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
Scientific computing has become a cornerstone of modern scientific discovery and engineering innovation.With the rapid advancement of computational power and numerical algorithms,problems that were once analytically i...Scientific computing has become a cornerstone of modern scientific discovery and engineering innovation.With the rapid advancement of computational power and numerical algorithms,problems that were once analytically intractable can now be studied through accurate simulations and large-scale numerical experiments.Scientific computing provides a bridge between mathematical theory,computational algorithms,and real-world engineering applications,enabling researchers to model complex phenomena such as fluid flow,structural deformation,wave propagation,stochastic processes,and nonlinear dynamical systems.The special issue entitled“Scientific Computing and Its Application to Engineering Problems”was conceived to bring together high-quality research contributions that demonstrate the role of computational mathematics in solving challenging engineering problems.The issue highlights both theoretical advances in numerical methods and their practical deployment in real-world engineering scenarios,with emphasis on robustness,computational efficiency,stability,and scalability.展开更多
White Cyphochilus insulanus beetles,exhibiting both environmental camouflage display and radiative cooling functions,serve as a good prototype for biomimetic fabrication.As inspired,this work presents a femtosecond(fs...White Cyphochilus insulanus beetles,exhibiting both environmental camouflage display and radiative cooling functions,serve as a good prototype for biomimetic fabrication.As inspired,this work presents a femtosecond(fs)laser-based biomimetic fabrication strategy that takes full use of the synthesized radiative cooling nanomaterials for a groundbreaking stimuli-responsive infrared(IR)impressionistic camouflage display.The proposed technique is capable of readily transforming various substrates(quartz glass and metals including Ti,Al,Zr,and W)into self-assembled porous networks(aerogels)consisting of oxygen-vacancy-rich oxide nanoparticles.Surprisingly,the emissions of all as-prepared porous particle-networks in the radiative-cooling long-wavelength infrared(LWIR)band are above 95%,with the SiO2 aerogels reaching a maximum of 99.6%.Benefiting from the far-from-equilibrium thermodynamic kinetics,metastable phases of anatase TiO2,tetragonal zirconia(t-ZrO2),and monoclinic WO3(Pc)are synthesizable,opening up opportunities for exploring their optical applications.Taking the low-temperature metastable phase WO3(Pc)as representative for systematic studies,it is found that(1)the ratio WO3(Pc)phase to that of room-temperature phase of WO3(P21)can be tailored by modulation of processing parameters;(2)laser synthesized aerogels with hybrid phases of WO3(Pc)and WO3(P21)have a brighter visible whiteness,higher visibleearinfrared(NIR)spectral selectivity than the natural prototype of white Cyphochilus insulanus beetles but with comparable LWIR emittance.White WO3 aerogel in situ deposited during flexibly fs laser artistic patterning can blur the painting features due to its radiative cooling effect,allowing a colorful impressionistic IR display in the heating mode.What's more,invisible painting features concealed by the white deposited WO3 aerogel are clearly/faintly distinguishable by introducing external stimuli of a human hand and sample heating,respectively,catalyzing progress in optical encryption and selectively stimuli-responsive decryption display in the infrared band.展开更多
This study examines the mediating role of positive psychological capital and the moderating role of ethnicity in the relationship between mindfulness and internalizing/externalizing problems among adolescents.The stud...This study examines the mediating role of positive psychological capital and the moderating role of ethnicity in the relationship between mindfulness and internalizing/externalizing problems among adolescents.The study sample comprized Chinese adolescents(N=637 ethnic minority;females=40.97%,meam age=12.68,SD=0.49 years;N=636 Han;females=49.06%,mean age=12.71,SD=0.47 years).The participants completed the Child and Adolescent Mindfulness Measure,the Positive Psycap Questionnaire,and the Youth Self-Report.Results from the moderated mediation analysis showed mindfulness was negatively associated with both internalizing and externalizing problems.Ethnicity moderated the relationship between mindfulness and internalizing problems to be stronger for Han adolescents compared to ethnic minority adolescents.Psychological capital mediated the relationship between mindfulness and internalizing problems in both groups,with a negative direction.Findings support the Conservation of Resources theory and highlight mindfulness as a personal resource fostering adolescent well-being in multicultural contexts.展开更多
In this study,the shell structure of olives in nature was modeled,and a high-porosity bionic olive body-centered cubic structure(BCCO)with reinforcement structures of circular support(BCCR)and triangular support(BCCT)...In this study,the shell structure of olives in nature was modeled,and a high-porosity bionic olive body-centered cubic structure(BCCO)with reinforcement structures of circular support(BCCR)and triangular support(BCCT)with excellent mechanical properties was designed and prepared using selective laser melting technology.The surface morphology,deformation behavior,and energy absorption of BCCO were compared with those of the equivalent uniform body-centered cubic structure(BCC)and analyzed through quasi-static compression experiments and finite element analysis.The olive-shaped structure showed optimal load resistance when the radius of curvature was equal to the edge length of the lattice structure,and outperformed with a larger curvature than with a smaller curvature.With the added support structure,the energy absorption of the BCCR increased by 144.44%compared with that of the conventional BCC structure.The newly designed olive bionic structure has considerable potential for applications in various fields,such as aerospace and medical devices.展开更多
To solve the problem of abnormal abrasion of Cu-Based Friction Materials(CBFMs),Bionic Non-Smooth Surface(BNS)on friction surface of CBFMs was constructed based on bionic principles,and the optimal bionic prototype wa...To solve the problem of abnormal abrasion of Cu-Based Friction Materials(CBFMs),Bionic Non-Smooth Surface(BNS)on friction surface of CBFMs was constructed based on bionic principles,and the optimal bionic prototype was selected by Finite Element Method(FEM).In addition,the bionic parameters were optimized by Response Surface Method(RSM).Samples holding BNS were prepared by Laser Processing,tribological properties were tested by a Friction and Wear Tester and worn surface morphology was characterized by a Scanning Electron Microscope(SEM).The results showed that BNS on friction surface could regulate the stress distribution and alleviate the peak stress.Among all samples,the coupled texture of pit-hexagonal got the minimum peak stress.During braking,bionic texture could also collect wear debris or change the motion forms from sliding to rotation,which can reduce abnormal abrasion.The wear rate was reduced by 19.31%.The results in this paper can provide a new idea for enhancing the tribological properties of CBFMs,and can also lay the foundation for further research of bionic tribology.展开更多
