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Effect of dominant fractures on triaxial behavior of 3D-printed rock analogs with internal fracture networks 认领 引用 被引量：2
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作者 Lishuai Jiang Pimao Li +3 位作者 Xin He Yang Zhao Quansen Wu Ye Zhao 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第2期1390-1412,共23页
Internal structural defects in engineering rock masses vary in size,exhibit complex shapes,and are unevenly distributed.Dominant fractures within a rock mass often play a critical to its mechanical behavior,directly a... Internal structural defects in engineering rock masses vary in size,exhibit complex shapes,and are unevenly distributed.Dominant fractures within a rock mass often play a critical to its mechanical behavior,directly affecting the macromechanical properties and failure modes.These fractures affect the instability and failure of the surrounding rock,significantlyimpacting the overall stability of engineering structures.Herein,sand-powder three-dimensional(3D)printing technology was used to prepare rock-like specimens with internal fracture networks.Triaxial compression testing,post-failure fracture mapping,and fractal dimension analysis of the fracture surfaces were conducted to investigate the effects of dominant fracture angles on the strength and deformation of rocks with internal fracture networks under triaxial stress.The results indicate that the dominant fracture angle has a pronounced effect on the mechanical behavior of rock.With increasing angle,both compressive strength and elastic modulus exhibit an initial decline followed by an increase.Moreover,higher confiningpressure significantlyimproves the compressive strength of fractured rock.This enhancement weakens as the confiningpressure further increases.Moreover,with increasing confiningpressure,the differences between the maximum and minimum values of elastic moduli and lateral strain ratios in fractured rock gradually decrease.Thus,the impact of the dominant fracture angle on rock mass deformation decreases with increasing confiningpressure.This research elucidates the effects of dominant fracture angles on the mechanical and failure properties of complex fractured rock masses and the influenceof the confiningpressure on these relationships.It provides valuable theoretical insights and practical guidance for stability analyses in engineering rock masses. 展开更多
关键词 Sand powder three-dimensional(3D) printing Internal fracture networks Triaxial compression Rock mechanics Fractal dimension
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Combined Fault Tree Analysis and Bayesian Network for Reliability Assessment of Marine Internal Combustion Engine 认领 引用 被引量：1
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作者 Ivana Jovanović Çağlar Karatuğ +1 位作者 Maja Perčić Nikola Vladimir 《哈尔滨工程大学学报（英文版）》 CSCD 2026年第1期239-258,共20页
This paper investigates the reliability of internal marine combustion engines using an integrated approach that combines Fault Tree Analysis(FTA)and Bayesian Networks(BN).FTA provides a structured,top-down method for ... This paper investigates the reliability of internal marine combustion engines using an integrated approach that combines Fault Tree Analysis(FTA)and Bayesian Networks(BN).FTA provides a structured,top-down method for identifying critical failure modes and their root causes,while BN introduces flexibility in probabilistic reasoning,enabling dynamic updates based on new evidence.This dual methodology overcomes the limitations of static FTA models,offering a comprehensive framework for system reliability analysis.Critical failures,including External Leakage(ELU),Failure to Start(FTS),and Overheating(OHE),were identified as key risks.By incorporating redundancy into high-risk components such as pumps and batteries,the likelihood of these failures was significantly reduced.For instance,redundant pumps reduced the probability of ELU by 31.88%,while additional batteries decreased the occurrence of FTS by 36.45%.The results underscore the practical benefits of combining FTA and BN for enhancing system reliability,particularly in maritime applications where operational safety and efficiency are critical.This research provides valuable insights for maintenance planning and highlights the importance of redundancy in critical systems,especially as the industry transitions toward more autonomous vessels. 展开更多
关键词 Fault tree analysis Bayesian network Reliability Redundancy Internal combustion engine
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SWOT observation revealed internal solitary wave characteristic variations in the Lombok Strait 认领 引用 被引量：1
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作者 Xiaochen WANG Jing WANG +1 位作者 Xudong ZHANG Jiaxin LIU 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2026年第1期71-84,共14页
