平衡压力

To follow the force-momentum law, the relation of calculated pressure gradient (i.e., pressure force) balanced with the inertia of fluid is also checked.

依照外力平衡的观点，检验压力梯度与流体惯性力之平衡关系。

A pressure compensator equalizes lubricant pressure to the exterior of the bit.

压力补偿器使润滑油压力与钻头外部的压力平衡。

According to different flows, the pressure balance spool valve can be pre-pressure, can also be a back pressure valve (external to the center of the flow).

根据流向不同，平衡阀芯所受的压力可以是阀前压力，也可以是阀后压力。

Because the beer keg and the bottle are initially under the same amount of CO2 pressure, this "equilibrium" or equalized pressures in both bottle and keg will prevent beer from flowing into the bottle, unless we first bleed off some of the pressure from the bottle by way of a valve.

由于桶和啤酒瓶是根据二氧化碳的压力相同数量最初，这种&平衡&或中瓶和桶均衡的压力将阻止人们把啤酒瓶流入，除非我们首先出血起飞从瓶子的压力通过一个阀门的方式。

Based on the principle of phase equilibrium of fluid, a new model for calculation of pressure distribution in gas condensate well was established in consideration of the effects between temperature and pressure and the effect lead by the change of kinetic energy. The deviation factor is also considered as a function of temperature and pressure in the model.

在流体相平衡理论基础上，综合考虑压力、温度的相互影响及动能变化的影响，同时將流体偏差係数考虑为压力和温度的函数，建立了新的凝析气井井筒压力分佈计算模型。

A computation model of pressure distribution in CO2 gas well is established according to energy balance equation of vertical pipe flow with consideration of the interaction between temperature and pressure, and regarding fluid deviation factor as a function of temperature and pressure.

根据垂直管流的能量平衡方程，综合考虑压力、温度的相互影响，同时将流体偏差系数考虑为压力和温度的函数，建立了二氧化碳气井井筒压力分布计算模型。

The simulation results of the cylinder-block model were given in the article, consistent with that of Middlemen"s. It was shown that the block part could improve the uniformity of the flow distribution. The analysis of the flow field of some materials with different power-law factor in the die designed by Mckelvey was close to that of Mckelvey"s. It was shown that the flow distribution was uniform in the die that can producesheets with 1200mm in width. During the analysis the flow channel was divided into several parts to get the details about the fluid flow in each area. A conclusion was drawn after analyzing the influence of the die pressure on the flow distribution, that the higher pressure is good for the output and bad for the uniformity of the distribution. Simulation of the die applying the cylindrical main runner showed the fact that when the cylinder replaced the cone the change of uniformity was trivial. The uniformity of the non-block flow channel was so poor that the block in the proper position of the die channel was necessary. The project of the die for the wider sheet was put forth, and the analysis of the fluid flow in the die was shown.

本文模拟了圆柱管缝隙流模型的三维流动场，得到了与Middlemen结论一致的流动均匀性，并通过模拟直观地展示了采用阻尼块可以改善挤出均匀性的现象；分析了多种幂率指数的流体在Mckelvey等人设计的流道模型中的流动分布，得到了与Mckelvey的分析结果接近的压力降和流量偏差；本文建立了1200mm幅宽机头流道的三维有限元模型，并逐个分析各个区域和多个截面的流动分布状况，由此揭示了1200mm幅宽L-型机头流道内的流北京化工大学硕士学位论文动分布基本均匀，并在分析了机头压力对于挤出流动分布的影响后得出结论：较高的机头压力可以获得较大的产量，但是不利于物料均匀分布；模拟了采用圆柱管主流道时机头流道内的流动分布，得出结论：主流道由圆锥管改为圆柱管时对流动均匀性影响不大，通过设置适当的阻尼仍然可以达到挤出平衡；模拟了两端进料式圆柱管无阻尼流道的流动均匀性后得到结论：两端进料式无阻尼结构的流动均匀性较差，宽机头中仍然有必要设置阻尼块；确定宽幅机头流道的基本方案，并设计了一种宽幅防水卷材挤出机头流道的结构，通过流动模拟表明该种结构的流动均匀性较好；考察了宽幅机头对于不同厚度片材的挤出适应性，得到结论：当生产不同厚度的片材时，阻尼块高度需要调整。

Pressure governor valve is the use of a spring-loaded power and pressure balance theory, when the spring-loaded pressure less than atmospheric pressure and the valves closed when the pressure is greater than the spring-loaded rubber tubing stretch when the bottom of compressed air diaphragm, diaphragm the effort to promote diaphragm upward and left vavle seat blow the air flow of gas, this would piston shirking role in the pressure mobile, Selection will be emissions from valve seat, air compressors made by the then air into the gas valves and exhaust emissions is through the mouth into atmospheric air compressors idling.

调压阀的原理是利用了弹簧力与压力相平衡的原理，当弹簧的压力小于气压的时候阀关闭，当压力大于弹簧的弹力时候橡胶调压膜片下方的压缩空气对膜片的用途力，推动膜片向上拱曲离开阀座而使空气流入气腔，此时卸荷活塞在气压用途下移动，将排放阀门推离阀座，于是由空气压缩机充入气腔的空气便通过排放阀和排气口排入大气空气压缩机空转。

When the external control pressure increases to the shutoff pressure setting point of the valve, the external control pressure acting on the underside of the diaphragm, which breaks the balance of the compression of the pressure spring and the latch lever, triggers the latch and disengages valve disc arm from the latch.

当外接控制感应压力﹝即减压下游压力﹞升到此阀关断压设定点时，控制压作用于皮膜下层破坏压力弹簧压缩与闩杆间的平衡，然后扳开闩扣并从闩扣释放阀门封盘。

At initial time the core is saturated by oil or water,and put the core into a sample holder with two pressure transducers at ends;Then make the core in a high pressure condition and shut-in the ends of holder;After the pressure of core is steady,open one end of holder to one certain pressure,in the same time, measure the pressurd of sealed end,until attain to another balance state.

设计实验方法为：初始时刻，将岩心在高压下饱和原油，在一端封闭，并装入测压计，待系统压力平衡且稳定后，将岩心另一端放空至某一压力值，连续测量封闭端压力变化，直至系统达到稳定状态。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。