The bubbles formed on the electrodes tend to stick to the reaction area during hydrogen(H2)production,hindering the continuous reaction,which drastically reduces the H2 production efficiency.In this work,a customizabl...The bubbles formed on the electrodes tend to stick to the reaction area during hydrogen(H2)production,hindering the continuous reaction,which drastically reduces the H2 production efficiency.In this work,a customizable multifunctional three-dimensional(3D)electrode with bionic structures is proposed and precisely fabricated by the projection microstereolithography(PμSL)3D printing technique,which facilitates the catalytic reaction and the detachment of H2 bubbles with an asymmetrically wetted bioinspired functional membrane to allow bubbles to pass through based on Janus effects.The 3D bionic functional electrodes exhibit excellent H2 production performance.At the same voltage,the current density of our 3D electrode is 2.5 times greater than that of a two-dimensional(2D)electrode and 8 times greater than that of a one-dimensional(1D)common flat electrode with the same surface area.Moreover,the amount of H2 collected from a 3D bionic functional electrode is 53.9%and 172.1%greater than that collected from 2D and 1D electrodes with the same catalyst size,respectively.Significantly,a 400 cm2 panel reactor system based on biomimetic 3D functional electrodes enables one-week continuous operation with ultra-high safety and durability in H2 production.Coupled with a solar panel,it achieves long-term outdoor H2 production and gas collection.展开更多
Treating bone defects complicated by bacterial infections remains a significant clinical challenge.Drawing inspiration from the human body's bone repair mechanisms,the use of biomimetic methods to design tissue en...Treating bone defects complicated by bacterial infections remains a significant clinical challenge.Drawing inspiration from the human body's bone repair mechanisms,the use of biomimetic methods to design tissue engineering scaffolds is of great significance for bone repair.This study synthesized copper(Cu)-doped mesoporous silica nanoparticles(Cu@MSN)modified with hydroxyethyl methacrylate to obtain methacrylated Cu@MSN(Cu@MSNMA).Furtheremore,bio-mimetic nanocomposite hydrogels were prepared by adding Cu@MSNMA to a GelMA/gelatin solution.This hydrogel achieves multi-modal bone tissue biomimicry:(ⅰ)GelMA/gelatin mimics the matrix components in bone ECM,ensuring biocompatibility while promoting cellular behavior(such as adhesion,proliferation,and differentiation);(ⅱ)GelMA/gela-tin and the crosslinking sites introduced by Cu@MSNMA form a stable porous network structure,achieving structural and mechanical biomimicry to provide necessary support for bone defects;(ⅲ)The elemental biomimicry of Si and Cu in Cu@MSNMA achieves efficient osteogenic induction.The effect of different proportions of Cu@MSNMA on the physi-cal properties of the composite hydrogels was investigated to determine the optimal proportion.The results indicated that the mechanical properties of hydrogel were enhanced with the increasing Cu@MSNMA mass ratio.Notably,5%NPs/GelMA/gelatin hydrogel exhibited excellent mechanical property compared to the GelMA/gelatin hydrogel.In vitro and vivo cellular experiments demonstrated a significant enhancement in antibacterial and osteogenic induction with Cu@MSNMA addition.In conclusion,the proposed nanocomposite hydrogel with biomimetic components and ion-regulating properties can serve as a multifunctional scaffold,offering antimicrobial properties for infected bone regeneration,and guide for future research in bone regeneration and three-dimensional printing.展开更多
The main cable is the primary load-bearing component of a suspension bridge,continuously exposed to harsh environmental conditions,such as wind and rain,throughout the year.These adverse conditions contribute to varyi...The main cable is the primary load-bearing component of a suspension bridge,continuously exposed to harsh environmental conditions,such as wind and rain,throughout the year.These adverse conditions contribute to varying degrees of degradation and damage to the main cable,necessitating regular inspections to prevent catastrophic failures.Traditional manual inspection methods not only suffer from low efficiency but also pose significant safety risks to personnel.To address these challenges and ensure the safe and effective inspection of suspension bridge main cables,this study introduces a novel cooperative climbing robot,designated as Main Cable Robot Version II(CCRobot-M-II),inspired by the locomotion of the inchworm.The robot employs an alternating opening and closing mechanism of four gripper sets,mimicking the inchworm's movement to achieve efficient crawling along the suspension bridge handrails.This paper provides a comprehensive analysis of the structural design,key components,and motion mechanisms of CCRobot-M-II.A detailed force analysis of the robot's crawling process is also presented,followed by the design of the control system and the development of an efficient motion control algorithm.Laboratory experiments demonstrate that the robot achieves a positional error of 00.64%during crawling,with a maximum average crawling speed of 7.6 m/min.Furthermore,the biomimetic design enables the robot to overcome obstacles up to 30 mm in height and possess the capability to handle suspension bridge cables with spans ranging from 740 to 1100 mm.Finally,CCRobot-M-II successfully conducted an inspection of the main cable on a suspension bridge,marking the world's first successful deployment of a climbing robot for main cable inspection on a suspension bridge.展开更多
The global incidence of pediatric obesity has increased rapidly over the past few decades.Scientific evidence has repeatedly shown that behavioral and emotional challenges are frequently observed in children with over...The global incidence of pediatric obesity has increased rapidly over the past few decades.Scientific evidence has repeatedly shown that behavioral and emotional challenges are frequently observed in children with overweight or obesity[1-2],as evidenced by a landmark case-control design study revealing that obese children have 7.15 times higher odds of developing mental health disorders in adolescence than their normal-weight peers[1].展开更多
