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A PRELIMINARY STUDY ON THE 3DVAR ASSIMILATION OF THE AMSU-A DATA IN SPACE-TIME MULTISCALE ANALYSIS SYSTEM 认领 引用 被引量：5
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作者 LIU Rui-xia XIE Yuan-fu LIU Jie 《Journal of Tropical Meteorology》 SCIE 2017年第3期314-322,共9页
Assimilating satellite radiances into Numerical Weather Prediction(NWP) models has become an important approach to increase the accuracy of numerical weather forecasting. In this study, the assimilation technique sche... Assimilating satellite radiances into Numerical Weather Prediction(NWP) models has become an important approach to increase the accuracy of numerical weather forecasting. In this study, the assimilation technique scheme was employed in NOAA's STMAS(Space-Time Multiscale Analysis System) to assimilate AMSU-A radiances data.Channel selection sensitivity experiments were conducted on assimilated satellite data in the first place. Then, real case analysis of AMSU-A data assimilation was performed. The analysis results showed that, following assimilating of AMSU-A channels 5-11 in STMAS, the objective function quickly converged, and the channel vertical response was consistent with the AMSU-A weighting function distribution, which suggests that the channels can be used in the assimilation of satellite data in STMAS. With the case of the Typhoon Morakot in Taiwan Island in August 2009 as an example, experiments on assimilated and unassimilated AMSU-A radiances data were designed to analyze the impact of the assimilation of satellite data on STMAS. The results demonstrated that assimilation of AMSU-A data provided more accurate prediction of the precipitation region and intensity, and especially, it improved the 0-6h precipitation forecast significantly. 展开更多
关键词 multigrid 3DVAR space-time multiscale analysis system numerical experiments
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Multiscale analysis of fine slag from pulverized coal gasification in entrained-flow bed 认领 引用 被引量：1
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作者 Lirui Mao Mingdong Zheng +5 位作者 Baoliang Xia Facun Jiao Tao Liu Yuanchun Zhang Shengtao Gao Hanxu Li 《International Journal of Coal Science & Technology》 EI CAS CSCD 2024年第1期119-132,共14页
Fine slag(FS)is an unavoidable by-product of coal gasification.FS,which is a simple heap of solid waste left in the open air,easily causes environmental pollution and has a low resource utilization rate,thereby restri... Fine slag(FS)is an unavoidable by-product of coal gasification.FS,which is a simple heap of solid waste left in the open air,easily causes environmental pollution and has a low resource utilization rate,thereby restricting the development of energy-saving coal gasification technologies.The multiscale analysis of FS performed in this study indicates typical grain size distribution,composition,crystalline structure,and chemical bonding characteristics.The FS primarily contained inorganic and carbon components(dry bases)and exhibited a"three-peak distribution"of the grain size and regular spheroidal as well as irregular shapes.The irregular particles were mainly adsorbed onto the structure and had a dense distribution and multiple pores and folds.The carbon constituents were primarily amorphous in structure,with a certain degree of order and active sites.C 1s XPS spectrum indicated the presence of C–C and C–H bonds and numerous aromatic structures.The inorganic components,constituting 90%of the total sample,were primarily silicon,aluminum,iron,and calcium.The inorganic components contained Si–O-Si,Si–O–Al,Si–O,SO42−,and Fe–O bonds.Fe 2p XPS spectrum could be deconvoluted into Fe 2p1/2 and Fe 2p3/2 peaks and satellite peaks,while Fe existed mainly in the form of Fe(III).The findings of this study will be beneficial in resource utilization and formation mechanism of fine slag in future. 展开更多
关键词 Coal gasification Fine slag Multiscale analysis Carbon components Inorganic components
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Multiscale Analysis of the Effect of Debris on Fretting Wear Process Using a Semi-Concurrent Method 认领 引用
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作者 Shengjie Wang Tongyan Yue Magd Abdel Wahab 《Computers, Materials & Continua》 SCIE EI 2020年第1期17-35,共19页
