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Damage evolution analysis of SRM under compression using X-ray tomography and numerical simulation

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Damage evolution analysis of SRM under compression using X-r...

中国科学院地质与地球物理研究所2015年度（第15届）学术年会

作者： y.Wang X.Li y.f.wu Key Laboratory of Engineering Geomechanics Institute of Geology and GeophysicsChinese Academy of Science

The soil-rock mixture(SRM)is a special inhomogeneous multiphase geomaterial,the study of the SRM’s damage characteristic is crucial to the stability of *** paper explores the use of high-resolution X-ray tomography and Realistic failure Process Analysis code(RfPA2)to identify the damage mechanism and the cracking process of SRM during compressive loading.X-ray tomography images were used to extract defects of SRM specimen under different compressive loadings,also damage characteristics of region of interest(ROI)were analysed by X-ray *** simulation was conducted to describe the damage characteristics with damage element number(DEN)recorded during *** show that X-ray tomography and numerical simulation based on RfPAare complementary good methods to research the damage evolution of *** characteristics of SRM are progressive;cracking begins from rock—soil jointed interfaces,and then propagates into soil matrix,and the growth of crack-shear band and macro-pore finally result in the failure of SRM.

关键词： Soil-rock mixture(SRM) damage evolution X-ray tomography numerical simulation damage element number(DEN)

Parameter-free Shifted Laplacian Reconstruction for Multiple Kernel Clustering

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IEEE/CAA Journal of Automatica Sinica 2024年第4期11卷 1072-1074页

作者： Xi wu Zhenwen Ren f.Richard yu the School of National Defence Science and Technology Southwest University of Science and TechnologyMianyang 621010China the School of National Defence Science and Technology Southwest University of Science and TechnologyMianyang 621010 the Guangxi Key Laboratory of Machine Vision and Intelligent Control Wuzhou UniversityWuzhou 543002 the Guangdong Laboratory of Artificial Intelligence and Digital Economy(SZ) Shenzhen 518060China

Dear Editor,This letter proposes a parameter-free multiple kernel clustering(MKC)method by using shifted Laplacian *** MKC can effectively cluster nonlinear data,but it faces two main challenges:1)As an unsupervised method,it is up against parameter problems which makes the parameters intractable to tune and is unfeasible in real-life applications;2)Only considers the clustering information,but ignores the interference of noise within Laplacian.

关键词： parameter letter Parameter

Simplified p-norm-like Constraint LMS Algorithm for Efficient Estimation of Underwater Acoustic Channels

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Journal of Marine Science and Application 2013年第2期12卷 228-234页

作者： f.y. wu y.H. Zhou f. Tong R. Kastner Key Laboratory of Underwater Acoustic Communication and Marine Information Technology of the Minister of Education Xiamen University Xiamen 361005 China Department of Computer Science and Engineering University of California San Diego La Jolla USA

Underwater acoustic channels are recognized for being one of the most difficult propagation media due to considerable difficulties such as： multipath, ambient noise, time-frequency selective fading. The exploitation of sparsity contained in underwater acoustic channels provides a potential solution to improve the performance of underwater acoustic channel estimation. Compared with the classic 10 and 11 norm constraint LMS algorithms, the p-norm-like （Ip） constraint LMS algorithm proposed in our previous investigation exhibits better sparsity exploitation performance at the presence of channel variations, as it enables the adaptability to the sparseness by tuning of p parameter. However, the decimal exponential calculation associated with the p-norm-like constraint LMS algorithm poses considerable limitations in practical application. In this paper, a simplified variant of the p-norm-like constraint LMS was proposed with the employment of Newton iteration m to approximate the decimal exponential calculation. Num simulations and the experimental results obtained in physical shallow water channels demonstrate the effectiveness of the proposed method compared to traditional norm constraint LMS algorithms.

关键词： p-norm-like constraint tmderwater acoustic channels LMS algorithm sparsity exploitation

Superconducting anisotropy and vortex pinning in CaKfe_(4)As_(4) and KCa_(2)fe_(4)As4f_(2)

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Chinese Physics B 2021年第2期30卷 131-137页

作者： A B yu Z Huang C Zhang y f wu T Wang T Xie C Liu H Li W Peng H Q Luo G Mu H Xiao L X you T Hu State Key Laboratory of functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Beijing Academy of Quantum Information Sciences Beijing 100193China Center for High Pressure Science and Technology Advanced Research Beijing 100094China CAS Center for Excellence in Superconducting Electronics(CENSE) Shanghai 200050China University of Chinese Academy of Sciences Beijing 100049China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China

