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Punching in Fiber-Reinforced,Net-Reinforced,and Unreinforced Concrete Slabs under Static,Impulsive,and Thermal Loading 认领 引用
1
作者 Roberto Felicetti Pietro G.Gambarova Francesco Lo Monte 《Structural Durability & Health Monitoring》 EI 2026年第3期95-124,共30页
Many tests have been conducted over the years in Milan on moderately-thick concrete slabs—with diameter-to-thickness ratios of 5 and 5.5—either reinforced or unreinforced,all subjected to punching,with different mix... Many tests have been conducted over the years in Milan on moderately-thick concrete slabs—with diameter-to-thickness ratios of 5 and 5.5—either reinforced or unreinforced,all subjected to punching,with different mixes,reinforcement technologies,and loading procedures.Their results are revisited systematically in this paper,starting from a thorough review of the literature on moderately thick concrete slabs.The specimens were either square(but fastened to a circular support)or circular.In three experimental campaigns,99 specimens were tested:50 under quasi-static loading(including 16 exposed to high temperatures)and 49 under impulsive loading.The first campaign investigated concrete slabs reinforced with polyacrylonitrile fibers,steel fibers,or steel nets,focusing on their deformed shapes and failure modes under quasi-static punching.The second campaign examined the effects of high temperatures on unreinforced and net-reinforced slabs subjected to quasi-static punching,while the third campaign focused on the failure modes and energy issues of fiber-reinforced slabs under impulsive punching.Polyacrylonitrile fibers increase punching resistance under impact,but change the failure mode from mixed(bending+punching)to pure punching.Steel nets increase slab ductility more than steel fibers,while high temperatures promote a shift from bending-controlled to shear-controlled failure modes.The main contributions of the test results are:(a)the varying degree of softening in the slab’s response to punching due to the formation of either small or large punching cones;(b)the reduction in bearing capacity with increasing temperature,which occurs more in net-reinforced than in fiber-reinforced slabs;and(c)the different contributions to the total dissipated energy under impact,resulting from the formation of bending-related cracks and of the punching cone.Overall,this work aims to highlight general trends in slab behavior under punching loads in different conditions,using highly idealized tests(as often done in labs),that provide a basic representation of actual punching scenarios. 展开更多
关键词 Concrete slabs steel nets polymeric/steel fibers static/impulsive punching high temperatures failure modes energy balance(in slab punching)
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THRESHOLD ANALYSIS OF IMPULSIVE CONTROL IN A MOSQUITO POPULATION SUPPRESSION MODEL WITH SPARSE STATE FEEDBACK 认领 引用
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作者 Shouzong LIU Yang XU Mingzhan HUANG 《Acta Mathematica Scientia》 SCIE CSCD 2026年第2期897-919,共23页
In this study,a mosquito population suppression model that integrates stage structure is introduced,which serves as the foundation for exploring various strategies for the periodic impulsive release of sterile mosquit... In this study,a mosquito population suppression model that integrates stage structure is introduced,which serves as the foundation for exploring various strategies for the periodic impulsive release of sterile mosquitoes,including those that either incorporate or disregard population state feedback,as well as a composite control approach.We identify release thresholds under different strategies that ensure the complete eradication of the wild mosquito population.Numerical analyses are conducted to evaluate the performance of these release strategies.Our findings reveal that integrating state feedback mechanisms can effectively prevent the blindness of release behaviors.Key factors such as the release interval,frequency of population assessments,and control intensity significantly influence the reduction of the cumulative release quantity of sterile mosquitoes,the shortening of control duration,and the decrease in effective release events.The influence of these factors on control outcomes across different strategies and scenarios is also examined. 展开更多
关键词 mosquito population suppression model periodic impulsive release sparse state feedback extinction equilibrium
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Event-Triggered Impulsive Control:A Survey 认领 引用
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作者 Xiaodi Li 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2026年第5期1024-1040,共17页
