离焦

Solid immersion lens was employed to increase the optical writing density. The position of foci and numerical aperture of the focusing system with SIL were simulated, and the threedimensional optical data storage was conducted.

为进一步提高光存储密度，利用固体侵没透镜与数值孔径为0.55的长工作距离物镜对飞秒激光脉冲进行聚焦，完成了PMMA及石英介质上的存储实验，并对聚焦物镜焦点与SIL底面离焦时的介质内焦点位置和系统的数值孔径进行了模拟。

Influence of incoming laser beam and environmental factor on mechanical effect of plasma shock wave was studied.

为研究激光等离子体冲击波力学效应受入射激光及环境因素的影响，利用波长1.06 μm，脉冲能量320 mJ，脉宽10 ns的Nd：YAG激光作用在Al靶上，研究了冲量耦合系数和离焦量之间的关系。

The increment of weld penetration depth caused by heat sources distance is the most, which is 55%, and the effects of wire stick-out and laser defocused distance on the weld depth are also stronger.

其中，热源间距对熔深的影响最大，不同间距处的熔深增幅高达55％，焊丝干伸长和离焦量对焊接熔深也具有较强的影响。

This paper firstly proposed some clarity-evaluation-functions of out-of-focus blurred image,they are the sum of square of gray-level gradient vector module,the sum of Roberts-gradients,and the sum of Laplacian operator.

本文首次提出了用图像灰度梯度向量模方和、Roberts梯度和与拉普拉斯(8邻域微分)算子和作为由于离焦产生的模糊图像的评价函数。

This paper firstly proposed some clarity- evaluation- functions of out- of- focus blurred image,they are the sum of square of gray- level gradient vector module,the sum of Roberts- gradients,and the sum of L apla- cian operator.

本文首次提出了用图像灰度梯度向量模方和、Roberts梯度和与拉普拉斯(8邻域微分)算子和作为由于离焦产生的模糊图像的评价函数。

Dual waveband signals in high power laser welding were recorded and analyzed, especially, the law between the signals magnitude and the defocusing was discussed.

记录和分析了高功率激光焊接中工作区的紫外和红外信号，着重分析了双波段信号与离焦量变化的对应规律。

The main outcome measures were uncorrected distant visual acuity , best corrected distant visual acuity , uncorrected near visual acuity , distant-corrected near visual acuity , the best corrected near visual acuity , defocus curves and depth of focus, the rate of posterior capsule opacification of the study group, IOL decentration distance of the study group. A questionnaire was applied to evaluate the visual function and rate of spectacles usage.

术后检查内容包括：术后裸眼远视力、最佳矫正远视力、裸眼近视力、矫正远视力时的近视力、最佳矫正近视力；在两组患眼中选择最佳矫正远视力≥0.9的患眼进行焦点深度及离焦曲线测量；观察实验组后囊膜混浊情况；选取实验组的部分病例进行散瞳裂隙灯照相测量人工晶状体偏中心的距离。

Electronographic star images appear soft and out of focus.

电子照相得到的星象看起来模糊，似乎是离焦的像。

A new regularized iterative image restoration approach in the frequency domain has been introduced.

本文提出了一种在频率域进行图像正则迭代恢复的新方法，着重讨论了离焦图像的恢复问题。

To improve the quality of the image,the defocusing error was used to balance the piston error,spherical aberration and astigmatism...

运用离焦误差对p iston误差、球差和像散进行像差平衡，其效果显著，特别是球差引起的波面方差下降90%。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。