underground channel

This paper has recounted the application of gas survey to underground channel line and reservoir area exploration in four periods of the Yellow River water-drawing project, with emphasis placed on the effects of soil gas Hg and Rn.

本文介绍气体测量在四期引黄工程洞线和库区勘查中的应用，重点介绍了壤中气Hg、Rn的应用效果。

Effect of Position of Air Supply Opening on the Efficiency of Smoke Extraction in an Underground Long Channel

地下长通道补气口位置对火灾机械排烟效率的影响

The paper introduced a way of channel coding characteristic of communication mine underground.

信道编码是提高低压配电网窄带电力线通信可靠性的有效方法之一.

The author gives a detailed analysis about automatical collection for underground open channel flow and pipeline flow. Parshall flume and Manning formula are studied for open channel flow. 3.

对井下明渠流量自动采集与管道流量自动采集进行了详细的阐述，对于明渠流量自动采集主要研究了其中的巴歇尔槽和曼宁公式。

This paper treats of frequency stability of conventional 12-channel carrier transmitters as used in collieries, with particular reference to the considerable variations of underground transmission line impedance and fluctuations of supply voltage.

本文根据煤矿井下载波传输线路阻抗变化大、电源电压波动大的特点，针对传统的矿用十二路载波发射机，讨论了其振荡频率（即发射频率）的稳定性问题。

Three-dimensional Finite Element Analysis on Impact of Tunnel Excavation on Underground Channel

隧道施工对既有地下通道影响三维有限元分析