查询词典 vortex

For an irrotational vortex, vorticity is zero everywhere except at the center of the vortex.

对於一个无旋的涡，除了在涡旋的中心，涡度在每一处都是零。

Introduced vorticity by analyzing a rotational vortex and an irrotational vortex.

藉由分析有旋转和无旋转的涡来介绍涡度。

First, UWPBL model(The University of Washington Planetary Boundary Layer Model) is used to retrieve typhoon's sea level pressure from sea surface winds data of SeaWinds which aboard on QuikSCAT and these strength results are analyzed. Then the variational method is applied to decompose the sea surface winds field into two parts: the vortex and irrotational environmental flow field, the UWPBL model is used again to retrieve ShanShan and YaGi typhoons' sea level pressure from the vortex flow field, the results of typhoon's central positions are analyzed by comparing the results with the results of direct retrieving, NCEP's data and typhoon annual reports. It turns out that the accuracy of the typhoon's sea level pressure central position has been obviously improved, This method offers a new idea for the study of typhoon from microwave scatterometer data.

本文首先利用QuikSCAT散射计获取的海面风场资料，利用华盛顿大学行星边界层模式对台风海平面气压场进行反演，并对其强度进行了分析；然后对获取的海面风场，采用变分方法对风场进行分解，分解出无旋和有旋风场，对分解出的有旋风场，再利用UWPBL模式对珊珊和魔羯台风的海平面气压场进行了反演，对所得结果与通常直接反演、NCEP海平面气压场及台风报文资料进行一一对比，结果表明：新的反演定位的方法对台风海平面气压场中心气压的定位精度有了大幅度的提高，此种定位的方法为散射计资料在台风中的实际应用开辟了一条新的思路。

By building the reducers into the meter, the Reducer Vortex can measure lower flows than any other Vortex meter.

通过建立到米的减速，减速旋涡可以比任何其他措施涡米低流动。

It suggests that the vortex migration and crystalling phase vortex nucleation of microscale ore-forming fluid will be the another important way in which some matter in system of metallogenetic kinetics moves and exists.

这暗示，微尺度成矿流体的涡旋运移与晶相涡旋成核可能是地球成矿动力学体系中某些物质运动和存在的又一种重要的形式。

At the location of the south polar vortex for the normal year, the mixing ratios of O3 and CH4 increased, HCl and NO decreased, but NO2 and H2O did not accord with a given rule at all altitudes over Antarctica in 2002, which was related to the change of the vortex and the dynamical transportation after the SSW, and affected by the reduced polar stratospheric clouds and weakened processes of heterogeneous chemistry.

通过比较还发现，在通常年份极涡所处的位置上，2002年O3和CH4的混合比有所增加，HCl和NO的混合比有所减少，而NO2和H2O在不同高度上的变化特点不同。这与爆发性增温之后极涡和动力输送的变化有关，同时由于增温导致极地平流层云中相关冰相反应的减弱也是一个重要的原因。

Vortex folwmeter ; optical-fiber ; light-frequency modulation ; vortex shedder

涡街流量计；光纤；光频率调制；涡街发生体

According to instantaneous velocity fields and vorticity fields measured with SPIV, detailed analysis of the evolution of tip leakage vortex at both design and near stall conditions is presented in this thesis and the different phases of the evolution of the tip leakage vortex, the formation, becoming unstable and the interaction between small-scale vortices and the mainstream can be clearly observed in the experiment results.

SPIV测量结果表明压气机转子叶尖泄漏涡在设计和近失速状态下均存在形成、发展壮大和失稳分裂的演化过程。

It is found that topological charge of vortex beam influences the interference pattern, i.e., by compared with the straight interference pattern of plane wave, the interference pattern of vortex beam is shifted in the transverse direction as we look from the top of the interference to the bottom, and the magnitude and direction of shift are related to the topological charge.

详细介绍了涡旋光束的拓扑荷数对干涉条纹分布的影响。发现同平面波的竖直干涉条纹相比较，涡旋光束的干涉条纹，从顶部向底部看去，沿着横向出现移动，并且移动的大小和方向与拓扑荷数的取值有关。

The simulation is carried out with the excitation frequency relative to the natural vortex-shedding frequency from the corresponding stationary cylinder taking values in the range which stands for sub- and superharmonic excitation and the oscillation dimensionless amplitudes. Change of these parameters and Reynolds number will lead to the mode synchronization and mode competition and the switching between different vortex shedding modes.

对振动频率和静止圆柱旋涡脱落频率比在一定的超谐和亚谐范围、一定的无量纲振幅范围和不同的雷诺数都作了模拟，发现随这些参数变化将产生旋涡脱落模式的同步、竞争和相互转化现象。

In contrast to the ubiquitous rising-sun-with-rays military flag of the Japanese, Chinese banners and ensigns feature a range of designs.

与遍地都是的太阳军旗不同，中国人的旗帜和徽章设计得各式各样。

From their small corner of Feng's Guangzhou headquarters -- a jumble of pink leashes, squeezable rubber steaks, and plastic doggy Santas for Fido's stocking -- Soleil's designers come up with at least five new products a month.

从Feng 设在广州总部的产品展示柜台上可以看到，Soleil的设计师每月至少设计出5件新产品。