Nowadays, tunneling in urban areas is a common activity for a variety of transportations such as subways, water supply, lifelines andsewers that may require blast operations. The characteristics of stress waves of the blast are quite different from earthquake waves. The blast waves are usually of high frequency content, short duration, equality of amplitudes in horizontal and vertical direction...

The two major problems, still associated with the SN1987A, are: a) the signals observed with the gravitational waves detectors, b) the duration of the collapse. Indeed, the sensitivity of the gravitational wave detectors seems to be small for detecting gravitational waves and, while some experimental data indicate a duration of order of hours, most theories assume that the collapse develops in ...

The rise in hydrogen fuel cell electric vehicles (FCEVs) is expected to pose a variety of hazards on the road. Vehicles using could cause significant damage, owing vapor cloud explosions, jet fires caused by leakage, or tank explosions. This risk further increase semi-enclosed spaces, such as underground parking lots and road tunnels. Therefore, it necessary study fire safety spaces. In this st...

With the continuous improvement of level intelligence in coal mines, construction sites have put forward new requirements for performance and compatibility mining computers. Aiming at field conditions intelligent underground drilling this paper designs a mine-used encapsulated intrinsically safe computer as data processing terminal, with characteristics large display screen, moderate overall we...

Abstract Electric explosion-proof trackless rubber-wheeled vehicles in coal mines usually use braking energy recovery technology to improve cruising range. In order the efficiency of vehicle and safety performance, this paper proposes a control strategy for electric based on road condition recognition. This is mine underground positioning technology, adopts different strategies conditions, whil...