bluuebunny/crossref_metadata_2025 huggingface dataset:
Evaluation of gabapentin efficacy in palliative care persistent hiccups management: case series
Authors: Alshammary Dr. Sami , Alamin Dr. Mohanned
Published: May 2024

We have noticed it’s common to see hiccups in the palliative patients and in most cases need pharmacological intervention. As a part of patient’s standard care and comfort, the presence of treatment guidelines for persistent hiccups is of paramount importance. In our cases the gabapentin appears to be effective for treating persistent hiccups.
A novel use of endobronchial ultrasound bronchoscope to biopsy supraclavicular lymph node
Authors: Zhang Chenchen , Haas Andrew R. , C. Ma Kevin , Lanfranco Anthony R. , Hutchinson Christoph T. , Andronov Michelle , Lobo Katelyn , Dibardino David M.
Published: May 2024

Background: Accurate staging for patients with lung cancer is essential for management and prognostication. Percutaneous ultrasound-guided fine needle aspiration (US FNA) of supraclavicular lymph nodes is not always performed clinically for variety of reasons. Our study explores the utility of supraclavicular lymph node biopsy using the endobronchial ultrasound (EBUS) bronchoscope at the time of a mediastinal staging procedure as a possible alternative to US FNA. Methods: This study included 22 patients who underwent supraclavicular lymph node biopsy using the EBUS bronchoscope during lung cancer staging procedure from 2019 to 2021 at the University of Pennsylvania. Feasibility and safety of the procedure were reported. Descriptive statistics were performed for baseline demographics, imaging features, pathology results, tumor cellularity and adequacy for oncological testing. Results: The procedures were safely performed in all patients with no safety events reported. All patients were diagnosed with malignancy and EBUS-guided supraclavicular lymph node FNA showed definitive diagnosis in 19. Of the 16 patients with the final diagnosis of non-small cell lung cancer (NSCLC), 14 had tumor seen in supraclavicular lymph node sampling and 9 were upgraded to Stage IIIB disease from lower mediastinal lymph node staging. Eleven supraclavicular lymph node samples had tumor cellularity >10%. Eight samples were sent for next generation sequencing (NGS). Three of them were the only source for NGS. Conclusions: Supraclavicular lymph node biopsy using the EBUS bronchoscope is a feasible and safe procedure to perform during lung cancer staging. Sampling has significant clinical value for accurate staging and oncologic testing.
The effect of liquid crystal concentration on electrooptical properties of five flexible polymer dispersed liquid crystal formulations
Authors: H Hakemi
Published: May 2024

We investigated the effect of concentration on the electro-optical properties of some flexible PDLC formulations with various liquid crystal mixtures. The PDLC films were prepared on flexible ITO-PET supports by UV-PIPS phase separation method and the uniform film thickness was insured by plastic micro-spacers. We found that depending on the type of liquid crystal and PDLC process conditions, the electro-optical properties (off-state and on-state transmissions, switching voltages and response times) provide different concentration dependency with various trends in the studied flexible PDLC formulations.
Mitochondrial diseases: past, present, and future
Authors: AkL Ahmed , Afsah Iman , A Saad Ramadan
Published: May 2024

Mitochondria are membrane-bound organelles found in almost all eukaryotic cells. Mitochondria are in charge of mastering and organizing cellular energy production in order to sustain life. Two genomic systems are responsible for mitochondrial biogenesis: nucli-genomes and another set of mitochondrial genes (mtDNA). MtDNA encodes 13 proteins that are required for respiratory chain function. Mitochondria play a role in a variety of cellular processes, including calcium signaling, cell cycle, differentiation, and cell death. Mitochondrial shape indicates good health, and their location in the cell is essential for their function. Mitochondrial dysfunction has been linked to Alzheimer's disease, metabolic disorders, ischemic brain, heart, and neurodegenerative diseases. In this section, we exemplify the clinical implications of mitochondrial diseases in terms of acquired defects
Drug handling by elderly kidney: a prospective review to senile kidney physiology
Authors: AkL Ahmed , Afsah Iman , A Saad Ramadan
Published: May 2024

Many organs' functional reserve tends to deteriorate as we age. In particular, elderly people have lower lean body mass, serum albumin levels, hepatic perfusion, and filtration rate of residual glomeruli. Furthermore, comorbid processes frequently affect renal patients, who are treated with a variety of medications. Some drug interactions are also altered by the aging process, such as the affinity and number of receptors for certain drugs, as well as cell responses to receptor activation. As a result, Patients with kidney disease who are elderly are more prone to experience adverse drug reactions. The lack of available information on the pharmacokinetic/dynamic profiles of a large number of daily used drugs makes planning a safe pharmacological regimen difficult in this patient group. Finally, many elderly patients are unintentionally disobedient. We will go over the physiological aspects of drug administration in aging kidneys in this literature review.
The geometry of the Rindler black hole
Authors: Turinov A.
Published: May 2024

