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Coherent coupling between vibrational modes of C-H bonds at different positions studied by femtosecond time-resolved coherent anti-Stokes Raman scattering 认领 引用 被引量：2
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作者 杜鑫 何兴 +2 位作者 刘玉强 王英惠 杨延强 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第3期248-251,共4页
We performed femtosecond time-resolved coherent anti-Stokes Raman scattering （fs-CARS） measurements on liquid toluene and PVK film. For both samples, we selectively excited the CH stretching vibrational modes and ob... We performed femtosecond time-resolved coherent anti-Stokes Raman scattering （fs-CARS） measurements on liquid toluene and PVK film. For both samples, we selectively excited the CH stretching vibrational modes and observed the expected quantum beat signals. The frequency of the well-defined beats is in good agreement with the energy difference between the two simultaneously excited modes, which demonstrates that a coherent coupling between the vibrational modes of the C H chemical bonds exists at the different positions of the molecules. The dephasing times of the excited modes are obtained simultaneously. 展开更多
关键词 femtosecond time-resolved coherent anti-Stokes Raman scattering coherent coupling quantum beat
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FEM analyses for influences of stress-chemical solution on THM coupling in dual-porosity rock mass 认领 引用 被引量：3
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作者 张玉军 杨朝帅 《Journal of Central South University》 SCIE EI CAS 2012年第4期1138-1147,共10页
The models of stress corrosion, pressure solution and flee-face dissolution/precipitation were introduced. Taking a hypothetical nuclear waste repository in an unsaturated dual-porosity rock mass as the calculation ob... The models of stress corrosion, pressure solution and flee-face dissolution/precipitation were introduced. Taking a hypothetical nuclear waste repository in an unsaturated dual-porosity rock mass as the calculation objective, four cases were designed 1） the fracture aperture is a function of stress corrosion, pressure solution and free-face dissolution/precipitation; 2） the fracture aperture changes with stress corrosion and pressure solution; 3） the fracture aperture changes with pressure solution and free-face dissolution/precipitation; 4） the fracture aperture is only a function of pressure solution, and the matrix porosity is also a function of stress in these four cases. Then, the corresponding two-dimensional FEM analyses for the coupled thermo-hydro-mechanical processes were carried out. The results show that the effects of stress corrosion are more prominent than those of pressure solution and free-face dissolution/precipitation, and the fracture aperture and relevant permeability caused by the stress corrosion arc only about 1/5 and 1/1000 of the corresponding values created by the pressure solution and free-face dissolution/precipitation, respectively Under the action of temperature field from released heat, the negative pore and fracture pressures in the computation domain rise continuously, and are inversely proportional to the sealing of fracture aperture. The vector fields of flow velocity of fracture water in the cases with and without considering stress corrosion are obviously different. The differences between the magnitudes and distributions of stresses within the rock mass are very small in all cases. 展开更多
关键词 stress corrosion pressure solution flee-face dissolution/precipitation dual-porosity medium thermo-hydro-mechanicalcoupling FEM analysis
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FEM analyses for influences of pressure solution on thermo-hydro-mechanical coupling in porous rock mass 认领 引用
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作者 张玉军 杨朝帅 《Journal of Central South University》 SCIE EI CAS 2012年第8期2333-2339,共7页
The model of pressure solution for granular aggregate was introduced into the FEM code for analysis of thermo-hydro- mechanical （T-H-M） coupling in porous medium. Aiming at a hypothetical nuclear waste repository in... The model of pressure solution for granular aggregate was introduced into the FEM code for analysis of thermo-hydro- mechanical （T-H-M） coupling in porous medium. Aiming at a hypothetical nuclear waste repository in an unsaturated quartz rock mass, two computation conditions were designed： 1） the porosity and the permeability of rock mass are fimctions of pressure solution; 2） the porosity and the permeability are constants. Then the corresponding numerical simulations for a disposal period of 4 a were carried out, and the states of temperatures, porosities and permeabilities, pore pressures, flow velocities and stresses in the rock mass were investigated. The results show that at the end of the calculation in Case 1, pressure solution makes the porosities and the permeabilities decrease to 10%-45% and 0.05%-1.4% of their initial values, respectively. Under the action of the release heat of nuclear waste, the negative pore pressures both in Case 1 and Case 2 are 1.2-1.4 and 1.01-l.06 times of the initial values, respectively. So, the former represents an obvious effect of pressure solution. The magnitudes and distributions of stresses within the rock mass in the two calculation cases are the same. 展开更多
