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浏览/检索结果: 共7条，第1-7条 帮助 已选(0)清除 条数/页：5101520253035404550556065707580859095100   排序方式：请选择发表日期升序发表日期降序作者升序作者降序提交时间升序提交时间降序题名升序题名降序 Solvability conditions in multi-scale dynamic analysis of one-dimensional structures with non-homogeneous boundaries: A general operator formulation 期刊论文 International Journal of Non-Linear Mechanics, 2019 作者:  Guo, TD;  Rega, G 收藏  |  浏览/下载：40/0  |  提交时间：2019/12/17 Solvability conditions  Non-homogeneous boundaries  Method of multiple time scales  Boundary modulations  Mode correction   Improved Approximation Formulas and Inequalities for the Wallis Ratio 期刊论文 BULLETIN OF THE IRANIAN MATHEMATICAL SOCIETY, 2019, 卷号: 45, 页码: 783-789 作者:  You, Xu;  Chen, Di-Rong 收藏  |  浏览/下载：4/0  |  提交时间：2019/12/30 Wallis ratio  Gamma function  Inequalities  Multiple correction method   Sharp approximation formulas and inequalities for the Wallis ratio by continued fraction 期刊论文 JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS, 2017, 卷号: 455, 页码: 1743-1748 作者:  You, Xu;  Chen, Di-Rong 收藏  |  浏览/下载：10/0  |  提交时间：2019/12/30 Wallis ratio  Gamma function  Inequalities  Multiple-correction method   Improved continued fraction sequence convergent to the Somos' quadratic recurrence constant 期刊论文 JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS, 2016, 卷号: 436, 页码: 513-520 作者:  You, Xu;  Chen, Di-Rong 收藏  |  浏览/下载：6/0  |  提交时间：2019/12/30 Somos' quadratic recurrence constant  Generalized Euler constant  Continued fraction  Multiple-correction method   Some new continued fraction sequence convergent to the Somos quadratic recurrence constant 期刊论文 JOURNAL OF INEQUALITIES AND APPLICATIONS, 2016 作者:  You, Xu;  Huang, Shouyou;  Chen, Di-Rong 收藏  |  浏览/下载：8/0  |  提交时间：2019/12/30 Somos' quadratic recurrence constant  generalized Euler constant  continued fraction  multiple-correction method   Some new sequences that converge to the Ioachimescu constant 期刊论文 JOURNAL OF INEQUALITIES AND APPLICATIONS, 2016, 卷号: 2016, 页码: 148 作者:  You Xu;  Chen DiRong;  Shi Hong 收藏  |  浏览/下载：3/0  |  提交时间：2019/12/30 Ioachimescu constant  multiple-correction method  approximation  rate of convergence   Fast determination of total ginsenosides content in Ginseng powder by near infrared reflectance spectroscopy (EI CONFERENCE) 会议论文 ICO20: Biomedical Optics, August 21, 2005 - August 26, 2005, Changchun, China Chen H.-C.; Chen X.-D.; Lu Y.-J.; Cao Z.-Q. 收藏  |  浏览/下载：18/0  |  提交时间：2013/03/25 Near infrared (NIR) reflectance spectroscopy was used to develop a fast determination method for total ginsenosides in Ginseng (Panax Ginseng) powder. The spectra were analyzed with multiplicative signal correction (MSC) correlation method. The best correlative spectra region with the total ginsenosides content was 1660 nm1880 nm and 2230nm-2380 nm. The NIR calibration models of ginsenosides were built with multiple linear regression (MLR)  principle component regression (PCR) and partial least squares (PLS) regression respectively. The results showed that the calibration model built with PLS combined with MSC and the optimal spectrum region was the best one. The correlation coefficient and the root mean square error of correction validation (RMSEC) of the best calibration model were 0.98 and 0.15% respectively. The optimal spectrum region for calibration was 1204nm-2014nm. The result suggested that using NIR to rapidly determinate the total ginsenosides content in ginseng powder were feasible.