Owing to their global search capabilities and gradient-free operation,metaheuristic algorithms are widely applied to a wide range of optimization problems.However,their computational demands become prohibitive when ta...Owing to their global search capabilities and gradient-free operation,metaheuristic algorithms are widely applied to a wide range of optimization problems.However,their computational demands become prohibitive when tackling high-dimensional optimization challenges.To effectively address these challenges,this study introduces cooperative metaheuristics integrating dynamic dimension reduction(DR).Building upon particle swarm optimization(PSO)and differential evolution(DE),the proposed cooperative methods C-PSO and C-DE are developed.In the proposed methods,the modified principal components analysis(PCA)is utilized to reduce the dimension of design variables,thereby decreasing computational costs.The dynamic DR strategy implements periodic execution of modified PCA after a fixed number of iterations,resulting in the important dimensions being dynamically identified.Compared with the static one,the dynamic DR strategy can achieve precise identification of important dimensions,thereby enabling accelerated convergence toward optimal solutions.Furthermore,the influence of cumulative contribution rate thresholds on optimization problems with different dimensions is investigated.Metaheuristic algorithms(PSO,DE)and cooperative metaheuristics(C-PSO,C-DE)are examined by 15 benchmark functions and two engineering design problems(speed reducer and composite pressure vessel).Comparative results demonstrate that the cooperative methods achieve significantly superior performance compared to standard methods in both solution accuracy and computational efficiency.Compared to standard metaheuristic algorithms,cooperative metaheuristics achieve a reduction in computational cost of at least 40%.The cooperative metaheuristics can be effectively used to tackle both high-dimensional unconstrained and constrained optimization problems.展开更多
Recently,the zeroing neural network(ZNN)has demonstrated remarkable effectiveness in tackling time-varying problems,delivering robust performance across both noise-free and noisy environments.However,existing ZNN mode...Recently,the zeroing neural network(ZNN)has demonstrated remarkable effectiveness in tackling time-varying problems,delivering robust performance across both noise-free and noisy environments.However,existing ZNN models are limited in their ability to actively suppress noise,which constrains their robustness and precision in solving time-varying problems.This paper introduces a novel active noise rejection ZNN(ANR-ZNN)design that enhances noise suppression by integrating computational error dynamics and harmonic behaviour.Through rigorous theoretical analysis,we demonstrate that the proposed ANR-ZNN maintains robust convergence in computational error performance under environmental noise.As a case study,the ANR-ZNN model is specifically applied to time-varying matrix inversion.Comprehensive computer simulations and robotic experiments further validate the ANR-ZNN's effectiveness,emphasising the proposed design's superiority and potential for solving time-varying problems.展开更多
Backgrounds:Somatization and eating-related problems in adolescents living in residential care may be shaped by the interplay of risk and protective factors,including gender,relational trauma,attachment patterns,emoti...Backgrounds:Somatization and eating-related problems in adolescents living in residential care may be shaped by the interplay of risk and protective factors,including gender,relational trauma,attachment patterns,emotional intelligence,and perceived social support.This study examined how gender,relational trauma,attachment dimensions,resilience,and emotional intelligence contribute to the presence of somatic and eating difficulties in this population.Methods:The sample included 46 adolescents(63%female;ages 12–17,Mean=14.85,Standard Deviation(SD)=1.49)residing in child protection institutions in Uruguay.Participants completed self-report measures assessing childhood relational trauma(CaMir),attachment dimensions(anxiety and avoidance),resilience,emotional intelligence(adaptability and stress management),social support(MOS),and psychosocial adjustment(SENA subscales of somatization and eating problems).Using a fuzzy-set Qualitative Comparative Analysis(fsQCA)approach,distinct configurations of risk and protective factors associated with elevated levels of somatization and eating problems were identified.Results:Relational trauma and attachment anxiety showed moderate associations with both somatization and eating problems(r=0.52–0.57,p<0.01),whereas stress management was negatively associated with both outcomes(r=−0.37 to−0.47,p<0.05).FsQCA revealed multiple configurations of risk and protective factors explaining 81–90%of cases,with solution consistencies ranging from 0.83 to 0.87.Results suggest that relational trauma and attachment anxiety are key risk conditions,whereas resilience,emotional regulation,and perceived social support function as protective factors.Conclusions:Findings highlight the importance of considering multifactorial patterns of vulnerability and protection rather than single predictors and underscore the need for tailored interventions that strengthen resilience and emotional skills while addressing the impact of early relational trauma.展开更多
THE power industrial control system(power ICS)is thecore infrastructure that ensures the safe,stable,and efficient operation of power systems.Its architecture typi-cally adopts a hierarchical and partitioned end-edge-...THE power industrial control system(power ICS)is thecore infrastructure that ensures the safe,stable,and efficient operation of power systems.Its architecture typi-cally adopts a hierarchical and partitioned end-edge-cloud collaborative design.However,the large-scale integration ofdistributed renewable energy resources,coupled with the extensivedeployment of sensing and communication devices,has resulted inthe new-type power system characterized by dynamic complexityand high uncertainty[1]-[4].展开更多
The fouling problem has attracted much attention in many industrial fields and daily life scenes.Traditional antifouling methods have limitations such as environmental pollution,health hazards,and poor durability.Biom...The fouling problem has attracted much attention in many industrial fields and daily life scenes.Traditional antifouling methods have limitations such as environmental pollution,health hazards,and poor durability.Biomimetic surface micro-textured superhydrophobic surface antifouling technology came into being.This technology does not depend on harmful chemicals,but provides innovative solutions for antifouling,self-cleaning and other fields by imitating the special micro-nano structure of biological surface and utilizing its own physical characteristics.Micro-textures inspired by plants and animals,such as lotus leaves,rose petals,shark skin,etc.,can change the wettability of the material surface and reduce the adhesion of dirt.Processing technologies such as laser,wire cutting and template method can be used to construct micro-textures with superhydrophobic properties.These technologies have the advantages of simple process,high processing efficiency and environmental friendliness.Numerous research cases have shown that bionic micro-texture technology has great application potential and value in many fields.In the future,with the continuous advancement and innovation of micro-nano processing technology and the strengthening of interdisciplinary cooperation,bionic microtexture technology is expected to achieve breakthroughs in more fields and provide more innovative ideas and solutions for solving the fouling problem.展开更多
