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Microscopic time-dependent mechanical behavior of shale derived from nanoindentation 认领 引用
1
作者 Cunbao Li Shilei Zhong +2 位作者 Heping Xie Changtai Zhou Jianjun Hu 《Deep Underground Science and Engineering》 EI CAS CSCD 2026年第1期160-175,共16页
Understanding the microscopic time-dependent mechanical behavior of shale is critical for assessing macroscopic creep and engineering applications.Grid nanoindentation experiments and nanoindentation creep tests were ... Understanding the microscopic time-dependent mechanical behavior of shale is critical for assessing macroscopic creep and engineering applications.Grid nanoindentation experiments and nanoindentation creep tests were systematically conducted to investigate microscopic creep behaviors in shale.The indentation creep displacements and creep rates of the shale's soft,intermediate,and hard phases showed the same evolution patterns.The creep deformation was much higher in the soft phase than in the other two phases.However,the difference in the steady-state creep rates between the three mechanical phases was negligible.A linear relationship was observed between the microscopic contact creep modulus and the microscopic Young's modulus,hardness,creep displacement,and creep rate.The primary mechanism of microscopic creep in shale revealed by the creep strain rate sensitivity parameter was the extension and closure of microcracks.The differences in the microscopic creep parameters derived from the experimental data using the deconvolution methods and representative point methods were evaluated,and the applicability of the two methods was described.The performances of commonly used creep models to predict the microscopic creep behaviors were evaluated.The Burgers model provided the best performance in predicting the steady-state creep deformation and creep rate.The ability of the Mori-Tanaka and Voigt-Reuss-Hill models to derive macroscopic parameters from microscopic mechanical parameters was compared.Both methods provided macroscopic Young's modulus values close to the experimental values;however,neither could predict macroscopic creep parameters based on microscopic creep parameters. 展开更多
关键词 creep models homogenization microscopic creep parameters nanoindentation creep
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Study on the strength deterioration characteristics and microscopic mechanisms of moraine soil under freeze-thaw cycles 认领 引用
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作者 Peng-fei Wang Ming-li Li +3 位作者 Ming Chang Jun-lin Jiang Fan Yang Zhi-qiang Zuo 《Journal of Groundwater Science and Engineering》 2026年第1期15-31,共17页
To investigate the strength degradation characteristics and microscopic damage mechanisms of moraine soil under hydro-thermo-mechanical coupling conditions,a series of X-ray Diffraction(XRD),standard triaxial testing,... To investigate the strength degradation characteristics and microscopic damage mechanisms of moraine soil under hydro-thermo-mechanical coupling conditions,a series of X-ray Diffraction(XRD),standard triaxial testing,Scanning Electron Microscopy(SEM),and Nuclear Magnetic Resonance(NMR)experiments were conducted.The mechanical property degradation laws and evolution characteristics of the microscopic pore structure of moraine soil under Freeze-Thaw(F-T)conditions were revealed.After F-T cycles,the stress-strain curves of moraine soil showed a strain-softening trend.In the early stage of F-T cycles(0–5 cycles),the shear strength and elastic modulus exhibited damage rate of approximately 10.33%±0.8%and 16.60%±1.2%,respectively.In the later stage(10–20 cycles),the strength parameters fluctuated slightly and tended to stabilize.The number of F-T cycles was negatively exponentially correlated with cohesion,while showing only slight fluctuation in the internal friction angle,thereby extending the Mohr-Coulomb strength criterion for moraine soil under F-T cycles.The NMR experiments quantitatively characterized the evolution of the internal pore structure of moraine soil under F-T cycles.As the number of F-T cycles increased,fine and micro pores gradually expanded and merged due to the frost-heaving effect during the water-ice phase transition,forming larger pores.The proportion of large and medium pores increased to 59.55%±2.1%(N=20),while that of fine and micro pores decreased to 40.45%±2.1%(N=20).The evolution of pore structure characteristics was essentially completed in the later stage of F-T cycles(10–20 cycles).This study provides a theoretical foundation and technical support for major engineering construction and disaster prevention in the Qinghai-Xizang Plateau. 展开更多
关键词 Moraine soil in the Qinghai-Xizang Plateau F-T cycle Standard triaxial tests soil strength degradation Mohr-Coulomb criterion Microscopic pore structure
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Investigation into the Effect and Microscopic Mechanism of Retarders on Two-component Backfilling Grout in Shield Engineering 认领 引用
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作者 CAI Hongwei MIN Fanlu +5 位作者 YUAN Rui LI Zhen ZHANG Jianfeng WANG Dengfeng ZHANG Yazhou YAO Zhanhu 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2026年第1期84-95,共12页
