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second order diffraction
相关语句
  二阶衍射
     Saturation effect of fiber Bragg gratings can cause the second order diffraction and the decreasing of the first order maximum reflectivity.
     光纤 Bragg光栅的饱和效应可引起二阶衍射 ,并使一阶衍射的峰值反射率下降 .
短句来源
     Using the model of index variation and mode coupling theory,first and second order diffraction spectra of fiber Bragg gratings after saturation are simulated. Bragg wavelength shifts and the changes of maximum reflectivity during the formation of fiber Bragg gratings versus the variation of saturation coefficient are also simulated.
     本文利用折射率变化模型和耦合模理论 ,模拟了饱和情况下 Bragg光栅的一阶和二阶衍射谱 ,并讨论了饱和系数对一阶和二阶衍射的 Bragg波长和峰值反射率的影响 .
短句来源
  二阶绕射
     The Method of an Approximative Calculation of Second Order Diffraction Force on a Vertical Cylinder
     垂直圆柱二阶绕射力的近似计算方法
短句来源
     It is found that the contribution of second order diffraction potential to second order wave forces is important, The effect of water depth and submerged depth on the wave force is also discussed.
     讨论了水深和潜深对波浪力的影响以及二阶绕射势对非线性波浪力的贡献
短句来源
     Two dimensional diffraction problem for multiple horizontal cylinders of the second order Stokes waves is treated in frequency domain based on the boundary element method using simple Green's function in inner water region combined with the eigenfunction expansions in outer water regions. The analytical expression of second order diffraction potential in the outer regions of finite water depth gives a clear physical meaning of wave transmission and reflection characteristic in the far field.
     为了求解二阶Stokes波对多个水平平行柱体垂向绕射问题的频域解,在内场中使用了简单Green函数的边界元方法与外场的特征函数展开式相结合的方法,导出了有限深水域中二维二阶绕射势在外场的解析表达式,对绕射波的远场反射与透射特性给予清晰的物理解释。
短句来源
     By perturbation method the numerical results are provided for the second order diffraction potentials and wave forces on each cylinder.
     利用摄动展开数值求解了流场的二阶绕射势和各个剖面所受的一、二阶波浪力。
短句来源
     The method suggested by reference [1] is used to calculate second order diffraction force on a vertical cylinder in regular waves. It is found that the method is effective when the product of the water depth and the wave number is larger than 2.5 and that the result is instable when the product of water depth and the wave number is less than 2.5, In the latter case we must improve the method to obtain an approximative solution.
     本文用Taylor方法计算规则波中垂直圆柱二阶绕射力,发现该法对于水深与波数的乘积大于2.5时是有效的,其结果是精确的,但当水深与波数的乘积小于2.5时,结果是不稳定的。 因此,须对方法作些改进。
短句来源
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  “second order diffraction”译为未确定词的双语例句
     THE APPLICATION OF SECOND ORDER DIFFRACTION OF A MONOCHROMETER IN LABORATORY EXAFS MEASUREMENT
     实验室EXAFS测量中单色器晶体二级衍射的应用
短句来源
     Significant distortions in measured X-ray absorption fine structure occur when there are impurities' emission lines on the continuum spectra m the investigated energy range. A method for correcting that distortion is proposed. As the EXAFS amplitude decreases, which is caused by the application of second order diffraction of a monochrometer, how to obtain correct structural parameters is also discussed.
     本文研究了实验室EXAFS测量中,应用单色器晶体二级衍射的有关问题,当测定的能量范围内,X射线连续谱上存在杂质发射线时,将导致测定吸收谱精细结构的畸变,研究了对这种谱线畸变进行修正的方法,并对采用晶面二级衍射测定时,EXAFS谱振幅降低的情况下如何求得正确的结构参数进行了讨论。
短句来源
     Second order diffraction is the key to reliable groove geometry results
     二级衍射光检测是决定DVDR光盘沟槽尺寸的关键
短句来源
     The second order diffraction problem of Stokes waves around a vertical circular cylinder in finite water depth is studied by dividing it into four boundary value problems. The solutions satisfying all boundary conditions have been obtained.
     将Stokes波对垂直圆柱体的绕射分成四个边值问题,继而逐一求解,所求的解满足所有方程和边界条件;
短句来源
     The second order diffraction light of Rayleigh scattering light,Raman light,diffused light and the fluorescence diffracted from the grating have been discussed.
     本文讨论了瑞利散射光、拉曼散射光、漫散射光及荧光经光栅衍射而形成的高级次光谱的干扰。
短句来源
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  second order diffraction
At the same time, the radiation conditions of the second order diffraction problems are derived.
      
Without improvements to second-order diffraction analysis, inclusion of model testing as part of final design seems prudent.
      
Until better second-order diffraction methods are developed, final design will continue to rely on physical model testing.
      
The structure at 1542 nm is a second order diffraction of a pump wave at 771 nm.
      
The term in the third curly bracket will only contribute to the second-order diffraction from the population grating.
      
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Non-linear wave forces on fixed or floating offshore structures have attracted much attentions recently. This paper deals with the non-linear effects of regular waves on fixed two-dimensional bodies up to secondorder terms. The second-order diffraction potential is solved consis tently and the second-order steady wave forces and the biharmonic wave forces with frequency corresponding to the double of the incident wave frequency are obtained.By use of the strip theory, this method...

Non-linear wave forces on fixed or floating offshore structures have attracted much attentions recently. This paper deals with the non-linear effects of regular waves on fixed two-dimensional bodies up to secondorder terms. The second-order diffraction potential is solved consis tently and the second-order steady wave forces and the biharmonic wave forces with frequency corresponding to the double of the incident wave frequency are obtained.By use of the strip theory, this method and the results may be used to predict the second-order wave forces on ships or some submersible platforms.

