bluuebunny/crossref_metadata_2025_split huggingface dataset:
Comparative analysis and modeling safe variability areas of power for VVER-1000 and AP-1000 power units
Authors: Ye Saukh S , Godun O V 
Published: December 2024

Abstract
We conducted an analysis of the safe loading and power maneuvering areas for both existing VVER-1000 power units and prospective AP-1000 power units. Mathematical models were developed to represent these areas accurately. These proposed models offer a comprehensive assessment of the potential operating conditions for Nuclear Power Plant units within the context of evolving energy systems, which are increasingly reliant on renewable energy sources. By adequately accounting for the limitations and constraints associated with safe power output maneuvering, these models facilitate informed decision-making processes regarding the integration and operation of VVER-1000 and AP-1000 nuclear power units alongside wind and solar power plants in electric power systems. This ensures the safe and efficient operation of NPP units while accommodating the growing penetration of renewable energy sources in the overall energy mix.
Modeling the process of ensuring environmental sustainability of the airport as a functional component of socio-tecnical systems
Authors: Liamzin A O , Lozova G M , Klymenko V V , Yeroshenko O R 
Published: December 2024

Abstract
The article addresses the modernization and broadening of the functional capacities of airport infrastructure, focusing on transforming airports into contemporary and ecologically safe spaces within socio-technical systems. This theme is not only pertinent for mitigating the adverse environmental effects of airports but also for enhancing the living conditions and health of the surrounding communities, airport personnel, and waiting passengers. The implementation of the ecologically safe space model yields positive economic outcomes, bolstering the airport’s image and competitiveness among investors and the public. The paper introduces an original model for ecologically safe airport spaces, offering new avenues for the development and integration of innovative technologies to optimize environmental safety. The analysis covers economic, political, technological, and environmental factors influencing airport operations and their impact on the country. A range of measures is explored to minimize the negative environmental impact of airports, forming ecologically safe spaces within airports in line with international agreements, including the Airport Carbon Accreditation program. Positive examples of zero carbon emission airports and those evolving as city-airports are examined. The core of the work lies in devising a model for economically safe airport spaces based on a mathematical model of socioium activity within a specific sector of the airport’s environmental framework. This dynamic model addresses complex issues such as reducing the airport’s negative environmental impact on human within airport confines to prevent accidents, and minimizing the cyclic interaction level among airport stakeholders.
Experimental study of the effect of hydraulic gradient on soil hydraulic conductivity
Authors: Khlapuk M M , Klimov S V , Bezusiak O V , Shumlyanskyi A O 
Published: December 2024

Abstract
When operating various hydraulic structures, particularly agricultural drains, during the water movement through soils, various types of suffusion deformations typically occur. Particle reorientation and displacement happen under the influence of various forces, including hydraulic gradients. The movement of fine particles, mechanical suffusion, and colmatage were investigated in the hydro-technical laboratory of the National University of Water and Environmental Engineering (Rivne city). Laboratory experiments on filtration using Darcy’s facility reveal patterns of the hydraulic gradient’s influence on the hydraulic conductivity in soils with different particle size distributions. The article describes the experimental facility and filtration model, outlines the selection of model soil compositions, and the corresponding experimental constructions, along with the conditions for conducting experiments. Based on the research results for selected model soils, the dependence of the hydraulic conductivity on the magnitude of the hydraulic gradient was established. The hydraulic conductivity increases with an increase in the hydraulic gradient, and upon exceeding a certain value of the gradient, known as the critical hydraulic gradient, when soil particles attain a stable position, deformation processes practically cease. It was also found that with a gradual reduction in hydraulic gradients, the hydraulic conductivity remains constant within a certain interval. Only after reaching specific gradient values does the hydraulic conductivity start to decrease, but it exceeds the initial values significantly (up to 32%). This indicates that deformations in the soil caused by mechanical suffusion and colmatage are irreversible.
Analysis of current trends in water runoff of the Sluch River in terms of extraterritorial impacts of hydrotechnical construction
Authors: Korbutiak V M , Stefanyshyn D V , Khodnevych Y V , Lahodniuk O A , Martyniuk V O 
Published: December 2024

