NM：负媒质

“Negative Medium”在学术与科学领域，尤其在数学相关文献中，常被缩写为NM，以方便快速书写和引用。这种简写方式有效提升了专业交流的效率。其中文对应术语为“负媒质”，这一概念在特定学科背景下具有重要的理论价值。

Electromagnetic field generated by a horizontal electric dipole on double negative medium half space
水平电偶极子在负折射媒质半空间激励的场偶极子与偶极子相互酌
In this thesis, the electromagnetic ( EM ) wave propagation and scattering in double negative medium ( DNG ) are investigated with finite-difference time-domain ( FDTD ) method and CST software. The applications of DNG to reduce RCS are discussed.
本论文用时域有限差分（FDTD：Finite-DifferenceTime-Domain）方法和CST软件对电磁波在双负介质中的传播和散射特性进行了研究，探讨其在隐身方面的应用。
Study of Chirps Induced by Nonlinear Effects in the Negative Refractive Medium
负折射介质中各阶非线性效应所致啁啾的研究
The optical cavities of general curved-mirrors with a negative lenslike medium are discussed, and used to analyze the thermal lensing effects in gas lasers.
本文讨论了类负透镜介质一般曲面镜光学谐振腔，并用来分析气体激光器中的热透镜效应。
The results show : both pulse width and bandwidth are widened in positive dispersion medium, but pulse width is getting more and more narrow along propagating direction in negative dispersion medium, which is a typical soliton pulse.
结果表明：在正色散介质中，脉宽及带宽均展宽，而在负色散介质中，脉冲沿传播方向越来越窄，表现为孤子效应。

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