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turbulent media
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  随机介质
     Applications of a simplified non-Gaussian field model to wave propagation in turbulent media
     一种简化非Gauss场模型在随机介质中光传播问题中的应用
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  “turbulent media”译为未确定词的双语例句
     Under the guideline of the theory to wave propagation in turbulent media which was established by Tartaskii and other Russian scientists in the middle of the latest century, the optical effects of turbulence is considered according to the recent developments in the fields of turbulence and atmospheric turbulence in this paper.
     本文以Tartaskii等前苏联学者于上世纪中叶以来建立的湍流介质中光波传播理论为指导,结合近年来湍流及大气湍流有关方面的研究进展,考虑地球大气湍流运动对在其中传播的光波性质的影响。
短句来源
     An expression of arrival_angle fluctuation spectrum for the collimated light propagating through homogeneous turbulent media is developed, when the effects of filter of lens and the real fluctuation of velocity on measuring the spectrum of the arrival_angle fluctuation is taken into account.
     考虑了接收孔径滤波作用和实际湍流场速度起伏对到达角起伏谱测量的影响 ,理论分析得到了均匀光路情况下到达角起伏谱的表达式 .
短句来源
     To the problems of wave propagation in turbulent media,the essential guideline is always the well-rounded theory established by Tartaskii and other Russian scientists in the middle of the latest century. It is well known that their theory is built on the base of the theory of locally homogeneous isotropic turbulence developed by Kolmogrov in 1941(K41),so the K41 theory is in fact the foundation to the fields of wave propagation in turbulent media.
     对于这类问题的处理,长期以来都是以Tartask ii等人的理论为指导,而他们的理论是根据Kolmogrov于1941年建立的局地均匀各向同性湍流理论(K41)建立的,所以K41理论是这一领域奠基的基石。
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  相似匹配句对
     Media
     媒体
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     MEDIA
     媒体话题
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     turbulent model.
     湍流模型。
短句来源
     Simulation of Premixed Turbulent Combustion in Porous Inert Media Based on FLUENT
     基于FLUENT对惰性多孔介质中湍流预混燃烧的模拟
短句来源
     Applications of a simplified non-Gaussian field model to wave propagation in turbulent media
     一种简化非Gauss场模型在随机介质中光传播问题中的应用
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  turbulent media
Thus, in this paper the results of experimental and theoretical investigations of thermal self-stressing of laser beams in turbulent media were discussed.
      
Thus, a complete solution is derived for the second Rytov approximation for general beam wave propagation through turbulent media, the permittivity fluctuations of which are described by the Kolmogorov-Obukhov spectrum.
      
We analyze particular cases of radio wave scattering in turbulent media with inhomogeneities described by power-law spectra with indices p?2 and p?3.
      
The results can be used to analyze problems of shortwave propagation in highly turbulent media.
      
Method of spectral expansions in problems of optical wave propagation in turbulent media
      
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Effect of noise and detection error is one of three important factors affecting the performances of an adaptive optics (AO) system. In an AO system, noise and detection error can produce errors in the tilt detection of a Hartmann Shack (H S) wavefront sensor and have further effects on the performance of the AO System. A theoretical model of numerically simulating the effects of noise and detection error is presented and a computer program has been compiled, which is combined with our existing program of numerical...

Effect of noise and detection error is one of three important factors affecting the performances of an adaptive optics (AO) system. In an AO system, noise and detection error can produce errors in the tilt detection of a Hartmann Shack (H S) wavefront sensor and have further effects on the performance of the AO System. A theoretical model of numerically simulating the effects of noise and detection error is presented and a computer program has been compiled, which is combined with our existing program of numerical simulation of the laser propagation in turbulent media and an AO system. The effects of detection error, readout noise and photon noise on a practical AO system have been namerically simulated. The results are quite useful for the design of a practical AO system.

噪音和探测误差是影响自适应光学系统性能的三个主要因素之一。噪音和探测误差使哈特曼夏克(Hartmann Shack)波前传感器所测得的倾斜量产生误差 ,进而影响整个自适应光学系统的性能。建立了对噪音和探测误差对哈特曼夏克波前传感器的影响进行数值模拟的理论模型 ,编制了计算程序 ,与已有的激光大气传输与自适应光学系统的计算程序相衔接 ,进行了模拟计算 ,对有限的离散采样、读出噪音和光子噪音的效应作了数值模拟研究。获得了一些对于实际的自适应光学系统的最佳设计有价值的结果

An expression of arrival_angle fluctuation spectrum for the collimated light propagating through homogeneous turbulent media is developed, when the effects of filter of lens and the real fluctuation of velocity on measuring the spectrum of the arrival_angle fluctuation is taken into account. The calculating results are that: high_frequency and low_frequency end of arrival_angle fluctuation spectrum will decay fast when the aperture of lens is small, but they will decay slowly when the aperture is large;...

