- 41. 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
- 42. 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
- 43. 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
- 44. 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
- 45. 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
- 46. Results of testing and modelling the “drilling rig with hydraulic vibrator ‒ rock” system
- (Content №1 2020)
- ... presented in the form of estimated dependences of the peak-to-peak values of fluid pressure oscillations and vibrational accelerations of rock-breaking tool on the value of cavitation parameter and their ...
- Created on 10 March 2020
- 47. Control of the belt speed at unbalanced loading of the conveyor
- (Contens №6 2019)
- ... defined by linear density of material disposition along the transportation route. Dependences for the material linear density and material flow for the steady state condition are defined. The performance ...
- Created on 23 December 2019
- 48. Efficiency of application of antipyrogenic materials for coating coals and coke
- (Contens №6 2019)
- ... the first time, the dependences of the safety of fractions and technical parameters of Shubarkol coal and special coke in stacks on the use of different flame retardants over time have been established. ...
- Created on 23 December 2019
- 49. Energy-saving control for traction frequency-regulated asynchronous engine of an electric vehicle
- (Contens №6 2019)
- ... regimes. Dependences are obtained which allow determining the energy-saving values of the speed of an electric vehicle in steady-state regimes. Practical value. The application of the obtained results ...
- Created on 23 December 2019
- 50. Energy effectiveness of the differential of a device for speed change through the sun gear
- (Contens №6 2019)
- ... are obtained. Findings. The obtained graphic dependences for the performance efficiency of three- and four-stage gears differentials allow one to follow visually the change in the value of the ...
- Created on 23 December 2019