查询词典 aberration

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。

That makes for an annualised rate of contraction of almost 13 per cent, yet was not a quarterly aberration.

这意味着年度化的萎缩率达到将近13%，而且这并非一个季度的数据偏差。

Based on the third-order aberration theory,the pre-design parameters of the objective lens with aspheric surface were given.

基于三级像差理论，得出了采用非球面单透镜的平行光管的光学设计初始参数。

It suggested that the risk of one form of ovarian cancer may be elevated after use of the popular drug clomiphene, though researchers said the finding could have been a statistical aberration.

有报道在使用了常规的计生药克罗米芬后某种的卵巢癌的患病风险可能会增加，但是研究人员说结果并没有统计学上的意义。

The liquid crystal spatial light modulators are recently emerging as wavefront aberration correctors for use in low cost adaptive optics system.

纯相位液晶空间光调制器作为波前校正器构成的高分辨率、低能耗、价格低廉、易于控制的自适应光学系统受到越来越多的关注。

It was typically indirect effect that the following variations induced in the progenies of endosperms implanted by heavy ion beams were discovered. 1 In comparison with control, there were very high differences in biological trait, anti-oxidation enzyme activity, MDA content and protein content, chromosome aberration rate and micro-nucleus rate in M1 generation. 2 Shorter stem variants and purple stem mutants were analyzed by RAPD and AFLP. The analytic results showed that the sequences of their DNA were changed, so those variations were not physiological damage only. And there were differences among M2 generation plants of the same sort of variants or mutants, it was indicated that M2 generation may be in disjunction.

M1代的生物学性状、幼苗的抗氧化酶活性、MDA含量、蛋白质含量和染色体畸变率及微核率等发生了较大的变化。2）对其矮杆变异株和紫色茎杆突变体（M2）做RAPD和AFLP分子鉴定等研究，结果显示了矮杆变异体和紫色茎杆突变体的DNA序列发生了改变，而非仅仅产生生理损伤；同一种变异体或突变体，在M2代单株间也存在着明显的差异，表明它们可能还处于分离状态。

The paper design start point with a four-group the paraxial lens set with two groups lens of movements, among the first order and three order aberration is ignored. The imprimis acquisition optical zoom focal length start the structure.

本文的初始的设计以四群组成二群移动的理想透镜组，其中不考虑一阶及三阶象差，首先取得光学变焦的初始结构。

Background: The chromosome translocation t (8; 21)(q22; q22) is one of the most frequent karyotypic aberration in acute myeloid ...

背景 t（8；21）（q22；q22）染色体易位产生的AML1/ETO融合基因是儿童急性粒细胞白血病中最常见的融合基因之一。

Intraocular surgery has been used for refractive corrections with the development of aspheric intraocular lenes capble of correcting high order corneal aberration.

白内障手术已经进入屈光手术时代。新型的可以矫正角膜高阶像差的非球面人工晶状体已经陆续问世。

By removing this electronically Fujinon have been able to concentrate on making the lens very sharp without worrying about chromatic aberration.

通过消除这种电子富士龙已经能够把精力集中在镜头非常不用担心色差担心尖锐。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。