Using Einstein's equations for gravity for a spherically symmetric field in a static state and the mass function method, a general form of the metric for Schwarzschild-type black holes is proposed. A qualitative analysis of Schwarzschild, Reissner–Nordström and Rindler geometries is performed. In the paper, it is found that Rindler black hole geometry is structurally inverse to Reissner–Nordström geometry, i.e. it has two T-regions and one R-region. In this regard Rindler geometry is like geometry of the Kottler black hole, which does not have flat asymptotics. Potential curves in the gravitational field of the Rindler black hole are constructed, which makes it possible to calculate the limits of finite motion for a test particle in this field. In addition, a qualitative comparison with the known Schwarzschild field metric is performed. Their similarity in behavior at small distances and absolutely different behavior at large scales are shown. Using the known accelerations of the Pioneer spacecraft, limits are numerically found for the T- and R-regions of their motion in the gravitational field of the Solar System.
Crystal structure of ZnO nanocrystals synthesized by the spray pyrolysis method
Authors: Kovalenko O. V. , Slavnyi V. V.
Published: May 2024

The paper discusses the issues related to the influence of technological conditions of synthesis by ultrasonic spray pyrolysis on the size and lattice parameters of ZnO:Mn nanocrystals. It is found that, depending on the concentration of zinc nitrate in the base solution from 5% to 10%, the synthesized nanocrystals have sizes ranging from 36÷40 nm for small solution droplets and 51÷55 nm for large droplets, respectively. Based on the X-ray diffraction data, it is found that the nanocrystals of small sizes have a more perfect crystal structure with a small number of intrinsic defects compared to the nanocrystals of larger sizes.
Thermally induced effects on optical absorption in Ag-doped Bi12SiO20 single crystals
Authors: Panchenko T. V. , Trubitsyn M. P. , Volynets D. V.
Published: May 2024

The spectral-temperature dependences of optical absorption of Bi12SiO20 crystals doped with Ag ions were measured in the visible range of photon energy hν. The temperature of the samples was varied in heating-cooling cycles in the interval T = 280 – 680 K. It was shown that the spectra fulfilled Urbach rule for hν > 2.1 eV at the forbidden zone width of 3.3 eV. The Urbach rule parameters, calculated within the frame of the electron-phonon interaction model, showed anomalous behavior in the interval T = 389 – 500 K. The observed peaks in the temperature dependences of optical absorption were attributed to the competition of thermally induced processes of color centers formation and destruction. The color centers were assumed in the form of Ag2+ – 2O- and Ag+ – O- complexes that are created due to thermal activation energy Ea1 = 0.1 eV and Ea2 = 0.145 eV, respectively. The spectrum of thermochromic effect characterizing non-reversible thermally induced weakening of optical absorption was detected and analyzed.
Índices de fragmentación urbana aplicado a las nuevas centralidades de la ciudad de Culiacán
Authors: Pérez Peñuelas Belén
Published: May 2024

La entrada del nuevo modelo económico orientado a la apertura comercial iniciada a finales de los años setenta del siglo XX propició que las ciudades latinoamericanas experimentaran intensos procesos de reestructuración debido al rápido crecimiento, el abandono de las instituciones oficiales y el protagonismo de iniciativa privada. Este proceso contribuyó a la promoción y formación de núcleos urbanos periféricos, considerados como aspectos principales en la reestructuración territorial. La estructura urbana se transformó en una fragmentada y descentralizada al disminuir la importancia del centro y por la diversificación de dichos núcleos urbanos periféricos que, si bien se complementan, también compiten entre ellos, se especializan en los servicios que ofertan y son selectivos de los grupos poblacionales a los cuales ofertan sus servicios. El objetivo de esta investigación es obtener el índice de fragmentación urbana de las centralidades intraurbanas de la ciudad intermedia de Culiacán, mediante un formato de levantamiento, para determinar el número de elementos divisorios con que cuenta cada una. Los resultados mostraron que las centralidades más consolidadas como centro principal cuentan con los índices de fragmentación urbana más bajos; mientras que las nuevas centralidades, aun débiles en concentración de centralidad, cuentan con los índices de fragmentación más altos. Lo anterior debido a que las nuevas centralidades están especializadas en los servicios que ofertan y, por lo tanto, van dirigidos a ciertos grupos poblacionales. Además de que no cuentan con todos los medios de conectividad con los que cuenta el centro principal.
New records of the genus Anaides Westwood, 1842 (Coleoptera, Hybosoridae, Anaidinae) from the Chocó Biogeographic Region of Colombia
Authors: Clavijo-Bustos Julián , Cárdenas-Bautista Johann Stephens , Murillo Barahona Darío Antonio , Rengifo-Mosquera Jhon Tailor , Rengifo Murillo Leyser
Published: May 2024

During a recent expedition in the moist lowland Chocó forests from Colombia, three species of Anaides Westwood, 1842 were collected. These specimens represent important extensions to their distribution and are notable records for the Chocó Biogeographic Region of Colombia, and for the country itself. Anaides fossulatus Westwood, 1842 is recorded for the first time in the Colombian Chocó region, Anaides planus Ocampo, 2006 is confirmed for Colombia, and the distribution of Anaides longeciliatus Balthasar, 1938 is extended to Colombia.
Asymptotic Normality of Single Functional Index Quantile Regression for Functional Data with Missing Data at Random
Authors: Allal Anis , Kadiri Nadia , Rabhi Abbes
Published: May 2024