Fretting wear is a phenomenon,in which wear happens between two oscillatory moving contact surfaces in microscale amplitude.In this paper,the effect of debris between pad and specimen is analyzed by using a semi-concu... Fretting wear is a phenomenon,in which wear happens between two oscillatory moving contact surfaces in microscale amplitude.In this paper,the effect of debris between pad and specimen is analyzed by using a semi-concurrent multiscale method.Firstly,the macroscale fretting wear model is performed.Secondly,the part with the wear profile is imported from the macroscale model to a microscale model after running in stage.Thirdly,an effective pad’s radius is extracted by analyzing the contact pressure in order to take into account the effect of the debris.Finally,the effective radius is up-scaled from the microscale model to the macroscale model,which is used after running in stage.In this way,the effect of debris is considered by changing the radius of the pad in the macroscale model.Due to the smaller number of elements in the microscale model compared with the macroscale model containing the debris layer,the semi-concurrent method proposed in this paper is more computationally efficient.Moreover,the results of this semi-concurrent method show a better agreement with experimental data,compared to the results of the model ignoring the effect of debris. 展开更多
关键词 Fretting wear debris multiscale analysis semi-concurrent
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Multiscale analysis of the contents of palmatine in the Nature populations of Phellodendron amurense in Northeast China 认领 引用 被引量：2
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作者 Minglong Sun Lijiao Xu +3 位作者 Yingli Peng Tong Liu Yuhong Zhang Zhiqiang Zhou 《Journal of Forestry Research》 SCIE CAS CSCD 2016年第2期265-272,共8页
Palmatine is a valuable ingredient in Chinese medicine that is produced by Phellodendron amurense Rupr. The contents of palmatine content in root bark, trunk bark, perennial branch bark, annual branches, and leaves of... Palmatine is a valuable ingredient in Chinese medicine that is produced by Phellodendron amurense Rupr. The contents of palmatine content in root bark, trunk bark, perennial branch bark, annual branches, and leaves of the trees with different ages and geographies in Northeast China were measured by high-performance liquid chromatography. The contents of palmatine in the barks of root, trunk, and perennial branch were significantly higher than those in annual branches and leaves. The contents of palmatine in trunk bark and root bark from Lesser Khingan Mountains increased with age, which is significantly opposite to other three vegetation types. The contents of palmatine in perennial branch bark, annual bark and leaves had no significant reg- ularity. Moreover, the contents of palmatine in samples of root bark, trunk bark, perennial branch bark and annual bark varied significantly with latitude. The nature populations of P. amurense growing at low latitude contained significantly more palmatine than those growing at high latitude. These results provide a scientific basis for the reasonable cultivation and efficient utilization of P. amurense. 展开更多
关键词 Content variations Multiscale analysis Palmatine Phellodendron amurense
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Multiscale analysis of spring discharge and the time-variant characteristic of Karst groundwater system 认领 引用
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《Global Geology》 1998年第1期73-74,共2页
关键词 time Multiscale analysis of spring discharge and the time-variant characteristic of Karst groundwater system
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Mechanistic analysis of drag force model for carbon nanotube fluidized bed based on CFD-DEM with multiscale analysis 认领 引用
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作者 Chenyu Gao Xijun Zhang +4 位作者 Peng Wang Yan Li Dianming Chu Wenjuan Bai Yan He 《Particuology》 SCIE EI CAS CSCD 2026年第1期25-40,共16页
This study investigates the fluidization of aggregative carbon nanotubes(CNTs)by integrating the computational fluid dynamics-discrete element method(CFD-DEM)with a novel multiscale analysis framework.Systematic compa... This study investigates the fluidization of aggregative carbon nanotubes(CNTs)by integrating the computational fluid dynamics-discrete element method(CFD-DEM)with a novel multiscale analysis framework.Systematic comparisons with high-speed imaging experiments reveal that Gidaspow model's piecewise formulation delivers optimal simulation performance in the dense-dilute transition zone,but it overestimates the stable fluidization pressure drop by 19.7%due to the Ergun equation's overprediction of viscous dissipation.Furthermore,multiscale analysis demonstrates that system-averaged particle energy(kinetic,gravitational potential,and rotational energy)nonlinearly modulates reactor-scale fluidization uniformity(R2=0.69010.8570).This paper elucidates the underlying mechanisms behind the discrepancies in simulation results among various traditional drag models,thereby providing mechanistic insights and data-driven guidance for model selection in laboratoryscale simulations of particle fluidization. 展开更多
关键词 Numerical simulation Interphase drag force Multiscale analysis CNTs Fluidized bed
Multiscale analysis on the wear process of cemented carbide tools during titanium alloy machining 认领 引用 被引量：1
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作者 Wenmeng Zhou Pingfa Feng +6 位作者 Wen Ji Zhongyu Wang Yuan Ma Enlai Jiang Huiting Zha Zhipeng Cai Feng Feng 《Friction》 SCIE EI CAS CSCD 2025年第3期127-139,共13页
