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.

Infralow-Frequency Mechanical Properties of Sn2P2S6 Single Crystal

Abstract: Temperature-frequency dependences of internal friction Q−1 and shear modulus G of Sn2P2S6 single crystals are studied within the temperature interval 300–370 K and frequency range 5–100 mHz at different amplitudes of the external field. In the range of the second-order phase transition anomalous behaviour of these parameters, namely an asymmetric maximum of the internal friction and a step in the shear modulus, is observed. The intensity of these anomalies increases at the decrease of the exciting field frequency. The increase of the external field amplitude results in the smearing of the Q−1 and G anomalies and the decrease of their intensity along with the increase of the mechanical loss level in the paraelectric phase. The mechanical loss in the ferroelectric phase is shown to result mainly from the domain mechanism, while in the paraelectric phase losses are related to the detachment of dislocations from the point defects which fixed them.

Optical Characteristics of Laser-Produced Antimony Plasma

Abstract: The processes occurring in expanding laser-produced antimony plasma are investigated by the emission spectroscopy method. The plasma expansion velocity, the recombination time of SbII, and the electron temperature and density are determined from the dynamics of SbI line emission. Based on the results obtained, the processes occurring during the formation and expansion of laser-produced antimony plasma are qualitatively analyzed.

Application of the excited state model to chalcogenide glasses

Abstract: The limiting displacement of an atom (a group of atoms), which corresponds to the maximum of the interatomic interaction force, is treated as a process of atomic excitation in liquids and glasses. The formation, migration, and disappearance of excited atoms are caused by local fluctuations of the configurational entropy. These processes in chalcogenide (and other) glasses are considered small-scale low-energy processes. The parameters of the excited state model as applied to oxygen-free inorganic systems are analyzed.

The reporting of the mode of transmission among HIV-positive men who have sex with men in Lviv oblast, Ukraine, 2014-2018.

Abstract: INTRODUCTION Men who have sex with men (MSM) are one of the key populations driving HIV/AIDS epidemic globally. To date, MSM is the only population in Ukraine where the prevalence and incidence of HIV is increasing. As HIV-positive MSM might feel uncomfortable to report homosexual intercourses as a possible mode of transmission (MoT) of HIV, they prefer being registered as patients with heterosexual or non-defined MoT. This study aimed to calculate the proportion of misclassified MoT among HIV-positive MSM registered in Lviv oblast, Ukraine, during 2014-2018. METHODOLOGY Cross-sectional study with 127 HIV-positive MSM patients from Lviv region for the period of 2014-2018. RESULTS Out of 127 HIV-positive MSM included in the study, 110 (86.6%) were from urban areas. In addition, 52 patients (40.9%) were diagnosed with stage 1 HIV, 16 (12.6%) - stage 2, 19 (15%) - stage 3, and 36 (28.3%) - stage 4. CD4 count < 200 cells/μL was found in 35 (27.6%) patients. Mean time from registration to antiretroviral therapy initiation was 80 days. During the first visit to medical doctor out of those 48 patients who had previously reported "other modes" of HIV transmission, 33 patients (68.7%) disclosed homosexual MoT of HIV. The remaining 15 (31.3%) patients disclosed their homosexual MoT of HIV later - during their regular follow-up visits to the doctor. CONCLUSION Special measures are needed to improve the reporting of homosexual MoT which can potentially strengthen the HIV care among MSM.