An event-triggered impulsive control(ETIC)approach has attracted considerable attention in both theoretical and practical fields,as it ensures that control resources are deployed solely at moments of strict necessity,... An event-triggered impulsive control(ETIC)approach has attracted considerable attention in both theoretical and practical fields,as it ensures that control resources are deployed solely at moments of strict necessity,thereby significantly reducing the control frequency without compromising system performance.This survey aims to provide a timely,structured,and in-depth overview of recent advances in ETIC.First,a brief introduction of impulsive control and ETIC is given,analysing the advantages of ETIC over the traditional time-triggered impulsive control.Second,the representative results and methodologies reported in ETIC are generally classified from the perspective of structural characteristics of event-triggering mechanisms(ETMs),and the fundamental principles underlying each type of ETM are elaborated in detail.Third,the common methods used to exclude the Zeno behavior in recent ETIC results are presented in detail.Then,an in-depth analysis is made on several categories of theoretical results on the stability problem based on ETIC.Fourth,applications of ETIC in practical scenarios,including motor servo systems,chemical reactor systems,and wheeled robots,are provided.Finally,some challenging issues on ETIC are proposed to guide future research. 展开更多
关键词 Event-triggered impulsive control(ETIC) eventtriggered mechanism(ETM) impulsive system Lyapunov stability self-triggered mechanism(STM) Zeno behavior
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Leader-Follower Formation Control of Quadrotor UAVs With Stochastic Impulsive Deception Attacks 认领 引用
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作者 Wenhao Song Chang Liu +1 位作者 Xiuping Han Xiaodi Li 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2026年第2期483-485,共3页
Dear Editor,This letter presents some control strategies for quadrotor unmanned aerial vehicle(UAV)leader-follower formation model,where the stochastic impulsive deception attacks are fully considered.Based on Lyapuno... Dear Editor,This letter presents some control strategies for quadrotor unmanned aerial vehicle(UAV)leader-follower formation model,where the stochastic impulsive deception attacks are fully considered.Based on Lyapunov method,the outer loop and the inner loop controllers of quadrotor UAV are designed,respectively.Moreover,a relationship between continuous control laws,stochastic impulsive sequences,and impulsive intensity is established in this letter. 展开更多
关键词 quadrotor uav quadrotor unmanned aerial vehicle uav leader follower stochastic impulsive deception attacks continuous control lawsstochastic impulsive sequencesand leader follower formation lyapunov methodthe outer loop control strategies
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Gain-Based Neural Secure Protection Control for Feedforward Nonlinear Systems With Unknown Control Coefficients and Impulsive FDI Attacks 认领 引用
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作者 Debao Fan Qingrong Liu +2 位作者 Rong Su Xianfu Zhang Wenjie Zhang 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2026年第5期1068-1081,共14页
This paper proposes a gain-based neural secure protection(GBNSP)control scheme for feedforward nonlinear systems subject to unknown control coefficients and impulsive false data injection(FDI)attacks.Notably,the nonli... This paper proposes a gain-based neural secure protection(GBNSP)control scheme for feedforward nonlinear systems subject to unknown control coefficients and impulsive false data injection(FDI)attacks.Notably,the nonlinear functions of the systems are relaxed to any continuous functions and the control coefficients are permitted to be constants with both unknown sizes and signs,a scenario not covered in existing works.Furthermore,the uncertain abrupt changes in system states caused by impulsive FDI attacks inevitably exacerbate the challenges in control design.To this end,this paper integrates the neural network technique and the gain control method to propose a novel GBNSP control scheme.Specifically,the neural network technique effectively compensates for strong nonlinearities and uncertainties,while the gain control method quantifies the tolerable frequency of impulsive FDI attacks and avoids the tedious design procedures.It is shown that,under the designed GBNSP controller,all closed-loop signals remain bounded and the system states eventually converge to an adjustable neighborhood near the origin.Moreover,an enhanced GBNSP control scheme incorporates an improved gain scaling mechanism to withstand unknown external disturbances.In the end,the effectiveness and practicality of the proposed scheme are validated by a theoretical example and a practical example. 展开更多
关键词 Feedforward nonlinear systems gain scaling control impulsive FDI attacks neural secure protection control unknown control coefficients
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On-orbit servicing launch dynamics and multi-objective optimization of impulsive rendezvous 认领 引用
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作者 LI Weikang JIANG Ju +1 位作者 BIAN Yue HAN Yanhua 《Journal of Systems Engineering and Electronics》 SCIE CSCD 2026年第2期697-711,共15页
