Betulin(BE)can be obtained from many plants,such as those belonging Betulaceae family,and pharmacological investigations showed its notable biological properties and good potential for food and pharmaceutical developm...Betulin(BE)can be obtained from many plants,such as those belonging Betulaceae family,and pharmacological investigations showed its notable biological properties and good potential for food and pharmaceutical development.We investigated the homogeneity,stability,purity,and uncertainty of a newly certified reference material(CRM)of BE.The certified purity value for the CRM of BE was 99.56%with an extended uncertainty of 0.07%(k=2,P=0.95),as determined by differential scanning calorimetry(DSC).In this study,DSC was used for the first time for purity determination of BE.Given its high accuracy,precision,and reproducibility,DSC can be used as an alternative technique for purity determination of CRMs in the pharmaceutical and food industry.展开更多
Calibration coefficients validation is the foundation for ascertaining the sensor performance and carrying out the quantitative application.Based on the analysis of the differences between the calibration and validati...Calibration coefficients validation is the foundation for ascertaining the sensor performance and carrying out the quantitative application.Based on the analysis of the differences between the calibration and validation,two calibration coefficients validation methods were introduced in this paper.Taking the HJ-1A satellite CCD1 camera as an example,the uncertainties of calibration coefficients validation were analyzed.The calibration coefficients validation errors were simulated based on the measured data at an Inner Mongolia test site.The result showed that in the large view angle,the ground directional reflectance variation and the atmospheric path variation were the main error sources in calibration coefficients validation.The ground directional reflectance correction and atmospheric observation angle normalization should be carried out to improve the validation accuracy of calibration coefficients.展开更多
基金supported by National Key R&D Program of China(Grant No.2016YFC1000900)National Science and Technology Major Project of China(Grant Nos.2017ZX09101001003,2018ZX09711001-003-022,2018ZX09711001-010)+1 种基金National Natural Science Foundation of China(NSFC)(Grant No.81703473)CAMS Innovation Fund for Medical Sciences(Grant No.2017-I2M-3-010).
文摘Betulin(BE)can be obtained from many plants,such as those belonging Betulaceae family,and pharmacological investigations showed its notable biological properties and good potential for food and pharmaceutical development.We investigated the homogeneity,stability,purity,and uncertainty of a newly certified reference material(CRM)of BE.The certified purity value for the CRM of BE was 99.56%with an extended uncertainty of 0.07%(k=2,P=0.95),as determined by differential scanning calorimetry(DSC).In this study,DSC was used for the first time for purity determination of BE.Given its high accuracy,precision,and reproducibility,DSC can be used as an alternative technique for purity determination of CRMs in the pharmaceutical and food industry.
基金supported by the International Science and Technology Cooperation Program of China(Grant No.2008DFA21540)the National Hi-Tech Research and Development Program of China(Grant No.2006AA12Z113)+1 种基金the Chinese Defense Advance Research Program of Science and Technologythe Young Talents Filed Special Project of Institute of Remote Sensing and Application of Chinese Academy of Sciences
文摘Calibration coefficients validation is the foundation for ascertaining the sensor performance and carrying out the quantitative application.Based on the analysis of the differences between the calibration and validation,two calibration coefficients validation methods were introduced in this paper.Taking the HJ-1A satellite CCD1 camera as an example,the uncertainties of calibration coefficients validation were analyzed.The calibration coefficients validation errors were simulated based on the measured data at an Inner Mongolia test site.The result showed that in the large view angle,the ground directional reflectance variation and the atmospheric path variation were the main error sources in calibration coefficients validation.The ground directional reflectance correction and atmospheric observation angle normalization should be carried out to improve the validation accuracy of calibration coefficients.
