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Crushing characteristics of granite during ultra-high speed penetration:experiments and simulations 认领 引用
1
作者 Yizhe Liu Quanyu Jiang +6 位作者 Zheng Hu Zishang Liu Jiayi Zheng Yi Liu Yanpeng Wei Kun Zhang Bingchen Wei 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第4期672-683,共12页
Escaping ejecta enhanced momentum transfer due to recoil produced by the impact,depending on the complex interaction of the projectile remove with to target.The crushing behavior of the target in the initial stage of ... Escaping ejecta enhanced momentum transfer due to recoil produced by the impact,depending on the complex interaction of the projectile remove with to target.The crushing behavior of the target in the initial stage of impact is often neglected,especially in meteorite-like brittle materials.Whereas,the relationship between crack evolution and stress wave propagation is vague under ultra-high speed impact.The experiments of Al sphere impacting into granite were carried out at velocities between 1800 and 4000 m/s by a two-stage light-gas gun(DBR30),revealing distinct fragmentation characteristics on granite.As the speed increases,transitions from intact to fractured,then fragmented,exhibiting distinct failure modes under shock wave loading.Smoothed particle hydrodynamics-finite element method(SPH-FEM)simulation was employed to describe the geometrical evolution of the projectile and the propagation crack in the target.It was found that the shape of the projectile gradually changes from a cone to spherical as speeds increase.Further crack fractal dimension analysis revealed that the penetration mode transition occurs within 1500-2000 m/s.This method provides a novel framework to evaluate the ultrahigh speed penetration while quantifying the penetration mode and crushing effect. 展开更多
关键词 Ultra-high speed Coupled SPH-FEM Crushing characteristics Penetration Fractal dimension
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Study on prediction of annular trap pressure in ultra-high temperature and high pressure gas wells 认领 引用
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作者 Bo-Yuan Yang Hui Zhang +5 位作者 Bao-Kang Wu Kun-Hong Lv Rui Yuan Yu-Ting Zhou Xing-Yu Li Ze Yang 《Petroleum Science》 SCIE EI CAS CSCD 2026年第3期1307-1318,共12页
Accurate calculation of annular trap pressure in ultra-high-temperature and high-pressure(UHTHP)wells is crucial for ensuring the safety and integrity of tubular systems.Existing annular pressure prediction models oft... Accurate calculation of annular trap pressure in ultra-high-temperature and high-pressure(UHTHP)wells is crucial for ensuring the safety and integrity of tubular systems.Existing annular pressure prediction models often fall short due to inadequate consideration of key factors,resulting in reduced accuracy and,consequently,unreliable predictions for tubular safety assessments.This paper examines the underlying mechanisms of annular trap pressure in UHTHP wells and proposes a multi-annular pressure prediction model grounded in the compatibility principle.A gas-liquid two-phase multiannular pressure coupling model is also developed,incorporating nitrogen injection into the A annulus and utilizing the BWSR equation of state to enhance the model's accuracy.Additionally,a pressure prediction model for the annular space between dual packers is introduced,building upon the multi-annular pressure prediction framework.The results demonstrate that the proposed multi-annular pressure model significantly improves the accuracy of APB predictions for UHTHP gas wells.The findings provide valuable theoretical insights and practical guidance,facilitating more precise prediction of annular trap pressure in extreme downhole conditions and offering essential support for safe operations in these challenging environments. 展开更多
关键词 Ultra-high temperature and high-pressure wells Multi-annular pressure prediction Gas-liquid two-phase coupling Double packer annulus
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Molecular Investigations on the Diffusion of Hydrated Ions and Its Effects on the Plastic Deformation of Ultra-high Molecular Weight Polyethylene at Seawater Condition 认领 引用
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作者 Qi-Hao Cheng Ting Zheng +1 位作者 Gang Yang Hui-Chen Zhang 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2026年第1期299-313,I0019,共15页
