The development of zinc ion batteries (ZIBs) with large capacity,high rate,and durable cathode material is a crucial and urgent task.Ni Co_(2)O_(4)(NCO) has received ever-growing interest as a potential cathode materi...The development of zinc ion batteries (ZIBs) with large capacity,high rate,and durable cathode material is a crucial and urgent task.Ni Co_(2)O_(4)(NCO) has received ever-growing interest as a potential cathode material for ZIBs,owing to the high theoretical capacity,rich source,cost-effective,and versatile redox nature.However,due to the slow dynamics of the NCO electrodes,its practical application in highperformance systems is severely limited.Herein,we report an electron density modulated NCO nanosheets (N-NCO NSs) with high-kinetics Zn^(2+)-storage capability as an additive-free cathode for flexible all-solid-state (ASS) ZIBs.By virtue of the enhanced electronic conductivity,improved reaction kinetics,and increased active sites,the optimized N-NCO NSs electrode delivers a high capacity of 357.7 m Ah g^(-1)at 1.0 A g^(-1)and a superior rate capacity of 201.4 m Ah g^(-1)at 20 A g^(-1).More importantly,a flexible ASS ZIBs device is manufactured using a solid polymer electrolyte of a poly (vinylidene fluoride hexafluoropropylene)(PVDF-HFP) film.The flexible ASS ZIBs device shows superb durability with 80.2%capacity retention after 20,000 cycles and works well in the range of-20–70℃.Furthermore,the flexible ASS ZIBs achieves an impressive energy density as high as 578.1 W h kg^(-1)with a peak power density of 33.6 k W kg^(-1),substantially outperforming those latest ZIBs.This work could provide valuable insights for constructing high-kinetics and high-capability cathodes with long-term stability for flexible ASS ZIBs.展开更多
介绍了延时线在雷达中的工作原理,分析了延迟时间误差与延迟幅度误差对信号合成的影响。针对驱动延时组件小型化、高精度设计的难点进行了评估,并提出采用微波多层印制电路实现小型化、采用新型调相电路与衰减电路解决延时高精度的设计...介绍了延时线在雷达中的工作原理,分析了延迟时间误差与延迟幅度误差对信号合成的影响。针对驱动延时组件小型化、高精度设计的难点进行了评估,并提出采用微波多层印制电路实现小型化、采用新型调相电路与衰减电路解决延时高精度的设计方案。在此基础上,设计并实现了一种集成延时、放大与功率分配/合成功能的驱动延时组件。根据驱动延时组件各态收发指标测试结果,幅度带内平坦度优于±0.4 d B,延时相位精度≤±5°,延时幅度精度≤±0.5 d B。展开更多
共振激发控制技术是提高四极离子阱分辨率、灵敏度，实现其多级质谱分析的关键技术。针对质谱仪小型化趋势，提出基于现场可编程门阵列（filed-programmable gate array，FPGA）软件实现直接数字合成器（direct digital synthesizer，DD...共振激发控制技术是提高四极离子阱分辨率、灵敏度，实现其多级质谱分析的关键技术。针对质谱仪小型化趋势，提出基于现场可编程门阵列（filed-programmable gate array，FPGA）软件实现直接数字合成器（direct digital synthesizer，DDS）信号幅度调制的方法，开发出数字式共振激发控制技术，研制出结构更简单的共振激发控制系统。在对性能要求较高的电喷雾离子源-矩形离子阱质谱仪中，应用这套系统实现了单质荷比选择离子、三级质谱分析和600-2000Thomson质荷比范围的全扫描等功能。相比使用模拟技术实现幅度调制的控制单元，数字式共振激发控制单元的功耗只有其10％，系统性能也满足四极离子阱的需求。展开更多
基金the Basic and Applied Basic Research Project of Guangdong Province(2019A1515110827)the Science and Technology Planning Project of Guangzhou(202102080169)+3 种基金the Education Commission of Guangdong Province(2019GKTSCX015)the Advanced Functional Materials Scientific Research and Technical Service Team(X20190197)Guangdong Training Programs of Scientific and Technological Innovation for Undergraduates(pdjh2021a0715)the Innovation Training Program for Undergraduate of Hainan Normal University(2021024)。
文摘The development of zinc ion batteries (ZIBs) with large capacity,high rate,and durable cathode material is a crucial and urgent task.Ni Co_(2)O_(4)(NCO) has received ever-growing interest as a potential cathode material for ZIBs,owing to the high theoretical capacity,rich source,cost-effective,and versatile redox nature.However,due to the slow dynamics of the NCO electrodes,its practical application in highperformance systems is severely limited.Herein,we report an electron density modulated NCO nanosheets (N-NCO NSs) with high-kinetics Zn^(2+)-storage capability as an additive-free cathode for flexible all-solid-state (ASS) ZIBs.By virtue of the enhanced electronic conductivity,improved reaction kinetics,and increased active sites,the optimized N-NCO NSs electrode delivers a high capacity of 357.7 m Ah g^(-1)at 1.0 A g^(-1)and a superior rate capacity of 201.4 m Ah g^(-1)at 20 A g^(-1).More importantly,a flexible ASS ZIBs device is manufactured using a solid polymer electrolyte of a poly (vinylidene fluoride hexafluoropropylene)(PVDF-HFP) film.The flexible ASS ZIBs device shows superb durability with 80.2%capacity retention after 20,000 cycles and works well in the range of-20–70℃.Furthermore,the flexible ASS ZIBs achieves an impressive energy density as high as 578.1 W h kg^(-1)with a peak power density of 33.6 k W kg^(-1),substantially outperforming those latest ZIBs.This work could provide valuable insights for constructing high-kinetics and high-capability cathodes with long-term stability for flexible ASS ZIBs.
文摘介绍了延时线在雷达中的工作原理,分析了延迟时间误差与延迟幅度误差对信号合成的影响。针对驱动延时组件小型化、高精度设计的难点进行了评估,并提出采用微波多层印制电路实现小型化、采用新型调相电路与衰减电路解决延时高精度的设计方案。在此基础上,设计并实现了一种集成延时、放大与功率分配/合成功能的驱动延时组件。根据驱动延时组件各态收发指标测试结果,幅度带内平坦度优于±0.4 d B,延时相位精度≤±5°,延时幅度精度≤±0.5 d B。
文摘共振激发控制技术是提高四极离子阱分辨率、灵敏度，实现其多级质谱分析的关键技术。针对质谱仪小型化趋势，提出基于现场可编程门阵列（filed-programmable gate array，FPGA）软件实现直接数字合成器（direct digital synthesizer，DDS）信号幅度调制的方法，开发出数字式共振激发控制技术，研制出结构更简单的共振激发控制系统。在对性能要求较高的电喷雾离子源-矩形离子阱质谱仪中，应用这套系统实现了单质荷比选择离子、三级质谱分析和600-2000Thomson质荷比范围的全扫描等功能。相比使用模拟技术实现幅度调制的控制单元，数字式共振激发控制单元的功耗只有其10％，系统性能也满足四极离子阱的需求。