To address the issues of short setting time and high bleeding rate of A component,which easily cause pipe plugging and poor grouting performance when a two-component grout is injected synchronously behind the Segmenta... To address the issues of short setting time and high bleeding rate of A component,which easily cause pipe plugging and poor grouting performance when a two-component grout is injected synchronously behind the Segmental Lining,the inorganic retarder sodium pyrophosphate(TSPP)and three organic retarders were added to the A component:sodium citrate(SC),sodium tartrate(ST)and glycerol(GLY).The effect law and microscopic mechanism of viscosity,bleeding rate,setting time,gelling time,compressive strength,and stone rate were investigated.The results revealed that the addition of retarders could enhance the stability and setting time of the A component and increase the gelling time,stone rate,and compressive strength of two-component grout.Among them,the performance of the grout with an SC dosage of 0.1% was superior.The bleeding rate of this grout was reduced to 3.5%,the stone rate of the two-component grout was more than 99%,and the early compressive strength and late compressive strength of this grout were increased by approximately 35% and 7%,respectively.The initial and final setting time of the A component with a TSPP dosage of 0.3% was the longest,which was prolonged to 17 and 26 h,respectively.Microscopic analysis revealed that the four retarders hindered the hydration process of cement through complexation and adsorption,and inhibited the hydration of C3S and the crystallisation of CH.Moreover,they reduced the defects caused by the rapid reaction of water glass and CH on the solid phase structure,enabled the microstructure of the stone body to be denser,and subsequently,enhanced the compressive strength. 展开更多
关键词 backfilling grout two-component grout retarder working performance gelling performance microscopic mechanism
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Experimental study of leakage characteristics and microscopic mechanisms in the sealing plug areas of underground compressed air energy storage caverns 认领 引用
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作者 Zizheng Dang Bing Zhang +4 位作者 Hanpeng Wang Qianzi Du Jianguo Fan Jiancai Sui Zhongzhong Liu 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2026年第5期997-1020,共24页
To investigate the leakage mechanism of the sealing plug area in compressed air energy storage(CAES)caverns under various conditions,the leakage evolution characteristics of the simulated samples were systematically s... To investigate the leakage mechanism of the sealing plug area in compressed air energy storage(CAES)caverns under various conditions,the leakage evolution characteristics of the simulated samples were systematically studied via a self-developed triaxial seepage testing system.Combined with CT scanning,the development and propagation mechanisms of internal defects were elucidated.The results indicate that the leakage index is significantly positively correlated with the peak air pressure and injection rate but negatively correlated with the confining pressure.Leakage behavior during the charging phase is governed primarily by the peak pressure and injection rate,whereas that during the storage phase is predominantly controlled by the pressure magnitude.A distinct time lag,dominated by peak pressure,was identified between the leakage index and pressure characteristic points.The average peak leakage rate exhibited a“decreasing-then-increasing”trend,transitioning from an initial value of 9.3289 to 7.3267 cm3/s and then rebounding to 8.8093 cm3/s.The cyclic process enhanced the connectivity of the pore-fracture network;fracture coalescence reduced the number of large pores(>0.9 mm)but increased the total pore count.This research provides valuable insights for evaluating the sealing performance and rock concrete interface seepage of artificial CAES caverns. 展开更多
关键词 Compressed air energy storage(CAES) Sealing plug Leakage assessment Crack pore coupled leakage mechanism Microscopic defect development
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Structural anisotropy in celery stalks by microscopic MRI and polarized light microscopy 认领 引用
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作者 Sarah Salem Farid Badar +3 位作者 Amanveer Singh Vladimir Sokolovsky Gregory Furman Yang Xia 《Magnetic Resonance Letters》 EI CAS 2026年第2期80-86,共7页
Structural anisotropy of celery stalks was studied using T2 anisotropy in microscopic MRI(μMRI)and supplemented by quantitative polarized light microscopy(PLM)at optical resolutions.Parenchyma,which is the ground ... Structural anisotropy of celery stalks was studied using T2 anisotropy in microscopic MRI(μMRI)and supplemented by quantitative polarized light microscopy(PLM)at optical resolutions.Parenchyma,which is the ground tissue in celery and has a diameter in the range of 50–90μm,was found to have isotropic T2;in contrast,collenchyma,which is the structural part of the ground tissue in celery and has a diameter in the range of 8–12μm,was found to have strong anisotropic T2.Substantial size variations within each porous structure and substantial co-existences of more than one type of structural tissues within a singleμMRI voxel were noticed in the optical images,which can contribute to the less clear anisotropies in the smaller vascular structures(e.g.,phloem(approximately 2–6μm in diameter)and xylem(approximately 5–15μm in diameter)).Celery could be used as a simple plant model to study the relationships between tissue microstructures and nuclear spin relaxation in fibrous and porous specimens. 展开更多
关键词 T2anisotropy Celery Microscopic resolution Polarized light microscopy
