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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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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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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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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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Fatigue of Recycled Concrete Aggregate Asphalt Mixture under Temperature-Humidity Coupling 认领 引用
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作者 CHEN Hao ZHENG Wenhua +5 位作者 JI Jie DONG Zhilei YU Yening WANG Zihao CHEN Meng ZHOU Wenjuan 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2026年第2期523-536,共14页
A comprehensive full-sieve-hole grading correction method was used to adjust aggregate gradings.The fatigue properties of recycled concrete aggregate(RCA)asphalt mixtures were investigated using an improved indirect t... A comprehensive full-sieve-hole grading correction method was used to adjust aggregate gradings.The fatigue properties of recycled concrete aggregate(RCA)asphalt mixtures were investigated using an improved indirect tensile fatigue test under temperature-humidity coupling based on 20-year meteorological data of Beijing,and the degeneration mechanism was further explored by scanning electron microscopy and energy-dispersive spectroscopy.The experimental results indicate that replacing 5-20 mm coarse limestone aggregate(LA)with RCA at a 50% substitution volume can mitigate the impact of RCA variations on the asphalt mixture proportioning design.All RCA asphalt mixtures have lower initial fatigue properties than the LA asphalt mixture.However,under temperature-humidity coupling,the long-term fatigue property of an RCA asphalt mixture with a low proportion of recycled brick exceeds that of the LA asphalt mixture,and the fatigue life decline rate of the RCA asphalt mixture during 10-year service decreases by approximately 25%.This is due to the penetration of the asphalt mortar into the RCA through the pores and cracks on the RCA surface.It forms an interfacial transition zone composed of asphalt mortar and cement mortar and further reduces the mixture damage caused by the water and freeze-thaw conditions. 展开更多
关键词 recycled concrete aggregate asphalt mixture temperature-humidity coupling fatigue property micromechanism
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Controlling mechanism and quantitative characterization of thermalhydraulic coupling properties of moraine soil containing frozen inclusions 认领 引用
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作者 ZHU Wenyu LI Changdong +3 位作者 TAN Jie ZHOU Jiaqing WANG Xueying Ehsan PEGAH 《Journal of Mountain Science》 SCIE CSCD 2026年第5期2323-2346,I0050-I0062,共24页
The thermal-hydraulic coupling processes in moraine soils containing frozen inclusions are prevalent in cold alpine regions(for example,the Tibetan Plateau)and closely linked to various mountainous geological hazards.... The thermal-hydraulic coupling processes in moraine soils containing frozen inclusions are prevalent in cold alpine regions(for example,the Tibetan Plateau)and closely linked to various mountainous geological hazards.Despite extensive research,characterizing this coupling process remains challenging.This study investigates the evolution of the thermal-hydraulic properties of moraine soils containing frozen inclusions under warm water flow,considering key parameters and phase change.Parameter values were calibrated using field and laboratory data.The simulation results show the monotonic trend of outlet temperature,ice content and permeability.Thermal conductivity,soil porosity,fluid temperature,frozen inclusion content,and initial matrix permeability play predominant roles in the evolution process.Based on these findings,comprehensive models to quantitatively characterize the seepage evolution process were developed and discriminant models for two equilibrium states were established,incorporating critical factors.Furthermore,an in-depth discussion on the simulation of the phase-change process and the selection of the relative permeability range was provided.The findings enhance our understanding of thermal-hydraulic coupling processes in moraine soils and offer a valuable reference framework for future studies in this field. 展开更多
关键词 Moraine soil Thermal-hydraulic coupling Phase change Sensitivity analysis Semiempirical model
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Coordinated observations on the spatiotemporal development of global-scale dipolarizations and their coupling to meso-scale dipolarizations 认领 引用
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作者 Sheng Tian J.M.Weygand +5 位作者 J.Liu J.R.Wygant L.Lyons V.Angelopoulos J.Bortnik G.D.Reeves 《Earth and Planetary Physics》 EI CSCD 2026年第2期291-301,共11页
