bluuebunny/crossref_metadata_2025_split huggingface dataset:
Hollow Triangular Cross-Section Calculating Precast-Monolithic Beams Methods with Account for Concrete Nonlinear Properties
Authors: Azizov Taliat , Kochkarev Dmitriy , Galinska Tatyana , Jurkowska Nadzieja 
Published: July 2024

The article examines precast-monolithic reinforced concrete beams with a cross section in the form of a hollow triangle. The advantages of such beams are presented and say that their stiffness in torsion is ten times bigger than the similar rigidity of a T-beam with the same stiffness and bending resistance. The article introduces the method of manufacturing such beams without the use of form work which was developed by the author of the article. Earlier the authors investigated the stiffness of such beams in torsion and it is mentioned in the article. However, stiffness and bending resistance are not investigated. Resistance and stiffness of precast-monolithic beams under bending differs from the resistance and stiffness of the monolithic ones. Consequently, taking into account the nonlinear properties of materials the calculation of such beams is different. The method for calculating beams under bending is introduced and it is based on the application of the flat section hypothesis. This method is used in conventional methods of calculation. The difference from the traditional calculation is the addition of equilibrium stress to the equations which are perceived by sections of monolithic concrete with physical and mechanical characteristics that differ from those of the main part of the structure. In calculation the cross-section of the beam is reduced to the equivalent T-section. The obliquity of the side faces is taken into account and the thickness of the edge of the equivalent T-beam is understood as the doubled thickness of the side edge divided by the sine of the angle of obliquity of the edges. In order to apply this calculation method, at first, it is necessary to check the sufficiency of the presence of a transverse reinforcement in the grid which is laid in the construction of the structure. With a sufficient diameter and rod spacing of transverse reinforcement which are calculated according to the authorsâ€™ previously developed method, the structure can be calculated as monolithic with sections with different material characteristics according to the method introduced in the article. The calculations based on the above procedure showed a good match with the results of experimental studies of the authors.Â Â
Investigation of the Resistance of Protective Plates of High-Strength Concrete with Dynamic Impact
Authors: Babych Yevgenij , Filipchuk Sergij , Babich Yevgen , Pahomov Roman 
Published: July 2024

In the article are given the results of the test of dynamic action of protective steel-reinforced concrete slabs. The results have been confirmed, and proved the feasibility and expediency of application for their manufacture of high-strength fast-hardening concretes. Using external damper blades for supporting the slabs allows to absorb the energy of the impact of the weapon up to 30%Â , which increases their overall resistance to dynamic influences. The use of high-strength concrete will reduce the thickness of the plates in 2 ... 3 times compared with the concrete of conventional classes.Â Â
Oil and Gas Storage Facilities Construction Operations Standardization
Authors: Bondar Victor , Bondar Liudmyla , Petrash Oleksandr , Popovych Nataliia 
Published: July 2024

This is the first research that provides the calculation of time and labor standards for foundation works at oil and gas storage facilities construction. A foundation works performance for two identical vertical steel tanks is under investigation. The reinforced soil-cement piles are suggested as the most economical way of foundation works performance at gas and oil storage facilities The deep soil mixing technology is considered. The detailed description of suggested technology is presented along with time spent for each technological element. This paper provides data on the machinery and materials needed for construction. A time study method was applied to compile a working day photo-fixation. The obtained data were processed using the method suggested by engineer Prussak. The nonlinear correlation of drilling time versus depth of reinforced soil cement piles was obtained. The influence of geotechnical conditions on time and labor consumption is presented. Time and labor standards for manufacturing 1 m3 of soil-cement piles have been calculated.Â Â Â
The Issue of Determination of the Rigidity Characteristics of Reinforced Concrete Elements with Normal Cracks
Authors: Ðzizov Taliat , Sribnyak Nataliia , Tsyganenko Liudmyla , Yurin Oleg 
Published: July 2024

