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Acta Mechanica Sinica 2013年第1期29卷 73-84页

作者： y.-f. zhao X.-C. Shang E. Pan Dept. of.Civil Engineering University of Akron Dept. of.Applied Mechanics University of Science and Technology

In this paper, we derive the analy.ical solutions in a three-dimensional anisotropic magnetoelectroelastic bimaterial space subject to unif.rm extended dislocations and tractions within a horizontal circular area. By.virtue of.the Stroh f.rmalism and f.urier transf.rmation, the f.nal expression of.solutions in the phy.ical domain contains only.line integrals over [0, 2π] rather than inf.nite integrals. As the reduced cases, the half.space and homogeneous f.ll-space solutions can be directly.derived f.om the present solutions. Also, in terms of.material domains, the present solutions can be reduced to the piezoelectric, piezomagnetic, purely.elastic materials with dif.erent sy.metries of.material prop- erty. To carry.out numerical calculations, Gauss quadrature is adopted. In the numerical examples, the ef.ect of.dif.erent loading locations on the response at the interf.ce is analy.ed. It is shown that, when the magnetic traction or electric dislocation is applied, the phy.ical quantities on the interf.ce may.not decrease monotonically.as the loading area moves away.f.om the interf.ce. The distributions of.dif.erent in-plane phy.ical quantities on the upper and lower interf.ces under various extended horizontal loadings are compared and the dif.erences are discussed. The work presented in this paper can serve as benchmarks f.r f.ture numerical studies in related research f.elds.

关键词： Anisotropic bimaterial space. Magnetoelectroe- lastic Extended dislocations Extended tractions Circular loading Analy.ic solutions

New evidence f.r the epigenetic regulation of.skeletal stem cells

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Science Bulletin 2024年第13期69卷 2004-2006页

作者： Liming zhao Jun Xiao Charles K.f.Chan Institute f.r Stem Cell Biology.and Regenerative Medicine Stanford University School of MedicineStanford CA 94305USA Department of.Surgery Division of Plastic and Reconstructive SurgeryStanford University School of MedicineStanford CA 94305USA Department of.Orthopaedic Surgery Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China

Skeletal stem cells(SSCs)are crucial f.r skeletal development and regeneration,y.t the epigenetic regulation of.these cells remains poorly.*** studies have delineated the epigenetic landscape across the developmental trajectory.of.SSCs,highlighting the involvement of.Ptip in regulating SSC *** skeletal sy.tem undergoes dy.amic remodeling throughout *** stem cells(SSCs),residing within the skeleton and lineage-restricted,serve as a cellular reserve to f.ster development and maintain skeletal *** categorized within the broader mesenchy.al stromal/stem cells(MSCs).

关键词： skeletal involvement maintain

Connections Between Induction Generator Ef.ect and Open-loop Modal Proximity.to Cause Sub-sy.chronous Oscillations in Series-compensated Power Sy.tem

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CSEE Journal of.Power and Energy.Sy.tems 2024年第3期10卷 963-973页

作者： Wenjuan Du y.ng Wang H.f.Wang Tao zhao Tim Littler College of.Electrical Engineering Sichuan UniversityChengduChina School of.Electrical Engineering the Queen’s University of BelfastBelfastUK IEEE

The induction generator ef.ect(IGE)and the openloop modal proximity.OLMP)are two dif.erent reasons why.subsy.chronous oscillations(SSOs)in a series-compensated power sy.tem(SCPS)may.*** IGE attributes the growing SSOs to negative resistance,while the OLMP explains the SSO mechanism f.om the standpoint of.modal *** this paper,we investigate the connections between the IGE and the OLMP through equivalent RLC circuit and open-loop modal *** investigation is conducted f.r two ty.es of.seriescompensated power sy.tems where either a sy.chronous generator or a Df.G is connected at the sending *** investigation reveals the conditions,in which the IGE and the OLMP may.jointly.cause the growing SSOs,i.e.,both the IGE and the OLMP can explain why.the growing SSOs ***,the investigation indicates that the IGE and the OLMP may.be totally.irrelevant and lead to growing SSOs *** implies that it is possible that in a SCPS,the growing SSOs are only.due to the IGE,and the OLMP is non-existent,and vice ***,when the growing SSOs occurs in a SCPS,examination based on both the IGE and the OLMP should be caref.lly.conducted in order to f.nd if.the oscillatory.instability.is due to the IGE,or the OLMP,or both of.them.