Bionic circuits can reproduce the firing activities of excitable biological neurons,which are the potential hardware foundation for artificial intelligent applications.This paper builds a meminductive and memristive e...Bionic circuits can reproduce the firing activities of excitable biological neurons,which are the potential hardware foundation for artificial intelligent applications.This paper builds a meminductive and memristive emulator-based bionic circuit by referring to the electrophysiological microstructure of the lipid bilayer membrane of a biological neuron,within which an S-type memristor and a flux-controlled meminductor are employed to characterize the ion channels and their internal electromagnetic induction,respectively.The schematic of the bionic circuit only involves a capacitor,a memristor,a meminductor,and an external direct current(DC)source.Numerical simulations demonstrate that the bionic circuit can generate abundant chaotic and periodic spiking activities for the external stimulus,memristor-,and meminductor-related parameters.Moreover,a printed circuit board(PCB)-based hardware circuit is manually fabricated,upon which experimental measurements are performed to verify the chaotic and periodic spiking activities.This exploration demonstrates the feasibility of the bionic circuit in generating spiking activities and provides a hardware foundation for spike-based applications.展开更多
Energy Storage and Return(ESR)prosthetic feet are commonly used by individuals with tibial amputations,but their fixed stiffness cannot accommodate varying walking tasks and user preferences.In contrast,semi-active pr...Energy Storage and Return(ESR)prosthetic feet are commonly used by individuals with tibial amputations,but their fixed stiffness cannot accommodate varying walking tasks and user preferences.In contrast,semi-active prostheses can adjust stiffness through control mechanisms,though their design still leaves room for improvement in biomimetic characteristics,mass,and dynamic response.In this paper,we present a bionic,variable-stiffness,semi-active ankle-foot prosthesis.Stiffness is adjusted before each ground contact by controlling the motor to alter the length of the moment arm from the ankle joint center to the point of force application,with a range of 1.78-7.01 N·m/°.Additionally,the device features a biomimetic footplate design based on the transverse arch of the human foot,which reduces weight(total weight:933 g)while guaranteeing support capacity.The prosthesis can precisely identify the phase for stiffness adjustment and achieve the widest range of adjustment during this phase.A unilateral tibial amputee participated in a preliminary clinical test involving variable-speed walking,stairs,and ramps.Preliminary single-subject data suggest that,compared to the subject's previous fixed-stiffness prosthesis,the newly designed prosthesis increases the range of motion,peak power,and energy storage during level walking,while reducing the adduction moment on the sound limb's knee joint.These findings offer initial support for the prosthesis'potential to improve the biomechanics of walking and other activities,providing insights for the development of biomimetic design.展开更多
Achieving high drive efficiency remains a significant challenge in active knee prosthesis design. Inspired by human knee biomechanics, this study presents a novel biomimetic hydraulic drive system integrated with thre...Achieving high drive efficiency remains a significant challenge in active knee prosthesis design. Inspired by human knee biomechanics, this study presents a novel biomimetic hydraulic drive system integrated with three human-like mechanisms: antagonistic muscle driving mechanism, dynamic simulation of muscle forces, and multi-stage collaborative energy supply. The system features a multi-stage hydraulic-rope hybrid transmission enabling adjustable damping and compliant motion control, coupled with a dual-cylinder configuration that boosts driving efficiency while delivering 29.7 Nm peak torque. A pump-valve hybrid control strategy is developed to dynamically adjust the flow and driving torque across gait phases, enhancing response speed and angular tracking accuracy. Through computational modeling, simulation, and prototype validation, we demonstrate that the proposed hydraulic drive system achieves efficient and responsive knee flexion and extension while meeting functional demands, reducing energy consumption by 20–50% compared to traditional pump-controlled systems. This study introduces a novel strategy for developing multimodal muscle-joint collaborative mechanisms, establishing a foundational framework for next-generation, high-performance bioinspired prostheses.展开更多
Background:Parental overparenting is highly prevalent in current Chinese families,and its psychological influences on adolescent mental health are of great academic and practical concern.However,limited research has e...Background:Parental overparenting is highly prevalent in current Chinese families,and its psychological influences on adolescent mental health are of great academic and practical concern.However,limited research has examined the potential curvilinear relationship between different dimensions of parental overparenting and adolescent internalizing problems,as well as the moderating roles of adolescent gender and age in these relationships.The purpose of this study was to examine the unique and potentially curvilinear effects of different dimensions of parental overparenting on adolescent internalizing problems in the context of contemporary Chinese families.Methods:Data were collected from 285 adolescents(147 male,Meanage=11.93)and their families across five cities in China at an initial assessment(Wave 1)and at a follow-up one year later(Wave 2).Hierarchical regression analyses were performed with SPSS 25.0 to examine the associations among the main variables.Results:The findings indicated that different dimensions of parental overparenting were differentially associated with adolescents’internalizing problems.Specifically,frequent comparisons of children’s achievements with peers positively and linearly predicted adolescents’internalizing problems at Wave 2(β=0.27,p<0.05).In addition,excessive affective involvement showed a U-shaped association with boys’internalizing problems(b=0.21,p<0.01),whereas excessive care exhibited a U-shaped association with adolescents’internalizing problems at Wave 2(b=0.19,p<0.05).Conclusions:These results suggest that different dimensions of overparenting impact adolescent development in various ways,highlighting the need for providing appropriate support and guidance without excessive control in family parenting practices.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.12301305).
摘要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.