Internal solitary waves(ISWs)are an essential dynamic process in the ocean due to their large amplitude and long propagation distance.Traditional satellite observations provide only twodimensional observations of ocea... Internal solitary waves(ISWs)are an essential dynamic process in the ocean due to their large amplitude and long propagation distance.Traditional satellite observations provide only twodimensional observations of ocean signatures induced by ISWs.The Surface Water and Ocean Topography(SWOT)satellite has drawn significant attention due to its high resolution and threedimensional observation capabilities.SWOT can generate high-precision three-dimensional sea surface topography,capture sea surface undulations,and reveal ISW-related surface oscillations,thus offering a new perspective for studying ISWs.We collected 43 SWOT observations with clear ISW signatures in the Lombok Strait from August 2023 to June 2024.Based on collected data,the ISW imaging characteristics and distributions were analyzed,and the ISW-related sea level anomaly(SLA)data were measured by the SWOT to calculate the ISW amplitude and reveal the amplitude variations during the propagation along the wave crest.The ISW amplitudes generally range between 10 and 100 m,with most ISW amplitudes between 20 and 40 m.By analyzing two consecutive generated ISW packets,we identified the spreading effect along ISW wave crests,which manifests as ISW amplitude decrease with increase in propagation distance,and the amplitude distribution is non-uniform along the wave crest.Further analysis of the propagation paths of the maximum amplitude of ISW moving northward through the Lombok Strait revealed that these maxima are predominantly oriented in northeast direction.Finally,the relationship between the amplitude of ISW and the resulting SLA was analyzed.The Pearson correlation coefficient between these two variables is as high as 0.90,which suggests a strong positive correlation between amplitude and SLA.Furthermore,this relationship is closely related to the water depth,indicating that the three-dimensional sea surface observations provided by SWOT offer crucial observational data for the inversion of amplitudes of ISW. 展开更多
关键词 internal solitary wave(ISW) Surface Water and Ocean Topography(SWOT) amplitude Lombok Strait
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Dynamic response analysis of the liquid-filled cylindrical shell under internal explosion load 认领 引用
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作者 Dian Li Zhenghan Chen +3 位作者 Zhujie Zhao Yongqing Li Hailiang Hou Wenxiao Wang 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第4期357-373,共17页
This study theoretically explored the dynamic response of the liquid-filled cylindrical shell structure experiencing internal explosion shock waves.It analyzed the radial deformation of the liquid-filled cylindrical s... This study theoretically explored the dynamic response of the liquid-filled cylindrical shell structure experiencing internal explosion shock waves.It analyzed the radial deformation of the liquid-filled cylindrical shell structure theoretically.It clarified the protection mechanism of the externally liquid-filled cylindrical shell structure.Based on the improved single-degree-of-freedom system theory,a theoretical model was established via load equivalence and simplification.The radial deformations of unfilled and externally liquid-filled cylindrical shells was investigated under internal explosion shock waves.The influencing factors for structural protection characteristics were explored considering impact load intensity,liquid layer thickness,structural specifications and dimensions,and material properties.The results showed that when the load peak value or the action time was fixed,the maximum radial deformation of the structure increased with the increased load-specific impulse.When the load-specific impulse was fixed,reducing the load peak or extending the loading time decreased the maximum radial deformation of the structure.The protection mechanism of the externally liquid-filled cylindrical shell structure was due to the liquid medium,which acted as an additional mass that con-strained the radial deformation of the structure.The change in liquid layer thickness altered the duration of the liquid's constraint on the radial deformation.The dynamic response of the externally liquid-filled cylindrical shell structure presented three deformation modes,which were determined by the liquid layer thickness,structural specifications,dimensions,and material properties. 展开更多
关键词 SDOF analysis Load equivalence and simplification method Liquid-filled structure Dynamic response Internal explosion load
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Effects of internal parts on burden distribution and segregation in bell-less top blast furnace 认领 引用
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作者 Wang Zeng Ye-Han Fang +6 位作者 Zuo-Bang Chen De-Sheng Zou Guang-Liang Wang Yun-Peng Si Heng Zhou Tian-Xiang Zhang Ming-Yin Kou 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第4期241-255,共15页
As the key equipment connecting the feeding belt to the top of blast furnace,the structure of the hoppers directly affects the burden distribution in blast furnace throat.Therefore,it is of great significance to explo... As the key equipment connecting the feeding belt to the top of blast furnace,the structure of the hoppers directly affects the burden distribution in blast furnace throat.Therefore,it is of great significance to explore the suitable structure of the hoppers to optimize the burden and gas distribution of the blast furnace and improve the gas utilization rate.A three-dimensional model of a 1:1 bell-less top blast furnace with serial-type hoppers was established based on the discrete element method,which simulates the entire movement process of the burden from the belt to each hopper and then to the throat.The effects of internal components,such as the distributor,guiding cone,and buffer platform,on particle size segregation in the upper hopper,the weighing hopper,and the throat of the blast furnace were investigated.The results indicate that removing the distributor can reduce the burden segregation during the discharge from the weighing hopper.The guiding cone significantly influences the radial particle size distribution within the weighing hopper and its discharge.Eliminating the buffer platform promotes a more uniform burden distribution both in the weighing hopper and the throat of the blast furnace.Among the conditions investigated,removing the distributor and the buffer platform yields the best distribution,with the segregation index improved by 92%compared to the base model,which is recommended for practical operations. 展开更多
