查询词典 coefficient of variation

In the study on the fern population structure, we through the analysis of the variation in height structure, leafstalk diameter structure and age structure in various forest communities, found the rule of variation of population, and discussed the reasons of variation of population structure, and explored the suitable habitat of various forest ferns.

在蕨类植物种群结构的研究中，我们通过对不同群落中蕨类植物种群高度结构、叶柄直径结构和年龄结构的研究，发现种群结构变化的规律，找出种群结构变化的原因，探索出各种蕨类植物种群的适生生境。

The result of analysis of maize quality indicates that under enhanced UV-B radiation, there is different influence on the percentage composition of soluble sugar of different varieties, and the tendency and amplitude of content variation of glucose, levulose and sucrose are different. The percentage composition of starch decreases, and lysine and protein increase. The variation tendency and amplitude of the protein with differentsolubility are different. The change of chemical quality in maize seeds is marked, and the effects of UV-B radiation are different with different maize variation.

UV-B增加对玉米品质影响的分析表明：UV-B增加处理下玉米的可溶性糖百分含量的变化不同的王米品种有着不同的表现，且葡萄糖、果糖、蔗糖变化的趋势及幅度也是不同的；淀粉百分含量是降低的；赖氨酸及蛋白质的含量比对照组要高；不同溶性的蛋白质受到影响后其变化趋向及幅度均不相同，玉米籽粒化学品质的变化是显著的；不同的玉米品种受到UV-B增加的影响后，其变化是不同的。

Great differences between them are found in amplitude, and attributed to the strong background wind in troposphere and steady weak wind in lower stratosphere. Steady diurnal variation of temperature appears above 23 km, and the same variation in pressure is found starting from lower altitude, which together suggest a weak diurnal variation in atmosphere density above 23 km, that approximates a constant at each height.

发现风场振幅的变化与统计平均的结果存在较大差异，这归结于当地冬季对流层内强烈变化而低平流层内相对稳定的风场；温度在23 km以上存在稳定的周日变化，气压在更大的范围内存在与温度类似的周日变化，这使得在23 km以上大气密度的周日变化十分微弱，在各个高度上近似为一个常数。

Here optimum'is reflected by theindex to be the smallestBut the controls through such sifting need not be real optimumones,because maybe there are other kind of variation or high order variation throughwhich the index have negative variation and the conditions are satisfied.

这里最优的意思是通过指标泛函最小来表示的但是这样筛选过的控制未必是最优的，因为还可能可以用其他方式的变分或高阶变分等来使约束条件不变而指标泛函的变分为正。

Divergence variation of snow storm indicated that the formation of negative divergent variation in lower-layer predicted the shear convergence and the snow storm generation. Nongeostrophic vorticity and divergence of wind advection contributed to the divergence variation largely.

暴雪切变线的散度变率诊断表明，低层散度负变率带及中心的生成和发展预示着未来时期内切变线辐合区的形成和发展及暴雪天气的发生，其中非地转涡度和风速平流的散度项对散度变率的贡献较大。

The research results show as follows. As plastic deformation increases, the Young's modulus of material continuously changes. This variation law is able to be described using a piecewise linear function .Hardening model and whether the variation is considered or not make great effet on springback prediction. It is proved that the springback prediction result which adopts the elastic-plastic constitutive model based on INLK hardening model and the variation of Young's modulus is considered, is more close to experimental result. After the sheet metal undergoes multiple bending, the corner radius and bending height also affect springback greatly.But the effect trend is different. At the same time, the reliability of springback research using numerical simulation is proved.

研究结果表明：材料弹性模量随塑性变形的变化是不断变化的，该变化规律可用分段线性函数进行描述；强化模型及考虑弹性模量变化与否对回弹预测有很大的影响，基于INLK强化模型和考虑弹性模量变化的弹塑性本构模型对回弹的预测结果与试验最接近；多次弯曲中圆角半径与弯曲高度对板料变形后的回弹有较大影响，但影响趋势不同；证明了数值模拟方法对回弹研究的可靠性。

In chapter 4, some vector mathematical definitions are first given to position tolerance zones; second, the principle of variation geometry is introduced, and the mathematical foundation of automatic generation of a approximate linear equation of tolerance design function by variation geometry is first proven; tangent method and two-point slope method based variation geometry are main studied.

第四章首先对一些位置公差带给出了矢量化的数学定义；然后介绍了变动几何的原理，首次论证了变动几何能产生近似线性公差设计函数的数学依据，并着重研究了基于变动几何的切线法和二点斜率法。

Theradial range of the root-soil ecoboundary was 60μm inside and 40μm outsideof root surface with variation space of 100μm 40μm inside and 20μm outsidewith variation space of 60μm,30μm inside and 90μm outside with variationspace of 120μm and 20μm inside and 10μm outside with variation space of30μm using N、P、K and Mg concentration as a characterization parameterrespectively.

运用电子探针技术对红松幼苗根土生态界面进行定量的点分析，并依据界面中营养元素的浓度梯度对根土生态界面进行刻画，结果表明，以N来刻画，其根土生态界面的范围是从根60μm到土40μm(以根表为分界线，分别向根组织方向和土壤方向测点)，变动空间是100μm；以P刻画的根土生态界面的范围是从根40μm到土20μm，变动空间是60μm；以K刻画的根土生态界面的范围是从根30μm到土90μm，变动空间是120μm；以Mg来刻画，其根土生态界面的范围是从根20μm到土10μm，变动空间为30μm。

The results of 118 REE analyses of Li-F granites from South China and other countries indicate that there are three variation ty pes of REE model curves with the different evolution from early to late stages of Li-F grantie complex or from lower to upper petrofacies of the Li-F granite body, which are (1) decreasing,(2) increasing and (3) saltatory variation types. The first variation type is called positive evolution type, which is the production of crystallization differentiation.

华南和其他国家典型Li-F花岗岩的118个稀土分析研究表明，随Li-F花岗岩由早至晚阶段或自下而上不同岩相演化，稀土模式曲线有三种变化类型：①降低变化，②升高变化，③突然变化等类型。

In order to inhibit the variation and second variation of Trypanosome, a predominant VSG antigenic reservoir has been established by purification VSG from VAT, leading to a better immune protection and overcome immune failure due to antigenic variation.

我们设想提纯全部优势变异体 VSG，建立优势 VSG 抗原库，期望该抗原库能抑制虫体变异或抑制虫体的第二次变异，从而对动物起到较好的免疫保护作用，克服因抗原变异引起的免疫失败。

"Yes, now you can give yourself airs," she said, you have got what you wanted.

"对了，您现在高兴了，"她说道，这是您所期待的。

Then the LORD said to me: Rebel Israel is inwardly more just than traitorous Judah.

上主于是对我说：＂失节的以色列比失信的犹大，更显得正义。