摘要Scientific computing has become a cornerstone of modern scientific discovery and engineering innovation.With the rapid advancement of computational power and numerical algorithms,problems that were once analytically intractable can now be studied through accurate simulations and large-scale numerical experiments.Scientific computing provides a bridge between mathematical theory,computational algorithms,and real-world engineering applications,enabling researchers to model complex phenomena such as fluid flow,structural deformation,wave propagation,stochastic processes,and nonlinear dynamical systems.The special issue entitled“Scientific Computing and Its Application to Engineering Problems”was conceived to bring together high-quality research contributions that demonstrate the role of computational mathematics in solving challenging engineering problems.The issue highlights both theoretical advances in numerical methods and their practical deployment in real-world engineering scenarios,with emphasis on robustness,computational efficiency,stability,and scalability.
基金financial support received from the Shanghai Pujiang Program(23PJ1406500)。
摘要White Cyphochilus insulanus beetles,exhibiting both environmental camouflage display and radiative cooling functions,serve as a good prototype for biomimetic fabrication.As inspired,this work presents a femtosecond(fs)laser-based biomimetic fabrication strategy that takes full use of the synthesized radiative cooling nanomaterials for a groundbreaking stimuli-responsive infrared(IR)impressionistic camouflage display.The proposed technique is capable of readily transforming various substrates(quartz glass and metals including Ti,Al,Zr,and W)into self-assembled porous networks(aerogels)consisting of oxygen-vacancy-rich oxide nanoparticles.Surprisingly,the emissions of all as-prepared porous particle-networks in the radiative-cooling long-wavelength infrared(LWIR)band are above 95%,with the SiO2 aerogels reaching a maximum of 99.6%.Benefiting from the far-from-equilibrium thermodynamic kinetics,metastable phases of anatase TiO2,tetragonal zirconia(t-ZrO2),and monoclinic WO3(Pc)are synthesizable,opening up opportunities for exploring their optical applications.Taking the low-temperature metastable phase WO3(Pc)as representative for systematic studies,it is found that(1)the ratio WO3(Pc)phase to that of room-temperature phase of WO3(P21)can be tailored by modulation of processing parameters;(2)laser synthesized aerogels with hybrid phases of WO3(Pc)and WO3(P21)have a brighter visible whiteness,higher visibleearinfrared(NIR)spectral selectivity than the natural prototype of white Cyphochilus insulanus beetles but with comparable LWIR emittance.White WO3 aerogel in situ deposited during flexibly fs laser artistic patterning can blur the painting features due to its radiative cooling effect,allowing a colorful impressionistic IR display in the heating mode.What's more,invisible painting features concealed by the white deposited WO3 aerogel are clearly/faintly distinguishable by introducing external stimuli of a human hand and sample heating,respectively,catalyzing progress in optical encryption and selectively stimuli-responsive decryption display in the infrared band.
基金supported by the Guizhou Provincial Science and Technology Projects[Basic Science of Guizhou-[2024]Youth 309,Guizhou Platform Talents[2021]1350-046]Zunyi Science and Technology Cooperation[HZ(2024)311]+3 种基金Funding of the Chinese Academy of Social Sciences(2024SYZH005)Peking University Longitudinal Scientific Research Technical Service Project(G-252)Guizhou Provincial Graduate Student Research Fund Project(2024YJSKYJJ339)Zunyi Medical University Graduate Research Fund Project(ZYK206).
摘要This study examines the mediating role of positive psychological capital and the moderating role of ethnicity in the relationship between mindfulness and internalizing/externalizing problems among adolescents.The study sample comprized Chinese adolescents(N=637 ethnic minority;females=40.97%,meam age=12.68,SD=0.49 years;N=636 Han;females=49.06%,mean age=12.71,SD=0.47 years).The participants completed the Child and Adolescent Mindfulness Measure,the Positive Psycap Questionnaire,and the Youth Self-Report.Results from the moderated mediation analysis showed mindfulness was negatively associated with both internalizing and externalizing problems.Ethnicity moderated the relationship between mindfulness and internalizing problems to be stronger for Han adolescents compared to ethnic minority adolescents.Psychological capital mediated the relationship between mindfulness and internalizing problems in both groups,with a negative direction.Findings support the Conservation of Resources theory and highlight mindfulness as a personal resource fostering adolescent well-being in multicultural contexts.
基金Supported by Key Technologies Research and Development Program of China(Grant No.2022YFC2406004).
摘要In this study,the shell structure of olives in nature was modeled,and a high-porosity bionic olive body-centered cubic structure(BCCO)with reinforcement structures of circular support(BCCR)and triangular support(BCCT)with excellent mechanical properties was designed and prepared using selective laser melting technology.The surface morphology,deformation behavior,and energy absorption of BCCO were compared with those of the equivalent uniform body-centered cubic structure(BCC)and analyzed through quasi-static compression experiments and finite element analysis.The olive-shaped structure showed optimal load resistance when the radius of curvature was equal to the edge length of the lattice structure,and outperformed with a larger curvature than with a smaller curvature.With the added support structure,the energy absorption of the BCCR increased by 144.44%compared with that of the conventional BCC structure.The newly designed olive bionic structure has considerable potential for applications in various fields,such as aerospace and medical devices.
基金Wuxi University Research Start-up Fund for Introduced Talents(Grant No:2024r031)Technology Development Contract(Contract Registration Number:2024320205000963)+1 种基金National Natural Science Foundation of China(Grant No.52275288)Ningbo Key Research and Development Plan(Grant No.2023Z022).
摘要To solve the problem of abnormal abrasion of Cu-Based Friction Materials(CBFMs),Bionic Non-Smooth Surface(BNS)on friction surface of CBFMs was constructed based on bionic principles,and the optimal bionic prototype was selected by Finite Element Method(FEM).In addition,the bionic parameters were optimized by Response Surface Method(RSM).Samples holding BNS were prepared by Laser Processing,tribological properties were tested by a Friction and Wear Tester and worn surface morphology was characterized by a Scanning Electron Microscope(SEM).The results showed that BNS on friction surface could regulate the stress distribution and alleviate the peak stress.Among all samples,the coupled texture of pit-hexagonal got the minimum peak stress.During braking,bionic texture could also collect wear debris or change the motion forms from sliding to rotation,which can reduce abnormal abrasion.The wear rate was reduced by 19.31%.The results in this paper can provide a new idea for enhancing the tribological properties of CBFMs,and can also lay the foundation for further research of bionic tribology.