Cemented carbide tools are widely utilized in titanium alloy machining.However,severe tool wear usually occurs during machining;thus,the wear process has attracted widespread attention.Electromagnetic treatment was ap... Cemented carbide tools are widely utilized in titanium alloy machining.However,severe tool wear usually occurs during machining;thus,the wear process has attracted widespread attention.Electromagnetic treatment was applied in our previous study to significantly improve the tool life of cemented carbide tools in Ti6Al4V machining.To investigate the effect of electromagnetic treatment on wear performance,a multiscale analysis of the wear process of cemented carbide tools in the turning process,including microdefects and wear topography at various scales,was conducted in the present study.The distribution of dislocations in the tool material was measured through electron backscatter diffraction,and the surface topographies in the wear area during the Ti6Al4V cutting process were recorded via white light interferometry.Fractal analysis based on the scaling property of surface roughness was carried out to further quantify the wear performance of the tools.The results revealed that the wear mechanism of the cutting tools was mainly adhesion and diffusion,and the diffusion wear of the electromagnetically treated tools was less than that of the untreated tools.Based on the multiscale analysis of flank wear,the effect of electromagnetic treatment on the enhancement of the wear resistance of cemented carbide cutting tools was demonstrated.The multiscale analysis of the wear performance of cutting tools in this study effectively revealed the mechanism by which electromagnetic treatment enhances wear resistance,thus contributing to filling the research gap of traditional studies on tool wear that generally employ single scales. 展开更多
关键词 tool wear multiscale analysis fractal dimension microdefects electromagnetic treatment
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Multiscale energy conversion and transfer in the middle atmosphere during the 2023 sudden stratospheric warming 认领 引用
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作者 XiaoQi Wu CunYing Xiao +3 位作者 ZeWei Wang Yang Yu Luo Xiao Hao Li 《Earth and Planetary Physics》 EI CSCD 2026年第3期482-496,共15页
To understand energy transfer during sudden stratospheric warming (SSW) events in the middle atmosphere, the 2023 SSW is studied by using the analysis tools of the multiscale window transform (MWT) and MWT-based local... To understand energy transfer during sudden stratospheric warming (SSW) events in the middle atmosphere, the 2023 SSW is studied by using the analysis tools of the multiscale window transform (MWT) and MWT-based localized energetics analysis and theory of canonical transfer (MS-ECT). The energy transfer in the mesosphere is diagnosed and compared with that in the stratosphere. The energy fields are first reconstructed onto three scale windows: a large-scale window, an SSW-scale window, and a synoptic-scale window. Results showed that the work done by pressure (pressure flux) plays a critical role in coupling the mesosphere and stratosphere during SSW events. The cross-scale energy transfer (canonical transfer) of available potential energy is always directed from the large-scale to the SSW-scale window, indicating the central role of baroclinic instability in both the stratosphere and mesosphere. Comparative analysis with the 2012-2013 SSW event revealed the consistent presence of baroclinic instability across both events. However, the 2023 event exhibited significantly stronger energy transfer magnitudes in the mesosphere. These results highlight the consistent role of baroclinic instability and pressure flux in mediating cross-scale energy transfer during SSWs, providing a clearer understanding of stratosphere-mesosphere coupling. 展开更多
关键词 sudden stratospheric warming multiscale energetics analysis middle atmosphere
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Multiscale Failure Mechanism Analysis of SiC Fiber‑Reinforced TC17 Composite Subjected to Transverse Tensile Loading at Elevated Temperature 认领 引用 被引量：5
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作者 Qiu‑Yue Jia Yu‑Min Wang +6 位作者 Xu Zhang Guo‑Xing Zhang Qing Yang Li‑Na Yang Xu Kong Xiao‑Fang Li Rui Yang 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2023年第6期1007-1022,共16页