Global-and meso-scale dipolarizations are well-known features of Earth’s magnetosphere,but their coupling remains poorly understood.Here,using a new approach that combines two-dimentional(2D)ionospheric field-aligned... Global-and meso-scale dipolarizations are well-known features of Earth’s magnetosphere,but their coupling remains poorly understood.Here,using a new approach that combines two-dimentional(2D)ionospheric field-aligned current(FAC)maps with coordinated observations from a network of magnetospheric satellites,we directly show that individual global-scale dipolarizations can expand from the nightside to,or even into,the dayside.These expansions are enduring(20–30 minutes),slow(2–4 deg/min),and global in extent(up to 12 h in local time),consistent with previous statistical inferences but now explicitly observed.The expanding FACs form a two-sheet current system as described by the Boström II model.In contrast,meso-scale dipolarizations are bursty(a few minutes),fast(several tens deg/min),and localized(several hours in local time),as evidenced by auroral expansions and satellite data.They are associated with the line-current system as described by the Boström I model(i.e.,the substorm current wedge).Notably,meso-scale dipolarizations often emerge near the expanding edge of a global-scale dipolarization,suggesting a dynamic coupling between the two scales.These observations provide a complementary scenario to the simulation-based interpretation that global-scale dipolarizations result from the accumulation of meso-scale dipolarizations.Here,meso-scale dipolarizations appear far less frequently than in simulations and occur around the edge of global-scale dipolarizations.This result implies that meso-scale dipolarizations may be sporadically triggered during the azimuthal expansion of global-scale dipolarizations. 展开更多
关键词 dipolarization field-aligned current magnetosphere−ionosphere coupling
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Variable-angle shear-compression instability in coal:Mechanistic insights and precursor identificationunder hydrochemicalmechanical coupling 认领 引用
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作者 Xiaojun Feng Weitao Yue +2 位作者 Zhiwei Cao Shuaishuai Zhou Enyuan Wang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第6期4435-4456,共22页
In deep coal mining,mine water containing acidic ions(Cl⁻,SO₄²⁻)often results in the saturation of coal over extended periods,causing physicochemical damage and compromising structural stability.The objective of ... In deep coal mining,mine water containing acidic ions(Cl⁻,SO₄²⁻)often results in the saturation of coal over extended periods,causing physicochemical damage and compromising structural stability.The objective of this study is to elucidate the instability mechanisms of coal subjected to compression-shear fracture in coupled hydrochemical-mechanical environments.Through uniaxial staged loading tests with variable shear angles(α=30°-70°),acoustic emission(AE)monitoring,scanning electron microscopy(SEM)characterization,and discrete element method(DEM),a systematical investigation was conducted to explore the damage evolution of coal saturated in neutral(pH=7)/weakly acidic(pH=5.5)conditions.The results indicate that both shear angles(α)and water chemistry significantly affect the damage evolution of coal.As the shear angle increases,the failure mode shifts from axial splitting to shear dominance,and the b-value decreases from 2.1 to 1.4.Weakly acidic conditions markedly accelerate the damage process,altering the energy release mode from gradual accumulation to sudden,concentrated release.Moment tensor analysis reveals that tensile sources are dominant at low α(45%).At the microscale,coal weakness is primarily induced by the selective dissolution of kaolinite,the formation of interfacial microcracks,and the loss of cementing material under acidic conditions.Based on the critical slowing down(CSD)theory,a precursory warning method focused on variance(S²)and the autocorrelation coefficient(φ)is proposed.These findings provide a theoretical basis for the risk assessment of dynamic disasters in mining and stratified prevention strategies for coal seams with different inclinations. 展开更多
关键词 Dynamic disaster Hydrochemical-mechanical coupling Variable-angle compression-shear Instability mechanism Precursor warning
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Magnetoelastic coupling enhancement induced by a phonon channel in multiferroic composites 认领 引用
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作者 Chunrui Peng Junru Li +4 位作者 Haoran Niu Dongxing Zhang Qiuquan Guo Xiangwei Zhu Jun Yang 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第2期402-416,共15页