The multi-body dynamics in the launch process of a space platform deploying a server,as well as the optimal double impulse rendezvous guidance law between the server and the target spacecraft,are studied.Firstly,the s... The multi-body dynamics in the launch process of a space platform deploying a server,as well as the optimal double impulse rendezvous guidance law between the server and the target spacecraft,are studied.Firstly,the space platform enters into orbit around the target,keeping its launch tube axis aiming at it.After receiving the launch command,the server shoots out from the launch tube,flying to the target.Due to body coupling,the platform’s attitude is disturbed,preventing the server from accurately aiming at the target during separation.The server uses its small rocket engine to apply two velocity pulses:the first one to adjust its trajectory for rendezvous,and the second near the target to reduce relative velocity to zero for soft docking.A two-body dynamics model is established using the Newton-Euler method,and a virtual prototype is developed in ADAMS for validation.To solve the multi-objective optimization subject to energy consumption and flight time for rendezvous,an improved non-dominated sorting genetic algorithm II(NSGA-II)algorithm is proposed.Simulation results show that launch-induced perturbations are non-negligible,and the proposed algorithm effectively derives the optimal guidance law that balances energy use and flight time. 展开更多
关键词 multi-body dynamics virtual prototype impulse rendezvous multi-objective optimization on-orbit servicing
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Impulsive thrust strategy for orbital pursuit-evasion games based on impulse-like constraint 认领 引用 被引量：6
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作者 Hongbo WANG Yao ZHANG +1 位作者 Hao LIU Kunpeng ZHANG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2025年第1期520-536,共17页
This paper proposes a novel impulsive thrust strategy guided by optimal continuous thrust strategy to address two-player orbital pursuit-evasion game under impulsive thrust control.The strategy seeks to enhance the in... This paper proposes a novel impulsive thrust strategy guided by optimal continuous thrust strategy to address two-player orbital pursuit-evasion game under impulsive thrust control.The strategy seeks to enhance the interpretability of impulsive thrust strategy by integrating it within the framework of differential game in traditional continuous systems.First,this paper introduces an impulse-like constraint,with periodical changes in thrust amplitude,to characterize the impulsive thrust control.Then,the game with the impulse-like constraint is converted into the two-point boundary value problem,which is solved by the combined shooting and deep learning method proposed in this paper.Deep learning and numerical optimization are employed to obtain the guesses for unknown terminal adjoint variables and the game terminal time.Subsequently,the accurate values are solved by the shooting method to yield the optimal continuous thrust strategy with the impulse-like constraint.Finally,the shooting method is iteratively employed at each impulse decision moment to derive the impulsive thrust strategy guided by the optimal continuous thrust strategy.Numerical examples demonstrate the convergence of the combined shooting and deep learning method,even if the strongly nonlinear impulse-like constraint is introduced.The effect of the impulsive thrust strategy guided by the optimal continuous thrust strategy is also discussed. 展开更多
关键词 Orbital pursuit-evasion game Differential game Impulsive thrust Deep learning Shooting method
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Variable reward function-driven strategies for impulsive orbital attack-defense games under multiple constraints and victory conditions 认领 引用 被引量：3
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作者 Liran Zhao Sihan Xu +1 位作者 Qinbo Sun Zhaohui Dang 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2025年第9期159-183,共25页
This paper investigates impulsive orbital attack-defense(AD)games under multiple constraints and victory conditions,involving three spacecraft:attacker,target,and defender.In the AD scenario,the attacker aims to breac... This paper investigates impulsive orbital attack-defense(AD)games under multiple constraints and victory conditions,involving three spacecraft:attacker,target,and defender.In the AD scenario,the attacker aims to breach the defender's interception to rendezvous with the target,while the defender seeks to protect the target by blocking or actively pursuing the attacker.Four different maneuvering constraints and five potential game outcomes are incorporated to more accurately model AD game problems and increase complexity,thereby reducing the effectiveness of traditional methods such as differential games and game-tree searches.To address these challenges,this study proposes a multiagent deep reinforcement learning solution with variable reward functions.Two attack strategies,Direct attack(DA)and Bypass attack(BA),are developed for the attacker,each focusing on different mission priorities.Similarly,two defense strategies,Direct interdiction(DI)and Collinear interdiction(CI),are designed for the