[Objectives] To analyze the volatile components in different parts of Polygala japonica Houtt. and compare the differences of these volatile components. [Methods] The volatile components in different parts of P. japon...[Objectives] To analyze the volatile components in different parts of Polygala japonica Houtt. and compare the differences of these volatile components. [Methods] The volatile components in different parts of P. japonica Houtt. were analyzed by the headspace solid-phase microextraction( HS-SPME) combined with GC-MS,and the relative percentage of each component was determined by peak area normalization. [Results] Thirty kinds of volatile components were identified from the leaves and rhizomes of P. japonica Houtt.,mainly including olefins,aromatic hydrocarbons,alkanes and esters. [Conclusions] The volatile components in different parts of P. japonica Houtt. were different,and there may be difference in the medicinal value of volatile components in different parts,thus it is required to take an overall consideration of these differences in the development and utilization of P. japonica Houtt.展开更多
介绍了基于Solid W orks特征造型的特点及分类,并从设计、工艺、加工的角度阐述了特征的定义。对如何提取Solid W orks零件特征的几何信息进行了研究,提出了三种特征提取方法。并以Solid W orks中的零件为例,通过VC++6.0语言设计程序,...介绍了基于Solid W orks特征造型的特点及分类,并从设计、工艺、加工的角度阐述了特征的定义。对如何提取Solid W orks零件特征的几何信息进行了研究,提出了三种特征提取方法。并以Solid W orks中的零件为例,通过VC++6.0语言设计程序,成功地提取了零件特征的几何信息,将之保存在数据库中,为CAPP/CAM系统对数据的利用做好了准备。展开更多
文摘[Objectives] To analyze the volatile components in different parts of Polygala japonica Houtt. and compare the differences of these volatile components. [Methods] The volatile components in different parts of P. japonica Houtt. were analyzed by the headspace solid-phase microextraction( HS-SPME) combined with GC-MS,and the relative percentage of each component was determined by peak area normalization. [Results] Thirty kinds of volatile components were identified from the leaves and rhizomes of P. japonica Houtt.,mainly including olefins,aromatic hydrocarbons,alkanes and esters. [Conclusions] The volatile components in different parts of P. japonica Houtt. were different,and there may be difference in the medicinal value of volatile components in different parts,thus it is required to take an overall consideration of these differences in the development and utilization of P. japonica Houtt.
文摘介绍了基于Solid W orks特征造型的特点及分类,并从设计、工艺、加工的角度阐述了特征的定义。对如何提取Solid W orks零件特征的几何信息进行了研究,提出了三种特征提取方法。并以Solid W orks中的零件为例,通过VC++6.0语言设计程序,成功地提取了零件特征的几何信息,将之保存在数据库中,为CAPP/CAM系统对数据的利用做好了准备。
