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Coalbed methane(CBM)well performance:A new methodology combining IPR and VLP analysis 认领 引用
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作者 Rajeev Upadhyay Rachit Kumar +3 位作者 Adarsh Kumar Gourav Mobarsha Raj Kiran Vinay Kumar Rajak 《International Journal of Coal Science & Technology》 SCIE EI CAS CSCD 2026年第1期291-314,共24页
Unlike conventional gas reservoirs where gas saturation exists at its maximum value initially,coalbed methane(CBM)reservoirs are unique in a way that gas saturation in reservoir starts from zero and builds up to reach... Unlike conventional gas reservoirs where gas saturation exists at its maximum value initially,coalbed methane(CBM)reservoirs are unique in a way that gas saturation in reservoir starts from zero and builds up to reach a peak value as the adsorbed gas in the coal matrix desorbs into the coal cleat system due to depressurization of coal reservoirs through CBM wells.In comparison to conventional gas wells,the increase in gas saturation with pressure depletion is multifold in CBM reservoirs,thus leading to the gas relative permeability dominate the CBM well performance.Moreover,cleat porosity and permeability of coal also dynamically change with pressure depletion.Given these subsurface phenomena,the Inflow Performance Relationship(IPR)of CBM wells involves additional complexities,thus making conventional IPR methods unsuitable for CBM wells.Similarly,the vertical lift performance(VLP)of CBM wells also differs from that of conventional oil and gas wells,given the typical CBM well configuration where gas is produced through the annulus and water is pumped through tubing.The flowing bottom hole pressure(FBHP)calculations for CBM wells involve additional parameters,such as depth of the water level in the annulus,the water-gas-ratio,the casing ID,and the tubing OD.In this context,the VLP of CBM wells entails further intricacies that are not captured in conventional methods of VLP generation.In this paper,for the first time,a mathematical model is developed,and a computational approach is propounded to construct the VLP of CBM wells.A mathematical model and process workflow have been defined for generating IPR of CBM wells considering the dynamic changes in cleat permeability and phase relative permeabilities with pressure depletion.The process workflow has been defined to integrate the IPR and VLP of CBM wells to determine the optimal operating point.The study shows that the VLP of CBM wells,unlike that of conventional gas wells,displays a decreasing trend in the FBHP with increasing surface gas rate.The study also reveals that the gas-phase IPR of CBM wells is driven mainly by the variation of krg/μgBg with pressure depletion.The results of the mathematical model have been validated with ugBg in-field production data from a CBM well. 展开更多
关键词 Inflow Performance Relationship(IPR)of CBM Wells Vertical Lift Performance(VLP)of CBM Wells:Tubing Intake Curve of CBM Wells CBM Well Performance Matrix Shrinkage Dynamic Relative Permeability CBM well production optimization
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Experimental evaluation of high performance concrete cladding based on shaking table tests 认领 引用
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作者 Wang Yanhua Zhang Mingzhou +2 位作者 He Junze Jin Yihan Xu Yang 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2026年第1期111-122,共12页
Severe failures of nonstructural components have occurred during previous earthquakes.Claddings are one of the most widely used nonstructural component and are installed in many modern buildings;therefore,an evaluatio... Severe failures of nonstructural components have occurred during previous earthquakes.Claddings are one of the most widely used nonstructural component and are installed in many modern buildings;therefore,an evaluation of their seismic performance is important and cannot be ignored.To investigate the seismic performance of large-sized high performance concrete cladding(HPCC),a series of full-scale experimental tests were conducted using a unidirectional shaking table.A steel supporting frame was used to install the HPCCs and reproduce the effects of the building under earthquake.The tests were divided into two parts:in-plane(IP)testing and out-plane(OP)testing.Three recorded accelerograms,one artificial accelerogram,and one sinusoidal accelerogram were used to conduct the shaking table tests.The results show that the maximum recorded IP responses of acceleration and interstory drift ratio were 1.04 g and 1/97,while the OP responses were 1.02 g and 1/51.The HPCCs functioned well throughout the entire experimental protocol.The fundamental frequency of the HPCCs systems rarely changed after the tests. 展开更多
关键词 nonstructural components high performance concrete cladding seismic performance shaking table tests
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Influence of Different Fibers on the Bonding Performance between Recycled Aggregate Concrete and Steel Bars 认领 引用
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作者 Hongmei Chen Ronggui Liu +1 位作者 Feifei Jiang Hsing-Wei Tai 《Structural Durability & Health Monitoring》 EI 2026年第4期326-345,共20页
