venting velocity

Analysis of the temperature field of fire is the basis of evaluating tunnel lining injury, developing advanced fire detection and alarm devices, guaranteeing the normal operation of ventilation machines, doing fire evacuation and rescue work smoothly and selecting rational ventilation velocity.

对火灾温度场的分析是判别衬砌结构损伤轻重、开发先进的火灾探测报警装置、保证通风设备的正常运行、顺利开展火灾疏散救援工作以及合理选择通风风速的基础。

Experimental determination of soil weathering rate;

土壤风化速率的实验测定

(4) Using the ratio of Sr isotope to calculate the weathering rate.

本文主要从环境生物地球化学角度加以论述,其应用主要包括四个方面:(1)用Rb-Sr系统进行地质测年;(2)利用锶同位素进行古环境的研究;(3)用锶同位素进行物源示踪;(4)用锶同位素计算流域的风化速率。