bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study of the Fenton Oxidative Reaction on a Culture of Human Fibroblast Cells Incubated with Ablated CeO<sub>2</sub> Particles
Authors: Pugachevskii M. A. , Kryukov A. A. , Dodonova S. A. , Artyushkova E. B. , Mamontov V. A. , Rodionov V. V. 
Published: April 2024

Purpose. Study of the bioprotective properties of ablated cerium dioxide nanoparticles in relation to immortalized human fibroblasts under conditions of oxidative stress caused by the Fenton reaction.Methods. Cerium dioxide nanoparticles with pronounced antioxidant properties were obtained using laser ablation. The average maximum sizes of ablated particles of oxidized cerium in non-centrifuged and centrifuged at a speed of 1000 rpm nanodispersed aqueous solutions were revealed using the method of atomic force microscopy. The spectrophotometric method revealed that ablated cerium dioxide nanoparticles exhibit antioxidant properties and prevent the degradation of the methylene blue dye during the Fenton reaction. Cell culture samples were mapped using scanning electron microscopy using an energy-dispersive attachment after their incubation with ablated cerium dioxide nanoparticles. Using MTT analysis, the effect of ablated cerium dioxide nanoparticles on the survival of BJ TERT cell culture in the Fenton reaction was studied. Non-centrifuged and centrifuged at a speed of 1000 rpm nanodispersed solutions of oxidized cerium were used. The antioxidant activity of cerium dioxide nanoparticles after 6- and 24-hour incubation was studied.Results. The average limiting sizes of ablated cerium dioxide nanoparticles have been established, the values of which are (61,95±0,1) nm for a non-centrifuged aqueous solution and (56,59±0,1) nm for an aqueous solution centrifuged at a microcentrifuge speed of 1000 rpm. It was revealed that in the presence of ablated cerium dioxide nanoparticles, the degree of oxidative degradation of methylene blue during the Fenton reaction was significantly reduced. It was found that with an increase in the concentration of ablated cerium dioxide nanoparticles from 20 to 1000 mg/l, their antioxidant effect increased. From the obtained SEM images of cell cultures with ablated cerium dioxide nanoparticles, it follows that the nanoparticles are captured by cells during incubation and can have a significant effect on oxidative processes during the Fenton reaction. Statistical analysis based on the results of the MTT assay showed that 6-hour and 24-hour incubation with ablated cerium dioxide nanoparticles had a pronounced protective effect on the BJ TERT cell line.Conclusion. This work shows that during the Fenton reaction, cerium dioxide nanoparticles prevent the oxidative degradation of the methylene blue dye. When immortalized human fibroblasts are incubated, ablated cerium oxide nanoparticles are taken up by the cells and have a significant protective effect on them in the oxidative reaction. The high antioxidant activity of nanoparticles is determined by the high content of functional defects on the surface of nanoparticles obtained under sharply nonequilibrium conditions of laser ablation.
Mesomorphism and Tribotechnical Characteristics of Lubricant Compositions with Mesogenic Additives Carboxylates Cu(II)
Authors: Elnikova L. V. , Ponomarenko A. T. , Shevchenko V. G. 
Published: April 2024