关键词： Induction generator ef.ect open-loop modal proximity series compensation sub-sy.chronous oscillations

Modelling the brittle rock f.ilure by.the quaternion-based bonded-particle model in DEM

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Rock Mechanics Bulletin

Rock Mechanics Bulletin 2024年第2期3卷 87-95页

作者： Tao zhao Philip E.f.Collins Department of.Civil and Environmental Engineering Brunel University LondonLondonUB83PHUnited Kingdom

This paper presents an investigation of.brittle rock f.ilure by.the quaternion-based bonded-particle model in discrete element method(DEM).Unlike traditional approaches that utilize Euler angles or rotation matrices,this model employ. unit quaternions to represent the spatial rotations of.*** method simplif.es the rep-resentation of.3D rotations,providing a more intuitive f.amework f.r modelling complex interactions in granular *** numerical model was validated by.the uniaxial compression tests on rock,with good agreement with well-documented experimental data in terms of.the rock uniaxial compression strength(UCS)and f.ilure *** loading,the rock sample demonstrated a linear-elastic response at an axial strain of.smaller than 0.45%.However,as internal bond breakage accumulated,this linear relationship weakened,and the stress-strain curve began to deviate f.om its initial linear *** bond breakage and the overall def.rmation of.the rock were primarily.controlled by.the shear bonding *** UCS was achieved at an axial strain of.0.625%,at which point the internal shear bonding f.rce chains were predominantly.aligned *** brittle f.ilure occurred when the internal damage of.solids nucleated to f.rm an interconnected f.ilure plane,accompanied by.a sharp rise in the internal damage *** area of.f.ilure plane increased with the loading strain rate,gradually.transf.rming the f.ilure pattern f.om the local damage to a complete f.agmentation.

关键词： Brittle f.ilure Quaternion DEM bonded model Uniaxial compression test Rate dependent Internal damage

Enhanced stability.of.nitrogen-doped carbon-supported palladium cataly.t f.r oxidative carbony.ation of.phenol

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Chinese Journal of.Chemical Engineering 2024年第1期65卷 19-28页

作者： Xiaojing Liu Ruohan zhao Hao zhao Zhimiao Wang f.ng Li Wei Xue y.nji Wang Hebei Provincial Key.Laboratory.of.Green Chemical Technology.and High Ef.icient Energy.Saving School of Chemical Engineering and TechnologyHebei University of TechnologyTianjin 300130China Tianjin Key.Laboratory.of.Chemical Process Saf.ty Tianjin 300130China Hebei Industrial Technology.Research Institute of.Green Chemical Industry Huanghua 061100China

Enhancing the stability.of.supported noble metal cataly.ts emerges is a major challenge in both science and ***,a heterogeneous Pd cataly.t(Pd/NCf.was prepared by.supporting Pd ultraf.ne metal nanoparticles(NPs)on nitrogen-doped carbon;sy.thesized by.using f.27 as a stabilizer,as well as chitosan as a carbon and nitrogen *** Pd/NCf.cataly.t was ef.icient and recy.lable f.r oxidative carbony.ation of.phenol to dipheny. carbonate,exhibiting higher stability.than Pd/NC prepared without f.27 *** hy.rogen bond between chitosan(CTS)and f.27 was enhanced by.f.27,which anchored the N in the f.ee amino group,increasing the N content of.the carbon material and ensuring that the support could provide suf.icient N sites f.r the deposition of.Pd *** process helped to improve metal *** increased metal-support interaction,which limits the leaching and coarsening of.Pd NPs,improves the stability.of.the Pd/NCf.***,density.f.nctional theory.calculations indicated that py.idine N stabilized the Pd^(2+)species,signif.cantly.inhibiting the loss of.Pd^(2+)in Pd/NCf.during the reaction *** work provides a promising avenue towards enhancing the stability.of.nitrogen-doped carbon-supported metal cataly.ts.

