缺血性中风(ischemic stroke,IS)是临床常见的脑血管疾病,发病后大脑功能出现特异性改变,导致患者出现一系列神经功能缺损的临床表现。随着针刺治疗的广泛应用及功能磁共振成像(functional magnetic resonance imaging,fMRI)的发展,IS...缺血性中风(ischemic stroke,IS)是临床常见的脑血管疾病,发病后大脑功能出现特异性改变,导致患者出现一系列神经功能缺损的临床表现。随着针刺治疗的广泛应用及功能磁共振成像(functional magnetic resonance imaging,fMRI)的发展,IS发病及针刺干预机制的研究越来越受到关注。本文基于fMRI技术,对IS后大脑功能方面的特异性改变及针刺干预机制的应用进展进行综述,同时指出当前研究存在的不足,探讨未来研究方向,推动对IS神经病理改变及针刺干预机制的fMRI研究进一步深入,提升针刺治疗的有效性和科学性。展开更多
Aqueous zinc ion batteries are regarded as one of the most promising candidates for large-scale energy stor-age due to their high safety,cost-effectiveness,and environ-mental friendliness.However,uncontrolled zinc den...Aqueous zinc ion batteries are regarded as one of the most promising candidates for large-scale energy stor-age due to their high safety,cost-effectiveness,and environ-mental friendliness.However,uncontrolled zinc dendrite growth and side reactions of the zinc anode decrease the sta-bility of Zn batteries.We report the synthesis of an air-oxid-ized carbon nanotube(O-CNT)film by chemical vapor de-position followed by heat treatment in air which is used as a protective layer on the Zn foil to suppress zinc dendrite growth.The increase in the hydrophilicity of the O-CNT film caused by air oxidation facilitates zinc deposition between the film and the anode instead of deposition on the film surface.The porous structure of the O-CNT film homogenizes the Zn^(2+)ion flux and the electric field on the surface of the Zn foil,leading to the uniform deposition of Zn.As a result,a O-CNT@Zn symmetric cell has a much better cycling stability with a life of more than 3000 h at 1 mA cm^(−2) with a capacity of 1 mAh cm^(−2),and values of more than 2000 h and 1 mAh cm^(−2) at 5 mA cm^(−2).In addition,a O-CNT@Zn||Mn^(2+)inserted hydrated vanadium pentoxide(MnVOH)full cell has a better rate per-formance than a Zn||MnVOH cell,achieving a high discharge capacity of 194 mAh g^(−1) at a high current density of 8 A g^(−1).In a long-term cycling test,the O-CNT@Zn||MnVOH full cell has a capacity retention of 58.8%after 2000 cycles at a current density of 5 A·g^(−1).展开更多
随着无人机的广泛应用,无人机控制器的设计成为近年来广泛研究的热点。当前无人机中广泛使用的PID,MPC等控制算法受到参数难调节、模型构建复杂、计算量大等一系列因素的制约。针对上述问题,提出了一种基于深度强化学习的无人机自主控...随着无人机的广泛应用,无人机控制器的设计成为近年来广泛研究的热点。当前无人机中广泛使用的PID,MPC等控制算法受到参数难调节、模型构建复杂、计算量大等一系列因素的制约。针对上述问题,提出了一种基于深度强化学习的无人机自主控制方法。该方法通过神经网络拟合无人机控制器,直接将无人机的状态映射到舵机的输出以控制无人机运动,在不断与环境进行交互训练中即可得到一个通用的无人机控制器,有效地避免了参数调节、模型构建等复杂操作。同时,为进一步提高模型的收敛速度和准确性,在传统强化学习算法Soft Actor Critic(SAC)的基础之上引入专家信息,提出了ESAC算法,指导无人机对环境进行探索,以增强控制策略的易用性和扩展性。最后在无人机的位置控制以及轨迹跟踪任务中,通过与传统PID控制器和SAC,DDPG等强化学习算法构建的模型控制器进行对比,实验结果表明,通过ESAC算法构建的控制器能够达到与PID控制器同样甚至更优的控制效果,同时在稳定性和准确性上优于SAC和DDPG构建的控制器。展开更多
文摘缺血性中风(ischemic stroke,IS)是临床常见的脑血管疾病,发病后大脑功能出现特异性改变,导致患者出现一系列神经功能缺损的临床表现。随着针刺治疗的广泛应用及功能磁共振成像(functional magnetic resonance imaging,fMRI)的发展,IS发病及针刺干预机制的研究越来越受到关注。本文基于fMRI技术,对IS后大脑功能方面的特异性改变及针刺干预机制的应用进展进行综述,同时指出当前研究存在的不足,探讨未来研究方向,推动对IS神经病理改变及针刺干预机制的fMRI研究进一步深入,提升针刺治疗的有效性和科学性。
基金supported by the National Natural Science Foundation of China(22179093 and21905202)。
文摘Aqueous zinc ion batteries are regarded as one of the most promising candidates for large-scale energy stor-age due to their high safety,cost-effectiveness,and environ-mental friendliness.However,uncontrolled zinc dendrite growth and side reactions of the zinc anode decrease the sta-bility of Zn batteries.We report the synthesis of an air-oxid-ized carbon nanotube(O-CNT)film by chemical vapor de-position followed by heat treatment in air which is used as a protective layer on the Zn foil to suppress zinc dendrite growth.The increase in the hydrophilicity of the O-CNT film caused by air oxidation facilitates zinc deposition between the film and the anode instead of deposition on the film surface.The porous structure of the O-CNT film homogenizes the Zn^(2+)ion flux and the electric field on the surface of the Zn foil,leading to the uniform deposition of Zn.As a result,a O-CNT@Zn symmetric cell has a much better cycling stability with a life of more than 3000 h at 1 mA cm^(−2) with a capacity of 1 mAh cm^(−2),and values of more than 2000 h and 1 mAh cm^(−2) at 5 mA cm^(−2).In addition,a O-CNT@Zn||Mn^(2+)inserted hydrated vanadium pentoxide(MnVOH)full cell has a better rate per-formance than a Zn||MnVOH cell,achieving a high discharge capacity of 194 mAh g^(−1) at a high current density of 8 A g^(−1).In a long-term cycling test,the O-CNT@Zn||MnVOH full cell has a capacity retention of 58.8%after 2000 cycles at a current density of 5 A·g^(−1).
文摘随着无人机的广泛应用,无人机控制器的设计成为近年来广泛研究的热点。当前无人机中广泛使用的PID,MPC等控制算法受到参数难调节、模型构建复杂、计算量大等一系列因素的制约。针对上述问题,提出了一种基于深度强化学习的无人机自主控制方法。该方法通过神经网络拟合无人机控制器,直接将无人机的状态映射到舵机的输出以控制无人机运动,在不断与环境进行交互训练中即可得到一个通用的无人机控制器,有效地避免了参数调节、模型构建等复杂操作。同时,为进一步提高模型的收敛速度和准确性,在传统强化学习算法Soft Actor Critic(SAC)的基础之上引入专家信息,提出了ESAC算法,指导无人机对环境进行探索,以增强控制策略的易用性和扩展性。最后在无人机的位置控制以及轨迹跟踪任务中,通过与传统PID控制器和SAC,DDPG等强化学习算法构建的模型控制器进行对比,实验结果表明,通过ESAC算法构建的控制器能够达到与PID控制器同样甚至更优的控制效果,同时在稳定性和准确性上优于SAC和DDPG构建的控制器。