The purpose of the work is to characterize the lubricants based on Llitol-24 and synthetic solidol with additives copper(II) carboxylates when using them in friction nodes in loading conditions and temperature. The lubricant compositions with additives copper(II) carboxylates based on synthetic solidol and Litol-24 form the columnar mesophases depending on thermodynamical conditions and concentration of additives.Methods. We study the lubricant compositions with dielectric spectroscopy and и polarization light microscopy. The studies lubricant compositions are tested on the frictional machines by preceding authors, which performed their synthesis and numerical estimations for their geometry parameters. It is shown, that the columnar mesophase formed by the compositions with copper(II) carboxylates simulates favourable tribological conditions for lubrication (reduction of the friction coefficient at the appointed range of additive concentrations and reduction of wear) and unlike to crystalline phases, shows orientation effects at the surface of interacting surfaces of machine elements and devices. These factsmotivate the study of influence of physicochemical properties and composition on mesomorphism of considered lubricant compositions.Results. In our measurements, we found the main dielectric characteristics of two kinds of the lubricant compositions: dielectric constant and dielectric loss, electroconductivity, dissipation factor, the Arrhenius functions are plotted, and the activation energies of the lubricant compositions we study are calculated. The microphotogram for textures of the lubricant compositions depending on temperature and concentrations are received. The differences in mesomorphic properties of the lubricant compositions with additives Cu(II) valerate and isovalerate are confirmed.The conclusion of the work is that the composition of the lubricant is optimized by the choice of additive concentration, the length of the mesogenic chain of the copper(II) carboxylate molecule and its conformation.
Effect of Ce<sup>3+</sup> Concentration and YAG Crystal Particles Size on Photoluminescence
Authors: Novikov Е. А. , Kuzmenko A. P. , Rodionov V. V. , Emelyanov V. M. , Anikin D. P. , Neruchev Yu. A. 
Published: April 2024

Purpose of research. Determine the effect on the photoluminescence of phosphors from yttrium-aluminum garnet activated by cerium ions Ce3+, the size of its particles and the concentration of cerium ions in them.Methods. Structural electron and confocal microscopic, fluorescent, microspectral studies using a laser lex = 473 nm as an excitation source, energy dispersive, X-ray diffraction studies, as well as goniophotometric measurements on the radial distribution of light intensity excited by the LED matrix were carried out.Results. A detailed granulometric analysis of the particle sizes of phosphors was carried out for two samples from different manufacturers, cumulative distributions M(d) were constructed and their quantiles were established. Based on the results of measuring photoluminescence from individual particles in the compositions of phosphors based on YAG:Ce3+, a Stokes shift was detected in these samples: short-wavelength – for particles with sizes less than 10 μm and with low concentration and long-wavelength – with sizes greater than 10 μm with an increased concentration of over ~0.2% . The obtained microspectral size-emission dependences lem(d) and energy Imax(d) were consistent with the description based on the proposed physical mechanism of their formation by the 5d → 2F5/2 and 5d → 2F7/2 transitions.Conclusion. A short-wavelength shift of photoluminescence intensity maxima for particles smaller than 10 μm was discovered, due to a significant increase in the influence of surface stresses due to a reduction in the number of atoms. For larger particle sizes, the characteristic photoluminescence intensity maxima cease to depend on the wavelength. The radial distribution of luminous intensity determined by the goniophotometric method made it possible to calculate the value of the luminous flux equal to 1350 lm and 1140 lm, respectively, for LED matrices containing 8 LEDs with the studied phosphors.
Investigation of the Elemental Composition of Titanium Metal Waste by X-Ray Fluorescence Analysis
Authors: Ageev E. V. , Novikov E. P. , Pereverzev V. О. , Ageeva A. E. 
Published: April 2024

The purpose of this work was to study the elemental composition of titanium metal waste to be processed by the method of electroerosive dispersion into spherical powders suitable for additive manufacturing.Methods. When conducting experiments on X-ray fluorescence analysis of chemical composition, pieces of metal waste rods of a titanium alloy of an unknown brand were used. An X-ray fluorescence spectrometer Niton Goldd (USA) was used to determine the elemental composition and percentage of elements in the alloy under study. With this method, X-ray radiation is directed at the sample under study, the reflected wave spectrum is obtained and the characteristics of the spectrum of secondary fluorescent radiation of the sample are analyzed. In this case, electromagnetic waves form secondary X-ray radiation, i.e., characteristic lines that are characteristic of atoms of various elements and have their own individual characteristics. Thus, the elemental composition of the sample under study is determined, and the intensity of these lines shows the quantitative concentration of elements.Results. Using a portable Niton Goldd spectrometer, it was found that titanium metal waste corresponds to the grade of the OT4-0 alloy. The data obtained made it possible to identify samples of the studied metal waste to be processed by the method of electroerosive dispersion into spherical powders suitable for additive manufacturing. As a result of comparing the percentage of chemical elements of the studied metal waste and alloy OT4-0 according to GOST 19807-91, minor discrepancies were found due to the absence of elements such as O, Si, C, N and H. in metal waste. Apparently, this difference is related to their possible presence in small amounts up to 0.1% or complete absence.Conclusion. Renovation of metal waste, including titanium metal waste, will contribute to resource conservation, import substitution and ensuring the technological sovereignty of the Russian Federation.
Examining and Comparing the Validity and Reproducibility of Scales to Determine the Variety of Vegetables Consumed: Validation Study
Authors: Ominami Kaya , Kushida Osamu 
Published: April 2024

