相位

Theoretical analysis demonstrates that the phase change caused by the shift of illuminated light is ignored in discussion before.In this study,this method is corrected by overlapping a phase factor and a new method is put forward to eliminate the effects of this factor by utilizing the phase characteristics of squared Bessel function.

理论分析发现，以往的讨论忽略了照明光之间位移引起的相位变化，研究通过叠加一个相位因子对此进行了修正，并利用贝塞尔函数平方的相位特点提出了消除该相位因子的办法。

The phase of optical wave can be recovered by the intensity transport equation under the paraxial approximation For the optical system with diffraction limit, it is difficult to get the boundary radical slope of phase and sample in the circular domain boundary when using the intensity transport equation to recover the phase, consequently, we reviewed an algorithm mentioned in the reference ［4］, namely, the equation, computation domain and boundary condition are changed, then the phase is reconstructed by the multigrid method and corrected at last Moreover, the experiment system is set to testify the algorithm, and the recovered phase from the intensity data detected by CCD is compared with the result from phase retrieval algorithm, it is found that the phase reconstruction error can reach 017 λ in the case of non-uniform intensity distribution, as a result, the method is suitable for the phase recovery with low wavefront sensing accuracy.

在傍轴近似条件下，可以利用光强传播方程对畸变波前进行相位恢复。对于衍射受限的光学系统，很难获得相位的边界径向斜率值作为边界条件，此外，要获得精确的圆域边界采样值也并非易事。为了克服上述困难，进一步研究了相位恢复改进方法，即改变了方程的表示形式、计算区域和边界条件，并用多重网格法进行求解获得重构相位，最后再将其修正。为了验证算法的精确性，搭建了实验系统对算法进行实验验证，将由CCD探测的光强分布进行计算得到的相位分布与相位恢复算法的结果进行比较，证明在光强分布非均匀的情况下，该方法恢复的相位均方根误差能够达到017 λ，可以适用于波前传感精度要求不是很高的相位恢复。标签自适应光学相位恢复相位修正光强传播方程 adaptive optics phase retrieval phase correction intensity transport equation

It can get the three-dimensional profile of the object surface effectively. Because of the cragginess of the three-dimensional surface when sine grating is projected the image of the sine grating is modulated and the modulated image is taken by a CCD camera with an angel compared to projecting direction. After the phase shift measuring method, the phase is gotten. Because the phase is calculated by the phase shift measuring ranges from –π to +π it isn't continuous. The phase unwrapping is necessary to recover the continuous phase about the object shape.

这种方法采用结构光照明，将正弦光栅图像投影到被测物体表面，用与投影方向成一定角度的CCD摄像机获取受物体表面面形调制的变形光栅像，根据数字相移算法计算出相位分布，由于从相移计算的相位被截断在反三角函数的主值范围内，因而是不连续的，必须通过相位展开恢复出连续相位分布，由相位－高度关系最终求出物体轮廓的三维数据信息。

Based on the analysis of current situation of urban traffic signal control, a method of single intersection signal control was presented based on fuzzy neural network control. Density of vehicle flow of current and next phase was determined by detecting the queue length of the current and next phase, so that it was further determined whether the phase should be changed or not.

在分析城市交通信号控制研究现状的基础上，提出一种基于神经网络模糊控制的单路口交通信号灯控制方法，通过检测当前相位的排队长度和下一相位的排队长度得出当前相位以及下一相位的车流密度，进而判断是否进行相位变换。

In order to meet the demand of precise measurement and applications, the principle of phase retardation with oblique incident angle is expounded, based on the total-reflection phase transformation theory of the phase retardation. By means of Fresnel rhomb, the variation law of the phase retardation for rhomb-type retarder with the incident angle is analyzed. The result indicates that incident angle has obvious influence over the phase retardation.The phase retardation is sensitive to the incident angle, and also has close correlation to incident position of the incident ray, which is asymmetrical to the incident position of the incident ray.

为满足精确应用和测量的需求，从相位延迟的全反射相变理论出发，阐述了斜入射相位延迟原理，以菲涅耳菱体为例，分析了菱体型相位延迟器相位延迟随其入射角变化的规律性，结果表明：当光线非严格准直时，光的入射角对相位延迟量有明显的影响，延迟量不但对入射角变化敏感，而且还与入射光线的入射方位密切相关，呈不对称形式。

While the most dismally traditional astrologers referred to these angular relationships as "malefic" or "evil" due to the dynamic and challenging quality of the interaction between the 2 planets involved, the Hamburg School astrologers and the later Cosmobiologists and Uranian astrologers have continually verified that these are the most energetic angular relationships and therefore of greater significance for personal growth, and for prognosis of significant change and developmental periods.

