Carbon nanoparticles（C-dots） were prepared by refluxing the combustion soots of candles and corn stalk in nitric acid.The synthesized C-dots were characterized.The results showed a sharp increase in oxygen content a...Carbon nanoparticles（C-dots） were prepared by refluxing the combustion soots of candles and corn stalk in nitric acid.The synthesized C-dots were characterized.The results showed a sharp increase in oxygen content and a sharp decrease in carbon content after oxidation.The C-dots had-OH and-CO2H groups introduced which made them hydrophilic.However,their difference was also obvious.The C-dots from candle soot had a 10-45 nm broad particle size distribution,and those from corn stalk soot had a 6-18 nm relatively small and narrow size distribution.The C-dots were mainly of sp2 and sp3 carbon structure different from the C-dots of diamond-like structure from candle soot.Interestingly,two kinds of C-dots all exhibited unique photoluminescent properties.The obtained C-dots have potential applications in a broad range of areas.展开更多
The Fabry-Perot resonator (FPR) antenna has found wide applications in microwave and millimeter waves and recently attracted considerable interest. In this paper, a summary of planar and cylindrical structures, analyt...The Fabry-Perot resonator (FPR) antenna has found wide applications in microwave and millimeter waves and recently attracted considerable interest. In this paper, a summary of planar and cylindrical structures, analytic models and research development is presented, and a comparison between these structures and analytic models is made, showing that such analytic models as the FP cavity mode, electromagnetic band gap (EBG) defect mode, transmission line mode, and leaky-wave mode are consistent when applied to analyze this type of resonator antenna. Some interesting topics under recent research, including dual or multi-band, improvement of gain bandwidth, low profile and beam control, are surveyed.展开更多
基金Funded by the National Natural Science Foundation of China(Nos.21465019 and 21266023)the Ningxia Natural Science Founds(NZ13011)+2 种基金the Research Project for Science and Technology of Higher Education of Ningxia Provine of China(NGY2014011)the Science and Technology Planning Project of Jiangsu Entryexit Inspection Quarantine Bureauof China(2016KJ50)the Zhenjiang Social Development Project(SH2014021)
文摘Carbon nanoparticles（C-dots） were prepared by refluxing the combustion soots of candles and corn stalk in nitric acid.The synthesized C-dots were characterized.The results showed a sharp increase in oxygen content and a sharp decrease in carbon content after oxidation.The C-dots had-OH and-CO2H groups introduced which made them hydrophilic.However,their difference was also obvious.The C-dots from candle soot had a 10-45 nm broad particle size distribution,and those from corn stalk soot had a 6-18 nm relatively small and narrow size distribution.The C-dots were mainly of sp2 and sp3 carbon structure different from the C-dots of diamond-like structure from candle soot.Interestingly,two kinds of C-dots all exhibited unique photoluminescent properties.The obtained C-dots have potential applications in a broad range of areas.
基金Project (Nos. 60671016 and 60621002) supported by the National Natural Science Foundation of China
文摘The Fabry-Perot resonator (FPR) antenna has found wide applications in microwave and millimeter waves and recently attracted considerable interest. In this paper, a summary of planar and cylindrical structures, analytic models and research development is presented, and a comparison between these structures and analytic models is made, showing that such analytic models as the FP cavity mode, electromagnetic band gap (EBG) defect mode, transmission line mode, and leaky-wave mode are consistent when applied to analyze this type of resonator antenna. Some interesting topics under recent research, including dual or multi-band, improvement of gain bandwidth, low profile and beam control, are surveyed.