This paper analyzes the influence of different fibers(polypropylene fibers and basalt fibers)and fiber contents(0%-0.20%)on the bonding performance between recycled coarse aggregate concrete and steel bars.The results... This paper analyzes the influence of different fibers(polypropylene fibers and basalt fibers)and fiber contents(0%-0.20%)on the bonding performance between recycled coarse aggregate concrete and steel bars.The results show that the addition of recycled aggregates can reduce the fluidity of concrete,whereas the addition of fibers can further reduce the fluidity of concrete.The addition of fibers can effectively improve the mechanical properties of concrete(polypropylene fiber can increase compressive strength and splitting tensile strength by 7.80% and 6.09%,respectively,while basalt fiber can increase compressive strength and splitting tensile strength by 8.78% and 8.31%,respectively),but excessive fiber content can actually reduce the mechanical properties of concrete.The addition of fibers can enhance the bond strength between recycled concrete and steel bars and limit the relative slip between recycled concrete and steel bars,thereby improving the bond performance.The improvement effect of basalt fibers on the mechanical and bonding properties of recycled concrete is superior to that of polypropylene fibers.The correlation between the bond strength between fiber-reinforced recycled concrete and steel bars and the splitting tensile strength of recycled concrete is better,and a calculation model for the bond strength between fiber-reinforced recycled concrete and steel bars is constructed on the basis of the splitting tensile strength as the mechanical performance index.This study can provide a basis for the application of fiber-reinforced recycled concrete technology in engineering. 展开更多
关键词 Recycled aggregate concrete basalt fiber polypropylene fiber mechanical performance bonding performance
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Dietary glycyrrhizin enhances reproductive performance by improving intestinal microbiota,liver lipid metabolism and ovarian senescence in aged breeder hens 认领 引用 被引量：1
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作者 Zhenwu Huang Huchuan Liu +5 位作者 Guangju Wang Huan Ge Yanru Shi Jinghai Feng Chunmei Li Minhong Zhang 《Journal of Animal Science and Biotechnology》 SCIE CAS CSCD 2026年第1期299-317,共19页
Background The decline in reproductive performance of aged hens is mainly attributed to oxidative damage in reproductive organs,hepatic lipid metabolism disorders,and intestinal microbiota dysbiosis.Glycyrrhizin(GL)ha... Background The decline in reproductive performance of aged hens is mainly attributed to oxidative damage in reproductive organs,hepatic lipid metabolism disorders,and intestinal microbiota dysbiosis.Glycyrrhizin(GL)has been proven to enhance antioxidant capacity,regulate lipid metabolism and gut microbiota in mammals,but its efficacy in hens remains unclear.Hence,this study aimed to investigate whether dietary GL supplementation improves reproductive performance in hens during the late laying stage by modulating intestinal microbiota composition,hepatic lipid metabolism and ovarian antioxidant status.Results Dietary supplementation with 100 mg/kg GL significantly improved the egg production rate,egg quality,and hatching rate in aged breeder hens(P<0.05).GL supplementation also increased the serum levels of HDLC,TP and ALB,and enhanced the antioxidant capacity in both serum and ovary(P<0.05).In addition,dietary GL elevated the serum progesterone(P4)levels by enhancing the transcription level of steroid synthesis key enzymes(CYP11A1 and 3β-HSD)in the ovary(P<0.05).Dietary GL also promoted the synthesis and transport of vitellogenin(VTG)by upregulating the VTG-Ⅱ(P<0.05)and APOV1(P=0.077)expression levels in the liver,thereby increasing the number of grade follicles and small yellow follicles.Moreover,dietary GL enhanced hepatic fatty acidβ-oxidation by upregulating PPARαand CPT-I(P<0.05),and downregulating ACC expression levels(P<0.05).In agreement,liver metabolomics analysis revealed that dietary GL supplementation significantly altered hepatic metabolism,with 389 differentially identified metabolites(P<0.05).The key metabolites(e.g.,taurocholic acid,tauroursodeoxycholic acid,nicotinuric acid,glycodeoxycholic acid(hydrate))were identified,and they were mainly functionally enriched in betaalanine metabolism nicotinate,taurine and hypotaurine metabolism(P<0.05).Finally,16S rRNA gene sequencing revealed that dietary GL reversed age-induced changes in gut microbiota composition,characterized by a significant increase in Lactobacillus abundance and a decrease in Bacteroides(P<0.05).Conclusions These results collectively demonstrate that dietary supplementation with 100 mg/kg GL improved reproductive performance by reversing age-induced changes in gut microbiota,enhancing hepatic vitellogenin synthesis,and ameliorating ovarian function in aged breeder hens.This study suggests that dietary GL is a potential strategy to improve reproductive performance in broiler breeder hens during the late laying period. 展开更多
关键词 Aged breeder hen Glycyrrhizin Gut microbiota Lipid metabolism Reproductive performance
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Surface morphology and grinding performance of metal-bonded diamond grinding wheels sharpened by microwave discharge 认领 引用 被引量：1
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作者 Jiaying Yan Zijin Yao +2 位作者 Shichun Li Zhi Yang Tao Liu 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2026年第1期384-394,共11页
