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Study on the destabilizing damage precursors of cemented tailings backfill based on critical slowing down theory combined with multiple denoising algorithms under consideration of initial defect conditions 认领 引用 被引量：1
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作者 ZHAO Kang ZHONG Jun-cheng +3 位作者 YAN Ya-jing LIU Yang WEN Dao-tan XIAO Wei-ling 《Journal of Central South University》 SCIE EI CAS CSCD 2026年第1期375-399,共25页
The cemented tailings backfill(CTB)with initial defects is more prone to destabilization damage under the influence of various unfavorable factors during the mining process.In order to investigate its influence on the... The cemented tailings backfill(CTB)with initial defects is more prone to destabilization damage under the influence of various unfavorable factors during the mining process.In order to investigate its influence on the stability of underground mining engineering,this paper simulates the generation of different degrees of initial defects inside the CTB by adding different contents of air-entraining agent(AEA),investigates the acoustic emission RA/AF eigenvalues of CTB with different contents of AEA under uniaxial compression,and adopts various denoising algorithms(e.g.,moving average smoothing,median filtering,and outlier detection)to improve the accuracy of the data.The variance and autocorrelation coefficients of RA/AF parameters were analyzed in conjunction with the critical slowing down(CSD)theory.The results show that the acoustic emission RA/AF values can be used to characterize the progressive damage evolution of CTB.The denoising algorithm processed the AE signals to reduce the effects of extraneous noise and anomalous spikes.Changes in the variance curves provide clear precursor information,while abrupt changes in the autocorrelation coefficient can be used as an auxiliary localization warning signal.The phenomenon of dramatic increase in the variance and autocorrelation coefficient curves during the compression-tightening stage,which is influenced by the initial defects,can lead to false warnings.As the initial defects of the CTB increase,its instability precursor time and instability time are prolonged,the peak stress decreases,and the time difference between the CTB and the instability damage is smaller.The results provide a new method for real-time monitoring and early warning of CTB instability damage. 展开更多
关键词 initial defects cemented tailings backfill critical slowing down acoustic emission RA/AF values denoising algorithms
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Energy-Based Deep Learning Initialization Method Achieves Precise Evolution of Soliton Dynamics 认领 引用
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作者 Zhiyang Zhang Muwei Liu +3 位作者 Xiaowei Xing Kaixiang Zhang Xiwei Huang Wenjun Liu 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第7期45-54,共10页
The precise modeling of strong nonlinear transient evolution in nonlinear dynamical systems,including soliton evolution,remains a long-term challenge.Deep learning models with powerful nonlinear fitting capabilities h... The precise modeling of strong nonlinear transient evolution in nonlinear dynamical systems,including soliton evolution,remains a long-term challenge.Deep learning models with powerful nonlinear fitting capabilities have become efficient tools for physical system modeling.However,existing initialization methods rely on statistical distribution assumptions and lack constraints from physical mechanisms,which easily lead to suboptimal solutions and severely limit model prediction accuracy and generalization.Based on the energy minimization principle of physical systems,this work proposes energy-based initialization(EBI).This method requires only prior structural knowledge of the physical system as input,without experimental data or architecture customization,to guide initial weights to align with the intrinsic dynamical structure of physical systems.The work further derives an upper bound on the distance between EBI initial weights and optimal weights for downstream tasks,and proves that its performance advantage increases monotonically with the expansion of model parameter scale.Validation across four typical physical scenarios shows that EBI outperforms classical initialization schemes across all metrics,while initialization for a model with 4.7 million parameters takes less than 5 minutes.This work fills the gap of specialized initialization methods in AI for physics,provides efficient support for tasks such as transient prediction of optical fiber laser and inverse sensing of laser structures,and is expected to open new directions for interdisciplinary research between artificial intelligence and physics. 展开更多
关键词 physical system modelinghoweverexisting initialization methods physical system modeling soliton dynamics learning models statistical distribution assumptions energy based initialization deep learning
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The Well and Box Types Initial Value Problems of the Defocusing mKdV Equation 认领 引用