基金supported by the National Natural Science Foundation of China through(Grant Nos.52576071,52495000,and 52495001).
摘要The bubbles formed on the electrodes tend to stick to the reaction area during hydrogen(H2)production,hindering the continuous reaction,which drastically reduces the H2 production efficiency.In this work,a customizable multifunctional three-dimensional(3D)electrode with bionic structures is proposed and precisely fabricated by the projection microstereolithography(PμSL)3D printing technique,which facilitates the catalytic reaction and the detachment of H2 bubbles with an asymmetrically wetted bioinspired functional membrane to allow bubbles to pass through based on Janus effects.The 3D bionic functional electrodes exhibit excellent H2 production performance.At the same voltage,the current density of our 3D electrode is 2.5 times greater than that of a two-dimensional(2D)electrode and 8 times greater than that of a one-dimensional(1D)common flat electrode with the same surface area.Moreover,the amount of H2 collected from a 3D bionic functional electrode is 53.9%and 172.1%greater than that collected from 2D and 1D electrodes with the same catalyst size,respectively.Significantly,a 400 cm2 panel reactor system based on biomimetic 3D functional electrodes enables one-week continuous operation with ultra-high safety and durability in H2 production.Coupled with a solar panel,it achieves long-term outdoor H2 production and gas collection.
基金National Key R&D Program of China(grant number 2022YFA1207500)National Natural Science Foundation of China(grant number 82072412).
摘要Treating bone defects complicated by bacterial infections remains a significant clinical challenge.Drawing inspiration from the human body's bone repair mechanisms,the use of biomimetic methods to design tissue engineering scaffolds is of great significance for bone repair.This study synthesized copper(Cu)-doped mesoporous silica nanoparticles(Cu@MSN)modified with hydroxyethyl methacrylate to obtain methacrylated Cu@MSN(Cu@MSNMA).Furtheremore,bio-mimetic nanocomposite hydrogels were prepared by adding Cu@MSNMA to a GelMA/gelatin solution.This hydrogel achieves multi-modal bone tissue biomimicry:(ⅰ)GelMA/gelatin mimics the matrix components in bone ECM,ensuring biocompatibility while promoting cellular behavior(such as adhesion,proliferation,and differentiation);(ⅱ)GelMA/gela-tin and the crosslinking sites introduced by Cu@MSNMA form a stable porous network structure,achieving structural and mechanical biomimicry to provide necessary support for bone defects;(ⅲ)The elemental biomimicry of Si and Cu in Cu@MSNMA achieves efficient osteogenic induction.The effect of different proportions of Cu@MSNMA on the physi-cal properties of the composite hydrogels was investigated to determine the optimal proportion.The results indicated that the mechanical properties of hydrogel were enhanced with the increasing Cu@MSNMA mass ratio.Notably,5%NPs/GelMA/gelatin hydrogel exhibited excellent mechanical property compared to the GelMA/gelatin hydrogel.In vitro and vivo cellular experiments demonstrated a significant enhancement in antibacterial and osteogenic induction with Cu@MSNMA addition.In conclusion,the proposed nanocomposite hydrogel with biomimetic components and ion-regulating properties can serve as a multifunctional scaffold,offering antimicrobial properties for infected bone regeneration,and guide for future research in bone regeneration and three-dimensional printing.
基金Shenzhen Science and Technology Program(Grant No.20220817171811004)(Grant No.RCBS20231211090816033)+4 种基金the Major Key Project of PCL,China under Grant PCL2025A13Longgang District,Shenzhen's"Ten-Action Plan"for Supporting Innovation Projects(Grant No.LGKCSDPT2024002,LGKCSDPT2024003,LGKCSDPT2024004)the"Zhiguo"Action of Guangxi Science and Technology Program(Grant No.ZG2503980003)Guangdong S&T Program under(Grant No.2025B0909040003)Guangdong Provincial Leading Talent Program(Grant No.2024TX08Z319).
摘要The main cable is the primary load-bearing component of a suspension bridge,continuously exposed to harsh environmental conditions,such as wind and rain,throughout the year.These adverse conditions contribute to varying degrees of degradation and damage to the main cable,necessitating regular inspections to prevent catastrophic failures.Traditional manual inspection methods not only suffer from low efficiency but also pose significant safety risks to personnel.To address these challenges and ensure the safe and effective inspection of suspension bridge main cables,this study introduces a novel cooperative climbing robot,designated as Main Cable Robot Version II(CCRobot-M-II),inspired by the locomotion of the inchworm.The robot employs an alternating opening and closing mechanism of four gripper sets,mimicking the inchworm's movement to achieve efficient crawling along the suspension bridge handrails.This paper provides a comprehensive analysis of the structural design,key components,and motion mechanisms of CCRobot-M-II.A detailed force analysis of the robot's crawling process is also presented,followed by the design of the control system and the development of an efficient motion control algorithm.Laboratory experiments demonstrate that the robot achieves a positional error of 00.64%during crawling,with a maximum average crawling speed of 7.6 m/min.Furthermore,the biomimetic design enables the robot to overcome obstacles up to 30 mm in height and possess the capability to handle suspension bridge cables with spans ranging from 740 to 1100 mm.Finally,CCRobot-M-II successfully conducted an inspection of the main cable on a suspension bridge,marking the world's first successful deployment of a climbing robot for main cable inspection on a suspension bridge.
基金Natural Science Foundation of Beijing Municipality under Grant No.7232057。
摘要The global incidence of pediatric obesity has increased rapidly over the past few decades.Scientific evidence has repeatedly shown that behavioral and emotional challenges are frequently observed in children with overweight or obesity[1-2],as evidenced by a landmark case-control design study revealing that obese children have 7.15 times higher odds of developing mental health disorders in adolescence than their normal-weight peers[1].
