نتایج جستجو برای: explosion
تعداد نتایج: 17393 فیلتر نتایج به سال:
BACKGROUND Steam explosion pretreatment has been examined in many studies for enhancing the enzymatic digestibility of lignocellulosic biomass and is currently the most common pretreatment method in commercial biorefineries. The information available about the effect of the explosive decompression on the biochemical conversion is, however, very limited, and no studies prove that the latter is a...
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...
The intrinsic properties of some materials, such as foams, porous materials and granular materials, are their ability to mitigation waves. In this study, we investigated the ability of granular materials in explosion-induced wave mitigation. The present study was carried out using numerical simulations with Autodyn hydro-code and experimental tests by shock tube. Two materials of sawdust and mi...
for some 3 million years, the archaeological record is characterized by stone tools undergoing incremental changes. then around 40,000 years ago, the monotony of lithics is terminated by a profusion of visual representations, generally considered to be the world’s first objets d’art. this collection include a series of portable objects, especially figurines and, later on, the famous cave painti...
PBXN-109EB is a new plastic bonded explosive containing energetic binder system NHTPB-NPB that has better performance and energetic properties than PBXN-109. In this work, at first, kinetic parameters of thermal decomposition were extracted via kissinger method and differential scanning calorimetery (DCS) technique for PBXN-109EB in various heating rates and then its decomposition half-life (ag...
Nowadays, with increasing problems related to lack of water resources and energy problems, the dam construction industry is dramatically expanding in our country. On the other hand, increase of threats to unify the vital systems of the country, causing financial losses through the use of various explosive devices, Has found a special need in the country. In this research, it has been attempted ...
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