This feature makes it possible for photorefractive phase conjugator to find applications in many fields where the wavefront - reversing properties are required 由于位相共轭光是入射光的传播方向及各处位相因子的准确反转，因此在众多领域得到广泛应用。
Change in the direction of propagation of radiation determined by change in the velocity of propagation in passing through an optically nonhomogeneous medium , or in passing from one medium to another 当辐射通过光学异性的界面，或从一种媒质进入另一种媒质时，传播速度的改变而导致的辐射传播方向的改变。
The directivity shows that the np i is the fault plane , and that the earthquake ruptured unilaterally from the northeast to the southwest , nearly perpendicular to the strike of the java trench P波显示的方向性效应表明：走向为199的节面是断层面。破裂传播方向为自东北向西南方向，几乎垂直于爪哇海沟走向。
The opening of the silk road in the first century bc , for example , meant that knowledge of winemaking passed eastwards from the middle east to china , while the idea of noodles moved in the opposite direction 例如，公元前1世纪开通的丝绸之路在当时意味着酿酒技术从中东地区传向东方的中国，而面条制作工艺的传播方向则刚好相反。
Based on the relationship between elastic constants and sound velocities in composite material and measuring very few velocities of different propagation direction , the elastic constant matrix can be calculated out 依据复合材料中声波速度与材料弹性常数之间的本构关系，测量不同传播方向的少数几个声速，就可以得到其弹性常数矩阵。
In this paper new kinds of y - type and s - type dual - path mass - loading sensor devices fabricated on 128 ? rotated y cut x propagating linbo3 substrate are reported . there are one input idt and two output idts in these devices 本论文在128旋转y切割? x传播方向的linio _ 3基片上研制了结构新型的y型和s型双声路声表面波质量沉积效应传感器件。
Otherwise it decreases with the dielectric constant . since the direction of the particle chains is different from that of microwave transmission , which was considered to have different effect on microwave attenuation . two different erf containers for measuring the microwave transmittance were made 考虑到微波传播方向与电流变液颗粒链方向不同会造成微波衰减的不同，因此设计并制作了两种用于测量电流变液微波透射率的电流变液样品盒。
When pure shear wave propagate in anisotropy media , even thought propagation direction is parallel to the direction of aligned cracks , experimental results exhibit that only two kinds of shear - wave velocity can be measured - fast shear wave and slow shear wave neglecting polarization direction 这个实验结果进一步表明，纯横波在各向异性介质传播时，即横波的传播方向与裂隙平行，无论横波的偏振怎样改变，只能观测到两种横波速度，快横波和慢横波。
The numerical simulations show that the phase plane and amplitude plane in orthotropic fluid - saturated porous media is not paralleled to each other any more though the dispersion caused by the fluid is omitted . it is one kind of non - homogeneous wave . the maximum attenuation is no longer 指出由于介质的各向异性，尽管忽略了流体粘度引起的粘度耗散，正交各向异性液饱和多孔介质中瑞利波的相平面和幅平面亦不再重合，为非均匀波，最大的衰减不再沿波传播方向。
Using the two - stream fluid model , the linear dispersion relation is derived assuming a two - dimensional spatial geometry . two cases are considered , one is that the 2d spatial geometry is defined by the plane containing the two counterstreaming electron populations and the perturbation wave vector ( referred as the xy plane ) , and the other is that the geometry is defined by the plane being vertical to the two counterstreaming electron populations ( referred as the yz plane ) 对高能束流和电子回流构成的双流系统，建立冷等离子体流体模型，采用简正模分析方法，分别考虑扰动波矢在平行于电流传播方向的平面(记为xy平面)上和在垂直于电流传播方向的平面(记为yz平面)上这两种情况，推导了不稳定性的色散关系。
