Uzhhorod National University

About: Uzhhorod National University is a education organization based out in Uzhhorod, Ukraine. It is known for research contribution in the topics: Raman spectroscopy & Laser. The organization has 1089 authors who have published 1056 publications receiving 5187 citations. The organization is also known as: State Higher Education Establishment "Uzhhorod National University" & Uzhhorod State University.

Study of the Boundary Value Problems for Nonlinear Wave Equations on Domains with a Complex Structure of the Boundary and Prehistory

Abstract: We study a boundary value problem for nonlinear partial differential equations of the hyperbolic type on the plain in a domain with a complex boundary. To find the missing data for the given boundary constraints, we solve a supplementary nonlinear problem. For the approximation of solutions, one constructive method is built.

National resilience in democracy: Ukrainian experience

Abstract: The actuality and importance of this issue are due to the fact that ensuring resilience of the nation and the country and modern development of democratic societies requires synergistic activities and effective dialogue between public authorities and citizens to understand the problems and needs of the state and society, especially under rapidly changing turbulent conditions. The purpose of this article is to identify the main threats to Ukraine and clarify the definition of national resilience, understanding that the basis of the interface between national security and national resilience is the human perception of these problems, including their relationship to the government and administrative institutions. The leading approach to the study of this issue was content analysis, which allowed to provide the main answers, in accordance with the goal – to identify the main threats and clarify the concept of national resilience; statistical methods were also used – combined methods of data collection and processing, such as generalization and systematization, processing of sociological information, assessment of distribution patterns, graphical method, etc. The article reveals that the main threats to Ukraine among the Ukrainian student youth are considered to be the internal challenges of governing society, external threats to territorial integrity and economic danger; at the same time, we update the concept of national resilience, emphasizing the most commonly used components, such as the ability of nations and countries to successfully overcome internal and external threats, while maintaining patriotic spirit and national identity, given the high level in quality of life in a socially independent country. This article has practical value for rethinking the term “national security” and “national resilience”, according to their characteristics, bringing the quality of the results of this concept to the most satisfactory for both the state and its citizen. Thus, the development of necessary measures of resilience in Ukraine can be directed; the results of the article can be used by scientists, practitioners, government officials, civil society for the development and implementation of this concept in Ukraine and be a basis for further study of this concept in other democracies

Changes in the level of α1-antitrypsin in patients with non-alcoholic fatty liver disease.

Abstract: OBJECTIVE The aim: To investigate changes in the level of α1-antitrypsin (A1AT) in blood and in stool and their diagnostic value in patients with NAFLD and with impaired carbohydrate metabolism at different stages of liver damage. PATIENTS AND METHODS Materials and methods: 34 patients with non-alcoholic fatty hepatosis (NAFH) and 40 patients with non-alcoholic steatohepatitis (NASH) were examined. Enzyme-linked immunosorbent assay for all patients with serum and coli was performed by determining the level of A1AT. RESULTS Results: In patients with NAFLD, in combination with IR, the level of A1AT in the blood plasma is only 1.6 times higher than that of the control group (p <0.05), and in the case of combination of NAFH and type 2 diabetes mellitus (T2DM) - it is 2 times higher (p <0.05). In patients with NASH in combination with insulin resistance (IR), the level of A1AT in the serum was 4.1 times higher than in the control group, and for NASH and type 2 diabetes - 4.2 times. CONCLUSION Conclusions:The level of A1AT in the blood plasma increases proportionally to the degree of progression of liver damage (from the minimum values at NAFH to the maximum at NASH), regardless of the type of carbohydrate metabolism disturbance. The combination of NAFLD and T2DM is accompanied by a more pronounced increase in A1AT in stool and α1-antitrypsin clearance than the combination of NAFLD and IR.

Description of electrons correlation in1,3S-states of negative ion of positronium

Abstract: The energy of ground1,3S-states of negative positronium ion in the hyperspherical coordinates method has been calculated in Born-Oppenheimer and adiabatic approximations accounting the contribution of angle and radial correlation. Quasi-crossing points for autodetaching adiabatic potentials were revealed, which forms a structure in nonadiabatic potential. The received energy values have been compared with results of calculations performed using other methods. It was shown that in order to receive energy values with accuracy of 10−4 a.u. it is necessary to include more than 70 elements into the basis for determination of adiabatic potentials or to use Pade approximation on the basis dimension.

Fine structure of the diffraction cone: manifestation of t channel unitarity

Abstract: We show that the deviation from exponential behavior of the diffraction cone observed near t=-0.1 GeV^2 both at ISR and the LHC (so-called break) follows from a two-pion loop in the t channel, imposed by unitarity. By using a simple Regge-pole model, we extrapolate the "break" from the ISR energy region to that of the LHC.