| 1. | S phase delay s
时相延迟 |
| 2. | Ultrasonic phased array technique can help to achieve flexible , controllable synthesized ultrasound beam by exciting each element of an ultrasonic array transducer with independent phase delay
超声相控阵技术通过对超声阵列换能器中各阵元进行相位控制，获得灵活可控的合成波束。 |
| 3. | A new accurate method for measuring the birefringence of muscovite mica has been reported in terms of the dispersion relations of the indices and the variety relations between the phase delay and the wavelength
摘要根据云母折射率的色散关系和相位延迟随波长变化关系，给出了一种测量双折射率比较精确的方法。 |
| 4. | Concerning the key technology of phase delay , the principles and its implementation of digital waveform phase delay based on waveform excitation is explained , which has achieved high transmission phase resolution in experimentation
对于相位延时这一关键技术，本文着重阐述了以波形激励为基础的数字波形相位延时的原理和实现，经实验达到了很高的发射延时分辨率。 |
| 5. | Through measuring the thickness of mica plates and the wavelengths at which they act as quarter wave phase retarders , the birefringence can be obtained in terms of the function relation between the phase delay , the wavelength and the thickness
通过测量云母材料的厚度和相应厚度情况下作为/ 4波片使用所对应的波长，利用相位延迟与波长及厚度函数关系式直接求得云母的双折射率。 |
| 6. | Calculations indicate that the carrier phase takes effect till the time width of the pulse envelope becomes smaller than the period of the carrier oscillation , and the interpretation of this phenomenon is also presented . it is the difference between phase delay and group delay that causes the sliding between the carrier and the envelope
数值分析的结果表明，当脉宽小于光波周期时，相位的作用开始显现出来，当脉宽比光波周期长时，载波相位的作用可以忽略，并分析了相位起作用的原因，用解析的方法说明正是相延迟和群延迟之间的差别造成了光载波在脉冲包络下的滑动。 |
| 7. | The variation of db magnitude attenuation and phase delay of reflection is uniformly proportional to distance along the line toward the direction of reflection , where the phase delay is 360 degree per wave length , the db attenuation per meter is twice the one way db attenuation per meter of forward or backward wave
沿传输线之反射，即反向传播与正向传播电压沿传输线之相量比，其相位落后及分贝衰减沿反射方向之变化则正比于线长，相位落后为每半波长三百六十度，每米之分贝衰减为正向波或反向波单程每米之分贝衰减之两倍。 |
| 8. | With the three - dimensional ray - tracing program , the simulation of leo - gps occultation is given . the radio path of occultation observation is simulated , and then the excess phase delay is calculated . this work can be used for studying the effects of the neutral atmosphere and ionosphere on the occultation observations and evaluating the performance of the inversion techniques
本文介绍了无线电掩星技术的发展状况和基本原理,围绕无线电掩星技术及其应用研究展开诸多研究和探讨,主要工作内容如下: 1 、利用全球三维射线追踪程序,开展leo - gps掩星观测的模拟研究,以计算掩星观测时电波传播路径、计算大气引起的附加相位时延等。 |
| 9. | Three finite - difference methods , i . e . , stagger grid , implicit and explicit algorithms , are analyzed in detail . multi - grid algorithm is firstly introduced in elastic wave simulation , to solve for the stability problem inherent in stagger grid and implicit algorithm , also for the efficiency problem inherent in explicit algorithm , and the precision , stability and efficiency for simulation of elastic wave arc increased by multi - grid method . phase - delay method is provided to effectively absorb boundary reflection and increase efficiency for wave motion simulation , based on phase delay and amplitude decaying features along wave propagation
在水平分层介质接收函数的波形反演研究的基础上，本文系统阐述了非均匀介质中弹性波传播数值模拟常用的三种有限差分方法：显式差分、隐式差分和交错网格法，首次将多重网格算法应用于弹性波方程的数值模拟问题，克服了交错网格法和显式差分法稳定性差，以及隐式差分法计算效率低的缺点，大大提高了弹性波数值模拟的精度、稳定性和计算效率。 |
| 10. | The process that light wave gets through arrayed waveguides can be regarded as a process of extracting spatial sample and filtering spatial frequency . spacial sample is accomplished by period interval arrangement of awg and spatial frequency filtering is accomplished by the fundamental mode and phase delay of each arrayed waveguide which is just a spatial frequency filter
而光场通过阵列波导的过程，可八硕士学住论文waiaster ’ stiesis以看作是空间抽样以及空间滤波的过程：空间抽样由阵列波导的周期间隔排列完成，空间滤波由每个阵列波导的基模形式以及位相延迟完成（阵列波导即为一空间滤波器） 。 |