Ultra-high molecular weight polyethylene(UHMWPE)is a key material for marine applications owing to its outstanding self-lubrication and corrosion resistance.However,its long-term performance is compromised by plastic ... Ultra-high molecular weight polyethylene(UHMWPE)is a key material for marine applications owing to its outstanding self-lubrication and corrosion resistance.However,its long-term performance is compromised by plastic deformation in seawater.In this study,we performed a comparative analysis of the UHMWPE dynamics under seawater and water conditions to investigate the plastic deformation of UHMWPE induced by seawater.The results show that the plastic deformation of UHMWPE is amplified in seawater relative to the water conditions.Under thin fluid conditions,frictional interfaces exhibit a higher interfacial friction force and interaction energy in seawater than in water.Compared to freely diffused water molecules,hydrated ions occupy larger interchain spaces within polyethylene.Furthermore,the diffusion of hydrated ions weakens the interchain interactions,promoting more severe polyethylene chain rearrangement and accelerating seawater-induced plastic deformation in UHMWPE during friction.Furthermore,the diffused seawater accelerated the disentangling of the polyethylene chains and enhanced the orderly orientation distribution of polyethylene.Compared to free water molecules,the water molecules of hydrated ions exhibit enhanced attraction to free-flowing water molecules,thereby accelerating seawater flow across submerged UHMWPE surfaces.This flow enhancement promotes surface polyethylene chain mobility in seawater. 展开更多
关键词 Ultra-high molecular weight polyethylene Plastic deformation Seawater Hydrated ion Molecular dynamics
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Flexible Ultra-High Performance Reinforced Cementitious Composite Plates Based on Multiscale Fibrous Reinforcements 认领 引用
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作者 Peizhao Zhou Peng Feng 《Engineering》 SCIE EI CSCD 2026年第6期90-108,共19页
The concept of multiscale fibrous reinforcements in cementitious matrices is characterized by a wide range of scales from distributed nanomaterials and chopped short fibers to continuous fibrous reinforce-ments.Based ... The concept of multiscale fibrous reinforcements in cementitious matrices is characterized by a wide range of scales from distributed nanomaterials and chopped short fibers to continuous fibrous reinforce-ments.Based on fibrous reinforcements at multiple scales,this study elaborately optimizes mechanical behavior by tailoring the types and volume fraction of fibers and develops a cementitious composite,flexi-ble ultra-high performance reinforced cementitious composite(FHPRC),with 160 MPa compressive strength,36 MPa tensile strength,over 1%ultimate tensile strain,less than 0.1 mm crack width,and sig-nificant post-yield stiffness.FHPRC combines the superior strength and durability of ultra-high perfor-mance concrete(UHPC)with the high ductility and crack control capacity of engineered cementitious composite.We demonstrated the effectiveness of the material design strategy through experimental and numerical examinations.The effects of the types of short fibers(steel with a designed length of 13 mm and glass with a length of 50 mm),fiber-reinforced polymers(FRPs)(carbon and glass),and textile configuration on the flexural behavior were analyzed.To capture their flexural behavior,several numeri-cal models have been developed to optimize FHPRCs.Furthermore,the layered shell finite element model(FEM)based on the smeared crack approach considerably simplifies the numerical effort required to sim-ulate intense matrix cracking.However,no realistic constitutive model for any composite containing one or more reinforcing fibers for layered shell FEMs has been developed.Hence,an equivalent constitutive model for layered shells was established to analyze the flexural behavior of FHPRCs.The model proved that the combination of UHPC and carbon FRP textiles yielded a superior composite.The research results provide valuable insights into the evolving field of advanced construction materials and engineering. 展开更多
关键词 Fiber-reinforced polymer(FRP)textile Flexural behavior Tailoring Ultra-high performance concrete(UHPC)
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Perovskite nanocrystals in glass for high efficiency and ultra-high resolution dynamic holographic multicolor display 认领 引用
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作者 Chao Ruan Xinkuo Li +2 位作者 Ke Sun Jianrong Qiu Dezhi Tan 《Opto-Electronic Advances》 SCIE EI CAS CSCD 2026年第3期93-104,共12页
Incorporating perovskite nanocrystals(PNCs)in the glass matrix has been demonstrated to be an effective route to improve their stability for long-term operation.However,simultaneously achieving high luminance and high... Incorporating perovskite nanocrystals(PNCs)in the glass matrix has been demonstrated to be an effective route to improve their stability for long-term operation.However,simultaneously achieving high luminance and high photoluminescence(PL)quantum yield(QY)is challenging.Herein,we report a strategy that employs fluoride ion doping to modify the three-dimensional glass network,thereby optimizing the crystallization behavior of PNCs and achieving both high luminance and high PLQY in full-spectrum.Leveraging these high-performance transparent composites,we constructed a dynamic holographic multicolor display system by integrating with a spatial light modulator(SLM),achieving a pixel density as high as 20,247 pixels per inch(PPI).We further propose a vertically stacked,multilayer full-color display architecture that overcomes the limitations of color filters in light-utilization efficiency and the bottlenecks of conventional planar sub-pixel layouts in terms of spatial utilization and resolution. 展开更多