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A microscopically assisted limited colectomy mouse model of early colon cancer 认领 引用
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作者 Yu Han Yixin Zhang +1 位作者 Dazhi Gao Xuefeng Zhao 《Animal Models and Experimental Medicine》 CAS CSCD 2026年第5期879-885,共7页
Background:Currently,there is a lack of an adequate rodent model for investigating sur-gical techniques and comprehensive treatment options for patients with colorectal can-cer(CRC).This study presents a mouse model t... Background:Currently,there is a lack of an adequate rodent model for investigating sur-gical techniques and comprehensive treatment options for patients with colorectal can-cer(CRC).This study presents a mouse model that involves the orthotopic implantation of colon cancer,followed by a limited colectomy,with the aim of addressing this issue.Methods:To establish an early colon tumor model,luciferase-tagged CT-26 cells were implanted into the ascending colon wall of BALB/c mice.After a 1-week observation period,a limited colectomy procedure was performed.The progression of cancer and the impact of resection were monitored using bioluminescence imaging.Additionally,both short-term and long-term effects of surgical intervention were assessed.Results:The study demonstrated a 100%success rate(40/40)in establishing the BALB/c mouse model of early colon cancer.The technical success rate of limited colec-tomy was also 100%,with no instances of early mortality or morbidity.After the limited colectomy procedure,none of the animals exhibited any primary tumors,bloody ascites,recurrence or local invasion,intestinal obstruction,lymph node metastasis,peritoneal seeding,or anastomotic leakage.Furthermore,there were no reported deaths during the postresection observation period in animals treated with limited colectomy.Conclusion:In summary,our research group has successfully described a novel and reproducible surgical resection model for colon cancer in mice,which reflects the clinical scenario. 展开更多
关键词 BALB/c mouse early colon cancer microscopically assisted limited colectomy orthotopic model surgery model
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Right biopsy protocol for microscopic colitis:Reduced workload and carbon footprint while maintaining diagnostic accuracy 认领 引用
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作者 Edric Leung Yasir Alshareefy +10 位作者 Conor Costigan Sandeep Sihag Sarah Delaney Sarah O’Donnell Niall Breslin Anthony O’Connor Barbara Ryan Abdul Zaheer Ion Cretu Fintan O’Hara Deirdre McNamara 《World Journal of Gastrointestinal Pharmacology and Therapeutics》 2026年第2期97-104,共8页
BACKGROUND Histological findings of microscopic colitis(MC)are patchy,with potential for missed diagnoses.While guidelines recommend biopsies from the right and left sides of the colon,the optimal approach remains unc... BACKGROUND Histological findings of microscopic colitis(MC)are patchy,with potential for missed diagnoses.While guidelines recommend biopsies from the right and left sides of the colon,the optimal approach remains uncertain.AIM To interrogate diagnostic biopsies in a cohort of patients with confirmed MC with a view to improving biopsy protocols.METHODS We conducted a retrospective study of index colonoscopies in patients with MC over a 14-year period.We recorded demographics,symptoms,total number and location of biopsies,and whether they revealed features of lymphocytic or collagenous colitis.RESULTS A total of 228 index colonoscopies were included:64%(145/228)lymphocytic colitis and 36%(83/228)collagenous colitis.The median age at diagnosis was 60(interquartile range:48-72)years,with 27%(61/228)aged<50 years.Overall,71%(162/228)of the patients were female,similar across subtypes.Males were older at diagnosis than females(62 vs 56,P=0.03).Symptoms were known in 86%of patients(196/228),of whom 98%(192/196)had diarrhea.Among 150 cases with biopsies from the right colon,MC features were present in the right-colon specimens in 100%,with a patchy distribution in only 2%(3/150).In contrast,among 158 cases with biopsies from the left colon,MC features were present in the left-colon specimens in 92%.Among cases with paired right and left biopsies,10%(13/136)had positive right-sided biopsies with negative left-sided biopsies;the converse was never observed.Regarding specimen containers,those from the left colon were more likely to be negative[9%(17/199)vs 2%(4/209),odds ratio:4.79,P=0.0025].CONCLUSION In the era of green endoscopy,our data support a protocol of taking biopsies from at least two sites in the right colon only,processed in a single container. 展开更多
关键词 Microscopic colitis Colon biopsy Biopsy protocol Diagnostic yield Green endoscopy Chronic diarrhea
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Hybrid CO2 thermal system for post-steam heavy oil recovery:Insights from microscopic visualization experiments and molecular dynamics simulations 认领 引用
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作者 Ning Lu Xiaohu Dong +4 位作者 Haitao Wang Huiqing Liu Zhangxin Chen Yu Li Deshang Zeng 《Energy Geoscience》 EI CAS CSCD 2025年第2期233-248,共16页