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作者 Yuhan Ye Juanjuan Wu 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第4期1-6,共6页
We study the time evolution problems of special initial values with two discontinuities for the defocusing mKdV equation.Based on the finite-gap integral method,Whitham modulation system of the defocusing m Kd V equat... We study the time evolution problems of special initial values with two discontinuities for the defocusing mKdV equation.Based on the finite-gap integral method,Whitham modulation system of the defocusing m Kd V equation is derived in the form of Riemann invariants,and full-time evolution results for six types of initial values with two discontinuities are obtained in detail.The regions where rarefaction waves interact with dispersive shock waves are thoroughly analyzed.Two novel phenomena,namely soliton trains and linear wave packets,are identified and their intrinsic mechanisms are systematically illustrated.All the results are verified by numerical simulations. 展开更多
关键词 time evolution problems soliton trai box type initial value problems dispersive shock waves well type initial value problems rarefaction waves defocusing m kd v equation riemann invariantsand
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Creep properties and acoustic emission characteristics of soft-hard interbedded rock masses with different initial damage 认领 引用
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作者 MIAO Shuai-sheng SU Li-jun +2 位作者 ZHANG Chong-lei PAN Yong-liang TIAN Hong-yan 《Journal of Central South University》 SCIE EI CAS CSCD 2026年第1期276-298,共23页
To investigate the long-term stability of soft-hard interbedded rock masses with initial damage induced by earthquakes and periodic drying and wetting,this study prepared samples with different initial damage through ... To investigate the long-term stability of soft-hard interbedded rock masses with initial damage induced by earthquakes and periodic drying and wetting,this study prepared samples with different initial damage through cyclic loading and unloading(CLU)experiments followed by cyclic drying and wetting(CDW)experiments,and finally conducted creep experiments.The study analyzed the effects of initial damage on creep mechanical behavior,crack evolution,and explored failure precursor information,revealing the damage failure mechanisms.The results show that the structural characteristics of the rock mass control its macroscopic failure mode.Initial damage promotes microcrack development,influences the fracture mode,and increases the proportion of high-frequency(200−280 kHz)acoustic emission events during creep.Meanwhile,initial damage exacerbates creep characteristics,increasing the creep rate,shortening total creep failure time,and reducing long-term strength.The damage failure is attributed to:the generation of internal cracks and pores in the rock caused by CLU;mineral hydrolysis and expansion-contraction due to CDW,resulting in weakened intergranular cementation;and full development of cracks and pores under creep stress.Additionally,the deformation difference coefficient and the coefficient of variation of RA/AF values can serve as precursor indicators for creep failure. 展开更多
关键词 creep properties initial damage soft-hard interbedded rock mass acoustic emission failure precursors damage failure mechanism
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Monotonic triaxial testing and hypoplastic modelling of calcareous sand:A focus on particle breakage and initial relative density 认领 引用
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作者 Jiarui Chen Yaolan Tang +4 位作者 Shun Wang Chunshun Zhang Wei Wei Jie Dong Congying Li 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第2期1504-1525,共22页
The stress-strain behavior of calcareous sand is significantly influencedby particle breakage(B)and initial relative density(Dri),but few constitutive models consider their combined effects.To bridge this gap,we condu... The stress-strain behavior of calcareous sand is significantly influencedby particle breakage(B)and initial relative density(Dri),but few constitutive models consider their combined effects.To bridge this gap,we conducted a series of triaxial tests on calcareous sand with varying Dri and stress paths,examining particle breakage and critical state behavior.Key findingsinclude:(1)At a constant stress ratio(η),B follows a hyperbolic relationship with mean effective stress(p'),and for a given p',B increases proportionally withη;(2)The critical state line(CSL)moves downward with increasing Dri,whereas the critical state friction angle(φcs)decreases with increasing B.Based on these findings,we propose a unifiedbreakage evolution model to quantify particle breakage in calcareous sand under various loading conditions.Integrating this model with the Normal Consolidation Line(NCL)and CSL equations,we successfully simulate the steepening of NCL and CSL slopes as B increases with the onset of particle breakage.Furthermore,we quantitatively evaluate the effect of B onφcs.Finally,within the framework of Critical State Soil Mechanics and Hypoplasticity theory,we develop a hypoplastic model incorporating B and Dri.The model is validated through strong agreement with experimental results across various initial relative densities,stress paths and drainage conditions. 展开更多
