We present time-resolved spectrophotometry of GK Per taken on the rise to outburst maximum, in which we detect 5000 s QPOs in the optical emission lines. We use this opportunity to provide a kinematically-resolved analysis of the phenomenon. Observations are consistent with reprocessing oo blobs of gas orbiting within the inner accretion disc, and evidence is found for the migration of the QPO ...

Coal and gas outburst is an extremely complex dynamic phenomenon of mine gas, which mainly manifested in a very short time. A large amount coal rock are thrown out from the body to mining space accompanied by volume high-pressure gas. In process outburst, internal energy consumption composed two parts: one used throw broken mass, other pulverize coal. this article, perspective dissipation, expe...

Deep mining will increase the likelihood of coal and gas outburst accidents do harm to safety mining. In this study, a experiment under deep high-stress conditions was carried out stress–gas pressure–temperature response laws in rock surrounding burst hole were evaluated. The experimental results showed that stress around intense variation decreased as distance from position port increased. pre...

The shock wave of a coal and gas outburst is high-pressure high-speed impact airflow formed rapidly after the outburst. propagation destroys ventilation facilities causes destruction system. theoretical research on great significance. In order to deeply understand formation mechanism wave, this paper draws theory theoretically analyze microscopic process wave. main difference between general th...

In the present study, an investigation was carried out on Parvadeh coal mine in Tabas, Iran, to survey the effect of fractures on unusual methane gas emission in coal mines. This coal mine was chosen for investigating because of its high methane gas content in the coal body and available data from sensors in desired locations. Gas concentration monitoring programs were carried out at the mine s...