90dial 盘的基本定理不是那么复杂， dial 是基于 4 倍相位的，把 360 度圆分成 4 个相等的部分 360 ÷ 4 = 90 ，根据占星家们几个世纪的经验，对应传统相位的合相 0 度，刑相（ 90 度和 270 度）和冲相 180 度的 4 倍相位，是行星间非常有力的关键相位，由于产生这这个相位的两颗行星互相改变与挑战对方，许多传统的占星学家会认为这个相位是有害的，甚至邪恶的，汉堡占星学家和稍微晚一些的宇宙生物学家经过长期的经验，认为 90 度相位是非常有力的基本角状角度，所以对个人成长非常有利，对日后的改变与发展非常有利。

Due to the fact that the intercarrier spacing in OFDM is relatively small, OFDM transceivers are somewhat more sensitive to phase noise compared to single carrier transceivers. Thus this problem must be carefully considered in designing an OFDMbased system since an accurate prediction of the tolerable phase noise can allow designer to relax system specifications. According to spectrum theorem, two components of phase noise were analyzed: common phase error and intercarrier interference. On the basis of the analysis, the performance of OFDM was given for the case where phase noise has been added to the signal, and an optimal design criterion for OFDM parameters was proposed that allows to improve the phase noise error correcting capabilities in OFDM receiver.

由于采用子载波间相互正交的结构，OFDM系统对于由本地振荡器不稳定性所导致的相位噪声影响非常敏感，针对公共相位误差CPE和载波间干扰ICI两种影响表现形式不同的干扰项，从功率谱密度函数这一独特角度分析了相位噪声对OFDM系统性能的影响，提出了旨在提高接收机抵抗相位噪声能力的OFDM系统关键参数优化与设计准则，可在对所设计OFDM系统性能加以提高的同时，有效降低对接收机前端模拟振荡器件和相位噪声抑制单元的性能指标要求，从而降低接收机硬件实现成本。

The above results showed that physiological AAI pacing maintained a normal EAS and VAS, and improved or enhanced VSS; while nonphysiological VVI pacing and physiological DDD pacing induced the decrease in VSS due to an abnormal EAS and VAS. Furthermore, with increasing the pacing rate, VSS was markedly decreased.The quantitative comparison of parameters of left ventricular systolic function obtained by computerized ERNA showed that AAI pacing induced the significant increases in ventricular ejection rate and stroke volume with concomitant shortening of ejection time.

应用计算机-ERNA相位分析技术，对13例生理性AAI、13例非生理性VVI及6例生理性DDD患者，分别进行等相位电影，相位图，相位直方图和VSS参数的静动态观察和定量比较，结果显示：AAI起搏可维持正常EAS和VAS，心室相位均匀一致，并且VSS参数-相角程，半高宽和峰相位标准差均较起搏前分别降低，提示起搏后VSS有所改善或增强。

In chapter 3, characteristic paraments, focusing structure were discussed, the processing of double cell for phase conjugation was analyzed. Designing criteria of double cell phase conjugation mirror was given out. All phase aberrations could be compensated by using phase conjugation theoretically, but compensation is only effective to phase aberration of uniform polarizing state, it is not effective to aberration by thermally induced depolarization an diffractive effecting by aperture.

在第三章，我们讨论了SBS介质的特性参数，相位共轭镜的聚焦结构，分析了双池相位共轭镜的相互作用过程，给出了相位共轭镜的设计原则；从理论上讲相位共轭技术可以完全补偿热畸变以及因各种光学不均匀性造成的光束畸变，但是相位共轭技术只对偏振态均匀的相位畸变造成的光束畸变起补偿作用，而对由于热致双折射效应造成的退偏以及光束通过硬边光阑时的衍射效应造成的光束畸变无能为力。

Phase noise mainly comes from laser linewidth,laser phase offset,in/quadrature phase mismatch,90° hybrid phase imbalance,fiber channel and component in optical quadrature phase shift keyed transmission system.

在光四相相移键控系统中，相位噪声主要源于激光器的线宽、激光器的相位偏移、同相支路和正交支路相位不匹配、90°混频器的相位不平衡以及光纤和器件等引起的相位变化。

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％。