- 41. Experimental research on hydraulic resistance of deformed woven meshes
- (Contens №5 2020)
- ... angle is refined using the obtained dependence for the shape factor. The methodology consists in the multiplication of the hydraulic resistance coefficient, that is calculated on the basis of the dependences ...
- Created on 30 October 2020
- 42. Impact of duration of mechanochemical activation on enhancement of zinc leaching from polymetallic ore tailings
- (Contens №5 2020)
- ... Polynomial dependences have been established that make it possible to calculate the degree of zinc extraction from the tail, depending on the parameters of the process of the leached solution, the ratio ...
- Created on 30 October 2020
- 43. Impact of water saturation effect on sedimentary rocks strength properties
- (Contens №4 2020)
- ... rates of water saturation; regression dependences of the strength loss for sedimentary rocks depending on the water content in rock samples were plotted. The values of cohesion C and the angle of internal ...
- Created on 30 August 2020
- 44. Synthesis and research of the tumbling machine spatial mechanism
- (Contens №4 2020)
- ... drive is developed, which allows for the rotation of the machine drive shaft with simultaneous reciprocating movements; mathematical dependences for calculating the main structural parameters are obtained ...
- Created on 30 August 2020
- 45. Efficiency of underground gas generator in consideration of the reverse mode
- (Contens №4 2020)
- ... generator gases on the outlet from the modeled underground gas generator. Originality. Dependences of the changes in displacements of the active underground gas generator zones in terms of the implemented ...
- Created on 30 August 2020
- 46. Paradoxes of economic development: science and innovation in the modern world
- (Contens №2 2020)
- ... Practical value. The determined variability of the effect of science on the economic growth approves the understanding of ambiguousness and nonlinearity of the process; thus, it requires constant empiric tests of the available dependences and searching for new influences depending on the stage of civilization process which different countries experience. All that helps substantiate the fundamentals of economic policy of national governments in their favouring social and economic development by selecting more effective leverages. ...
- Created on 10 May 2020
- 47. Calculation of static and dynamic losses in power IGBT transistors by polynomial approximation of basic energy characteristicss
- (Contens №2 2020)
- ... Methodology. Polynomial approximation of the energy dependences of IGBT-transistors using the least squares method. Simulation in Matlab/Simulink. Power loss calculation with MelcoSim 5.1. ...
- Created on 10 May 2020
- 48. The influence of the moisture on the physical and mechanical properties of the sandstone (Separate Unit “Kapitalna” coal mine”, Donbas)
- (Contens №2 2020)
- ... Originality. The empirical dependences of mechanical properties from gravimetric moisture capacity of the sandstone sample were determined on the basis of the experiments in the laboratory. The regression power function was obtained for stress limit and modulus of elasticity, and for the coefficient of lateral deformation it was logarithmic. The coefficient of lateral deformation at the time of the destruction of some wet samples exceeded theoretically acceptable value of 0.5. ...
- Created on 10 May 2020
- 49. Mathematical model of oscillations of a drill tool with a drill bit of cutting-scraping type
- (Content №1 2020)
- ... out. The frequency of change in these non-stationary drilling mode functions is set by rapid Fourier transform. Originality. For the first time, analytical dependences were obtained to determine ...
- Created on 10 March 2020
- 50. Thermodynamic aspect of rock destruction
- (Content №1 2020)
- ... parameters characterizing the state of rocks are established. A comparative analysis of the frequency dependences of free energy on the value of the Poisson ratio is carried out. Originality. A ...
- Created on 10 March 2020