While microwave(MW)discharge technology has been developed to address the challenges inherent in shar-pening metal-bonded diamond grinding wheels(MD-GW),the surface morphology and grinding performance characteristics ... While microwave(MW)discharge technology has been developed to address the challenges inherent in shar-pening metal-bonded diamond grinding wheels(MD-GW),the surface morphology and grinding performance characteristics of wheels processed through this method remain insufficiently characterized and warrant further investigation.This study employed an in-situ experimental setup to analyze MD-GW sharpened through MW discharge,with a focus on abrasive damage,grit protrusion height and uniformity,the number of effective abrasives,chip space,and bond morphology.The grinding performance of MW-sharpened MD-GW was assessed based on dynamic grinding ratios and surface quality in zirconia grinding experiments,using mechanical sharpening as the comparison group.The results revealed that MW sharpening enhanced abrasive integrity when compared to mechanical methods,albeit with minor graphitization and localized oxidative damage occurring.Furthermore,after being sharpened by the MW method,the grit protrusion height increased,demonstrating good uniformity,and simultaneously exhibiting a higher number of effective abrasives.Noticeable craters formed in proximity to the abrasives,augmenting chip space,but sputtering led to the formation of metal deposition layers on the abrasive surfaces.The MW-sharpened wheel exhibited superior grinding wear ratios,with dynamic grinding ratios initially increasing and subsequently decreasing as the grinding process pro-gressed.These enhancements in surface morphology allowed the MW-sharpened MD-GW to remove zirconia ceramics in a ductile manner,resulting in improved grinding surface quality.The importance of this study lies in the development of an innovative sharpening technique that improved the surface morphology quality of MD-GW,with potential ramifications for enhancing the efficiency and quality of grinding difficult-to-machine materials. 展开更多
关键词 Microwave Sharpening Metal-bond diamond grinding wheel Grinding wheel morphology Grinding performance
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Memristor devices for next-generation computing:from performance optimization to application-specific co-design 认领 引用 被引量：1
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作者 Zhaorui Liu Caifang Gao +5 位作者 Jingbo Yang Zuxin Chen Enlong Li Jun Li Mengjiao Li Jianhua Zhang 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2026年第1期119-146,共28页
Memristors have emerged as a transformative technology in the realm of electronic devices,offering unique advantages such as fast switching speeds,low power consumption,and the ability to sensor-memory-compute.The app... Memristors have emerged as a transformative technology in the realm of electronic devices,offering unique advantages such as fast switching speeds,low power consumption,and the ability to sensor-memory-compute.The applications span across non-volatile memory,neuromorphic computing,hardware security,and beyond,prompting memristors to become a versatile solution for next-generation computing and data storage systems.Despite enormous potential of memristors,the transition from laboratory prototypes to large-scale applications is challenging in terms of material stability,device reproducibility,and array scalability.This review systematically explores recent advancements in high-performance memristor technologies,focusing on performance enhancement strategies through material engineering,structural design,pulse protocol optimization,and algorithm control.We provide an in-depth analysis of key performance metrics tailored to specific applications,including non-volatile memory,neuromorphic computing,and hardware security.Furthermore,we propose a co-design framework that integrates device-level optimizations with operational-level improvements,aiming to bridge the gap between theoretical models and practical implementations. 展开更多
关键词 memristor performance optimization device design neuromorphic computing
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ATLAS study:Design,athletic performance,and sex-specific regression models for muscle strength in the Greek population 认领 引用
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作者 Natia A.Pogosova Despoina Brekou +7 位作者 Ioanna E.Gavra Efthymia A.Katsareli Eleni More Panagiotis G.Symianakis Maria Kafyra Ioanna Panagiota Kalafati Giannis Arnaoutis George V.Dedoussis 《Sports Medicine and Health Science》 CAS CSCD 2026年第1期79-95,共17页
Purpose:ATLAS is a cross-sectional study aiming to investigate environmental and genetic determinants of athletic performance in healthy Greek competitive athletes(CA).This article presents the study design,investigat... Purpose:ATLAS is a cross-sectional study aiming to investigate environmental and genetic determinants of athletic performance in healthy Greek competitive athletes(CA).This article presents the study design,investigates the muscle strength performance(MSP)of 289 adult and teenage CA,exercisers,and physically inactive individuals(PI),and proposes predictive models of MSP for adults.Methods:Muscle maximal,speed,and explosive strength(MMS/MSS/MES)at unilateral maximal concentric flexion and extension contraction(FC/EC)were evaluated using Biodex System 3 PROTMat 60°/s,180°/s,and 300°/s,while additional performance markers were assessed through field ergometric testing.Participants were interviewed about their lifestyle,dietary habits,physical activity,injury,and medical history.Body composition was assessed via bioelectrical impedance.gDNA was extracted from biochemical samples and then genotyped.Statistical analysis was conducted using IBM SPSS Statistics v21.0 and R.Results:Age,fitness,and sex impacted correlations of MSP with body composition and anthropometric measurements(p<0.05).Among CA,females outperformed males in accuracy(p<0.001)while,males outperformed females in anaerobic power,MSP,speed,and endurance(p<0.001).Adult CA outperformed exercisers and PI in MMS,MSS,and MES(p<0.05).Multiple linear regression models,with predictors age,FFM,body extremity,training load explained the majority of variation in MMS(R2adj:71.4%–88.9%),MSS(R2adj:64.8%–78.4%),and MES(R2adj:52.7%–68.4%)at EC,FC,and their mean(p<0.001).Conclusions:Muscle-strengthening strategies should be customized according to individual fitness levels,body composition,and anthropometric measurements.The innovative sex-specific regression models assessing MMS,MSS,and MES at EC and FC provide a framework for personalizing rehabilitation and skill-specific training strategies. 展开更多
