流阻

For confirming the method's efficiency, the turn-off transient mathematical model based on the chopper circuit is developed according to the proposed mathematic model of the turn-off transient current through IGCT, in which the RC-snubbers of IGCT, the stray inductance of chopper circuit and DC-link choke are taken into accounts.

该文建立基于斩波电路的IGCT关断暂态特性的数学模型。该模型充分考虑IGCT阻容吸收回路、线路杂散电感及限流电抗器对IGCT关断暂态过电压的影响。

Power transformer, three-phase transformer, iron core transformer and high, medium and low pressure choke coil are applied in broadcasting and television, electric instruments, telecommunication and numerical control circuitry at present.

各种电源变压器、三相变压器、铁芯变压器。高、中、低压阻流圈，目前已在广播电视、各种电子仪器、无线电通讯和数控电路中应用。

The paper analyzes the going of inSb and the relation between output and magnetic field under constant current prompting.

本文研究了InSb磁阻元件在恒流源激励下的工作情况，讨论了在这种方式下，它的输出与外加磁场的关系。

Finally, based on the optimized configurations,the lift coefficients, drag coefficients and lift-drag ratios were calculated with hundreds of in-flow Mach numbers and angle of attacks.Some interesting phenomena occured and were depicted.

最后，针对得到的优化外形，计算了不同来流马赫数和攻角下的流场并分析了升力系数、阻力系数以及升阻比随马赫数和攻角变化趋势，得到了一些有趣的规律。

But the data analysis is relied on experience and statistics in a certain extent, so sometimes it makes big errors. Daniudi gas field is a low permeable gas field, the pressure buildup slowly. The measured formation static pressure is low and the flow pressure is high, so the calculated unresisted flow is high.

特别是大牛地气田属于低渗透气藏，压力恢复缓慢，所测的地层静压值偏低，求产开井3天以上多数井测取不到稳定的流压，所取流压值偏高，计算的无阻流量均偏高。

Under the condition of different velocity of downstream.flux、waterline and so on, the conclusioti drawn from the experiment 'isthat the ratio of reduced resistance is relevant with the velocity of thedownstream and the jetted gas' the waterline of model and the dashplate.

通过不同来流速度、不同流量以及不同吃水等情况下的试验，结果表明：减阻率与来流速度、气体喷射速度、船模的吃水以及有无压浪板有关。

In order to study the effect of microstructure on the superhydrophobic solid surface for its drag reduction charactertics, micro-ridges grating structures on the basis of K9 glass flat surface were fabricated using femtosecond laser. Experiments were carried out to measure the rheological characterization of 40% glycerin solution on flat and grating structured K9 glass surfaces using AR-G2 rheometer respectively. Both surfaces were modified with trichloro perfluoroocty silane in drying oven.

为了研究超疏水固体表面的微结构对减阻特性的影响，首先利用飞秒激光加工技术在光滑K9玻璃基面上加工出微脊光栅结构，然后将光滑K9玻璃与光栅结构K9玻璃置于干燥箱内进行硅烷化处理，以降低表面自由能，最后用AR-G2流变仪测量两表面的流变特性，试验用流体为体积分数40%的甘油溶液和水。

According to the relationship between the shear rate and the energy dissipation rate,a method for calculating the average shear rate based on the volumetrically average energy dissipation rate is presented.

根据能量耗散率与剪切率的关系，提出了按流体的体积平均能量耗散率计算流体平均剪切率的方法，即可根据流体的密度、平均流速、管道直径、流动的摩擦因子或摩阻压降以及流变参数计算牛顿流体和幂律流体管流的平均剪切率。

While gas proportion is in a certain scope,the drag resistance is aggrandized greatly.

因此在利用掺气减阻时应控制段塞流流型的出现。

Based on the theory of two-phase flow, the mechanism of the condenser s steam resistance which is influenced by the steam velocity field at the condenser s throat outlet was analyzed.

基于两相流的有关理论，分析了凝汽器喉部出口蒸汽流场对凝汽器汽阻影响的机理。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。