In view of the composition analysis and identification of ancient glass products, L1 regularization, K-Means cluster analysis, elbow rule and other methods were comprehensively used to build logical regression, cluste...In view of the composition analysis and identification of ancient glass products, L1 regularization, K-Means cluster analysis, elbow rule and other methods were comprehensively used to build logical regression, cluster analysis, hyper-parameter test and other models, and SPSS, Python and other tools were used to obtain the classification rules of glass products under different fluxes, sub classification under different chemical compositions, hyper-parameter K value test and rationality analysis. Research can provide theoretical support for the protection and restoration of ancient glass relics.展开更多
Glass is the precious material evidence of the trade of the early Silk Road. The ancient glass was easily affected by the environmental impact and weathering, and the change of composition ratios affected the correct ...Glass is the precious material evidence of the trade of the early Silk Road. The ancient glass was easily affected by the environmental impact and weathering, and the change of composition ratios affected the correct judgment of its category. In this paper, mathematical models and methods such as Chi-square test, weighted average method, principal component analysis, cluster analysis, binary classification model and grey correlation analysis were used comprehensively to analyze the data of sample glass products combined with their categories. The results showed that the weathered high-potassium glass could be divided into 12, 9, 10 and 27, 7, 22 and so on.展开更多
为充分了解不同产地南方红豆杉〔Taxus wallichiana var.mairei(Lemée et H.Lév.)L.K.Fu et Nan Li〕各家系幼苗生长、光合生理及株高生长节律的差异,以产自江西分宜(FY)、浙江龙泉(LQ)、福建建瓯(JO)和福建明溪(MX)的20个家...为充分了解不同产地南方红豆杉〔Taxus wallichiana var.mairei(Lemée et H.Lév.)L.K.Fu et Nan Li〕各家系幼苗生长、光合生理及株高生长节律的差异,以产自江西分宜(FY)、浙江龙泉(LQ)、福建建瓯(JO)和福建明溪(MX)的20个家系的2年生容器苗为研究对象,对幼苗的株高和地径以及叶片的净光合速率和叶绿素含量进行比较,并对各家系的株高生长进行Logistic拟合回归分析以及拟合曲线参数和株高生长节律参数的计算和分析;在此基础上,分析了不同指标间的相关性并对供试的20个家系进行聚类分析。结果显示:不同产地间南方红豆杉的株高、地径、叶绿素含量和净光合速率均无显著差异,但这些指标在不同家系间均有极显著差异(P<0.01);各家系的株高、地径、净光合速率(Pn)以及叶绿素a(Chla)、叶绿素b(Chlb)和总叶绿素(Chl)含量的最大值较最小值分别高52.99%、29.63%、115.65%、39.81%、30.95%和37.24%。4个产地的株高生长均呈明显的"S型"曲线;各家系的最大生长速率(MGR)、线性生长速率(LGR)、线性生长总量(TLG)和线性生长持续时间(LGD)的最大值较最小值分别高60.00%、61.54%、63.73%和22.73%;从线性生长始期(t1)和线性生长终期(t2)来看,各家系的速生期为5月中旬或下旬至8月上旬。幼苗的株高与MGR、TLG、LGR、地径、Pn、Chlb和Chl等指标均极显著正相关,并与Chla显著正相关,而地径与MGR、TLG、LGR、Pn和Chlb等指标显著正相关,但株高和地径与LGD均无显著相关性。聚类分析结果表明:在欧氏距离10处,供试的20个家系被分成4个类型,其中,第Ⅳ类的6个家系的幼苗生长最佳且生长潜力最高。研究结果表明:不同产地南方红豆杉各家系的遗传变异丰富,且株高和地径生长主要受生长速率的影响;总体来看,家系LQ09、LQ11、FY21、FY26、MX12和MX18的幼苗生长潜力较高,可作为南方红豆杉的优良家系进行推广。展开更多
目的:通过慢性胃炎临床流行病学调查,探讨中医湿证辨证标准研究的思路和多元统计方法。方法:采用DME(design m easurem ent evaluation)设计的方法对慢性胃炎患者进行临床流行病学调查,对慢性胃炎湿证资料进行聚类分析、两次logistic回...目的:通过慢性胃炎临床流行病学调查,探讨中医湿证辨证标准研究的思路和多元统计方法。方法:采用DME(design m easurem ent evaluation)设计的方法对慢性胃炎患者进行临床流行病学调查,对慢性胃炎湿证资料进行聚类分析、两次logistic回归分析,以此筛选出对慢性胃炎湿证辨证有决定意义的主要症状、体征。结果:运用多元统计学方法筛选出了对慢性胃炎湿证诊断有意义的主要症状、体征,为建立其规范化、标准化的证候标准提供参考。结论:多元统计分析可客观地评价各症状在证候中所处的地位和作用,是中医证候诊断标准研究的有效方法,值得深入研究。展开更多
文摘In view of the composition analysis and identification of ancient glass products, L1 regularization, K-Means cluster analysis, elbow rule and other methods were comprehensively used to build logical regression, cluster analysis, hyper-parameter test and other models, and SPSS, Python and other tools were used to obtain the classification rules of glass products under different fluxes, sub classification under different chemical compositions, hyper-parameter K value test and rationality analysis. Research can provide theoretical support for the protection and restoration of ancient glass relics.