关键词 Athletic performance Isokinetic dynamometer Muscle strength performance Greek population Predictive models Body composition
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Molecular Weight Distribution Effects on the Structural and Mechanical Performance of Conjugated Polymers Incorporating Flexible Spacers:A Simulation Study 认领 引用
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作者 Hai-Yan Weng Ji-Yuan Xing +1 位作者 Rui Shi Zhong-Yuan Lu 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2026年第7期2331-2340,共10页
Conjugated polymers incorporating flexible spacers(CP-FSs)offer a promising route to mechanically robust active layers for flexible organic solar cells.However,the influence of molecular weight distribution(MWD)—a fu... Conjugated polymers incorporating flexible spacers(CP-FSs)offer a promising route to mechanically robust active layers for flexible organic solar cells.However,the influence of molecular weight distribution(MWD)—a fundamental polymer characteristic—on structural and mechanical performance remains poorly understood due to synthetic challenges.Here,we employ dissipative particle dynamics and coarsegrained molecular dynamics simulations to elucidate how MWD,quantified by polydispersity index(PDI),governs structure-property relationships in CP-FSs.Our results reveal that PDI acts as a molecular switch controlling phase morphology:increasing PDI drives transitions from lamellar to perforated lamellar structures at intermediate rigid segment lengths.At the molecular level,higher PDI significantly increases the fraction of bridging conformations(νbridge),strengthening a load-bearing network.During tensile deformation,this enhanced load-bearing network suppresses destructive fibrillation and instead promotes reconstructive strengthening through dynamic loop-to-bridge transitions.These findings demonstrate that controlled MWD offers a composition-independent strategy for developing mechanically robust active layers,providing practical guidelines for flexible organic solar cell design. 展开更多
关键词 Conjugated polymers incorporating flexible spacers Molecular weight distribution Structural performance Mechanical performance
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Low-carbon solid waste materials for railway sub-ballast layers:a review of mechanical performance,sustainability and regulatory gaps 认领 引用
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作者 Raphael Lúcio Reis dos Santos Conrado de Souza Rodrigues +2 位作者 Flavia Castro de Faria Matheus Basilio Silva Gaia Carla Cristina Faria Silva 《Railway Sciences》 2026年第3期372-395,共24页
Purpose-This paper presents a comprehensive systematic review of low-carbon solid waste materials applied in railway sub-ballast layers,aiming to critically assess their mechanical performance,durability,environmental... Purpose-This paper presents a comprehensive systematic review of low-carbon solid waste materials applied in railway sub-ballast layers,aiming to critically assess their mechanical performance,durability,environmental benefits and regulatory readiness.The study addresses the growing need to decarbonize rail infrastructure while reducing dependence on natural aggregates,positioning sub-ballast as a strategic layer for circular economy implementation in ballasted track systems.Design/methodology/approach-A PRISMA-based systematic review methodology was adopted to identify,screen and analyses peer-reviewed studies published between 2000 and 2025.The final database comprises experimental,numerical and field investigations covering mining residues,steel slags,construction and demolition waste,rubberized composites,alkali-activated materials and other industrial by-products applied to railway sub-ballast.Mechanical behavior under cyclic loading,resilient modulus,permanent deformation,hydraulic performance,durability and environmental indicators were extracted and synthesized.In parallel,an international regulatory analysis was conducted to compare sub-ballast specifications across Europe,North America,Asia-Pacific and Brazil,enabling identification of performance-regulation gaps and barriers to implementation.Findings-The review demonstrates that several low-carbon waste-derived materials exhibit mechanical performance comparable to or exceeding that of conventional granular sub-ballast,particularly in terms of stiffness retention,resistance to permanent deformation and degradation under repeated loading.Steel slags,recycled concrete aggregates,slate waste and rubber-modified blends consistently show favorable resilient behavior and enhanced damping capacity,while certain mining residues and alkali-activated granular systems present promising strength and durability characteristics.Life-cycle evidence indicates substantial reductions in embodied carbon and natural aggregate consumption when these materials are adopted.However,current railway standards remain largely prescriptive and index-based,rarely incorporating cyclic performance criteria or carbon metrics,creating a structural disconnect between scientific evidence and regulatory acceptance.This gap significantly limits large-scale implementation despite growing technical maturity.Originality/value-This study provides the first integrated synthesis focused exclusively on low-carbon solid waste materials for railway sub-ballast,combining mechanical performance,environmental assessment and international regulatory comparison within a unified analytical framework.By explicitly linking laboratory evidence to policy and standardization challenges,the paper advances performance-based pathways for sustainable railway substructure design.The findings offer actionable guidance for infrastructure managers,regulators and researchers seeking to accelerate the transition toward circular,low-carbon rail systems through sub-ballast innovation. 展开更多