The vortex pinning determining the current carrying capacity of a superconductor is an important property to the applications of superconducting *** layered superconductors,the vortex pinning can be enhanced by a strong interlayer interaction in accompany with a suppression of superconducting anisotropy,which remains to be investigated in iron based superconductors(feSCs)with the layered ***,based on the transport and magnetic torque measurements,we experimentally investigate the vortex pinning in two bilayer feSCs,CaKfe_(4)As_(4)(fe1144)and KCa_(2)fe_(4)As4f_(2)(fe12442),and compare their superconducting anisotropyγ.While the anisotropyγ≈3 for fe1144 is much smaller thanγ≈15 in fe12442 around Tc,a higher flux pinning energy as evidenced by a higher critical current density is found in fe1144,as compared with the case of *** combination with the literature data of Ba_(0.72)K_(0.28)fe2As_(2) and Nd fe As_(O0.82)f_(0.18),we reveal an anti-correlation between the pinning energy and the superconducting anisotropy in these fe *** results thus suggest that the interlayer interaction can not be neglected when considering the vortex pinning in fe SCs.

关键词： iron based superconductors vortex pinning anisotropy

Experimental study on meso-damage cracking characteristics of RSA by CT test

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Experimental study on meso-damage cracking characteristics o...

中国科学院地质与地球物理研究所2015年度（第15届）学术年会

作者： y.Wang X.Li y.f.wu C.Lin B.Zhang Key Laboratory of Shale Gas and Geoengineering Institute of Geology and GeophysicsChinese Academy of Sciences

This paper investigates the meso-damage mechanism and the cracking characteristics of rock and soil aggregate(RSA)by X-ray computed tomography(CT)under uniaxial compressive *** RSA specimens(50 mm diameter and 100 mm height)with rock percentage 40%were produced to perform a series of uniaxial compressive strength *** damage cracking characteristic is identified by the mean CT value,and also the meso-damage propagation law is analyzed based on the damage factor defined by the CT *** the test results,the variation of CT value for region of interest is different at the same stress level,the mean CT value for the RSA specimen,and rock block inclusions,and their adjacent soil regions decrease with the increasing stress *** is more sensitive for block inclusions than soil ***,the meso-damage evolution equation and constitutive equation for RSA are *** estimated result is in agreement with the measured ***,based on the image threshold segmentation method,length,area,and mean width of cracks obey to power function *** statistical characteristics are closely related to the rock block’s distribution and *** results confirm that the elastic mismatch of RSA is the primary reason resulting in cracking under loading,damage characteristics of RSA is progressive,cracking begins from rock-soil interfaces,and then propagate into soil matrix.

关键词： Rock and soil aggregate(RSA) X-ray tomography CT value Meso-damage mechanism Cracking evolution

Effect of Gd on the Microstructure and Mechanical Properties of Mg-Sn-Zn-Al Alloy

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Effect of Gd on the Microstructure and Mechanical Properties...

International Conference on Electrical Information and Mechatronics(ICEIM2012)

作者： C.f.fang L.G.Meng y.f.wu L.H.Wang X.G.Zhang School of Materials Science and Engineering Dalian University of Technology

The effect of Gd addition on the microstructures and mechanical properties of Mg-5Sn-Zn-Al alloy was investigated with variations of Gd contents. These results show that adding Gd can effectively refine the grain size and growthIn addition, the solubility of Gd increases the lattice constants of α-Mg phaseAccordingly, the tensile properties of the as-cast Mg-5Sn-Zn-Al alloy are improved by the addition of Gd. The Mg-5Sn-Zn-Al-0.4Gd exhibits the highest tensile properties, and the values of the yield and ultimate tensile strength and elongation are 111 MPa, 188 MPa and 18.0%, respectively.

关键词： Magnesium alloy Gadolinium Mg-Sn-Zn-Al Microstructure Mechanical properties

On equivalence of state-based potential games

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Science China(Information Sciences) 2024年第6期67卷 313-327页

作者： Han wu Jinhuan WANG Institute of Mathematics School of ScienceHebei University of Technology

In this paper, we explore state-based potential games using the semi-tensor product of ***, applying the potential equation, we derive both a necessary and sufficient condition as well as a sufficient condition to verify whether a state-based game qualifies as a potential game. Next, we present two static equivalence conditions of state-based potential games. We then delve into dynamic equivalence. We propose a criterion that allows us to identify state-based games that are dynamically equivalent to state-based potential games and share similar dynamic properties. Ultimately, we introduce the concept of state-based networked evolutionary games. We provide a necessary and sufficient condition to ensure that a state-based networked evolutionary game can be classified as a state-based potential game.

