针对地质建模时,人工识别山体内部岩石的局限性、低效率且易受主观因素影响等问题,提出了基于地震波反射信号的岩石类型自动识别技术。通过处理地震波反射信号获得岩石力学参数,采用Decision Tree ID3算法,提取岩石密度、波速、弹性模...针对地质建模时,人工识别山体内部岩石的局限性、低效率且易受主观因素影响等问题,提出了基于地震波反射信号的岩石类型自动识别技术。通过处理地震波反射信号获得岩石力学参数,采用Decision Tree ID3算法,提取岩石密度、波速、弹性模量、剪切模量,构建岩性识别模型分类器。通过该分类器对某山体内部岩石类型进行判断,研究结果证明:研究区内部多为辉长岩,玄武岩最少,通过模型分类结果与研究区真实地质对比分析,玄武岩正判率达到93%,安山岩、闪长岩正判率达到100%,花岗岩正判率达到88%,决策树建立的分类器模型能够基于地震波反射信号高效、准确地识别岩石岩性。展开更多
Continuous blood glucose monitoring is important for the diagnosis,treatment,and study of diabetes. many organizations have been working on this subject in recent two decades. Glucose concentration in interstitial flu...Continuous blood glucose monitoring is important for the diagnosis,treatment,and study of diabetes. many organizations have been working on this subject in recent two decades. Glucose concentration in interstitial fluid is closely related to the blood glucose levels. Minimally invasive continuous blood glucose monitoring technology based on the glucose detection in interstitial fluid develops rapidly and gets more and more attentions from the patients and the doctors,due to its instantaneous real-time display of glucose level,"24/7"coverage,and the ability to characterize glycemic variability. According to the different detection methods,most of the continuous glucose monitoring technology could be divided into two kinds: subcutaneous implantation method and transdermal extraction method. This paper review s the recent development of minimally invasive blood glucose monitoring technology and instruments. The mainly remained challenges and related research directions are presented as well.展开更多
Two new 1,3-dithiole derivatives, 4,4＇-{9-[4,5-bis（methylthio）-1,3-dithiol-2-ylidene]-9H-fluorene-2,7- diyl} dipyridine（2a） and 3,3＇-{9-[4,5-bis（methylthio）-1,3-dithiol-2-ylidene]-9H-fluorene-2,7-diyl} dipyrid...Two new 1,3-dithiole derivatives, 4,4＇-{9-[4,5-bis（methylthio）-1,3-dithiol-2-ylidene]-9H-fluorene-2,7- diyl} dipyridine（2a） and 3,3＇-{9-[4,5-bis（methylthio）-1,3-dithiol-2-ylidene]-9H-fluorene-2,7-diyl} dipyridine（2b） were synthesized and characterized by Fourier transform infrared（FTIR）, 1H NMR, 13C NMR and mass spectroscopies. The crystal structure of compound 2b was also studied. The optimized conformations and molecular orbital diagrams of compounds 2a and 2b were illustrated via density functional theory（DFT）. By the time-dependent DFT（TD-DFT） method, electronic absorption spectra of compounds 2a and 2b were predicted and the results achieved were in good agreement with the experimental data. The formation of the cationic radical during the electrochemical oxidation process was also proposed.展开更多
文摘针对地质建模时,人工识别山体内部岩石的局限性、低效率且易受主观因素影响等问题,提出了基于地震波反射信号的岩石类型自动识别技术。通过处理地震波反射信号获得岩石力学参数,采用Decision Tree ID3算法,提取岩石密度、波速、弹性模量、剪切模量,构建岩性识别模型分类器。通过该分类器对某山体内部岩石类型进行判断,研究结果证明:研究区内部多为辉长岩,玄武岩最少,通过模型分类结果与研究区真实地质对比分析,玄武岩正判率达到93%,安山岩、闪长岩正判率达到100%,花岗岩正判率达到88%,决策树建立的分类器模型能够基于地震波反射信号高效、准确地识别岩石岩性。
基金supported by the National Natural Science Foundation of China (No.61176107,No.11204210,No.61428402,and No.61201039)the Key Program of Tianjin Natural Science Foundation (No.15JCZDJC36100)+1 种基金the National High Technology Research and Development Program of China (No.2012AA022602)the 111 Project of China (No.B07014)
文摘Continuous blood glucose monitoring is important for the diagnosis,treatment,and study of diabetes. many organizations have been working on this subject in recent two decades. Glucose concentration in interstitial fluid is closely related to the blood glucose levels. Minimally invasive continuous blood glucose monitoring technology based on the glucose detection in interstitial fluid develops rapidly and gets more and more attentions from the patients and the doctors,due to its instantaneous real-time display of glucose level,"24/7"coverage,and the ability to characterize glycemic variability. According to the different detection methods,most of the continuous glucose monitoring technology could be divided into two kinds: subcutaneous implantation method and transdermal extraction method. This paper review s the recent development of minimally invasive blood glucose monitoring technology and instruments. The mainly remained challenges and related research directions are presented as well.
文摘Two new 1,3-dithiole derivatives, 4,4＇-{9-[4,5-bis（methylthio）-1,3-dithiol-2-ylidene]-9H-fluorene-2,7- diyl} dipyridine（2a） and 3,3＇-{9-[4,5-bis（methylthio）-1,3-dithiol-2-ylidene]-9H-fluorene-2,7-diyl} dipyridine（2b） were synthesized and characterized by Fourier transform infrared（FTIR）, 1H NMR, 13C NMR and mass spectroscopies. The crystal structure of compound 2b was also studied. The optimized conformations and molecular orbital diagrams of compounds 2a and 2b were illustrated via density functional theory（DFT）. By the time-dependent DFT（TD-DFT） method, electronic absorption spectra of compounds 2a and 2b were predicted and the results achieved were in good agreement with the experimental data. The formation of the cationic radical during the electrochemical oxidation process was also proposed.
