查询词典 sample size

The effects of the ratio of water and the sample, extracting temperature, extracting time, and the sample particle size on water-soluble active ingredients of Ampelopsis grossedentata were investigated with single factor and orthogonal experiments as a measure of total flavones and water extraction ratio.

以水溶性活性成分总黄酮和水浸提率作为衡量浸提效果的评价指标，分别采用单因素和正交实验L9(34)确定了茶水比、浸提温度、浸提时间和样叶粒度对显齿蛇葡萄总黄酮和水浸提率的影响，得出了影响的主次顺序为茶水比、浸提温度、样叶粒度和浸提时间。

The spectrophotometric method examination resultindicated, withdraws sample DNA rate in, OD260/280 value in;Agarose the gelatin electricity swims the examination result to indicate,molecular weight size about 23kb; Withdraws sample DNA may use EcoRIand the HindIII restrictive internally tangent enzyme carries on cuts.

分光光度法检测的结果表明，提取的样品DNA得率在20ug/g-80ug/g之间，OD260/280值在1.9-2.0之间；琼脂糖凝胶电泳检测的结果表明，分子量大小在23kb左右；提取的样品DNA可以用EcoRI和H indIII限制性内切酶进行切割。

This method also allow us to select the most efficient way from the bulk optical systems and available recoding methods, i.e., identifying the space bandwidth product of the input signal, the minimum size of lens apertures, the sample space and total sample number of CCD and spatial light modulator, the need of magnification before the signal passes through a SLM or when the signal reaches the camera.

通过该方法可以确定合适的加密系统和光学器件，例如输入信号的空间带宽积、变换透镜的最小孔径、空间光调制器的分辨率和像素大小、CCD的分辨率和像素大小以及入射到空间光调制器和CCD靶面上光场所需的放大倍数。

Solid-phase extraction technique has become increasingly popular in recent years because it is experienced with several major advantages: the fast, simple and direct sample application in very small size without any sample loss; higher preconcentration factor; rapid phase separation; the ability of combination with different detection techniques in the form of on-line or off-line mode; time and cost saving.

而固相萃取与原子光谱检测技术联用在痕量元素的分离富集和形态分析中也发挥着日益重要的作用。

In this study, we use a sample of 186 firms in Taiwan that have export ratio for at least 10 percent in the sample period to examine their exchange rate exposures and the effect of usage of currency derivatives on currency exposures. In the determinants of exchange rate exposure, we find that exchange rate exposure is positively related to the foreign sales ratio, firm size and quick ratio.

过去相关外汇暴露的文献，主要在讨论国际企业的外汇暴露的大小与其决定因子，受限於企业使用衍生性金融商品交易资料取得不易，过去的模型中通常仅以虚拟变数的方式，来分析公司使用衍生性金融商品避险的影响，而未进一步分析其使用程度对外汇暴露的影响。

The surface morphology was studied by the AFM also.Though the average size of grain and the RMS(root-mean-square) value of the two samples is diffe-rent,comparing sample A with B, the result shows that sample A is more smooth.

通过原子力显微镜，对生长在两种衬底上薄膜的表面形貌做了观察，其晶粒的大小与表面粗糙度有一定的差别，表明二者都是以柱状形式生长的。

The popular method is to approximate the pattern of a sample by multiplying the size of the sample and the pattern of the unit sample.

国际上普遍认为：对不同大小的数据样点，不可能有统一的模板。

By synthetically analysizing the physical and chemical properties of all components and particle size, the content of F2641 in the JOB-iC is determined by gravimetric analysis after F2641 is seperated from HMX,TATB and PNP through ? alkali reflux. Determination conditions is set as follows the sample is boilingly refluxed for six hour in a constant temperature bath after adding lOOm! 8.0 ?? 0.1% NaOH. The solvent DMF saturated by TATB is used for extracting HMX,F21 and PNP from the sample and TATB is seperated by crucible filter G4. The mass precent of TATB is determined by extraction fractionation. The mass percent of PNP is measured by multiwavlength linear regression ultraviolet spectrophotometry. The testing conditions are set as follows:multiwavlength constitution: X=267nxn, 275nm, 283nm, 29mm, 299nm,the application scope of the Lambert-Beer law: the concentration of PNP is O.005?0.O25mgIml, the concentration of HMX is 0.060.3Omg/ml,absorption coefficents of PNP and HMX are solved by the slope of linear regression curve of absorbency- concentration of standard solution of PNP and HMIX for measuring wavelengthes,on the basis of the Lanibert-Beer law and absorbancy additivity principle, the slope of linear regression curve of A/E(1) and E1 of PNP and HMX solution is regarded as the concentration of PNP in the solution.

根据传爆药中各组分的物理、化学性质及主体炸药的粒度大小，进行综合分析，确定了采用碱回流重量法测定JOB-1C 中F_(2641)的含量，测定条件：加入100ml浓度为8.0±0.1％的氢氧化钠，在恒温水浴中煮沸回流6h；采用溶剂萃取法测定JOB-1C中TATB的含量，选择TATB饱和的二甲基甲酰胺为萃取溶剂，用G4坩埚式过虑器进行萃取分离；采用多波长线性回归紫外分光光度法测定JOB-1C中PNP的含量，通过实验确定了多波长组合：λ=267nm，275nm，283nm，291nm，299nm；朗波—比耳定律的适用范围为PNP浓度：0.005～0.025mg/ml，HMX浓度：0.06～0.30mg/ml；在测定波长下，对PNP、HMX标准溶液的吸光度—浓度进行线性回归，由回归曲线的斜率得出PNP、HMX的吸收系数；根据朗波—比耳定律和吸光度加和性原理，在测定波长下，对PNP、HMX 两组分混合溶液A_i/E_HMX(i与E_PNP(i/E_HMX(i进行线性回归，回归曲线的斜率即为混合溶液中PNP的浓度。

The different proportion of high fineness lime stone, GGBS powder and fly ash was added into P-I 42.5R Portland cement to prepared several samples by orthogonal experiment design, the particle size distribution of sample was obtained by RRSB linear regress and the physical performance of the sample was tested.

按正交试验方法设计了不同比例高细石灰石粉、矿渣粉和粉煤灰掺入到P·I42.5R硅酸盐水泥中的多组样品，使用RRSB线性回归得到样品的颗粒群分布，并检验样品的物理性能：结果表明，高细石灰石粉和矿渣粉可以明显改善水泥的粒度分布，增加水泥细微颗粒含量，显著提高水泥早期、后期和长期强度。

Three-factor Jensen model reveals that 82% of all the funds have positive alphas and half of these alphas are statistically significant. And also, the average of the sample funds' alphas and the alpha of the equal-weighted fund are both positive and statistically significant. These illustrate that the sample funds have excellent performance when size and style factors are considered.(4) The study shows that Chinese funds as a whole do not exhibit excellent skills for stock selection and market timing.

在三因素模型下，有82％的基金的詹森阿尔法大于零，正值詹森指数中的一半具有统计显著性，样本基金詹森指数均值及等权基金的詹森指数均为正值，且具有统计显著性，说明在考虑了规模和价值因素的影响后，样本基金表现优异；（4）对基金选股与择时能力的实证分析表明，中国基金在整体上没有显示出良好的预测市场走势的能力，也未显示出优异的选股能力。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。