负压力

SI法和DMM法复合材料的轴向和非轴向压阻特性都在低EG含量时出现负压力系数效应，在高EG含量时出现正压力系数效应（PPcR）。

The axial and lateral piezoresistance characteristic of composites prepared via SI and DMM methods both behaved negative pressure coefficient of resistance ( NPCR ) effect on low EG content and positive pressure coefficient of resistance ( PPCR ) effect on high EG content .

还指出了负压力指数推进剂的其它优点。

Other advantages of the propellent with a negative pressure exponent were also presented .

CB含量高于渗流阈值时，复合材料仅表现电阻负压力系数（NPCR）效应，而几乎不表现电阻正压力系数（PPCR）效应。

In general , above the percolation threshold , resistance exhibits a negative pressure coefficient of resistance ( NPCR ) effect and positive pressure coefficient of resistance ( PPCR ) effect could hardly be observed .

含负压力指数固体推进剂的压力响应函数

Pressure-coupled response function of solid propellants including those with negative pressure-exponents

在液体润滑轴承运转过程中，润滑油膜的负压力区中会出现空泡。

In liquid-lubricated film of a hydrodynamic bearing , cavities may occur in negative-pressure region .

负压力板应该包含一个能够与叶轮抗磨环匹配的可替换400系列不锈钢抗磨环。

The suction plate shall contain a replaceable 400 Series stainless steel wear ring to match the impeller wear ring .

由于水从叶子表面丧失，一个负压力，或张力就得以产生。

As water is lost from the surface of the leaves , a negative pressure , or tension , is created .

正压力空气一般由空压机提供，负压力空气一般由真空泵提供。

Positive pressure air is usually provided by air compressor , and negative pressure air is usually provided by vacuum air pump .

使用多尺度小波变换捕捉管道两端负压力波的到达时刻，有效地检测出了信号的突变，并能够较好地克服由于噪声存在而给定位带来的误差。

The paper makes use of multi-scale wavelet transform to detect the arriving time of the pressure wave to the both ends of the pipeline .

在一定长度的管线两端安装传感器，测量出由于漏油而产生的负压力波，根据负压力波传到两传感器的时间差计算出漏点的位置。

One of the key technologies of the method is to determine the time between suction waves going through the two measuring points of the pipeline .

研究了氧化铝陶芯的脱芯工艺参数对脱芯性能的影响，发现脱芯正压力应该大于3atm才能起作用，负压力脱芯效果更明显；

Effect of leaching parameter on core leach was investigated , core leach pressure must greater than 3 atm , relatively better leachability can be reached by vacuumizing ;

自增流量装置就是利用自激振荡腔室内的负压力，引入环空的流体形成它激振荡，达到自增流量的目的。

The device for self-increasing flow was just utilize the under pressure in the self-exciting oscillation cavity to introduce the annular fluid leading to the external excited oscillation .

同时，本模型还能够成为研究包括负压力指数在内之固体复合推进剂的侵蚀燃烧与燃烧不稳定性研究的基础。

Moreover , the present model lays a fundation for studying the erosive burning and combustion instability of composite solid propellants , including those with negative burning rate pressure-exponent .

介绍了管线泄漏自动监控系统（负压力波定位检测法）的工作原理和管线泄漏自动监控系统的构成。

In the paper we have introduced automatic leak monitoring system ( the power wave location detection law of negative pressure ) including working principle and leak automatic supervisory system form .

结合管道两端接收到负压力波的时间差，采用遗传算法搜索管道内的泄漏点。

Combining with the time difference value of the pressure wave getting to both ends of the pipeline , adopts the Genetic Arithmetic to search the leak site of the pipeline .

弱凝胶沿主流道迅速通过后产生“负压力”区，周围孔隙中的剩余油被吸出并汇入油流。

The gel stream passes through a big channel at high speed and remains behind some " negative pressure " zones which attract the dispersed oil from the pores around into oil stream .