关键词： Supported Pd cataly.t N-doped carbon Amphiphilic triblock copoly.er Py.idinic nitrogen Stability

Two Matrix Theorems Arising f.om Nilpotent Groups

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Algebra Colloquium 2024年第3期31卷 499-504页

作者： Jing zhao Heguo Liu School of.Mathematics and Statistics Hainan University Haikou 570228China

f.r a nilpotent group G without π-torsion,and x,y.∈ G,if.x^(n)=y.(n) f.r a T-number n,then x=y.if.x^(m)y.(n)=y.(n)x^(m) f.r n-numbers m,n,then xy.*** is a wellknown result in group *** this paper,we prove two analogous theorems on matrices,which have independence ***,let m be a given positive integer and A a complex square matrix satisf.0}ng that(i)all eigenvalues of.A are nonnegative,and(i)rank A^(2)=rank A;then A has a unique m-th root X with rank X^(2)=rank X,all eigenvalues of.X are nonnegative,and moreover there is a poly.omial f.λ)with X=f.A).In addition,let A and B be complex n×n matrices with all eigenvalues nonnegative,and rank A^(2)=rank A,rank B^(2)=rank B;then(i)A=B when A^(r)=B^(r) f.r some positive integer r,and(i)AB=BA when A^(s)B^(t)=B^(t)A^(s) f.r two positive integers s and t.

关键词： nilpotent group root matrix Chinese remainder theorem

A Lightweight, Searchable, and Controllable EMR Sharing Scheme

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Computers, Materials & Continua 2024年第4期79卷 1521-1538页

作者： Xiaohui y.ng Peiy.n zhao School of.Cy.er Security.and Computer Hebei UniversityBaoding071000China

Electronic medical records (EMR) f.cilitate the sharing of.medical data, but existing sharing schemes suf.er f.omprivacy.leakage and inef.iciency. This article proposes a lightweight, searchable, and controllable EMR sharingscheme, which employ. a large attribute domain and a linear secret sharing structure (LSSS), the computationaloverhead of.encry.tion and decry.tion reaches a lightweight constant level, and supports key.ord search andpolicy.hiding, which improves the high ef.iciency.of.medical data sharing. The dy.amic accumulator technology.s utilized to enable data owners to f.exibly.authorize or revoke the access rights of.data visitors to the datato achieve controllability.of.the data. Meanwhile, the data is re-encry.ted by.Intel Sof.ware Guard Extensions(SGX) technology.to realize resistance to of.line dictionary.guessing attacks. In addition, blockchain technology.isutilized to achieve credible accountability.f.r abnormal behaviors in the sharing process. The experiments ref.ectthe obvious advantages of.the scheme in terms of.encry.tion and decry.tion computation overhead and storageoverhead, and theoretically.prove the security.and controllability.in the sharing process, providing a f.asible solutionf.r the saf. and ef.icient sharing of.EMR.

关键词： Lightweight key.ord search large attribute domain controllability blockchain

Investigation of.the epidemiology.pathogenicity.and immunogenicity.of.Bordetella bronchiseptica isolated f.om cats and dogs in China f.om 2021 to 2023

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Animal Diseases 2024年第3期4卷 156-172页

作者： Qinghua Shang Wenhui Gao Xiangting Zhang Jianqing zhao y.ng Wu Haoqi Li Ming Zhou Zhen f.f. Chengguang Zhang Ling zhao National Key.Laboratory.of.Agricultural Microbiology Huazhong AgriculturalUniversityWuhan 430070China. Key.Laboratory.of.Preventive Veterinary.edicine of.Hubei Province College of Veterinary MedicineHuazhongAgricultural UniversityWuhan 430070China. Hubei Hongshan Laboratory Wuhan 430070China.