文摘Glass is the precious material evidence of the trade of the early Silk Road. The ancient glass was easily affected by the environmental impact and weathering, and the change of composition ratios affected the correct judgment of its category. In this paper, mathematical models and methods such as Chi-square test, weighted average method, principal component analysis, cluster analysis, binary classification model and grey correlation analysis were used comprehensively to analyze the data of sample glass products combined with their categories. The results showed that the weathered high-potassium glass could be divided into 12, 9, 10 and 27, 7, 22 and so on.
文摘为充分了解不同产地南方红豆杉〔Taxus wallichiana var.mairei(Lemée et H.Lév.)L.K.Fu et Nan Li〕各家系幼苗生长、光合生理及株高生长节律的差异,以产自江西分宜(FY)、浙江龙泉(LQ)、福建建瓯(JO)和福建明溪(MX)的20个家系的2年生容器苗为研究对象,对幼苗的株高和地径以及叶片的净光合速率和叶绿素含量进行比较,并对各家系的株高生长进行Logistic拟合回归分析以及拟合曲线参数和株高生长节律参数的计算和分析;在此基础上,分析了不同指标间的相关性并对供试的20个家系进行聚类分析。结果显示:不同产地间南方红豆杉的株高、地径、叶绿素含量和净光合速率均无显著差异,但这些指标在不同家系间均有极显著差异(P<0.01);各家系的株高、地径、净光合速率(Pn)以及叶绿素a(Chla)、叶绿素b(Chlb)和总叶绿素(Chl)含量的最大值较最小值分别高52.99%、29.63%、115.65%、39.81%、30.95%和37.24%。4个产地的株高生长均呈明显的"S型"曲线;各家系的最大生长速率(MGR)、线性生长速率(LGR)、线性生长总量(TLG)和线性生长持续时间(LGD)的最大值较最小值分别高60.00%、61.54%、63.73%和22.73%;从线性生长始期(t1)和线性生长终期(t2)来看,各家系的速生期为5月中旬或下旬至8月上旬。幼苗的株高与MGR、TLG、LGR、地径、Pn、Chlb和Chl等指标均极显著正相关,并与Chla显著正相关,而地径与MGR、TLG、LGR、Pn和Chlb等指标显著正相关,但株高和地径与LGD均无显著相关性。聚类分析结果表明:在欧氏距离10处,供试的20个家系被分成4个类型,其中,第Ⅳ类的6个家系的幼苗生长最佳且生长潜力最高。研究结果表明:不同产地南方红豆杉各家系的遗传变异丰富,且株高和地径生长主要受生长速率的影响;总体来看,家系LQ09、LQ11、FY21、FY26、MX12和MX18的幼苗生长潜力较高,可作为南方红豆杉的优良家系进行推广。
文摘目的:通过慢性胃炎临床流行病学调查,探讨中医湿证辨证标准研究的思路和多元统计方法。方法:采用DME(design m easurem ent evaluation)设计的方法对慢性胃炎患者进行临床流行病学调查,对慢性胃炎湿证资料进行聚类分析、两次logistic回归分析,以此筛选出对慢性胃炎湿证辨证有决定意义的主要症状、体征。结果:运用多元统计学方法筛选出了对慢性胃炎湿证诊断有意义的主要症状、体征,为建立其规范化、标准化的证候标准提供参考。结论:多元统计分析可客观地评价各症状在证候中所处的地位和作用,是中医证候诊断标准研究的有效方法,值得深入研究。
