研究表明，在色散缓变光纤中利用拉曼自散射效应与负三阶色散效应的相互作用，可以获得更高压缩比的超短光脉。
The enhanced compression of fundamental femtosecond solitons can be obtained by combined effects of negative third order dispersion and Raman self scattering in the fibers.
针对输运修正引起的自散射截面导致的负概率抽样现象，提出了一种非负修正方法，并用基准计算验证了该方法的正确性。
Because of the phenomenon that the negative self-scattering cross sections cause the negative probability sample, a nonnegative corrected method is put forward and validated by the benchmark problems.
本文采用自回归模型得到肝脏组织不同区域的超声结构散射频谱，并对其频谱特征进行了统计分析。
In this paper, the ultrasonic spectra of liver's structural scattering were obtained by using autoregressive model, and the spectral characteristics were analyzed statistically.
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