Gas drainage is an important measure to ensure energy safety in coal mines. However, for mines with high gas content and low permeability, the critical question how enhance effect of drilling. By using self-unloading pressure on body front mine, permeability can be improved, which facilitates drainage. Therefore, establishing fluid–solid model gas-bearing mass under influence mining, this paper...

there are human and animal health concerns related to drainage systems because nutrients, especially nitrogen and phosphorus, can contaminate water supplies. a field study was conducted on consolidated paddy fields of sari agricultural sciences and natural resources university, northern iran (36.3°n, 53.04°e), to determine the effect of subsurface drain depth and spacing on nitrogen (n) and pho...

Successful feeding and escape behaviors in fishes emerge from precise integration of locomotion and feeding movements. Fishes inhabit a wide range of habitats, including still ponds, turbulent rivers, and wave-pounded shorelines, and these habitats vary in several physical variables that can strongly impact both predator and prey. Temperature, the conditions of ambient flow, and light regimes a...

Gas control in the heading face of a coal roadway is an important and difficult point mining China. On basis analyzing disadvantages high gas cost long drainage period existing mine face, long-distance pre-drainage method drilling proposed to so as improve tunneling speed. Applied engineering geological conditions Changcun mine, technology studied detail. First, migration model considering perm...

Angiogenesis, the formation of new blood vessels from pre-existing, vessels is a crucial process for tumor growth and metastasis (Folkman 1990; Kaafarani, Fernandez-Sauze et al. 2009). The new vessels supply the tumor cells with nutrients and oxygen and ensure efficient drainage of metabolites. Under normal conditions, a tissue or tumor cannot grow beyond 1 to 2 mm in diameter without neovascul...