdong,and Fujian provinces was studied statistically in combination with the microsatellite *** revealed by morphological principal component analysis(PCA),the cumulative contribution rate of the first three principal components was 72.596%.The discrimination accuracy ranged from 47.5%to 80.0%,and the scatter plots of principal component and discriminant analysis were consistent in overall,showing that the Xiamen and Fuzhou populations were overlapped *** microsatellite markers,10 pairs of polymorphic primers were obtained by high-throughput transcriptome sequencing,and used for genetic diversity *** was showed that the average number of alleles and eff ective alleles observed in each population ranged from 8.100 to 10.900,and from 3.497 to 4.228,*** average observed heterozygosity(H_(o))and expected heterozygosity(H_(e))in the five populations ranged from 0.541 to 0.615,and from 0.642 to 0.733,*** genetic distance(DA)ranged from 0.078 to 0.523,and the population genetic differentiation index(F_(ST))ranged from 0.027 to *** unweighted pair-population method with arithmetic means(UPGMA)and structure analysis showed that the five populations could be divided into two main clusters,the Beibu Gulf group(Beihai and Weizhou Island)and the Southeast China Sea group(Zhanjiang,Xiamen,and Fuzhou),suggesting that *** has been separated geographically by the barrier of the Leizhou Peninsula into two groups in evolution,which provided us with a scientific clue to better protect the bioresource and establish an appropriate fishery management stocks for *** populations in south China.

关键词： Lutraria maxima morphological difference microsatellite markers genetic diversity genetic differentiation transcriptome

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Optimal Design for Anti-Skid Control of Electric Vehicles by Fuzzy Approach

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Chinese Journal of Mechanical Engineering 2021年第5期34卷 376-389页

作者： chenming Li Han Zhao kang Huang Ye-Hwa chen School of Mechanical Engineering Hefei University of TechnologyHefeiChina AnHui Key Laboratory of Digital Design and Manufacturing Hefei University of TechnologyHefeiChina National Engineering Laboratory for Highway Maintenance Equipment Chang’an UniversityXi’anChina The George W.Woodruff School of Mechanical Engineering Georgia Institute of TechnologyAtlantaUSA

In this paper,a new fuzzy approach is applied to optimal design of the anti-skid control for electric *** anti-skid control is used to maintain the wheel speed when there are *** control is able to provide an appropriate torque for wheels when the vehicle is about to *** friction coefficient and the moments of inertia of wheels and motor are considered as uncertain *** nonlinear,bounded and time-varying uncertainties are described by fuzzy set *** control is deterministic and is not based on IF-THEN fuzzy ***,the optimal design for this fuzzy system and control cost is proposed by fuzzy *** this way,the uniform boundedness and uniform ultimate boundedness are guaranteed and the average fuzzy performance is *** simulations show that the control can prevent vehicle skidding with the minimum control cost under uncertainties.

关键词： High-order control Fuzzy set theory Uncertainty Optimal design

Joint time delay and energy optimization with intelligent overclocking in edge computing

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Science China(Information Sciences) 2020年第4期63卷 154-169页

作者： Kehao WANG Zhenhua XIONG Lin chen Pan ZHOU Hyundong shin School of Information Engineering Wuhan University of Technology Hubei Key Laboratory of Inland Shipping Technology Wuhan University of Technology School of Data and Computer Science Sun Yat-Sen University School of Cyber Science and Engineering Huazhong University of Science and Technology Department of Electronic Engineering Kyung Hee University

With the rapid growth of user equipment(UE), the amount of data transmitted over networks has become enormous, exerting immense pressure on backbone networks and central cloud ***, corresponding applications requiring high energy consumption and low latency have multiplied the requirements for UE. Mobile edge computing(MEC) has been proposed to support the offloading of UE tasks to edge clouds for execution. The implementation of MEC requires fast data transmission between UE and edge servers, and the emerging 5G network appears to render this technology possible. In this paper,considering a large number of UE, a fixed MEC server, and an advanced intelligent network, we suggest an intelligent overclocking mechanism for the MEC server that operates for an intelligently calculated period to allow it to leverage more computing power without introducing additional hardware resources for a certain period of time. We jointly manage task offloading, server resource allocation, and overclocking to minimize the system-wide computation overhead and other risks. The proposed optimization problem is a mixedinteger nonlinear programming problem that is divided into three subproblems: offloading decision, resource allocation, and overclocking decision. We solve these subproblems using non-convex techniques and provide an iterative algorithm to obtain a heuristic solution for the original problem. Finally, simulation results show that the overclocked MEC server has lower system-wide computation overhead, faster task processing, and more offloaded UE as compared with the case without overclocking.

