查询词典 Bosworth Field

This problem is also important and valuable in Nonlinear Optics. It will be very helpful to understand how the aberrations affect the course of three- wave mixing, such as the change of conversion efficiency, the distribution of intensity and phase.Small signal solution of aberrated second harmonic generation is deduced from three-dimension three wave coupling functions. The numerical work gives out lot of results of different aberrations. The effects of the fundamental waves aberrations, which will change the conversion efficiency, distribution of intensity and phase in the frequency conversion, is analyzed. It shows that when walk-off and diffraction effects could be ignored approximately estimation of the phase distribution of second-harmonic wave could be done. The far field divergent angle and second moment radius of harmonic wave will vary with the aberration of fundamental wave, but the far field divergent angle will be obviously smaller than that of fundamental wave. The phase distribution of both fundamental and harmonic wave is measured using Hartmann-Shack wave front sensor in the experiment with 1064nm and 790nm lasers, respectively. Results are given.

首次从三维三波相互作用方程组推导得到了位相畸变光束倍频的小信号解；通过建立国防科学技术人学研究生院学位论文三维数值模型，编写相应仿真程序，首次得到了位相畸变光束倍频过程的大量计算结果，深入细致地研究了位相畸变光束经非线性光学频率变换后谐波的转换效率、光强分布、位相分布以及影响它们的各种因素；得出谐波的远场发散角和光斑二阶矩的变化规律会因为基波像差的不同而不同，但谐波的远场发散角明显地比相应基波的小的结论；得到了在走离效应和衍射效应等影响许多因素可以忽略的情况下，位相畸变传递到二次谐波的估算式；举例分析了KDP三倍频方案中，基波位相畸变对二次谐波和三次谐波的影响；实验工作中，用哈特曼一夏克传感器分别对IO64nm倍频过程和790飞秒超短脉冲倍频过程中的基波和谐波的位相分布进行了测量，给出了相应结果。

Small signal solution of aberrated second harmonic generation is deduced from three-dimension three wave coupling functions. The numerical work gives out lot of results of different aberrations. The effects of the fundamental wave's aberrations, which will change the conversion efficiency, distribution of intensity and phase in the frequency conversion, is analyzed. It shows that when walk-off and diffraction effects could be ignored approximately estimation of the phase distribution of second-harmonic wave could be done. The far field divergent angle and second moment radius of harmonic wave will vary with the aberration of fundamental wave, but the far field divergent angle will be obviously smaller than that of fundamental wave. The phase distribution of both fundamental and harmonic wave is measured using Hartmann-Shack wave front sensor in the experiment with 1064nm and 790nm lasers, respectively. Results are given.

首次从三维三波相互作用方程组推导得到了位相畸变光束倍频的小信号解；通过建立三维数值模型，编写相应仿真程序，首次得到了位相畸变光束倍频过程的大量计算结果，深入细致地研究了位相畸变光束经非线性光学频率变换后谐波的转换效率、光强分布、位相分布以及影响它们的各种因素；得出谐波的远场发散角和光斑二阶矩的变化规律会因为基波像差的不同而不同，但谐波的远场发散角明显地比相应基波的小的结论；得到了在走离效应和衍射效应等影响许多因素可以忽略的情况下，位相畸变传递到二次谐波的估算式；举例分析了KDP三倍频方案中，基波位相畸变对二次谐波和三次谐波的影响；实验工作中，用哈特曼-夏克传感器分别对1064nm倍频过程和790飞秒超短脉冲倍频过程中的基波和谐波的位相分布进行了测量，给出了相应结果。

Using IGRF(International Geomagnetic Reference Field) workout by IAGA (International Association of Geomagnetism and Aeronomy), this paper investigates the geomagnetic field in the 20th century.

利用IAGA（国际地磁与高空物理学协会）编制的IGRF研究了20世纪地磁场变化规律。

We fix attention on the anticancer, analgesia an aesthesia and cardiovascular field. Especially in the synthesis field of camptothecin and bromine is keep ahead of domestic market.

致力于抗癌、镇痛麻醉和心脑血管等领域药物的研制与合成，特别在喜树碱类和溴铵类药物的合成方面，处于国内领先地位。

This study aims to investigate air bearing dynamics in near-field disk drives. This study compares air bearing airflows between the near-field optical disk with grooved surface and optical disks without grooved surface.

本文旨在研究近场光碟机空气轴承的动力学，比较当读写头的滑动片飞行於近场光碟片与飞行於传统碟片上方时，流场现象的差异。

Under different frontal wind velocity, the 3 dimensional airside of single row tube is simulated; the flow field and temperature field are analyzed and studied.

在不同迎面风速下，对单排管空气侧进行三维数值模拟，并对速度场、温度场进行分析和研究。

Under different frontal wind velocity, the 3 dimensional airside of double row tube is simulated; the flow field and temperature field are analyzed and studied.

在不同迎面风速下，对双排管空气侧进行三维数值模拟，并对速度场、温度场进行分析和研究。

So, we would read in field guides, the standard field guides that maybe you have on your shelves, you know, what beavers need is "A slowly meandering stream with aspen trees and alders and willows, near the water."

但河狸也有所需之物，所以无论是猎食或是被猎食，我们都能将其串连起来，创立一个网路，串连这些物种的栖地关系。

The two youngest repaired to the lodgings of one of the officers' wives, and Elizabeth continued her walk alone, crossing field after field at a quick pace, jumping over stiles and springing over puddles with impatient activity, and finding herself at last within view of the house, with weary ancles, dirty stockings, and a face glowing with the warmth of exercise.

两位妹妹上一个军官太太的家里去，留下伊丽莎白独个儿继续往前走，急急忙忙地大踏步走过了一片片田野，跨过了一道道围栅，跳过了一个个水洼，终于看见了那所屋子。她这时候已经双脚乏力，袜子上沾满了泥污，脸上也累得通红。

In Meryton they parted; the two youngest repaired to the lodgings of one of the office rs' wives, and Elizabeth continued her walk alone, crossing field after field at a quick pace, jumping over stiles and springing over puddles with impatient activity, and finding herself at last within view of the house, with weary ancles, dirty stockings, and a face glowing with the warmth of exercise.

三姐妹到了麦里屯便分了手；两位妹妹上一个军官太太的家里去，留下伊丽莎白独个儿继续往前走，急急忙忙地大踏步走过了一片片田野，跨过了一道道围栅，跳过了一个个水洼，终于看见了那所屋子。她这时候已经双脚乏力，袜子上沾满了泥污，脸上也累得通红。

You think you're a big shot.

你认为你是一个大人物？

All states are equal, and none can receive special treatment from the federal government.

所有的州都是平等的，任何州都不能获得联邦政府的特别待遇。