关键词 Calcareous sand Constitutive model Hypoplasticity Particle breakage Initial relative density Triaxial test
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Effect of initial fracture angle on the failure pattern and gas flow channel of sandstone under multistage loading 认领 引用
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作者 Quanle Zou Feixiang Lv +4 位作者 Zihan Chen Qingsong Li Jianjun Zhao Qican Ran Qingmiao Li 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第3期2142-2157,共16页
After coal seam mining,the overlying rock strata above the goaf are subjected to long-term stress and eventually undergo failure.Under mining-induced disturbances,the strata develop fractures at various angles,which s... After coal seam mining,the overlying rock strata above the goaf are subjected to long-term stress and eventually undergo failure.Under mining-induced disturbances,the strata develop fractures at various angles,which significantly influence failure modes and the morphology of gas flow channels.This study employed multistage loading experiments,numerical simulations,three-dimensional reconstruction,and image recognition to investigate the fragmentation process of rocks with different initial fracture angles under multistage loading.The results show that variations in the initial fracture angle affect the transmission of contact forces among rock particles.As the angle increases,the transmission pattern shifts from a uniform distribution to one extending along the direction of the fracture.Rocks with small initial fracture angles tend to experience tensile-dominated failure,with most of the material subjected to longitudinal loading,resulting in reduced strength.Fractures propagate from the central region of the initial fracture,producing a complex internal fracture network.The proportion of fracture channels varies considerably across regions,creating multiple zones of velocity variation in the gas flow.In contrast,rocks with large initial fracture angles are more susceptible to shear failure,with the primary load-bearing zones aligned along the inclined fracture direction.As a result,the influence on surrounding regions is limited,improving the rock's load-bearing capacity under multistage loading.In these cases,the distribution and proportion of fracture channels become more uniform,promoting more stable gas flow within the channels.Overall,these findings provide theoretical insights into how initial fracture angles govern rock failure patterns and gas flow characteristics. 展开更多
关键词 Multistage loading Initial fracture angle Failure pattern Gas flow characteristics Three-dimensional fracture reconstruction
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Influence of key initial parameters on reshocked RichtmyerMeshkov instability 认领 引用
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作者 Jun Wang Yongrui Deng +2 位作者 Yong Zhao Juchun Ding Xisheng Luo 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第4期596-609,共14页
This paper presents an experimental and theoretical study on Richtmyer-Meshkov instability at a light/heavy single-mode gaseous interface under reflected shock wave(reshock)conditions.Particular emphasis is placed on ... This paper presents an experimental and theoretical study on Richtmyer-Meshkov instability at a light/heavy single-mode gaseous interface under reflected shock wave(reshock)conditions.Particular emphasis is placed on the influence of initial conditions(including shock strength,interface density ratio,and amplitude-to-wavelength ratio)on the perturbation growth following reshock.The results reveal that,for all cases,the interface amplitude exhibits a long-term linear growth with time after reshock,followed by a rapid decay in growth rate,highly similar to the perturbation growth behavior after single shock.Higher Mach numbers intensify transverse wave interactions with the interface,significantly affecting the interface morphology.Additionally,the interface is driven closer to the end wall,increasing the frequency of interactions between reverberating waves and the interface.This results in significantly enhanced mixing,as evidenced by the notably larger interface thickness,making the prediction of post-reshock growth rates across varying shock strengths particularly challenging.Interfaces with different density ratios demonstrate similar growth patterns,with the normalized perturbation growth showing near independence from the density ratio.As the amplitude-towavelength ratio increases,distinct transverse shock waves are generated after reshock,which produce high-pressure regions near the interface,causing the bubble head to present a cavity structure.For all cases,the early-stage post-reshock perturbation growth,when appropriately normalized,collapses well at the early stage but diverges at the late stage,especially for cases with varying Mach numbers.The linear superposition model,incorporating a reduction factor,effectively predicts the post-reshock growth rate for cases with different density ratios and initial amplitudes but loses precision for cases with varying shock strengths.Among existing models,the Sadot model(Sadot et al.1998)offers the most reliable predictions for late-stage post-reshock perturbation growth. 展开更多