The hybrid CO2 thermal technique has achieved considerable success globally in extracting residual heavy oil from reserves following a long-term steam stimulation process.Using microscopic visualization experiments... The hybrid CO2 thermal technique has achieved considerable success globally in extracting residual heavy oil from reserves following a long-term steam stimulation process.Using microscopic visualization experiments and molecular dynamics(MD)simulations,this study investigates the microscopic enhanced oil recovery(EOR)mechanisms underlying residual oil removal using hybrid CO2 thermal systems.Based on the experimental models for the occurrence of heavy oil,this study evaluates the performance of hybrid CO2 thermal systems under various conditions using MD simulations.The results demonstrate that introducing CO2 molecules into heavy oil can effectively penetrate and decompose dense aggregates that are originally formed on hydrophobic surfaces.A stable miscible hybrid CO2 thermal system,with a high effective distribution ratio of CO2,proficiently reduces the interaction energies between heavy oil and rock surfaces,as well as within heavy oil.A visualization analysis of the interactions reveals that strong van der Waals(vdW)attractions occur between CO2 and heavy oil molecules,effectively promoting the decomposition and swelling of heavy oil.This unlocks the residual oil on the hydrophobic surfaces.Considering the impacts of temperature and CO2 concentration,an optimal gas-to-steam injection ratio(here,the CO2:steam ratio)ranging between 1:6 and 1:9 is recommended.This study examines the microscopic mechanisms underlying the hybrid CO2 thermal technique at a molecular scale,providing a significant theoretical guide for its expanded application in EOR. 展开更多
关键词 Heavy oil Hybrid CO2thermal system Microscopic visualization experiment Molecular dynamics simulation Microscopic mechanism
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Revealing high-temperature oxidation behavior and structure evolution of SnS:an electron microscopic investigation 认领 引用
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作者 Si-Kang Zheng Zhen-Hua Zhang +8 位作者 Yan-Yan Tao Xiao-Meng Yang Jie Liu Hong-Hui Wang Guang Han Xu Lu Guo-Yu Wang Bin Zhang Xiao-Yuan Zhou 《Rare Metals》 SCIE EI CAS CSCD 2025年第6期4086-4094,共9页
SnS,a well-known van der Waals chalcogenide,is susceptible to oxidation in high-temperature or highhumidity environments,significantly impacting its functional performance and device stability.Conversely,oxidation can... SnS,a well-known van der Waals chalcogenide,is susceptible to oxidation in high-temperature or highhumidity environments,significantly impacting its functional performance and device stability.Conversely,oxidation can be used as an effective strategy for surface engineering,allowing for structure modulation or design,property tuning and application exploration.However,there is currently a gap in understanding the relationship between the oxidation behavior of SnS,the structure of its oxidized surface,and the dependence on oxidation temperature.In this study,we systematically investigated the evolution of SnS surfaces under thermal oxidation using electron microscopy.The microstructure evolution(e.g.,surface structures,phases,defects,and interface)of SnS during high-temperature oxidation has been fully characterized and studied based on cross-sectional samples.Various surface heterostructures were constructed,including SnO2/SnS,SnO2/SnS2/SnS,and SnO2/Sn2S3/SnS,offering significant potential for the surface functionalization of SnS-based systems.Accordingly,oxidation mechanisms at different stages were elucidated based on the detailed and clear picture of microstructures.This research not only deepens our understanding of the fundamental science of SnS oxidation but also provides valuable insights for preventing and developing surface oxidation engineering in SnS and other van der Waals chalcogenides/materials. 展开更多
关键词 SnS Oxidation Heterogeneous surfaces Electron microscopic investigation Formation mechanism
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Microscopic-NPR bolt slurry-anchor interface bonding performance 认领 引用
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作者 TAO Zhigang XI Chuanhao +3 位作者 ZHANG Jin WANG Xiang WANG Huan WANG Jiong 《Journal of Mountain Science》 SCIE CSCD 2025年第5期1832-1847,共16页
The excellent bonding performance between bolt and anchor materials is crucial for controlling the deformation of deep-buried surrounding rock and strengthening the rock and soil mass in the slope.This paper conducted... The excellent bonding performance between bolt and anchor materials is crucial for controlling the deformation of deep-buried surrounding rock and strengthening the rock and soil mass in the slope.This paper conducted an anchoring test and ABAQUS numerical simulation of an anchoring system comprising a micro-NPR(microscopic negative Poisson’s ratio)bolt and cement mortar as the anchoring material.The failure mode of this system and the distribution of average bonding strength,axial force,and shear stress along the anchoring depth were studied.We also evaluated the bonding properties at the micro-NPR(microscopic negative Poisson’s ratio)bolt-cement mortar interface.The findings indicate that the cement mortar is partially spalled from the micro-NPR bolt surface.The average bonding strength at the micro-NPR bolt-cement mortar interface is positively correlated with anchoring length and cement mortar strength.In contrast,it exhibits a negative correlation with bolt diameter.The axial force is generated at the starting point of the anchorage and decreases non-uniformly across the anchoring region.The axial force transfers or diffuses toward the deeper sections of the anchoring segment with increasing loads.The shear stress at the micro-NPR bolt-cement mortar interface exhibits a single-peak pattern,i.e.,it climbs to a peak value and decreases along the anchoring depth.The peak position varies with changes in bolt diameter and anchoring length.By comparison,it is independent of cement mortar strength.The simulated bonding properties of the micro-NPR bolt-cement mortar interface are consistent with experimental results.The findings can provide a reference for engineering applications and anchoring design of micro-NPR. 展开更多
