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。
It is used for a wide range of powder material with high density difference (up to 1:2400) with charging coefficient up to 90%.
该设备填充系数大，可达90%以上，对密度差别大、配比悬殊(可达1：24 00)、粒度不等的粉料的混合也同样适用。
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。
Further qualifications require that the two fluids be miscible and that the density difference be a function of differences in temperature.
另外的条件要求两种流体可以掺混起来，并要求两种流体的密度差是温度差。
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。
Later, other researchers measured the density differential and found a significant difference.
后来，其他研究人员测量了密度差，发现了一个显著的差异。
When scientists first analyzed the wood of vintage Cremonese violins in compared with the modern violin wood, they calculated the average density and found no difference.
当科学家们第一次将古典克雷莫纳小提琴的木材与现代小提琴的木材进行对比分析时，他们计算了平均密度，并没有发现区别。
The general point is that the increasing intensity, or thickness, of globalism - the density of networks of interdependence - is not just a difference in degree from the past.
通常的观点是全球主义增长的强度，或密度——相互依赖的网络的密度——不仅是一与过去在程度上的不同。
Nuns who never developed memory problems scored 20 percent higher on idea density than those who became symptomatic, but there was no difference in grammar score between the two groups.
在思想缜密性中，记忆力发达的修女比那些有病症者得分高出百分之二十，但在语法分数中，这两者却没有差别。
The results show that CO2 transfer rate increases with increasing electrical current density and CO2 concentration difference across the membrane.
解的结果表明： 影响CO2传质通量的因素主要有电流密度及CO2在膜两侧的浓度差。
I'm not saying that the iPad's screen is bad, but after owning the iPhone 4 with the Retina Display, you really do notice the difference in pixel density.
我并不是说iPad的屏幕不好，但拥有了配有RetinaDisplay的iPhone4，你就真的会注意到两者像素密度上的不同。
Nutritive ingredients accumulation amounts showed remarked difference under different density and applying nitrogenous fertilizer quantity.
营养物质积累量在不同密度和施氮量下存在较大差异。
The coning of bottom water will happen as soon as the producing pressure drop of a well is higher than the difference of gravity caused by the difference of density between oil and water.
当油井生产形成压力降落大于油水密度差引起的重力差时，砂岩底水油藏锥进即会发生。
The probability density function (PDF) is constructed from the time distributions of signal and backgrounds and the relations among time, time uncertainty, mass, and mass difference variables.
根据信号、本底的时间分布以及时间、时间误差、质量、质量差等变量之间的关系，构建概率密度函数。
Inverted bucket steam trap opening and closing action is based on the difference in density of the condensate and steam to its accurate and reliable.
倒吊桶式蒸汽疏水阀的开启和关闭是根据凝结水和蒸汽的密度差来动作的，其动作准确，可靠。
Difference is bigger because of density, can have being broad use more.
因密度差异较大，还可以有更为广泛的用途。
The continuum equation with conserved volume type was used to avoid divergence because of the big difference in density between gas and liquid.
采用了体积守恒形式的连续性方程，以防止由于气液两相密度差大而引起的数值求解中的不收敛现象。
This engine with regular diesel engine works, and there is not much difference, but with a higher power density.
这台发动机与普通柴油发动机的工作原理并没有太大差异，但拥有更高的功率密度。
This engine with regular diesel engine works, and there is not much difference, but with a higher power density.
这台发动机与普通柴油发动机的工作原理并没有太大差异，但拥有更高的功率密度。
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