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Highly stable femtosecond pulse generation from a MXene Ti_3C_2T_x(T = f, O, or OH) mode-locked fiber laser

Photonics Research 2019年第3期7卷 260-264页

作者： JIE LI ZILONG ZHANG LIN DU LILI MIAO JUN YI BIN HUANG YANHONG ZOU CHUJUN ZHAO SHUANGCHUN WEN Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education & Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices School of Physics and Electronics Hunan University

Ultrafast fiber lasers are in great demand for various applications, such as optical communication, spectroscopy,biomedical diagnosis, and industrial fabrication. Here, we report the highly stable femtosecond pulse generation from a MXene mode-locked fiber laser. We have prepared the high-quality Ti_3C_2 T_x nanosheets via the etching method, and characterized their ultrafast dynamics and broadband nonlinear optical responses. The obvious intensity-and wavelength-dependent nonlinear responses have been observed and investigated. In addition, a highly stable femtosecond fiber laser with signal-to-noise ratio up to 70.7 dB and central wavelength of 1567.3 nm has been delivered. The study may provide some valuable design guidelines for the development of ultrafast, broadband nonlinear optical modulators, and open new avenues toward advanced photonic devices based on MXenes.

关键词： Ultrafast fiber lasers femtosecond pulse MXene Ti3C2Tx(T = f, O, or OH) mode-locked fiber laser

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Consecutive-(r,f,k) out-of-n:f和Consecutive-(f,g)-out-of-(r,n):f线性系统的可靠性

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数理统计与管理 2006年第3期25卷 321-328页

作者：杨海生崔利荣北京理工大学管理与经济学院北京100081

Consecutive-(r,f,k)-out-of-n:f系统由n个单元顺序连结而成,仅当在连续的r个单元中,至少有f个失效或者至少连续k个失效,整个系统才失效;而Consecutive-(f,g)-out-of-(r,n):f系统由n个单元顺序连结而成,仅当在整个系统中至少有f个失效... 详细信息

Consecutive-(r,f,k)-out-of-n:f系统由n个单元顺序连结而成,仅当在连续的r个单元中,至少有f个失效或者至少连续k个失效,整个系统才失效;而Consecutive-(f,g)-out-of-(r,n):f系统由n个单元顺序连结而成,仅当在整个系统中至少有f个失效或者在连续的r个单元中,至少有g个失效,整个系统才失效。本文运用马氏链嵌入方法,在单元之间相互独立以及单元之间马氏相关这两种情况下,给出线性系统的可靠性。

关键词： Consecutive-(r, f, k)-out-of-n: f系统 Consecutive-(f,g)-out-of-( r, n):f系统可靠性马氏链嵌入法线性系统

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Inheritance Tendency of Storage Root Quality Traits in f_1 Hybrids of ‘Xushu 25'and ‘Xu 22-5'

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Agricultural Biotechnology 2014年第6期3卷 19-23页

作者： Meng KOU Qiang LI Yungang ZHANG Xin WANG Zhonghou TANG Wei TANG Xiuying LI Daifu MA Xuzhou Sweetpotato Research Center Sweetpotato Research Institute Chinese Academy of Agricultural Sciences Key Laboratory of Sweetpotato Genetic Improvement Chinese Academy of Agricultural Sciences

＇ Xushu 25＇ , ＇ Xu 22-5＇ and their reciprocal f1 hybrids were used as experimental materials to analyze the inheritance tendency of storage root quality traits of sweetpotato. The results showed that most of the storage root traits in f~ hybrids of ＇ Xushu 25 ＇ and ＇ Xu 22-5 ＇ were quantitative traits controlled by multi- pie genes. The carotenoid content in fresh storage roots of f1 hybrids was lower than that of parents, with the average genetic transmitting ability and average coeffi- cient of variation at 51.17% and 103.21%, respectively. The starch content in fresh storage roots reached mid-parent level, with the average genetic transmitting ability at 96.66%. The reducing sugar content in fresh storage roots of f, hybrids tended to be polarized; to be specific, most of the ft hybrids exhibited higher re- ducing sugar content than their parents with high reducing sugar content or exhibited lower reducing sugar content than their parents with low reducing sugar content, but f~ hybrids with reducing sugar content ranging between that of their parents accounted for a small proportion. The soluble sugar content in fresh storage roots reached mid-parent level and tended to be lower than parents, with the average genetic transmitting ability and average coefficient of variation at 82.25% and 21.93%, respectively. The crude protein content in fresh storage roots of fI hybrids exceeded mid-parent level and tended to increase; positive-crossing and negative-crossing progenies exhibiting higher crude protein content than their parents with high crude protein content accounted for 15.53% and 16. 28%, respectively.

关键词： Sweetpotato f, Quality Inheritance tendency

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