关键词 Richtmyer-Meshkov instability Reshock Initial conditions
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A Method for Improving Initial Attack with Deployment Strategy for Firefighting Water Reserve Points 认领 引用
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作者 Long Zhang Kaiwen Zhou +1 位作者 Weihao Bao Fuquan Zhang 《International Journal of Disaster Risk Science》 SCIE CSCD 2026年第3期663-677,共15页
When a forest fire occurs,timely and effective initial attacks can control the fire in its early stages,reducing the risk of spread and minimizing disaster losses.Enhancing the efficiency of forest fire suppression an... When a forest fire occurs,timely and effective initial attacks can control the fire in its early stages,reducing the risk of spread and minimizing disaster losses.Enhancing the efficiency of forest fire suppression and the success rate of initial attacks has become a critical issue.Therefore,this study thoroughly investigated the key factors of the initial attack phase of forest fires,employing the weighted cross-entropy similarity and relative entropy models,combined with Geographic Information Systems(GIS)and machine learning technologies for precise simulation and analysis.The research introduced additional firefighting water reserve points in the study area to enhance the suppression capability and efficiency of unit firefighting resources,thereby increasing the success rate of the initial attack and reducing the losses caused by fires.An empirical study in Xichang City,Sichuan Province,China,demonstrated that this method significantly improves the success rate of initial attacks.Simulation results indicate that,under various weather conditions,especially extreme weather,the newly established firefighting water reserve points greatly enhance the success rate of initial attacks.This approach not only aids in the scientific planning of firefighting resources but also provides a practical foundation and theoretical guidance for future research to further improve the success rate of initial attacks. 展开更多
关键词 Firefighting Initial attacks Relative entropy Weighted cross-entropy Wildfire
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Multivariate Adjustment in the IAU-Based Tropical Cyclone Initialization Scheme in the TRAMS Model 认领 引用
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作者 Shaojing ZHANG Jeremy Cheuk-Hin LEUNG +6 位作者 Daosheng XU Liwen WANG Yuxiao CHEN Yanyan HUANG Suhong MA Wenshou TIAN Banglin ZHANG 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2026年第2期436-450,I0027-I0031,共15页
The operational Tropical Regional Atmospheric Model System(TRAMS)often underestimates initial typhoon intensity when using the global analysis field as the initial condition.The TRAMS tropical cyclone(TC)initializatio... The operational Tropical Regional Atmospheric Model System(TRAMS)often underestimates initial typhoon intensity when using the global analysis field as the initial condition.The TRAMS tropical cyclone(TC)initialization scheme,developed based on the incremental analysis updates(IAU)technique,effectively reduces initial bias.However,the original IAU-based TC initialization scheme only adjusts the wind field at the analysis moment,with other variables adjusted implicitly under the model's constraints according to a gradually inserted wind increment(named“univariate adjustment scheme”hereafter).The univariate adjustment scheme requires approximately 3 h to reach a dynamic equilibrium state,which constrains the assimilation of hourly TC observations and causes excessive dissipation of meaningful short-wave information in adjustment increments.To address this limitation,this study develops a multivariate adjustment IAU-based TC initialization scheme that incorporates gradient wind balance and hydrostatic balance as its largescale constraints.Numerical experiments with TC Hato(2017)demonstrate that the multivariate adjustment scheme reduces the IAU relaxation time to 1 h while marginally improving forecast skill.These findings are consistently replicated across 12 additional TC cases.The development of the IAU-based multivariate adjustment initialization scheme establishes a foundation for 4-D initialization using hourly TC observations. 展开更多
关键词 tropical cyclone initialization multivariate adjustment incremental analysis updates numerical prediction
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Asymmetric Voltage Vector-based Initial Rotor Position Detection in Four-switch Inverter Fed BLDC Motors 认领 引用
