DSpace Зібрання:https://repository.hneu.edu.ua/handle/123456789/335082026-05-31T20:39:19Z2026-05-31T20:39:19ZMathematical modeling of thermomechanical fields in shell structures subjected to thermal influenceSmetankina N.Misiura Ie.Misiura S.https://repository.hneu.edu.ua/handle/123456789/402242026-05-28T21:31:21Z2026-01-01T00:00:00ZНазва: Mathematical modeling of thermomechanical fields in shell structures subjected to thermal influence
Автори: Smetankina N.; Misiura Ie.; Misiura S.
Короткий огляд (реферат): This paper investigates thermomechanical processes in shell structures subjected to thermal influence and their effect on the stress-strain state of materials. A mathemati-cal model of thermoelastic deformation is proposed, where the nonlinear problem is solved by the method of successive approximations and reduced to a sequence of lin-ear parabolic equations. The developed approach allows the analysis of thermal stresses and the determination of optimal thermal loading parameters to improve the reliability of shell structures.2026-01-01T00:00:00ZComparative analysis of telecommunications and information services exports as a factor of sustainable industrial development in Ukraine and the EUNorik L. O.https://repository.hneu.edu.ua/handle/123456789/401952026-05-27T14:05:30Z2026-01-01T00:00:00ZНазва: Comparative analysis of telecommunications and information services exports as a factor of sustainable industrial development in Ukraine and the EU
Автори: Norik L. O.
Короткий огляд (реферат): The dynamics and structural features of telecommunications, computer, and information services exports in Ukraine and the EU over the period 2010–2024 are analyzed in the context of the digital economy. The level of integration is assessed using the share of exports in GDP, and the statistical significance of differences is tested using the Student’s t-test. The results indicate comparable levels of development; however, differences in export structure are evident: the EU shows a more diversified structure, while Ukraine shows a concentration in computer services.2026-01-01T00:00:00ZSemi-empirical universal model of heat capacity based on the Laplace distributionYilmaz N. N.Kozub P. A.Revyakina M. G.Kozub S. N.Revyakin G. V.Ulyanov N. V.Lukianova V. A.Norik L. O.Cherneva V. E.https://repository.hneu.edu.ua/handle/123456789/401062026-05-21T08:42:39Z2026-01-01T00:00:00ZНазва: Semi-empirical universal model of heat capacity based on the Laplace distribution
Автори: Yilmaz N. N.; Kozub P. A.; Revyakina M. G.; Kozub S. N.; Revyakin G. V.; Ulyanov N. V.; Lukianova V. A.; Norik L. O.; Cherneva V. E.
Короткий огляд (реферат): A semi-empirical universal model describing the temperature dependence of heat capacity is developed using the Laplace distribution as a physical basis and its log-logistic analogue as an analytical form. The proposed formulation unifies the classical Debye, Einstein, and Tarasov approaches and provides an accurate representation of experimental data for solids, liquids, and gases over the entire temperature range of their stability. The model has only two parameters: the characteristic temperature and the rate of change of state, which correlate with the Debye temperature and the structural dimensionality of the substance. Analytical expressions derived from the model allow direct calculation of enthalpy and entropy without numerical integration. The log-logistic form preserves approximation accuracy within the uncertainty of measurements while enabling analytical differentiation and integration of thermodynamic functions. The proposed system of functions offers a unified, physically consistent, and computationally efficient framework for evaluating and predicting the heat capacity and related thermodynamic properties of materials.2026-01-01T00:00:00ZStability analysis of shell structures with openingsSmetankina N.Misiura S.Ie. MisiuraMisiurahttps://repository.hneu.edu.ua/handle/123456789/401052026-05-20T19:43:08Z2026-01-01T00:00:00ZНазва: Stability analysis of shell structures with openings
Автори: Smetankina N.; Misiura S.; Ie. MisiuraMisiura
Короткий огляд (реферат): Thin-walled cylindrical shells with cutouts are widely used in engineering structures due to their high strength-to-weight ratio, although the presence of openings consid-erably complicates stability analysis. This paper presents a method for studying the local stability of cylindrical shells with a single circular cutout, enabling the exact sat-isfaction of boundary conditions and the determination of critical loads, local buck-ling modes, and the influence of geometric and material parameters on shell behavior.2026-01-01T00:00:00Z