查询词典 coefficient of variation

Significantly genotypic differences and great variations were detected in grain β-amylase activity,β-glucan and protein fraction contents. The largest variation and highest average value of β-amylase activity were found in Hangzhou 2006-2007, while the trend of coefficient of variation was opposite to the mean content of β-glucan over different environments. Hordein content had the highest correlation coefficient with β-amylase activity among four protein fractions.

研究结果表明：籽粒β-淀粉酶活性、β-葡聚糖和蛋白组分含量均存在显著的基因型差异；杭州2006-2007年度种植条件下的β-淀粉酶活性均值和变异幅度最高，且β-淀粉酶活性和β-葡聚糖含量的变异系数和变化趋势恰好相反；4种蛋白质组分中，醇溶蛋白含量与β-淀粉酶活性呈显著正相关。

In this study, based on the Rnl, extinction coefficient k, transition coefficient of canopy layer stomatic resistance K', aerodynamics resistance ra and rc calculated with the data of Rn, LAI, rsi, the daily transpiration variation of Picea purpurea, Larix principisrupprechtii, Hippophae rhamnoides ,Betula platyphylla and Populus cathayana were studied in Datong County, Qinghai Province. Comparing with the practical transpiration variation measured by Li1600 Steady Porometer, the relative error of this model was less than ±15%, and the results were stabilized and tested by precision analysis.

本研究通过对Rn、LAI、rsi的实地观测，确定了林冠截流净辐射、消光系数、冠层阻力转换系数、空气动力学阻力和冠层整体气孔阻力，对青海大通地区紫果云杉、华北落叶松、沙棘、白桦和青杨的日蒸腾过程进行了模拟，与用快速称重法订正的Li1600稳态气孔仪实测蒸腾结果对比，模拟的相对误差在±15%以内；模型敏感性分析发现，温度、LAI以及rsi是决定模拟结果的主要参数，模型对各参数变化反应不敏感。

By using the direct distillation principle, an improved and quick method which can determine the protein content in maize, soybean meal, rapeseed meal, fish meal, wheat bran, formula feed for swine and formula feed for chicken was established. The result of the study on 142 products belonging to 7 kinds of feedstuffs in three laboratories suggested that: the DD method has fine correlation with the National Standard Method. The relative deviation of the two methods was in conform to the National Standard. The coefficient of variation between different laboratoies was lower than 3%, the coefficient of variation within single laboratory was lower than 2%.

利用直接蒸馏法原理，经研究改进而建立的快速测定玉米、豆粕、菜籽饼、鱼粉、麸皮、猪配合饲料、鸡配合饲料蛋白质含量的新方法。3个实验室对7种类型142个饲料产品的研究结果表明，本法与国标法有很好的相关性，两法测定值相对偏差均达到国家标准规定的要求。

In the increase density 0.05, 0.5mgkg-1 scope, the sea cabbage average increase returns-ratio is 85.1%~93.3%, the coefficient of variation is 5.39%~12.05%; The soil average increase returns-ratio is 90.9%~98.5, the coefficient of variation is

在添加浓度0.05、0.5mg·kg-1范围内，甘蓝平均添加回收率为85.1%~93.3%，变异系数为5.39%~12.05%；土壤平均添加回收率为90.9%~98.5，变异系数为

Studies of stability of capacitance for the standard capacitor include temperature coefficient, voltage coefficient and pressure coefficient of capacitance, i.e., the rules of variation of capacitance as a function of temperature, voltage and pressure.

1000kV标准电容器是目前国内研制的电压等级最高的标准电容器，本文在分析国外标准电容器有关资料和多年来积累的研究和制造500kV及以下标准电容器经验的基础上，针对1000kV级标准电容器进行了大量的研究工作，主要内容包括标准电容器的电容稳定性、介质损耗、电场分布的分析与调整、沿面电位分布等研究。

By synthesizing theories of systems engineering, science of talent, talent assessment, performance appraisal and bibliometrics, the author analyzes the qualification structure and performance structure of theachers in military academies and sets up a basic structure and concrete appraisal indicator system of qualifications of technical specialty for teachers in colleges. The author puts forward new appraisal indicators such as "lecuring hours coefficient","republication coefficient","thesis of core journals coefficient" and "citation coefficient". Comparatively complete quantification approaches are invented by the author for working performance of teaching, researching and social service of teachers. Based on this, the author establishes an integrated method to generate the appraisal results. By the application of stadardized processing on the appraisal results and synthetization of weighted indexes, the author solves the addibility and comparability problems of differentiated appraisal results by category or dimensiok, and realizes the amalgamation and comprehensive appraisal of inflexible appraisalresults and flexible appraisal results, and probes into the testification methods of validity, consistency and sensitivity analysis for the indicators system.