关键词： overclocking intelligent network mobile edge computing computation offloading resource allocation

Redox Charge Transfer Kinetics and Reversibility of VO_(2) in Aqueous and Non-Aqueous Electrolytes of Na-Ion Storage

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Energy & Environmental Materials 2022年第4期5卷 1222-1228页

作者： Sul Ki Park kang Ho shin Puritut Nakhanivej Harpalsinh H.Rana Ho Seok Park School of Chemical Engineering College of EngineeringSungkyunkwan University2066Seobu-roJangan-guSuwon-si Gyeonggi-do 440-746Republic of Korea Department of Engineering University of CambridgeCambridge CB30FSUK Department of Health Sciences and Technology Samsung Advanced Institute for Health Sciences and Technology(SAIHST)Sungkyunkwan University2066SeoburoJangan-guSuwon 440-746South Korea SKKU Advanced Institute of Nano Technology(SAINT) Sungkyunkwan University2066SeoburoJangan-guSuwon 440-746South Korea

The deep understanding about the electrochemical behavior of the nanostructured electrode in electrolytes provides crucial insights for the rational design of electrode for sodium(Na)-ion storage system(NIS).Here,we report redox charge transfer kinetics and reversibility of VO_(2)(B) nanorod electrodes in both aqueous and organic electrolytes for *** assynthesized VO_(2)(B) nanorods show the reversible redox reaction with the higher specific and rate capacitances at high current density in aqueous electrolytes than in organic ***-dependent impedance measurements demonstrate the more facile interfacial charge transfer of Na ions into VO_(2)(B) nanorods in aqueous *** reversible evolution in oxidation state and chemical composition of VO_(2)(B) nanorods is observed in aqueous electrolytes,as confirmed by ex situ XRD and ex situ X-ray photoelectron spectroscopy *** by the facile and reversible pseudocapacitive feature,the electrochemical performances of VO_(2)(B) nanorods are further improved by constructing the hierarchical structure of the reduced graphene oxide-VO_(2) composite for aqueous Na+ion storage.

关键词： aqueous electrolyte energy storage mechanism hierarchical structure nanorod sodium ion storage

Fatigue Crack Growth in Cold-Rolled and Annealed Polycrystalline Superelastic NiTi Alloys

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Acta Mechanica Solida Sinica 2018年第5期31卷 599-607页

作者： Junyu chen Hao Yin Guozheng kang Qingping Sun School of Civil Engineering Wuhan University Wuhan 430072 China State Key Laboratory-of Traction Powerl Southwest Jiaotong University Chengdu 610031 China Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and Technology Kowloon Hong Kong China

The fatigue crack growth in cold-rolled （CR） and annealed （AN） polycrystalline superelastic NiTi shape memory alloys under cyclic stressing are investigated. The fatigue crack growth morphologies of compact tension specimens are recorded. Experimental results show that the main cracks of the AN specimens grow along the original crack plane, while the crack paths of the CR specimens orient at 18° angle to the original horizontal crack plane. The latter is due to the strong anisotropy of elastic modulus and hardness after the cold rolling. Besides, the fatigue crack growth rates of the AN specimens in the regime of △K = 4 MPa√m-9 MPa√m are lower than those of the CR ones. The AN specimens have higher fatigue crack growth resistance than the CR specimens due to the stronger shielding mechanism caused by plastic deformation and reduced anisotropy by annealing.

