A method of spectrum estimation based on the genetic simulated annealing(GSA)algorithm is proposed,which is applied to retrieve the three-dimensional wind field of typhoon Nangka observed by our research group.Compare...A method of spectrum estimation based on the genetic simulated annealing(GSA)algorithm is proposed,which is applied to retrieve the three-dimensional wind field of typhoon Nangka observed by our research group.Compared to the genetic algorithm(GA),the GSA algorithm not only extends the detection range and guarantees the accuracy of retrieval results but also demonstrates a faster retrieval speed.Experimental results indicate that both the GA and GSA algorithms can enhance the detection range by 35%more than the least squares method.However,the convergence speed of the GSA algorithm is 17 times faster than that of the GA,which is more beneficial for real-time data processing.展开更多
Pulse echo accumulation is commonly employed in coherent Doppler wind LiDAR(light detection and ranging)under the assumption of steady wind.Here,the measured spectral data are analyzed in the time dimension and freque...Pulse echo accumulation is commonly employed in coherent Doppler wind LiDAR(light detection and ranging)under the assumption of steady wind.Here,the measured spectral data are analyzed in the time dimension and frequency dimension to cope with the temporal wind shear and achieve the optimal accumulation time.A hardware-efficient algorithm combining the interpolation and cross-correlation is used to enhance the wind retrieval accuracy by reducing the frequency sampling interval and then reduce the spectral width calculation error.Moreover,the temporal broadening effect and spatial broadening effect are decoupled according to the strategy we developed.展开更多
为了解决MnO_(2)正极在水系锌离子电池中循环稳定性差及离子运输缓慢等问题,采用直写成型技术制备高精度定制的3D打印MnO_(2)正极。流变测试表明,打印墨水表现出剪切变稀行为,存储模量平台值高达10^(5) Pa。SEM图像显示,100次循环后该...为了解决MnO_(2)正极在水系锌离子电池中循环稳定性差及离子运输缓慢等问题,采用直写成型技术制备高精度定制的3D打印MnO_(2)正极。流变测试表明,打印墨水表现出剪切变稀行为,存储模量平台值高达10^(5) Pa。SEM图像显示,100次循环后该定制网-层状结构保持完整。具有良好力学强度的3D结构有利于降低电极内残余应力,同时提供更大的比表面积。所得的3D打印正极在50 m A/g的电流密度下循环110次后,比容量为对照传统2D电极的4倍。采用多种非原位技术系统研究了3D打印电池的可逆Mn^(2+)/Mn^(4+)双氧化还原储能机制。展开更多
The switching behavior of antiferroelectric domain structures under the applied electric field is not fully understood.In this work,by using the phase field simulation,we have studied the polarization switching proper...The switching behavior of antiferroelectric domain structures under the applied electric field is not fully understood.In this work,by using the phase field simulation,we have studied the polarization switching property of antiferroelectric domains.Our results indicate that the ferroelectric domains nucleate preferably at the boundaries of the antiferroelectric domains,and antiferroelectrics with larger initial domain sizes possess a higher coercive electric field as demonstrated by hysteresis loops.Moreover,we introduce charge defects into the sample and numerically investigate their influence.It is also shown that charge defects can induce local ferroelectric domains,which could suppress the saturation polarization and narrow the enclosed area of the hysteresis loop.Our results give insights into understanding the antiferroelectric phase transformation and optimizing the energy storage property in experiments.展开更多
基金supported by the Pre-research Project of Civilian Space(No.D040103)the Joint Project of National Natural Science Foundation of China(No.U23A20379)。
文摘A method of spectrum estimation based on the genetic simulated annealing(GSA)algorithm is proposed,which is applied to retrieve the three-dimensional wind field of typhoon Nangka observed by our research group.Compared to the genetic algorithm(GA),the GSA algorithm not only extends the detection range and guarantees the accuracy of retrieval results but also demonstrates a faster retrieval speed.Experimental results indicate that both the GA and GSA algorithms can enhance the detection range by 35%more than the least squares method.However,the convergence speed of the GSA algorithm is 17 times faster than that of the GA,which is more beneficial for real-time data processing.
基金Project supported by the Shanghai Science and Technology Innovation Action(Grant No.22dz1208700).
文摘Pulse echo accumulation is commonly employed in coherent Doppler wind LiDAR(light detection and ranging)under the assumption of steady wind.Here,the measured spectral data are analyzed in the time dimension and frequency dimension to cope with the temporal wind shear and achieve the optimal accumulation time.A hardware-efficient algorithm combining the interpolation and cross-correlation is used to enhance the wind retrieval accuracy by reducing the frequency sampling interval and then reduce the spectral width calculation error.Moreover,the temporal broadening effect and spatial broadening effect are decoupled according to the strategy we developed.
基金funded by Open Research Fund of State Key Laboratory of Precision Manufacturing for Extreme Service Performance, Central South University, China (No. Kfkt2020-01)Hunan Provincial Natural Science Foundation, China (No. 2021JJ40774)the Project of State Key Laboratory of High Performance Complex Manufacturing, Central South University, China (No. ZZYJKT2021-01)。
基金The financial support of the Natural Science Foundation of Changsha,China(No.kq2202094)the National Key R&D Program of China(No.2021YFB3701400)。
文摘为了解决MnO_(2)正极在水系锌离子电池中循环稳定性差及离子运输缓慢等问题,采用直写成型技术制备高精度定制的3D打印MnO_(2)正极。流变测试表明,打印墨水表现出剪切变稀行为,存储模量平台值高达10^(5) Pa。SEM图像显示,100次循环后该定制网-层状结构保持完整。具有良好力学强度的3D结构有利于降低电极内残余应力,同时提供更大的比表面积。所得的3D打印正极在50 m A/g的电流密度下循环110次后,比容量为对照传统2D电极的4倍。采用多种非原位技术系统研究了3D打印电池的可逆Mn^(2+)/Mn^(4+)双氧化还原储能机制。
基金The National Key Research and Development Project of China under Grant No.2016YFB0200903National Natural Science Foundation of China under Grant No.51776154Shaanxi Key Research and Development Project under Grant No.S2018-YF-GHZD-0004
基金supported by the National Natural Science Foundation of China(92169113)the CAS Project for Young Scientists in Basic Research(YSBR-010)+1 种基金the National Key R&D Program of China(2022YFC2302900)the Key Research Program of Frontier Sciences of CAS(ZDBS-LY-SM025)。
基金Project supported by the Natural Science Foundation of Jiangsu Province of China(Grant No.BK20190405)the LOEWE program of the State of Hesse,Germany,within the project FLAME(Fermi Level Engineering of Antiferroelectric Materials for Energy Storage and Insulation Systems)。
文摘The switching behavior of antiferroelectric domain structures under the applied electric field is not fully understood.In this work,by using the phase field simulation,we have studied the polarization switching property of antiferroelectric domains.Our results indicate that the ferroelectric domains nucleate preferably at the boundaries of the antiferroelectric domains,and antiferroelectrics with larger initial domain sizes possess a higher coercive electric field as demonstrated by hysteresis loops.Moreover,we introduce charge defects into the sample and numerically investigate their influence.It is also shown that charge defects can induce local ferroelectric domains,which could suppress the saturation polarization and narrow the enclosed area of the hysteresis loop.Our results give insights into understanding the antiferroelectric phase transformation and optimizing the energy storage property in experiments.