关键词 perovskite nanocrystals glass matrix high efficiency photoluminescence ultra-high resolution multicolor display
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The Pit-forming Mechanism of Tungsten Alloy Fragments Penetrating High-strength Steel under Ultra-high Speed impact 认领 引用
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作者 WAN Mingming LI Xue +5 位作者 WANG Yanli LIU Bowen ZHANG Hengjun SONG Limei LI Yuan LI Yang 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2026年第4期1067-1074,共8页
Based on the background of new high-strength steel protective materials hitted by the ultrahigh speed weapons,the Hugoniot elastic limit strength of the material was obtained through the high-strength steel flying fra... Based on the background of new high-strength steel protective materials hitted by the ultrahigh speed weapons,the Hugoniot elastic limit strength of the material was obtained through the high-strength steel flying fragment impact test.A two-stage light gas gun was used to carry out an ultra-high speed impact test on the 6 g tungsten alloy spherical fragments penetrating the high-strength steel target,and the ANSYS/LSDYNA software was used to perform numerical calculations of the ultra-high speed penetration.The experimental results reveal that the Hugoniot elastic limit strength obtained in the test can provide a good reference for the correction of simulation parameters.There are differences in the pit formation mechanism of highstrength steel at different speeds.At ultra-high speeds,the penetration depth is reduced due to the shearing,spalling,delamination and material properties of the projectile. 展开更多
关键词 crater formation mechanism experimental study hugoniot elastic limit ultra-high speed collision numerical simulation
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A Hybrid Ultra-High Voltage DC Transformer With Digital Twin-Driven Operation and Control 认领 引用
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作者 Ling Xu Le Zhao +4 位作者 Xiaohu Zhang Hanlin Guo Jie Fang Zheren Zhang Zheng Xu 《Digital Twins and Applications》 EI 2026年第1期126-137,共12页
In the context of large-scale renewable energy transmission,to enhance the economic efficiency and operational flexibility of the ultra-high voltage DC transformer(UHVDCT),a hybrid UHVDCT with digital twin(DT)-driven ... In the context of large-scale renewable energy transmission,to enhance the economic efficiency and operational flexibility of the ultra-high voltage DC transformer(UHVDCT),a hybrid UHVDCT with digital twin(DT)-driven operation and control is introduced.The proposed UHVDCT adopts a parallel configuration of high-capacity line commutated converters(LCCs)and low-capacity modular multilevel converters(MMCs)at the ultra-high voltage(UHV)side,and MMCs at the high voltage(HV)side.Relying on the real-time mapping and online analysis capabilities of the DT,the LCCs at the UHV side(UHV-LCCs)transmit the total active power flow of the UHV side by controlling it.The MMCs at the UHV side(UHV-MMCs)operate in V/f control mode,with their reference signals generated by the DT in the virtual space.Their primary function is to establish a stable voltage and frequency reference for the internal AC links of the UHVDCT.Adopting constant DC voltage and improved reactive power control mode coordinated by the DT,MMCs at the HV side(HV-MMCs)can maintain their DC voltage and the UHVDCT's dynamic reactive power balance.By integrating the merits of LCC and MMC and leveraging DT technology,the proposed UHVDCT cuts the MMC capacity requirement for lower cost,ensures stable performance,and enhances its economic and engineering viability. 展开更多
关键词 digital twin high voltage DC transmission large-scale renewable energy ultra-high voltage DC transformer
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Robust Graph Diffusion for Multi-Task Learning in Ultra-High Voltage Direct Current Monitoring Systems 认领 引用
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作者 Shaojie Wang Chuliang Xue +3 位作者 Hui Li Rui Zhu Xiaoping Ren Limei Hu 《Journal of Beijing Institute of Technology》 EI CAS 2026年第2期150-158,共9页
In this work,we investigate the problem of multi-task learning(MTL)in ultra-high voltage direct current(UHVDC)monitoring systems.Considering the measurements are affected by wireless channel impairments,typically char... In this work,we investigate the problem of multi-task learning(MTL)in ultra-high voltage direct current(UHVDC)monitoring systems.Considering the measurements are affected by wireless channel impairments,typically characterized by block fading and link noise.Such channel imperfections significantly degrade the performance of distributed estimation in real-world power system environments.Based on the graph signal processing method,we propose the multi-task robust decoupled diffusion least mean square algorithm(MT-RDDLMS).Specifically,a decoupled adapt-then-combine strategy is introduced to reduce the influence of wireless channels on data exchange among measurement units.Moreover,an average estimation method with an adaptive smoothing factor is developed to further suppress link noise and enhance estimation accuracy.Simulation results confirm the robustness and effectiveness of the proposed algorithm under realistic wireless channel conditions. 展开更多