defender,each optimizing specific defensive actions through tailored reward functions.Each reward function incorporates both process rewards(e.g.,distance and angle)and outcome rewards,derived from physical principles and validated via geometric analysis.Extensive simulations of four strategy confrontations demonstrate average defensive success rates of 75%for DI vs.DA,40%for DI vs.BA,80%for CI vs.DA,and 70%for CI vs.BA.Results indicate that CI outperforms DI for defenders,while BA outperforms DA for attackers.Moreover,defenders achieve their objectives more effectively under identical maneuvering capabilities.Trajectory evolution analyses further illustrate the effectiveness of the proposed variable reward function-driven strategies.These strategies and analyses offer valuable guidance for practical orbital defense scenarios and lay a foundation for future multi-agent game research. 展开更多
关键词 Orbital attack-defense game Impulsive maneuver Multi-agent deep reinforcement learning Reward function design
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Distributed Saturated Impulsive Quasi-Consensus for Leader-Follower Multi-Agent Systems:An Open Topology Framework 认领 引用 被引量：1
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作者 Haitao Zhu Jianquan Lu +1 位作者 Yijun Lou Xinsong Yang 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2025年第9期1941-1943,共3页
Dear Editor,This letter studies a real-world issue in leader-follower multi-agent systems(MASs)named open topology,which permits the variations of agent set and network connections.Specially,a novel transition process... Dear Editor,This letter studies a real-world issue in leader-follower multi-agent systems(MASs)named open topology,which permits the variations of agent set and network connections.Specially,a novel transition process is developed to explain how the involved variation of network scale affects the dynamic behavior of the MASs.From a resource limited perspective,the distributed saturated impulsive control is then designed,under which some sufficient criteria are integrated into local quasi-consensus performance.We also provide a combined optimization algorithm for all agents to make the estimated domain of initial errors closer to the real one,thereby resulting in less conservativeness.Finally,a numerical example validates our results. 展开更多
关键词 distributed saturated impulsive control leader follower multi agent systems optimization algorithm agent set network open topology transition process open topologywhich quasi consensus
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New Controllability Criteria for Linear Switched and Impulsive Systems 认领 引用
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作者 Jiayuan Yan Bin Hu +2 位作者 Zhi-Hong Guan Yandong Hou Lei Shi 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2025年第4期830-832,共3页
Dear Editor,In this letter,several novel controllability results for a class of linear switched and impulsive systems are established.Different from the developed controllability conditions in most existing literature... Dear Editor,In this letter,several novel controllability results for a class of linear switched and impulsive systems are established.Different from the developed controllability conditions in most existing literature,the important role of switched and impulsive time sequence is considered.Applying the relevant geometric theory of matrix,a necessary and sufficient criterion for the controllability is firstly developed to judge when the controllability of such systems is affected by switched and impulsive time sequence.Furthermore,we further obtain a sufficient controllability condition that can be used to verify the controllability of such systems regardless of the switched and impulsive time sequence.Finally,a numerical example is given to verify the obtained theoretical results. 展开更多
关键词 switched systems controllability linear switched impulsive systems switched impulsive time sequence impulsive systems linear systems developed controllability conditions switched impulsive time
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Self-Triggered Impulsive Control for Nonlinear Stochastic Systems 认领 引用
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作者 Tao Zhan Yi Ji +2 位作者 Yabin Gao Hongyi Li Yuanqing Xia 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2025年第1期264-266,共3页
Dear Editor,This letter deals with the stabilization problem of nonlinear stochastic systems via self-triggered impulsive control(STIC), where the timing of impulsive control actions is not dependent on continuous sta... Dear Editor,This letter deals with the stabilization problem of nonlinear stochastic systems via self-triggered impulsive control(STIC), where the timing of impulsive control actions is not dependent on continuous state monitoring. In contrast to the existing self-triggered control method, novel self-triggered mechanism(STM) is proposed by incorporating a waiting time for stabilizing impulses. This allows for direct prediction of the next impulsive instant. 展开更多