关键词 Blast furnace Burden distribution Segregation Internal part Discrete element method
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Cluster-Driven Strengthening and Oxide Stripes-Induced Embrittlement in Internally Oxidized AgMg Alloys 认领 引用
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作者 Hai-Cheng Zhu Shao-Hong Liu +10 位作者 Li-Min Zhou Hao Cui Hong-Ying Pei Wen-Yan Zhou Man-Men Liu Hai-Gang Dong Ming Wen Li Chen Wei Wang Song Li Liang Zuo 《Rare Metals》 SCIE EI CAS CSCD 2026年第2期383-394,共12页
Internal oxidation has been identified as an effective method for enhancing the strength of AgMg alloys.However,the concurrent occurrence of embrittlement remains inadequately understood,thus limiting their broader ap... Internal oxidation has been identified as an effective method for enhancing the strength of AgMg alloys.However,the concurrent occurrence of embrittlement remains inadequately understood,thus limiting their broader application.This study investigates the oxidation behavior of AgMg alloys with Mg concentrations ranging from 1 at% to 7 at% at 800 ℃,revealing a composition-dependent evolution of microstructure and mechanical properties.The oxidation process results in the formation of two distinct zones:a Mg/O solid solution zone (Mg/O SSZ),characterized by~3 nm Mg/O clusters,and an internal oxide band zone (IOBZ),where nanocrystalline MgO stripes emerge at Mg concentrations of 2 at%or higher.The Mg/O SSZ is responsible for substantial strengthening,with surface hardness increasing from 74 HV (as-cast) to 224 HV at 7 at %Mg,and tensile strength rising from less than 50 MPa (pure Ag) to 269 MPa at 1 at%Mg.In contrast,the development of MgO stripes within the IOBZ induces localized stress concentrations at incoherent MgO/Ag interfaces,resulting in embrittlement and a reduction in mechanical performance at higher Mg contents.The oxidation kinetics deviate progressively from Wagner's theory with increasing Mg concentration,as the formation of MgO stripes impedes oxygen transport,decreasing the oxidation rate from 7.83µm s-1/2at 1 at% Mg to 0.69µm s-1/2at 7 at% Mg.These results elucidate a compositionally tunable balance between nanoscale cluster-driven strengthening and oxide stripe-induced embrittlement,providing a mechanistic framework for the design of high-performance AgMg alloys for structural and electronic applications. 展开更多
关键词 AgMg alloy internal oxidation Mg/O cluster oxidation kinetics oxide stripe
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Numerical simulation of internal flow field in air–water transition process of transmedium engine 认领 引用
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作者 Conglin LIU Huanting JIANG +2 位作者 Xiaobo FANG Hong CHEN Changmeng LIU 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第5期281-297,共17页
Transmedium vehicles are characterised by high flexibility and strong attack capability,which makes them a key area of current research.However,the transition between air and water remains a critical outstanding issue... Transmedium vehicles are characterised by high flexibility and strong attack capability,which makes them a key area of current research.However,the transition between air and water remains a critical outstanding issue.The ramjet integrated air–water engine designed in this study is effective and stable in both air and water modes and shows a high degree of adaptability.Using three-dimensional numerical simulations,this study investigates the impact of intake configurations and environmental pressure variations on engine performance,with a focus on the distribution of internal flow field parameters and performance changes during the transition process.The results show that,although the secondary air intake configuration in air mode effectively improves the engine thrust,it causes the front part of the engine to overheat,resulting in a reduction in overall power.The primary intake configuration is more favorable for ensuring a safe transition.During the descent of a vehicle from high altitude,the pressure of the engine's exhaust tailpipe gradually increases,and the combustion products move to the front of the engine,resulting in a significant loss of power.The entire air–water transition process takes 0.3 s.To ensure the stable transition of the engine's thrust,this paper proposes a preloaded oxidizer supply control scheme,which injects the preloaded oxidizer within 0.012 s after transition,opens the water intake at 0.205 s,and achieves the engine's design performance for underwater mode at 0.3 s,after which the oxidizer injection is stopped.This scheme significantly improves the efficiency of the transition process and enhances engine stability.The results of this study provide theoretical support for the design and optimization of air–water transition in transmedium ramjet engines. 展开更多
关键词 Air-water transition Internal flow field Preloaded oxidizer supply scheme Ramjet engine Transmedium