关键词 pressure solution porous medium thermo-hydro-mechanical coupling FEM analysis
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Numerical Simulation of the Seismic Response of a Horizontal Storage Tank Based on a SPH-FEM Coupling Method 认领 引用
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作者 Peilei Yan Endong Guo +1 位作者 HouliWu Liangchao Zhang 《Computer Modeling in Engineering & Sciences》 SCIE EI 2024年第5期1655-1678,共24页
A coupled numerical calculation method combining smooth particle hydrodynamics(SPH)and the finite element method(FEM)was implemented to investigate the seismic response of horizontal storage tanks.Anumericalmodel of a... A coupled numerical calculation method combining smooth particle hydrodynamics(SPH)and the finite element method(FEM)was implemented to investigate the seismic response of horizontal storage tanks.Anumericalmodel of a horizontal storage tank featuring a free liquid surface under seismic action was constructed using the SPH–FEM coupling method.The stored liquid was discretized using SPH particles,while the tank and supports were discretized using the FEM.The interaction between the stored liquid and the tank was simulated by using the meshless particle contact method.Then,the numerical simulation results were compared and analyzed against seismic simulation shaking table test data to validate the method.Subsequently,a series of numerical models,considering different liquid storage volumes and seismic effects,were constructed to obtain time history data of base shear and top center displacement,which revealed the seismic performance of horizontal storage tanks.Numerical simulation results and experimental data showed good agreement,with an error rate of less than 18.85%.And this conformity signifies the rationality of the SPH-FEM coupling method.The base shear and top center displacement values obtained by the coupled SPH-FEM method were only 53.3% to 69.1% of those calculated by the equivalent mass method employed in the current code.As the stored liquid volume increased,the seismic response of the horizontal storage tank exhibited a gradual upward trend,with the seismic response increasing from 73% to 388% for every 35% increase in stored liquid volume.The maximum von Mises stress of the tank and the supports remained below the steel yield strength during the earthquake.The coupled SPH-FEM method holds certain advantages in studying the seismic problems of tanks with complex structural forms,particularly due to the representation of the flow field distribution during earthquakes by involving reservoir fluid participation. 展开更多
关键词 SPH-FEM coupling method horizontal storage tank seismic response sloshing
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Numerical simulation of a sheet metal extrusion process by using thermal-mechanical coupling EAS FEM 认领 引用 被引量：2
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作者 ZhanghuaChen T.C.Lee 《Journal of University of Science and Technology Beijing》 2002年第5期378-382,共5页
The thermal-mechanical coupling finite element method(FEM)was usedto simulate a non-isothermal sheet metal extrusion process. On thebasis of the finite plasticity consistent with multiplicativedecomposition of the def... The thermal-mechanical coupling finite element method(FEM)was usedto simulate a non-isothermal sheet metal extrusion process. On thebasis of the finite plasticity consistent with multiplicativedecomposition of the deformation gradient, the enhanced as- sumedstrain(EAS)FEM was applied to carry out the numerical simulation. Inorder to make the computation reliable ad avoid hour- glass mode inthe EAS element under large compressive strains, an alterative formof the original enhanced deformation gradient was employed. Inaddition, reduced factors were used in the computation of the elementlocal internal parameters and the enhanced part of elementalstiffness. 展开更多
关键词 enhanced assumed strain element thermal-mechanical coupling process houyrglass mode
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FEM COUPLING FIELD ITERATION AND ITS CONVERGENCE FOR A GMM ACTURATOR 认领 引用 被引量：2
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作者 CaoZhiton CaiJiongjiong ChenHongping HeGuoguang 《Chinese Journal of Mechanical Engineering》 EI CAS 2005年第1期79-82,共4页