Most of the reinforced concrete slab structures are statically indeterminate systems. In these systems, the redistribution of internal forces depends on the nature redistribution of rigidities between their separate elements. The presence of cracks significantly affects the change of elements rigidity of reinforced concrete structures. In the plate-ribbed systems, which include bridge structures, ribbed prefabricated and monolithic slabs, at the moment when normal cracks are wide enough, spatial torsion cracks may be absent. In this article the method of Â analysis of the rigidity of reinforced concrete elements with normal cracks is presented. The method is based on approximate striping of cross section to separate lines. The method is approximate, but it is rather convenient, since it can be used as a subprogram for analysis of complex statically indeterminate reinforced concrete systems. The torsional rigidity of every rod of the system is determined in such a subprogram atÂ iterative analysis inÂ automatic mode. As a result of this analysis, the forces in the rods of statically indeterminate system s are determined more accurately as the change of flexural as well as torsional rigidities caused by normal cracks formation were taken into account. The comparison of the results obtained by the torsional rigidity determination method with the results obtained by the numerical method confirmed theÂ developed methodologyÂ Â
The Problems of State Regulation of the Internal Forced Migration in Ukraine
Authors: Shvets Iryna , Sled Oleksandra , Liashok Yaroslav , Hryhoryeva Olesya 
Published: July 2024

The aim of this study is to determine the main areas of the state regulation of the internal forced migration in Ukraine. It is underlined that prevention of displacement and protection of IDPs and other affected population within its own country are the responsibility of state authorities. The number of internally displaced persons in Ukraine in 2014â€“2018 is analysed. The study of trends in the number of IDPs was carried out on the example of Pokrovsk town. Key feature of the forced migration processes in both Pokrovsk and Ukraine is explored and defined. It is the tendency to stabilization of the percentage of various migrantsâ€™ categories during the whole period of armed conflict. Characteristics of the statistical assessment of internally displaced persons in Ukraine are generalized. Its drawbacks and consequences are formulated. Impact of the forced migration on the internal situation in the country is identified. Based on SWOT-analysis, possibilities, significant threats, strengths and weaknesses for determining the comparative advantages and obstacles of the state regulations for internal forced migration processes are established. The objects and priority areas for the state regulation of internal forced migration processes are described. The economic and social-psychological adaptation as the main directions of the state regulation of internal forced migration is reviewed.Â Â Â
The Role of "Green Structures" in Reducing the Environmental Footprint of Urbocenoses
Authors: Tkachenko Tetiana , Voloshkina Olena , . . , . . 
Published: July 2024

The modern problem of urbocenoses is associated with an increase of the environmental footprint, the main indicator of which is the concentration of CO2 in the atmosphere. One of the ways to reduce carbon emissions is to increase biomass through the Â«green structuresÂ». Nowadays, there are insufficient methods for calculating the accumulation of biomass and sequestration of CO2. As a result, new methodological approaches are proposed.Â Â Â
Methodical Approach to Assessing the Regional Economic Security Level Based on its Components Systemic Interrelations
Authors: Onischenko Svitlana , Bondarevska Olha , . . 
Published: July 2024

At the present stage of development of Ukraine, the differences in the regions competitiveness levels due to the destabilizing factors influence are aggravated, which is a danger both for the state economy as a whole and for its regions. Therefore, the need for timely and comprehensive assessment of the territorial systems economic security, detailed study of the factors influencing regional economic security level and the interrelations between its functional components arise.The purpose of the study is to assess regional economic security level and investigate the systemic interrelations of its components on the basis of a retrospective analysis.The integral assessment of regional economic security level is suggested based on the combined use of indicative and functional methods. It has been determined that the most indicators deviate from threshold values due to a number of destabilizing and disincentive powerful factors influence.It has been established that demographic and investment components have instant dependence and the greatest influence on regional economic security unsatisfactory state. For each safety component, two indicators that most affect its integral assessment are highlighted.The study of the economic security components systemic interrelations enables local governments to apply effective measures to counter real threats and neutralize them when forming strategic and program documents on ensuring regional development security.Â Â
Features of Business Administration at different stages of Enterprise Life Cycle
Authors: Solokha Dmytro , Bessonova Svitlana , Makarenko Maryna , Redkin Oleksandr 
Published: July 2024