Background
Previous studies have reported that vegetable variety reduces the risk for noncommunicable diseases independent of the amount consumed.

Objective
This study aimed to examine and compare the validity and reproducibility of several scales to determine vegetable variety.

Methods
In total, 23 nutrition students in Japan reported their vegetable intake over the past month using a self-administered questionnaire between July and August 2021. Specifically, four scales were used: (1) a single question regarding the number of vegetables consumed (scale A); (2) a scale containing 9 vegetable subgroups included in the brief-type self-administered diet history questionnaire (scale B); (3) a scale containing 19 vegetable items included in a self-administered diet history questionnaire (scale C); and (4) a scale containing 20 vegetable items from the Ranking of Vegetable Consumers in Japan, which was analyzed based on a report on the National Health and Nutrition Survey in Japan (scale D). Scale validity was assessed by correlation with the number of vegetables consumed, which was collected from dietary records for 7 consecutive days. Reproducibility was assessed by test-retest reliability.

Results
Regarding the validity of the 4 scales, significant correlations were found between scales C (ρ=0.51) and D (ρ=0.44) with vegetable variety based on dietary records, but scales A (ρ=0.28) and B (ρ=0.22) were not significantly correlated. Reproducibility showed a significant correlation in scale B (ρ=0.45) and strong correlations in scales C (ρ=0.73) and D (ρ=0.75).

Conclusions
The scales for vegetable items have acceptable validity and reproducibility compared to the scales that used a single question or vegetable subgroup and, therefore, may determine the variety of vegetables consumed.
Natural Language Processing–Powered Real-Time Monitoring Solution for Vaccine Sentiments and Hesitancy on Social Media: System Development and Validation
Authors: Huang Liang-Chin , Eiden Amanda L , He Long , Annan Augustine , Wang Siwei , Wang Jingqi , Manion Frank J , Wang Xiaoyan , Du Jingcheng , Yao Lixia 
Published: April 2024

Background
Vaccines serve as a crucial public health tool, although vaccine hesitancy continues to pose a significant threat to full vaccine uptake and, consequently, community health. Understanding and tracking vaccine hesitancy is essential for effective public health interventions; however, traditional survey methods present various limitations.

Objective
This study aimed to create a real-time, natural language processing (NLP)–based tool to assess vaccine sentiment and hesitancy across 3 prominent social media platforms.

Methods
We mined and curated discussions in English from Twitter (subsequently rebranded as X), Reddit, and YouTube social media platforms posted between January 1, 2011, and October 31, 2021, concerning human papillomavirus; measles, mumps, and rubella; and unspecified vaccines. We tested multiple NLP algorithms to classify vaccine sentiment into positive, neutral, or negative and to classify vaccine hesitancy using the World Health Organization’s (WHO) 3Cs (confidence, complacency, and convenience) hesitancy model, conceptualizing an online dashboard to illustrate and contextualize trends.

Results
We compiled over 86 million discussions. Our top-performing NLP models displayed accuracies ranging from 0.51 to 0.78 for sentiment classification and from 0.69 to 0.91 for hesitancy classification. Explorative analysis on our platform highlighted variations in online activity about vaccine sentiment and hesitancy, suggesting unique patterns for different vaccines.