基金funded by National Natural Science Foundation of China(Nos.12402142,11832013 and 11572134)Natural Science Foundation of Hubei Province(No.2024AFB235)+1 种基金Hubei Provincial Department of Education Science and Technology Research Project(No.Q20221714)the Opening Foundation of Hubei Key Laboratory of Digital Textile Equipment(Nos.DTL2023019 and DTL2022012).
摘要Owing to their global search capabilities and gradient-free operation,metaheuristic algorithms are widely applied to a wide range of optimization problems.However,their computational demands become prohibitive when tackling high-dimensional optimization challenges.To effectively address these challenges,this study introduces cooperative metaheuristics integrating dynamic dimension reduction(DR).Building upon particle swarm optimization(PSO)and differential evolution(DE),the proposed cooperative methods C-PSO and C-DE are developed.In the proposed methods,the modified principal components analysis(PCA)is utilized to reduce the dimension of design variables,thereby decreasing computational costs.The dynamic DR strategy implements periodic execution of modified PCA after a fixed number of iterations,resulting in the important dimensions being dynamically identified.Compared with the static one,the dynamic DR strategy can achieve precise identification of important dimensions,thereby enabling accelerated convergence toward optimal solutions.Furthermore,the influence of cumulative contribution rate thresholds on optimization problems with different dimensions is investigated.Metaheuristic algorithms(PSO,DE)and cooperative metaheuristics(C-PSO,C-DE)are examined by 15 benchmark functions and two engineering design problems(speed reducer and composite pressure vessel).Comparative results demonstrate that the cooperative methods achieve significantly superior performance compared to standard methods in both solution accuracy and computational efficiency.Compared to standard metaheuristic algorithms,cooperative metaheuristics achieve a reduction in computational cost of at least 40%.The cooperative metaheuristics can be effectively used to tackle both high-dimensional unconstrained and constrained optimization problems.
基金supported by the National Science and Technology Major Project(2022ZD0119901)the National Natural Science Foundation of China under Grant(U2141234,62463004 and U24A20260)+1 种基金the Hainan Province Science and Technology Special Fund(ZDYF2024GXJS003)the Scientific Research Fund of Hainan University(KYQD(ZR)23025).
摘要Recently,the zeroing neural network(ZNN)has demonstrated remarkable effectiveness in tackling time-varying problems,delivering robust performance across both noise-free and noisy environments.However,existing ZNN models are limited in their ability to actively suppress noise,which constrains their robustness and precision in solving time-varying problems.This paper introduces a novel active noise rejection ZNN(ANR-ZNN)design that enhances noise suppression by integrating computational error dynamics and harmonic behaviour.Through rigorous theoretical analysis,we demonstrate that the proposed ANR-ZNN maintains robust convergence in computational error performance under environmental noise.As a case study,the ANR-ZNN model is specifically applied to time-varying matrix inversion.Comprehensive computer simulations and robotic experiments further validate the ANR-ZNN's effectiveness,emphasising the proposed design's superiority and potential for solving time-varying problems.
摘要Backgrounds:Somatization and eating-related problems in adolescents living in residential care may be shaped by the interplay of risk and protective factors,including gender,relational trauma,attachment patterns,emotional intelligence,and perceived social support.This study examined how gender,relational trauma,attachment dimensions,resilience,and emotional intelligence contribute to the presence of somatic and eating difficulties in this population.Methods:The sample included 46 adolescents(63%female;ages 12–17,Mean=14.85,Standard Deviation(SD)=1.49)residing in child protection institutions in Uruguay.Participants completed self-report measures assessing childhood relational trauma(CaMir),attachment dimensions(anxiety and avoidance),resilience,emotional intelligence(adaptability and stress management),social support(MOS),and psychosocial adjustment(SENA subscales of somatization and eating problems).Using a fuzzy-set Qualitative Comparative Analysis(fsQCA)approach,distinct configurations of risk and protective factors associated with elevated levels of somatization and eating problems were identified.Results:Relational trauma and attachment anxiety showed moderate associations with both somatization and eating problems(r=0.52–0.57,p<0.01),whereas stress management was negatively associated with both outcomes(r=−0.37 to−0.47,p<0.05).FsQCA revealed multiple configurations of risk and protective factors explaining 81–90%of cases,with solution consistencies ranging from 0.83 to 0.87.Results suggest that relational trauma and attachment anxiety are key risk conditions,whereas resilience,emotional regulation,and perceived social support function as protective factors.Conclusions:Findings highlight the importance of considering multifactorial patterns of vulnerability and protection rather than single predictors and underscore the need for tailored interventions that strengthen resilience and emotional skills while addressing the impact of early relational trauma.
基金partially supported by the National Natural Science Foundation of China(62293500,62293505,62233010,62503240)Natural Science Foundation of Jiangsu Province(BK20250679)。
摘要THE power industrial control system(power ICS)is thecore infrastructure that ensures the safe,stable,and efficient operation of power systems.Its architecture typi-cally adopts a hierarchical and partitioned end-edge-cloud collaborative design.However,the large-scale integration ofdistributed renewable energy resources,coupled with the extensivedeployment of sensing and communication devices,has resulted inthe new-type power system characterized by dynamic complexityand high uncertainty[1]-[4].
基金supported by Natural Science Foundation of Shandong Province(ZR2022ME041)Shandong Provincial Central Leading Local Science and Technology Development Fund Project(YDZX2022003)Innovation Capability Enhancement Project for Technological Small and Medium sized Enterprises(2023TSGC0192)。
摘要The fouling problem has attracted much attention in many industrial fields and daily life scenes.Traditional antifouling methods have limitations such as environmental pollution,health hazards,and poor durability.Biomimetic surface micro-textured superhydrophobic surface antifouling technology came into being.This technology does not depend on harmful chemicals,but provides innovative solutions for antifouling,self-cleaning and other fields by imitating the special micro-nano structure of biological surface and utilizing its own physical characteristics.Micro-textures inspired by plants and animals,such as lotus leaves,rose petals,shark skin,etc.,can change the wettability of the material surface and reduce the adhesion of dirt.Processing technologies such as laser,wire cutting and template method can be used to construct micro-textures with superhydrophobic properties.These technologies have the advantages of simple process,high processing efficiency and environmental friendliness.Numerous research cases have shown that bionic micro-texture technology has great application potential and value in many fields.In the future,with the continuous advancement and innovation of micro-nano processing technology and the strengthening of interdisciplinary cooperation,bionic microtexture technology is expected to achieve breakthroughs in more fields and provide more innovative ideas and solutions for solving the fouling problem.
