نتایج جستجو برای: burning
تعداد نتایج: 18519 فیلتر نتایج به سال:
The method of foil embedding is employed in solid propellant motors with end-burning configuration, thereby significantly improving the burning rate of the propellants. These foils provide such amplification by locally augmenting heat feedback from propellant combustion products to unburned solid material, with resultant increase in burning surface area. Burning rate would raise with the incr...
Burning Mouth Syndrome (BMS) is a chronic pain condition characterized by an intraoral burning sensation and absence of oral mucosal lesions disturbances in laboratory findings. symptoms usually affect the anterior two-thirds tongue, its lateral borders, hard palate labial mucosa, but other cavity sites may also be affected. Taste alterations decrease salivary flow rate frequently accompany sym...
By comparing the empirical and predicted performance diagrams of the composite solid propellants, it appears that there is a discrepancy between these two graphs .This deviation has been attributed to spatial burning rate variation which is related to burning rate fluctuation or hump effect. The most important reasons for this spatial burning rate variation are casting process. In order to appr...
Investigation shows that the some complex and expanded parameters are effective on the burning rate. In this paper we evaluate the effect of particles dispersion, size of AP particle, the size of Al particles, Fe2O3, viscosity, shape factor, the size of mixer and the mechanical parameters such as tensile and stress on the burning rate. These studies show that the decrease of AP particles, size ...
The influence of the initial fuel temperature on the burning behavior of n-heptane pool fire was experimentally studied at the State Key Laboratory of Fire Science (SKLFS) large test hall. Circular pool fires with diameters of 100mm, 141 mm, and 200 mm were considered with initial fuel temperatures ranging from 290 K to 363 K. Burning rate and temperature distributions in fuel and vessel wall w...
objectives this study investigates the prevalence of burning mouth symptom for the first time in an institutional group of patients in shiraz, iran, among whom some were found to have bms through excluding the recognizable physical or biochemical causes of mouth burning. methods in this cross sectional study, from the existing records of 2 533 patients who referred to shiraz dental school since...
Although a many studies concerning crop residue burning have been conducted, the influence of crop residue burning on local PM2.5 concentrations remains unclear. The number of crop residue burning spots was the highest in Heilongjiang province and we extracted crop residue burning spots for this region using MOD14A1 (Thermal Anomalies & Fire Daily L3 Global 1 km) data and national land cover da...
introduction: burning mouth syndrome (bms) is defined as burning and pain in the oral mucosa usually without any clinical and laboratory findings. it has a negative effect on patients' quality of life and can be a significant health problem. the aim of this study was to identify major risk factors associated with bms in menopausal and non-menopausal women at dental clinics of gorgan, iran. meth...
Graph burning is a deterministic discrete time graph process that can be interpreted as a model for the spread of influence in social networks. The burning number of a graph is the minimum number of steps in a graph burning process for that graph. In this paper, we consider the burning number of graph products. We find some general bounds on the burning number of the Cartesian product and the s...
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