An expression of arrival_angle fluctuation spectrum for the collimated light propagating through homogeneous turbulent media is developed, when the effects of filter of lens and the real fluctuation of velocity on measuring the spectrum of the arrival_angle fluctuation is taken into account. The calculating results are that: high_frequency and low_frequency end of arrival_angle fluctuation spectrum will decay fast when the aperture of lens is small, but they will decay slowly when the aperture is large; and when fluctuation of velocity is minor, high_frequency end of arrival_angle fluctuation spectrum becomes steeper, while on the contrary, when fluctuation of velocity is strong, high_frequency end of arrival_angle fluctuation spectrum becomes flatter, which is due to the smoothing effect of fluctuation of velocity on arrival_angle fluctuation spectrum. On the current experimental conditions, the theoretical results are confirmed. The experiments are finished in a laboratory turbulence cell. The collimated laser beam with the diameter of 0.1 m passes through the turbulence cell where the diameters of the receiving aperture are 0.1 m, 0.03 m and 0.01 m respectively. The spectrum of the arrival_angle fluctuation will change spontaneously. Data from laboratory simulation of the turbulent cell are in agreement with the theory about small apertures.

考虑了接收孔径滤波作用和实际湍流场速度起伏对到达角起伏谱测量的影响 ,理论分析得到了均匀光路情况下到达角起伏谱的表达式 .计算结果表明 ,当接收孔径较小时 ,到达角起伏谱的高频端和低频端形状都有较大的衰减 ,而接收孔径大时 ,到达角起伏谱的高频端和低频端衰减较小 ;当速度起伏小时 ,到达角起伏谱高频端衰减快 ,反之 ,当速度起伏大时 ,到达角起伏谱高频端衰减慢 .利用湍流池模拟实验 ,让准直激光束通过湍流池 ,当改变接收孔径的大小时 ,测量到到达角起伏谱的变化 ;实验中 ,准直激光束的直径为 0 .1m ,选取的接收孔径直径分别为 0 .1m ,0 .0 3m和 0 .0 1m ,实验数据较好地验证了接收孔径大小对到达角起伏谱测量影响的理论结果

Because of the effects of atmospheric turbulence,the quality of a wave beam will deteriorate seriously when it propagates through the atmosphere.To the problems of wave propagation in turbulent media,the essential guideline is always the well-rounded theory established by Tartaskii and other Russian scientists in the middle of the latest century.It is well known that their theory is built on the base of the theory of locally homogeneous isotropic turbulence developed by Kolmogrov in 1941(K41),so the K41...

Because of the effects of atmospheric turbulence,the quality of a wave beam will deteriorate seriously when it propagates through the atmosphere.To the problems of wave propagation in turbulent media,the essential guideline is always the well-rounded theory established by Tartaskii and other Russian scientists in the middle of the latest century.It is well known that their theory is built on the base of the theory of locally homogeneous isotropic turbulence developed by Kolmogrov in 1941(K41),so the K41 theory is in fact the foundation to the fields of wave propagation in turbulent media.While along with the development of turbulence theory,the flaws of K41 theory were understood gradually,and in these flaws,the irrationally neglect of intermittency is evidently.The intermittency,which is one of the core contents in modern turbulence theory,is widely investigated,and today we have an elementary understand about it.In this paper,we will consider the optical effects of the intermittency of atmospheric turbulence.We first give a thoroughly illustration to the turbulent intermittency and some important theoretic results about it.Then,we study the intermittent effects to light propagation by two methods.In the first method,we study the intermittent effect by a simplified non-Gaussian filed model which can model the atmospheric dielectric permittivity(or refractive-index) fluctuation approximately. In the second method,we explicitly expand the equations of optical statistical moments to the four-order cumulant functions and resolve their solutions.To the second-order moment which is important in optical applications,we analyze it emphatically by the hierarchical structures model.

当光波在大气中传播时,由于大气湍流的作用,其光束质量将会极大地恶化。对于这类问题的处理,长期以来都是以Tartask ii等人的理论为指导,而他们的理论是根据Kolmogrov于1941年建立的局地均匀各向同性湍流理论(K41)建立的,所以K41理论是这一领域奠基的基石。然而,随着湍流研究的深入,人们已经逐渐意识到K41湍流理论的各方面的缺点,其中尤其明显的是,K41理论忽略了湍流的间歇特征。在湍流现代理论中,湍流间歇性的研究一直是处于中心位置。经过数十年的不懈的努力,目前人们已经对湍流间歇性有了一些初步的成果和认识。本文综述了试图将湍流间歇性引入随机介质中光传播问题的考虑之中的各种尝试。我们首先结合光学问题的需要对湍流及其间歇性研究现状及重要成果进行了概要的回顾和说明。在此基础上,我们以两种方式对间歇性大气湍流中光传播问题进行分析:首先,我们以一种简单的非Gauss场模型为基础分析间歇性大气湍流中的光场统计性质;然后,我们将统计矩方程展开到四阶累积函数,分析了近Gauss场附近的光场统计性质。我们还以层次结构模型为基础对二阶统计矩进行了进一步的研究。

 
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