dormancy of eastern dodder and african rocket seeds makes the controlof them very difficult in orchards and farms. in order to study the effective factors in dormancy breaking of these two weeds species, a factorialexperiment based on crd with three replications was conducted at the research laboratory of birjand faculty of agriculture in 2008 and 2009. treatments were: control, soaking in sulf...

A three-dimensional-printed solid fuel grain with a star-fractal swirl port was developed to improve the regression rate of hybrid rockets. The printing material used for grains an acrylonitrile-butadiene-styrene resin. Nitrous oxide employed as oxidizer. Combustion experiments on rocket engine showed that appeared thrust and specific impulse compared classical circular ports when tested using ...

The article presents methodical and technological approaches to the study of performance confirming main characteristics solid fuel rocket engines (SFRI), which are part various means destruction, as well directions organization features relevant fire bench tests.
 SFRI is one most important components modern largely determine their tactical technical operational safety. By condition, we m...

Chemical propellants are a type of fuel that commonly used in rocket engines to provide the thrust necessary for space exploration and satellite launches. They composed mixture chemicals react produce hot gas, which is then expelled from engine generate required force. An overview properties applications chemical propellants, including their composition, performance, environmental impact provid...

The interest in interplanetary space travel has stimulated much discussion on the desirability of using nuclear, rather than chemical, energy for the spacecraft propulsion. Comparisons of the relative merits of various propulsion systems have been extensively discussed in the literature. The results of such studies yield a diversity of conclusions, depending on the assumptions which are made in...

I N T H E course of its flight, the occupants of a passenger-carrying rocket are subjected to accelerations differing substantially from that normally experienced. T, he use of a human centri.fuge capable of high peak acceleration and rate of change of acceleration allows us to duplicate sufficiently closely the acceleration curves of a rocket and to determine their effect on human beings in ad...

The thermal environment is an important factor in the design of liquid rockets. In this paper, theoretical analysis, numerical simulation and experimental testing are conducted to study boundary characteristics a GOX/kerosene rocket motor with total flow rate 120 g/s oxygen-fuel ratio 1:1. We measured axial temperature different positions combustor using thermocouples heat flux meter. found tha...