研究了负压力充零算法和质量守恒空穴算法对应力偶流体润滑轴承油膜压力分布及轴承特性参数的影响。

The difference between set zeros algorithm and cavitation algorithm is examined in solving modified Reynolds equation , and the film pressure and characteristics of bearing lubricated with couple stress fluids are calculated .

对于那些既需要正压力空气又需要负压力空气的气动系统，工作时必须同时配备空压机和真空泵两种空气动力源。

So it is necessary to provide both the air compressor and vacuum air pump on the occasion of both positive pressure air and negative pressure air needed by some pneumatic driving devices .

该系统针对华北油田某采油厂输油系统，结合瞬态负压力波法和管道实时传输模型法，有效提高了管道油品泄漏检测的准确性和报警的及时性，减少了报警失误率。

Aiming at the system of Huabei Oil Field , the system combines real time transient modeling method and rarefaction wave method , and achieves highly improved accuracy and large reduction of false alarm rate .

根据呈正、负压力指数燃速特性的固体推进剂的稳态燃烧模型，导出了一个新的压力响应函数公式，它可用来说明燃速压力指数为零、正、负各类推进剂的压力耦合现象。

A new pressure-coupled response function of solid propellants has been theoretically derived by means of a combustion response model basing upon the steady-state burning model of composite solid propellants including those with negative pressure-exponents .

指出了常负压力波波速定位方法的局限性，并采用改进的负压力波定位技术，将管道内的负压力波速公式采用复化辛普森公式进行了改造。

The paper points out the defects of the const pressure wave velocity method and do some improvements on it rebuilding the expressions of the pressure wave velocity in accordance with the Simpson 's rule .

此外，在流动前沿区域和上游区域之间的中部区域会产生负压力区，且管径越细越明显。

In addition , the gradient zone of negative pressure between the zone of flow front and upper zone is found . And the gradient zone becomes more and more obvious with the decrease of pipe diameter .

随着负压力的增大，拱顶垮落高度也不断增大，但增长幅度却逐渐减小，直至趋于垮落极限值1333b1/fk。

With the increasing of negtive pressure , the height of collapse also gets higher constantly . But the range of increasing will get smaller and smaller until to reach the limit value 1.333 b 1 / f k.

设计能精确控制负压力和正压力的真空系统，给出了系统的组成及工作原理，通过对末端压力的测试给出了系统能提供的压力参数，满足微小器件拾取和释放的要求。

Present the consist of the vacuum system and operating principle . Through end pressure testing , the pressure parameter of the vacuum system is given . And that meet the demand of picking up and releasing micro components .

结果表明，严重的血管狭窄使管壁受压，流体出现负压力及高剪切应力，这些正是导致血管塌陷、血管瘤破裂，从而引发中风及其他心脏疾患的重要原因。

The results show that severe stenoses lead to wall compression and critical flow conditions such as negative pressure and high shear stress which may be related to artery collapse and plaque cap rupture which lead directly to heart attack and stroke .

在0度时，出现了明显的正压状况，而在30～60度都出现了明显的负压，其中45度左右时，负压力差最大。

As a result , a minimum pressure drop is reached at an inclination angle of 45 degrees , obvious positive pressure is created at 0 degree while obvious negative pressure is created at 30 - 60 degrees , including a maximum negative pressure differential occurred at about 45 degrees .

东西两部分的水平应力在方向上有明显的不同，洋壳上的东西向应力sx为负（压力为正），而陆壳上则相反。

The horizontal stresses in eastern and western parts are obviously different that the east-westward stress on the oceanic crust xs is negative ( while the pressure is positive ) but on the continental crust is positive .

包含负孔隙压力现象的孔隙压力封闭解。

Pore pressure including negative one caused by dilatation .

正、负性压力情境下教师应对方式的比较研究

A Comparative Study on Coping Styles of Teachers Under Two Kinds of Stress Situations

因子分析获得正性压力三因子和负性压力六因子。

We obtains three factors in the positive stress and six factors in the negative stress from factor analysis .