Abstract
The aim of the conducted research was to uncover current trends in the variability of the Sluch River’s flow in the context of potential depletion of its water resources due to climate change and anthropogenic activity in its catchment area. The research methodology relied on the analysis of time series data from hydrological observations of average annual, maximum, and minimum water flows. Modern trends in the variability of the river flow were determined using data collected from three operational hydrological posts located at different sections of its course: “Hromada” in the upper part of the river basin, “Zviahel” within the middle course, and “Sarny” in the lower course. The total monitoring period for establishing modern trends in the variability of the river flow spanned 27 years, from 1989 to 2015. The research revealed that the minimum flow of the river underwent the most significant negative changes in the context of water resource depletion during this period. This finding was particularly evident at the Zviahel hydrological station.
The influence of the accident at Chernobyl nuclear power plant on the condition of pine plantations of Ukrainian forests
Authors: Melnyk-Shamrai V , Shamrai V , Patseva I , Patsev I 
Published: December 2024

Abstract
The article analyzes the distribution of trees according to the main ecological indicators that characterize the viability of artificial pine stands, in which forestry activities were stopped due to significant radioactive contamination, 35 years after the accident at the Chernobyl nuclear power plant. In intensively polluted areas and control trial areas in fresh forests, the following distribution of trees by categories of sanitary condition was noted: healthy pine trees (category I) make up 29-33 percent and 47-53 percent of the total number of trees, respectively, weakened (category II) – 29-33% and 29-37%, very weakened (III category) – 13-17% and 6-12%, the share of dying and dead trees (IV-VI status categories) is 22-24% and 9-12%. It can be emphasized that in the same studied types of forest vegetation conditions, where the levels of radioactive pollution allowed to carry out forestry activities, a much better sanitary condition of pine stands was noted. Analyzing the indicators of the general index of the sanitary condition of pine plantations in the zone of unconditional resettlement, it can be noted that all stands belong to very weakened ones, the index is in the range from 2.45 to 2.55. In the control test areas, where forestry measures for the care of stands were carried out in a timely manner, this indicator was lower – by 13-26%. The study of the process of formation of waste and drying of pine stands shows that the share of trees of IV-VI categories of sanitary condition in fresh forests is 22-24%, and this is almost a third of trees that, as a rule, will die within a few years. In addition, trees of category III (13-17%) pose a significant threat, which will move into lower status categories without forest management measures. Research results show that after the cessation of forestry activities in the zone of unconditional resettlement, there is an intensive accumulation of dryness and a significant weakening of tree stands. In the radioactively contaminated territories, almost 58 to 70% of the trees are belonging to the II and III categories of technical suitability, and in the control areas the share of trees of the I category ranges from 45 to 64%.
Study and analysis of amber deposits using ArcGIS techniques
Authors: Koval D , Remezova O , Naumenko U , Draganchuk A , Komliev O 
Published: December 2024

Abstract
Amber deposits are located within the Baltic-Dnipro province and cover vast land areas and coastal seas. In the regional dimension, the formation of amber deposits is determined by the climatic, facial and tectonic features, so it is important to link their occurrence to specific structures, especially on platform areas where morphostructures are linked to the tectonic structure. Amber deposits on the territory of Ukraine are considered to be non-commercial due to their low technical and economic indicators and limited geological exploration. The evaluation of amber deposits is proving to be an important task that affects the country’s economy. The question of the origin of known placers, including intermediate collectors, remains unresolved. Numerous researchers studied amber placers, however, the question of the origin of placers, methods of their detection and evaluation is still relevant at the present stage, since the solution of this issue will largely allow to revise their resource potential. This article examines the prospects of utilising the ArcGIS geographic information system to analyse the geological and economic potential of amber resources in Ukraine. Geological and economic modelling using ArcGIS tools makes it possible to determine the industrial value of exploration of amber deposits. The calculation of the geological and economic indicators of the deposit is based on the most relevant data under current conditions.
Electric drive of coordinated rotation for mechanisms of flow-transport systems
Authors: Khomenko V L , Sarsenbayev N S , Kuttybayev A E , Kuttybayeva A E , Ratov B T 
Published: December 2024

