The underwater wireless optical communication(UWOC)system has gradually become essential to underwater wireless communication technology.Unlike other existing works on UWOC systems,this paper evaluates the proposed ma...The underwater wireless optical communication(UWOC)system has gradually become essential to underwater wireless communication technology.Unlike other existing works on UWOC systems,this paper evaluates the proposed machine learningbased signal demodulation methods through the selfbuilt experimental platform.Based on such a platform,we first construct a real signal dataset with ten modulation methods.Then,we propose a deep belief network(DBN)-based demodulator for feature extraction and multi-class feature classification.We also design an adaptive boosting(Ada Boost)demodulator as an alternative scheme without feature filtering for multiple modulated signals.Finally,it is demonstrated by extensive experimental results that the Ada Boost demodulator significantly outperforms the other algorithms.It also reveals that the demodulator accuracy decreases as the modulation order increases for a fixed received optical power.A higher-order modulation may achieve a higher effective transmission rate when the signal-to-noise ratio(SNR)is higher.展开更多
Dahu-Qinnan molybdenum deposit,located in the northern part of the Xiaoqinling gold province,belongs to the Xiaoqinling-Waifangshan sub-zone of the eastern Qinling Mo-W metallogenic belt,central China.Molybdenite mine...Dahu-Qinnan molybdenum deposit,located in the northern part of the Xiaoqinling gold province,belongs to the Xiaoqinling-Waifangshan sub-zone of the eastern Qinling Mo-W metallogenic belt,central China.Molybdenite mineralization is associated with Au-bearing quartz veins.This paper is based on field observations and PIMA analytical data on the occurrences,and details textures and alteration patterns of Mo-bearing quartz veins in Dahu-Qinnan region.The Mo-bearing quartz veins exhibit friable with cream colored,vuggy,infilling texture and brecciated texture.The breccia clasts within Mo-bearing quartz veins are dominated by gneissic rocks of the Taihua Supergroup,and Mesozoic porphyritic granite dyke with stockwork and disseminated molybdenite mineralization.The breccias are replaced by clay minerals.Alteration associated with molybdenite-bearing quartz veins is characterized by K-feldspar(only in the breccias),sericite,sillicification(residual silica),kaolinite,smectite and anhydrite.Molybdenite with other sulfide minerals infills fissures and pore spaces in the quartz veins.As the results of above,and according to the observed geological events in the area and taking into account the geological setting,molybdenite-bearing quartz veins are likely to have been affected by late acid leaching.The precursor porphyry Mo ore,associated with porphyry granite dyke formed probably at ca.245--211 Ma during the continent-continenl collision of Qinling orogeny.展开更多
为更全面系统了解兰花保鲜国内外研究现状和进展情况,以英文数据库Web of Science(WOS)和中文数据库中国知网(CNKI)收录的兰花保鲜研究文献为数据源,采用CiteSpace计量工具,用文献计量分析方法和知识图谱可视化技术对1989—2021年国内...为更全面系统了解兰花保鲜国内外研究现状和进展情况,以英文数据库Web of Science(WOS)和中文数据库中国知网(CNKI)收录的兰花保鲜研究文献为数据源,采用CiteSpace计量工具,用文献计量分析方法和知识图谱可视化技术对1989—2021年国内外各科研院所发表的研究文献进行梳理统计和数据分析。分析表明,世界范围内兰花保鲜研究论文发文量总体呈现缓慢上升趋势;研究领域中影响力最大的依次是中国、泰国和美国;研究的兰花种类主要集中于石斛兰、蝴蝶兰和文心兰;其中中国学者重点研究蝴蝶兰和文心兰,泰国研究团队主要研究石斛兰;研究方向主要集中于衰老生理方面,其中内源激素乙烯是兰花衰老生理研究的重点,而如何抑制乙烯是兰花保鲜研究中生理实验的热点。根据统计数据综合分析推断,兰花衰老的分子机制、利用分子技术延长花朵寿命将成为兰花保鲜前沿研究重点与新兴趋势。展开更多
基金supported by the major key project of Peng Cheng Laboratory under grant PCL2023AS31 and PCL2023AS1-2the National Key Research and Development Program of China(No.2019YFA0706604)the Natural Science Foundation(NSF)of China(Nos.61976169,62293483,62371451)。
文摘The underwater wireless optical communication(UWOC)system has gradually become essential to underwater wireless communication technology.Unlike other existing works on UWOC systems,this paper evaluates the proposed machine learningbased signal demodulation methods through the selfbuilt experimental platform.Based on such a platform,we first construct a real signal dataset with ten modulation methods.Then,we propose a deep belief network(DBN)-based demodulator for feature extraction and multi-class feature classification.We also design an adaptive boosting(Ada Boost)demodulator as an alternative scheme without feature filtering for multiple modulated signals.Finally,it is demonstrated by extensive experimental results that the Ada Boost demodulator significantly outperforms the other algorithms.It also reveals that the demodulator accuracy decreases as the modulation order increases for a fixed received optical power.A higher-order modulation may achieve a higher effective transmission rate when the signal-to-noise ratio(SNR)is higher.
基金financial support of Jinyuan Mining Industry Co.,Ltd,Lingbao,Henan Province。
文摘Dahu-Qinnan molybdenum deposit,located in the northern part of the Xiaoqinling gold province,belongs to the Xiaoqinling-Waifangshan sub-zone of the eastern Qinling Mo-W metallogenic belt,central China.Molybdenite mineralization is associated with Au-bearing quartz veins.This paper is based on field observations and PIMA analytical data on the occurrences,and details textures and alteration patterns of Mo-bearing quartz veins in Dahu-Qinnan region.The Mo-bearing quartz veins exhibit friable with cream colored,vuggy,infilling texture and brecciated texture.The breccia clasts within Mo-bearing quartz veins are dominated by gneissic rocks of the Taihua Supergroup,and Mesozoic porphyritic granite dyke with stockwork and disseminated molybdenite mineralization.The breccias are replaced by clay minerals.Alteration associated with molybdenite-bearing quartz veins is characterized by K-feldspar(only in the breccias),sericite,sillicification(residual silica),kaolinite,smectite and anhydrite.Molybdenite with other sulfide minerals infills fissures and pore spaces in the quartz veins.As the results of above,and according to the observed geological events in the area and taking into account the geological setting,molybdenite-bearing quartz veins are likely to have been affected by late acid leaching.The precursor porphyry Mo ore,associated with porphyry granite dyke formed probably at ca.245--211 Ma during the continent-continenl collision of Qinling orogeny.
文摘为更全面系统了解兰花保鲜国内外研究现状和进展情况,以英文数据库Web of Science(WOS)和中文数据库中国知网(CNKI)收录的兰花保鲜研究文献为数据源,采用CiteSpace计量工具,用文献计量分析方法和知识图谱可视化技术对1989—2021年国内外各科研院所发表的研究文献进行梳理统计和数据分析。分析表明,世界范围内兰花保鲜研究论文发文量总体呈现缓慢上升趋势;研究领域中影响力最大的依次是中国、泰国和美国;研究的兰花种类主要集中于石斛兰、蝴蝶兰和文心兰;其中中国学者重点研究蝴蝶兰和文心兰,泰国研究团队主要研究石斛兰;研究方向主要集中于衰老生理方面,其中内源激素乙烯是兰花衰老生理研究的重点,而如何抑制乙烯是兰花保鲜研究中生理实验的热点。根据统计数据综合分析推断,兰花衰老的分子机制、利用分子技术延长花朵寿命将成为兰花保鲜前沿研究重点与新兴趋势。