This study presents a multiscale method to evaluate the transverse tensile strength and failure mechanism of SiCf/TC17 cruciform specimen machined from a large-size ring.The mechanical properties and failure of the... This study presents a multiscale method to evaluate the transverse tensile strength and failure mechanism of SiCf/TC17 cruciform specimen machined from a large-size ring.The mechanical properties and failure of the specimen were evaluated through a macroscale model under transverse tensile loading at 200°C.A mesoscale model was developed to analyze the transverse tensile behavior and failure of the composite specimen.Interfacial debonding,plastic deformation of matrix and cladding,and damage to the composite core were incorporated into the mesoscopic and macroscopic models.The stress–strain curves and fracture modes obtained from the numerical simulation showed good agreement with the experimental curves,acoustic emission test results,and fracture morphology.The simulation results suggested that the damage to the central region interface and the plastic deformation of the matrix initiated first and propagated outwards.Subsequently,the interfacial failure,matrix failure,and formation of macro-crack developed,which led to the crack of the titanium matrix composite core.Finally,cladding was plastically deformed and crack developed,which led to the severe failure of the cruciform specimen. 展开更多
关键词 Continuous fiber-reinforced titanium matrix composite Transverse tensile behavior Multiscale analysis Failure mechanism
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Multiscale analysis of single- and multiple-pulse laser-induced damages in HfO_2/SiO_2 multilayer dielectric films at 532 nm 认领 引用 被引量：2
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作者 刘文文 魏朝阳 +1 位作者 易葵 邵建达 《Chinese Optics Letters》 SCIE EI CAS CSCD 2015年第9期53-57,共5页
Nanosecond single- and multiple-pulse laser damage studies on HfOffSiO2 high-reflection （HR） coatings are performed at 532 nm. For single-pulse irradiation, the damage is attributed to the defects and the electric i... Nanosecond single- and multiple-pulse laser damage studies on HfOffSiO2 high-reflection （HR） coatings are performed at 532 nm. For single-pulse irradiation, the damage is attributed to the defects and the electric intensity distribution in the multilayer thin films. When the defect density in the irradiated area is high, delami- nation is observed. Other than the 1064 nm laser damage, the plasma scalding of the 532 nm laser damage is not pits-centered for normal incidence, and the size of the plasma scalding has no relation to the defect density and position, but increases with the laser fluence. For multiple-pulse irradiations, some damage sites show deeper precursors than those from the single-shot irradiation due to the accumulation effects. The cumulative laser- induced damages behave as pits without the presence of plasma scalding, which is unaffected by the laser fluence and shot numbers. The damage morphologies and depth information both confirm the fatigue effect of a HfO2/SiO2 HR coating under 532 nm laser irradiation. 展开更多
关键词 Multiscale analysis of single and multiple-pulse laser-induced damages in HfO2/SiO2 multilayer dielectric films at 532 nm
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Multiscale analysis of composite material reinforced by randomly-dispersed particles 认领 引用
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作者 Jiaoyan Li James D.Lee Ken P.Chong 《International Journal of Smart and Nano Materials》 EI 2012年第1期2-13,共12页
A multiscale analysis method is presented in which detailed information on the microscopic level is incorporated into macroscopic models capable of simulating damage evolution and ultimate failure.The composite consid... A multiscale analysis method is presented in which detailed information on the microscopic level is incorporated into macroscopic models capable of simulating damage evolution and ultimate failure.The composite considered is reinforced by randomly-dispersed particles,which reflects the statistical characteristics of real materials,such as cement-based materials.Specifically,a three-dimensional material body is decomposed into many unit cells.Each unit cell is reinforced by a cylindrical particle,the orientation of which is characterized by three Euler angles generated by the random number generator.Based on a detailed finite element analysis,the material properties of the representative volume element are obtained.As verification,the properties of the cylindrical particles are set equal to those of the matrix and the computed‘composite’properties reduce exactly to those of the‘isotropic’material,as expected.Through coordinate transformation,the effective material properties of each unit cell are calculated.The assembly of stiffness matrices of all unit cells leads to the stiffness matrix of the whole specimen.Under the simple tension loading condition,the initial damaged unit cell can be identified according to the vonMises yield criterion.The stiffness of the damaged unit cell will then be reduced to zero and it will cause stress redistribution and trigger further damage.It was found that the reinforcement is effective to mitigate and arrest the damage propagation,and therefore prolongs the material’s lifetime.These results suggest that the hierarchical coupling approaches used here may be useful for material design and failure protection in composites. 展开更多