Abstract
The frequency method is currently recognized as the most technically and economically feasible approach for controlling alternating current electric drives. However, systems employing frequency-controlled electromechanical setups with stator circuits, while offering extensive capabilities, present a more intricate challenge for voltage frequency regulation compared to systems utilizing rotor circuits. This complexity arises from the fact that the power of a thyristor frequency converter is comparable to that of electric motors. Consequently, there is a pressing need in contemporary electromechanics for the development of innovative circuit solutions to regulate the performance of flow transport systems. This study aims to design a two-motor electric drive for the mechanisms of flow transport systems with medium to high power, aiming for improved energy efficiency. As a result of this study, it was found that utilizing a cascade circuit in a dual-motor electric drive, along with an additional power source in the rectified rotor current circuit, enables the synchronized rotation of two motors. This synchronization can be achieved not only with identical nominal parameters but also with differing power and synchronous frequency of rotation. The primary advantages of this coordinated rotation approach in a twin-motor electric drive using a cascade scheme include the ability to adjust the power factor of the machines and reduce the power transferred to the control circuit by the thyristor frequency converter, thereby enhancing the reliability of the electric drive’s power components. Furthermore, by regulating the rotation frequency of two AC motors, it becomes feasible to enhance overall energy efficiency.
Modelling and forecasting the production potential of renewable energy sources in the context of sustainable development
Authors: Derii Z V , Tkalenko S I , Liubachivska R Z , Hrytsku-Andriiesh Y P , Ya Timish R 
Published: December 2024

Abstract
The Ukrainian energy sector is experiencing a crisis. The necessity for sustainable development in Ukraine’s regions, as well as energy independence, stems from the destruction of infrastructure and the consequences of dependency on Russian resources. The current trend is to develop renewable energy sources at the regional level, resulting in a more decentralized model. The article examines the empirical relationship between the causality of production, the potential of renewable energy, and the factors that influence the country’s economic growth, such as export, electricity, total final consumption, and total energy supply. The authors propose applying the system approach principle to the study of renewable energy source production in order to ensure the country’s energy security, contribute to increasing competitiveness on the international market, and develop a model based on the production of renewable energy sources and waste in Ukraine’s difficult economic development conditions. To model the production of renewable energy sources, which is one of the vectors ensuring energy security, the authors used the software product E-Views, which allows for making informed decisions based on statistical analysis and forecasting. During the research process, the authors demonstrated that more effective achievement of sustainable development goals will be facilitated by the formation of a reasonable approach to renewable energy production and the development of a sustainable development policy for Ukraine’s regions, which should have significant differences based on the region’s specifics.
Study of double short circuits on earth in 10 kV power grids with isolated neutral and with high level penetration RES
Authors: Rubanenko O O , Belik M , Rubanenko O Y , Vishtak I V 
Published: December 2024

Abstract
Proposed study described positive influence of high level penetration of renewable energy sources in distributed electrical networks for power system in total in war conditions. Faults in transmission power lines are analysed and shown depend on level voltage. The paper presents the results of studies of double earth faults in 10 kV networks with an isolated neutral in the MATLAB program package.
The postwar perspective of ammonia production in Ukraine
Authors: Ivanenko N P , Stanytsina V V 
Published: December 2024

Abstract
After the war, a favorable situation may arise in Ukraine not only for the restoration of ammonia production but also for its increase and the implementation of new state-of-the-art technologies that make it possible to improve energy efficiency and reduce CO2 emissions. The authors have identified the prerequisites for the post-war ammonia production development in Ukraine. The authors have presented the optimization model to minimize primary investments for reaching given ammonia production and specific CO2 emissions. The sharp increase in required investments is observed when new production capacities are needed. For existing capacities that will be undamaged after wartime the most effective mitigation measure both economically and environmentally is carbon storage and capture. The main directions of further study were outlined. The paper aims to analyze the prerequisites for post-war ammonia production in Ukraine and develop an optimization model to minimize primary investments in the quantitative and qualitative development of ammonia production in Ukraine.
Utilization of vegetative waste from green infrastructure of cities “in-situ”
Authors: Maksymenko N V , Gololobova O O , Sonko S P , Stolov V O , Shiyan D V 
Published: December 2024

Abstract
Taking into account the need to provide the city’s population with green areas in accordance with the European program “Green City”, there is a problem of the formation of large volumes of plant residues that need to be utilized. At the same time, the cultivation of green infrastructure elements on urban soils requires of fertilizer. The analysis of existing systems for the management of fallen leaves in different countries, including Ukraine, was carried out and the creation of a municipal infrastructure for the disposal of in-situ organic waste of plant origin in the context of the circular economy was proposed. The author’s technology for the creation of municipal infrastructure for the disposal of organic waste of plant origin for different urban landscapes. The effectiveness of using plant waste to form the initial substrate for the creation of composts and vermicomposts was investigated. The volumes of phytomass formation from fallen leaves in the green zones of administrative districts and the city as a whole, as well as in household plots with different vegetation composition were calculated. On the basis of the data obtained, a SWOT analysis was made of the implementation of the program utilization of plant waste.
Methodology for Deformation Studies Using Geodetic Methods
Authors: Tsanovski Yuri 
Published: December 2024