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Consolidation-sealing of in-situ internal stress in deep rocks: Device development and mechanical behavior characterization 认领 引用
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作者 Mingzhong Gao Chuo Zhang +5 位作者 Fei Li Bengao Yang Jing Xie Zundong Yang Kunchen He Haichun Hao 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2026年第4期709-723,共15页
Addressing the scientific problem of unclear understanding of in-situ internal stress and its evolution in deep rock masses,a scientific definition and implementation path for the concept of in-situ internal stress co... Addressing the scientific problem of unclear understanding of in-situ internal stress and its evolution in deep rock masses,a scientific definition and implementation path for the concept of in-situ internal stress consolidation-sealing in deep rock masses are proposed,and a set of in-situ internal stress consolidationsealing test device for deep rock masses has been independently developed.The device consists of a material consolidation cultivation module,an in-situ internal stress environment simulation module,and a multi-source information capture module.And the three mechanical tests of internal stress preservation,internal stress release and conventional were carried out with the device.The evolution law of the deformation parameters in the internal stress consolidation-sealing stage was studied,and the difference characteristics of the deformation parameters before and after the internal stress releasing were compared and analyzed.The results show that the internal stress consolidation-sealing significantly affects the mechanical properties of the simulated rock material,while the internal stress release leads to the damage of the material properties,suggesting that the presence and influence of internal stress should not be overlooked.This study could provide a new research direction and scientific devices for the expansion and deepening of the field of deep in-situ rock mechanics. 展开更多
关键词 Deep rock mass In-situ rock mechanics Internal stress consolidation-sealing Test device
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Observation of Typhoon Trami(2024)-induced energy cascade from near-inertial waves to diurnal internal tides 认领 引用
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作者 Letian Chen Ze Zhang +4 位作者 Yifei Jiang Xiaojiang Zhang Jiagen Li Weimin Zhang Huizan Wang 《Atmospheric and Oceanic Science Letters》 CAS CSCD 2026年第2期74-81,共8页
Energy transfers among internal waves in the northern South China Sea are not well characterized,particularly during typhoons,owing to the lack of in situ observations.Based on high-resolution mooring data collected d... Energy transfers among internal waves in the northern South China Sea are not well characterized,particularly during typhoons,owing to the lack of in situ observations.Based on high-resolution mooring data collected during Typhoon Trami(2024),this study reveals the occurrence of robust vertical energy redistribution among diurnal internal tides(D1 ITs)and near-inertial waves(NIWs).Strikingly,the typhoon not only amplified the NIW energy but also triggered an unexpected surge in the D1 IT energy.The observed average net energy transfer rate of 1×10-7 W kg−1 from typhoon-forced NIWs to D1 ITs occurred at water depths of 120-170 m.Further bispectral analysis indicated that the energy transfer is driven by nonlinear wave—wave interaction.These results reveal the existence of a new energy transfer pathway—from atmospheric forcing to D1 ITs—and redefine the redistribution of the internal wave energy during extreme weather events. 展开更多
关键词 Tropical cyclones Mooring observation Near-inertial waves Energy cascade Diurnal internal tides South China Sea
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Internal architecture characterization of carbonate reservoirs and its geological significance for reservoir development:A case study of Cretaceous Main Mishrif Formation in H oilfield,the Middle East 认领 引用
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作者 QIAO Zhanfeng ZHU Guangya +4 位作者 SHAO Guanming FAN Zifei SUN Xiaowei ZHANG Yu NING Chaozhong 《Petroleum Exploration and Development》 SCIE 2026年第2期343-358,共16页
This study investigates the strong heterogeneity and complex internal architecture of carbonate reservoirs,using the Cretaceous Main Mishrif Formation in the Middle East as an example.A multi-scale characterization of... This study investigates the strong heterogeneity and complex internal architecture of carbonate reservoirs,using the Cretaceous Main Mishrif Formation in the Middle East as an example.A multi-scale characterization of sedimentary architecture is conducted based on reservoir genetic analysis.Quantitative calibration of well logs with core thin sections enables semi-quantitative evaluation of dissolution intensity in non-cored intervals.Within a coupled depositional-diagenetic framework,reservoir classification is established with depositional-diagenetic facies as the linking framework,allowing delineation of their spatial distribution and connectivity.The results show that three types of architectural units are developed in the Main Mishrif Formation,including tidal channels,bioclastic shoals,and tidal bioclastic deltas,which exhibit fining-upward,coarsening-upward,and coarsening-upward–fining-upward successions,respectively.These units form two composite stacking patterns,namely the“encapsulated”pattern and the“upper-lower”pattern.A dissolution intensity index is defined