When the well reaches a pool, oil usually rises up the well because of its density difference with water beneath it or because of the pressure of expanding gas trapped above it.
当井和一个水池相接时，油通常会从井里上升，因为它与井下的水的密度不同，或者因为停留在它上方的膨胀气体的压力。
A concise relation between the population density difference and the temperature is derived.
导出一个简明的粒子数密度差与温度的关系式。
Under certain conditions, the vertical density difference may induce free convection of the fluids.
在一定的条件下，该密度差可导致流体产生自由对流。
Adopted are such methods as density difference and settlement separation to dehydrate such crude oil.
通过密度差、沉降分离等方法对原油进行脱水。
For effective separation, it is essential that the density difference between the materials to be separated must be big enough.
要进行有效的分选，分选材料之间的比重差别必须足够大。
A gravity current flow of double - diffusive effects has been investigated under the condition of very small density difference.
本文研究了在初始密度差极小的情况下由双扩散效应引起的异重流的流动特性。
The blending volume of negative density difference displacement is much less than that of the positive density difference displacement.
负密度差顶替时掺混量比正密度差顶替小。
Higher order waves generated by a moving source in a two-layer inviscid, incompressible fluid of finite depth with small density difference were studied.
研究了运动点源在无粘、不可压且具有小密度差的两层有限深流体中生成的高阶波动。
If the transport of liquid viscosity and density difference between the larger and water, shall account for the pump parameters: flow, pressure head and shaft power.
若被输送液体的粘度和密度与水相差较大时，应核算泵的特性参数：流量、压头和轴功率。
In this paper, a preliminary experimental study on various flow patterns of a gravity current in two layer system in terms of density difference of fluid layers is presented.
本文对于二层流体环境中的异重流流态与各层流体间的密度差的关系作了初步实验研究。
In the case of large density difference, there is a velocity separation between different media, making the measurement more difficult, cross-correlation method is still usable.
在密度差别较大时，存在着不同介质间的速度分离，给相关法测量带来困难。
Objective To study the cellular nuclear density difference of the hepatic portal vein between the human and pig and provide evidence for pig- to-human liver xenotransplantation.
目的比较研究人与猪肝门静脉细胞核密度间的异同，为猪与人异种肝移植提供理论依据。
Then the incident detection algorithm of urban expressway based on the proposed segment density difference model is proposed, and the logic determining incidents procedure is also provided.
随后在此公式基础上提出基于路段密度差模型的快速路异常事件检测算法，设计了异常事件判断的逻辑流程。
Conclusion: Quantitative parameters of inspiratory and expiratory lung HRCT, especially mean lung density and the density difference changed subsequently with aging in asymptomatic nonsmokers.
结论：无症状非吸烟者随年龄变化，其吸呼气相hrct肺密度定量指标，尤其是呼气相平均肺密度和肺密度差，发生了相应的变化。
Conclusion: Quantitative parameters of inspiratory and expiratory lung HRCT, especially mean lung density and the density difference changed subsequently with aging in asymptomatic nonsmokers.
结论：无症状非吸烟者随年龄变化，其吸呼气相hrct肺密度定量指标，尤其是呼气相平均肺密度和肺密度差，发生了相应的变化。
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