Enhancing the nonconservative force exerted on the ferromagnetic material is a key strategy for improving magnetoelastic coupling in multiferroic composites.Inspired by the mechanism of pulsed lasers injecting phonons... Enhancing the nonconservative force exerted on the ferromagnetic material is a key strategy for improving magnetoelastic coupling in multiferroic composites.Inspired by the mechanism of pulsed lasers injecting phonons directly into ferromagnetic materials,we propose a method to introduce and amplify phonons by constructing a“phonon channel”.Analyzing the magnon excitation spectrum reveals that magnetoelastic coupling is significantly enhanced with an increasing amplification coefficient Apof nonconservative force in the phonon channel.When the external magnetic field is parallel to the wave vector of the spin wave,the amplitude of magnons in the anti-crossing region exhibits left-right symmetry with respect to the crossing point.In contrast,when the magnetic field is perpendicular,the symmetry becomes up-down.Introducing a coupling layer into the multiferroic composites provides a viable approach to realizing the phonon channel.Taking a multiferroic composite structure consisting of polyvinylidene fluoride and yttrium iron garnet as an example,we compare the electrical and acoustic properties of multiferroic composites with and without a coupling layer in the microwave frequency band.The enhancement of electrical and acoustic properties confirms the effectiveness of the phonon channel in multiferroic composites. 展开更多
关键词 Magnetoelastic coupling Nonconservative force Piezomagnetic effect Acoustic impedance Multiferroic composites
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High-fidelity numerical simulation of ocean-bottom node 4C seismic data using the acoustic-elastic coupling equation 认领 引用
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作者 Peng-Fei Yu Yong-Tian Zhao +2 位作者 Jia-Wei Zhang Xiao-Hui Yang Chao Zhang 《Petroleum Science》 SCIE EI CAS CSCD 2026年第6期3160-3179,共20页
The complex wavefields in ocean-bottom node(OBN)four-component(4C)seismic data,particularly interface waves like Scholte waves,pose significant challenges for processing and inversion.A key issue is how to achieve hig... The complex wavefields in ocean-bottom node(OBN)four-component(4C)seismic data,particularly interface waves like Scholte waves,pose significant challenges for processing and inversion.A key issue is how to achieve high-fidelity and accurate simulation of seismic wave propagation phenomena at the ocean bottom,thereby providing a theoretical foundation for fully leveraging ocean-bottom 4C data in imaging and inversion.To address this,we employ a three-dimensional acoustic-elastic coupling equation(AECE)for high-fidelity numerical simulation of OBN 4C data.This method inherently satisfies the fluid-solid interface conditions without manual enforcement,enabling physically consistent generation of all wave types,including Scholte waves.Numerical examples and field data from the East China Sea demonstrate that the AECE effectively replicates the waveform components and characteristics of field 4C data.This establishes the AECE as a robust foundation for OBN 4C data processing,elastic imaging,and full-waveform inversion. 展开更多
关键词 Numerical simulation Acoustic-elastic coupling equation Ocean-bottom node Four-component data Scholte wave
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Effect of silane coupling agents on interfacial features and joint performance of ultrasonically welded AA6061 aluminum alloy to carbon fiber reinforced PA6 认领 引用
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作者 Haipeng ZHOU Yufan CAI +2 位作者 Yuanduo YANG Sansan AO Yang LI 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第5期574-592,共19页
The use of Silane Coupling Agent(SCA)is an important way to improve the joining quality between metal and plastic.However,how to rationally use SCAs is still lack of guidance.We investigate the effect of type of SCA,s... The use of Silane Coupling Agent(SCA)is an important way to improve the joining quality between metal and plastic.However,how to rationally use SCAs is still lack of guidance.We investigate the effect of type of SCA,soaking time of SCA,and combination of SCA on the interfacial features and joint performance of ultrasonically welded AA6061 to CF/PA6.Four SCAs(γ-chloropropyltrimethoxysilane(NQ54),γ-chloropropyltriethoxysilane(KH230),vinyltrimethoxysilane(A171),γ-aminopropyltriethyloxysilane(KH550))were selected.The results show that the optimal joint strength(30.2 MPa)is obtained when the Al sheets are soaked in KH550 for 3 min.A fully dehydrated condensation reaction occurs between the OAH of the KH550 and the OAH on the aluminum alloy surface,forming plenty of Si AOAAl bonds,which contribute to the improved wetting behavior of liquid PA6 on the aluminum alloy surface.However,the combination of SCAs leads to the consumption of functional groups,hindering the formation of Si AOAAl bonds,and therefore reducing the joint performance. 展开更多
关键词 Aluminum alloy Carbon fiber reinforced thermoplastic Coupling agent Performance Silane Ultrasonic welding
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Shear fracturing behavior and mechanism of intact granite under thermal-mechanical coupling loading 认领 引用
