The first principal component

According to the first principal component , the order of economic benefit evaluations about 16 provinces had been given .

运用第一主成分分析，对全国16个省、直辖市的主要工业经济效益进行排序。

We can make the first principal component contribute to 90 % by choosing the suitable kernel function and point product computation only .

通过核技巧，只需在原空间进行点积运算，便可使第一主成分的贡献率达到90%以上，能有效避免PCA中因各指标贡献率过于分散而影响评价效果。

CHD was the first principal component and length factor was the second .

主成分分析表明：垩白因子为第一主成分因子，粒长为第二主成分因子。

The first principal component was positively correlated with the soil moisture content and organic matter , negatively correlated with soil bulk density and total salt .

第一主成分与土壤含水量、有机质呈现正相关，与土壤容重、总盐呈现负相关。

This paper introduces an important Perron-Frobenius theorem in algebra , and discusses the first principal component served as the principle and condition of the system evaluation index .

介绍了代数学中的一个重要定理（Perron-Frobenius定理），论述了第一主成分作为系统评估指数的原理和条件；

The first principal component can denote the degree of soil salinity , and the second and third principal component can denote the degree of soil alkalinity .

第一主成分综合反映了区内土壤盐渍化程度，第二和第三主成分联合反映了土壤的碱性特征。

As a result , the first principal component is regarded as the measure of the scale vocation , and also the second principal component is considered as the measure of efficiency .

提出用第一主成分作为行业规模的度量，第二主成分作为行业效益的度量。

The first principal component ( PC1 ) accounted for 30.2 % of the variance and clearly identified as the influence of terrigenous input of Changjiang River et al . , which changed the nutrients concentration and water transparence .

在提取的5个主成分中，第一主成分的方差贡献率达30.2%，主要反映了长江径流等陆源输入对海区的影响，影响的环境因子主要包括营养盐浓度和水体透光性。

The first principal component mainly reflects the enrichment degree of Cu , Pb , Zn , Ni , Cd , As and Hg , while the second principal component reflects the enrichment information of Cr and Ni and the release information of Hg .

第一主成分主要反映重金属Cu，Pb，Zn，Ni，Cd，As和Hg的富集程度，第二主成分主要反映了重金属Cr和Ni的富集信息量以及Hg的释放信息。

Further principal component analysis shows that elevation and soil water content are the first principal component affecting SOC content , followed by the canopy density of Picea crassifolia forest and shrub biomass , which account for 83.8 % of the variance of SOC content .

经主成分分析表明，海拔和土壤含水量是影响土壤有机碳含量的第一主成分，林木郁闭度是第二主成分，灌木生物量是第三主成分，累计解释率为83·8%。

Principal Curves are nonlinear generalizations of the first linear principal component which can be thought of as ' optimal ' linear 1-d summarization of the data .

主曲线（principalcurves）是第一主成分的非线性推广，第一主成分是对数据集的一维线性最优描述。

Indexes of the first and second principal component can be calculated according to their eigenvectors , so driving factors of each period can be indicated .

根据第一主成分和第二主成分的特征向量计算各时间段的第一主成分和第二主成分的指标值。

The results showed that the first principal component is a factor of seed weight .

结果表明，第一主成分为粒重因子。根据主成分分析，对供试亲本进行初步筛选。

2.5 % span length was the main factor in the first principal component .

3个品种的M5群体的2.5%跨长均为第一主成分的主要因子。

A robust zero-watermark algorithm using the direction stability of the first principal component vector is proposed , which can be used for remote-sensing image and general image .

基于第一主成份向量方向的稳定性，设计了一种适用于遥感图像和普通图像的零水印方案，方案在鲁棒性、经受攻击的广泛性、实用性三方面综合性能优越。

The contribution rate of the first principal component was54 % , which could be used to evaluate the heat-resistant of Black Currants seedlings .

第1主成分贡献率为54%，可用来评价黑穗醋栗幼苗的耐热性。

The results show that the first principal component is strength index and the second principal component is air shrinkage index , the accumulated contribution ratio of the two principal components is 84.3 % .

结果表明，木材物理力学性能的第1主成分为强度指标，第2主成分为干缩指标，这两个主成分的累计贡献率为84.3%。

The results showed that in the first principal component , the contribution of arthropod community , phytophagous sub-community and predacious sub-community was 66.70 % , 73.39 % and 54.17 % , respectively .

结果表明，葡萄园节肢动物群落、植食类亚群落、捕食类亚群落特征向量矩阵中第1主分量综合指标贡献率依次为66·70%、73·39%和54·17%。

The result of principal component analysis showns that the first principal component is the intensity of the supply of nitrogen in the soil to goober . Organic matter , total nitrogen , available nitrogen in both surface and subsurface layers have higher positive loading than other nutrients .

主分量分析结果表明，第一主分量是土壤供氮强度的量度，表层和表下层有机质、全氮、有效氮均对第一主分量有较大的正向负荷量。

When performing k-nearest neighbor search , points can be pruned according to the relationship between the query and the axis determined by the first principal component , and partial distortion searching algorithm can also be used to speed up the query processing .

在κ近邻搜索中，根据查询向量与主分量坐标轴的空间关系对数据点进行过滤，并且采用部分失真搜索算法加速搜索过程。

Results indicated that the speed of wind , CO2 , and noise are chief indexes of the first principal component , the quantity of grain is chief index of the second principal component , and CO is chief index of the third principal component .

结果表明：风速、CO2、噪声是决定第一主成分的主要指标，尘埃颗粒数是决定第二主成分的主要指标，CO是决定第三主成分的主要指标。

The accumulative variance contribution of the first three principal components was 35.7 % . The first principal component encompassed only 20.22 % of the total variation .

主分量分析得到的前三个主分量的累计方差贡献率为35.7%，第一主分量的方差贡献率为20.22%。

The results show temperature spatial variations have high consistency , the variance ratio contribution of the first principal component is about 75 % .

结果表明：祁连山附近气温在空间上具有很好的一致性，年平均气温的第一主成分的方差贡献可占总方差的75%左右。

We mainly carry out more lateral comparison for the 40 blue chips selected , and they have a rank according to the scores of the first principal component to offer reference to masses of investor .

它主要对所选择的40只绩优股，进行横向的比较，并根据第一主成分得分进行排序，给广大的投资者提供参考。

The analysis results of the quality indexes of chronologies , cluster analysis and the weights of the first Principal Component ( PC1 ) indicate that the tree ring-width chronologies at six sites is characterized by the apparent spatial change .

树轮宽度年表的质量指标、聚类分析和PC1权重值分析表明，研究区6个采样点树轮宽度年表有明显的空间变化特征。

Furthermore , dynamic heat-moisture comfortability of fabrics can be predicted according to the basic properties of fabric by utilizing the relationship formula about the basic performance parameters of fabric and the first principal component .

还可以利用织物基本性能参数与第一主成分的关系式通过织物的基本性能预测织物的动态热湿舒适性能。

Stock turnover rate of the reciprocal measure of the degree of adverse selection of investors to measure the agency costs of the enterprise , the first principal component of the rate of turnover and operating expenses .

用股票周转率的倒数衡量投资者的逆向选择程度，用总资产周转率和经营费用率的第一主成分衡量企业的代理成本。

In the Euclidean distance of 3.14.3 , Principal component analysis results show that : the first three principal components of the cumulative variance contribution rate is 53.97 % , the first principal component reflects the fruit size , leaf size , plant size and other quantitative trait .

主分量分析结果显示前三个主成分的累积方差贡献率为53.97%，第一主成分反映的主要是果实大小、叶片的大小、植株的大小等数量性状特征。