| 1. | At present , there are all kinds of digital program exchange systems , but these devices are of the following faults : 1 relatively short propagation distance
目前，数字程控调度交换系统虽然品牌众多，但都具有如下特点： 1调度平台发出的信号传输距离短。 |
| 2. | When the experimental frequency is above the critical frequency of 0 . 5 mhz , that the measured velocities are phase velocities must demand that propagation distance in the anisotropy media is less than two times of the transducer ' s diameter
以0 . 5mhz频率为界，大于此频率时，只要各向异性样品的传播距离小于换能器直径的两倍，测得的速度认为是相速度。 |
| 3. | The envelope equation of laser propagating in the plasma channel , and the general expression related the laser spot size with the propagation distance and the width of the plasma channel etc . , are derived based on the hamilton - jacobi equation and the refractive index equation
在此基础上得到了激光在等离子体隧道中传输的包络方程以及光斑半径与传输距离、隧道宽度等初始参量的关系。 |
| 4. | The results also indicate that , in a piece of gain medium , the cutoff frequency , " the most quickly growing frequency " and the integral exponential gain are variables of the beam intensity , medium gain coefficient and propagation distance
在考虑了介质的增益后，截止空间频率、最快增长频率以及最大增长因子不再像原始b - t理论中那样保持不变，它成了和光强、介质增益系数及传播距离有关的一个量。 |
| 5. | Numerical examples show that , pulse deformation and broadening , spectrum redshifting , narrowing and distortion take place with increasing diffraction angle in the near field , and the pulse form changes with propagation distance in the near field , but is preserved in the far field
数值计算例说明在近场随衍射角的增大会出现脉冲变形、加宽、谱红移、变形、变窄等特性，脉冲形状在近场随传输距离变化而变化，但在远场保持不变。 |
| 6. | Then , after computing xpd induced by rain , its forecast model at different propagation distance is found . this paper also discusses the relation of reflectivity of rain with rainfall rate , taking different polarization wave into account , and that of fog with visibility
在研究了雨、雾介电特性的基础上，计算了雨的去极化分辨率，得到了不同频率、不同传播距离的去极化分辨率预报模型；计算了不同极化状态的波的反射率随降雨率的变化规律。 |
| 7. | The main achievement of the paper is that the nnlse is simplified to a linear equation . it is found that we can controll a weak beam ' s phase to experience a very large phase shift within a rather short propagation distance by modulating the input power of a stronger soliton beam
本论文的主要贡献是：把光束的传输方程nnlse简化成一线性形式的近似方程，发现可以通过调节强孤子光束的功率来控制另一弱光的相位并能使之在极短的传输距离内产生大的相移。 |
| 8. | The propagation of ultrashort laser pulse in air is analyzed with mechanics analogy by considering kerr effects and free electron defocusing . the equation describing the evolution of the laser spot is derived . it is shown that long distance focusing requires large initial beam and the propagation distance is very sensitive to the initial divergence angle of the laser beam
考虑多光子电离效应和光学kerr效应，首次利用力学类比的方法研究了超短脉冲激光在电离气体中的传输，详细分析了传输距离与激光初始光斑、初始发散角以及激光功率的关系，提出了实现长距离传输的条件。 |
| 9. | As an example , we studied the co - propagation of two soliton beams with one ' s amplitude is much stronger than another . it is then found that the weaker ( probe beam ) can experience a very large phase shift within a rather short propagation distance by modulating the input power of the stronger ( pump beam ) . chapter 3 , nnlse is simulated for two beams propagation
以振幅一强一弱共同传输的孤子光束为例进行了具体研究，相位分析显示，与局域孤子相比，孤子光束在相当短的传输距离之内能产生大的相移，可以通过对强光(泵浦光)能量的调控来实现对弱光(信号光)的相位调制。 |
| 10. | Abstract : based on two order approximation of the variation of refraction index produced by self - action while optical pulses are traveling in kerr - medium , the propagation equation has been solved . furthermore , the strict analytical expressions of the amplitude , width and chirp parameter of chirped gaussian pulse , relative to the propagation distance , are deduced . the solitary wave traveling conditions of fundamental mode gaussian pulse have been discussed
文摘:将光脉冲在克尔介质中自作用产生的折射率变化作二阶近似，求解所得到的传播方程，得到啁啾高斯脉冲幅度，脉冲宽度和周啾参数随传播距离变化的严格解析解，讨论了基模高斯脉冲孤波传播的条件。 |