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作者 Fanzhen Meng Zhengyang Xu +5 位作者 Jianhua Han Qijin Cai Yuantao Wen Zaiquan Wang Yuzong Li Jingjing Lu 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第2期1429-1446,共18页
High rock temperature is a great challenge frequently encountered during subsurface resource recovery and deep underground space utilization,and it is still unclear how the granitic rock responds to realtime high temp... High rock temperature is a great challenge frequently encountered during subsurface resource recovery and deep underground space utilization,and it is still unclear how the granitic rock responds to realtime high temperature upon shear loading.To better understand the shear fracture behavior and underlying processes of intact granite exposed to thermal-mechanical coupling loading,direct shear tests were conducted utilizing a newly built testing apparatus at varied normal stresses and high temperatures.Influencesof different temperatures and different heating methods(real-time heating and thermal treatment)on the shear mechanical behavior were compared and discussed.Results indicate that shear stress fluctuationswith some small stress drops occur as shear stress is approaching the peak strength under real-time heating,accompanied by more and earlier AE signal uprushes.This suggests that greater cracking events occur earlier during real-time heating than after thermal treatment,resulting in a lower peak shear strength.Furthermore,the peak shear strength,post-peak stress drop,and cohesion rise from room temperature(RT)to 200℃(the peak strength increases by 8%,5.8%,and 9.9%under normal stress of 5 MPa,15 MPa,and 20 MPa,correspondingly),and subsequently decline from 200℃to 400℃.Temperature has a limited impact on shear stiffness from RT to 200℃,but significantlyreduces it from 200℃to 400℃,with drops of 15%,7.9%,and 10%under normal stress of 5 MPa,15 MPa,and 20 MPa,respectively.Moreover,the shear strength and stiffness under real-time heating are lower than those for the thermally treated specimens.The strengthening of intact granite below 200℃upon shear is associated with loss of water and a more compacted structure,while the weakening effect of temperature on shear strength from 200℃to 400℃is due to the new thermal cracks and less brittle and stiff of minerals. 展开更多
关键词 Thermal-mechanical coupling Direct shear test Thermal cracks Granite shear failure
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A unified approach to study coupling behavior of friction and ball motion in ball screws 认领 引用
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作者 Yuhao Zhang Peijuan Cui +2 位作者 Jialong Yang Zhenzhen Wu Wei Pu 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2026年第1期345-355,共11页
There is a strong coupling relationship between the friction characteristics of the ball-groove interface and the ball motion behavior.However,available studies tend to consider ball motion and frictional behavior sep... There is a strong coupling relationship between the friction characteristics of the ball-groove interface and the ball motion behavior.However,available studies tend to consider ball motion and frictional behavior separately.In this paper,a unified tribology-kinematic model is established considering the coupling effect between friction and the ball velocity vector.The friction in ball-groove contact and ball speed are simultaneously measured by a newly developed disc-ball-disc device for studying friction and movement in ball screws.A comprehensive analysis of rubbing interface behavior and ball motion is conducted.The results show that the coupling effect between friction in ball-groove contact and ball motion is quite obvious.The sliding velocity of the ball is much higher with coupling effect than that when ignoring coupling influence,especially at high-speed conditions.The friction in ball-groove contact decreases at first and then shows a dramatic increase with the gradual rise of rotation speed,which is caused by the coupling variation of sliding speed.The studies show that the disc-ball-disc approach is an innovative and valuable method to investigate friction and ball motion in ball screws. 展开更多
关键词 Ball screws Tribology-kinematics coupling analysis Ball motion Friction behavior Mixed lubrication
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A hyperelastic constitutive model accounting for tension-shear coupling in preforming modelling of 3D woven fabrics 认领 引用
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作者 Chuang LIU Yuchen ZHU +4 位作者 Yanqi HU Hui CHENG Kaifu ZHANG Renzi BAI Biao LIANG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第6期308-320,共13页