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作者 Xinmin Li Kun Liu +2 位作者 Lu Zhou Tingna Shi Wei Chen 《CES Transactions on Electrical Machines and Systems》 EI CSCD 2026年第1期77-86,共10页
In position-sensorless brushless direct current(DC)motors(BLDCMs)fed by a four-switch three-phase(FSTP)inverter,only two phases are fully controlled,while the remaining phase is tied to the midpoint of the split DC-li... In position-sensorless brushless direct current(DC)motors(BLDCMs)fed by a four-switch three-phase(FSTP)inverter,only two phases are fully controlled,while the remaining phase is tied to the midpoint of the split DC-link capacitors.The voltage pulses required by inductance-based initial position detection can cause unequal discharge of the series capacitors,shifting the neutral-point voltage away from half of DC-link voltage(Udc/2).This neutral-point drift breaks the spatial symmetry of the inverter voltage vectors,so the 360°electrical period can no longer be evenly partitioned into six sectors during initial rotor position detection.To address this issue,this paper proposes a detection-pulse injection sequence that explicitly accounts for the asymmetric voltage vectors of the FSTP inverter.With the proposed sequence,the initial rotor position can be identified within a 30°electrical sector.The method requires no additional voltage or current sensors,and experimental results confirm its feasibility. 展开更多
关键词 Brushless direct current(DC)motor(BLDCM) Four-switch three-phase(FSTP)inverter Asymmetric voltage vector Initial position detection
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Mechanical behavior and acoustic emission characteristics of initially damaged coal under triaxial cyclic loading and unloading 认领 引用 被引量：1
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作者 Qican Ran Yunpei Liang +5 位作者 Quanle Zou Chunfeng Ye Zihan Chen Tengfei Ma Zhaopeng Wu Bichuan Zhang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第1期230-245,共16页
During deep coal mining,an instability failure of coal usually occurs under the combined effect of initial damage and triaxial cyclic loading and unloading(TCLU).Therefore,this study investigated the impact of initial... During deep coal mining,an instability failure of coal usually occurs under the combined effect of initial damage and triaxial cyclic loading and unloading(TCLU).Therefore,this study investigated the impact of initial damage on mechanical behavior and acoustic emission(AE)characteristics of coal under TCLU.Initial damage variables(IDVs)of coal specimens were quantified using preloading,followed by TCLU experiments to assess the deformation,energy distribution,and fracture development.The results revealed that the increase in IDVs significantly reduced the structural integrity of coal specimens,increased the cumulative irreversible strain,and enhanced the dissipated energy owing to microfracture expansion.Moreover,AE monitoring showed earlier activation of fractures and a higher occurrence of large-scale rupture events of coal specimens with high IDVs,which correlated with decreasing AE b values(reflecting the different scales of fracture within specimens)and increasing S values(reflecting the AE activity within specimens).Additionally,computed tomography analysis revealed intensified fracture networks and increasing three-dimensional fractal dimensions of coal specimens with higher IDVs.Finally,the coupling effect of TCLU and initial damage on the weakening mechanism of coal was investigated.Initial damage significantly reduced the structural integrity of coal by increasing the number of weak planes within coal specimens,contributing to the earlier activation and rapid expansion of fractures at low stress levels under TCLU and eventually accelerating the weakening process of coal.This study provides a scientific basis and theoretical support for the prevention and control of dynamic disasters in deep coal mining. 展开更多
关键词 Triaxial cyclic loading Initially damaged coal Linear energy storage(LES) Acoustic emission(AE) Computed tomography(CT)
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Analysis of steel-slag-air multiphase flow and initial solidification in a slab mold with argon blowing 认领 引用
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作者 Wei-Yang Zha Hua Zhang +4 位作者 Jian-Hao Wang Peng-Sheng Lu Zheng-Chao Huang Zhi-Hui Ji Qing Fang 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第4期400-413,共14页
