主要成分

Based on the financial data of 160 companies in both the stock market of Shanghai and Shenzhen between 2003 and 2005, we first use principle component analysis to eliminate the effect of multiple collinearity while at the same time remain as much information as possible.

本文主要运用主成分分析、多元判别分析和 Logistic 回归分析这三种多元统计分析方法，研究了结合了主成分分析的多元判别模型和Logistic 回归模型在违约概率预测上的应用。

Alkaloids are the main bioactive constituents in Corydalis DC, and only the chemical, pharmacological and bioactive studies have been done about little plants.

结论生物碱成分是紫堇属藏药中的主要活性成分，但其相关的药理作用、生物活性等方面的研究目前仅限于少数植物。

Part of the findings shows the composition of pythoncidere is similar to that of the steam-distilled Cryptomeria japonica essential oil, based upon which an experiment about the Cryptomeria japonica essential oil's effect on animals is conducted. This leads to a further finding that the major element of terpene "limonene"is quite effective to central nervous system, and it can be hypnotic, anxiolytic and analgesic.

该研究还发现芬多精的组成与利用水蒸气蒸馏的柳杉精油的成分相类似，於是进一步以柳杉精油进行动物试验，发现了柳杉中的芬多精及其主要的萜类成分－「柠檬烯」，对动物中枢神经系统有相当大的影响，而且具有安眠、抗焦虑及镇痛的功效。

The main chemical compositions of tea flower were studied. It is the first time to determine the levels of protein, reducing saccharides and SOD activity in different blooming stages of tea flowers collected from three cultivars of Camellia sinensis with different picking time. Results showed that there were significant differences among cultivars and blooming stages, as well as the change of these chemical constituents along with time. Consequently we selected the right cultivar that has high protein, reducing saccharides or SOD activity and the fitting deflower time.

本文研究了茶花中主要化学成分的含量，首次对不同茶树品种、开花状态和采摘时间的茶花中蛋白质、还原糖含量，以及SOD活力进行系统研究，明确了不同茶树品种、不同开花状态茶花中蛋白质、还原糖含量和SOD活力的差异，以及这些化学成分随时间的变化规律，从而筛选出了高蛋白质、还原糖含量，以及高SOD活力的茶树品种和适宜的采花时间。

Transformation process and microstructure in 675 armor steel continuously cooled at a series of different rates were investigated using a high-resolution dilatometer,along with optical and transmission electron microscope.

675装甲钢是一种中碳高强度低合金钢，是在685装甲钢成分基础上加入少量V进行微合金化而得到的，其所含主要合金元素有Ni、Mo、Cr和V，其中Ni、Mo、er主要是强化铁素体和提高淬透性，V主要起沉淀强化和细化晶粒的作用。

In chapter 2, the contents of loureirins in the roots, stems and leaves of Dracaena cochinchinenis were analyzed by HPLC. On the other hand, using the preparation chromatography technology, five compounds were isolated from the leaves of Dracaena cochinchinenis, their structures were identified by means of spectral and chemical methods. They are steroidal saponins.

第二章主要是利用HPLC技术对剑叶龙血树根、茎、叶中龙血素成分的分析与探讨，并利用制备色谱等技术对剑叶龙血树叶子组成成分进行了分析、研究，得到化合物5个，经波谱鉴定，这5个化合物均是幽体皂贰类化合物。

Now we have known that SARS-CoV encoded 11 varietal proteins. They have 4 constitutive proteins: spike protein, membrane protein, envelope protein and nucleocapsid protein. Spike protein trimer form spike and exsertion? virus peplos on the surface. Spike protein is archi-surface antigen component of virus, it has acceptor binding and membrane fusion activity. Spike protein has important effect at tissue tropism, cell-fusion and toxicity. Nucleocapsid protein can bind genome RNA to shape neucleocapsid. Membrane protein and envelope protein are necessary constituent to shape virus peplos. Spike protein is I-type membrane glycoprotein, it mediate virus binding with host cell epimembranal acceptor and to fuse host cell membrane.

SARS-CoV属于巢状病毒目、冠状病毒科，为单正链RNA病毒，基因组全长约29.7kb，已知编码11种蛋白，其中包括4种结构蛋白，分别是刺突蛋白、包膜蛋白、小包膜蛋白和核蛋白或核壳体蛋白。S蛋白三聚体形成突起，伸出包膜表面。S蛋白是病毒的主要表面抗原成分，具有受体结合和膜融合活性，在组织嗜性、细胞融合和毒力等方面起重要作用。N蛋白与基因组RNA结合形成核衣壳。M蛋白和E蛋白是包膜形成所必需的成分。

As one of the main bioactive compositions of the Chinese herbs and perfume plants, farnesol is more and more widely applied in pharmaceuticals, agrochemicals, cosmetics, and domestic chemicals, having good prospects.

金合欢醇是中草药植物的重要活性成分之一，也是一些重要香料植物精油中的主要香料成分之一，因此，在医药、农药、化妆品和日用化工等需要其生物活性的方面已经得到较多应用，并具有较好的前景。

Chemical identification of ODPs from extracts of larval frass,egg masses and midgutThe major ODPs of the extracts from larval frass,egg masses and midguts of O.furnacalis and O. nubilalis fed on an artificial diet were identified by GC and GC-MS.

玉米螟幼虫粪便、卵块及中肠提取液中产卵忌避信息素成分鉴定采用GC和GC-MS方法测定了两种玉米螟取食人工饲料后幼虫粪便、卵块，以及人工饲料和幼虫中肠提取液中的主要化学成分。

This paper mainly through the Fuxin coal refuse areas analysis of the chemical composition of the active ingredient gangue summarize research

本文主要通过对阜新地区煤矸石的化学成分分析，对煤矸石的活性成分进行归纳研究

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。