近年来,作用于固定式或浮式海洋结构物上的非线性波浪力正在引起广泛的注意。本文处理了规则波对固定的二维物体的二阶非线性影响,协调地求得了二阶绕射势,并进而得到了二阶定常波浪力和二阶倍频波浪力。 借助于切片理论,此方法和结果似也可用来预估船舶或某些半潜平台的二阶波浪作用力和二阶运动。

Many investigations have been made recently on nonlinear wave diffr-action problems for three-dimensional bodies.However,even for the simp-lest configuration such as single seabed mounted,surface piercing verticalcircular cylinder,it is still worthwhile to investigate into strict solutionfor second-order diffraction potential and corres-ponding second-order wa-ve forces exerted upon cylinders.On the basis of analysing the mechanism of generation of second-or-der diffraction...

Many investigations have been made recently on nonlinear wave diffr-action problems for three-dimensional bodies.However,even for the simp-lest configuration such as single seabed mounted,surface piercing verticalcircular cylinder,it is still worthwhile to investigate into strict solutionfor second-order diffraction potential and corres-ponding second-order wa-ve forces exerted upon cylinders.On the basis of analysing the mechanism of generation of second-or-der diffraction potential,an exact solution is proposed in this paper.Thenonlinear wave forces on a vertical circular cylinder calculated by thepresent method have shown good agreement as compared with experiment-al results.Various effects of components of second-order potential on thenonlinear forces are also discussed in this paper.

三维物体的非线性波浪绕射问题已有不少研究,但即使是对于单根垂直固置于水底且伸出水面的大直径圆柱这样简单的结构物,二阶绕射势与相应的二阶力的严密求解仍存在不少值得进一步探讨之处。本文在分析二阶绕射势产生机理的基础上,提出了二阶绕射势的解析解,从而得到了作用于大直径圆柱上二阶波浪力的协调表达。应用本方法对水平二阶波浪力的数值计算结果与实验结果吻合良好。

The emission spectra of Nd0.9La0.1P5O14 (NLPP) crystal have been measured at 40K(see Fig.1).We found four series emission lines: at-0.9μm due to 4F3/2-4I9/2 transitions of Nd3+ ions, -l.05μm due to 4F3/2-4I1 1/2 transitions, and-1.35μm to 4F3/2-4I1 3/2 transitions.The lines at-1.8μm have been proved to be the second order diffraction of the 4F3/2-4I9/2 transitions, although the lines of 4F3/2-4I1 5/2 might be expected to occur in this region.Fig.2 shows the fine structure of 4F3/2-4I1 1/2 transitions in...

The emission spectra of Nd0.9La0.1P5O14 (NLPP) crystal have been measured at 40K(see Fig.1).We found four series emission lines: at-0.9μm due to 4F3/2-4I9/2 transitions of Nd3+ ions, -l.05μm due to 4F3/2-4I1 1/2 transitions, and-1.35μm to 4F3/2-4I1 3/2 transitions.The lines at-1.8μm have been proved to be the second order diffraction of the 4F3/2-4I9/2 transitions, although the lines of 4F3/2-4I1 5/2 might be expected to occur in this region.Fig.2 shows the fine structure of 4F3/2-4I1 1/2 transitions in NLPP (see Fig.2(b)), compared with the same transitions of Nd3+ in NdP5O14 (Fig.2(a)(c), Ref.[1])and Nd:YAG crystals (Fig.2(d), Ref.[7]).In this way we could identify the each line around 1.05μm with the transitions between the Stark levels of 4F3 2 and 4I1 1/2.The strongest fluorescence line at 1.051μm in NLPP,which can become stimulate radiation at proper conditions, comes from the transition of lower Stark level of 4F3/2 to 4I1 1/2.While in Nd:YAG, the strongest emission line at 1.064μm, which can be transformed to lasering line at above room temperature, comes from the transition of upper Start level of 4F3/2 to 4I1 1/2. This is the major difference of the two lines of Nd3+ in NLPP and Nd:YAG crystals. We therefore measured the temperature dependence of the two lines in a wide temperature range (77-500K), (see Fig.4). For NLPP, the intensities of l,051μm fluorescence decrease monotonicly with the increase of temperature, However for Nd:YAG, the intensities of 1.064μm fluorescence increase with the rise of temperature until 420K, then decrease. we understand this phenomenon in the light of the different transition mechanism of Nd3+ in the two crystals. In NLPP. with the increase of temperature, the population in the lower Stark level of 4F3/2 would bs thermally released to upper Stark level of 4F3/2, resulting in the quenching of the 1.051μm line with temperature,In Nd:YAG, the release of the population in the lower Stark level to upper level of 4F3/2 will enhance the fluorescence between the transition of upper Stark level of 4F3/2 to 4I1 1/2, which is just the 1.064μm emission line.Above 420K, the thermal quenching will start in the upper Stark level of 4F3/2 in Nd:YAG, so the intensities of 1.064μm luminescence turn to decrease. The measurements of the temperature dependence of each line will help us to understand the optical transition processes.

研究了低温下Nd_(0.9) La_(0.1) P_5O_(14)晶体中,Nd~(3+)离子在0.9,1.05,以及1.35μm附近发光光谱的精细结构及相应的跃迁过程,并与Nd:YAG晶体中Nd~(3+)离子发光光谱及相应的跃迁作了比较。在77K-500K的温度变化范围内,研究了Nd~(3+)在两种晶体中最强的发光线的温度依赖关系,发现相反的变化规律,指出这是与两种晶体的结构及跃迁过程有关。

 
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