关键词 graph signal processing distributed multitask learning ultra-high voltage direct cur-rent(UHVDC)systems average estimation
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Formation mechanism and microstructural evolution of bubbles during ultra-high temperature oxidation of multicomponent carbides 认领 引用
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作者 Shiyan Chen Zhaoke Chen +4 位作者 Weilong Song Yi Zeng Fengminyu Xie Zhennan Xu Xiang Xiong 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第33期122-135,共14页
Bubbles are prevalent defects on the oxidized surfaces of ultra-high temperature carbides,compromis-ing structural stability and oxidation resistance.Despite their significance,the formation mechanisms and microstruct... Bubbles are prevalent defects on the oxidized surfaces of ultra-high temperature carbides,compromis-ing structural stability and oxidation resistance.Despite their significance,the formation mechanisms and microstructural evolution of bubbles during ultra-high temperature oxidation remain inadequately understood.To address this gap,the bubble behaviors of multicomponent carbides,including(Hf,Ti)C,(Hf,Zr,Ti)C,(Hf,Zr,Ti,Ta)C,and(Hf,Zr,Ti,Nb)C,were investigated under oxidation conditions at 2500℃.The roles of various elements were elucidated through first-principles calculations.Results show that the for-mation of a dense composite oxide layer is essential for bubble generation,with the release of gaseous products serving as the primary driving force.The microstructure of the bubbles is influenced by the ma-trix composition.The addition of Ti,Ta,and Nb significantly lowers the surface energy of the shell oxides,providing preferential nucleation sites for bubbles.The progressive oxidation of Ti leads to the formation of a“TiO2-TiO-HfO2”multilayerstructureat thebubbletop,which evolvesintoadendriticstructurewith prolonged oxidation.Ta and Nb further modulate the size and number of bubbles by altering the compo-sition and surface energy of the shell oxides. 展开更多
关键词 Bubble Ultra-high temperature ceramics Multicomponent carbides Ultra-high temperature oxidation Thermal protection materials
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3D printing of thick film NTC thermistor from preceramic polymer composites for ultra-high temperature measurement 认领 引用 被引量：2
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作者 Lida Xu Xiong Zhou +10 位作者 Lantian Tang Yusen Wang Fuxin Zhao Yanzhang Fu Yingjun Zeng Guochun Chen Chao Wu Lingyun Wang Qingtao Yang Daoheng Sun Qinnan Chen 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第8期1-10,共10页
Integrating thickhin film sensors into component systems has emerged as a prevalent approach for monitoring in extreme environments.However,traditional vapor deposition methods face obstacles,including complex fabrica... Integrating thickhin film sensors into component systems has emerged as a prevalent approach for monitoring in extreme environments.However,traditional vapor deposition methods face obstacles,including complex fabrication processes and the degradation of sensitive materials at extremely high temperatures.This work delineates the development of a polysilazane composite dual-layer thick-film Negative Temperature Coefficient(NTC)thermistor characterized by its suitability for extreme temperatures and robust bond strength achieved through an advanced near-net-shape printing methodology.High-temperature resistant La(Ca)CrO3/polysilazane films were printed as the sensitive layer,while a dense layer formed by Cr2O3/polysilazane was used as the protective layer.The bilayer structure resulted in a 2.5-fold increase in adhesion strength compared to the single-layer La(Ca)CrO3/polysilazane films.Experimental results indicate that the dual-layer thick-film NTC thermistor can be operated long-term at 1300℃ with a resistance drift rate of 0.9%/h and survive short-term exposure to temperatures up to 1550℃.As a proof of concept,this work applied 3D printing technology to fabricate a polysilazane composite dual-layer thick-film NTC thermistor on the surface of turbine blades and demonstrated its functionality under flame impingement at nearly 1300℃.Such flexible 3D printing techniques pave the way for a new paradigm in manufacturing sensors capable of withstanding ultra-high temperatures. 展开更多
关键词 La(Ca)CrO3 Polysilazane thick film sensors Ultra-High Temperature 3D Printing
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Microcellular Foaming-derived Superlight Ultra-high Molecular Weight Poly(vinylidene fluoride)Foams for Outstanding Thermal InsulationApplications 认领 引用 被引量：1