The coupling iteration (CI) of the finite element method(FEM) is used to simulate the magnetic and mechanical characteristics for a GMM actuator. The convergent ability under different prestress and different load typ... The coupling iteration (CI) of the finite element method(FEM) is used to simulate the magnetic and mechanical characteristics for a GMM actuator. The convergent ability under different prestress and different load types is investigated. Then the calculated deformations are compared with the experimental values. The results convince that the CI of FEM is suitable for the simulation of energy coupling and transformation mechanism of the GMM. At last, the output deformation properties are studied under different input currents, showing that there is a good compromise between good linearity and large strain under the prestress 6 MPa. 展开更多
关键词 Giant magnetostrictive materials(GMM) Energy coupling and transformation Coupling iteration (CI) Finite element method (FEM) Actuator
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Nonlinear coupling mechanism of quasi-zero-stiffness units in multi-level structures 认领 引用
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作者 Shaokun YANG Xingxing SHI +2 位作者 Xingzhong WANG Jiuhui WU Fuyin MA 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2026年第6期1215-1240,共26页
Multilayer structures composed of quasi-zero-stiffness(QZS)units exhibit mechanical characteristics distinct from those of a single unit,and their behaviors are governed by the coupling mechanism between the QZS units... Multilayer structures composed of quasi-zero-stiffness(QZS)units exhibit mechanical characteristics distinct from those of a single unit,and their behaviors are governed by the coupling mechanism between the QZS units.This paper introduces the coupling coefficient to quantitatively describe this mechanism,classifying the system into strongly coupled and weakly coupled states.Through theoretical analysis,numerical simulation,and experimental testing,the static and dynamic responses under different coupling states are comparatively investigated.The results show that in the strongly coupled system,the deformation behavior of each QZS unit shows high consistency,leading to a wider QZS region,weaker nonlinear characteristics,and stronger dynamic response.In the weakly coupled systems,the low degree of deformation coordinations among the units results in different QZS regions,enabling low-frequency vibration isolation under varying loads.The analytical approach of the coupling mechanisms and the static and dynamic response behaviors generated by the two coupling mechanisms provide guidance for the structural design of multifunctional and highly adaptable multi-level QZS metamaterials. 展开更多
关键词 multi-level structure coupling mechanism strong coupling weak coupling deformation coordination
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FEM-BEM Coupling for the MHD Pipe Flow in an Exterior Region 认领 引用
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作者 S. Han Aydin 《Open Journal of Fluid Dynamics》 2013年第3期184-190,共7页
In this study, the magnetohydrodynamic (MHD) flow through a circular pipe under the influence of a transverse mag- netic field when the outside medium is also electrically conducting is solved numerically by using FEM... In this study, the magnetohydrodynamic (MHD) flow through a circular pipe under the influence of a transverse mag- netic field when the outside medium is also electrically conducting is solved numerically by using FEM-BEM coupling approach. The coupled partial differential equations defined for the interior medium are transformed into homogenous modified Helmholtz equations. For the exterior medium on an infinite region, the Laplace equation is considered for the exterior magnetic field. Unknowns in the equations are also related with the corresponding Dirichlet and Neumann type coupled boundary conditions. Unknown values of the magnetic field on the boundary and for the exterior region are obtained by using BEM, and the unknown velocity and magnetic field inside the pipe are obtained by using SUPG type stabilized FEM. Computations are carried for very high values of magnetic Reynolds numbers Rm1, Reynolds number Re and magnetic pressure Rh of the fluid. The results show that using stabilized method enables us to get stable and accurate numerical approximations consistent with the physical configuration of the problem over rough mesh which also results a cheap computational cost. 展开更多
关键词 FEM-BEM Coupling SUPG MHD Pipe Flow
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Coupling Development Between Digital Economy–Agriculture Integration and Rural Revitalization in China:Spatiotemporal Disparities and Evolution Trends 认领 引用
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作者 Peng Xiangjun Jia Qingsong 《Contemporary Social Sciences》 2026年第1期71-89,共19页