关键词 multiscale analysis random response finite element method representative volume element Euler angle damage propagation
A Multiscale Method for Damage Analysis of Quasi-Brittle Heterogeneous Materials 认领 引用 被引量：1
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作者 Filip Putar Jurica Soric +1 位作者 Tomislav Lesicar Zdenko Tonkovic 《Computer Modeling in Engineering & Sciences》 SCIE EI 2019年第7期123-156,共34页
A novel multiscale algorithm based on the higher-order continuum at both micro-and macrostructural level is proposed for the consideration of the quasi-brittle damage response of heterogeneous materials.Herein,the mic... A novel multiscale algorithm based on the higher-order continuum at both micro-and macrostructural level is proposed for the consideration of the quasi-brittle damage response of heterogeneous materials.Herein,the microlevel damage is modelled by the degradation of the homogenized stress and tangent stiffness tensors,which are then upscaled to govern the localization at the macrolevel.The C^1 continuity finite element employing a modified case of Mindlin’s form II strain energy density is derived for the softening analysis.To the authors’knowledge,the finite element discretization based on the strain gradient theory is applied for the modeling of damage evolution at the microstructural level for heterogeneous materials for the first time.The advantage of the novel C1 finite element formulation in comparison with the standard finite element discretization in terms of the regularization efficiency as well as the objectivity has been shown.An isotropic damage law is used for the reduction of the constitutive and nonlocal material behaviour,which is necessary for the physically correct description of the localization formation in quasi-brittle materials.The capabilities of the derived finite element to capture the fully developed localization zones are tested on a random representative volume element(RVE)for several different loading cases.By employing the conventional second-order computational homogenization,the microstructural material constitutive response is averaged over the whole RVE area.In order to model the loss of structural integrity when sharp localization is formed across RVE,the specific conditions which detect a completely formed localization zone are developed.A new failure criterion at the microstructural level has been proposed.The derived finite element formulation,as well as the multiscale damage algorithm,are implemented into the finite element program ABAQUS.The capabilities of the presented multiscale scheme to capture the effects of the deformation localization are demonstrated by few benchmark numerical examples. 展开更多
关键词 Multiscale analysis second-order computational homogenization damage,C1 continuity finite element quasi-brittle material
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Multiscale Nonlinear Thermo-Mechanical Coupling Analysis of Composite Structures with Quasi-Periodic Properties 认领 引用 被引量：2
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作者 Zihao Yang Liang Ma +4 位作者 Qiang Ma Junzhi Cui Yufeng Nie Hao Dong Xiaohong An 《Computers, Materials & Continua》 SCIE EI 2017年第3期219-248,共30页
This paper reports a multiscale analysis method to predict the thermomechanical coupling performance of composite structures with quasi-periodic properties.In these material structures,the configurations are periodic,... This paper reports a multiscale analysis method to predict the thermomechanical coupling performance of composite structures with quasi-periodic properties.In these material structures,the configurations are periodic,and the material coefficients are quasi-periodic,i.e.,they depend not only on the microscale information but also on the macro location.Also,a mutual interaction between displacement and temperature fields is considered in the problem,which is our particular interest in this study.The multiscale asymptotic expansions of the temperature and displacement fields are constructed and associated error estimation in nearly pointwise sense is presented.Then,a finite element-difference algorithm based on the multiscale analysis method is brought forward in detail.Finally,some numerical examples are given.And the numerical results show that the multiscale method presented in this paper is effective and reliable to study the nonlinear thermo-mechanical coupling problem of composite structures with quasiperiodic properties. 展开更多
关键词 Thermo-mechanical coupling problem quasi-periodic properties multiscale asymptotic analysis multiscale finite element-difference algorithm
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Microstructural Modeling and Multiscale Mechanical Properties Analysis of Cancellous Bone 认领 引用
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作者 Zhiqiang Huang Yufeng Nie Yiqiang Li 《Computers, Materials & Continua》 SCIE EI 2020年第1期245-265,共21页