Conclusions
Our innovative system performs real-time analysis of sentiment and hesitancy on 3 vaccine topics across major social networks, providing crucial trend insights to assist campaigns aimed at enhancing vaccine uptake and public health.
Information Sovereignty of the Republic of Belarus and the Russian Federation: Directions for Ensuring and Ways to Improve them
Authors: Ivantsov A. V. 
Published: April 2024

The article discusses the main directions of ensuring information sovereignty in the Republic of Belarus and the Russian Federation, as well as ways to improve them. To date, some problems have been identified that relate to the security of the information sphere of the Russian Federation and the Republic of Belarus, which made it possible to create specific measures to resolve them.Aim. In the information sphere of countries such as the Republic of Belarus and the Russian Federation, various studies of a comprehensive plan were conducted by various scientists, politicians, as well as the military. Thanks to these studies, today there is a theoretical basis for improving the entire mechanism for protecting the information sovereignty of the two countries. However, due to the dynamism of the integration plan processes, changes in globalization, as well as due to the situation in geopolitics, it becomes necessary to conduct more and more analytical studies regarding the application of practical experience in ensuring national security in the information sphere.Tasks. Identification and justification of priority areas for improving the provision of information sovereignty of the Republic of Belarus and the Russian Federation as the basis of the information component.Methods. During the study, standard scientific methods of analysis and synthesis, expert-analytical, structural-logical, comparative and structural-functional methods, as well as a forecasting method were used.Results. The study showed that the information sovereignty of the Republic of Belarus and the Russian Federation ensures their political, economic, social stability and sustainable progressive development, since in the context of the globalization of the information space and key areas of public life, the influence on the information field increases and the importance of information security at the national levels increases for each state.Conclusions. It is expedient to consolidate the equal importance in the composition of the structural mechanisms for ensuring the information sovereignty of the Republic of Belarus and the Russian Federation, their constitutional and legal status and equivalent nature. The use of exclusively control and supervisory, regulatory and restrictive procedures in the information environment is not sufficient to maintain information sovereignty.
Current Approaches to Improving Consensus Decision-Making Mechanisms in International Regional Organizations
Authors: Golub K. Yu. 
Published: April 2024

This study is aimed to study a key element of the activity of any international organization — the problem of consensus decision-making and the corresponding practice of solving it both in integration bodies (Eurasian Economic Union, European Union) and in interstate organizations devoid of a supranational component (Shanghai Cooperation Organization, North Atlantic Treaty Organization treaty, Collective Security Treaty Organization).Aim. Identify current approaches to improving the application of the rule of consensus in interstate (intergovernmental) structures and their bodies.Tasks. Investigate and generalize the practice of consensus decision-making within the international regional organizations, highlight actual ways to increase the efficiency of their decision-making mechanisms.Methods. The study used general scientific methodology. The comparative analysis method is used to compare existing decision-making practices. Analysis, synthesis, generalization, as well as the formal logical method were used to formulate the conclusions of the work.Results. The collective decision-making based on consensus follows from the international legal principle par in parem non habet imperium. It emphasizes the equality of all participants in an international organization and excludes the imposition of obligations non-approved by a sovereign state. From this point of view, consensus is a way to strengthen unity and achieve organizational stability. Simultaneously the practice of using this form in various international organizations gives evidence to its low efficiency in decision-making. Achieving consensus requires intensive efforts to coordinate the positions of the parties, and the emergence of “one-vote veto” situations cannot be ruled out. A possible way to increase the efficiency of decision-making within the framework of integration processes (EU, EAEU) lies through the development of supranational mechanisms.Conclusions. Analysis of the practice of functioning of international regional organizations (SCO, NATO, CSTO) allows to identify two approaches aimed at overcoming the negative features of consensus decision-making. The first involves the development of an international organization with formal obligations of members into a community associated with the establishment of a set of shared values among its participants. The second presumes the creation of mechanisms that allow interested states to use the institutions of such a structure to make collective decisions without a not-participating state. Both approaches do not exclude but complement each other.
Eurasian Business in Developing Eurasian Economic Integration
Authors: Mikhnevich S. V. , Aksenov M. A. 
Published: April 2024