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作者 Chao Wei Jia-Long Chai +1 位作者 Shuai Li Gui-Long Wang 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2025年第10期1837-1849,共13页
Poly(vinylidene fluoride)(PVDF)foam has received widespread attention due to its high strength,and excellent combination of flame-retardancy,antibacterial performance,and chemical stability.However,the foaming ability... Poly(vinylidene fluoride)(PVDF)foam has received widespread attention due to its high strength,and excellent combination of flame-retardancy,antibacterial performance,and chemical stability.However,the foaming ability of conventional PvDF is severely limited by its rapid crystallization kinetics and poor melt strength.Although ultra-high molecular weight PVDF(H-PVDF)theoretically offers prolonged melt elasticity favorable for foaming,the extremely high melt viscosity poses substantial processing challenges,and its foaming behavior has remained largely unexplored.To address these issues,this study proposes a novel fabrication strategy combining solvent casting with microcellular foaming to prepare H-PVDF foams.Dynamic mechanical analysis and differential scanning calorimetry reveal that extensive chain entanglements in H-PVDF impose constraints on crystallization and significantly enhance melt strength.By tuning the processing parameters,the distinctive foaming be-havior of H-PVDF under various conditions is systematically elucidated.Remarkably,a record-high expansion ratio of 55.6-fold is achieved,ac-companied by a highly uniform and fine cellular structure.The resulting H-PVDF foams exhibit a low thermal conductivity of 31.8 mW·m-1.K-1,while retaining excellent compressive strength,flame-retardancy,and hydrophobicity.These outstanding properties highlight the great potential of H-PVDF foams as the thermal insulation materials for applications in aerospace,energy infrastructure,and other extreme environments. 展开更多
关键词 Microcellular foaming Ultra-high molecular weight PVDF Superlight Thermal insulation Flame-retardancy
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Ultra-high overpotential induces NiS2deep reconstruction to significantly improve HER performance 认领 引用
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作者 Chao Feng Jiaxin Shao +5 位作者 Hanyang Wu Afaq Hassan Hengpan Yang Jiaying Yu Qi Hu Chuanxin He 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2025年第5期230-242,共13页
It is well known that transition metal sulfides(TMS)(i.e.,NiS2)undergo electrochemical reconstructions to generate highly active Ni3S2 during the process of hydrogen evolution reaction(HER)under overpotential... It is well known that transition metal sulfides(TMS)(i.e.,NiS2)undergo electrochemical reconstructions to generate highly active Ni3S2 during the process of hydrogen evolution reaction(HER)under overpotentials of<500 mV.However,at higher overpotentials,Ni3S2 can theoretically be further restructured into Ni and thus form Ni/Ni3S2 heterogeneous interface structures,which may provide opportunities to further enhance HER activity of NiS2.Here,we selected NiS2 as a model electrocatalyst and investigated the influence of the reconstruction results induced from regular to ultrahigh overpotentials on its electrocatalytic hydrogen precipitation performance.The experimental results showed that the most significant enhancement of hydrogen precipitation performance was obtained for the NiS2@CC-900(900 means 900 mV overpotential)sample after the ultra-high overpotential induced reconstruction.Compared with the initial overpotential of 161 mV(10 mA cm-2),the overpotential of the reconstructed sample reduced by 67 mV(42%).The characterization results showed that an ultra-high overpotential of 900 mV induced deep reconstruction of NiS2,formed highly reactive Ni/Ni3S2 heterogeneous interfaces,which is more conducive to improved HER performance and match well with theoretical calculations results.We demonstrated ultrahigh overpotential was an effective strategy to induce NiS2 deeply reconstruction and significantly improve its HER performance,and this strategy was also applicable to CoS2 and FeS2.This study provides an extremely simple and universal pathway for the reasonable construction of efficient electrocatalysts by induced TMS deeply reconstruction. 展开更多
关键词 Nickel sulfide Ultra-high overpotential induces Deep reconstruction Synergistic effect Hydrogen evolution reaction
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Effects of prior austenite and primary carbides on mechanical properties of a novel 2.5 GPa grade ultra-high strength steel 认领 引用
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作者 Yue Liu Shun Han +5 位作者 Ru-ming Geng Xue-dong Pang Yu Liu Si-min Lei Yong Li Chun-xu Wang 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2025年第7期2064-2075,共12页