关键词： Fatigue crack growth NiTi Anisotropy Shielding mechanism

Cobalt phosphide nanoparticles embedded in nitrogendoped carbon nanosheets： Promising anode material with high rate capability and long cycle life for sodiumion batteries

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Nano Research 2017年第12期10卷 4337-4350页

作者： Kai Zhang Mihui Park Jing Zhang Gi-Hyeok Lee Jeongyim shin Yong-Mook kang Department of Energy and Materials Engineering Dongguk University-Seoul Seoul 100-715 Republic of Korea

Cobalt phosphide （COP） nanoparticles which were uniformly embedded in N-doped C nanosheets （CNSs） were fabricated via the simple one-step calcination of a Co-based metal-organic framework （MOF） and red P and exhibited a high capacity, fast kinetics, and a long cycle life. This CoP/CNS composite contained small CoP particles （approximately 11.3 nm） and P-C bonds. When its electrochemical properties were evaluated by testing CoP/Na coin cells, the composite delivered a Na-storage capacity of 598 mAh·g-1 at 0.1 A·g-1 according to the total mass of the composite, which means that the capacity of pure CoP reached 831 mAh·g-1 The composite also exhibited a high rate capability and long-term cyclability （174 mAh·g-1 at 20 A·g-1 and 98.5% capacity retention after 900 cycles at 1 A·g-1）, which are commonly attributed to robust P-C bonding and highly conductive CNSs. When the reaction mechanism of the CoP/CNS composite was investigated, a conversion reaction expressed as CoP ＋ 3Na＋＋ 3e＋＋ Co ＋ Na3P was observed. The outstanding Na-storage properties of the CoP/CNS composite may suggest a new strategy for developing high-performance anode materials for Na-ion batteries.

关键词： cobalt phosphide N-doped C nanosheets anode materials Na-ion batteries high performance

Spinodal Decomposition of Ultrahigh Strength Steel 23Co14Ni12Cr3

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Journal of Materials Science & Technology 1999年第6期15卷 583-584页

作者： Wang, LD chen, CL kang, MK Northwestern Polytech Univ Xian 710072 Peoples R China

The depleted and enriched regions of solute atoms formed by spinodal decomposition in the early stage of tempering for ultrahigh strength steel 23Co14Ni12Cr3 were first confirmed by means of transmission electron microscopy (TEM). The segregation of solute atoms provides favorable composition and structure fluctuation for the formation of secondary hardening phase M2C and cementite Fe3C.

关键词： Cr Co Spinodal Decomposition of Ultrahigh Strength Steel 23Co14Ni12Cr3 Ni

Synthesis and properties of Cr-Al-Si-N films deposited by hybrid coating system with high power impulse magnetron sputtering (HIPIMS) and DC pulse sputtering

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中国有色金属学会会刊：英文版 2012年第S3期22卷 729-734页

作者： Min Su kang Tie-gang WANG Jung Ho shin Roman NOWAK Kwang Ho KIM School of Materials Science and Engineering Pusan National University State Key Laboratory of Corrosion and Protection Institute of Metal ResearchChinese Academy of Sciences National Core Research Center for Hybrid Materials Solution Pusan National University Extreme Energy-Density Research Institute Nagaoka University of Technology School of Chemical Technology Aalto University

The CrN and Cr-Al-Si-N films were deposited on Si wafer and SUS 304 substrates by a hybrid coating system with high power impulse magnetron sputtering (HIPIMS) and a DC pulse sputtering using Cr and AlSi targets under N2/Ar *** varying the sputtering current of the AlSi target in the range of 0-2.5 A,both the Al and Si contents in the films increased gradually from 0 to 19.1% and 11.1% (mole fraction),*** influences of the AlSi cathode DC pulse current on the microstructure,phase constituents,mechanical properties,and oxidation behaviors of the Cr-Al-Si-N films were investigated *** results indicate that the as-deposited Cr-Al-Si-N films possess the typical nanocomposite structure,namely the face centered cubic (Cr,Al)N nano-crystallites are embedded in the amorphous Si3N4 *** increasing the Al and Si contents,the hardness of the film first increases from 20.8 GPa for the CrN film to the peak value of 29.4 GPa for the Cr0.23Al0.14Si0.07 N film,and then decreases *** the meanwhile,the Cr0.23Al0.14Si0.07N film also possesses excellent high-temperature oxidation resistance that is much better than that of the CrN film at 900 or 1000 °C.

关键词： Cr-Al-Si-N film high power impulse magnetron sputtering DC pulsed sputtering high-temperature oxidation resistance