关键词 Microscopic Negative Poisson Ratio Bolt Bond performance Bolt diameter Anchor length Cement mortar strength
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CO2-EOR microscopic mechanism under injection-production coupling technology in low-permeability reservoirs 认领 引用
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作者 Zheng Chen Yu-Liang Su +3 位作者 Lei Li Yong-Mao Hao Wen-Dong Wang Chui-Xian Kong 《Petroleum Science》 SCIE EI CAS CSCD 2025年第2期739-755,共17页
Injection-production coupling(IPC) technology holds substantial potential for boosting oil recovery and enhancing economic efficiency.Despite this potential,discussion on gas injection coupling,especially in relation ... Injection-production coupling(IPC) technology holds substantial potential for boosting oil recovery and enhancing economic efficiency.Despite this potential,discussion on gas injection coupling,especially in relation to microscopic mechanisms,remains relatively sparse.This study utilizes microscopic visualization experiments to investigate the mechanisms of residual oil mobilization under various IPC scenarios,complemented by mechanical analysis at different stages.The research quantitatively assesses the degree of microscopic oil recovery and the distribution of residual oil across different injection-production methods.Findings reveal that during the initial phase of continuous gas injection(CGI),the process closely mimics miscible displacement,gradually transitioning to immiscible displacement as CO2extraction progresses.Compared to CGI,the asynchronous injection-production(AIP) method improved the microscopic oil recovery rate by 6.58%.This enhancement is mainly attributed to significant variations in the pressure field in the AIP method,which facilitate the mobilization of columnar and porous re sidual oil.Furthermo re,the synchronous cycle injection(SCI) method increased microscopic oil recovery by 13.77% and 7.19% compared to CGI and AIP,respectively.In the SCI method,membrane oil displays filame ntary and Karman vo rtex street flow patterns.The dissolved and expanded crude oil te nds to accumulate and grow at the oil-solid interface due to adhesive forces,thereby reducing migration resistance.The study findings provide a theoretical foundation for improving oil recovery in lowpermeability reservoirs. 展开更多
关键词 Low-permeability reservoirs Injection-production coupling Microscopic experimental simulation technology CO2-EOR Mechanical analysis
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Collaborative optimization method for sintering schedule of ternary cathode materials under microscopic coupling constraints 认领 引用
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作者 Jia-yao CHEN Ning CHEN +4 位作者 Hong-zhen LIU Zheng-wei XU Zhi-xing WANG Wei-hua GUI Wen-jie PENG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2025年第11期3902-3918,共17页
A collaborative optimization method for the sintering schedule of ternary cathode materials was proposed under microscopic coupling constraints.An oxygen vacancy concentration prediction model based on microscopic the... A collaborative optimization method for the sintering schedule of ternary cathode materials was proposed under microscopic coupling constraints.An oxygen vacancy concentration prediction model based on microscopic thermodynamics and a growth kinetics model based on neural networks were established.Then,optimization formulations were constructed in three stages to obtain an optimal sintering schedule that minimized energy consumption for different requirements.Simulations demonstrate that the models accurately predict the oxygen vacancy concentrations and grain size,with root mean square errors of approximately 5%and 3%,respectively.Furthermore,the optimized sintering schedule not only meets the required quality standards but also reduces sintering time by 12.31%and keeping temperature by 11.96%.This research provides new insights and methods for the preparation of ternary cathode materials. 展开更多
关键词 ternary cathode materials microscopic thermodynamics oxygen vacancy concentration grain growth sintering schedule optimization
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Unveiling nano-scale chemical inhomogeneity in surface oxide films formed on V-and N-containing martensite stainless steel by synchrotron X-ray photoelectron emission spectroscopy/microscopy and microscopic X-ray absorption spectroscopy 认领 引用
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作者 Xiaoqi Yue Dihao Chen +11 位作者 Anantha Krishnan Isac Lazar Yuran Niu Evangelos Golias Carsten Wiemann Andrei Gloskovskii Christoph Schlueter Arno Jeromin Thomas F.Keller Haijie Tong Sebastian Ejnermark Jinshan Pan 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第2期191-203,共13页
