https://dspace.chmnu.edu.ua/jspui/handle/123456789/803 Mon, 03 Aug 2026 22:35:44 GMT 2026-08-03T22:35:44Z http://dspace.chmnu.edu.ua:80/jspui/retrieve/0918f5c2-c20f-4fbf-ba08-2f575d1934ca/БД.png https://dspace.chmnu.edu.ua/jspui/handle/123456789/803 https://dspace.chmnu.edu.ua/jspui/handle/123456789/3346 Title: The true orthodox church in the scientific discourse of the second half of the 20th – the first quarter of the 21st century Authors: Trygub, O.; Buhlai, N. Abstract: The phenomenon of the True Orthodox Church (TOC), also known as the "catacomb church", belongs to the complex and controversial plots of the history of Orthodoxy in the 20th century, as it arose in the context of the radical transformation of state-church relations after the 1917 revolution and the formation of opposition among some of the clergy and laity to the policy of loyalty of Moscow Patriarchate towards the Soviet government. The long-term illegal existence of underground Orthodox communities, the limited nature of the source base, and the ideological bias of early research led to the uneven development of scientific understanding of this phenomenon. The purpose of the article is to critically analyze the main stages and directions of studying the True Orthodox Church, to compare key research approaches, and to identify prospects for further studies. The methodological basis of the study is a complex of principles of historicism, problematics, and interdisciplinarity using special historical methods-historical comparative, problematic chronological, and historiographic analysis. The scientific novelty of the article consists in the systematization of the main directions of studying the TOC in the Soviet, Russian, and Ukrainian historiography, a critical comparison oftheirmethodological approaches and source capabilities, as well as in determining the specifics of the Ukrainian research tradition formation in this area. Conclusions. The analysis of historiography shows that the study of the True Orthodox Church was formed gradually and unevenly. The Soviet historiography considered underground Orthodox groups mainly through the prism of the states' anti-religious policy and did not form a coherent scientific concept of the TOC, although it accumulated a significant empirical material. A new stage began after the opening of archives in the 1990s, when the Russian researchers introduced a significant array of documents of repressive bodies into scientific circulation and initiated a systematic study of the catacomb movement. Since the 1990s the Ukrainian historiography has gradually formed its own research tradition, based mainly on archival and investigative materials and regional studies. At the same time, the issue under study remains insufficiently generalized: a significant part of the sources has not yet been introduced into scientific circulation, and regional studies require synthetic understanding. Further studies should be aimed at expanding the source base, clarifying the conceptual and terminological apparatus, and creating generalizing studies that will enable scholars to make a holistic reconstruction of the history of the TOC in the context of church life in the Soviet era. Description: Trygub, O., & Buhlai, N. (2026). The true orthodox church in the scientific discourse of the second half of the 20th – the first quarter of the 21st century. Skhidnoievropeiskyi Istorychnyi Visnyk-East European Historical Bulletin, (39), 179–196. DOI : 10.24919/2519-058X.39.365002 Thu, 01 Jan 2026 00:00:00 GMT https://dspace.chmnu.edu.ua/jspui/handle/123456789/3346 2026-01-01T00:00:00Z https://dspace.chmnu.edu.ua/jspui/handle/123456789/3345 Title: Stochastic Optical Variability and an rms–Flux Relation in the Intermediate Polar EP240309a Authors: Guziy, S. et al. Abstract: Magnetic cataclysmic variables provide a natural laboratory for studying how accretion interacts with compact-object magnetospheres and generates stochastic variability. We present an optical variability study of the intermediate-polar candidate EP240309a, an Einstein Probe X-ray transient, using BOOTES photometry, high-cadence TESS light curves, and a Southern Astrophysical Research (SOAR)/Goodman optical spectrum. Previous studies found a white-dwarf spin period of 3.97 minutes (Pspin similar or equal to 238 s) and an orbital period of Porb = 3.7614(4) hr. Power spectral densities from the BOOTES data are consistent with single power laws with slopes alpha similar or equal to 1.2-1.8, with no statistically significant evidence for a bend across the sampled frequency range. Using red-noise simulations and injection-recovery tests, we place one-sided constraints on any putative break frequency, which translate, under standard dynamical identifications, into an upper limit on the magnetospheric radius of Rm less than or similar to few & times; 1010 cm for MWD = 0.8 M circle dot. In the TESS data, we detect a linear rms-flux relation on hour timescales in three high-cadence sectors, while two other sectors do not show a robust detection, indicating epoch-dependent rms-flux behavior. The SOAR spectrum shows Balmer and He ii emission lines with FWHM approximate to 1000-1600 km s-1; under a Keplerian interpretation, these imply characteristic radii of r approximate to (0.9-3.4) & times; 1010 cm, broadly comparable to the timing-based constraints. Overall, the data provide conservative, order-of-magnitude radius constraints consistent with accretion onto a magnetic white