based on thin-section analysis,and a log-based prediction model is developed using principal component analysis and multivariate regression.Dissolution in the MB2 sub-member is controlled by third-order sequence boundaries,with strong dissolution occurring from MC1-1 to MB2-1,forming high-permeability zones across architectural units.In contrast,dissolution in the MB1 sub-member is controlled by high-frequency sequences,with stronger dissolution in the upper intervals,favoring the development of high-permeability zones.By combining depositional and dissolution characteristics,a total of 21 depositional-diagenetic facies are identified,and the distributions of high-permeability zones,high-quality,moderate,and poor reservoirs,as well as interlayers are systematically characterized.These findings provide a geological basis for stratified reservoir development,well pattern optimization,and remaining oil recovery in carbonate reservoirs,and are promising for the characterization of giant thick carbonate reservoirs in the Middle East and Central Asia. 展开更多
关键词 carbonate rock reservoir internal architecture reservoir characterization reservoir development Cretaceous Middle East Persian Gulf Basin Mesopotamian Basin
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Operando characterization of the internal multi-fields of industrial-scale fuel cells and mechanistic insight 认领 引用
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作者 Weichen Ji Xin Cai +3 位作者 Yunyang Ma Xin Liu Andreas Friedrich Rui Lin 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第3期667-675,共9页
Despite significant progress in fuel cell technology,its large-scale industrial application is still challenged by the frequently encountered performance failure during long-term operation.Clarifying the failure mecha... Despite significant progress in fuel cell technology,its large-scale industrial application is still challenged by the frequently encountered performance failure during long-term operation.Clarifying the failure mechanism is the key to extending the lifecycle and enhancing stability.Herein,we have developed a time and space resolved multi-field characterization,including electrochemical impedance spectroscopy,to unveil its underlying mechanism.With this operando and non-destructive characterization,the dynamic evolution of the internal mass transport,heat,and electricity field distribution is fully depicted within an industrial-scale fuel cell in operation.Thus,it is revealed that hydrogen starvation occurs in the outlet region due to the excessive hydrogen consumption during the loading-down process.This can induce local low current density and carbon corrosion,which may subsequently cause severe damage to the structure of the catalyst layer and membrane,ultimately leading to performance failure.With this understanding,we further identify a descriptor for early diagnosis to prevent any potential degradation.The methodology is of significance,which can bring fuel cell technology a step further towards industrial applications. 展开更多
关键词 Operando characterization Internal multi-fields Industrial-scale fuel cell Local Electrochemical impedance spectroscopy Stability mechanism
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H∞Optimal Output Regulation of Unknown Linear Systems via an Adaptive Dynamic Programming and Internal Model 认领 引用
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作者 Yong-Sheng Ma Jian Sun Yong Xu 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2026年第6期1314-1324,共11页
This paper delves into the H∞optimal output regulation problem for continuous-time linear systems with an unknown system model.By integrating the internal model principle with optimal control,we derive an optimal con... This paper delves into the H∞optimal output regulation problem for continuous-time linear systems with an unknown system model.By integrating the internal model principle with optimal control,we derive an optimal control policy and a worst-case disturbance policy through the formulation and solution of a zero-sum game problem.Subsequently,leveraging adaptive dynamic programming,we propose a policy iteration learning algorithm capable of learning both the optimal control policy and the worst-case disturbance policy directly from system data.The existing algorithms necessitate an initial stabilizing policy,a full-rank condition,and the storage of historical data to guarantee algorithm convergence.In contrast,we design a dual policy iteration algorithm equipped with an online learning mechanism,thereby eliminating these additional prerequisites.Simulation results with an antonomous ground vehicle underscore the effectiveness of our proposed algorithm,and its superiority is further demonstrated through comparisons with existing methodologies. 展开更多
关键词 Adaptive dynamic programming internal model principle optimal control output regulation
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S-scheme heterojunctions of metal-doped ZnIn2S4/TpPa-1:Regulating H adsorption/desorption and internal electric field for boosted dual-functional photocatalysis 认领 引用
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作者 Shaodan Wang Heng Yang +3 位作者 Lijun Xue Jianjun Zhang Shuxin Ouyang Lili Wen 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2026年第1期159-173,共15页
