The interaction of the projectile with moving plates and rods

The study of the problem of protecting the elements of constructions from impact loadings is very important due to the need of constant perfection of the means of shock-wave impact on the objects of modern technology. The problem of creating a reliable protective system dictates necessity of studying different ways to counteract to high-velocity elongated projectiles. The interaction of projectiles with plates and rods which are thrown towards by HE is investigated. The strain and fracture of the projectile sharply reduce its penetrating ability

Numerical modelling of heat transfer during impact of a molten droplet on a surface

SPH-based numerical technique for modelling of impact of molten drops on a surface with heat transfer and phase transitions effects is proposed. Computational algorithm uses SPH with procedure of restoring of particle consistence and variational approach to calculation of acceleration field. Also, boundary algorithm for free and contact surfaces in 3D setting are develope

Determination of gas temperature in the plasmatron channel according to the known distribution of electronic temperature

An analytical method to calculate the temperature distribution of heavy particles in the channel of the plasma torch on the known distribution of the electronic temperature has been proposed. The results can be useful for a number of model calculations in determining the most effective conditions of gas blowing through the plasma torch with the purpose of heating the heavy component. This approach allows us to understand full details about the heating of cold gas, inpouring the plasma, and to estimate correctly the distribution of the gas temperature inside the channel

Optimization of the self-sufficient thorium fuel cycle for CANDU power reactors

The results of optimization calculations for CANDU reactors operating in the thorium cycle are presented in this paper. Calculations were performed to validate the feasibility of operating a heavy-water thermal neutron power reactor in a self-sufficient thorium cycle. Two modes of operation were considered in the paper: the mode of preliminary accumulation of 233U in the reactor itself and the mode of operation in a self-sufficient cycle. For the mode of accumulation of 233U, it was assumed that enriched uranium or plutonium was used as additional fissile material to provide neutrons for 233U production. In the self-sufficient mode of operation, the mass and isotopic composition of heavy nuclei unloaded from the reactor should provide (after the removal of fission products) the value of the multiplication factor of the cell in the following cycle K>1. Additionally, the task was to determine the geometry and composition of the cell for an acceptable burn up of 233U. The results obtained demonstrate that the realization of a self-sufficient thorium mode for a CANDU reactor is possible without using new technologies. The main features of the reactor ensuring a self-sufficient mode of operation are a good neutron balance and moving of fuel through the active core

INCREASING THE SOLUBILITY OF DIPYRIDAMOLE USING POLYETHYLENE GLYCOLS

Objective: The objective of the present study is a determination of the limiting solubility of dipyridamole in water and optimal ratios of polyethylene glycol:dipyridamole at which formation of solid dispersion is observed. Methods: UV-spectroscopy was used to determine the effect of polymer on limiting solubility of dipyridamole. Using low-temperature differential scanning calorimetry (DSC), it was made possible to obtain solid dispersions of dipyridamole with polyethylene glycols having average molecular weight 1000 and 1400. Results: The optimal ratio of polymer:Drug is 1:1, and is 3:1 for PEG-1000 and PEG-1400 respectively. Joint dissolution of dipyridamole with PEG-1400 and PEG-1000 increases the drug content in the water by up to 8.1 times and up to 175 times, compared with the solution containing only dipyridamole. Conclusion: using systems based on dipyridamole and polyethylene glycol with average molecular weight of 1000, may increase the bioavailability of the drug and consequently reduce the dosages. Wide range of ratios, in which the formation of solid dispersions is possible, enables to adjust the solubility of dipyridamole in neutral aqueous media

Thermomechanical analysis of large deployable space reflector antenna

In this article results of large reflector thermal condition forecast using modern numerical simulation methods are presented. The results of thermal analysis are complemented with stress-strain analysis results of the whole structure under thermal loads