关键词 Railway sub-ballast Low-carbon materials Solid waste valorization Cyclic mechanical performance Life-cycle assessment Performance-based standards
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Influences of Nominal Radial Clearance on Lubrication and Dynamic Performances of Bump Air Foil Bearing 认领 引用
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作者 Shuangmin Li Congpeng Shao +1 位作者 Haojie Xu Qi An 《Journal of Harbin Institute of Technology(New Series)》 CAS 2026年第3期32-54,共23页
In the design of air foil bearings,nominal radial clearance is an important parameter that affects bearing performance.To analyze radial clearance influence on bearing lubrication and dynamic performance,a mechanical ... In the design of air foil bearings,nominal radial clearance is an important parameter that affects bearing performance.To analyze radial clearance influence on bearing lubrication and dynamic performance,a mechanical model that simplifies the foil structure as a two-dimensional thin plate finite element model with an elastic support is established using the theory of elasticity.The calculation model comprehensively considers the interactive forces of bumps and the frictions between the top foil and bump foil,as well as between the bump foil and bearing bushing.A flow-solid coupling calculation model is established based on the compressible gas Reynolds equation.By using perturbation methods,the calculation model for bearing dynamic performance is established.The reliability of the model is verified through experiments measuring the friction torque of the bearing.Through a specific case study,the influences of radial clearance and rotational speed on lubrication and dynamic performance are calculated.In addition,the influence of the foil's structural parameters on bearing performances is also studied. 展开更多
关键词 air foil bearing radial clearance fluid⁃solid coupling lubrication performances dynamic performances
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A Feasibility Study of a Comprehensive Evaluation Method for Bridge Static and Dynamic Performance Based on Trend Analysis of Monitoring Data 认领 引用
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作者 Yongjun Lu Zhili Guo +3 位作者 Yongze Ye Xin Liu Yao Jin Xiang Xu 《Structural Durability & Health Monitoring》 EI 2026年第4期118-134,共17页
To fully leverage structural health monitoring data for bridge condition assessment,this study proposes a comprehensive evaluation method that integrates static and dynamic indicators using monitoring data,and demonst... To fully leverage structural health monitoring data for bridge condition assessment,this study proposes a comprehensive evaluation method that integrates static and dynamic indicators using monitoring data,and demonstrates its feasibility through a short-term monitoring-based trend analysis on a newly built bridge.First,based on statistical principles,theWeibull distribution is employed to extract the dead-load component from static monitoring data.Building upon this,a static performance evaluationmethod is established by incorporating spatial uniformity and trend non-uniformity coefficients.Subsequently,spectral analysis is performed on the main girder acceleration data to extract fundamental frequency information and apply temperature correction,establishing a method for assessing the bridge’s dynamic performance.Finally,considering the nonlinear impact of single-indicator deterioration on overall bridge performance,variable weight theory is introduced to construct a static-dynamic integrated assessment model that accounts for indicator equilibrium.Using actual monitoring data from an arch bridge as an example,the bridge’s static,dynamic,and comprehensive scores in the second month after opening were 95.11,96.21,and 95.66,respectively.Over the following months,all scores remained around 94 points with a gradual decline,confirming the bridge’s good condition and the effectiveness of the proposed comprehensive assessment method for shortterm monitoring-based trend analysis.The findings indicate that minor fluctuations in evaluation scores stem from uncertainties in the assessment process,primarily related to traffic randomness,environmental effects,and residual data processing errors.This method enables unified dimensional quantification and trend tracking of a bridge’s static and dynamic performance without requiring bridge closure,providing a quantitative basis for performance comparison and maintenance decision-making during the service phase. 展开更多
关键词 Structural health monitoring static performance dynamic performance dead load effect variableweight theory trend analysis
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Hysteretic Uncertainty and Anomaly Quantification of Reinforced Concrete Beams Strengthened with Carbon Fiber Reinforced Polymer and Ultra-High-Performance Concrete in Thermocyclic Distress 认领 引用
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作者 Ju-Hyung Kim Yail J.Kim 《Engineering》 SCIE EI CSCD 2026年第6期41-54,共14页