This paper is devoted to the microstructure geometric modeling and mechanical properties computation of cancellous bone.The microstructure of the cancellous bone determines its mechanical properties and a precise geom... This paper is devoted to the microstructure geometric modeling and mechanical properties computation of cancellous bone.The microstructure of the cancellous bone determines its mechanical properties and a precise geometric modeling of this structure is important to predict the material properties.Based on the microscopic observation,a new microstructural unit cell model is established by introducing the Schwarz surface in this paper.And this model is very close to the real microstructure and satisfies the main biological characteristics of cancellous bone.By using the unit cell model,the multiscale analysis method is newly applied to predict the mechanical properties of cancellous bone.The effective stiffness parameters are calculated by the up-scaling multi-scale analysis.And the distribution of microscopic stress in cancellous bone is determined through the down-scaling procedure.In addition,the effect of porosity on the stiffness parameters is also investigated.The predictive mechanical properties are in good agreement with the available experimental results,which verifies the applicability of the proposed unit cell model and the validness of the multiscale analysis method to predict the mechanical properties of cancellous bone. 展开更多
关键词 Cancellous bone microstructural modeling multiscale analysis stiffness parameters stress distribution
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The spatial multiscale variability of heavy metals based on factorial kriging analysis: A case study in the northeastern Beibu Gulf 认领 引用 被引量：5
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作者 ZHAO Jianru CHU Fengyou +4 位作者 JIN Xianglong WU Qingsong YANG Kehong GE Qian JIN Lu 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2015年第12期137-146,共10页
Factorial kriging analysis is applied to the research on the spatial multiscale variability of heavy metals in submarine. It is used to analyze the multiscale spatial structures of seven heavy metals, Ni, Cu, Zn, Pb, ... Factorial kriging analysis is applied to the research on the spatial multiscale variability of heavy metals in submarine. It is used to analyze the multiscale spatial structures of seven heavy metals, Ni, Cu, Zn, Pb, Cr, As and Cd in the surface sediment from the northeastern of Beibu Gulf, identify and separate spatial variations at different scales of heavy metals, and discuss the provenance of heavy metals and the influencing factors. The results show that the existence of three-scale spatial variations those consist of nugget effect, a spherical structure with range of 30 km（short-range scale） and a spherical structure with range of 140 km（long-range scale） in the linear model of coregionalization fitted. The spatial distribution features of seven heavy metals at short-range scale reflect ＂spot-like＂ or ＂stripe-like＂ local-scale spatial variations; the spatial distribution features of the seven heavy metals at long-range scale represent ＂slice-like＂ regional-scale spatial variations. At local scale, Zn, Cr, Ni,Cu, Pb and Cd are derived primarily from parent materials of Hainan Island, Leizhou Peninsula and Guangxi land, whose spatial distribution characteristics are controlled by granularity of sediments, while As is influenced dominantly by human pollution components from Hainan Island and Leizhou Peninsula. At regional scale, Zn,Cr, Ni and Cu originate primarily from parent rock materials of Leizhou Peninsula and Hainan Island, secondly from Guangxi land; As originated primarily from parent rock materials from Hainan Island, secondly from Leizhou Peninsula and Guangxi land. These metals are transported and migrated with sediments dominated by the anticlockwise circulation of Beibu Gulf year-round, deposited in ＂convergence center＂, forming the whole sedimentary pattern in direction of NWW-NNW at regional scale. The difference in distribution type between As and other metals at regional scale is mainly due to their different geochemical behavior. 展开更多
关键词 spatial multiscale variability heavy metals factorial kriging analysis sediments northeastern Beibu Gulf
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A multiscale 3D finite element analysis of fluid/solute transport in mechanically loaded bone 认领 引用 被引量：6
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作者 Lixia Fan Shaopeng Pei +1 位作者 X Lucas Lu Liyun Wang 《Bone Research》 SCIE CAS CSCD 2016年第3期154-163,共10页
