Dielectric pulse capacitors are of great concerns due to the fast charge/discharge rate and high-power density over traditional counterparts.However,energy-storage capacitor in power converters typically works at a la...Dielectric pulse capacitors are of great concerns due to the fast charge/discharge rate and high-power density over traditional counterparts.However,energy-storage capacitor in power converters typically works at a large DC-biased voltage,where the energy-storge density(Wdis)and efficiency(h)will dramatically decay,thus fatally blocks its further applications.Herein,we proposed a synergistic strategy to achieve a comprehensively improved energy storage property in Bi1exNaxTiO_(3)-NaNbO_(3)based ceramics.Configuration of chemical composition optimization,A-site vacancy engineering,grain size refinement,and sample thickness reduction were designed in the ceramics.Finally,an optimum Wdis of 8.04 J/cm^(3)and an ultrahigh h of 85%was achieved for the 0.50(0.95Bi_(0.52)Na_(0.44)TiO_(3)-0.05SrZrO_(3))-0.50NaNbO_(3)composite under a breakdown strength of 630 kV/cm,along with a stable DC-biased capacitance retention.Additionally,a superior performance stability was affirmed in a wide temperature/frequency range(25-150℃and 1-100 Hz,respectively).It also exhibits an impressive ability in fatigue resistance after being subjected to up to 106 cycles,which enable it to be a suitable candidate for high energy density storage devices.展开更多
This paper investigates the application of the Nash equilibrium solution method within 2-versus-1 impulsive orbital pursuit–evasion(P-E)scenarios,involving 2 pursuers and an evader.Through the integration of game the...This paper investigates the application of the Nash equilibrium solution method within 2-versus-1 impulsive orbital pursuit–evasion(P-E)scenarios,involving 2 pursuers and an evader.Through the integration of game theory and coordinated strategies between the pursuers,the initial 2-pursuer 1-evader game((P_(1),P_(2))-E)is transformed into a composite 1-pursuer 1-evader game(P_(2)-(P_(1)-E)).To address the core challenge of the P-E game,we utilize the MinMax bilateral optimization algorithm to determine optimal strategies in each game iteration,ensuring fairness and equal opportunities for all involved parties.Within the composite P-E framework,the second pursuer(P_(2))assumes responsibility for executing a coordinated pursuit strategy,including the evaluation and tracking of the anticipated outcome of P_(1)−E.Subsequently,the evader formulates an optimal counterplay by reverse engineering the potential role assignments and strategies of the pursuers.In order to explore the intricate aspects of these scenarios,our study harnesses Monte Carlo statistical methods,offering insights into critical factors such as initial positions,impulse intervals,and magnitudes of delta-V within orbital settings,all of which substantially influence game outcomes.Ultimately,this research not only advances our understanding of multiagent orbital P-E dynamics but also establishes a foundation for more informed and effective strategic planning in practical space missions.It aims to ensure mission success and responsible resource allocation in the domain of space exploration.展开更多
基金the National Natural Science Foundation of China(No.52372101,52032005)。
文摘Dielectric pulse capacitors are of great concerns due to the fast charge/discharge rate and high-power density over traditional counterparts.However,energy-storage capacitor in power converters typically works at a large DC-biased voltage,where the energy-storge density(Wdis)and efficiency(h)will dramatically decay,thus fatally blocks its further applications.Herein,we proposed a synergistic strategy to achieve a comprehensively improved energy storage property in Bi1exNaxTiO_(3)-NaNbO_(3)based ceramics.Configuration of chemical composition optimization,A-site vacancy engineering,grain size refinement,and sample thickness reduction were designed in the ceramics.Finally,an optimum Wdis of 8.04 J/cm^(3)and an ultrahigh h of 85%was achieved for the 0.50(0.95Bi_(0.52)Na_(0.44)TiO_(3)-0.05SrZrO_(3))-0.50NaNbO_(3)composite under a breakdown strength of 630 kV/cm,along with a stable DC-biased capacitance retention.Additionally,a superior performance stability was affirmed in a wide temperature/frequency range(25-150℃and 1-100 Hz,respectively).It also exhibits an impressive ability in fatigue resistance after being subjected to up to 106 cycles,which enable it to be a suitable candidate for high energy density storage devices.
基金supported by the National Key R&D Program of China:Gravitational Wave Detection Project(Nos.2021YFC22026,2021YFC2202601,2021YFC2202603)the National Natural Science Foundation of China(No.12172288).
文摘This paper investigates the application of the Nash equilibrium solution method within 2-versus-1 impulsive orbital pursuit–evasion(P-E)scenarios,involving 2 pursuers and an evader.Through the integration of game theory and coordinated strategies between the pursuers,the initial 2-pursuer 1-evader game((P_(1),P_(2))-E)is transformed into a composite 1-pursuer 1-evader game(P_(2)-(P_(1)-E)).To address the core challenge of the P-E game,we utilize the MinMax bilateral optimization algorithm to determine optimal strategies in each game iteration,ensuring fairness and equal opportunities for all involved parties.Within the composite P-E framework,the second pursuer(P_(2))assumes responsibility for executing a coordinated pursuit strategy,including the evaluation and tracking of the anticipated outcome of P_(1)−E.Subsequently,the evader formulates an optimal counterplay by reverse engineering the potential role assignments and strategies of the pursuers.In order to explore the intricate aspects of these scenarios,our study harnesses Monte Carlo statistical methods,offering insights into critical factors such as initial positions,impulse intervals,and magnitudes of delta-V within orbital settings,all of which substantially influence game outcomes.Ultimately,this research not only advances our understanding of multiagent orbital P-E dynamics but also establishes a foundation for more informed and effective strategic planning in practical space missions.It aims to ensure mission success and responsible resource allocation in the domain of space exploration.