综合运用系统工程理论、人才学理论、人才素质测评理论、工作绩效评估理论、文献计量学等原理与方法，分析研究了军校教师的素质结构和绩效结构；建立了高校教师专业技术资格评审条件基本结构和具体评价指标体系，提出了"完成主讲课程课时系数"、"著作重版系数"、"核心期刊论文系数"、"论文被检索引用系数"等若干新的评价指标；提出了比较完整的教师的教学、科研、社会服务等工作业绩的量化方法；以此为基础，建立了评价结果的综合方法，通过对评价结果的标准化处理，运用指标加权综合法，解决了不同类别、不同量纲指标的评价结果的可加性和可比较性问题，实现了硬评价结果和软评价结果的融合和综合评价；探讨了指标体系有效性、一致性、灵敏度分析的检验方法。

The angular distribution of the bistaticscattering coefficient of HH polarization were obtained by numerical implementation. Influences of the permittivity and the mean layer thickness of intermediate medium, friction velocity and the frequency of the incident wave on the bistatic scattering coefficient were discussed. The basic characteristics, the zonal characteristics and the characteristics with varying of frequency of the scattering coefficient from stratified sea surface were obtained. The numerical results show that the scattering coefficient has approximate "quantization" characteristics.

通过数值计算得到了HH 极化双站散射系数随散射角的变化曲线，讨论了中间介质介电常数和厚度、摩擦风速和入射波频率对双站散射系数的影响，得到改进的一维分形分层海面散射系数的基本特征、分区特征和随频率变化的特征，结果表明散射系数近似具有"量子化"特征。

This study is to give a solution for the estimation of flash point for mixtures, the necessity for classification of flammable liquids. The traditional models for predicting flash point of mixtures usually by the activity coefficient approach. However, the parameters of activity coefficient were regressed from phase equilibrium data in the literatures. If there is no such parameter in literatures for the desired mixture, the model cannot predict the flash point oft hat mixture. Thus, this research aims at the improvement of deficiency of the flash point prediction models in the literatures by useing UNIFAC (Universal Quasi-chemical Functional Group Activity Coefficient) equation, Dortmund-UNIFAC equation and Lyngby-UNIFAC equation. In this study, we were aim at the prediction model for miscible mixtures.From the result, it is suggested to use different type of UNIFAC equation to estimast activivity coefficient in the predition of flash point for different mixture type.

易燃液体分类的主要依据参数为闪火点值，因此本研究目的为解决易燃液体中混合物分类时所面临到的闪火点值缺乏的问题，而在过去文献中所提出的闪火点预测模式会使用到活性系数，但这些模式使用到的活性系数均需要相平衡的数据以回归其所需参数，若所欲估算闪火点的混合溶液文献上未有相关参数，则无法有效利用闪火点预测模式估算其闪火点，因此针对文献中现有闪火点预测模式的缺点，利用描述液体混合物活性系数UNIFAC (Universal Quasi-chemical Functional Group Activity Coefficient)方程式、Dortmund-UNIFAC方程式和 Lyngby-UNIFAC方程式，建立发展一闪火点预测模式，而本研究以互溶溶液为对象。

The results indicate that as the value of fractal dimension is increased, the interfacial static friction coefficient first increases and then decreases; the interfacial static friction coefficient decreases as the fractal roughness parameter increases; while the inter-facial static friction coefficient increases as the material property or total normal load increases; the curve of static friction coefficient versus dimensionless total normal load is convex when the fractal dimension becomes smaller or fractal roughness parameter is larger or material property becomes smaller.

研究结果表明：界面的静摩擦因数首先随分形维数的增加而增加，然后随分形维数的增加而减小；界面的静摩擦因数随分形粗糙度参数的增加而减小，但随材料特性的增加而增加，也随总法向载荷的增加而增加；当分形维数较小或分形粗糙度参数较大或材料特性较小时，静摩擦因数－量纲一的总法向载荷曲线为凸弧。

Diopside crystals in fluosilicate glass-ceramics tend to lower thermal expansion coefficient, while richterite crystals in fluosilicate glass-ceramics tend to increase thermal expansion coefficient.The lowest thermal edpansion coefficient of K2O-MgO-SiO2-CaF2 fluosilicate glass-ceramics is 78.4×10-7(20-300℃), while the highest thermal expansion coefficient of this glass-ceramics is 85.6×

透辉石结晶相的含量增加使微晶玻璃的热膨胀系数降低，与此相反碱镁闪石结晶相的含量增加却使微晶玻璃的膨胀系数增加。K2O－MgO－SiO2－CaF2系统氟硅酸盐微晶玻璃的最小热膨胀系数为：78.4×10－7（20～300℃）；最大热膨胀系数为：85.6×10-7（20～300℃）。

In the days of sailing vessels the crew were afraid they would be becalmed on the ocean.

在使用帆船的时代，船员们担心他们会因为无风而无法在海洋上航行。

As long as foreign donors pay the PA's salary bill, few expect a new intifada.

只要外国继续为巴权力机构的薪水买单，希望发动新暴动的人便寥寥无几。