The transport of fluid, nutrients, and signaling molecules in the bone lacunar-canalicular system （LCS） is critical for osteocyte survival and function. We have applied the fluorescence recovery after photobleaching... The transport of fluid, nutrients, and signaling molecules in the bone lacunar-canalicular system （LCS） is critical for osteocyte survival and function. We have applied the fluorescence recovery after photobleaching （FRAP） approach to quantify load-induced fluid and solute transport in the LCS in situ, but the measurements were limited to cortical regions 30-50 μm underneath the periosteum due to the constrains of laser penetration. With this work, we aimed to expand our understanding of load-induced fluid and solute transport in both trabecular and cortical bone using a multiscaled image-based finite element analysis （FEA） approach. An intact murine tibia was first re-constructed from microCT images into a three-dimensional （3D） linear elastic FEA model, and the matrix deformations at various locations were calculated under axial loading. A segment of the above 3D model was then imported to the biphasic poroelasticity analysis platform （FEBio） to predict load-induced fluid pressure fields, and interstitial solute/fluid flows through LCS in both cortical and trabecular regions. Further, secondary flow effects such as the shear stress and/or drag force acting on osteocytes, the presumed mechano-sensors in bone, were derived using the previously developed ultrastructural model of Brinkman flow in the canaliculi. The material properties assumed in the FEA models were validated against previously obtained strain and FRAP transport data measured on the cortical cortex. Our results demonstrated the feasibility of this computational approach in estimating the fluid flux in the LCS and the cellular stimulation forces （shear and drag forces） for osteocytes in any cortical and trabecular bone locations, allowing further studies of how the activation of osteocytes correlates with in vivo functional bone formation. The study provides a promising platform to reveal potential cellular mechanisms underlying the anabolic power of exercises and physical activities in treating patients with skeletal deficiencies. 展开更多
关键词 A multiscale 3D finite element analysis of fluid/solute transport in mechanically loaded bone Figure
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Elastoplastic mechanical behaviors and quench characteristics of high-field Nb3Sn solenoid magnet with progressive damage model 认领 引用
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作者 Qing-Yu Wang Kai-Wei Cao +1 位作者 Shuai Hu Cun Xue 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第2期610-627,共18页
Due to the high critical current density Jc,Nb3Sn becomes the promising candidate for future high-field magnets.Unfortunately,especially at high fields,mechanical loads such as Lorentz force and thermal stress c... Due to the high critical current density Jc,Nb3Sn becomes the promising candidate for future high-field magnets.Unfortunately,especially at high fields,mechanical loads such as Lorentz force and thermal stress can lead to damages,critical property degradations,and even quench.It has long plagued high-Jc Nb3Sn wire at the core of high-field magnets,and seriously threaten applications of Nb3Sn magnets.In this paper,we introduce a multiscale nonlinear mechanical model coupled with progressive damage effects,thermal,and electromagnetic fields to simulate the multi-physics behaviors of superconducting magnets.This model is validated by conducting comparisons with uniaxial tensile experiments of multi-filamentary Nb3Sn wires and further measurements conducted on Nb3Sn solenoid magnets.Leveraging this model,we investigate the nonlinear mechanical response of Nb3Sn solenoid during preloading,cooling down,and current ramping process.There exist obvious mechanical property deteriorations caused by filament damages and plastic deformation of Copper matrix at high fields.Remarkably,mechanical reaction results in significant degradation of quench current threshold,and changes the quench propagation path.The current margin of Nb3Sn solenoid of FECR(first 4th generation electron cyclotron resonance ion source)magnet versus transport current with consideration of strain sensitivities of Jc has been illustrated.These findings pave the way for analysis of elastoplastic damage behaviors and quench characteristics of superconducting solenoid magnet wounded by multi-filamentary wires. 展开更多
关键词 Nb3Sn solenoid magnets Mechanical-electromagnetic-thermal coupling Multiscale analysis Anisotropic elastoplastic damage behavior Mechanical reaction Quench characteristics
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To see and to know:the power of live imaging in illuminating and decoding biological complexity 认领 引用
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作者 Miaoling Yang Zhuo Du 《Journal of Genetics and Genomics》 SCIE CAS CSCD 2026年第3期361-380,共20页