This study aims to promote the optimization and upgrading of the economic structure in rural areas of China by focusing on the coupling coordination mechanism between digital economy–agriculture integration and rural... This study aims to promote the optimization and upgrading of the economic structure in rural areas of China by focusing on the coupling coordination mechanism between digital economy–agriculture integration and rural revitalization.By examining panel data from 30 Chinese provinces,autonomous regions,and municipalities between 2011 and 2022,the research constructs a weight-based evaluation system that integrates subjective and objective methods and a coupling coordination model to reveal its dynamic evolution patterns.Key findings indicate that digital economy–agriculture integration and rural revitalization achieve cross-coupling through critical activities.The impact of digital-agriculture integration on advancing rural revitalization lags by 2–3 years.Although the coupling development degree between the two systems continues to improve,it remains at the stage of primary coordination.Regional disparities are significant,showing a gradient pattern of“high degree of coupling development in the east and low degree of coupling development in the west.” 展开更多
关键词 digital economy-agriculture integration rural revitalization coupling coordination coupling development
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The context dependency of nitrogen deposition impacts on the compositional coupling between aboveground vegetation and soil seed bank 认领 引用 被引量：1
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作者 Niwu Te Wen-Tao Luo +6 位作者 Péter Török Xiao-Ru Zhang Xiao-Sa Liang Yuan-Xiu Wu Xiao-Jing Zhang Anke Jentsch Xiao-Tao Lü 《Plant Diversity》 SCIE CAS CSCD 2026年第2期373-380,共8页
The compositional coupling between aboveground vegetation and soil seed bank is critical for community stability and successional trajectories,but such relationships are highly sensitive to environmental changes.Altho... The compositional coupling between aboveground vegetation and soil seed bank is critical for community stability and successional trajectories,but such relationships are highly sensitive to environmental changes.Although nitrogen(N)deposition has been reported to decouple the associations between aboveground vegetation and the soil seed bank in grasslands,it remains unclear whether and how grassland management practices,such as mowing,mediate N deposition effects.We evaluated the impacts of N input and mowing on the diversity and composition of the aboveground vegetation and soil seed bank,as well as their compositional coupling in a decadal grassland experiment.N addition increased the compositional dissimilarity between the soil seed bank and aboveground vegetation by increasing abundance gradient,but only in unmown plots.N addition did not affect the compositional dissimilarity between aboveground vegetation and the soil seed bank in mown plots.Mowing increased the graminoid abundance in the aboveground vegetation,but increased the forb abundance in the soil seed bank,and thus increased the compositional dissimilarity between aboveground vegetation and the soil seed bank by promoting balanced variation in abundance.Our results reveal the importance of context dependence in the consequences of N inputs on the compositional coupling between aboveground vegetation and the soil seed bank in grasslands.The land-use context should be fully considered when evaluating the impacts of global change drivers on grassland community dynamics and succession. 展开更多
关键词 Compositional coupling Grassland management Hay harvest Nitrogen enrichment Soil seed bank Temperate steppe
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Strain-Tunable Interlayer Magnetic Coupling in van der Waals Ferromagnet Fe3GaTe2Nanoflakes 认领 引用
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作者 Sinan Liu Chuandi Pan +10 位作者 Chunsheng Wang Hengning Wang Dongna Feng Gaojie Zhang Hao Wu Haixin Chang Huanhuan Zhang Jin Tang Qilong Sun Guolin Zheng Mingliang Tian 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第4期271-279,共9页
Interlayer magnetic coupling plays vital roles in the physical properties of van der Waals(vd W)magnets and in engineering functionally optimized spintronics.So far,however,few avenues are available to control the mag... Interlayer magnetic coupling plays vital roles in the physical properties of van der Waals(vd W)magnets and in engineering functionally optimized spintronics.So far,however,few avenues are available to control the magnetic coupling at interfaces. 展开更多
关键词 interfaces Fe Ga nanoflakes van der waals ferromagnet functionally optimized spintronicsso strain tunable interlayer magnetic coupling control magnetic coupling
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Three-dimensional magnetotelluric forward modeling using structural-point EFGM and FEM coupling method 认领 引用
