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Moreover,the radius of focal spot increases with the spatial phase perturbation of the high-power ultraviolet laser.

研究结果表明：当传输距离超过阈值条件时，焦斑半径随传输距离的增大而明显增大，且相位畸变越大，焦斑半径也越大。

The diffraction distributions of Gaussian beam limited by the circular apertures with different sizes in scanning objectives focal plane were studied, and then the effective spot radius in focal plane was calculated using second moment and compared with the ideal one. The influence of apertures with different sizes on resolution was analyzed.

在不同孔径圆孔的限制下，对扫描物镜焦面上的衍射光场分布进行数值计算，并利用二阶矩统计的方法对焦面上的等效光斑半径进行数值计算，将其与不受限时的理想情况进行对比，分析孔径尺度对激光束扫描系统分辨率的影响。

The variation of focal spot size with the spatial phase perturbation and propagation distance has been analyzed quantitatively.The results indicate that the radius of focal spot increases with the propagation distance if once the threshold condition fulfilled.

讨论了强紫外激光在空气长程传输中所产生的受激旋转喇曼散射效应对其聚焦光斑形态的变化，定量分析了焦斑半径随入射强紫外激光的空间相位畸变及传输距离的变化。

It's M2 factor is approaching the ideal value 1 and the beam intensity profile remains Gauss Profile. Laser beam with good propagation and focus characters. The beam can propagate a long way and can be focused with lens with long focal distance. The focal beam waist radius is 134μm, the focal distanced of the focus lens is 300mm. It's focal depth is about 5mm and the focal shift is about 1mm in the range of processing (3m).

结果表明，Slab CO2激光器具有高光束质量，其M2因子非常接近1的理想值；激光束具有良好的传输和聚焦性能，可以长距离传输；使用焦距为300mm的聚焦镜聚焦，聚焦光斑的束腰半径约为134μm，光束横截面能量分布接近理想的高斯分布，焦深约为5mm，在加工范围内(3m)，激光束的焦点漂移量大约为1mm。

The results indicate that multiple reflections are favorable to the increase of depth. When the focal position is above the surface, the absorptive intensity on the front decreases, so the cutting depth decreases. When the focal position is below the surface, the position on the front with the maximum power intensity is downward. The intensity distribution is toward the deeper position, the cutting depth increases. But if the negative focal distance is extremely big, the intensity of the deeper position attenuates sharply with the increase of focal radius and light distances, so the depth deceases.

正离焦切割时，前沿吸收的总激光功率密度减小，切割深度减小；负离焦切割时，最大激光功率密度值的位置下移，使得前沿功率密度分布朝着深部推进，切割深度增加，若负离焦量过大，表面光斑直径和光程增加，更深位置的功率密度减小，切割深度减小；随着激光功率增加、切割速度减小，则前沿弯曲程度减小，被激光直接照射的前沿部位增长，前沿吸收激光功率密度增加，切割深度增加。

In order to folding a door body to revolve radius small, the door can make use of well after opening with door hole for center before behind space, so fold door applicably in the mansion hallway, industrial factory premises, warehouse, etc.

由于折叠门门体的旋转半径小，门开启后可充分利用以门洞为中心之前后空间，因此折叠门可适用于大楼走廊、工业厂房、仓库、等需要较大有效宽度的地方。

For calculating the force of gravity on a satellite, the radius of the earth is irrelevant.

计算地球作用于卫星的重力时，地球的半径是无关紧要的。

Considering that the formulae of mathematical function of measured radius and t...

本文最后分析了影响被测半径精度的各种因素。

Because the four-wheeler change direction the turn radius of vehicle obvious small in front rotate toward the vehicle, make the engineering vehicle have to pass sex goodly in the narrow place.

由于四轮转向车辆的转弯半径明显小于前轮转向车辆，使工程车辆在狭窄场地具有良好的通过性。

Appropriate vibration frequence, radius of the crucible and height of the liquid were chosen through simulation.

然后通过模拟实验选择了合适的振动频率，熔体的高度和容器的直径。

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％。