The utilization of solid wastes (SWs) as a potential resource for backfilling is not only conducive to environmental protection but also reduces the surface storage waste. Two types SWs, including fly ash (FA) and desulfurized gypsum (DG), were used prepare cementitious materials underground mined-out areas. Ordinary Portland cement (OPC) was in mine backfill. To better investigate feasibility ...

In the process of coal resources development, a large number strip pillars have been left behind in mines central–eastern China. With increase mining depth year by year, rock burst threat is becoming more and prominent due to influence buried depth, geological structure, gob other factors. Backfilling main means recover residual pillar. order investigate effect backfilling on prevention control...

Detailed simulations for Terahertz quantum cascade lasers based on two-well designs are presented. We reproduce the maximal operation temperatures observed and attribute degradation with temperature to occupation of parasitic levels thermal backfilling. Furthermore, we demonstrate that current injection can be conveniently studied by using EZ states, which combine energy selectivity spatial loc...