基金supported by the National Natural Science Foundation of China(Grant Nos.12572066 and 12172066)the 333 Project of Jiangsu Province+1 种基金the Research and Innovation Project of the Compound Semiconductor Innovation Consortium(Grant No.RIPCSIC202502)the College Students’Innovation and Entrepreneurship Training Program of Changzhou University(Grant No.S202510292080)。
摘要Bionic circuits can reproduce the firing activities of excitable biological neurons,which are the potential hardware foundation for artificial intelligent applications.This paper builds a meminductive and memristive emulator-based bionic circuit by referring to the electrophysiological microstructure of the lipid bilayer membrane of a biological neuron,within which an S-type memristor and a flux-controlled meminductor are employed to characterize the ion channels and their internal electromagnetic induction,respectively.The schematic of the bionic circuit only involves a capacitor,a memristor,a meminductor,and an external direct current(DC)source.Numerical simulations demonstrate that the bionic circuit can generate abundant chaotic and periodic spiking activities for the external stimulus,memristor-,and meminductor-related parameters.Moreover,a printed circuit board(PCB)-based hardware circuit is manually fabricated,upon which experimental measurements are performed to verify the chaotic and periodic spiking activities.This exploration demonstrates the feasibility of the bionic circuit in generating spiking activities and provides a hardware foundation for spike-based applications.
基金supported in part by the National Key R&D Program of China under Grant 2018YFC2001300the Science and Technology Research Project of Educational Department of Jilin Province under Grant JJKH20241259KJthe National Natural Science Foundation of China under Grant 52405309。
摘要Energy Storage and Return(ESR)prosthetic feet are commonly used by individuals with tibial amputations,but their fixed stiffness cannot accommodate varying walking tasks and user preferences.In contrast,semi-active prostheses can adjust stiffness through control mechanisms,though their design still leaves room for improvement in biomimetic characteristics,mass,and dynamic response.In this paper,we present a bionic,variable-stiffness,semi-active ankle-foot prosthesis.Stiffness is adjusted before each ground contact by controlling the motor to alter the length of the moment arm from the ankle joint center to the point of force application,with a range of 1.78-7.01 N·m/°.Additionally,the device features a biomimetic footplate design based on the transverse arch of the human foot,which reduces weight(total weight:933 g)while guaranteeing support capacity.The prosthesis can precisely identify the phase for stiffness adjustment and achieve the widest range of adjustment during this phase.A unilateral tibial amputee participated in a preliminary clinical test involving variable-speed walking,stairs,and ramps.Preliminary single-subject data suggest that,compared to the subject's previous fixed-stiffness prosthesis,the newly designed prosthesis increases the range of motion,peak power,and energy storage during level walking,while reducing the adduction moment on the sound limb's knee joint.These findings offer initial support for the prosthesis'potential to improve the biomechanics of walking and other activities,providing insights for the development of biomimetic design.
基金supported by the National Natural Science Foundation of China (NO. 5217053432).
摘要Achieving high drive efficiency remains a significant challenge in active knee prosthesis design. Inspired by human knee biomechanics, this study presents a novel biomimetic hydraulic drive system integrated with three human-like mechanisms: antagonistic muscle driving mechanism, dynamic simulation of muscle forces, and multi-stage collaborative energy supply. The system features a multi-stage hydraulic-rope hybrid transmission enabling adjustable damping and compliant motion control, coupled with a dual-cylinder configuration that boosts driving efficiency while delivering 29.7 Nm peak torque. A pump-valve hybrid control strategy is developed to dynamically adjust the flow and driving torque across gait phases, enhancing response speed and angular tracking accuracy. Through computational modeling, simulation, and prototype validation, we demonstrate that the proposed hydraulic drive system achieves efficient and responsive knee flexion and extension while meeting functional demands, reducing energy consumption by 20–50% compared to traditional pump-controlled systems. This study introduces a novel strategy for developing multimodal muscle-joint collaborative mechanisms, establishing a foundational framework for next-generation, high-performance bioinspired prostheses.
摘要Background:Parental overparenting is highly prevalent in current Chinese families,and its psychological influences on adolescent mental health are of great academic and practical concern.However,limited research has examined the potential curvilinear relationship between different dimensions of parental overparenting and adolescent internalizing problems,as well as the moderating roles of adolescent gender and age in these relationships.The purpose of this study was to examine the unique and potentially curvilinear effects of different dimensions of parental overparenting on adolescent internalizing problems in the context of contemporary Chinese families.Methods:Data were collected from 285 adolescents(147 male,Meanage=11.93)and their families across five cities in China at an initial assessment(Wave 1)and at a follow-up one year later(Wave 2).Hierarchical regression analyses were performed with SPSS 25.0 to examine the associations among the main variables.Results:The findings indicated that different dimensions of parental overparenting were differentially associated with adolescents’internalizing problems.Specifically,frequent comparisons of children’s achievements with peers positively and linearly predicted adolescents’internalizing problems at Wave 2(β=0.27,p<0.05).In addition,excessive affective involvement showed a U-shaped association with boys’internalizing problems(b=0.21,p<0.01),whereas excessive care exhibited a U-shaped association with adolescents’internalizing problems at Wave 2(b=0.19,p<0.05).Conclusions:These results suggest that different dimensions of overparenting impact adolescent development in various ways,highlighting the need for providing appropriate support and guidance without excessive control in family parenting practices.