The effects of prior austenite and primary carbides on the mechanical properties of a novel 2.5 GPa grade steel were investigated by treating at various solid-solution temperatures.The ultimate tensile strength and Ch... The effects of prior austenite and primary carbides on the mechanical properties of a novel 2.5 GPa grade steel were investigated by treating at various solid-solution temperatures.The ultimate tensile strength and Charpy U-notch impact energy initially increased and subsequently decreased as the solid-solution temperature rose,while the yield strength consistently decreased.The size of prior austenite grain and martensite block always increased with rising the solid-solution temperature,and austenite grain growth activation energy is 274,969 J/mol.The growth of prior austenite was restricted by primary carbides M6C and MC.The dissolution of the primary carbides not only enhanced solid-solution strengthening and secondary hardening effects but also increased the volume fraction of retained austenite.The increase in the ultimate tensile strength and Charpy U-notch impact energy was primarily attributed to the dissolution of the primary carbides M6C and MC,while the decrease was due to the increase in the size of prior austenite grain and martensite block.Exceptional combination of strength,ductility and toughness with ultimate tensile strength of 2511 MPa,yield strength of 1920 MPa,elongation of 9.5%,reduction of area of 41%and Charpy U-notch impact energy of 19.5 J was obtained when experimental steel was solid-solution treated at 1020℃. 展开更多
关键词 Ultra-high strength steel Solid-solution temperature Prior austenite M6C carbide MC carbide Mechanical property
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Processing-induced reduction in dianthrones content and toxicity of Polygonum multiflorum:Insights from ultra-high performance liquid chromatography triple quadrupole mass spectrometry analysis and toxicological assessment 认领 引用
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作者 Wan-Fang Li Ying Wang +4 位作者 Cai-Xia Qiu Jie Li Jie Bao Jian-Bo Yang Hong-Tao Jin 《Animal Models and Experimental Medicine》 CAS CSCD 2025年第4期685-695,共11页
Background:Polygonum multiflorum-induced liver injury(PM-DILI)has significantly hindered its clinical application and development.Methods:This study investigates the variation in content and toxicity of dian-thrones,t... Background:Polygonum multiflorum-induced liver injury(PM-DILI)has significantly hindered its clinical application and development.Methods:This study investigates the variation in content and toxicity of dian-thrones,the toxic components of P.multiflorum,during different processing cycles.We employed the ultra-high-performance liquid chromatography triple quadrupole mass spectrometry method to quantify six dianthrones in raw P.multiflorum and formulations processed with a method called nine cycles of steaming and sunning.Additionally,toxicity assessments were conducted using human normal liver cell line L02 and zebrafish embryos.Results:Results indicate a gradual reduction in dianthrones content with increasing processing cycles.Processed formulations exhibited significantly reduced cytotoxic-ity in L02 cells and hepatotoxicity in zebrafish embryos.Conclusions:Our findings elucidate the relationship between processing cycles and P.multiflorum toxicity,providing theoretical support for its safe use. 展开更多
关键词 dianthrones hepatotoxicity Polygonum multiflorum Thunb. ultra-high performance liquid chromatography triple quadrupole mass spectrometry(UHPLC-QQQ-MS/MS) zebrafish embryos
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Enhanced wear resistance of Ti(N,B)/AISI431 composite coating via exothermic in-situ reaction by ultra-high speed laser cladding 认领 引用
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作者 Xiao-dong Hou Nan Zhang Song-jun Zheng 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2025年第12期4377-4393,共17页
In order to enable efficient and cost-effective rehabilitation of surface-worn hydraulic supports,the synthesis and characterization of a novel Ti(N,B)/AISI431 composite coating formed on the surface of 27MnSi steel a... In order to enable efficient and cost-effective rehabilitation of surface-worn hydraulic supports,the synthesis and characterization of a novel Ti(N,B)/AISI431 composite coating formed on the surface of 27MnSi steel are explored via an exothermic in-situ reaction using the ultra-high speed laser cladding(EHLA in German)technique in combination with direct reaction synthesis(DRS).The aim is to mitigate the high residual stress and interfacial stress gradient in the remanufactured AISI431 coating on 27SiMn steel substrate and enhance surface wear resistance.The microstructure,phase composition and interface characteristics are carefully investigated.Much improved wear performance of the composite coating is revealed,mainly attributed to the in-situ formed Ti(N,B)precipitates,refined microstructure,broadened interface zone and reduced residual stress,benefited from the exothermic in-situ Ti(N,B)-reaction.The potential of combining ultra-high speed laser cladding with DRS is demonstrated to create coatings with tailored properties,providing valuable insights for developing advanced wear-resistant materials for industrial applications using EHLA. 展开更多