关键词 direct prediction next impulsive instant impulsive control stabilization problem nonlinear stochastic systems impulsive control actions self triggered control state monitoring stabilization
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Finite-Time Stability of Impulsive and Switched Hybrid Systems With Delay-Dependent Impulses 认领 引用
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作者 Taixiang Zhang Jinde Cao +1 位作者 Mahmoud Abdel-Aty Ardak Kashkynbayev 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2025年第2期466-468,共3页
Dear Editor,This letter studies finite-time stability (FTS) of impulsive and switched hybrid systems with delay-dependent impulses. Some conditions, based on Lyapunov method, are proposed for ensuring FTS and estimati... Dear Editor,This letter studies finite-time stability (FTS) of impulsive and switched hybrid systems with delay-dependent impulses. Some conditions, based on Lyapunov method, are proposed for ensuring FTS and estimating settling-time function (STF) of the hybrid systems.When switching dynamics are FTS and impulsive dynamics involve destabilizing delay-dependent impulses, the FTS is retained if the impulses occur infrequently. 展开更多
关键词 finite time stability delay dependent impulses hybrid systemswhen switching dynamics impulsive dynamics impulsive switched hybrid systems switched systems lyapunov method
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Adaptive Self-Triggered Impulsive Fault-Tolerant Control for Multi-Player Constrained Systems 认领 引用
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作者 Lu Liu Ruizhuo Song Lina Xia 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2025年第11期2228-2238,共11页
Considering that actual systems are often constrained by multiple factors such as state limitation,actuator saturation and actuator failure at the same time,this paper provides an effective solution for non-affine mul... Considering that actual systems are often constrained by multiple factors such as state limitation,actuator saturation and actuator failure at the same time,this paper provides an effective solution for non-affine multi-player systems,which can guarantee the required performance while saving communication cost.Initially,an auxiliary system is established to accommodate state limitations,following which the controller design is partitioned into two distinct segments,addressing different types of faults.Specifically,the discontinuous and continuous aspects of the controller are achieved by sliding-mode control(SMC)and adaptive critic design(ACD),respectively.During the implementation of ACD to solve the guaranteed value function incorporating the utility function designed for the asymmetric saturation of the control input,two adaptive schemes including adaptive eventtriggered impulsive control(AETIC)and adaptive self-triggered impulsive control(ASTIC)are introduced successively.It is proved that the system maintains exponential stability rather than asymptotic stability and the state signals keep ultimately uniformly bounded(UUB).Finally,the effectiveness of the proposed control sequence is verified by simulation comparisons. 展开更多
关键词 Adaptive critic design(ACD) impulsive control(IC) self-triggered control(STC) sliding-mode control(SMC)
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Finite-Time Sliding-Mode Control for Semi-Markov Systems With Delayed Impulses 认领 引用 被引量：1
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作者 Fangmin Ren Xiaoping Wang +1 位作者 Yangmin Li Zhigang Zeng 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2026年第3期740-742,共3页
Dear Editor,This letter concerns the design of sliding mode control(SMC)for semi-Markov switching systems with time-varying transmission and impulse delay.The difficulties of this problem are:1)Time-varying transmissi... Dear Editor,This letter concerns the design of sliding mode control(SMC)for semi-Markov switching systems with time-varying transmission and impulse delay.The difficulties of this problem are:1)Time-varying transmission and impulse delay bring more nonlinear dynamic characteristics and lag effects;2)Semi-Markov mode switching introduces uncertainty;3)The reachable stage and sliding stage are affected by two types of impulses in the system,which increases the complexity of theoretical derivation. 展开更多
关键词 finite time sliding mode control sliding mode control smc semi Markov systems lag effects semi markov reachable stage sliding stage theoretical derivation impulse delay time varying transmission
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A Novel Finite-Time Stability Criterion for Nonlinear Systems Involving Flexible Delayed Impulses 认领 引用
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作者 Shuchen Wu Xiaodi Li Shiji Song 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2026年第3期746-748,共3页
Dear Editor,This letter studies the finite-time stability(FTS)problem of nonlinear impulsive systems with delayed impulses.The system under consideration is subjected to a flexible class of time-varying delays in impu... Dear Editor,This letter studies the finite-time stability(FTS)problem of nonlinear impulsive systems with delayed impulses.The system under consideration is subjected to a flexible class of time-varying delays in impulsive signals,allowing them to arbitrarily span one or more impulse instants.Sufficient Lyapunov-based conditions for FTS of such systems are presented,where a novel class of impulse time sequences is established for all admissible uncertainties of delayed impulses. 展开更多
