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Some recent advances in 3D crack and contact analysis of elastic solids with transverse isotropy and multifield coupling

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Acta Mechanica Sinica 2015年第5期31卷 601-626页

作者： wei-qiu Chen Department of Engineering Mechanics Zhejiang University

Significant progress has been made in mixed boundary-value problems associated with three-dimensional（3D） crack and contact analyses of advanced materials featuring more complexities compared to the conventional isotropic elastic *** include material anisotropy and multifield coupling,two typical characteristics of most current multifunctional *** this paper we try to present a state-of-the-art description of 3D exact/analytical solutions derived for crack and contact problems of elastic solids with both transverse isotropy and multifield coupling in the latest decade by the potential theory method in the spirit of *** ingenious breakthrough brings new vigor and vitality to the old research subject of classical potential *** are particularly interested in crack and contact problems with certain nonlinear *** is also placed on the coupling between the temperature field（or the like） and other physical fields（e.g.,elastic,electric,and magnetic fields）.We further highlight the practical significance of 3D contact solutions,in particular in applications related to modern scanning probe microscopes.

关键词： Crack Contact Mixed boundary-value problem Transverse isotropy Multifield coupling Potential theory Exact solution Scanning probe microscope

THE EFFECTS OF MARKET DEPTH ON THE ARRIVAL RATE OF ORDERS

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Journal of Systems Science & Complexity 2014年第6期27卷 1192-1203页

作者： ZHANG qiang LIU Shancun qiu Wanhua School of Economics and Management Beijing University of Chemical Technology School of Economics and Management Beihang University

This paper presents a model to describe the dynamic trading process in limit order *** studying the dynamic pattern of execution probabilities of limit orders with both time and the depth of limit order book,the authors conclude with the following properties:Arrival rates of market buy orders increase as the depth of buy queue in the book increases and decrease as the depth of sell queue increases,and vice versa;similar regularities for the arrival rate of market sell orders;both the arrival rate of market buy order and market sell orders increase as the depth of both sides in the book increases by the same ***,the authors describe more detailed temporary and permanent effects of the market depth on the arrival rates of orders.

关键词： Arrival rate limit order market market depth private value.

Nickel leaching from low-grade nickel matte using aqueous ferric chloride solution

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Rare Metals 2019年第12期38卷 1199-1206页

作者： Zhi-qiang Ning Hong-wei Xie qiu-Shi Song Hua-Yi Yin Yu-Chun Zhai School of Metallurgy Northeastern University

Nickel leaching from low-grade nickel matte(LGNM) using aqueous ferric chloride solution was *** influence of factors such as leaching temperature and concentration of ferric chloride on the nickel leaching ratio was *** results show that increasing leaching temperature and concentration of ferric chloride increases the nickel leaching *** overall nickel leaching process follows the unreacted shrinking core model,and the surface chemical reaction is the rate-controlling *** activation energy and the reaction order of the nickel leaching process,controlled by the surface chemical reaction,were calculated to be 52.96 kJ mol^(-1)and 0.5,***,the kinetics equation for the nickel leaching was found to be 1-(1-α)^(1/3)=7.18×10~4C^(0.5)exp[-52,960/(RT)]t.

关键词： Nickel matte Ferric chloride Sulfur Kinetics

Formation of fine crystalline dolomites in lacustrine carbonates of the Eocene Sikou Depression, Bohai Bay Basin, East China

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Petroleum Science 2016年第4期13卷 642-656页

作者： Yong-qiang Yang Long-wei qiu Jay Gregg Zheng Shi Kuan-Hong Yu School of Geosciences China University of Petroleum Department of Geology Oklahoma State University

