Burning rate accelerating catalysts are reckoned to be of important additives in the synthesis process of composite solid propellants on which much effort is made these days to suggest a novel procedure for their synthesis. Among many tasted chemicals, liquid ferrocene derivatives have been used much more vastly due to their better performance and suitable processability. But, these compounds s...

One way of thermal stability methods and ablation improving for polyurethane elastomers to solid propellant rocket insulation, is using of fillers with high ablation property such as silica particles. In this research, first polyurethane-silica composites (16, 25 and 38% by weight) and polyurethane-silica nanocomposites (5, 10, 16 and 25% by weight) were prepared and then interaction, morpholog...

Strengthening of copper matrix by dispersion of metallic oxides particles as an efficient way to increase strength without losing thermal and electrical conductivities has been recognized for many years. Such a composite can withstand high temperatures and keep its properties. Such copper alloys have many applications especially in high temperature including resistance welding electrodes, elect...

Temperature as an environmental factor, play important role in fish life. Angel fish (Pterophyllum scalare) is one of the most popular fish species that its production has developed in the ornemental fish industery and there is little information about the effect of rearing temprature in the aquarium. Hence, this study was carried out to investigate the effect of temperature on its body shape...

Polystyrene plastic material is a part of important packaging materials that is widely used. In recent decades, It is excessively applied in manufacturing of disposable drinking containers. Temprature is an important factor in determination the stability styrene monomer. The migration of styrene monomer in to hot drinks may cause chronic toxic effect in nervous system, liver and other organ of ...

Astragalus fridae of family Fabaceae has farmaceutical properties, Food and dustarial value.This plant is native to the province Semnan. Aftar village located in the North West of Semnan. Its main habitat is Aftr village located northwest of Semnan. This plant is endangered of extinction. The purposes of this project included: The study of anatomical structures of aerial organs, soluble Carbohy...