查询词典 fluctuation

One of the main causes of the noises of the modern jet plane is the strong fluctuation generated by the flows passing by the trading edge of the airfoil and the outlet of jet engine, and the mechanism of generation of noises canoed by the fluctuation has not been clear at present.

现代喷气式飞机的主要噪声源之一是在机翼的尾缘及喷流发动机的出口处，即流体流过尾缘时产生的强烈脉动，目前这类脉动产生噪声的机理尚不清楚。

The underground water level prognosticates:Before the earthquake take place, the fluctuation of rock stratum will squeeze groundwater, make the groundwater rising perhaps descended, so can observe by observing the fluctuation of underground water level.

地下水位观测：在地震发生前，因为岩层的变动，会挤压到地下水，使地下水上升或者下降，所以可以藉由观察地下水位的变动来观察。2。

The real tangential velocity fluctuation indicated that there existed an instability of swirling flow in the cyclone.This instability resulted in the rotation center of the swirling flow deviating from the geometric center of the cyclone,which produced the quasi-periodic oscillation of swirling flow and gave the real tangential velocity fluctuation.

瞬时切向速度的变化反映了旋风分离器内旋转流的不稳定性，这种不稳定性导致了旋风分离器内旋转流的旋转中心与几何中心不重合，旋转中心围绕着几何中心摆动，由此造成了瞬时切向速度随时间的类周期的波动变化。

Milling machine's type are many, for the adaptation processing work piece's size and the weight, milling machine's type includes: Fluctuation bench miller, non-fluctuation bench miller and planer-type milling machine; Includes for the adaptation volume production: Circle work bench miller, double-end surface milling machine and drum wheel milling machine; In order to adapt certain special work piece processing to develop includes: Tool milling machine, slot-milling machine, crank milling machine; Includes for the adaptation processing complex surface: Hydraulic pressure profiling machine, electricity profiling machine, digital process control milling machine and so on.

铣床的类型较多，为适应加工工件的尺寸和重量，铣床的类型有：升降台铣床、无升降台铣床和龙门铣床；为适应批量生产的有：圆工作台铣床、双端面铣床和鼓轮铣床；为适应某些特殊工件加工而发展的有：工具铣床、键槽铣床、曲轴铣床；为适应加工复杂曲面的有：液压仿形铣床、电气仿形铣床、数字程序控制铣床等。

It is the first time to study the fluctuation of quantum well width and the influence of exciton localization, arising from the fluctuation, on exciton recombination.

这是首次从理论上探讨了量子阱阱宽涨落及其所引起的激子定域化对激子复合行为的影响。

In view of the peaked and fat-tailed characteristics of financial return data distribution and its effect of clustering fluctuation and especially the "leverage effect" of fluctuation on VaR estimates and some efficiencies when estimating VaR with various assumptions of return data distribution,a semi-parameter approach based on EGARCH-VaR model is developed.

在综合考虑了金融收益数据分布的尖峰厚尾特征及其波动集群性，尤其是其波动的&杠杆效应&对VaR估计的影响以及各种假定收益率分布在计算风险价值时存在不足的基础上，提出了基于EGARCH-VaR的半参数方法，并且与正态分布和t分布假设下的GARCH模型的VaR计量方法进行比较，通过实证分析，并利用后验测试，表明基于EGARCH-VaR的半参数方法对风险价值的测度优于正态分布和t分布假设下GARCH模型的VaR计量方法。

In view of the peaked and fat-tailed characteristics of financial return data distribution and its effect of clustering fluctuation and especially the "leverage effect" of fluctuation on VaR estimates and some efficiencies when estimating VaR with various assumptions of return data distribution,a semi-parameter approach based on EGARCH-VaR model is developed.

证券风险是指未来证券价格或收益的不确定性或波动性，证券风险管理的基础和核心是对风险的定量分析和评估·国内外研究表明，金融时间序列通常带有一些明显的特性：金融时间序列的收益率分布存在尖峰厚尾性[1]及其波动具有集群性[2]；股票的价格波动还有&杠杆效应&[3]·这些显著

When the receiving aperture is much larger than the scattering disk scale, the aperture-smooth effect is remarkable and the derived variance approximates the result given by weak-fluctuation theory for any zenith; when the receiving aperture is much smaller than the scattering disk scale, the low-pass filter effect of the scattering disk scale is dominating and weak-fluctuation theory is valid only for small zeniths.

散射盘尺度和接收孔径对到达角起伏起平滑作用，当接收孔径远大于散射盘尺度时，由于孔径平滑作用，导出的表达式在任意天顶角都可以近似为弱起伏理论给出的结果；当接收孔径小于散射盘尺度时，散射盘尺度的平滑作用明显，接收孔径的平滑作用相对较小，传统的到达角起伏理论仅在小天顶角是适用的，在大天顶角必须用新导出的方差表达式。

Unsteady numerical simulation and analysis of the flow fluctuation in the Roots blower;2. The characteristics of gas solid jet are researched and the characteristics of gas\|solid jet fluctuation are proved by means of Rescaled Range Analysis.

流化床内颗粒的混合对流化床内颗粒运行以及燃烧有重要的影响，因此，利用图像处理技术在二维流化床试验装置上研究了水煤膏的混合过程，分析了气固两相射流的流动特性，利用R/S分析方法表明了气固两相射流的脉动特性。

It is found that the two kinds of squeezing can be obtained at some conditions.and the interaction between atoms in BEC changes the period of fluctuation of light field and the amplitude of fluctuation of quadrature component.

由于BEC的独特物理性质及存在的广泛应用前景，BEC已成为一个十分活跃的理论和实验研究领域，实验上相继实现了原子激光，分子BEC等一系列重大进展[4~6]。

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。