Seismic strengthening with carbon fiber reinforced polymer(CFRP)sheets is a proven technique for improving the capacity and ductility of concrete members and has been used worldwide.In this study,the effects of multi-... Seismic strengthening with carbon fiber reinforced polymer(CFRP)sheets is a proven technique for improving the capacity and ductility of concrete members and has been used worldwide.In this study,the effects of multi-hazard loading on the behavior of reinforced concrete beams strengthened with CFRP and ultra-high-performance concrete(UHPC)jackets are investigated.This work is an unprece-dented initiative in the rehabilitation sector.Based on a previously conducted experimental study,where load reversals are performed at elevated temperatures varying from 25 to 175℃,analytical responses are investigated focusing on the performance degradation,uncertainty quantification,hysteresis,and pinch-ing mechanisms of the retrofitted beams.The uncertainty index,which measures the extent of the anom-aly caused by the multi-hazard loading,clarified that the pinching of hysteresis loops during loading processes is the predominant factor causing a loss of energy dissipation capacity in the thermocyclic dis-tress.The development of uncertainty correlated with the degree of drift ratios,demonstrated by the increased uncertainty index of 0.37 at 175℃,and the beam pinching is controlled by the retrofit schemes.The adjusted stiffness of the loops represents the accumulated damage and deformation resis-tance;meanwhile,the evolution of irreversible pinching alters hysteretic configurations in the subse-quent unloading phases.The Eigen hysteretic properties of the beams are extracted to understand the contribution of individual modes to the progression of uncertainties.The first mode dominates the fourth mode by a factor of up to 127.9.Design recommendations are suggested to estimate thermocyclic dam-age in the strengthened beams with performance degradation factors ranging from 1.00 to 0.45,contin-gent upon temperature. 展开更多
关键词 Anomaly detection Carbon fiber reinforced polymer(CFRP) Design recommendations Hysteresis Multi-hazard Performance degradation Pinching Strengthening Thermocyclic loading Ultra-high-performance concrete(UHPC) Uncertainty
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Fabrication and performance evaluation of HMX-based combustible cartridge cases via top-down DLP 3D printing 认领 引用
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作者 Weitao Yang Yan Zhuang +4 位作者 Yuchen Gao Guanghu Yan Wenrong Yan Yuhao Wang Haixia Ma 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第7期261-270,共10页
This study focuses on 3D-printed combustible cartridge cases(CcCs)to address the limitations of traditional mold-based manufacturing in producing high-performance CcCs with complex structures,and verify the feasibilit... This study focuses on 3D-printed combustible cartridge cases(CcCs)to address the limitations of traditional mold-based manufacturing in producing high-performance CcCs with complex structures,and verify the feasibility of 3D printing for this application.The CCCs were fabricated via top-down digital light processing(DLP)using a slurry composed of HMX(solid filler),high-strength photosensi-tive resin(binder),and TPO(photoinitiator,3%of binder mass).The HMX-based combustible cartridge case has a higher force constant,decomposition temperature and is less sensitive to mechanical stimuli,and features a longer cook-off time.Key printing parameters were optimized based on critical exposure energy(Ec=12.68 mJ/cm2)and slurry penetration depth(Dp=0.83 mm):an exposure time of 2 s(ensuring sufficient curing and stable mechanical properties)and a layer thickness of 0.15 mm(≈0.18×Dp,balancing efficiency and strength).Performance tests showed the 3D-printed CCCs had an energy power of 692 J/g,excellent thermal stability(onset decomposition temperature:242.01°C via DSC-TG),and favorable mechanical properties under optimized parameters:tensile strength of 19.54 MPa(comparable to traditional mold-pressed CCCs)and compressive strength of 44.82 MPa(significantly higher than traditional ones),ensuring structural integrity.Trials with a 12.7 mm test gun revealed that loading 12 g single-base propellant into a 3 g 3D-printed CCC achieved a chamber pressure of 224 MPa and projectile velocity of 697 m/s(values comparable to those with 16 g single-base pro-pellant),proving no interference with main propellant energy release.This study validates 3D printing for CCC production and provides insights for parameter selection in vat photopolymerization-based energetic material printing. 展开更多
关键词 Top-down DLP 3D printing Additive manufacturing Combustible cartridge case Performance
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Performance and Modification Mechanism of Polyurethane Semi-prepolymer Modified Asphalt 认领 引用
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作者 XIONG Zijia XU Zhenghong +3 位作者 HONG Jinxiang GONG Minghui CHENG Jinliang ZHANG Lei 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2026年第4期903-915,共13页
A polyurethane semi-prepolymer was introduced as a new modifier for asphalt.The performance of the polyurethane semi-prepolymer-modified asphalt were compared with SBS-modified asphalt.The results of infrared spectros... A polyurethane semi-prepolymer was introduced as a new modifier for asphalt.The performance of the polyurethane semi-prepolymer-modified asphalt were compared with SBS-modified asphalt.The results of infrared spectroscopy and fluorescence microscopy indicate that there is a chemical reaction between the polyurethane semi-prepolymer and the asphalt,while the SBS and the asphalt are physically cross-linked.The dynamic shear rheometer(DSR)tests indicate that the polyurethane semi-prepolymer-modified asphalt exhibits resistance to deformation at high temperatures,remarkable elastic recovery,minimal stress sensitivity,and higher viscosity.However,its low-temperature performance is inferior to that of SBS-modified asphalt.Based on the asphalt mixture rutting test,the study confirms the excellent rutting resistance of polyurethane semi-prepolymer-modified asphalt.Moreover,the three-point beam bending test and semi-circular bending test(SCB)indicate that the low-to-medium temperature cracking resistance of the polyurethane semi-prepolymermodified asphalt mixture is inferior to that of SBS-modified asphalt.Therefore,polyurethane semi-prepolymermodified asphalt exhibits significant application potential in high-temperature regions and on heavy-duty roadways. 展开更多