Cooperative coupling of photocatalytic hydrogen generation with oxidative organic synthesis is promising in simultaneously producing sustainable energy and value-added chemicals.However,the photocatalytic activity is ... Cooperative coupling of photocatalytic hydrogen generation with oxidative organic synthesis is promising in simultaneously producing sustainable energy and value-added chemicals.However,the photocatalytic activity is constrained by restricted redox potentials and insufficient photocarrier separation and transfer.Herein,we construct S-scheme heterojunctions based on metal-doped ZnIn2S4 and covalent organic frameworks,denoted as M-ZIS/TpPa-1(M=Ni or Mo).Theoretical calculations demonstrated that Mo-ZIS possess optimum H adsorption Gibbs free energies,deeper downshift of sulfur p-band center and higher integrated crystal orbital Hamilton population(ICOHP)value than Ni-ZIS and ZIS to optimize H adsorption/desorption dynamics.Besides,metal-doping reasonably enhanced the interfacial charge transfer in heterostructures,identifying the enlarged internal electric field(IEF)in Mo-ZIS/TpPa-1 than Ni-ZIS/TpPa-1 and ZIS/TpPa-1.Moreover,experimental explorations of photoelectrochemical measurements,femtosecond transient absorption spectroscopy,in-situ irradiated X-ray photoelectron spectroscopy and electron paramagnetic resonance verified the facilitated photocarrier separation and migration in metal-doped S-scheme heterojunctions.Ultimately,Mo0.01-ZIS/TpPa-1 exhibited visible-light driven H2 evolution rate of 1648μmol g-1 h-1 and N-benzylidenebenzylamine formation rate of 1812μmol g-1 h-1,better than Ni0.048-ZIS/TpPa-1,and superior to parent ZIS/TpPa-1.This work might provide insights into the modulation of H adsorption/desorption behavior and IEF within S-scheme heterostructures via rational metal-doping strategy for efficient dual-functional photocatalysis. 展开更多
关键词 Covalent organic frameworks Metal-doped ZnIn2S4 S-scheme heterojunction H adsorption/desorption Internal electric field Dual-functional photocatalysis
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Spatial-temporal correlation between surface distress and internal damage in pavement structure 认领 引用
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作者 Yuhui Zhang Peiguo Yuan +5 位作者 Zhongping Wang Zepeng Fan Haotian Lyu Fujiao Tang Binglei Xie Dawei Wang 《Journal of Road Engineering》 EI CAS 2026年第2期232-244,共13页
A recurrent phenomenon is the reappearance of distress conditions on the same road section,both before and after maintenance interventions.The maintenance work essentially addresses the superficial symptoms rather tha... A recurrent phenomenon is the reappearance of distress conditions on the same road section,both before and after maintenance interventions.The maintenance work essentially addresses the superficial symptoms rather than the root causes,since the internal relationships between various forms of distress remain unclear.This study quantitatively evaluates the correlation between surface distress and internal defects based on field detection data and statistical methods,effectively complementing existing qualitative analytical method.Approximately 200 defect locations data were collected from the RIOHTrack full-scale ring road,and targeted evaluation metrics reflecting pavement performance were proposed.Then,the Ripley's K-function was employed to analyze the spatial aggregation of surface and internal cracks,and to further verify their macroscopic correlation during the spatio-temporal evolution process.Next,kernel density estimation and relative risk assessment were used to investigate the relationships between the surface distress and internal defects.Experimental results reveal that the loading position significantly affects surface distress,but exhibits no obvious correlation with hidden damage,and there is also no spatial aggregation phenomenon between them.However,for semi-rigid base asphalt pavement,internal cracks and surface cracks show a strong correlation,while demonstrating only a weak association with loading position.Finally,a sensitivity analysis was performed based on the results obtained at different distance thresholds,and r=0.5 m was designated as the optimal spatial correlation distance threshold.This threshold was then used to determine the pavement structure offering the best crack resistance performance,providing a key reference for the design and maintenance of heavy-duty highway pavements.This study provides a reference for road active maintenance and supports the transformation of maintenance strategies from passive response to active intervention. 展开更多
关键词 Pavement structure RIOHTrack Ripley's K-function Kernel density estimation Surface distress Internal defects
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Numerical Optimization of Internal Cooling Structure Placement for MHD Mixed Convection Using Multi-Nanoparticle Fluids 认领 引用
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作者 Basma Souayeh 《Computer Modeling in Engineering & Sciences》 SCIE EI 2026年第5期726-758,共33页