Abstract
An integral part of the operation of facilities in the mining industry (in the Republic of Bulgaria, mainly open-pit mines are developed) are the control functions, including quantitative characteristics of the extracted bulk mass, deformation of the sides, etc. A possible approach to collect detailed information on the current state of the rock mass is geodetic mapping by remote sensing methods. The paper discusses the principles of cyclic geodetic measurements for quantifying displacements and velocities of discrete points, changes in volume and shape and dimensions of the observed array (deformation). Although the deformations are invariant to the coordinate system introduced and the deformation parameters are most accurately determined by “direct measurements”, the fact that there is no geodetic determination that is not defined in some coordinate system should be taken into account. in this regard, it is critical to define and implement a stable coordinate system that does not load the measured quantities defined in it with additional reductions.
ZnS shelling as the outermost layer on luminescent nanocrystals: a key strategy for quantum dot light-emitting diodes
Authors: Loan Nguyen Thu , Huong Tran Thi Thu , Thuy Ung Thi Dieu , Reiss Peter , Liem Nguyen Quang 
Published: December 2024

Abstract
Highly luminescent nanocrystals (NCs), including semiconductor quantum dots (QDs), have been synthesized as light emitters for various applications during the last three decades. Recently, light-emitting diodes based on NCs or QDs (hereafter commonly called QLEDs) have been fabricated, achieving an external quantum efficiency of more than 20%, closely approaching practical requirements. In the QLED structure, the outermost shell of the luminescent NCs or QDs plays a crucial role, as it needs to simultaneously meet the following requirements: (i) to act as an effective shell to passivate imperfections or traps on the NC surface, while confining injected charge carriers within the emitting QDs/NCs; and (ii) to possess compatibility with both the electron transport layer (ETL) and the hole transport layer (HTL) for efficient injection of electrons and holes into the core NCs/QDs. Additionally, the outermost shell of the NCs/QDs should be environmentally friendly. Practically, the outermost ZnS shell appears to satisfy all the above requirements for various types of emitting NCs/QDs, including II-VI (CdSe, CdTe, ZnSe), III-V (InP, GaP), I-III-VI (CuInS2, AgInS2, AgInSe2), and metal halide perovskites. This has naturally led to numerous studies conducted on different NCs and QDs with the same outermost ZnS shell. Using a ZnS shell is also advantageous for designing uniform QLED structures with different NCs or QDs to emit a variety of wavelengths. In this article, we review the recent development of QLEDs using various NCs or QDs as light emitters, where the spectral emission range can be controlled by simply adjusting the size or composition of the core NCs/QDs. We also discuss why ZnS is suitable for shelling various types of NCs/QDs and how it aligns appropriately with the ETLs and HTLs being studied for facilitating the injection of charge carriers in QLEDs.
Unilateral Versus Bilateral Deep Inferior Epigastric Perforator Flap Breast Reconstruction: A Systematic Review and Meta-analysis
Authors: Tekdogan Boran , Martineau Jérôme , Kalbermatten Daniel F. , Oranges Carlo M. 
Published: December 2024

Background:
Previous studies have shown a higher complication rate in bilateral (BL) compared to unilateral (UL) deep inferior epigastric perforator (DIEP) flap breast reconstructions. This systematic review and meta-analysis aimed to offer an update by including recent studies to thoroughly assess the complication rates in UL versus BL DIEP flap reconstructions and provide clear guidance for clinicians and their patients.

Methods:
A systematic review of the literature and comparative meta-analysis were performed to assess the differences in complication rates between UL and BL procedures. Only comparative studies that reported on postoperative complications after UL and BL DIEP flap breast reconstructions were included. Odds ratios (ORs) and 95% confidence intervals (CIs) were calculated using a random-effects model.

Results:
Five studies representing 5120 patients who underwent either UL or BL DIEP flap breast reconstructions were included. BL DIEP flap reconstructions were associated with a higher risk of total flap loss, with an OR of 1.48 (95% CI, 1.02–2.14) and a P value of 0.04. Conversely, the risk of reexploration surgery was reduced, with an OR of 0.68 (95% CI, 0.55– 0.84) and a P value of 0.0002.

Conclusions:
BL DIEP flap breast reconstruction carries a higher risk of complete flap loss compared with UL reconstructions, with a moderate risk increase. Despite this increased risk, the significant benefits of BL reconstruction make it a viable and recommended option for women requiring this type of surgery.