关键词 asphalt polyurethane semi-prepolymer performance chemical reaction mechanism
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Promote computer vision applications in pig farming scenarios:High-quality dataset,fundamental models,and comparable performance 认领 引用
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作者 Jiangong Li Xiaodan Hu +5 位作者 Ana Lucic Yiqi Wu Isabella C.F.S.Condotta Ryan N.Dilger Narendra Ahuja Angela R.Green-Miller 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2026年第6期2534-2544,共11页
Computer vision is widely recognized as an influential technology in the field of precision management of animals.Emerging studies have demonstrated the potential to improve pig health and welfare through animal surve... Computer vision is widely recognized as an influential technology in the field of precision management of animals.Emerging studies have demonstrated the potential to improve pig health and welfare through animal surveillance systems and computer vision(CV)algorithms.However,the lack of benchmark datasets and robust fundamental algorithms restrict CV applications for the commercial use.This study aims to bridge the gap between technology development and commercial applications in pig farming scenarios by introducing a general-purpose dataset(Pig Life),comparing benchmark performances of foundational CV algorithms and model development workfiows.The Pig Life dataset contains video clips and images(38 short video clips,2K image frames,22K pig instances)across most pig production phases in a typical commercial pig farm:Breeding and Gestation,Farrow to Wean,Weaning&Nursery,and Growth to Finish.Three detection algorithms(Faster R-CNN,Retina Net,Trident Net)and three segmentation algorithms(Mask R-CNN,MVi Tv2,Point Rend)were trained on the Pig Life dataset from scratch.Fine-tuning of pre-trained models(YOLO8-m,Faster-RCNN-r50)and notraining from zero-shot models(CLIP-SAM,Grouddino-HQSAM)were also evaluated to suggest faster CV development workfiows for commercial applications in pig farming.This study emphasizes the necessity of a benchmark dataset for evaluating the robustness of algorithms and identifying the remaining difficulties and challenges across various algorithms.Furthermore,developing CV models from pre-trained algorithms or zero-shot models showed better performance and a faster process,which could reduce barriers when developing high-performance CV products in pig production industry. 展开更多
关键词 PigLife pig recognition benchmark performance transfer learning zero-shot algorithm
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Multi-scale structural engineering and performance enhancement strategies toward advanced lignin-based supercapacitors 认领 引用
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作者 Tong Lei Huijie Wang +5 位作者 Runxian Wang Farzad Seidi Shangru Zhai Chao Liu Gaoyi Han Huining Xiao 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第7期556-579,I0014,共24页
Lignin is a major by-product of industries such as pulping and biomass refining.However,currently,its high-value utilization rate remains extremely low.Owing to its high carbon content and unique natural aromatic stru... Lignin is a major by-product of industries such as pulping and biomass refining.However,currently,its high-value utilization rate remains extremely low.Owing to its high carbon content and unique natural aromatic structure,lignin serves as an ideal biomass-derived precursor for preparing porous carbon electrodes for supercapacitors.Existing relevant reviews are lacking in systematic correlation analysis between the characteristics of lignin precursors and the structural evolution of carbon materials,as well as the systematic sorting of their performance enhancement technologies.Centering on the multi-scale structural engineering of lignin-derived porous carbon electrodes,this review systematically summarizes the key technological advancements in improving their supercapacitive performance.It emphasizes elaborating on the structural and performance differences of porous carbons derived from four types of industrial lignin(lignosulfonate,enzymatic hydrolysis lignin,alkali lignin,and organosolv lignin),as well as the research status and regulation mechanisms of three core technologies,including pore structure regulation,surface modification,and composite strategies.Meanwhile,the current core challenges in this field,such as raw material consistency,the balance between pore structure and conductivity,large-scale production,and the standardization of performance evaluation,are analyzed,and four targeted future development directions are proposed:green synthesis approaches,intelligent structural design,device integration,and full life cycle assessment.This review aims to provide theoretical insights and technical references for the design of high-performance lignin-based supercapacitor electrode materials,thereby promoting the efficient,sustainable,and high-value utilization of industrial lignin resources. 展开更多
关键词 Lignin Supercapacitor Carbon Designing strategy Performance enhancement
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Polynitromethyl high-energy materials with a tricyclic furoxan-oxadiazole scaffold:Synthesis,stability,and detonation performance 认领 引用
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作者 Qi Xue Lexing Xue +6 位作者 Panfeng Wu Fuqiang Bi Lianjie Zhai Jiarong Zhang Kaidi Yang Junlin Zhang Bozhou Wang 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第5期138-148,共11页