Nano-scale chemical inhomogeneity in surface oxide films formed on a V-and N-containing martensite stainless steel and tempering heating induced changes are investigated by a combination of synchrotron-based hard X-ra... Nano-scale chemical inhomogeneity in surface oxide films formed on a V-and N-containing martensite stainless steel and tempering heating induced changes are investigated by a combination of synchrotron-based hard X-ray Photoelectron emission spectroscopy(HAXPES)and microscopy(HAXPEEM)as well as microscopic X-ray absorption spectroscopy(μ-XAS)techniques.The results reveal the inhomogeneity in the oxide films on the micron-sized Cr2N-and VN-type particles,while the inhomogeneity on the martensite matrix phase exists due to localised formation of nano-sized tempering nitride particles at 600℃.The oxide film formed on Cr2N-type particles is rich in Cr2O3 compared with that on the martensite matrix and VN-type particles.With the increase of tempering temperature,Cr2O3 formation is faster for the oxidation of Cr in the martensite matrix than the oxidation of Cr nitride-rich particles. 展开更多
关键词 Synchrotron X-ray photoelectron emission microscopy Hard X-ray photoelectron emission spectroscopy Synchrotron microscopic X-ray absorption spectroscopy Martensite stainless steel Surface oxide film
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Microscopic Modeling and Failure Mechanism Study of Fiber Reinforced Composites Embedded with Optical Fibers 认领 引用
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作者 Lei Yang Jianfeng Wang +2 位作者 Minjing Liu Chunyu Chen Zhanjun Wu 《Computers, Materials & Continua》 SCIE EI 2025年第7期265-279,共15页
Embedding optical fiber sensors into composite materials offers the advantage of real-time structural monitoring.However,there is an order-of-magnitude difference in diameter between optical fibers and reinforcing fib... Embedding optical fiber sensors into composite materials offers the advantage of real-time structural monitoring.However,there is an order-of-magnitude difference in diameter between optical fibers and reinforcing fibers,and the detailed mechanism of how embedded optical fibers affect the micromechanical behavior and damage failure processes within composite materials remains unclear.This paper presents a micromechanical simulation analysis of composite materials embedded with optical fibers.By constructing representative volume elements(RVEs)with randomly distributed reinforcing fibers,the optical fiber,the matrix,and the interface phase,the micromechanical behavior and damage evolution under transverse tensile and compressive loads are explored.The study finds that the presence of embedded optical fibers significantly influences the initiation and propagation of microscopic damage within the composites.Under transverse tension,the fiber-matrix interface cracks first,followed by plastic cracking in the matrix surrounding the fibers,forming micro-cracks.Eventually,these cracks connect with the debonded areas at the fiber-matrix interface to form a dominant crack that spans the entire model.Under transverse compression,plastic cracking first occurs in the resin surrounding the optical fibers,connecting with the interface debonding areas between the optical fibers and the matrix to form two parallel shear bands.Additionally,it is observed that the strength of the interface between the optical fiber and the matrix critically affects the simulation results.The simulated damage morphologies align closely with those observed using scanning electron microscopy(SEM).These findings offer theoretical insights that can inform the design and fabrication of smart composite materials with embedded optical fiber sensors for advanced structural health monitoring. 展开更多
关键词 Fiber reinforced composites optical fiber microscopic modeling failure mechanism interface
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Ultrabright quantum dots assisted in vivo NIR-II fluorescence microscopic imaging for brain metastases in triple-negative breast cancer 认领 引用
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作者 Yuxiang Gao Chi Zhang +5 位作者 Lijun Zhu Zhong Du Rong Ma Le Guo Nuernisha Alifu Xueliang Zhang 《Journal of Innovative Optical Health Sciences》 SCIE EI CSCD 2025年第3期87-98,共12页
Triple-negative breast cancer (TNBC) is an aggressive and often fatal disease, especially since the brain metastasis of TNBC has been a particularly severe manifestation. However, brain metastasis in TNBC at early sta... Triple-negative breast cancer (TNBC) is an aggressive and often fatal disease, especially since the brain metastasis of TNBC has been a particularly severe manifestation. However, brain metastasis in TNBC at early stages often lacks noticeable symptoms, making it challenging to detect. Near-infrared II (NIR-II) fluorescence microscopic imaging obtains long wavelength, which enables reduced scattering, high spatial resolution and minimal autofluorescence, it is also a favorable imaging method for tumor diagnosis. PbS@CdS quantum dots (QDs) are one of the popular NIR-II fluorescence nanoprobes for well brightness. In this study, NIR-II emissive PbS@CdS QDs were utilized and further encapsulated with thiol-terminated poly(ethylene oxide) (SH-PEG, MW = 5000) to form PbS@CdS@PEG QDs nanoparticles (NPs). The obtained PbS@CdS@PEG QDs NPs were then characterized and further studied in detail. The PbS@CdS@PEG QDs NPs had large absorption spectra, exhibited strong NIR-II fluorescence emission at approximately 1300nm, and possessed good NIR-II fluorescence properties. Then, the mice model of early-stage brain metastases of TNBC was established, and the PbS@CdS@PEG QDs NPs were injected into the tumor-bearing mice for NIR-II fluorescence microscopic bioimaging. The brain vessels and tumors of the living mice were detected with high spatial resolution under the NIR-II fluorescence microscopic imaging system with irradiation of 808nm laser. The tumor tissues were further restricted and prepared as thin slices. The NIR-II fluorescence signals were collected from the tumor slices with high spatial resolution and signal-to-background ratio (SBR). Thus, the PbS@CdS@PEG QDs NPs-assisted NIR-II fluorescence microscopic system can effectively achieve targeting brain metastases of TNBC imaging, offering a novel and promising approach for TNBC-specific diagnosis. 展开更多