A combined approach of numerical simulation and water model experiments was employed to investigate the steel-slag-air multiphase flow behavior and initial solidification characteristics in a 200 mm×1248 mm slab ... A combined approach of numerical simulation and water model experiments was employed to investigate the steel-slag-air multiphase flow behavior and initial solidification characteristics in a 200 mm×1248 mm slab mold with varying submerged entry nozzle(SEN)inclination angles and argon-blowing rates.The results demonstrated that as the argon-blowing rate increases from 0 to 15 L/min,the fluctuation amplitude at the steel-slag interface expands from 6.4 to 14.3 mm.When the argon-blowing rate ranges between 0 and 10 L/min,the shell thickness at both narrow and wide faces increases from 6.68 and 23.1 to 12.38 and 27.11 mm,respectively,but excessive blowing rates lead to shell thinning.The steel exposure behavior is eliminated as the SEN is inclined downward.As the SEN inclination angle decreases from upward 12°to downward 15°,the relationship between the SEN inclination angle and shell thickness growth exhibits nonlinear characteristics.The shell thickness at mold out ranges from 9.71 to 20 mm at the narrow face and 12.49 to 27 mm at the wide face.The superior parameters are with 10 L/min argon flow and 12°downward nozzle inclination,delivering no slay layer while achieving mold exit shell thicknesses of 11.63 mm at the narrow face and 26.5 mm at the wide face. 展开更多
关键词 Mold Submerged entry nozzle Argon blowing Multiphase flow Initial solidification
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A Na2Ti3O7/Na2Ti2O5 biphasic architecture enabling record-high initial coulombic efficiency and 10,000-cycle durability 认领 引用
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作者 Mushun Chen Yichao Wang +4 位作者 Zhichao Li Fuqiang Li Shouyu Sun Cheng Yang Yu Liu 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第7期314-323,I0009,共10页
Layered sodium titanates are promising anode candidates for sodium-ion batteries(SIBs)owing to their intrinsic safety and structural stability.However,they typically suffer from significant structural reconstruction a... Layered sodium titanates are promising anode candidates for sodium-ion batteries(SIBs)owing to their intrinsic safety and structural stability.However,they typically suffer from significant structural reconstruction and interfacial instability during the initial cycling,leading to low initial Coulombic efficiency(ICE)and limited reversibility.In this work,we report a biphasic sodium titanate composed of Na2Ti2O5 and Na2Ti3O7 for the first time,synthesized via a facile solid-state route,which enables precise regulation of the initial sodiation behavior.The synergistic interaction between the two phases not only establishes a stable and reproducible Na+storage pathway from the first cycle but also effectively suppresses the formation of transient intermediate species and the accumulation of irreversible reactions,thereby significantly enhancing ICE.Operando analyses reveal that the biphasic architecture exhibits minimal structural strain and stabilized interfacial evolution,avoiding repeated lattice adjustments and stress concentration during long-term cycling.As a result,carbon-coated biphasic sodium titanate achieves an ICE of 90.5%,the highest value reported to date for sodium titanate-based anodes.It also achieves a high reversible capacity of 109 m Ah g-1 at a high current density of 2000 mA g-1 and excellent cycling stability with suppressed structural degradation.Notably,no sodium plating is observed even after 10,000 cycles at 2000 mA g-1,which highlights its outstanding safety and durability.This work proposes a new strategy for regulating the initial-cycle reaction based on biphasic synergy.Without the need for complex chemical modification,it regulates the initial-cycle sodium storage behavior from the essence of the reaction,and simultaneously achieves breakthroughs in ICE and long-term stability,providing a new idea for the practical design of layered oxide anode materials. 展开更多
关键词 Sodium-ion batteries Sodium titanate Mixed-phase High initial Coulombic efficiency
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Effects of initial spin orientation on the generation of polarized electron beams from laser wakefield acceleration in plasma 认领 引用
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作者 L.R.Yin X.F.Li +6 位作者 Y.J.Gu N.Cao Q.Kong M.Büscher S.M.Weng M.Chen Z.M.Sheng 《Matter and Radiation at Extremes》 SCIE EI CAS CSCD 2026年第1期20-28,共9页
The effects of initial spin orientation on the final electron beam polarization in laser wakefield acceleration in a pre-polarized plasma are investigated theoretically and numerically.From the results of variation of... The effects of initial spin orientation on the final electron beam polarization in laser wakefield acceleration in a pre-polarized plasma are investigated theoretically and numerically.From the results of variation of the initial spin direction,the spin dynamics of the electron beam are found to depend on the self-injection mechanism.The effects of wakefields and laser fields are studied using test particle dynamics and particle-in-cell simulations based on the Thomas-Bargmann-Michel-Telegdi equation.Compared with transverse injection,longitudinal injection is found to be preferable for obtaining a highly polarized electron beam. 展开更多
关键词 spin dynamics laser fields test particle dynamics initial spin orientation electron beam laser wakefield acceleration electron beam polarization
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Orbital hybridization states of carbon assisted robust inorganic-rich solid electrolyte interphase towards high initial coulombic efficiency hard carbon anode 认领 引用