The accurate preforming modelling of 3D woven fabrics is essential for their forming quality control and optimization.However,their tension-shear coupling during preforming is not considered in the existing models.To ... The accurate preforming modelling of 3D woven fabrics is essential for their forming quality control and optimization.However,their tension-shear coupling during preforming is not considered in the existing models.To address this issue,an anisotropic hyperelastic constitutive model considering the tension-shear coupling was established for 3D woven fabrics.A picture frame tester was designed and manufactured to investigate tension-shear coupling effect.The results show that the fiber pre-tension can significantly enhance the shear resistance of 3D woven fabrics.The biaxial pre-tension of 1.5%can increase the in-plane shear force by up to 2.25 times compared to that in the pure in-plane shear.The identified tension-shear coupling parameters were integrated into the hyperelastic constitutive model and were implemented via user subroutine in Abaqus.The model’s effectiveness was verified by the hemispherical and fan blade forming experiments.The proposed coupled model demonstrates higher prediction accuracy than the uncoupled model in terms of shear angle and force,which provides a valuable tool for the optimization of forming process of 3D woven fabric. 展开更多
关键词 Constitutive models 3D woven fabrics Finite element method Preforming Tension-shear coupling
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Multiparameter hierarchical sensitivity analysis of tilt-to-length coupling noise in Taiji science interferometer 认领 引用
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作者 Fei Xie Xiaodong Peng +2 位作者 Wenlin Tang Mengyuan Zhao Xiaoshan Ma 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第1期399-408,共10页
Tilt-to-length(TTL)coupling noise is a critical issue in space-based gravitational wave detection due to its complex dependence on multiple interacting factors,which complicates the identification of dominant paramete... Tilt-to-length(TTL)coupling noise is a critical issue in space-based gravitational wave detection due to its complex dependence on multiple interacting factors,which complicates the identification of dominant parameters.To address this challenge,we develop a simulation model of the Taiji scientific interferometer,generating noise datasets under multiparameter conditions.Given the uniqueness of the telescope as well as the convergence behavior of the algorithm,the analysis is structured hierarchically:(i)the telescope level and(ii)the optical bench level.A hierarchical framework combining XGBoost and SHapley Additive exPlanations(SHAP)values is employed to model the intricate relationships between parameters and TTL coupling noise,supplemented by sensitivity analysis.Our results identify pointing jitter and telescope radius as the dominant parameters at the telescope level,while the angles of the plane mirrors and beam splitters are most influential at the optical bench level.The parameter space is reduced from 86 dimensions to 14 dimensions without sacrificing model accuracy.This approach offers actionable insights for optimizing the Taiji interferometer design. 展开更多
关键词 space-based gravitational wave detection intrasatellite science interferometer tilt-to-length coupling noise sensitivity analysis
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Low-Loading Gold Nanoclusters on Zinc Oxide Enable Efficient Photocatalytic Oxidative Coupling of Methane 认领 引用
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作者 Xiaotong Zhang Tingxuan Ran +3 位作者 Jiaqi Zhao Lingsong Wang Run Shi Tierui Zhang 《Transactions of Tianjin University》 EI CAS 2026年第2期118-127,共10页
Photocatalytic oxidative coupling of methane(POCM)is a promising strategy for the production of sustainable C2+hydrocarbons;however,it typically relies on large quantities of noble metals,such as gold,to serve as a... Photocatalytic oxidative coupling of methane(POCM)is a promising strategy for the production of sustainable C2+hydrocarbons;however,it typically relies on large quantities of noble metals,such as gold,to serve as active sites for methyl coupling.In this study,we demonstrate that ZnO-supported gold nanoclusters with an average diameter of 1.1 nm provide a robust alternative to conventional gold nanoparticles,enabling efficient POCM even at ultralow gold loadings of 0.1 wt%.The optimized photocatalyst affords a C2–C4 hydrocarbon production rate of 3.89 mmol/(g h)with 94.8%selectivity under 365 nm irradiation in a batch reactor.Results reveal that the abundant interfaces between highly dispersed gold nanoclusters and ZnO substrates facilitate charge carrier separation and promote a light-induced Mars–van Krevelen reaction pathway.Methyl adsorption causes gold nanoclusters to exhibit a more intense d-σhybridization state compared to gold nanoparticles,enhancing electron transfer interactions and substantially reducing the transition-state energy barrier for methyl coupling. 展开更多
关键词 Photocatalysis Oxidative coupling of methane Nanoclusters Zinc oxide Natural gas
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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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