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- viscosity density ratio 比密粘度
- The influence of density ratio on the characteristic frequency of coherent structure on the centreline of low Re number free round jet flow has been investigated with Dual PDA. 采用激光粒子动态分析仪研究了低雷诺数时密度比对自由圆射流近喷嘴区轴线相干结构特征频率的影响。
- Cumulative incidence ratio (CIR), incidence density ratio (IDR)and incidence odds ratio(IOR)can be calculated respectively in cohort study according to various study designs. 根据不同的研究设计，在队列研究中可分别估计累积发病率比（CIR）、发病密度比（IDR）和发病比值（IOR）。
- The strain energy density ratio criterion for predicting cracking direction in composite materials is proposed. The Tsai-Hill criterion and Norris criterion of composite materials are extended to predict the cracking direction in compsites. 本文提出预测复合材料中裂纹方向的比应变能密度准则;并将Tsai-Hill与Norris准则扩展来预测复合材料中的开裂方向.
- An investigation was conducted to explore the influence of density ratio and velocity ratio of mainstream/injectant upon the cooling effect of flat plane film using heat-mass transfer analogy. 摘要采用传热传质类比的方法研究主射流密度差和速度比对单排孔平板气膜冷却效率的影响。
- signal-to-noise power density ratio 信噪功率密度比
- carrier to spectral noise density ratio 载波噪声谱密度比
- bit energy-to-noise density ratio 比特能量噪声密度比
- Magnesium composites, possessing high strength to density ratios, stiffness to density ratios, excellent mechanical and physical properties, are ideal materials for defense high-tech fields. 镁合金材料有高的比强度、比刚度,优异的阻尼减震、电磁屏蔽等性能,是高新技术行业的理想材料之一。
- Some liquids, however, do increase in viscosity when heated. 然而有些液体受热时粘度确实增大了。
- Experimental Verification of the Criterion of Strain Energy Density Ratio 比应变能密度准则的实验验证
- The ratio of students to teachers is 35:1. 学生和老师的比率是三十五比一。
- Results Middle dosed and hig h dosed HYQG groups could significantly decreased the whole blood viscosity and plasma viscos ity.in SHR. 结果化瘀清利合剂治疗大、中剂量组均有降低全血粘度和血浆粘度的作用,在降低低切变率血粘度时呈量效关系;
- The density of population in this city is very high. 这个城市的人口密度非常高。
- The ratio of schoolboys to schoolgirls is 2 to 1. 男学生和女学生的比例是2比1。
- The reciprocal of viscosity is known as fluidity. 粘度的反意就是流动性。
- Men outnumber women here in the ratio of three to one. 此地男子数量以三比一超过女子。
- The first or last term of a ratio or a series. 首项，末项比率或数列中第一个或最后一个项
- The unit of kinematic viscosity is the stoke. 运动粘度单位是沲。
- The area had a population density of five people per square mile. 该地区人口密度为每平方英里五人。
