pressure difference

Formation damages resulted from large test pressure difference include particles migration, formation sand production, retrograde condensation and early water production, and so on.

测试生产压差过大产生的危害包括微粒运移、地层出砂、反凝析、早期出水等。

Flow of gas or liquid due to a pressure difference is called viscous flow.

由于压力差引起的气体或液体流称为滞流.

Bringing quadratic performance index in single neuron and constructing adaptive PID controller, by adjusting gas flow through the second pressure valve, membrane anode side in stack could maintain the ideal pressure difference level with cathode side.

将二次型性能指标引入单神经元自适应PID控制，通过调节二级减压阀的气体流量，可以很好地维持电堆膜阳极侧压力始终与阴极侧压力保持理想的压力差水平。

Results The difference of open pressure method of auditory tube and displacement method of pressure point of tympanic cavity were great, and coincidence rate between those with bad results through two methods above and those through pressure cabin method were respectively 23.4% and 28.0%;

结果咽鼓管开放压力测定法及鼓室压峰点位移法误差均较大，尤其是评定为不良者与气压舱法符合率分别为23.4%、28.0%；

The Parameter Confirmation and Adjustment Process of Pressure difference By pass Control System

差压旁路控制系统的参数确定及调节过程分析

A tapered tube variable area ring orifice device for wet gas measure is developed. It combines a tapered tube, an inner circle-shaped movable baffle, a precision spring and a displacement sensor. Flow equation is given, with distance displacement for pressure difference.

本文提出了一种锥形管变面积环孔装置，用于湿气计量，采用锥形管、内圆形可移动阻流件、精密弹簧和位移传感器组合的结构设计，给出了用位移代替差压的气体流量方程。

Discussion on the Principals of Test Pressure Difference Determination of Natural Gas Reservoir

论天然气藏测试生产压差确定原则

Testing results indicate that the threshold pressure of jet aided drilling is 4.1 times of rock tensile strength and 26% of rock compressive resistance, also related with the bottom hole pressure difference and rock physical properties.

实验结果表明，射流辅助钻井的门限压力是岩石抗拉强度的4.1倍，是抗压强度的26%；还与井底压差及其它岩石物理力学性质有关。

The permeation flux was plotted against the applied pressure difference asas the pure water permeability coefficient.

但随着股的连续使用,在不同电解质溶液中测得的纯水透过系数逐渐减小.

The fluid flow in the fracture is assumed to be linear. The tangential flow rate is proportional to the pressure gradient in the fracture, and the normal flow rate is proportional to the pressure difference between the fracture center and the fracture top/ bottom surface.

流体在裂缝中的流动是线性的，切向流动的速率与缝内压力梯度成正比，法向流动的速率与裂缝中心和裂缝上下表面的压差成正比。

From the calculation of the plate pressure difference of the throttled surge chamber, analyze the numerical value of the influence of the superimposition on it.

并从阻抗式调压室底板压差的计算出发，分析波动叠加对底板压差的影响大小及叠加时间；

The Method of Invariable Pressure Difference Control for the CAT System of the Electrohydraulic Proportional Valve

电液比例阀CAT系统中的恒压降控制方法

Point out that terminal pressure difference control method is more stable than main pipe pressure difference control method.

指出末端压差控制法的水力稳定性整体上优于干管压差控制法。

Based on careful analysis, it is considered that the root causing the complex accident is the pressure difference between the balance pressure needed and the actual water static pressure down hole.

本文通过分析得出，造成大26井井壁坍塌及其后的井下复杂情况的根本原因是起钻所需平衡压力与实钻井底水静压力之间存在压差。

Based on the matrix method, two mathematical models influenced by each extraction steam pressure loss and terminal temperature difference on thermal economy of unit are established.

本文基于矩阵法，分别建立了定流量条件下抽汽压损、加热器端差对机组热经济性影响的数学模型。

Process application of generating big temperature drop via small pressure difference in Yulin gas field

小压差大温降工艺在榆林气田的应用

Aortic transvalvular pressure difference in eight cases with pulmonary stenosis decreased significantly after surgery. Conclusions ( 1) ASO is the ideal surgical method for complete transposition of great arteries and Taussig-Bing heart malformations, its short-term and long-term effects are satisfied.

8例肺动脉狭窄患儿术后主动脉瓣跨瓣压差均有明显下降。结论：（1）ASO是治疗TGA和Taussig-Bing心脏畸形的理想手术方式，近期和远期效果满意。

Meanwhile, the simulation calculation results are analyzed to find out the pressure difference between flash evaporator and condenser under which indicates the power of the constant operation of the desalination system. 2.

同时，利用仿真模型，重点分析计算了不同参数下闪蒸器与冷凝器之间的压差，分析系统持续运作的理论动力。

Air Conditional Pressure Difference Control Design of a Hospital's Operating Room

某医院手术室净化空调压差控制设计

But total pressure loss increases with the increasing of the velocity difference accompanied with the increase of the density and the static temperature ratio.

但速度差随密度比、静温比增大而增大时总压损失亦随之增大。

Calculate the pressure difference by subtracting the desired outlet pressure from the maximum inlet pressure.

通过从最大进口压力减去所需要的出口压力来计算压差.

One of the main methods to test the gas permeability is using partial pressure difference.

用压差法测试塑料薄膜的透气性，是一个长期使用的主流测试方法。

The result showed that the arsenic poisoning patients had got abnormal distal sensation with obvious features of hypalgesia, abatement of temperature sensation with obvious of hypalgesia, abatement of temperature sensation and pressure abatement, which had great difference with the control ( P < 0.05);

结果发现：砷中毒患者末稍感觉异常以痛觉、温度觉、压觉减退最为明显，与其对照对比有显著性差异（P＜0.05%）；

The derived indexes were body mass/ body height index, index of chest circumference ( chest circumference-1/ 2 body height) and blood pressure index ( pulse pressure difference/ systolic pressure × 100).

派生指标：体质量/身高指数、胸围指数（胸围-1/2身高）、血压指数（脉压差/收缩压×100）。

Thermal expansion valve is an important parts in vehicle air conditioning cooling system. It controls the flow rate of the system and maintains pressure difference.

汽车空调热力膨胀阀是汽车空调制冷系统中的重要部件，它控制着系统的流量及维持高低压差，长期以来采用的实验研究方法有许多局限性。

Prediction of the pressure difference for the He II forced flow transfer system

HeⅡ强制流动系统输送压差预测

The precool rate, feeding speed, tank pressure, precool time will be strictly controlled to protect the equipments and technical pipe from being damaged by the large cold shrinkage, high temperature difference, and high stress.

控制预冷速度、进液速度、储罐压力、预冷时间，可防止产生较大的冷收缩和温差应力而损坏设备与工艺管道。

Hydrocarbon reservoir of Chang 8 presents" near-source and favorable facies", pressure difference gradient of resource-reservoir and pore configuration of reservoir control the distribution of oil saturation-resistivity index.

长8油藏具有近源、优相的成藏特点，源储压差梯度和储层孔隙结构控制含油饱和度&电阻增大率大小分布。

Effective prediction of the transfer pressure difference for the He II forced flow system is an important and meaning work before the operation of the real system.

系统输送压力对于He II强制流动输送系统而言至关重要，因此在系统运行之前，实现对其数值的有效预测是一项十分必要而有意义的工作。

When the bore between aortic homograft and artificial blood vessel was 2-4mm, good result could be achieved in clinical hemodynamics and pressure difference was seldom found.

应用人造血管与同种带瓣主动脉连接时，口径应大2～4mm，临床血液动力学效果好，基本无压差。