dwarf, but they do not establish the detailed accretion geometry or exclude stream-fed or mixed accretion scenarios. Description: Wu, S. Y., Hu, Y. D., Pérez-García, I., Castro-Tirado, A. J., Gritsevich, M., Fernández-García, E. J., ... & Zhang, B. B. (2026). Stochastic Optical Variability and an rms–Flux Relation in the Intermediate Polar EP240309a. The Astrophysical Journal Supplement Series, 284 (2), 36. DOI : 10.3847/1538-4365/ae5a2c Thu, 01 Jan 2026 00:00:00 GMT https://dspace.chmnu.edu.ua/jspui/handle/123456789/3345 2026-01-01T00:00:00Z https://dspace.chmnu.edu.ua/jspui/handle/123456789/3344 Title: Sustainable Iodometric Assessment of Electric Discharge Cavitation for Eco-Friendly Water Purification Authors: Malyushevskaya, A. P.; Mitryasova, O.; Koszelnik, M.; Šalamon, I.; Mats, A.; Domoń, A.; Sočo, E. Abstract: Electric discharge cavitation is an effective method for water treatment that combines physical and chemical effects within a single process. It enables water disinfection, extraction acceleration, dispersion of solid particles, and enhancement of porous material permeability. Compared to conventional chemical treatment, it reduces the demand for reagents and minimizes secondary pollution. This new and developing technology significantly contributes to the preservation of natural aquatic ecosystems by providing a sustainable alternative to traditional decontamination methods, thereby reducing the overall anthropogenic pressure on the environment. This study focuses on developing a reliable method for assessing electric discharge cavitation intensity and controlling water purification processes. The proposed approach is based on the oxidation of iodide ions to molecular iodine by reactive species generated during electric discharge cavitation. The adapted iodometric method is sensitive, reproducible, and does not require complex optical or acoustic equipment. Experimental results confirmed that iodometry provides an accurate evaluation of cavitation intensity, allowing control of specific energy consumption and optimization of treatment parameters. Optimal operating conditions were established to control the water processing by electric discharge cavitation: stainless-steel electrodes, specific input energy not exceeding 280 kJ·L−1, the presence of a free liquid surface in the working chamber, and a discharge pulse frequency below 10 Hz. The proposed method supports the development of energy-efficient, low-waste technologies for wastewater and natural water treatment and facilitates the integration of electric discharge systems into existing water treatment infrastructure, particularly under resource-limited conditions. Description: Malyushevskaya, A. P., Mitryasova, O., Koszelnik, M., Šalamon, I., Mats, A., Domoń, A., & Sočo, E. (2026). Sustainable Iodometric Assessment of Electric Discharge Cavitation for Eco-Friendly Water Purification. Processes, 14 (8), 1271. DOI : 10.3390/pr14081271 Thu, 01 Jan 2026 00:00:00 GMT https://dspace.chmnu.edu.ua/jspui/handle/123456789/3344 2026-01-01T00:00:00Z https://dspace.chmnu.edu.ua/jspui/handle/123456789/3343 Title: International legal mechanisms for ensuring public security and protecting public order under martial law Authors: Zakharchenko, A.; Varenyk, O.; Pidbereznykh, I.; Vykhrystiuk, A.; Verbytsky, V. Abstract: This study examines international legal mechanisms for ensuring public security and protecting public order during the implementation of martial law. The relevance of the research arises from the increasing frequency of emergency regimes in contemporary geopolitical conflicts and the need to balance state security measures with international human rights obligations. The purpose of the study is to analyse how international legal instruments influence the regulation of public security and law enforcement activities under martial law in different jurisdictions. The research applies a comparative legal approach combined with case study analysis and the examination of statistical indicators of crime rates and public order violations. The empirical scope includes Ukraine, Turkey, Thailand, Pakistan, and the Philippines, which represent diverse geopolitical and legal contexts of martial law implementation. The findings indicate that the introduction of martial law is often associated with changes in crime rates and public order violations; however, these dynamics vary significantly depending on institutional capacity, duration of emergency measures, and the level of political conflict. The analysis demonstrates that international legal frameworks, including human rights conventions and international humanitarian law, provide normative safeguards, yet their practical implementation remains uneven across national systems. The study highlights the importance of strengthening judicial oversight, improving coordination between civilian and military authorities, and harmonizing national legislation with international legal standards. These findings contribute to the development of more effective legal mechanisms for maintaining public security during emergency regimes while safeguarding fundamental rights. Description: Zakharchenko, A., Varenyk, O., Pidbereznykh, I., Vykhrystiuk, A., & Verbytsky, V. (2026). International legal mechanisms for ensuring public security and protecting public order under martial law. Cadernos de dereito actual, (31), 373–390. Thu, 01 Jan 2026 00:00:00 GMT https://dspace.chmnu.edu.ua/jspui/handle/123456789/3343 2026-01-01T00:00:00Z