Methods:Essential oil was extracted from Xinjiang maca by steam distillation, and then was subjected to chemical component analysis by gas chromatography-mass spectrometry(GC-MS).
方法：采用水蒸气蒸馏法和气质联用技术对新疆引种玛咖中的挥发油成分进行分析，并研究提取时间、缓冲液浓度对玛咖挥发油主成分的影响。
Results Principal component analysis of FTIR Spectroscopy exhibited practical value on reflecting the degree of difference in chemical compositions among different species from the same genera.
结果FTIR的主成分分析在反映同属不同种植物化学组成差异程度上具有应用价值。
Methods Chemical pattern recognition was performed on the fruits of Ligustrum lucidum collected from various areas of China by PCA (principal component analysis) method.
方法应用主成分分析法(PCA)对来源于全国不同产地的女贞子进行了化学模式识别研究。
Numerous statistical process monitoring methods based on principal component analysis (PCA) have been developed and applied to various chemical processes for fault detection and identification.
基于主元分析(pca)的统计检测方法已经被广泛应用于各种化工过程的故障检测和识别。
Principal component analysis (PCA) has found wide application in chemical process monitoring and product quality control as a data-driven modeling method.
主元分析(PCA)作为数据驱动的一种统计建模方法，在化工产品质量控制与故障诊断方面得到广泛研究和应用。
Delamination and cause of polycarbonate (PC) thin-wall component were studied by comprehensive analysis methods and chemical stress cracking mechanism of PC delamination was found.
应用综合分析方法研究了聚碳酸酯(PC)薄壁件分层开裂及其起因，发现了分层的化学应力开裂机制。
Direct characterization technologies for chemical analysis of fibers, without a previous separation of the components or component groups from each other, were reviewed.
该文主要介绍在不对纤维组分进行预先分离的条件下，纤维化学特性的表征技术。
Through mechanic analysis, macrofractgraphic analysis and microscopic analysis, it shows that the design of the component and chemical composition meet the requirements.
通过受力分析、宏观断口分析和微观分析表明，零件的设计和化学成分符合要求；
Principal component analysis showed the significant difference in soil fungal community compositions between treatment of sole chemical fertilizer and others.
主成分分析结果表明单施化肥处理的真菌群落组成与其他各处理存在显著差异。
Principal component analysis showed the significant difference in soil fungal community compositions between treatment of sole chemical fertilizer and others.
主成分分析结果表明单施化肥处理的真菌群落组成与其他各处理存在显著差异。
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