关键词 NIR-II fluorescence microscopic imaging in vivo imaging fluorescent nanoprobes PbS@CdS quantum dots
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Microscopic characteristics and microstructure evolution of loess after explosion 认领 引用
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作者 Dong Tang Longsheng Deng +8 位作者 Wen Fan Bo Yu Zhongdong Du Shuhan Shen Jiale Chen Sixuan Wang Rui Liu Fangshu Song Yu Zou 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2025年第11期7380-7396,共17页
The accelerated demand for engineering services has led to the extensive utilization of engineering blasting techniques.Blasting-induced changes in loess microstructure(e.g.particle breakage,pore structure change)dire... The accelerated demand for engineering services has led to the extensive utilization of engineering blasting techniques.Blasting-induced changes in loess microstructure(e.g.particle breakage,pore structure change)directly affect its macroscopic mechanical properties.However,there remains a notable lack of studies on the impact of explosions on loess microstructure and the quantificationof loess microstructure.This study employed micro-computed tomography(μ-CT)technology to examine loess samples extracted from the surrounding area of the explosion cavity,systematically investigating the volume,orientation,and morphological characteristics of particles and pores.The research findings indicated that the explosion caused a break for the particles with a diameter larger than 10μm,and the number of smaller particles increased.Blasting decreased the particle sphericity and orientation angle.The reduction in porosity was primarily attributed to a decrease in the volume of both macropores and mesopores,with a greater reduction in the volume of mesopores.Although the number of micropores increased,the volume change was insignificant.Furthermore,the explosion increased the pore fractal dimension and patch density,suggesting a more complex and fragmented pore structure.Moreover,the pore throat radius and channel length decreased with decreasing distance from the explosion cavity(DEC),indicating that the pore's connectivity reduced.The radius of the blasting cavity was approximately 0.35 m.Additionally,the loess zone surrounding the blasting cavity was divided into failure,plastic,and elastic zones using the DEC=0.2 m and 1.2 m as the boundaries.The impacts of the explosion on loess were mainly within the range of DECless than 1.20 m.The analysis of the traits,patterns,and mechanisms of explosions'impact on the loess's microstructure can provide microscopic insight into the macro-dynamic behavior,assess the impact of explosions on the surrounding loess,and identify the potential geological hazards triggered by blasting,which offers a theoretical foundation for the subsequent engineering design and security measures. 展开更多
关键词 Field explosion test Loess microstructure Variation characteristics and microscopic patterns Micro-computed tomography(μ-CT) scanning
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Microscopic structured light 3D imaging via a scattering lens 认领 引用
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作者 Wenjing Zhao Wei Chang +3 位作者 Youtao Wang Aiping Zhai Fei Liu Dong Wang 《Advanced Photonics Nexus》 CSCD 2025年第6期12-18,共7页
Transforming a scattering medium into a lens for imaging very simple binary objects is possible;however,it remains challenging to image complex grayscale objects,let alone measure 3D continuous distribution objects.He... Transforming a scattering medium into a lens for imaging very simple binary objects is possible;however,it remains challenging to image complex grayscale objects,let alone measure 3D continuous distribution objects.Here,we propose and demonstrate the use of a ground glass diffuser as a scattering lens for imaging complex grayscale fringes,and we employ it to achieve microscopic structured light 3D imaging(MSL3DI).The ubiquitous property of the speckle patterns permits the exploitation of the scattering medium as an ultra-thin scattering lens with a variable focal length and a flexible working distance for microscale object measurement.The method provides a light,flexible,and cost-effective imaging device as an alternative to microscope objectives or telecentric lenses in conventional MSL3DI systems.We experimentally demonstrate that employing a scattering lens allows us to achieve relatively good phase information and robust 3D imaging from depth measurements,yielding measurement accuracy only marginally lower than that of a telecentric lens,typically within approximately 10μm.Furthermore,the scattering lens demonstrates robust performance even when the imaging distance exceeds the typical working distance of a telecentric lens.The proposed method facilitates the application of scattering imaging techniques,providing a more flexible solution for MSL3DI. 展开更多
关键词 3D imaging scattering lens microscopic structured light imaging scattering imaging microscale object measurement.
