The presence of dust at high redshift requires efficient condensation of grains in SN ejecta, in accordance with current theoretical models. Yet, observations of the few well studied SNe and SN remnants imply condensation efficiencies which are about two orders of magnitude smaller. Motivated by this tension, we have (i) revisited the model of Todini & Ferrara (2001) for dust formation in the e...

In order to deeply understand the overpressure propagation characteristics of explosion shock wave single-phase gas and gas-coal dust coupling in bifurcated tube, this paper makes a comprehensive in-depth study on change distribution law tube by means experimental research, results show that: is all affected bifurcation angle larger is, greater is. terms distribution, similar overall developmen...

A light echo around SN 1993J was observed 8.2 years after explosion by a HST WFPC2 observation, adding to the small family of supernovae with light echoes. The light echo was formed by supernova light scattered from a dust sheet, which lies 220 parsecs away from the supernova, 50 parsecs thick along the line of sight, as inferred from radius and width of the light echo. The dust inferred from t...

Hydrogen energy attracts an amount of attention as environmentally friendly and sustainable source. However, hydrogen is also flammable. fires explosions might occur in wet-dust-removal systems if accumulated aluminum dust reacts with water. inhibition a safe method to address these issues. For this purpose, we used sodium citrate, renewable nontoxic raw material inhibit H2 formation. Specifica...

Abstract Potentially explosive atmosphere can occur not only in the production systems of food, energy, chemical and petrochemical industries but also processes mining industry. Gases, vapours, mists dusts arise escape an uncontrolled way during production, processing, transportation storage flammable substances. In combination with oxygen, they create atmospheres that, if ignited, lead to expl...

Ensuring dust and explosion safety during underground coal mining is one of the most important tasks industrial labor protection departments. The main method preventing explosions settled in mine workings to process them with stone (rock dusting). traditional methods quality control rock dusting include radioisotope, optical chemical methods. To implement them, devices are equipped environmenta...