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作者 CAO Jin LIU Yunhe 《Global Geology》 2022年第1期1-10,共10页
In this paper,the authors propose a method of three-dimensional(3D)magnetotelluric(MT)forward modeling algorithm based on the meshfree and finite element coupling method.The model is discretized by regular nodes in th... In this paper,the authors propose a method of three-dimensional(3D)magnetotelluric(MT)forward modeling algorithm based on the meshfree and finite element coupling method.The model is discretized by regular nodes in the central area,and the radial point interpolation method(RPIM)based on the global weakness is utilized to construct the meshfree shape function.The Governing equations in each background gird are solved by Gaussian integration.In the extended area where the points are sparsely distributed,to avoid the instability of the meshfree method,finite element method(FEM)with regular grids is used to solve the governing equation.Finally,the meshfree and finite element governing equations are coupled by the continuity of the field at the interfaces,and the direct solution technique is used to realize the 3D MT forward modeling.Numerical experiments of several typical electrical models are used to verify the effectiveness of the method. 展开更多
关键词 3D MT radial point interpolation method meshfree coupling
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Coupled FEM-DEM modeling of permeability evolution in rough fractured shale during shearing under varying confining pressures 认领 引用 被引量：2
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作者 Bin Li Qi Li 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第3期1736-1754,共19页
The dynamic evolution of fracture permeability presents a critical scientific challenge in rock masses.Understanding the mechanisms of rock mass permeability evolution is vital for engineering project design and opera... The dynamic evolution of fracture permeability presents a critical scientific challenge in rock masses.Understanding the mechanisms of rock mass permeability evolution is vital for engineering project design and operations.By integrating the discrete element method(DEM)with the finite element method(FEM),a numerical simulation framework for shear seepage in rough fractured shale has been developed to investigate the dynamic mechanisms of permeability evolution under varying confining pressures and during the shearing process.Numerical simulations were conducted on rough fractured samples under effective confining pressures ranging from 5 MPa to 20 MPa to monitor the aperture and permeability evolution of the fracture.The results of the numerical simulation are consistent with the experimental observations,indicating that both the shearing process and confining pressure significantly influence permeability.Moreover,the magnitude of the confining pressure is a crucial factor influencing the trend in permeability changes.Under a confining pressure of 5 MPa,fracture permeability initially increases significantly but decreases post-shearing.In contrast,a continuous decrease in fracture permeability is observed when the confining pressure exceeds 10 MPa.The results of the shear numerical simulation indicate that the confining pressure restricts fracture dilation during shearing,promotes the generation of rock debris,and decreases both the permeability and transmissivity of the fracture.The wear results obtained from numerical simulations are consistent with the experimental patterns and correlate with the joint roughness coefficient(JRC).This study proposed an effective numerical simulation method to reveal the evolution mechanism of fracture flow capacity,taking into account the wear of the fracture surface in shear simulations and the initial stress state of the rock in seepage simulations.This research explains the permeability evolution mechanism of fractured shale from a microscopic perspective,and the proposed numerical simulation method for shear seepage provides a powerful means to uncover the dynamic evolution mechanisms governing fracture permeability. 展开更多
关键词 Discrete element method(DEM) Finite element method(FEM) Fracture Permeability Shear stress Joint roughness coefficient(JRC) Dynamic evolution
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Advances in the Element-Free Galerkin Method:From Linear Solid Mechanics to Multi-Physics Applications and Hybrid Domain Coupling 认领 引用
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作者 Álvarez-Hostos Juan C Zambrano-Carrillo Javier A Sarache-Piña Alirio J 《Computer Modeling in Engineering & Sciences》 SCIE EI 2026年第4期62-137,共76页