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Macro-microscopic deformation evolution of thawing frozen fine-grained soil used in heavy-haul railway subgrades in cold regions 认领 引用
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作者 JianBing Chen ShaoJie Liang +3 位作者 YuZhi Zhang XiaoDong Zhu Meng Wang MingTao Jia 《Research in Cold and Arid Regions》 CAS CSCD 2025年第2期97-109,共13页
During the thawing process of a railway subgrade,bidirectional thawing complicates water-heat transfer,leading to serious thaw settlement issues under train loads.Focusing on the severely frozen section of the Shuozho... During the thawing process of a railway subgrade,bidirectional thawing complicates water-heat transfer,leading to serious thaw settlement issues under train loads.Focusing on the severely frozen section of the Shuozhou-Huanghua port heavy-haul railway,this study conducted indoor soil-column laterally-limited compression tests on thawing fine-grained soil specimens to analyze the cumulative deformation during thawing.The deformation evolution was examined from both macroscopic and microscopic perspectives.The test results revealed a sig-nificant increase in the water content at the frozen interlayer during thawing,with minimal thaw settlement under no-load conditions.However,under dynamic loads,the thawing soil exhibited rapid settlement during the initial stages of the process.Increasing the dynamic load amplitude did not result in significant additional thaw settlement compression.Particle image velocimetry revealed substantial thaw settlement and compression at the top of thawing soil.Microscopically,the porosity at the top of the specimens significantly decreased,whereas the porosity in the frozen interlayer remained largely unchanged.Under dynamic loading,the specimens exhibited a concentrated distribution of large pores with scattered smaller pores.The phase change from ice to water,combined with dynamic loading,induced particle movement and expanded the inter-particle pore space,leading to macroscopic thaw settlement and soil compression.The findings can provide a theoretical foundation for maintaining and ensuring the safety of railway subgrades in cold regions. 展开更多
关键词 Thawing soil Heavy-haul railway Thaw settlement and compression Particle image velocimetry Microscopic testing
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Future Manufacturing with AI-Driven Particle Vision Analysis in the Microscopic World 认领 引用
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作者 Guangyao Chen Fengqi You 《Engineering》 SCIE EI CSCD 2025年第9期68-84,共17页
Recent advances in artificial intelligence(AI)have led to the development of sophisticated algorithms that significantly improve image analysis capabilities.This combination of AI and microscopic imaging is transformi... Recent advances in artificial intelligence(AI)have led to the development of sophisticated algorithms that significantly improve image analysis capabilities.This combination of AI and microscopic imaging is transforming the way we interpret and analyze imaging data,simplifying complex tasks and enabling innovative experimental methods previously thought impossible.In smart manufacturing,these improvements are especially impactful,increasing precision and efficiency in production processes.This review examines the convergence of AI with particle image analysis,an area we refer to as“particle vision analysis(PVA).”We offer a detailed overview of how this technology integrates into and impacts various fields within the physical sciences and materials sectors,where it plays a crucial role in both innovation and operational improvements.We explore four key areas of advancement-namely,particle classification,detection,segmentation,and object tracking-along with a look into the emerging field of augmented microscopy.This paper also underscores the vital role of the existing datasets and implementations that support these applications,which provide essential insights and resources that drive continuous research and development in this fast-evolving field.Our thorough analysis aims to outline the transformative potential of AI-driven PVA in improving precision in future manufacturing at the microscopic scale and thereby preparing the ground for significant technological progress and broad industrial applications in nanomanufacturing,biomanufacturing,and pharmaceutical manufacturing.This exploration not only highlights the advantages of integrating AI into conventional manufacturing processes but also anticipates the rise of next-generation smart manufacturing,which is set to revolutionize industry standards and operational practices. 展开更多
关键词 Particle vision analysis AI-driven microscopic imaging Smart manufacturing
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Data-driven predictive model of coal permeability based on microscopic fracture structure characterization 认领 引用 被引量：2
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作者 Tianhao Yan Xiaomeng Xu +4 位作者 Jiafeng Liu Yihuai Zhang Muhammad Arif Xiaowei Xu Qiang Wang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2025年第7期4476-4489,共14页
Accurate prediction of coal reservoir permeability is crucial for engineering applications,including coal mining,coalbed methane(CBM)extraction,and carbon storage in deep unmineable coal seams.Owing to the inherent he... Accurate prediction of coal reservoir permeability is crucial for engineering applications,including coal mining,coalbed methane(CBM)extraction,and carbon storage in deep unmineable coal seams.Owing to the inherent heterogeneity and complex internal structure of coal,a well-established method for predicting permeability based on microscopic fracture structures remains elusive.This paper presents a novel integrated approach that leverages the intrinsic relationship between microscopic fracture structure and permeability to construct a predictive model for coal permeability.The proposed framework encompasses data generation through the integration of three-dimensional(3D)digital core analysis and numerical simulations,followed by data-driven modeling via machine learning(ML)techniques.Key data-driven strategies,including feature selection and hyperparameter tuning,are employed to improve model performance.We propose and evaluate twelve data-driven models,including multilayer perceptron(MLP),random forest(RF),and hybrid methods.The results demonstrate that the ML model based on the RF algorithm achieves the highest accuracy and best generalization capability in predicting permeability.This method enables rapid estimation of coal permeability by inputting two-dimensional(2D)computed tomography images or parameters of the microscopic fracture structure,thereby providing an accurate and efficient means of permeability prediction. 展开更多
关键词 Microscopic fracture structure Lattice Boltzmann method Machine learning Coal permeability Predictive model
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