Aim. The study of the involvement of the business community in the development of Eurasian integration through the reflection of their priorities in the decisions and activities of supranational bodies.Tasks. To analyze the problems of reflecting the interests of the business community in Eurasian integration; to consider the related practical interaction of business with supranational bodies on the example of the activities of the EAEU Business Council; to identify areas of development of integration processes within the EAEU that are promising from the point of view of the business community.Methods. The research uses general scientific and special methods of quantitative and qualitative analysis, as well as the author’s methodology for assessing business involvement in integration processes has been developed and applied.Results. The conducted analysis of valid strategic documents of the Eurasian Economic Union (EAEU) and its supranational bodies using the authors’ technique confirms the considerable and growing role of business in Eurasian economic integration.Conclusions. Trade and investment cooperation under the EAEU demonstrates positive dynamics despite growing international uncertainty and tensions. It is in many ways connected with the proactive stance of Eurasian business, which demonstrates substantial and rising interest towards Eurasian economic integration.The Eurasian supranational bodies pay serious and growing consideration to positions of business community, which positively affect business involvement in institutional dynamics of the EAEU. That is affirmed by adding appropriate tasks to the key documents of the Union and introduction of special mechanisms for promoting business cooperation.
Strategy for Socio-economic Cross-border Cooperation in the Regional Context (the Example of the Omsk Region and the Republic of Kazakhstan)
Authors: Pogrebtsova E. A. 
Published: April 2024

Active development of socio-economic ties and logistic chains with friendly states is of strategic importance due to the current geopolitical situation. Omsk region is located at the crossroads of important railways and waterways. Therefore, it is very important to form a strategy of development of the main directions of deep regional cross-border cooperation. It will allow to steadily develop friendly ties, diversify the economy, use the available resources and innovative technological platforms.The article presents the main approaches to the concept of “cross-border cooperation”. The legislative base is studied, the role and content of interaction of territories on the example of the Omsk region and the Republic of Kazakhstan is revealed. Special attention is paid to the factors influencing successful and constraining cooperation between neighboring regions of the countries. The main directions for the development of socio-economic regional cross-border cooperation are revealed.Aim. The purpose of this article is to analyze the implemented strategy of socio-economic interregional cross-border cooperation, as well as to identify the main points of contact between the Omsk region and the Republic of Kazakhstan.Tasks. During the research, the following tasks were solved: the concept of regional cross-border cooperation was defined; normative-legal acts in this area were analyzed; the strategy of socio-economic regional cross-border cooperation on the example of the Omsk region and the Republic of Kazakhstan was evaluated; the main points of contact in this territory were revealed.Methods. The research is based on scientific publications of scientists in the field of interregional crossborder cooperation. The methods of research, analysis, systematization and generalization were used to assess the effectiveness of the strategy.Results. The results of the evaluation of the strategy of regional cross-border cooperation have shown that in recent years, bilateral socio-economic ties between the Omsk region and the Republic of Kazakhstan are actively developing, many successful investment projects in various areas of the economy are being implemented, forums are regularly held. However, the ongoing changes require constant revision of the strategy of interregional cooperation, as well as the identification of promising areas, taking into account the available resources.Conclusions. The current global situation opens new opportunities for the Omsk region to provide favorable conditions for the sale of goods and technologies, tourism development, etc. There is a high dynamics of long-term partnership, the formation of the legal framework that supports interregional ties between the region and the Republic of Kazakhstan. The article proposes a number of directions for building up the experience of regional mutually beneficial interregional cooperation.