The purpose of the study is to formulate an approach to business administration based on the definition of the appropriate stage of enterprise life cycle. The proposed approach complements the existing methods by combining both the evaluation Â based on the analysis of characteristics of the internal components of the enterprise and the evaluation of the level of competitiveness of the enterprise and the level of financial and economic activity. The analysis of literature in the field of the theory of the enterprise life cycleÂ has allowed to form a generalized five-stage model of ELC, which includes the stages of formation, development, maturity, diversification and decline. It has been substantiated that the machine-building enterprises in Ukraine, depending on the internal contextual variables, came to such stages of the life cycle as development, maturity, and diversification. At the first stage of development, the company has a simple structure, small size and low level of formalization. At the second stage, companies are barely older and bigger, use more complex types of organizational structures and more formalized. At the third stage, enterprises are even larger and older, have a higher level of formalization and a complex structure, which periodically varies. Indicators determining the level of financial and economic activity and competitiveness of the enterprise considerably increase the accuracy of the definition of the stage of the enterprise life cycle. According to the indicators, it is possible to draw a conclusion about the degree of efficiency of the enterprise at different stages of the life cycle. Therefore, in order to choose the appropriate direction of activity, strategy for the development of an industrial enterprise, or the method of decision-making, it is necessary to monitor various financial and economic indicators and indicators of competitiveness that will determine the stage of the enterprise life cycle.Â Â Â
Wells Gas Hydrates Formation Analysis and Prevention Methods
Authors: Liashenko Anna , Melnikov Oleksandr , Petrash Ruslan , Petrash Oleksandr 
Published: July 2024

The article deals with laws of occurrence of gas hydrates in mining wells and prevention of their formation. The basic calculations for determining temperature regimes in wells have been described. The basic methods of struggle against hydrated deposits in wells have been demonstrated. The detailed description of hydrates occurrence causes is presented along with methods of its prevention from a technological perspective. This paper provides data on the techniques used for production string clearing from hydrate plagues. The conditions necessary for hydrates formations are presented. The technological methods of hydrates removal from a tubing have been described.Â Â
Ways of Buildings Energy Efficiency Increase in EU Countries and Ukraine
Authors: Kariuk Alla , Koshlatyi Oleg , Lvovska Ð¢etiana , Pashynskyi Viktor 
Published: July 2024

Directions of implementing energy saving and energy efficiency policies in international practice, in particular in European Union countries are considered in the given work. It was defined that in the majority of the countries there occurred a considerable decrease in GDP energy intensity during 1990-2016 due to energy efficient technologies implementing. Investments into energy sphere were considerably increasing under compensation at expense of systemic investment decrease into oil and gas sphere. Investments into energy efficiency according to the world regions are reviewed. It was noted that the highest result in energy efficiency sphere in all the global community are achieved in the European Union (EU). The highest level of import dependence in observed in two strategically important sectors, which are oil and gas. According to the aims and priorities of steady development, energy efficiency is defined as the most effective way of energy security increasing. A review of energy efficiency condition in Ukraine compared to world and European experience was made. Particular attention is paid to the energy efficiency condition in construction.Standards for specific energy consumption as for new buildings are substantially strengthened in EU member states, and calculation procedure for the buildings energy efficiency is obligatory in all countries. It is established that only a complex thermo-modernization of an existing housing stock can significantly affect the reduction of energy consumption.Â Â
Deep Compactor with a Concrete Mixture Laid in a Form Interaction Process Investigation
Authors: Maslov Alexander , Batsaikhan Janar , Nesterenko Jr. Mykola , Nesterenko Jr. Tatiana 
Published: July 2024

Analytically, rational parameters of a vibration machine for internal compaction of concrete mixes are determined and rational modes of vibration exposure by a flat working body on a concrete mix are established.The dynamic system â€œvibration machine - concrete mediumâ€ is investigated, in which the latter is represented as a system with distributed parameters, taking into account the elastic, viscous, inertial and energy properties of the concrete to be compacted. The partial differential equation was compiled describing the change in stresses in a compacted medium depending on the dynamic elastic modulus, dynamic viscosity coefficient, inelastic resistance coefficient and inertia of the medium to be densified as a function of density, relative deformation and texture of the concrete mix. The propagation of visco-elastic-plastic deformation waves in a compacted concrete mix, represented as a half-space, is investigated. As a result of solving the wave equation of oscillations, the regularity of the propagation of viscous-elastic-plastic deformation waves in the half-space of a concrete mixture being compacted is established. The amplitudes of vibrations and stresses arising in the compacted mixture are determined depending on its physico mechanical characteristics. The vibration amplitude of the vibration machine was determined, its rational parameters were established, and rational modes of vibration impact on the compacted concrete mix found in the form of a half-space were found. A vibration machine in the form of a flat vertical plate, in the upper part of which a horizontal vibration exciter is mounted, is proposed. The given dependences allow one to substantiate rational ones depending on the physico mechanical characteristics of the medium being compacted, the thickness and width of the layer being compacted, the angular frequency of the forced oscillations and the amplitude of the disturbing force.Â Â Â
Thermodynamic Concept of Nanotechnological Processes Reagent-Free Water Treatment in Heat and Power Systems of Construction
Authors: Zhuravska Nataliia , Kulikov Petro 
Published: July 2024