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作者 Zeren Zhou Yixiang Zhang +4 位作者 Qixian Zhang Qiaoyan Lin Yong Shuai Zhijiang Wang Lishuang Fan 《Chinese Chemical Letters》 SCIE CAS CSCD 2026年第2期540-544,共5页
Hard carbon is a vital anode material for sodium-ion batteries;however,the nonuniform growth of solid electrolyte interphase(SEI)film substantially diminishes its initial coulombic efficiency(ICE)and cycle life.The ch... Hard carbon is a vital anode material for sodium-ion batteries;however,the nonuniform growth of solid electrolyte interphase(SEI)film substantially diminishes its initial coulombic efficiency(ICE)and cycle life.The chemical and morphological properties of surface highly influence the electrode/electrolyte interfacial reactions.In this study,we have tuned orbital hybridization states forming an interface enriched with sp2 hybridized carbon(sp2-C),which decreases the binding energy to solvent molecules and inhibits excessive solvent decomposition during SEI formation.Benefiting from successfully constructed inorganic-rich SEI,the ICE increased to 91%and sodium storage capacity reached 346 mAh/g.Besides,the capacity retention rate was 90.7%after 700 cycles at 1 A/g higher than pristine electrode(83.8%). 展开更多
关键词 Sodium-ion battery Hard carbon Orbital hybridization Solid electrolyte interphase Initial Coulombic efficiency
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Robust angle-only initial orbit determination in cislunar space:A state transition tensors-enhanced two-sided shooting approach 认领 引用
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作者 Jiawei WU Haibin SHANG +2 位作者 Ai GAO Xuefen ZHANG Zichen ZHAO 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第6期598-619,共22页
Initial Orbit Determination(IOD)is critical for cislunar space domain awareness but faces challenges due to the complex,non-Keplerian dynamics of the cislunar environment.This paper proposes a novel angle-only IOD met... Initial Orbit Determination(IOD)is critical for cislunar space domain awareness but faces challenges due to the complex,non-Keplerian dynamics of the cislunar environment.This paper proposes a novel angle-only IOD method tailored for cislunar space-based optical platforms,which consists of two core techniques.First,the iterative mechanism of IOD approaches is improved.The forward–backward shooting technique is employed to construct a state correction model that utilizes observation fitting constraints and state continuity constraints at the intermediate observation points to correct the unknown target’s state parameters at both endpoint observation epochs.Compared with traditional one-way shooting methods,this model mitigates sensitivity from long-term propagation,thereby enhancing IOD convergence.Second,higher-order orbital nonlinearities are explicitly characterized.State transition tensors are introduced to formulate a second-order mapping from constraint deviations to state corrections.This yields more accurate corrections and wider convergence area than linearization-based methods.Numerical results demonstrate that the proposed method ensures robust convergence against initial guess errors,observation noise,and configuration variations,and can easily integrate additional observations to resolve multi-solution problem.Finally,an analytical state uncertainty estimation is derived to quantify the uncertainty of IOD results,which is further refined by the second-order extended Kalman filter incorporating additional observations. 展开更多
关键词 Angle-only observation Cislunar space Initial orbit determination State transition tensors Uncertainty analysis
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Exploring typhoon prediction and convective bursts through integration of a numerical model after vortex initialization with AI weather forecasting 认领 引用
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作者 Jinfeng Huang Shuai Yang Yuanfa Gong 《Atmospheric and Oceanic Science Letters》 CAS CSCD 2026年第2期1-7,共7页
Typhoon Bebinca in 2024 experienced a nearshore outbreak(a rapid intensification(RI)near the coast),making accurate forecasting of unpredictable tracks and intensities highly challenging.The AI model is superior to th... Typhoon Bebinca in 2024 experienced a nearshore outbreak(a rapid intensification(RI)near the coast),making accurate forecasting of unpredictable tracks and intensities highly challenging.The AI model is superior to the numerical model for typhoon track prediction but performs worse for intensity forecasting.Vortex initialization is an effective approach to further improve numerical prediction via cycle assimilation,accounting for multiple relocating TC centers and adjusting the typhoon initial structure.In addition,by integrating numerical runs with an AI weather model through real-time dynamic weight correction of the forecast,the predictive skill is further improved.For example,it can reduce the deviation of 72-h track forecasting by 25%compared with the numerical model and decrease the intensity deviation by 2%and 56%relative to the numerical run and AI