单程的

The stable wave-field propagators of one-way wave equation for Born and Rytov approximations are derived by using the local Born and local Rytov approximation methods in the scatter theory of wave-field propagation, and their application effects in prestack depth migration imaging of wave equation are compared theor...

利用波场传播散射理论中的局部Born近似和局部Rytov近似，分别导出了单程波方程的稳定的Born近似波场传播算子和稳定的Rytov近似波场传播算子，然后从理论和实践上比较了它们在地震数据波动方程叠前深度偏移成像中的应用效果。

The train tracks are helping to spur consumer spending, with Beijing residents traveling as far as 120 kilometers to shop in places like Tianjin, where prices are lower. The $8.50 one-way trip takes less than 30 minutes, attracting many middle-class passengers who see the bus—which takes three times as long—as a nonstarter.

铁路将促进人们的消费，如北京居民可能会到120公里外的天津去购物，因为天津的物价要低一些， Princess Jeannie 。8.5美元的单程用时只需花30分钟，这会吸引大量中产阶级乘客，这些中产者应该早就看不惯耗时三倍的长途客车了。

In order to investigate the effect of operating variabls on the yield of aromatics,a certain fraction of a straight run gasoline containing 48.4%naphthenes was catalytically converted into aromatics over a bed of 100 ml 14—20 mesh,granular,platforming catalyst under various opera- ting conditions.

用直馏汽油的某一馏分在装有100毫升14—20筛眼颗粒形铂重整催化剂的反应设备中，进行单程纯氢操作的铂重整反应条件试验以考察芳烃的生成与反应条件变化的关系。

In the work, employing a function with four undetermined parameters to model the source wavelet, an analytical relation between Q-factor and envelope peak instantaneous frequency is derived from the theory of one-way waves propagating in an anelastic medium; at the same time, a method for extracting instantaneous frequency in wavelet domain is developed for improving the precision and anti-noise performance of IF estimation, and based on these, a method called EPIF in wavelet domain is proposed for estimating Q-factor of VSP data.

本文采用一个具有4个待定参数的函数去逼近震源子波，利用黏弹介质中单程波传播理论推导出了地震子波包络峰值处瞬时频率和品质因子之间的解析关系；同时，为提高瞬时频率的估计精度和抗噪性能，在小波域中发展了一种计算瞬时频率的方法，并在此基础上提出了估算VSP资料Q值的方法，简称小波域包络峰值处瞬时频率法。

Because the glass edge hard, in glass full of cases, because the business card printing and membership card making stencil squeege up and down the friction, stencil pattern edge wear screen will quickly become available, this will reduce the service life of the screen.

因为玻璃的外部很刚健，在玻璃满印的环境下，由于制卡和会员卡制息刮板在网版上单程摩擦，网版的图案外部丝网会很快被磨损，这无疑会减多网版的搁置寿命。

The 1D wave equation inverse scattering problem includes many proce- dures such as time-depth conversion,Z transform,1D spectral fac- torization,reflection coefficient and transmission coefficient,et...

三维波动方程逆散射的关键环节可类比于一维波动方程反问题，一维波动方程逆散射中的时深转换、Z变换、一维谱分解和反射与透射系数等环节，在多维波动方程逆散射或速度横向变化介质逆散射的研究中，被替换为射线坐标系、单程波算子、基于Witt积的多维谱分解和反射与透射算子的平面波响应。

However, the continued wavefields in traditional one-way wave equation migration are not the downgoing or upgoing components of the acoustic pressure wavefields. The amplitudes on the migrated sections still disagree with the reflection coefficients even if the dynamic imaging condition is applied.

不过，传统单程波动方程偏移的延拓波场并不是全波场的上、下行声压分量，即使采用常规的动力学成像条件，得到的成像振幅与声压反射系数之间也没有直接联系。

Electric trams have operated on Hong Kong Island since 1904. The Hongkong Tramways Limited operates nine overlapping routes on 13 kilometres of double track along the northern shore of Hong Kong Island between Kennedy Town and Shau Kei Wan, and about three kilometres of single track around Happy Valley.

在港岛行走的电车，于一九零四年投入服务，由香港电车有限公司经营，共有九条部分重叠的行车路线，使用由港岛北岸坚尼地城至筲箕湾的13公里双程路轨，以及环绕跑马地长约三公里的单程路轨。

The single-pass Fischer-Tropsch synthesis with N_2-containing syngas thatwas produced from CH_4-Air-CO_2-H_2O reaction was also studied in fixed-bedreactor in this paper.

论文还采用由模拟抽放煤层气经CH_4-Air-CO_2-H_2O 反应制备的含有大量N_2 的合成气为原料，在固定床反应器上开展了原料单程通过的Fischer-Tropsch合成制液态烃的研究工作。

By using Fourier Optics a theoretical model based on single-pass compression is set up for the study of the pulse-front distortion. For the first time the effects of the pulse-front distortion on the spatial-temporal properties of the output pulse from the compressors.

利用傅立叶光学方法，建立了一个基于单程压缩构型的研究脉冲前沿畸变效应的理论模型，首次分析不同种脉冲前沿畸变效应对于压缩器输出脉冲的近场时空特性的影响。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。