The Element-Free Galerkin(EFG)method was originally developed for linear solid mechanics problems,using Moving Least Squares(MLS)approximations to construct shape functions for the numerical approximation of the displ... The Element-Free Galerkin(EFG)method was originally developed for linear solid mechanics problems,using Moving Least Squares(MLS)approximations to construct shape functions for the numerical approximation of the displacement field and its variations within the weak form of the equilibrium equations.Over the past decades,it has evolved into a versatile meshfree framework applicable to a broad spectrum of engineering and scientific problems.This review provides a comprehensive account of the main advances in EFG,tracing its development from the original formulation and early challenges to the strategies devised to overcome them.Subsequent improvements in accuracy,stability,and computational efficiency are examined in detail,together with alternative shape function constructions such as Moving Kriging(MK)and Local Maximum Entropy(LME)approximations.The extension of EFG to multiphysics problems is discussed,emphasizing how analogies with the Finite Element Method(FEM)have enabled the adaptation of established stabilization and enrichment techniques.Hybrid FEM-EFG coupling strategies are also reviewed.The article concludes with a survey of significant applications in mechanics and transport phenomena,highlighting their broader implications in science and technology. 展开更多
关键词 Element-free galerkin shape functions applications multiphysics FEM-EFG coupling meshfree methods
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Broadband ground motion simulation and analysis of a near-fault 3D basin-mountain coupling site based on the hybrid method 认领 引用 被引量：1
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作者 Liu Zhongxian Tang Kang +2 位作者 Li Chengcheng Yuan Xiaoming Zhang Hai 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2026年第1期87-110,共24页
This study presents an effective hybrid simulation approach for simulating broadband ground motion in complex near-fault locations.The approach utilizes a deterministic approach based on the spectral element method(SE... This study presents an effective hybrid simulation approach for simulating broadband ground motion in complex near-fault locations.The approach utilizes a deterministic approach based on the spectral element method(SEM),which is used to simulate low-frequency ground motion(f1 Hz).A fourth-order Butterworth filter with zero phase shift is employed for time-domain filtering of low-and high-frequency time series at a crossover frequency of 1 Hz,merging the low and high-frequency ground motions into a broadband time series.Taking an Ms 6.8 Luding earthquake,as an example,this hybrid method was used for a rapid and efficient simulation analysis of broadband ground motion in the region.The accuracy and efficiency of this hybrid method were verified through comparisons with actually observed station data and empirical attenuation curves.Deterministic method simulation results revealed the effects of mountainous topography,basin effects,nonlinear effects within the basin’s sedimentary layers,and a coupling interaction between the basin and the mountains.The findings are consistent with similar studies,showing that near-fault sedimentary basins significantly focus and amplify strong ground motion,and the soil’s nonlinear behavior in the basin influences ground motion to varying extents at different distances from the fault.The mountainous topography impacts the basin’s response to ground motion,leading to barrier effects.This research provides a scientific foundation for seismic zoning,urban planning,and seismic design in nearfault mountain basin regions. 展开更多
关键词 hybrid ground motion simulation method spectral element method three-dimensional stochastic finite fault method near-fault basin-mountain coupling effect basin effect nonlinear effect
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Intralayer structure reconstruction of general weighted output-coupling multilayer complex networks 认领 引用
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作者 Xinwei Wang Yayong Wu +1 位作者 Ying Zheng Guo-Ping Jiang 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第2期287-299,共13页
Multilayer complex dynamical networks,characterized by the intricate topological connections and diverse hierarchical structures,present significant challenges in determining complete structural configurations due to ... Multilayer complex dynamical networks,characterized by the intricate topological connections and diverse hierarchical structures,present significant challenges in determining complete structural configurations due to the unique functional attributes and interaction patterns inherent to different layers.This paper addresses the critical question of whether structural information from a known layer can be used to reconstruct the unknown intralayer structure of a target layer within general weighted output-coupling multilayer networks.Building upon the generalized synchronization principle,we propose an innovative reconstruction method that incorporates two essential components in the design of structure observers,the cross-layer coupling modulator and the structural divergence term.A key advantage of the proposed reconstruction method lies in its flexibility to freely designate both the unknown target layer and the known reference layer from the general weighted output-coupling multilayer network.The reduced dependency on full-state observability enables more deployment in engineering applications with partial measurements.Numerical simulations are conducted to validate the effectiveness of the proposed structure reconstruction method. 展开更多