The genesis of the fine crystalline dolomites that exhibit good to excellent reservoir properties in the upper fourth member of the Eocene Shahejie Formation（Es4s）around the Sikou Sag, Bohai Bay Basin, is uncertain. This paper investigates the formation mechanisms of this fine crystalline dolomite using XRD, SEM, thin section analysis and geochemical data. The stratigraphy of the Sikou lacustrine carbonate is dominated by the repetition of metre-scale, high-frequency deposition cycles, and the amount of dolomite within a cycle increases upward from the cycle bottom. These dolomite crystals are 2–30 μm in length, subhedral to anhedral in shape and typically replace both grains and matrix. They also occur as rim cement and have thin lamellae within ooid cortices. Textural relations indicate that the dolomite predates equant sparry calcite cement and coarse calcite cement. The Sr concentrations of dolomites range from 900 to 1200 ppm. Dolomite δ18O values（-11.3 to-8.2 ‰ PDB） are depleted relative to calcite mudstone（-8.3 to-5.4 ‰ PDB） that precipitated from lake water, while δ13C values（0.06–1.74 ‰ PDB） are within the normal range of calcite mudstone values（-2.13 to 1.99 ‰ PDB）. High87Sr/86Sr values（0.710210–0.710844） indicate that amounts of Ca2＋ and Mg2＋have been derived from the chemical weathering of Palaeozoic carbonate bedrocks. The high strontium concentration indicates that hypersaline conditions were maintainedduring the formation of the dolomites and that the dolomites were formed by the replacement of precursor calcite or by direct precipitation.

关键词： Dolomite Lacustrine carbonate Eocene Sikou Sag Bohai Bay Basin

Towards the establishment of the light J^(P(C))=1^(-(+))hybrid nonet

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Chinese Physics C 2022年第5期46卷 1-10页

作者： Lin qiu qiang Zhao Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China China Center of Advanced Science and Technology Chinese Academy of SciencesBeijing 100080China

The observation of the light hybrid candidateη_(1)(1855)by the BESⅢ Collaboration offers great opportunities for advancing our knowledge on exotic hadrons in terms of flavor *** demonstrate that this observation provides a crucial clue for establishing the J^(P(C))=1^(−(+))hybrid *** on the flux tube model picture,the production and decay mechanisms for the J^(P(C))=1^(−(+))hybrid nonet in the J/ψradiative decays into two pseudoscalar mesons are *** the I=0 sector,we deduce that the SU(3)flavor octet and singlet mixing is non-negligible and apparently deviates from the flavor ideal *** only signals for one isoscalarη_(1)(1855)are observed in theηη′channel,we investigate two schemes of the nonet structure in whichη_(1)(1855)can either be the higher or lower mass state that strongly couples toηη′.Possible channels for detecting the multiplets are *** particular,a combined analysis of the hybrid production in J/ψ→VH,where V and H denote the light vector mesons and 1^(−(+))hybrid states,respectively,may provide further evidence for this nonet structure and ultimately establish these mysterious exotic species in the experiment.

关键词： exotic hadrons hybrid quark model

Co-seismic Landslide Inventory and Susceptibility Mapping in the 2008 Wenchuan Earthquake Disaster Area,China

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Journal of Mountain Science 2013年第3期10卷 339-354页

作者： LI wei-le HUANG Run-qiu TANG Chuan XU qiang Cees van WESTEN State key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of Technology Faculty of Geoinformation Science and Earth Observation (ITC) University of Twente

The Ms 8.0 May 12,2008 Wenchuan earthquake triggered tens of thousands of *** widespread landslides have caused serious casualties and property losses,and posed a great threat to post-earthquake reconstruction.A spatial database,inventoried 43,842 landslides with a total area of 632 km 2,was developed by interpretation of multi-resolution remote sensing *** landslides can be classified into three categories:swallow,disrupted slides and falls;deep-seated slides and falls,and rock *** correlation between landslides distribution and the influencing parameters including distance from co-seismic fault,lithology,slope gradient,elevation,peak ground acceleration(PGA) and distance from drainage were *** distance from co-seismic fault was the most significant parameter followed by slope gradient and PGA was the least significant one.A logistic regression model combined with bivariate statistical analysis(BSA) was adopted for landslide susceptibility *** study area was classified into five categories of landslide susceptibility:very low,low,medium,high and very high.92.0% of the study area belongs to low and very low categories with corresponding 9.0% of the total inventoried *** susceptible zones make up 4.2% of the area with 17.7% of the total *** rest of the area was classified into high and very high categories,which makes up 3.9% of the area with corresponding 73.3% of the total *** the susceptibility map can reveal the likelihood of future landslides and debris flows,and it is helpful for the rebuilding process and future zoning issues.

