文章分别采用常规环境激励法与IBIS-FS(Image by Interferometric Survey-Frequency Structures)微波干涉技术两种方法对装配整体式混凝土结构进行动力特性检测,同时按照与现浇结构混凝土相同的方法进行结构理论计算分析。结果表明:实...文章分别采用常规环境激励法与IBIS-FS(Image by Interferometric Survey-Frequency Structures)微波干涉技术两种方法对装配整体式混凝土结构进行动力特性检测,同时按照与现浇结构混凝土相同的方法进行结构理论计算分析。结果表明:实测动力特性结果与计算结果基本符合,常规环境激励法与IBIS-FS微波干涉技术可以在不需要任何激振设备的情况下检测出装配整体式混凝土结构的固有频率、振型、阻尼比;可以根据结构动力特性的测试结果对结构性能进行分析和判断。展开更多
In this study,an ambient mass spectrometry(AMS)based method was developed for rapid detection of organophosphorus pesticides in strawberry.This method combines an electric arc and a microsyringe tip to realize tip-ass...In this study,an ambient mass spectrometry(AMS)based method was developed for rapid detection of organophosphorus pesticides in strawberry.This method combines an electric arc and a microsyringe tip to realize tip-assisted ambient electric arc ionization(TAAEAI).A high-voltage electric arc can be applied to the microsyringe tip to generate an electric field,which results in corona discharge at the microsyringe tip.The juiced strawberry sample loaded on the tip could be directly ionized with TAAEAI and then analyzed by a mass spectrometer.TAAEAI-MS was successfully applied to analyze 6 organophosphorus pesticides in three strawberry samples.Malathion and profenofos were detected from the investigated strawberry samples.This method could quantitatively determine the contents of organophosphorus pesticides in strawberry with high reproducibility,high precision,and high sensitivity.Sample matrices did not interfere with the pesticide analysis.The recoveries of organophosphorus pesticides spiked in strawberry samples varied between 82.6%and 116%with relative standard deviations(RSDs)less than 9.2%.The limits of detection(LODs)varied between 0.0124µg/g and 0.0245µg/g,while the limits of quantification(LOQs)varied between 0.0413µg/g and 0.0817µg/g.The coefficients of determination(R2)of the method were determined to be>0.995.The method established here may have potential application in the detection of organophosphorus pesticides in vegetables and fruits.展开更多
文摘文章分别采用常规环境激励法与IBIS-FS(Image by Interferometric Survey-Frequency Structures)微波干涉技术两种方法对装配整体式混凝土结构进行动力特性检测,同时按照与现浇结构混凝土相同的方法进行结构理论计算分析。结果表明:实测动力特性结果与计算结果基本符合,常规环境激励法与IBIS-FS微波干涉技术可以在不需要任何激振设备的情况下检测出装配整体式混凝土结构的固有频率、振型、阻尼比;可以根据结构动力特性的测试结果对结构性能进行分析和判断。
基金supported by National Natural Science Foundation of China(No.21927810)the Project of Experimental Technology and Management(No.SYJS2020010)the laboratorybased open project in Sichuan Normal University(No.KFSY2020004).
文摘In this study,an ambient mass spectrometry(AMS)based method was developed for rapid detection of organophosphorus pesticides in strawberry.This method combines an electric arc and a microsyringe tip to realize tip-assisted ambient electric arc ionization(TAAEAI).A high-voltage electric arc can be applied to the microsyringe tip to generate an electric field,which results in corona discharge at the microsyringe tip.The juiced strawberry sample loaded on the tip could be directly ionized with TAAEAI and then analyzed by a mass spectrometer.TAAEAI-MS was successfully applied to analyze 6 organophosphorus pesticides in three strawberry samples.Malathion and profenofos were detected from the investigated strawberry samples.This method could quantitatively determine the contents of organophosphorus pesticides in strawberry with high reproducibility,high precision,and high sensitivity.Sample matrices did not interfere with the pesticide analysis.The recoveries of organophosphorus pesticides spiked in strawberry samples varied between 82.6%and 116%with relative standard deviations(RSDs)less than 9.2%.The limits of detection(LODs)varied between 0.0124µg/g and 0.0245µg/g,while the limits of quantification(LOQs)varied between 0.0413µg/g and 0.0817µg/g.The coefficients of determination(R2)of the method were determined to be>0.995.The method established here may have potential application in the detection of organophosphorus pesticides in vegetables and fruits.
