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Typically service brakes are concerned with dynamic coefficient of friction, or the coefficient of friction measured while the vehicle is moving.

典型工作条件下的刹车与动摩擦因数，即当车辆行驶时测出的摩擦因数有关。

Because of the small difference between the static friction coefficient and the dynamic friction coefficient of DF-5S slide, it avoids the squirming phenomenon in the restarting-up process efficiently and lowers the severe wear in the restarting-up process.

由于DF-5S铜基镶嵌滑块的动静摩擦系数的差值小，有效地避免了启动过程中的蠕动爬行现象的发生，降低了启动过程中的剧烈磨损。

At impacting condition, rigid polyarethane foam, rubber, and MDF concrete exhibited static friction coefficient of 0.29, 0.285, 0.28 - 0.29, and dynamic friction coefficient of 0.25,0.24, 0.23 respectively when running against aluminum lever.

在冲击加载条件下硬质聚氨酯泡沫塑料与铝杆之间的静摩擦系数为0.29，动摩擦系数为0.25；硅橡胶与铝杆之间的静摩擦系数为0.285，动摩擦系数为0.24；MDF水泥与铝合金杆之间的静摩擦系数为0.28～0.29，动摩擦系数约0.23。

By making use of multi-points backward pressure of one dry gas well, this paper introduces how to confirm dynamic friction coefficient of downhole tubing at the exact moment through stable testing material, gives the productivity and the corresponding bottom hole pressure by using productivity equation, calculates wellhead pressure in combination with dynamic friction coefficient of tubing, establishes the correct wellhead outflow performance equation for this well, draws out wellhead outflow performance curve and discusses how wellhead outflow performance equation or wellhead outflow performance curve changes with the decrease of formation pressure or the change of wellhead outflow performance curve.

借助1口干气井的多点回压法试井资料，介绍了如何利用气井稳定试井资料，确定该气井此时此刻井下油管动态摩阻系数；利用产能方程给出产量和对应的井底压力，结合油管动态摩阻系数计算井口压力，建立该井准确的井口流出动态方程并编绘井口流出动态曲线；讨论了随着地层压力递减和井下油管动态摩阻系数变化规律，井口流出动态方程或井口流出动态曲线的变化规律。

At low temperature (700℃), NO〓 emission increases considerably with excess air coefficient, at 800℃ NO〓 emission is almost independent of excess air coefficient, and at 900℃ NO〓 emission is zero indicating that this temperature is the optimal operating temperature.

稀相区出口浓度为零，密相区内NO和NO〓浓度随氧量增加而减少，说明在900℃下，氧量增加促进NH〓(i=0，1，2)对NO〓还原。

There are some characteristics in thermal test and calculation of boi ler burning these fuel s, such as the calculation of excess air coefficient for large content nitrogen. Fuel characteristic coefficient would be negative. Its necessary to convert fr o m heat content into volume content for the gas fuels calculation.

用这种燃料的锅炉，其热力试验和热力计算有若干特点，如高含氮量的气体燃料过量空气系数的算法，气体燃料特性系数出现负值，将给定燃料的热量份额换算成体积份额，试验中多个取样断面等。

The value of the stable friction coefficient is equal to the average value of the friction coefficient of matrix and reinforcement.

在摩擦试验的最初阶段，复合材料的摩擦系数随摩擦的进行而降低，并在一定的摩擦距离以后趋于稳定。

The regression coefficient of any category was divided by the maximum regression coefficient so as to get the score of this category.

将各项指标的回归系数转换为简单分数，相加后得到每一例患者的预后评分。

Generally speaking, according to the GB 10006 (plastic film and slice method for determination of the coefficient of friction) and ASTM D1894 to film on the surface of dynamic and static coefficient of friction for forward and inverse.

凡是给根据GB 10006(塑料薄膜和薄片摩擦系数测定办法)和ASTM D1894来测定薄膜正反暗不天的不静静摩擦系数。

Therefore, the torque required to open the gate valve required torque than the closure of large, in addition, for a pair of contact between the sealing surface, the Non Rising Stem Resilient Seated Gate Valves coefficient of static friction between them than the dynamic friction coefficient, to make them from the static state generate the relative movement is required to exert greater force to overcome the static friction; due to temperature changes, so that the sealing surface pressure between the larger, need to overcome the static friction force also will be bigger, so that when you open the valve on the stem nut on the sometimes increase the torque exerted a lot.

所以，开启闸阀所需的力矩比关闭闸阀所需的力矩大，此外，对于一对互相接触的密封面来说，它们之间的静摩擦系数也比动摩擦系数大，要使它们从静止状态产生相对运动，需施加较大的力以克服静摩擦力；由于温度变化，使密封面间的压力变大，需要克服的静摩擦力也随之变大，从而使开启闸阀时，对阀杆螺母上施加的力矩有时会增大很多。" Moment analysis of valve operation "是由中国闸阀网提供的国际阀门新闻，译文仅供参考。另外，中国闸阀网还提供相关产品搜索：闸阀型号、闸阀价格、闸阀技术、闸阀新闻、闸阀生产商等。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。