关键词 delayed impulsesthe impulsive signalsallowing finite time stability nonlinear systems Lyapunov based conditions time varying delays nonlinear impulsive systems delayed impulses
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Revisiting the Effect of Reactive Compatibilization on Polymer Crystallization:From Static Suppression to Shear-induced Promotion 认领 引用
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作者 Bao-Gou Wu Xiao-Hu Bing +4 位作者 Qian Ren Lan Ding Ji-Zhang Li Wen-Ge Zheng Long Wang 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2026年第3期756-767,I0013,共12页
Reactive compatibilization has been widely applied to enhance the compatibility of polymer blends,thereby improving their mechanical properties.However,it generally reduces the chain mobility and regularity,often lead... Reactive compatibilization has been widely applied to enhance the compatibility of polymer blends,thereby improving their mechanical properties.However,it generally reduces the chain mobility and regularity,often leading to slower polymer crystallization.Here,we demonstrate that reactive compatibilization in poly(lactic acid)/poly(butylene adipate-co-terephthalate)(PLA/PBAT)blends unexpectedly promotes PLA matrix crystallization during injection molding,in contrast to the retarded kinetics observed in differential scanning calorimetry isothermal crystallization studies.The phase morphology,rheological behavior,and crystalline structure were systematically analyzed to elucidate markedly different crystallization kinetics under static and shear fields.The potential mechanism underlying crystallization enhancement is attributed to PBAT domain refinement and viscosity increase induced by reactive compatibilization,which,under shear flow,create favorable conditions for crystallization by enhancing PBAT fibril nucleation and retarding the relaxation of oriented PLA chains.This study offers new perspectives on the effect of reactive compatibilization on the polymer crystallization behavior. 展开更多
关键词 Reactive compatibilization Crystallization Static field Shear flow field
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Exponential Synchronization of Infinite-Dimensional Stochastic Systems With Poisson Jumps Under Aperiodically Intermittent Impulse Control 认领 引用
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作者 Lili Chen Yiqun Liu +1 位作者 Yanfeng Zhao Zhen Wang 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2026年第2期383-393,共11页
A novel aperiodically intermittent impulse control(AIIC)method is proposed to investigate the exponential synchronization in mean square(ESMS)of a class of impulsive stochastic infinite-dimensional systems with Poisso... A novel aperiodically intermittent impulse control(AIIC)method is proposed to investigate the exponential synchronization in mean square(ESMS)of a class of impulsive stochastic infinite-dimensional systems with Poisson jumps(ISIDSP).The AIIC control strategy inherits the flexibility of aperiodically intermittent control,including the variable control period,adjustable control interval length,and the discretization of impulsive control.In addition,this article introduces a novel mild Itô's formula.By leveraging semigroup theory,the contraction mapping principle,and graph theory,along with constructing the Lyapunov function,the criterion for the existence and uniqueness of a mild solution of ISIDSP is thereby established.Furthermore,the mean-square exponential synchronization problem of the above systems is resolved,and the constraints within the mild solution domain are alleviated.These criteria clarify the impact of control parameters,control intervals and network topology on ESMS.The theoretical results are subsequently applied to a class of neural networks with reaction-diffusion processes,and the validity of the results is verified using numerical simulations. 展开更多
关键词 Complex network exponential synchronization impulse control infinite dimensional system intermittent control
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Effect of percussive massage treatment and static stretching on muscle tone,stiffness,and strength recovery after exercise-induced muscle fatigue:A randomized controlled study 认领 引用
18
作者 Gangrui Chen Zhongke Gu +2 位作者 Dongling Xin Yuxuan Qi Jiansong Dai 《Sports Medicine and Health Science》 CAS CSCD 2026年第5期524-530,共7页
