离焦

Based on the well-know Pennes'' bioheat equation,we calculated theoretically temperature field of HIFU-induced BFR in tissue,and measured spatial temperature rise in BFR induced by HIFU in freshly excised cow liver at constant acoustic intensity and exposure time, and studied the effects of the physical parameters of focused ultrasound transducer such as frequency,outer radius and curvature radius,focal depth, and acoustic intensity and exposure time on the temperature field of HIFU-induced BFR.

采用生物热传导方程理论计算了HIFU生物学焦域温度场，采用微型热电偶探针测量了HIFU辐照离体牛肝时靶组织温度分布；研究了聚焦超声换能器的物理参数、辐照深度和治疗剂量对HIFU生物学焦域温度场的影响；研究了HIFU在牛肝组织中的传播衰减。

According to XPS data, the surface basicity of active coke is mainly ascribed to the delocalized π electrons of carbon platelets.

由XPS数据可知。随着活性焦表面的氧含量的减少，离域π电子趋于活跃，活性焦的碱性增加，证实了碳原子平面层上的离域π电子是活性焦表面碱性位存在的主要原因。

To improve the quality of the image, the defocusing error was used to balance the piston error, spherical aberration and astigmatism, and the results were significantly improved, especially the wave surface variance caused by spherical aberration was decreased by 90%.

运用离焦误差对piston误差、球差和像散进行像差平衡，其效？灾乇鹗乔虿钜鸬牟娣讲钕陆？0％。系统各项像差系数随子孔径数的增加而降低；当子孔径数大于6时，各像差系数变化缓慢。

Finally, the law that laser reflection characteristics varies with the parameters of the transmitting laser beam and the cat eye optical lens, including aperture, focus and focal shift etc, is achieved.

得出了猫眼效应反射光特性随着入射激光参数以及猫眼光学镜头的基本参数——口径、焦距、离焦量变化的规律。

The instrument can measure the location, size and energy distributing of infrared guidance head imaging facula on the best image plane and off focus plane, displaying the results in data and 3D images with just one tap on the button. It can measure abaxial faculas as well.

它用数据和三维图形显示测量结果，可用于检测红外导引头最佳像面和离焦像面光斑的位置、大小及光能分布，并用于测试轴外视场的光斑，全部检测实现了&一键通&。

OBJECTIVE: To evaluate the influence of hydrogel soft contact lenses for correction of myopia on HOA.

目的： 分析佩戴软性角膜接触镜矫正青年单纯近视眼低阶离焦像差对高阶像差的影响。

Study on clarity-evaluation-function of out-of-focus blurred image.

离焦模糊图像清晰度评价函数的研究

Calculation of diffraction intensity of zone plate on misfocus condition.

离焦情况下波带片衍射光强的数值计算。

The C31 and C33 of the myopia subjects with moderate astigmatism show statistically significant changes after being fitted with both sphere and moderate cylinder trial lenses.

单纯近视者矫正离焦后引起C40的明显变化；近视中度散光者完全矫正屈光不正后呈现C31和C33的显著变化。

When the pressure of atmosphere is under 0.5 ATM, the image displacing is under 0.8mm. Studied the integrated characteristic for the system of glasses and BOL.

采用离焦法对系统进行校正，当环境气压变化小于0.5Pa时，系统的像面移动不超过0.8mm，研究了本系统使用的玻璃和衍射元件的综合气压特性，对解决其他光学系统气压的影响有一定的指导意义。

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％。