In the article the thermodynamic concept of nanotechnological processes of non-reagent preparation of technical water of thermal power engineering enterprises is considered. The thermodynamic functional characteristic is presented in heat energy systems of construction with non-reagent water treatment in electromagnetic fields. It is noted, with regard to biological impurities in water, that this method eliminates the accumulation of salts in the pipeline, biological damage, as the emergence of potentially possible critical technogenic situations.Â Â Â
Influence of the Housing Development Type on the Living Environment Comfort
Authors: Lipyanin Vadim , Milash Tetiana , Pilipaka Liudmyla , Yurin Oleg 
Published: July 2024

The article is devoted to the problems of rational use of urban areas, namely: the optimal planning of its residential development. Microdistrict and block housing development sites in the cities of Europe and Ukraine were researched. A city-planning assessment of population density and building density was carried out using a comparative analysis of microdistrict and block type of housing development of residential complexes and influence of the planning structure on the population living comfort was determined. The article presents the justification of the fact, that effective mass housing development is medium-floor block, with a convenient network of streets, designed primarily for pedestrians, dense, which in turn will significantly improve the comfort of the living environment in the cities of Ukraine.Â Â
The Reverse Subsidy`s Impact of United Territorial Community`s Budget Generations
Authors: Horoshkova Lidiia , Volkov Volodymyr , Kapranova Larisa , Komelina Anna 
Published: July 2024

Critical analysis of the fiscal equalization system proved that its main disadvantages are a real threat to UTCs.The comparison of UTCs income growth trends with the reverse subsidies` growth rate revealed that over the period from 2015 to 2017 the income growth rate slowed down accompanied by the simultaneous growth of reverse subsidy to 25% of its amount.It was proposed to determine the permissible limits of the reverse subsidy correlated to the UTC per capita income growth rate.It was proved that to describe the dynamics of UTC income it is expedient to use not the exponential law (hard model), but the logistic model (soft model).It was offered to determine the safe limits of UTC financial position`s adjustment with the help of the logistic model ensuring sustainable development.Conditions for the external impact on the UTC system in the form of reverse subsidy were shaped. Safe limits for its amounts` adjustments were defined as well. It was proved that 50% of UTC income is critical amount of the reverse subsidy. The estimated permissible amount of the reverse subsidy is no more than 25% of UTC income.It was shown that ensuring of financially substantial UTC`s sustainable development is possible, if flexible, financially proved approach when setting the reverse subsidy amount, is used.Â Â
Management Aspects of Land Leasing: Foreign and Domestic Experience
Authors: Gryshko Volodymyr , Khrystenko Olena , Gubar Olena , Maksymenko Oksana 
Published: July 2024

The article describes domestic and foreign experience in land management practices, in particular, aspects of land lease. The authors conducted a study of the effectiveness of land management, depending on the terms of land lease, as well as possible conflicts among the main stakeholders. It is determined that the main factors for ensuring the effectiveness of land management are as follows: an effective management and an institutional regulation of integrated activities aimed at the realization of environmental and economic interests. The method of dynamic programming and game theory method was applied, which made it possible to determine the respective strategic positions of the landlord and tenant.Â Â
Geometric and Computer Modeling of Building Structures Forms
Authors: Vorontsov Oleg , Tulupova Larissa , Vorontsova Iryna 
Published: July 2024

The current state of designing curvilinear objects of architecture and construction needs to take into account as many data and requirements as possible to ensure an appropriate model accuracy. In geometric modeling initial data, as a rule, are geometric characteristics and conditions, which are represented in numerical form (coordinates or values of parameters) with quite big arrays. In these conditions, methods of global continuous modeling with a single solution become ineffective. Because of this they require a usage of rather complicated mathematical algorithms and can not provide a necessary adequacy of models. Methods of discrete geometric modeling are free from these drawbacks.The purpose of this article is expanding possibilities of the classical finite difference method and the static-geometric method by applying a geometric apparatus of superposition. In discrete modeling of geometric images this allows using hyperbolic functions as interpolators.The result of this study is a computational template for continuous two-dimensional discrete interpolation. This allows to model geometric images of architectural and building constructions in the form of discrete frames of chain lines.Â Â Â