forecasts,respectively.On the basis of the best-performing forecasting,the inner-core convective burst(CB)characteristics are illuminated.The attributions of the nearshore outbreak and RI of Typhoon Bebinca are examined.From the viewpoint of bottom-up convection growth,the CB is associated with the energy supply from the high-boundarylayer CAPE,the following upward-developing secondary circulation,and accompanying latent heat release of hydrometeors.The contracted radius of maximum winds(RMW)and increased inertial stability within the inner core region effectively prevent the escape of the high-energy atmosphere and favor rapid intensification and maintenance of the offshore burst of a typhoon.The intensifying secondary circulation further promotes the primary circulation of the TC and RI processes through the gradient wind balance. 展开更多
关键词 Vortex initialization Convective bursts Typhoon
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The blow-up of solutions for porous medium equations with viscoelastic term under positive initial energy 认领 引用
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作者 WU Xiu-lan ZHAO Ya-xin YANG Xiao-xin 《Applied Mathematics(A Journal of Chinese Universities)》 SCIE CSCD 2026年第1期120-126,共7页
This paper deals with homogeneous Dirichlet boundary value problem to a class of porous medium equations with viscoelastic term ∂u/∂t-Δum+∫t0g(t-s)Δum(x,s)ds=up,x∈Ω,t≥0,where p>m(m>0).We pro... This paper deals with homogeneous Dirichlet boundary value problem to a class of porous medium equations with viscoelastic term ∂u/∂t-Δum+∫t0g(t-s)Δum(x,s)ds=up,x∈Ω,t≥0,where p>m(m>0).We prove that the weak solutions of the above problem blow up in finite time when the initial energy is positive and the function g satisfies suitable conditions.Our result generalizes that of S.A.Messaoudi in[1]. 展开更多
关键词 porous medium viscoelastic term blow up positive initial energy
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Critical commentary on initial lurasidone dosing strategies in acute schizophrenia 认领 引用
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作者 Hao-Yu Xing Juan Yan 《World Journal of Psychiatry》 SCIE 2026年第3期381-385,共5页
This letter critically examines the study by Liu et al comparing 40 mg/day and 80 mg/day initial lurasidone doses in Chinese patients with acute schizophrenia.The analysis focuses on the study’s pragmatic design,safe... This letter critically examines the study by Liu et al comparing 40 mg/day and 80 mg/day initial lurasidone doses in Chinese patients with acute schizophrenia.The analysis focuses on the study’s pragmatic design,safety outcomes,and early efficacy trends,including the paradoxical observation of greater weight gain at lower doses.By contextualizing the study’s findings within existing antipsychotic dosing literature,this commentary discusses implications for personalized treatment,while addressing methodological limitations.The letter aims to stimulate further research on optimal dosing strategies in real-world settings. 展开更多
关键词 Lurasidone Schizophrenia Initial dose Safety Efficacy Pragmatic trial
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Addressing the Ultra-Central Puzzle with Initial-State Nuclear Structures 认领 引用
20
作者 Qi Wang Long-Gang Pang Xin-Nian Wang 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第2期24-31,共8页
Hydrodynamic models fail to describe the near-equalυ3/υ2ratio observed in ultra-central heavy-ion collisions,despite their success in other centrality classes.This failure can not be resolved by adjusting the ... Hydrodynamic models fail to describe the near-equalυ3/υ2ratio observed in ultra-central heavy-ion collisions,despite their success in other centrality classes.This failure can not be resolved by adjusting the shear viscous coefficient,as shear viscosity suppresses higher-order anisotropic flows more strongly,leading to an underestimation ofυ3whenυ2matches experimental data.To address this issue,we explore two initial-state modifications to resolve this puzzle:(1)impose a minimum distance between nucleons to simulate the homogenization effect arising from short-range nucleon–nucleon repulsion;and(2)introduce sub-nucleonic structures,specifically“hot spots”within protons,to provide a more refined description of initial-state fluctuations.Using TRENTo initial conditions and 3+1D viscous hydrodynamic model CLVisc,both approaches significantly lower geometric eccentricity,reduce required viscosity,and narrow theυ2-υ3gap in ultra-central collisions.Our results implicate initial-state nuclear and sub-nucleon structures as critical factors in addressing this puzzle.Resolving it would advance nuclear structure studies and improve precision in extracting quark–gluon plasma(QGP)transport coefficients(e.g.,shear viscosity),bridging microscopic nuclear features to macroscopic QGP properties. 展开更多
关键词 ultra central collisions hydrodynamic models initial state nuclear structures minimum distance higher order anisotropic flows adjusting shear viscous coefficientas shear viscosity
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