关键词： semi-tensor product of matrices state-based potential game verification equivalence state-based networked evolutionary game

The functional Redundancy of Neddylation E2s and E3s in Modulating the fitness of Regulatory T Cells

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Research 2024年第2期2023卷 373-387页

作者： Di wu yi Sun Cancer Institute(Key Laboratory of Cancer Prevention and Intervention China National Ministry of Education)of the Second Affiliated Hospital and Institute of Translational MedicineZhejiang University School of MedicineHangzhou 310029China Cancer Center of Zhejiang University Hangzhou 310029China Zhejang Provincial Clinical Research Center for Cancer Zhejang ProvinceChina Key Laboratory of Molecular Biology in Medical Sciences Zhejang ProvinceChina Research Center for Life Science and Human Health Binjiang Institute of Zhejiang UniversityHangzhou 310053China

Neddylation is necessary for activation of Cullin-RING ligases(CRLs),which degrade various immune regulatory *** recent study showed that while depletion of neddylation E2-E3 pair Ube2f-Sag in regulatory T(T_(reg))cells had no obvious phenotype,the same depletion of either Ube2m or Rbx1 caused inflammation disorders with different *** these E2s or E3s compensate each other in functional regulations of T_(reg)cells is,however,previously *** this report,we generated foxp3^(Cre);Ube2m^(fl/fl);Ube2f^(fl/fl)or foxp3^(Cre);Rbx1^(fl/fl);Sag^(fl/fl)double-null mice by simultaneous deletion of both neddylation E2s or E3s in T_(reg)cells,***,Ube2m&Ube2f double-null mice developed much severe autoimmune phenotypes than did Ube2m-null mice,indicating that Ube2m markedly compensates Ube2f in T_(reg)*** minor worsened autoimmune phenotypes seen at the very early stage in Rbx1&Sag double-null than Rbx1-null mice is likely due to already severe phenotypes of the later,indicating a minor compensation of Rbx1 for *** RNA profiling-based analyses revealed that up-and down-regulations of few signaling pathways in T_(reg)cells are associated with the severity of autoimmune ***,severer inflammation phenotypes seen in mice with double E3-null than with double E2-null T_(reg)cells indicate a neddylation-independent mechanism of 2 E3s,also known to serve as the RING component of CRLs in regulation of T_(reg)cell fitness.

关键词： foxp3 inflammation markedly

Evolutionary history shapes variation of wood density of tree species across the world

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Plant Diversity 2024年第3期46卷 283-293页

作者： fangbing Li Hong Qian Jordi Sardans Dzhamal y.Amishev Zixuan Wang Changyue Zhang Tonggui wu Xiaoniu Xu Xiao Tao Xingzhao Huang Anhui Province Key Laboratory of forest Resources and Silviculture Anhui Agricultural UniversityHefei 230036China State Key Laboratory of Subtropical Silviculture Zhejiang A&F UniversityHangzhou 311300China Research and Collections Center Illinois State Museum1011 East Ash StreetSpringfieldIL 62703USA CREAf Cerdanyola del VallesBarcelona 08193Spain Global Ecology Unit CREAf-CSIC-UAB CSICBellaterraBarcelona 08193Spain Key Laboratory of Ecosystem Carbon Source and Sink China Meteorological Administration(ECSS-CMA)School of Applied MeteorologyNanjing University of Information Science&Technology219 Ningliu RoadNanjing 210044China Department of Natural Resources Management Lakehead UniversityThunder BayOntario P7B 5E1Canada School of forestry&Landscape of Architecture Anhui Agricultural UniversityHefei 230036China Research Institute of Subtropical forestry Chinese Academy of ForestryHangzhou 311400China

The effect of evolutionary history on wood density variation may play an important role in shaping variation in wood density,but this has largely not been *** a comprehensive global dataset including 27,297 measurements of wood density from 2621 tree species worldwide,we test the hypothesis that the legacy of evolutionary history plays an important role in driving the variation of wood density among tree *** assessed phylogenetic signal in different taxonomic(e.g.,angiosperms and gymnosperms)and ecological(e.g.,tropical,temperate,and boreal)groups of tree species,explored the biogeographical and phylogenetic patterns of wood density,and quantified the relative importance of current environmental factors(e.g.,climatic and soil variables)and evolutionary history(i.e.,phylogenetic relatedness among species and lineages)in driving global wood density *** found that wood density displayed a significant phylogenetic *** density differed among different biomes and climatic zones,with higher mean values of wood density in relatively drier regions(highest in subtropical desert).Our study revealed that at a global scale,for angiosperms and gymnosperms combined,phylogeny and species(representing the variance explained by taxonomy and not direct explained by long-term evolution process)explained 84.3%and 7.7%of total wood density variation,respectively,whereas current environment explained 2.7%of total wood density variation when phylogeny and species were taken into *** angiosperms and gymnosperms were considered separately,the three proportions of explained variation are,respectively,84.2%,7.5%and 6.7%for angiosperms,and 45.7%,21.3%and 18.6%for *** study shows that evolutionary history outpaced current environmental factors in shaping global variation in wood density.

关键词： Wood density Phylogeny Angiosperms Gymnosperms Climate factors Biophysical parameters