Solutions of a 1-D free-interface problem modeling solid combustion front propagating in combustible mixture with periodically varying concentration of reactant exhibit classical phenomenon of mode locking. Numerical simulation shows a variety of locked periodic, quasi-periodic and chaotic solutions. PACS: 05.45.-a, 02.30.Oz, 81.20.Ka

Fire protection is a basic safety issue for all categories of buildings. The criteria effective fire suppression and the characteristics extinguishing systems in insulated areas depend on combination factors. main influences include type combustible material, ambient temperature, spray extinguisher, air inflow outflow conditions, space geometry. This article analyzes most widely used fire-extin...

An experimental study of ignition risk due to hot points in the storage of bulk materials is required to ensure fire safety. Many parameters are involved in this phenomenon: nature of the material, storage volume and temperature, type and size of hot point, etc. The aim of this study is to determine critical ignition temperatures of hot spots embedded in powder materials for different condition...

The availability of well-defined modified graphene derivatives such as fluorographene, graphane, thiographene or hydroxygraphene is of pivotal importance for tuning the resulting material properties in numerous potential applications. A series of fluorinated graphene with various contents of fluorine was synthesized by a simple fluorination procedure in an autoclave with a nitrogen/fluorine atm...

BACKGROUND Increased knowledge of the harmful effects of SHS is an evidence-based key indicator for eliminating nonsmokers' exposure to SHS. This study assessed the prevalence and predictors of perceptions about the harm of secondhand smoke (SHS) exposure among U.S. middle and high school students. FINDINGS Data were obtained from the 2012 National Youth Tobacco Survey, a nationally represent...

Highly combustible gases such as hydrogen, propane, and acetylene are used at all nuclear power plants. Hydrogen is of particular importance because it is stored in large quantities and is distributed and used continuously in buildings containing safety-related equipment. Large hydrogen releases at the hydrogen storage facilities or in these buildings could lead to fires or explosions that migh...

In this paper, a wood coating based on waterborne polyurethane (WPU)/nano-cellulose crystalline (CNC)/Magnesium hydroxide (MH) was prepared. Efficient dispersion of MH in WPU presence 5 wt% CNCs observed by biological microscope leading to material with improved esthetic, thermal and fire-retardant properties mechanical performance. By thermogravimetric analysis (TG/DTG) comparison WPU, the max...

in this paper, we examine the effects of thermal radiation on co2 emission and o2 depletion in an exothermic reactive slab of combustible materials with uniform surface temperature. the governing equations for the nonlinear heat and mass transfer problem are derived and solved numerically using runge-kutta-fehlberg method with shooting technique. numerical expressions for temperature field, co2...