关键词 Ultra-high speed laser cladding Composite coating Residual stress Wear In-situ reaction
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Experimental and Numerical Study of Bonding Capacity of Interface between Ultra-High Performance Concrete and Steel Tube 认领 引用 被引量：3
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作者 Ruikun Xu Jiu Li +1 位作者 Wenjie Li Wei Zhang 《Structural Durability & Health Monitoring》 EI 2025年第2期285-305,共21页
This study investigates the bond performance at the interfacial region shared by Ultra-High Performance Concrete(UHPC)and steel tubes through push-out tests.This study examines how changes in steel fiber volumetric ra... This study investigates the bond performance at the interfacial region shared by Ultra-High Performance Concrete(UHPC)and steel tubes through push-out tests.This study examines how changes in steel fiber volumetric ratio and thickness of steel tube influence the bond strength characteristics.The results show that as the enhancement of the steel tube wall thickness,the ultimate bond strength at the interface improves significantly,whereas the initial bond strength exhibits only slight variations.The influence of steel fiber volumetric ratio presents a nonlinear trend,with initial bond strength decreasing at low fiber content and increasing significantly as fiber content rises.Additionally,finite element(FE)simulations were applied to replicate the experimental conditions,and the outcomes showed strong correlation with the experimental data,confirming the exactitude of the FE model in predicting the bond behavior at the UHPC-Steel interface.These findings provide valuable insights for optimizing the design of UHPC-Filled steel tubes in high-performance structure. 展开更多
关键词 Ultra-high performance concrete filled steel tube(UHPCFST) push-out test bonding capacity cohesive zone model
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Heterostructure engineering coupled with in situ activation enables ultra-high capacity and fast zinc-ion storage kinetics in vanadium-based cathodes 认领 引用 被引量：1
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作者 Ting Chen Qian-Hui Wu +5 位作者 Mei Shi Xin Chen Shun-Rui Luo Lei-Ming Lang Zhi-Dong Chen Huan Pang 《Rare Metals》 SCIE EI CAS CSCD 2025年第11期8500-8513,共14页
Vanadium-based materials are recognized as promising cathodes for high-energy-density aqueous zincion batteries(AZIBs).However,their inherent low intrinsic conductivities and sluggish reaction kinetics curtail their c... Vanadium-based materials are recognized as promising cathodes for high-energy-density aqueous zincion batteries(AZIBs).However,their inherent low intrinsic conductivities and sluggish reaction kinetics curtail their capacity release.Here,we enhanced the electron and ion transport properties of vanadium-based cathodes through heterojunction engineering,coupled with in situ electrochemical activation,significantly enhancing an unprecedented zinc-ion storage capacity and rapid kinetic performance.A heterostructured V2O3/g-C3N4(V2O3/CN)precursor was synthesized via a calcination process firstly.When employed as a cathode in AZIBs,this precursor undergoes an in situ phase transformation into Zn3(OH)2-V2O7-2H2O/C3N4(ZVOH/CN)during the inaugural charging process,while retaining its heterojunction structure.Both electrochemical assessments and theoretical calculations revealed that ZVOH/CN exhibits superior zinc-ion adsorption and migration capabilities compared to conventional vanadium-based cathodes.The formation of the heterojunction amplifies the material's electronic conductivity and ion diffusion kinetics.As a result,the optimal ZVOH/CN composite electrode showcases a remarkable capacity of 518.5 mAh g-1at 0.5 A g-1,superior rate performance of 177.8 mAh g-1at 20 A g-1,and impressive cycling stability.This work offers a novel design strategy for vanadium-based composite materials as highperformance AZIB cathodes. 展开更多
关键词 Aqueous zinc-ion batteries Vanadium oxide Heterostructure engineering In situ activation Ultra-high capacity and rate performance
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Clinical translation of ultra-high dose rate flash radiotherapy:Opportunities,challenges,and prospects 认领 引用 被引量：1
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作者 Xiang-Xiang Yang Hui Luo +2 位作者 Jia-Jun Zhang Heng Ge Liang Ge 《World Journal of Radiology》 2025年第4期1-11,共11页
Ultra-high dose rate flash radiotherapy(FLASH-RT)has attracted wide attention in the field of radiotherapy in recent years.For FLASH-RT,radiation is delivered at a very high dose rate[usually thousands of times compar... Ultra-high dose rate flash radiotherapy(FLASH-RT)has attracted wide attention in the field of radiotherapy in recent years.For FLASH-RT,radiation is delivered at a very high dose rate[usually thousands of times compared with conventional radiotherapy(CONV-RT)]in an extremely short time.This novel irradiation technique shows a protective effect on normal tissues,also known as the flash effect.At the same time,FLASH-RT is comparable to CONV-RT in terms of tumorkilling efficacy.As basic research dedicates to uncover the mechanisms by which FLASH-RT reduces radiation-induced normal tissue damage,clinical trials of FLASH-RT have been gradually conducted worldwide.This article systematically reviews the evidence of the feasibility and safety of FLASH-RT in clinical practice and offers insights into the future translation of this technology in clinic. 展开更多