This study conducts a comprehensive numerical investigation of magnetohydrodynamic(MHD)mixed convection and entropy generation in a two-dimensional square cavity filled with a ternary hybrid nanofluid.The working flui... This study conducts a comprehensive numerical investigation of magnetohydrodynamic(MHD)mixed convection and entropy generation in a two-dimensional square cavity filled with a ternary hybrid nanofluid.The working fluid consists of Multi-Walled Carbon Nanotubes(MWCNT),Copper(Cu),and Ferric Oxide(Fe3O4)nanoparticles dispersed in water,selected for their superior thermal properties.Two vertically aligned,saw-toothshaped cooling structures are embedded along the left and right walls of the cavity,with four distinct configurations considered based on their vertical positioning.An externally imposed uniform magnetic field is applied to assess its influence on fluid flow,heat transfer,and thermodynamic irreversibility.The governing nonlinear partial differential equations accounting for mass,momentum,energy,and entropy generation are solved using the Finite Volume Method(FVM)in conjunction with a Full Multigrid Algorithm to enhance computational efficiency.The study systematically examines the effects of key dimensionless parameters,including the Hartmann number(Ha),Richardson number(Ri),Reynolds number(Re),nanoparticle volume fraction(φ),and structural configuration,on flow dynamics,thermal performance,and entropy generation.The results provide valuable insights into the optimization of heat transfer systems through geometrical and thermophysical enhancements under MHD conditions.Results reveal that among the configurations studied,the position(P3)configuration featuring asymmetrical placement of the internal saw-tooth cooling structures demonstrates the highest thermal performance,achieving an average Nusselt number of 63.698 at a nanoparticle volume fraction ofφ=12%and Richardson numbers in the range of Ri=60-80.This superior performance is attributed to enhanced convective mixing and optimal disruption of thermal boundary layers without excessive entropy generation. 展开更多
关键词 Mixed convection saw-tooth internal structures different positions entropy analysis triple-component nanoparticle fluid
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The Birth of Ilza Veith’s The Yellow Emperor’s Classic of Internal Medicine 认领 引用
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作者 GUI Ting 《Chinese Medicine and Culture》 CAS 2026年第2期132-141,共10页
Ilza Veith is renowned for her 1949 publication The Yellow Emperor’s Classic of Internal Medicine,the pioneering English translation of the ancient Chinese medical classic Huang Di Nei Jing(《黄帝内经》The Yellow Emp... Ilza Veith is renowned for her 1949 publication The Yellow Emperor’s Classic of Internal Medicine,the pioneering English translation of the ancient Chinese medical classic Huang Di Nei Jing(《黄帝内经》The Yellow Emperor’s Inner Classic).This article explores the birth of Veith’s translation,drawing on archives from the Alan Mason Chesney Medical Archives at Johns Hopkins University and Yale University Library.Sponsored by Mrs.Theresa Lindau,Ilza Veith began her translation work by editing J.W.Lindau’s manuscripts.Later,with support from the Rockefeller Foundation,she continued the translation by pursuing a Ph.D.in the History of Medicine.The insights and efforts of Henry E.Sigerist and Edward H.Hume facilitated the birth of Ilza Veith’s translation of Huang Di Nei Jing.As a landmark in the history of traditional Chinese medicine in the West,Veith’s work was the converging result of the development of medical history and Asian studies in the United States during the first half of the 20th century. 展开更多
关键词 Ilza Veith The Yellow Emperor’s Classic of Internal Medicine Huang Di Nei Jing(《黄帝内经》The Yellow Emperor’s Inner Classic) Translation Henry E.Sigerist Edward H.Hume Dissemination Traditional Chinese medicine
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Intramolecular internal electric field and activated n-π* electronic transition co-promoted photocatalysis activity of carbon nitride:Mechanism and toxicity evaluation 认领 引用
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作者 Yanbin Chen Tianyu Zhou +3 位作者 Chunbo Liu Bo Hu Guojie Liu Guangbo Che 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第7期119-131,共13页
Graphitic carbon nitride(CN)exhibits enormous potential in addressing the global energy crisis and environmental issues,while poor charge behavior and insufficient light harvesting capability significantly impede its ... Graphitic carbon nitride(CN)exhibits enormous potential in addressing the global energy crisis and environmental issues,while poor charge behavior and insufficient light harvesting capability significantly impede its practical applications.Herein,CN with strong internal electric field and activated n-π* electron transitions was synthesized through one-pot thermal copolymerization of urea and 4,4-Bis(diethylphosphonomethyl)biphenyl.The integrated donor-acceptor structure induces powerful internal electric field,enhancing exciton dissociation efficiency and accelerating charge carrier transport.Simultaneously,n-π* electron transitions are successfully activated by lone pair electrons of phosphorus atoms,broadening the photo-response-range up to 500 nm.The above merits endow the optimal sample 45-BCN with boosted activity,achieving 100%photodegradation efficiency for tetracycline(TC)within 40 min and significantly enhanced nitrogen fixation efficiency(about 5 times that of CN).Furthermore,the toxicity of photocatalytic-generated intermediates of TC was significantly alleviated according to the Quantitative Structure Activity Relationship model prediction and mung bean growth experiments.This work offers valuable insights into the construction of cost-effective,high-efficiency and environmental-friendly CN photocatalysts for mitigating water pollution and enabling solar-driven nitrogen fixation. 展开更多
关键词 Photocatalysis Carbon nitride Degradation Nitrogen fixation Internal electric field n-π*electronic transition
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Analytical prediction for lateral deformation of internal braced diaphragm wall in foundation pit based on plate theory 认领 引用