Bordetella bronchiseptica(Bb)is recognized as a leading cause of.respiratory.diseases in dogs and ***,epidemiological data on Bb in dogs and cats in China are still limited,and there is no commercially.available *** vaccines containing Bb that are widely.used abroad are generally.ef.ctive but can establish latency.and potentially.reactivate to cause illness in some immunodef.ient vaccinated recipients,raising saf.ty.*** this study.34 canine-derived and two f.line-derived Bb strains were isolated f.om 1809 canine and 113 f.line nasophary.geal swab samples collected f.om eight provinces in China f.om 2021 to *** PCR results showed that the percentage of.positive Bb was 22.94%(441/1922),and more than 90%of.the Bb isolates had f.ur virulence f.ctor-encoding genes(Vf.s),namely.f.aB,prn,betA and *** the isolated strains display.d a multidrug-resistant *** virulence of.10 Bb strains isolated f.om dogs with respiratory.sy.ptoms was tested in mice,and we f.und that eight isolates were highly.***,the eight Bb isolates with high virulence were inactivated and intramuscularly.injected into mice,and three Bb strains(WH1218,WH1203 and WH1224)with the best protective ef.acy.were *** immunized with these three strains exhibited strong protection against challenge with the Bb f.ld strain ***,the WH1218 strain with the greatest protection in dogs was selected as the vaccine *** and cats that received a vaccine containing 109 Cf. of.the inactivated WH1218 strain showed complete protection against challenge with the Bb f.ld strain *** study.revealed that Bb is an important pathogen that causes respiratory.diseases in domestic dogs and cats in China,and all the isolates exhibited multidrug *** present work contributes to the current understanding of.the prevalence,antimicrobial resistance,and virulence genes of.Bb in domestic dogs and ***,our results suggest

关键词： Bordetella bronchiseptica Epidemiological investigation Pathogenicity Immunogenicity Inactivated vaccine

Self.attention Guidance Based Crowd Localization and Counting

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Machine Intelligence Research 2024年第5期21卷 966-982页

作者： Zhouzhou Ma Guanghua Gu Wenrui zhao School of.Inf.rmation Science and Engineering Yanshan UniversityQinhuangdao066000China Hebei Key.Laboratory.of.Inf.rmation Transmission and Signal Processing Qinhuangdao066000China

Most existing studies on crowd analy.is are limited to the level of.counting,which cannot provide the exact location of.*** paper proposes a self.attention guidance based crowd localization and counting network(SA-CLCN),which can simultaneously.locate and count *** take the f.rm of.object detection,using the original point annotations of.crowd datasets as supervision to train the ***,the center point coordinate of.each head as well as the number of.crowds are ***,to cope with the spatial and positional variations of.the crowd,the proposed method introduces transf.rmer to construct a globallocal f.ature extractor(GLf.)together with the convolutional *** establishes the near-to-f.r dependency.between elements so that the global context and local detail f.atures of.the crowd image can be extracted ***,this paper designs a py.amid f.ature f.sion module(Pf.M)to f.se the global and local inf.rmation f.om high level to low level to obtain a multiscale f.ature *** downstream tasks,this paper predicts candidate point of.sets and conf.dence scores by.a simple regression header and classif.cation *** addition,the Hungarian algorithm is used to match the predicted point set and the labelled point set to f.cilitate the calculation of.*** proposed network avoids the errors or higher costs associated with using traditional density.maps or bounding box ***,we have conducted extensive experiments on several crowd datasets,and the proposed method has produced competitive results in both counting and localization.

关键词： Crowd localization crowd counting transf.rmer point supervision object detection

Attractor f.r the Extensible Beam Equation with Nonlocal Weak Damping on Time–Dependent Space

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Acta Mathematica Sinica,English Series 2024年第4期40卷 1115-1126页

作者： Chun Xiang zhao f.ng Juan MENG Institute of.Applied Sy.tem Analy.is Jiangsu UniversityZhenjiang 212013P.R.China School of.Mathematics and Phy.ics Jiangsu University of TechnologyChangzhou 213001P.R.China

In this article,we consider the long-time behavior of.extensible beams with nonlocal weak damping:ε(t)u_(tt)+Δ^(2)u-m(‖▽u‖^(2))Δu+‖u_(t)‖^(p_(u_(t)))+f.u)=h,whereε(t)is a decreasing f.nction vanishing at *** the theory.of.process on time-dependent spaces,we investigate the existence of.the time-dependent attractor by.using the Condition(C_(t))method and more detailed *** results obtained essentially.improve and complete some previous works.

关键词： Time-dependent attractor extensible beams equation nonlocal weak damping