- 21. Forceful interaction of the casing string with the walls of a curvilinear well
- (Content №4 2022)
- ... elastic rod in the curved well. An inhomogeneous system of four differential equations is developed to describe the rods deformations. It was reduced to a first-order differential equation with respect ...
- Created on 29 August 2022
- 22. Optimization of heating efficiency of buildings above underground coal mines by infrared heaters
- (Content №3 2022)
- ... The results are presented in the form of graphs and nomograms, as well as approximated by their analytical equations. The annual economic effect of the optimal variant of combined heating system due to ...
- Created on 29 June 2022
- 23. On the mechanism of ionization of atoms at compression of a substance by front of the converging shock wave
- (Content №3 2022)
- ... (1984). Explosion in a limited volume of gas under strong radiation. Prikladnaya matematika i tekhnicheskaya fizika, (6), 108-112. 46. Nedostup, V.I., & Galkevich, Ye.P. (2000). Equations of state ...
- Created on 29 June 2022
- 24. Complex measurement of parameters of iron ore magnetic separation based on ultrasonic methods
- (Content №3 2022)
- ... the Rozin-Rammler equation for the characteristics of the ore material at various points of the technological line were calculated. Originality. The proposed method of ultrasonic measurement of characteristics ...
- Created on 29 June 2022
- 25. Mineralogical and granulo-chemical characterization of veins 4 and 10, of Ain Mimoun baryte ore mine
- (Content №3 2022)
- ... American Mineralogist, 92, 1-18. https://doi.org/10.2138/am.2007.2170. 13. Hargreaves, J.S.J. (2016). Some considerations related to the use of the Scherrer equation in powder X-ray diffraction as applied ...
- Created on 29 June 2022
- 26. Determination of the stability of a three-layer shell of a traveling wheel with light filler
- (Content №2 2022)
- ... of critical external pressure. Methodology. When determining the critical external pressure, the method of variational calculation using the Euler equation of the mixed variational problem was used. To ...
- Created on 30 April 2022
- 27. Optimization of the management system for mitigating the consequences of water area pollution during the crisis
- (Content №6 2021)
- ... obtained in the course of the study are approximated by a polynomial equation, making it possible to evaluate the effectiveness of using the proposed method depending on the number of nodes of the information ...
- Created on 29 December 2021
- 28. Improvement of modeling techniques of transients in transformers based on magnetoelectric equivalent schemes
- (Content №6 2021)
- ... Approximation of functions by Chebyshevs polynomials, numerical methods of differential equations integrating, matrix methods, spline interpolation, programming, theory of electric and magnetic circuits. ...
- Created on 29 December 2021
- 29. Analyzing and identifying the limits of 660V grid parameters to ensure electrical safety in underground coal mines
- (Content №6 2021)
- ... may be used to operate the electric system safely and effectively. Originality. The proposed equations and simulation in Matlab may be applied to all underground mining grids with different input parameters. ...
- Created on 29 December 2021
- 30. High-frequency periodic processes in two-winding power transformers
- (Content №6 2021)
- ... periodic processes in transformers and methods of solving systems of partial differential equations are applied. Findings. The mathematical model for the research of high-frequency periodic processes in ...
- Created on 29 December 2021
- 31. Mathematical modeling of wave processes in two-winding transformers taking into account the main magnetic flux
- (Content №5 2021)
- ... and further development of the analytical method for solving the system of partial differential equations. Findings. A mathematical model for the research on wave processes in power two-winding transformers ...
- Created on 29 October 2021
- 32. Determination of vertical dynamics for a standard Ukrainian boxcar with Y25 bogies
- (Content №5 2021)
- ... (design) dimensions of the carrying elements and a boxcar with the actual dimensions (after a long service life) on the basis of the field tests. The differential equations were solved by theRungeKutta ...
- Created on 29 October 2021
- 33. Increasing the sensitivity of measurement of a moisture content in crude oil
- (Content №5 2021)
- ... with a negative differential resistance. Findings. Analytical expressions are obtained to describe the dielectric constant of an inhomogeneous mixture of water and oil. Using these equations, the capacitance ...
- Created on 29 October 2021
- 34. Analysis of stress in the conveyor belt (Maxwell–element model)
- (Content №4 2021)
- ... arising in the conveyor belt, the apparatus of mathematical physics was used. Findings. A wave equation is written that determines the propagation of longitudinal vibrations in a conveyor belt, the material ...
- Created on 23 August 2021
- 35. Definition of rational operating modes of a vibratory jaw crusher
- (Content №4 2021)
- ... environment. In the motion equations of the crusher the material is taken into account on the basis of a discrete model by a continual parameter. Findings. A physical model is developed on the basis of ...
- Created on 23 August 2021
- 36. Mathematical model of the process of drying fine dispersed materials under the influence of alternating electric current
- (Content №3 2021)
- ... is designed connecting temperature and moisture content in a plate from capillary-porous material by means of equations of mathematical physics. Originality. For the first time dependence has been obtained ...
- Created on 23 June 2021
- 37. Determination of stress concentration near the holes under dynamic loadings
- (Content №3 2021)
- ... loads with controlled accuracy. Methodology. The study was carried out on the basis of the Laplace transform and the method of integral equations. Findings. An approach to determining the dynamic stresses ...
- Created on 23 June 2021
- 38. Analysis of the regression model of the enterprise’s financial activity by research on residual error
- (Content №2 2021)
- ... of regression equations. Originality. For the first time, the application of residual error analysis as a random variable has been proposed in order to construct its conditional differential distribution ...
- Created on 29 April 2021
- 39. Dynamic loads in self-aligning gear transmissions of heavy loaded machines
- (Content №1 2021)
- ... process. Methodology. The calculation schematic and equations of the relative motion of the self-aligning drive gear are formed using the methods of rigid body dynamics. Analytical expressions for the ...
- Created on 05 March 2021
- 40. Direct method of studying heat exchange in multilayered bodies of basic geometric forms with imperfect heat contact
- (Content №1 2021)
- ... based on the reduction method, the concept of quasiderivatives, a system of differential equations with impulse action, the method of separation of variables, and the modified method of eigenfunctions ...
- Created on 05 March 2021