Light echoes from ancient supernova offer a unique and powerful opportunity to study supernovae and their relationships to supernova remnants (SNRs), as well as interstellar dust and Galactic structure. The use of this relatively simple phenomenon of light echoes in such studies is just now developing into an exciting new field of study. This is one of the very rare occasions in astronomy that ...

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We present multiband optical photometric and spectroscopic observations of an unusual Type II supernova, SN 2018hfm, which exploded in the nearby (d = 34.67 Mpc) dwarf galaxy PGC 1297331 with a very low star-formation rate (0.0270 M yr-1) subsolar metallicity environment(~ 0.5 Z). The V-band light curve 2018hfm reaches peak value -18.69+/-0.64 mag, followed by fast decline(4.42+/-0.13 mag (100d...

We present spectroscopic and photometric observations of the luminous narrow-line Type IIP (plateau) supernova 1994W. After the plateau phase (t ∼> 120 days), the light curve dropped by ∼ 3.5 mag in V in only 12 days. Between 125 and 197 days after explosion the supernova faded substantially faster than the decay rate of Co, and by day 197 it was 3.6 magnitudes less luminous in R compared to SN...

Due to the tightening of air pollution laws and employee safety regulations, manufacturers are being forced pay more attention removing dust particles from released by their installations. This requires them install large complex collection systems in all facilities. Dust include points where entrained drawn into a system pipes that carry air, fans feed movement collectors separate air. mostly ...

The accident in the Rasa mines of 28 February 1940 was the greatest tragedy in the history of mining in Istria; an explosion, most likely fuellled by methane and coal dust, claimed 185 lives and injured over a hundred people. Documentation made available by the courtesy of Zdravko Hrastnik, a collector from Labin, and the archieves of the Vicenza town hospital shed some light on this tragedy an...

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a novel mathematical model has been developed to aid the formulation of emulsion explosives. this mathematical model calculated heat of explosion, oxygen balance and raw material cost as a function of explosive ingredients, and the solution of the mathematical model was obtained by a ms excel program. the effects of the different content of nh4no3, nano3, h2o, and span-80 and composite fuel oil...

Sulfide ores play an extremely important role in the development of mineral resource base Russia, as a source rare, non-ferrous, and precious metals. However, sulfide ore deposits is associated with risk dust explosions, oxidative processes that lead to spontaneous combustion ores. The article substantiates urgency solving problem reducing risks taking into account changes balance gold-sulfide ...

We present a Spitzer/IRS low-resolution mid-infrared spectrum (5−14 μm) of the luminous transient discovered in the nearby galaxy NGC 300 in May 2008. This transient had peak luminosityMV ≃ −13, showed an optical spectrum dominated by relatively narrow Balmer and Ca II lines in emission, and its progenitor was identified in pre-explosion images as a dust-enshrouded ∼ 10 M⊙ star, characteristics...