The aim of this study was to compare the effects of percussive massage treatment and static stretching on muscle tone,stiffness,and strength recovery following exercise fatigue.Sixty subjects were randomly divided int... The aim of this study was to compare the effects of percussive massage treatment and static stretching on muscle tone,stiffness,and strength recovery following exercise fatigue.Sixty subjects were randomly divided into three groups:a control group(CG,n=20),a static stretching group(SSG,n=20),and a percussive massage treatment group(PMTG,n=20).Following exercise-induced muscle fatigue,interventions were applied,including supine rest,static stretching,and percussive massage treatment.Muscle tone,stiffness,and muscle strength indicators were assessed at five time points:before the exercise(Pre-exercise),immediately after exercise(Post-exercise),immediately after therapy intervention(Post-0),24 hours(h)after therapy intervention(Post-24 h),and 48 h after therapy intervention(Post-48 h).Results:At Post-0,muscle tone and stiffness in both the control group and static stretching group were significantly higher than Pre-exercise,while in the percussive massage treatment group,there were no statistically significant differences compared to Pre-exercise.At Post-48 h,peak torque in the control group was significantly lower than Pre-exercise.In contrast,the percussive massage treatment group and static stretching group showed no significant differences at Post-48 h compared to Pre-exercise.These findings indicated that percussive massage therapy is immediately effective in mitigating muscle tone and stiffness after exercise fatigue,whereas static stretching and percussive massage therapy facilitate the recovery of muscle strength within 48 h. 展开更多
关键词 Percussive massage therapy Static stretching Muscle tone and stiffness Muscle strength
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Advances in research on impulse hydro‐turbine technology 认领 引用
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作者 Xiaochao Li Ye Zhou +5 位作者 Hao Zhang Guanglei Xiao Yanwei Li Zhongxin Gao Zhiyang Lu Shangqi Li 《River》 EI CSCD 2026年第1期112-133,共22页
To accelerate the development of impulse hydro‐turbines and support the efficient utilization of hydropower resources in Southwest China,this paper examines the background,historical development,and research progress... To accelerate the development of impulse hydro‐turbines and support the efficient utilization of hydropower resources in Southwest China,this paper examines the background,historical development,and research progress of impulse hydroturbines.By analyzing energy development data,hydropower potential,and research trends in impulse hydro‐turbines,we provide a comprehensive review based on existing studies and technical achievements from domestic and international scholars.This paper focuses on five key components:distributors,injectors(including deflectors),runners,auxiliary systems,and engineering applications.For each part,the working principles and technological progress are detailed.Furthermore,five main findings are highlighted—such as the role of impulse hydropower in addressing China's energy crisis—and five recommendations are put forward,including the need to strengthen related technological capabilities in China.This review aims to provide a reference for further research and industrial development. 展开更多
关键词 hydropower impulse hydro‐turbines Pelton hydro‐turbines numerical simulation sediment erosion
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Energy absorption mechanism and design method of anchor cable under dynamic-static coupling condition 认领 引用
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作者 Qi Wang Jingxuan Liu +4 位作者 Mingzi Wang Bei Jiang Rugang Duan Shuo Xu Xuepeng Wang 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2026年第5期941-956,共16页
To effectively control the large deformation of the surrounding rock under complex conditions,it is often necessary to apply prestress to anchor cables.However,due to the influence of surrounding rock deformation,mini... To effectively control the large deformation of the surrounding rock under complex conditions,it is often necessary to apply prestress to anchor cables.However,due to the influence of surrounding rock deformation,mining disturbance,and strong impact,anchor cables are often in a dynamic and static coupling stress state.Therefore,it is crucial to study the dynamic and static coupling mechanical characteristics of anchor cables.Based on this,the self-developed dynamic and static coupling test equipment is developed.The dynamic and static coupling mechanical test of anchor cables is conducted.Test results indicate that the energy absorption for anchor cables under the initial load of 350 kN decreased by 69.8%compared to the condition without initial load,and the energy absorption efficiency increased by 6.6 times.The increase of initial load can improve its energy absorption efficiency,but it can also lead to a decrease in its energy absorption.The energy absorption and energy absorption efficiency shows a bilinear variation law with the increase of initial load.On this basis,the energy absorption calculation formula and the support design model of the anchor cable are established.It provides new ideas for the safety control of dynamic disasters in deep engineering. 展开更多
关键词 Anchor cable support Working load Dynamic and static coupling test Energy absorption characteristics Design method
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