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Propellant powders represent a very important category of explosive substances that enter into the composition of ammunition, with military and civil purpose, in general in all systems where it is necessary to perform a progressive mechanical work. Propellant powders are widely spread in the military field and deflagration is the main form of explosive transformation. Propellant powders, also called colloidal powders, are homogeneous mixtures containing one or more energy-providing substances. Due to their imprope...

Underground mining remains one of the most dangerous occupations in the world, and coalmining is known for its high accident rates. In this paper we aim to present an overview of safety in the extractive industry and we will present statistics on known accidents. The repeated occurrence of explosions in underground mining raises questions about the measures taken to prevent their occurrence. Hazard identification and risk analysis are necessary to identify adverse events that may lead to a hazardous situation, to ...