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作者 SONG Ye ZHANG Ding-li +1 位作者 SUN Zhen-yu WANG Guan-qing 《Journal of Central South University》 SCIE EI CAS CSCD 2026年第4期1669-1686,共18页
Current analytical methods for predicting the lateral deformation of diaphragm walls require complex calculation processes,including numerous parameters with uncertain accuracy,which are difficult to use in practical ... Current analytical methods for predicting the lateral deformation of diaphragm walls require complex calculation processes,including numerous parameters with uncertain accuracy,which are difficult to use in practical engineering applications.In this study,we propose a novel analytical approach for calculating diaphragm wall deformation.First,a differential element moment balance method for calculating earth pressure is proposed using a simplified calculation.The excavation effect on the sliding wedge and multiple factors of the ground were considered.Subsequently,the work performed by the earth pressure and internal support structure was calculated.Based on plate theory,a calculation model for the diaphragm wall deformation was established,accounting for the interaction between the ground and internal support structure.Finally,the analytical model was solved using the principle of minimum potential energy and the Ritz method.The proposed method was validated by comparing field measurement data with numerical simulations.A parametric study was conducted to explore the sensitivities of the influencing factors on the lateral deformation of the diaphragm wall,from which a design scheme for the diaphragm wall was presented under the given deformation control standard. 展开更多
关键词 foundation pit plate theory analytical model soil-structure interaction internal braced diaphragm wall Ritz method
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Numerical Investigation of an Internal Solitary Wave Interaction with Elliptical Submersibles 认领 引用
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作者 WANG Yong-jie JIANG Chang-bo +1 位作者 DENG Bin DONG Dao-jiao 《China Ocean Engineering》 SCIE EI CSCD 2026年第2期452-465,共14页
This study examines the interaction between internal solitary waves(ISWs)and an elliptical submersible based on the eKdV theory.The numerical model’s accuracy is validated through comparison of force calculations on ... This study examines the interaction between internal solitary waves(ISWs)and an elliptical submersible based on the eKdV theory.The numerical model’s accuracy is validated through comparison of force calculations on a single cylinder with experimental data.Analysis reveals significant hydrodynamic characteristics around the elliptical submersible.The findings demonstrate that vertical positioning and elevation angle substantially influence wave loads on the submersible.At various vertical positions,uniform distribution of elevated hydrodynamic pressure may result in submersible disintegration.Submersibles with±30°elevation angles experience greater total moments,increasing their susceptibility to capsizing.The maximum horizontal force increases by factors ranging from 1.46 to 8.81 when the submersible is inclined between−30°and 30°.The interface exhibits negative vorticity accumulation due to shear effects between upper and lower fluids.Submersible inclination leads to increased surrounding velocity and vorticity. 展开更多
关键词 internal solitary wave elliptical submersible forces dynamic pressures flow field
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Assessing the environmental benefits and carbon emission reduction potential of lithium-ion batteries and internal combustion engines for vehicles 认领 引用
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作者 Yixin Quan Guoliang Cao Qian Zhang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第8期711-722,共12页
The global expansion of lithium-ion battery production necessitates a thorough investigation into its greenhouse gas emissions.Based on SimaPro software and the Ecoinvent database,this study employs the IPCC GWP 100a ... The global expansion of lithium-ion battery production necessitates a thorough investigation into its greenhouse gas emissions.Based on SimaPro software and the Ecoinvent database,this study employs the IPCC GWP 100a and CML-IA baseline methodologies to analyse the carbon emissions and environmental impacts of electric vehicles and internal combustion engine vehicles throughout a 200,000 km service life,covering both production and use phases.Results indicate that emissions during the power systems production phase originate primarily from cathode materials and aluminium,with electricity consumption contributing 23.5%-39.4%.During the use phase,the three vehicle types generate 35,652-50,809 kg CO2-eq,with the lithium nickel cobalt manganese oxide(NCM811)vehicle achieving the carbon break-even point faster than the lithium iron phosphate(LFP)vehicle under the current energy mix.Projections based on China's 2060 energy mix indicate a 21.5%-31.0%reduction in battery production carbon emissions and a 71.1%-84.5% decrease in the break-even distance,at which point the LFP vehicle outperforms the NCM811.These findings provide critical insights for optimizing electric vehicle battery production and supporting carbon neutrality goals. 展开更多
关键词 Life cycle assessment Lithium-ion batteries Internal combustion engine Carbon emission break-even point Environmental impacts
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