utm meaning in English
深信服安全网关
通用横向麦卡托图
通用墨卡尔投影
网安实
威胁管理平台
一体化安全网关
整合型威胁管理
Examples
- Universal transverse mercator grid utm grid
统一横墨卡托方格网 - Universal transverse mercator utm
通用横轴墨卡托投影 - The unsteady . flow theory is used for calculate air flow velocity and one - dimension unsteady convection - diffusion model is used for calculate pollutant concentration ( called unsteady theory model in general , utm ) , and a new tunnel control method based on utm and neural network model is developed
本文首次采用更符合实际情况的隧道气流?维非恒定流理论和污染物浓度?维非恒定对流扩散模型(统称非恒定流理论模型)进行隧道通风控制方法的研究，并提出了一套基于非恒定流理论和神经网络模型的新的隧道通风控制方法。 - First , the difference between the stm and utm is compared and analyzed . the results show that it can accurately simulate the unsteady flow process of piston wind and the pollutant distribution in tunnel after train left the tunnel , can analyze and calculate the good effect of inertial action of piston wind if using utm
文中首先分析和比较了传统隧道通风设计所采用的恒定流理论与非恒定流理论的差别，表明运用非恒定流理论不仅更能准确模拟隧道内活塞风的非恒定流动过程，而且能模拟列车通过隧道过程中隧道内污染物浓度的分布，同时还能考虑利用隧道内气流(活塞风)惯性作用促进隧道通风，节约通风能耗。