关键词 Ultra-high dose rate flash radiotherapy Mechanism Clinical translation Radiation-induced damage to normal tissues Prospects
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Dynamic mechanical behavior of ultra-high strength steel fabricated by laser additive manufacturing:Influence of energy density 认领 引用
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作者 Xiaoyu Gong Zhengqing Zhou +6 位作者 Dayong Li Zhiyang Fan Zhiming Bai Bin Hu Yageng Li Jia Liu Wenyue Zheng 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2025年第10期2495-2509,共15页
Ultra-high strength steel(UHSS)fabricated via laser additive manufacturing(LAM)holds significant promise for applications in defense,aerospace,and other high-performance sectors.However,its response to high-impact loa... Ultra-high strength steel(UHSS)fabricated via laser additive manufacturing(LAM)holds significant promise for applications in defense,aerospace,and other high-performance sectors.However,its response to high-impact loading remains insufficiently understood,particularly regarding the influence of energy density on its dynamic mechanical behavior.In this study,scanning electron micro-scopy,electron backscatter diffraction,and image recognition techniques were employed to investigate the microstructural variations of LAM-fabricated UHSS under different energy density conditions.The dynamic mechanical behavior of the material was characterized using a Split Hopkinson Pressure Bar system in combination with high-speed digital image correlation.The study reveals the spatiotemporal evolution of surface strain and crack formation,as well as the underlying dynamic fracture mechanisms.A clear correlation was established between the microstructures formed under varying energy densities and the resulting dynamic mechanical strength of the material.Results demonstrate that optimal material density is achieved at energy densities of 292 and 333 J/mm3.In contrast,energy densities exceeding 333 J/mm3 induce keyhole defects,compromising structural integrity.Dynamic performance is strongly dependent on material density,with peak impact resistance observed at 292 J/mm3-where strength is 8.4%to 17.6%higher than that at 500 J/mm3.At strain rates≥2000 s-1,the material reaches its strength limit at approximately 110μs,with the initial crack appearing within 12μs,followed by rapid failure.Conversely,at strain rates≤1500 s-1,only microcracks and adiabatic shear bands are detected.A transition in fracture surface morphology from ductile to brittle is observed with increasing strain rate.These findings offer critical insights into optimizing the dynamic mechanical properties of LAM-fabricated UHSS and provide a valuable foundation for its deployment in high-impact environments. 展开更多
关键词 ultra-high strength steel additive manufacturing Split-Hopkinson Pressure Bar high-speed photography digital image cor-relation
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Influence of refined hierarchical martensitic microstructures on yield strength and impact toughness of ultra-high strength stainless steel 认领 引用 被引量：41
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作者 Haiwen Luo Xiaohui Wang +1 位作者 Zhenbao Liu Zhiyong Yang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2020年第16期130-136,共7页
The hierarchical martensitic features in ultra-high strength stainless steel(UHSSS),including the prior austenite grains,martensite packets,blocks and laths with the descending size,were refined to various extents by ... The hierarchical martensitic features in ultra-high strength stainless steel(UHSSS),including the prior austenite grains,martensite packets,blocks and laths with the descending size,were refined to various extents by employing different thermomechanical processes and then carefully characterized.Their relation to yield strength and impact toughness was analyzed.We conclude that the refinement of martensitic structures could lead to the significant increase of yield strength,which follows the Hall-Petch relation with the effect grain size defined by high angle boundaries(HABs).Impact toughness of UHSSS depends on the frequency and capability for retained austenite(RA)grains at both HABs and martensite lath boundaries to trap the propagating cracks via strain-induced transformation,in which the film-like RA grains at lath boundaries appear to make the greater contribution. 展开更多
关键词 Ultra-high strength stainless steel Martensite Yield strength Impact toughness retained austenite
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