Polynitromethyl explosives exhibit outstanding detonation performance,yet their application is significantly hindered by safety concerns.Thus,enhancing the stability of polynitromethyl high-energy density materials(HE... Polynitromethyl explosives exhibit outstanding detonation performance,yet their application is significantly hindered by safety concerns.Thus,enhancing the stability of polynitromethyl high-energy density materials(HEDMs)while maintaining high energy levels is of urgent importance.In this study,a novel tricyclic scaffold combining furoxan and 1,2,4-oxadiazole was successfully constructed.Two new HEDMs,3,4-bis(5-fluorodinitromethyl-1,2,4-oxadiazol-3-yl)furoxan(BOFN-4)and 3,4-bis(5-trinitromethyl-1,2,4-oxadiazol-3-yl)furoxan(BOTN-6),were designed and synthesized by introducing a polynitromethyl energetic group for the first time.Experimental tests and theoretical calculations revealed that BOFN-4possesses a higher thermal decomposition temperature(Td peak:193℃)and lower mechanical sensitivity(IS:8 J,FS:252 N)compared to most reported fluorodinitromethyl-functionalized energetic compounds,while also exhibiting high density(ρ:1.92 g·cm-3,296 K).As a zero-oxygen balance explosive,BOTN-6demonstrated 1.3 times the destructive performance of octogen(HMX)in plasma initiation experiments.These results indicate that the introduction of a tricyclic furoxan-isofurazan scaffold is an effective strategy to overcome the thermal stability and sensitivity limitations of polynitromethyl HEDMs,without compromising their energy levels. 展开更多
关键词 Energetic tricyclic scaffolds Furoxan-isofurazan hybridization Polynitromethyl group Synthesis Energetic performance
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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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In Situ Uniform Lithium Enrichment for Dense,High-Performance LLZO Solid Electrolytes 认领 引用
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作者 Yi-Yang Xiao Juan-Yu Yang +6 位作者 Xiao-Bao Zhang Ning Wang Zhi-Hao Guo Wei-Liang Zeng Cheng-Zong Guo Jun Chen Xiao-Wei Huang 《Rare Metals》 SCIE EI CAS CSCD 2026年第1期545-556,共12页
A major challenge in garnet-type Li7La3Zr2O12(LLZO) system all-solid-state electrolytes is the high porosity that typically remains after sintering,which compromises ionic conductivity and degrades battery... A major challenge in garnet-type Li7La3Zr2O12(LLZO) system all-solid-state electrolytes is the high porosity that typically remains after sintering,which compromises ionic conductivity and degrades battery cycling performance.To address this,we propose an innovative strategy to achieve uniform lithium enrichment on the surface of electrolyte powder particles by controlling the calcination atmosphere.The resulting garnet-type solid-state electrolyte powder features a thin,uniform Li2O-based lithium-rich coating layer that effectively eliminates sintering-induced porosity without introducing impurities(or the second phase) while simultaneously promoting grain fusion and moderate structural amorphization.This synergistic function enhances both ionic conductivity and resistance to lithium filament growth.At 25℃,the Ta-doped LLZO(Ta-LLZO) exhibits an ionic conductivity of 1.12 × 10-3 S cm-1 and supports a critical current density of 1.4 mA cm-2 in symmetric lithium cells.The assembled Li/Ta-LLZO/NCM811 all-solid-state battery achieves a discharge capacity of 163.5 mAh g-1 with 91.4% capacity retention over 120 cycles at 0.3C,along with excellent rate performance.These results significantly outperform those of garnet electrolytes lacking surface treatment or exhibiting nonuniform lithium deposition.This scalable and controllable in situ surface engineering approach effectively addresses the long-standing challenges of porosity and interracial properties in garnet electrolytes,offering a promising pathway toward the commercial deployment of advanced solid-state batteries. 展开更多
关键词 cycling performance garnet electrolyte ionic conductivity lithium-rich porosity
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Frictional Anisotropic Effect of Asymmetric Structure on Flexibility and Protective Performance of Biomimetic Flexible Protection System 认领 引用
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作者 Shuaijun Zhang Pengpeng Bai +6 位作者 Wanyou Yang Jingbo Fang Jingyang Li Xiangli Wen Yu Tian Junqiu Zhang Zhiwu Han 《Journal of Bionic Engineering》 SCIE EI CSCD 2026年第2期963-976,共14页
Soft robots,owing to their ability to undergo continuous large deformations,hold significant promise in fields such as disaster rescue,scientific exploration,and medical healthcare.However,they are prone to damage und... Soft robots,owing to their ability to undergo continuous large deformations,hold significant promise in fields such as disaster rescue,scientific exploration,and medical healthcare.However,they are prone to damage under harsh working conditions,which can negatively impact their operational efficiency.The existing research on the protection of soft robots is very limited.In this study,inspired by the natural armor of the arapaima and the asymmetrical body surface structures of the cobra,a high-performance flexible protective system was designed using a coupled biomimetic approach.An electronic pressure testing machine was used to evaluate the flexibility and protective performance of the biomimetic protection system.The results indicated that the presence of the asymmetric structures can substantially enhance the protection performance of the biomimetic protection system without appreciably compromising its flexibility in the slightest.This is due to the reason that the frictional anisotropic effect of asymmetric structure has varying effects on the interlocking interaction between adjacent scales in bending and compression conditions.This study introduces a novel approach aiming at enhancing the protective performance of flexible protection systems,thus presenting potential applications in soft robotic systems. 展开更多
关键词 Frictional anisotropic Asymmetric structure Biomimetic protection system Flexibility Protective performance
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