关键词 multilayer network structure reconstruction cross-layer coupling modulator output coupling
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Effect of Magnetic Hysteresis on Magnon-Magnon Coupling Induced by Interlayer Dzyaloshinskii-Moriya Interaction 认领 引用
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作者 Jihao Xia Yuqiang Wang +8 位作者 Guibin Lan Jiyang Ou Weizhou Wu Jiafeng Feng Caihua Wan Guanxiang Du Syed Rizwan Xiufeng Han Guoqiang Yu 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第1期231-247,共17页
Based on the Smit-Suhl formula,we propose a universal approach for solving the magnon-magnon coupling problem in bilayer coupled systems(e.g.,antiferromagnets).This method requires only the energy expression,enabling ... Based on the Smit-Suhl formula,we propose a universal approach for solving the magnon-magnon coupling problem in bilayer coupled systems(e.g.,antiferromagnets).This method requires only the energy expression,enabling the automatic derivation of analytical expressions for the eigenmatrix elements via symbolic computation,eliminating the need for tedious manual calculations.Using this approach,we investigate the impact of magnetic hysteresis on magnon-magnon coupling in a system with interlayer Dzyaloshinskii-Moriya interaction(DMI).The magnetic hysteresis leads to an asymmetric magnetic field dependence of the resonance frequency and alters the number of degeneracy points between the pure optical and acoustic modes.Moreover,it can result in the coupling strength at the gap of the f–H phase diagram being nearly vanishing,contrary to the conventionally expected maximum.These results deepen the understanding of the effect of interlayer DMI on magnon–magnon coupling and the proposed universal method significantly streamlines the solving process of magnon–magnon coupling problems. 展开更多
关键词 universal approach magnon magnon coupling symbolic computationeliminating magnetic hysteresis bilayer coupled systems egantiferromagnets energy expressionenabling derivation analytical expressions interlayer Dzyaloshinskii Moriya interaction
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Probing strong electron-phonon coupling in semimetallic PtSe2via ultrafast optical spectroscopy 认领 引用
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作者 LIU Shu-yu WU Qi-yi +6 位作者 ZHANG Chen LI Xin LONG Quan CHANG Hao-lin WANG Ying-wei HE Jun MENG Jian-qiao 《Journal of Central South University》 SCIE EI CAS CSCD 2026年第6期2511-2520,共10页
Platinum diselenide(PtSe2)exhibits a distinctive thickness-modulated semiconductor-to-semimetal transition,which makes it suitable for diverse applications in nanoelectronics and optoelectronics.This study systemat... Platinum diselenide(PtSe2)exhibits a distinctive thickness-modulated semiconductor-to-semimetal transition,which makes it suitable for diverse applications in nanoelectronics and optoelectronics.This study systematically investigates the spatiotemporal dynamics of photoexcited carrier relaxation in PtSe2.Through temperature-dependent ultrafast spectroscopy,two distinct low-frequency acoustic phonons(AP)were identified in multilayer PtSe2.Transient absorption microscopy(TAM)measurements reveal thickness-dependent relaxation dynamics and distinct carrier diffusion behavior in multilayer PtSe2.These findings indicate superior carrier transport properties,with a measured mobility of(394.1±38.5)cm2/(V·s)for multilayers.Temperature-dependent ultrafast dynamics,acquired using a custom-built cryogenic pump-probe system,reveal two coherent AP modes with central frequencies ofω1=1.27 THz andω2=0.17 THz,respectively.The higher frequencyω1mode corresponds to the shear mode with a nominal electron-phonon coupling constantλω1=2.22.This study,based on low-temperature ultrafast spectroscopy,elucidates the low-frequency acoustic phonon mode and strong electron-phonon coupling effect in the semimetal PtSe2.These findings lay the foundation for a deeper understanding of the semimetallic properties of PtSe2and for the design of ultrafast photonic devices. 展开更多
关键词 PtSe2 thickness-modulated electron-phonon coupling ultrafast optical low-temperature
