background & objectives: neutrophils are the most important member of granulocytes & the first line of host defence against micro-organisms. they kill micro-organisms entering the body by phagocytic activity. one of the important phases of phagocytic activity is respiratory burst which can be effected by different drugs such as cimetidine. in this study the effects of cimetidine on respiratory ...

The rock burst induced by the mutual disturbance of mining and excavation is significantly influenced high static load stress external dynamic disturbance. In this paper, evolution characteristics progressive damage mechanism surrounding in process are systematically studied. results show that can be roughly divided into three stages: rapid rise early stage, continuous step-like decline middle ...

The occurrence regularity of the coal mine earthquake under influence hard roof, fault, and mining was studied by theoretical analysis, field investigation, monitoring data analysis for phenomenon rock burst induced earthquakes. dissipation characteristics energy propagation considering a hypocenter scale were described, response analyzed. two principles fractured type earthquakes three princip...

In order to solve the engineering problem that bolt tail is often broken under impact of rock pressure, mining stress and damage support structure contribute great hidden danger safety tunneling. A new anti-impact designed can absorb energy pressure. The double laminated springs inner spring deform load achieve purpose absorbing most energy. composition working principle energy-absorbing introd...

Abstract Ground support is widely implemented to mitigate dynamic rock failures in underground mines. This paper investigated the ground requirements burst-prone mines catastrophic of and/or coal bursts. First, principles and considerations conditions are identified. The objective a system increase capacity accommodate fracturing rockburst and, turn, minimize kinetic energy ejected material. ca...