比密度

Al-Si活塞合金因其具有较低的比密度，良好的高温性能，较好的耐磨性能，而被广泛应用。

Al-Si piston alloy has been widely used because of its low density , good high strength , good wear resistance .

本文实验发现具有较大密度和较高速度的93W钨合金长杆模拟弹的穿靶深度反而比密度较小，速度较低的90W钨合金长杆弹的穿靶深度小。

It was found in penetration experiments that the penetrating depth of 93W-alloy Long-rod penetrator with higher velocity is lower than that of the lower velocity long-rod penetrator made of 90W-alloy .

得出磁场激发比密度扰动的激发更易发生的结论。

A conclusion that the excitation of magnetic fields is more easier than that of density modification is obtained .

孔隙率大于63%的泡沫铝合金，其与水的比密度小于1，具有轻质性能。

The Al alloy foam with low porosity has a density lower than that of water , which forms its light structure .

估计和评价植被蒸散耗水时，用叶面积指数或叶生长量指标可能比密度更符合生物学逻辑。

The LAI and leaves biomass may be better indicators than density for estimating and evaluating water consumption of vegetation , since it is more biological based .

1997年以后，增长效应比密度效应作用明显，全国工业废水排放量呈现上升趋势，特别是近3年增长显著。

On the contrary , it was increasing after the year 1997 , especially in recent three years , because the increase effect was more obvious than the density effect .

模型的反演计算结果表明，有效密度法得到的深度偏浅，盆地宽度的影响比密度分布的影响大。

The inversion shows that the method of effective density leads to the depth of basin smaller than the actual 's , and the width of basin is more significant than the density contrast in computation .

将形状改变比能密度因子Sd用于建立复合型裂纹的断裂准则。

The deviator strain energy density factor Sd is considered here as a fracture criterion for mixed-mode fracture .

文章利用有限差分程序FLAC，定量化讨论了边坡岩体（软岩）的变形模量、泊松比、密度、粘聚力、内摩擦角、边坡高度等参数对软岩边坡变形的影响。

Using the difference code of FLAC , this paper discussed the relationship between soft rock mass parameters and slope deformation .

试验结果表明，水泥掺入比、密度和龄期，对不固结不排水和固结不排水三轴压缩试验的应力应变特性和抗剪强度指标c，φ的大小有不同程度的影响。

It is indicated that the cement mixing ratio , density and age of the lightweight soil have different influences on the results of stress-strain properties and shear strength indexes of the soil in triaxial compression tests under unconsolidated-undrained and consolidated-undrained conditions .

ASTME662由固体材料产生烟雾的比光密度的测试方法。

ASTM E662 Standard Test Method for Specific Optical Density of Smoke Generated by Solid Materials .

模拟时上地壳被考虑成具有Byerlee型强度包络，并且位于无粘性基底之上，盆地中由密度比地壳密度小的沉积物充填。

The substratum is assumed to be inviscid and the basin is filled by sediments lower in density than the crust .

一般情况下，正常密度与高密度在固井质量良好的条件下，其CBL衰减率比低密度都要高，其套管波首波幅度值都应该比低密度小；

Generally , under conditions of good cement job quality the CBL decay rate of normal density and high density admixture cement is higher than that of low density admixture cement and the head wave amplitude of casing wave is lower .

直接甲醇燃料电池（DMFC）以甲醇为燃料，具有比能量密度高、结构简单、使用方便灵活等特点，在手机、笔记本电脑等可移动电源领域具有广阔的应用前景。

Direct methanol fuel cell ( DMFC ) using liquid methanol as fuel , is promising for portable application such as cell phone , laptop computer and other electronics because of its high energy density , simplicity of structure ( no additional equipment such as fuel reformer ) and maintenance .

形状改变比能密度因子断裂准则

A fracture criterion based on the deviator strain energy density factor

库源比随密度的增加逐渐降低。

The sink-source ratio deceased gradually with the increase of plant density .

基于后验信噪比概率密度分布的先验信噪比估计

A Priori SNR Estimation Based on the Density Distribution of a Posterior SNR

唯一比这密度要大的就是一个黑洞。

A black hole is the only thing denser .

具有较高的压缩比和密度允许更多的权力。

With a higher compression ratio , and allows for more power density .

在相同条件下红球藻高密度体系培养液中的无机氮源要比低密度体系消耗得快；

Than that in relatively low density system s.

由于锂离子电池的比能量密度和比功率密度均为镍镉电池的4倍以上，近年来锂离子电池以年均20%的速度迅速发展。

Lithium ion battery has 4 times specific energy and specific power than Nickel-Cadmium battery .

施加给比自己密度小的物体的向上作用的力。

The upward force that a fluid exerts on an object less dense than itself .

就诱导细胞凋亡而言，激光的功率密度比能量密度更重要。

Power density is more important than energy density so far as laser-inducing apoptosis of scar flbroblasts concerned .

在此基础上构造了求解包含大压力比和密度比的二维界面问题的数值方法。

Based on the GVC scheme , a numerical solver was constructed to simulate two-dimensional interface problems of high pressure and density ratio .

分析讨论了弹性模量比、密度比、晶格常数和管厚等对禁带频率的影响。

The effects on band gaps of density ratio , stiffness ratio , lattice constant , and thickness of pipelines and so on are discussed .

氙灯单位侧面积上的输入功率比电流密度能更好地描述氙灯的工作特性。

The input power per unit wall area is more useful to describe the output spectra of flashlamp than current density which is used by previous studies .

讨论了裂缝长度、裂缝位置、库水位、以及心墙土料的弹性模量、泊松比和密度等对水力劈裂发生可能性的影响。

The influence of crack length and crack position , water level , modulus , Poisson 's ratio and density of core soil on hydraulic fracturing is discussed .

结合理论计算分析了样品壳/芯比、密度及温度等对相变微胶囊导热性能的影响规律。

Based on the theoretical calculations , the influence laws of shell-core rations , density and temperature on the heat conduction performance of phase change microcapsules are analyzed .

影响氢产率的是包含着停留时间、进料浓度、电功率等因素在内的比能密度，比能密度越高，氢产率越高。

It was found that H_2 . yield was increased with the increasing specific energy density , which affected by the residence time , concentration of feed , electrical power , etc.

结果发现，阻尼比、密度比、频率比、水线平衡位置等是影响拉索水线系统振动响应的重要参数。

It shows that the damp compares , the density compares , the frequency compares and the location of the waterline are of vital importance to the vibration of the system .