关键词： Wenchuan Earthquake Landslide Inventory Susceptibility mapping Logistic regression

Synergistic Flame-retardant Effect of Epoxy Resin Combined with Phenethyl-bridged DOPO Derivative and Graphene Nanosheets

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Chinese Journal of Polymer Science 2019年第1期37卷 79-88页

作者： wei Yan Ming-qiu Zhang Jie Yu Sheng-qiang Nie Dai-Qin Zhang Shu-Hao Qin School of Chemistry Sun Yat-sen University School of Chemistry and Materials Engineering Guiyang University National Engineering Research Center for Compounding and Modification of Polymer Materials

Phenethyl-bridged DOPO derivative(DiDOPO)was combined with graphene nanosheets(GNSs)in epoxy resin(EP)to improve its flame *** results indicated that the introduction of only 1.5 wt%DiDOPO/1.5 wt%GNS in EP increased the limited oxygen index(LOI)from 21.8%to 32.2%,hence meeting UL 94 V-0 *** thermogravimetric analyses revealed that char yield rose in presence of GNSs to form thermally stable carbonaceous *** decomposition and pyrolysis products in gas phase were characterized by thermogravimetry-Fourier transform infrared spectroscopy(TG-FTIR),and the release of large amounts of phosphorus was detected in the gas *** evaluation of flame-retardant effect by cone calorimetry demonstrated that GNSs improved the protective-barrier effect of fire residue of EP/DiDOPO/*** latter was further confirmed by digital photography and scanning electron microscopy(SEM).Also,Raman spectroscopy showed that GNSs enhanced graphitization degree of the resin during ***,the combination of DiDOPO with GNSs provides an effective way for developing high-performance resins with improved flame retardancy.

关键词： Epoxyresin DOPO derivative GNS Flame retardancy

Progress in research on metal-based materials in stabilized Zn anodes

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Rare Metals 2024年第1期43卷 20-40页

作者： Le Li Shao-Feng Jia Ming-Hui Cao Yong-qiang Ji Heng-wei qiu Dan Zhang Shaanxi Key Laboratory of Industrial Automation School of Mechanical EngineeringShaanxi University of TechnologyHanzhong 723001China School of Electronic and Information Engineering Qingdao UniversityQingdao 266071China State Key Laboratory for Artifcial Microstructure and Mesoscopic Physics School of PhysicsPeking UniversityBeijing 100871China Department of Chemistry Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical BiologyTsinghua UniversityBeijing 100084China Shaanxi Key Laboratory of Catalysis School of Chemistry and Environment ScienceShaanxi University of TechnologyHanzhong 723001China

Aqueous zinc-ion batteries(ZIBs) combine the benefits of metallic Zn anodes with those of aqueous electrolytes and are well suited for large-scale energy storage because of their inherent high safety, cost-effectiveness, and eco-friendliness. Currently, the practical application of such batteries is hindered by the poor cycling performance of Zn anodes due to uncontrolled dendrite formation and severe side reactions, although recent reports suggest that these problems can be mitigated through the modification of Zn anodes with metal-based *** that the mechanisms of improving Zn deposition and the structural evolution of metal-based materials have not been systematically reviewed, we herein systematically overview the metal-based materials used to stabilize Zn anodes, starting with a brief summary of the anode working mechanism and the challenges faced by stabilized Zn anodes. Subsequently, the design principles of Zn anodes stabilized by metal-based materials and the related recent progress are reviewed, and the key challenges and perspectives for the future development of such Zn anodes are proposed.

关键词： Zinc-ion batteries(ZIBs) Zn anode Metalbased materials Alloying metal Stabilized Zn anodes

Fostering artificial societies using social learning and social control in parallel emergency management systems

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Frontiers of Computer Science 2012年第5期6卷 604-610页

作者： wei DUAN Xiaogang qiu Research Center of Military Computational Experiments and Parallel Systems Technology College of Mechatronics Engineering and AutomationNational University of Defense TechnologyChangsha 410073China

How can we foster and grow artificial societies so as to cause social properties to emerge that are logical, consistent with real societies, and are expected by design- ers？ We propose a framework for fostering artificial soci- eties using social learning mechanisms and social control ap- proaches. We present the application of fostering artificial so- cieties in parallel emergency management systems. Then we discuss social learning mechanisms in artificial societies, in- cluding observational learning, reinforcement learning, imi- tation learning, and advice-based learning. Furthermore, we discuss social control approaches, including social norms, social policies, social reputations, social commitments, and sanctions.

关键词： artificial societies social computing social learning social control agent-based simulation