Live imaging enables direct observation of dynamic biological processes,capturing their progression from molecular to organismal scales in space and time.Through high-resolution observation,it provides a powerful mean... Live imaging enables direct observation of dynamic biological processes,capturing their progression from molecular to organismal scales in space and time.Through high-resolution observation,it provides a powerful means to decode biological complexity by revealing dynamic behaviors,spatial patterns,and regulatory changes.This review illustrates the application of live imaging in investigating complex biological processes with spatiotemporal resolution and mechanistic insight.We first highlight the analytical power and integrative strategies of live imaging,and then summarize recent advances that further extend its capacities.We then focus on four complex processes―cell proliferation,lineage regulation,morphogenesis,and atlas construction―to elucidate how live imaging contributes to their decoding through representative studies.We also discuss the conceptual and practical limitations that currently constrain the full interpretive potential of live imaging,underscoring the need for deeper integration between observation,perturbation,and modeling.Looking ahead,live imaging will benefit from both technical refinement and advances in data standardization and visualization,functional quantification,multiscale integration,and the discovery of generalizable principles.Together,these directions advance a more integrative and mechanistic understanding of complex biological processes. 展开更多
关键词 Live imaging Single-cell quantification Multiscale analysis Cell proliferation Cell lineage Morphogenesis Biological atlas
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Numerical Simulation of Dynamic Response of Fiber Reinforced Ceramic Matrix Composite Beam with Matrix Cracks Using Multiscale Modeling 认领 引用 被引量：3
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作者 高希光 宋迎东 +1 位作者 孙志刚 胡绪腾 《Chinese Journal of Aeronautics》 SCIE EI CAS 2010年第5期537-548,共12页
A multiscale method for simulating the dynamic response of ceramic matrix composite （CMC） with matrix cracks is developed. At the global level, the finite element method is employed to simulate the dynamic response ... A multiscale method for simulating the dynamic response of ceramic matrix composite （CMC） with matrix cracks is developed. At the global level, the finite element method is employed to simulate the dynamic response of a CMC beam. While at the local level, the multiscale mechanical method is used to estimate the stress/strain response of the material. A distributed computing system is developed to speed up the simulation. The simulation of dynamic response of a Nicalon/CAS-II beam being subjected to harmonic loading is performed as a numerical example. The results show that both the stress/strain responses under tension and compressive loading are nonlinear. These conditions result in a different response compared with that of elastic beam, such as： 1） the displacement response is not symmetric about the axis of time; 2） in the condition of small external load, the response at first order natural frequency is limited within a finite range; 3） decreasing the matrix crack space will increase the displace- ment response of the beam. 展开更多
关键词 ceramic matrix composite dynamic analysis vibration analysis multiscale analysis matrix crack interface debonding
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A spillover network analysis of the global crude oil market:Evidence from the post-financial crisis era 认领 引用 被引量：4
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作者 Zhi-Yi Ouyang Zheng Qin +3 位作者 Hong Cao Tian-Yu Xie Xing-Yu Dai Qun-Wei Wang 《Petroleum Science》 SCIE EI CAS CSCD 2021年第4期1256-1269,共14页
The frequent occurrence of geopolitical crises in the post-financial crisis era is driving the rethinking behind whether the global crude oil market is still a highly connected"great pool".Using the spillove... The frequent occurrence of geopolitical crises in the post-financial crisis era is driving the rethinking behind whether the global crude oil market is still a highly connected"great pool".Using the spillover network model suggested by Baruník and Krehlík(2018),and the daily data of 31 global crude oil markets from 2009 to 2019,this study examines the return and volatility spillover effects and their timevarying behavior in six crude oil market segments at different timescales.The findings indicate that heterogeneity exists in the co-movements between global crude oil markets in the post-financial crisis era.In the medium term,both return and volatility spillover effects are not significant,which makes the diversified portfolio strategy useful.Prices in the Europe and Central Asian regions take the lead in return spillovers.In contrast,Asia-Pacific regional prices contribute the most in terms of volatility spillovers.Long-term volatility spillovers increase sharply when confronted with oil-related events in the postfinancial crisis era.Therefore,policymakers should take effective measures to prevent any large-scale risk transmission in the long run. 展开更多
关键词 Oil price Network analysis Spillover effect Multiscale analysis Baruník and Krehlík model
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