Purpose. To develop methods for calculating of the expediency to use mine degassing system, made current composites, improve safety in heavily loaded longwalls. Methodology. Solving problems involved analysis studies concerning methane-air mixture removal from stopes while mining gaseous coal seams. Standard schemes gas transmission systems have been considered as well peculiarities transportat...

Knowledge of the outgassing history of radiogenic (40)Ar, derived over geologic time from the radioactive decay of (40)K, contributes to our understanding of the geodynamic history of the planet and the origin of volatiles on Earth's surface. The (40)Ar inventory of the atmosphere equals total (40)Ar outgassing during Earth history. Here, we report the current rate of (40)Ar outgassing, accesse...

Abstract Open-vent, persistently degassing volcanoes—such as Stromboli and Etna (Italy), Villarrica (Chile), Bagana Manam (Papua New Guinea), Fuego Pacaya (Guatemala) volcanoes—produce high gas fluxes infrequent violent strombolian or ‘paroxysmal’ eruptions that erupt very little magma. Here we draw on examples of open-vent volcanic systems to highlight the principal characteristics their regim...

Abstract The benign fuming activity of dormant volcanoes is punctuated by phases escalating degassing that, on some occasions, ultimately prelude to eruption. However, understanding the drivers such unrest complicated complex interplay between magmatic and hydrothermal processes. Some most comprehensively characterised have recently been observed at La Fossa cone Vulcano Island, but whether or ...

the effect of secondary steelmaking processes such as desulphurization, removal of inclusions and vacuumdegassing followed by hot forging and hardening heat treatment on the microstructure and mechanical properties of a hot-work w500 tool steel have been studied in details. in order to follow the progress of secondary steel making, the content of impurity elements such as s, p, o, h and n were ...