利用深能级瞬态谱(DLTS)方法研究了阴极射线辐照 GaP 纯绿发光二极管(LED)中的深能级,测量到两个激活能为0.45 eV、0.66 eV 的电子陷阱和一个激活能为0.33 eV 的空穴陷阱。证实了0.66 eV 的电子陷阱和0.33 eV 的空穴陷阱与辐照引起的晶...利用深能级瞬态谱(DLTS)方法研究了阴极射线辐照 GaP 纯绿发光二极管(LED)中的深能级,测量到两个激活能为0.45 eV、0.66 eV 的电子陷阱和一个激活能为0.33 eV 的空穴陷阱。证实了0.66 eV 的电子陷阱和0.33 eV 的空穴陷阱与辐照引起的晶格缺陷有关,同时发现阴极射线辐照引起谱峰加宽。展开更多
A simple and novel method has been proposed to determine the enantiomeric composition ofracemate praziquantel(PzQ)by using the analysis of ultraviolet(UV)spectroscopy combinedwith partial least squares(PLS),This metho...A simple and novel method has been proposed to determine the enantiomeric composition ofracemate praziquantel(PzQ)by using the analysis of ultraviolet(UV)spectroscopy combinedwith partial least squares(PLS),This method does not rely on the use of expensive carbohydratessuch as cyclodextrins,but on the use of inexpensive sucrose,which is equally effective as car-bohydrate.PZQ has two enantiomers.Through measuring the slight diference in the UV spectralabsorption of PzQ due to different interactions between its two enantiomers and sucrose,theenantiomeric composition was determined by a quantitative model based on PLS analysis.Themodel showed that the correlation coeficients of calibration set and validation set were 0.9971and 0.9972,respectively.The root mean square error of calibration(RMSEC)and the root meansquare error of prediction(RMSEP)were 0.0167 and 0.0129,respectively,Then,the independentdata of PZQ tablets were also used to test how well the quantitative model of PLS predicted theenantiomeric composition,The ratio of S-PZQ in tablet was 0.492,determined by high-perfor-mance liquid chromatography as the reference value,Six solutions of the tablet samples were prepared,and the ratios of S-PZQ in tablet samples in the validation set were predicted by the PLS model.,Theirrelative erors with the reference value were not more than 4%.Therefore,the established model couldbe accurate and employed to predict the enantiomeric compositions of PzQ tablets.展开更多
文摘利用深能级瞬态谱(DLTS)方法研究了阴极射线辐照 GaP 纯绿发光二极管(LED)中的深能级,测量到两个激活能为0.45 eV、0.66 eV 的电子陷阱和一个激活能为0.33 eV 的空穴陷阱。证实了0.66 eV 的电子陷阱和0.33 eV 的空穴陷阱与辐照引起的晶格缺陷有关,同时发现阴极射线辐照引起谱峰加宽。
基金supported by National Natural Science Foundation of China(No.81102504)Key Technologies R&D Program of Shandong Province(No.2016GSF201003)the Scienti¯c Research Foundation for the Returned Overseas Chinese Scholars,State Education Ministry(the 50th Batch).
文摘A simple and novel method has been proposed to determine the enantiomeric composition ofracemate praziquantel(PzQ)by using the analysis of ultraviolet(UV)spectroscopy combinedwith partial least squares(PLS),This method does not rely on the use of expensive carbohydratessuch as cyclodextrins,but on the use of inexpensive sucrose,which is equally effective as car-bohydrate.PZQ has two enantiomers.Through measuring the slight diference in the UV spectralabsorption of PzQ due to different interactions between its two enantiomers and sucrose,theenantiomeric composition was determined by a quantitative model based on PLS analysis.Themodel showed that the correlation coeficients of calibration set and validation set were 0.9971and 0.9972,respectively.The root mean square error of calibration(RMSEC)and the root meansquare error of prediction(RMSEP)were 0.0167 and 0.0129,respectively,Then,the independentdata of PZQ tablets were also used to test how well the quantitative model of PLS predicted theenantiomeric composition,The ratio of S-PZQ in tablet was 0.492,determined by high-perfor-mance liquid chromatography as the reference value,Six solutions of the tablet samples were prepared,and the ratios of S-PZQ in tablet samples in the validation set were predicted by the PLS model.,Theirrelative erors with the reference value were not more than 4%.Therefore,the established model couldbe accurate and employed to predict the enantiomeric compositions of PzQ tablets.