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Centrifuge modeling study on near-ground explosions and the coupling of ground shock energy in sandy foundation 认领 引用
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作者 Longhua Guan Zheng Pang +3 位作者 Qiang Lu Yang Ding Yubing Wang Yunmin Chen 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第7期93-109,共17页
Blast effects and energy transfer in near-ground explosions differ significantly from underground scenarios,particularly in terms of ground shock propagation and energy coupling mechanisms across various geological co... Blast effects and energy transfer in near-ground explosions differ significantly from underground scenarios,particularly in terms of ground shock propagation and energy coupling mechanisms across various geological conditions.This study employs centrifuge modeling to simulate near-ground explosions in sandy soil,including surface explosions and airbursts.The focus was on blast-induced cratering,ground shock effects,and energy coupling in sandy foundations.Scaling laws for crater dimensions and ground shock parameters were established and validated based on experimental results.The"modeling of models"series showed good consistency in crater measurements,leading to an empirical formula for estimating crater radius in dry sand.For surface explosions,soil acceleration responses showed single peaks in the central zone(horizontal standoff distance<0.6 m/(kg)1/3)and dual peaks in the near-surface zone(0.79-1.2 m/(kg)1/3)due to combined effects of direct and airburst-induced ground shock.Empirical methods were developed to predict peak acceleration distributions in sandy foundations.Utilizing crater measurements and ground shock propagation laws,a computational approach for evaluating energy transmission in soil foundations was proposed.The study also developed prediction curves for ground shock energy coupling coefficients with scaled blast depth/height,providing a unified model for both underground and near-ground explosions in sandy foundations.The research findings can enhance the methodologies for simulating blast effects and offer a scientific basis for optimizing weapon effectiveness and protective engineering design. 展开更多
关键词 Centrifuge model tests Near-ground explosions Explosion-induced cratering Ground shock Energy coupling
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Three-dimensional full-scale neutronics/thermal-hydraulics/mechanics coupling analysis-based structural assessment of helium-cooled ceramic breeder blanket for fusion reactor 认领 引用
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作者 Qiang Lian Kui Zhang +6 位作者 Shan-Shan Bu Liang-Ming Pan Wen-Xi Tian Sui-Zheng Qiu Guang-Hui Su Xing-Hua Wu Xiao-Yu Wang 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2026年第6期178-195,共18页
To accelerate the development and utilization of fusion energy,the China Fusion Engineering Test Reactor(CFETR)has been proposed as a bridge between the International Thermonuclear Experimental Reactor and demonstrati... To accelerate the development and utilization of fusion energy,the China Fusion Engineering Test Reactor(CFETR)has been proposed as a bridge between the International Thermonuclear Experimental Reactor and demonstration fusion reactors.The primary objective of the CFETR is to achieve fusion energy transformation and tritium self-sufficiency,which is realized through the function of the blanket.In this study,a neutronicshermal-hydraulics/mechanics coupling method is developed and applied to a helium-cooled ceramic breeder(HCCB)blanket,which is one of the two blanket candidates for the CFETR.A three-dimensional full-scale model is utilized in the coupling analysis to obtain the distributions of the neutronic,thermal-hydraulic,and mechanical parameters.A structural assessment of the CFETR HCCB blanket is then conducted considering steady-state conditions and two transient scenarios.The results demonstrate that following optimization of the blanket structure,the maximum temperatures of the different components remain below the safety limit of the corresponding materials.The structural assessment indicates that the blanket maintains its structural integrity under steady-state conditions.However,immediately after an in-box loss-of-coolant accident,structural failure owing to stress concentration may occur.Additionally,in the early stage of a loss-of-flow accident,the stress at the joint point between the cooling plate and cap exceeds the allowable stress of the material,potentially leading to structural failure within 17 s if no protective response is implemented.These findings provide comprehensive insights into the performance and safety of the CFETR HCCB blanket design. 展开更多
关键词 Structural assessment Fusion blanket Three-dimensional full-scale model Coupling analysis CFETR
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