This work addresses the problem of the nonparametric estimation of the regression function, namely the conditional distribution and the conditional quantile in the single functional index model (SFIM) under the independent and identically distributed condition with randomly missing data. The main result of this study was the establishment of the asymptotic properties of the estimator, such as the almost complete convergence rates. Moreover, the asymptotic normality of the constructs was obtained under certain mild conditions. Lastly, the authors discussed how to apply the result to construct confidence intervals.
Aqueous synthesis of highly luminescent AgInSe2/ZnS core/shell nanocrystals
Authors: Thi Thu Huong Tran , Thi Hiep Nguyen , Thu Loan Nguyen , Van Long Le , Thanh Tung Nguyen , Thi Dieu Thuy Ung , Reiss Peter , Kim Jae Yup , Quang Liem Nguyen
Published: May 2024

Ternary I-III-VI chalcopyrite-type nanocrystals (NCs) range among the most important alternative materials to Cd-based NCs. Within this materials family, AgInSe2 (AISe) presents a narrower bandgap than widely studied AgInS2 (AIS), making it more suitable for numerous applications. At present, it remains a long-standing challenge to directly synthesize high-quality AISe core and AISe/ZnS core/shell NCs in aqueous solution at atmospheric pressure. In this work, we describe their synthesis using glutathione and citric acid as dual stabilizers. First, to form AISe core NCs, the Se precursor is injected into a solution containing the Ag and In complexes at 96 °C for 20 min. In the second step, the AISe/ZnS core/shell structure is created by growing the ZnS shell on the AISe NCs surface at 90 °C for 60 min. The synthesized AISe and AISe/ZnS core/shell NCs are characterized using X-ray diffraction, transmission electron microscopy, and UV-Vis absorption and photoluminescence for optical spectroscopies. After the growth of the ZnS shell, AISe/ZnS core/shell NCs exhibit higher photostability and emit intense luminescence at a wavelength of 680 nm with an impressive quantum yield (QY) of 30 %, which represents a threefold higher than the AISe core NCs. These properties make the aqueous soluble AISe/ZnS core/shell NCs favorable candidates for lighting, displays, and biological imaging applications.
Application of hybrid modeling to predict California bearing ratio of soil
Authors: Thi Thanh Ngo Huong , Anh Thi Bui Quynh- , Nguyen Van Vi , Nguyen Thi Bich Thuy
Published: May 2024

California Bearing Ratio (CBR) is used to assess bearing capacity, deformation characteristics of roadbed soil, and base layer material in pavement structure. In general, CBR is often determined by laboratory or in-situ tests. However, it is time- and cost-consuming to conduct this experiment because this test requires cumbersome equipment such as a compressor. In this study, two Artificial Intelligence models are developed, including a simple model (Decision Tree Regression, DT) and a hybrid model (AdaBoost - Decision Tree, AB-DT). Using 214 data samples from Van Don - Mong Cai expressway, Vietnam, 10 input variables of the model were considered namely particle composition (content of gravel (X1), coarse sand (X2), fine sand (X3), silt clay (X4), organic (X5)), Atterberg limits (Liquid limit (X6), Plastic limit (X7), Plastic index (X8)), and compaction curve (optimum water content (X9) and maximum dry density (X10)). The developed models were evaluated by using a variety of statistical indicators, including coefficient of determination (R2­­), Root mean square error (RMSE), and Mean absolute error (MAE). The results show that AB-DT model has higher accuracy than the DT model. Moreover, the SHAP value analysis shows that the variable X10 influences the CBR value the most. Thus, it implies that applying the AB-DT model to effectively predict the CBR of the roadbed soil saves time and money for experiments.
Effect of consumer dissonance on product packaging: an empirical study of distance learning students in Lagos, Nigeria
Authors: Olutade Enitan Olumide , Enwereji Prince Chukwuneme
Published: May 2024

The Axiom ‘seeing is believing’ is becoming no more imperative with the packaging of consumable goods after consumers’ experience with a brand. There is no doubt that this is one of the key drivers of brand switching.  This research evaluates the effect of product packaging on post-purchase decisions of consumable products in Nigeria. Cognitive dissonance is a situation where consumers’ needs are not met and the consumer’s experience is far below the expectation. This could be a result of the failure of the packaging to adequately protect the product content; the packaging not drawing attention to the product, or it could not flaunt the egoistic nature of the consumer in terms of novelty where the consumer expected to portray his/her social class attribute. Do marketers adequately exploit the impacts/benefits of packaging to reduce consumer dissonance? What are the aftermaths of consumer dissonance on product packaging? A survey was conducted amongst marketers, distributors, and consumers of PZ Cussons PLC using random sampling. The relationships between responses were assessed and the results are presented and discussed. This study affirms that marketers should take advantage of packaging attributes to prevent or reduce the incidence of consumer dissonance. Hence, it is suggested that marketers should endeavor to invest more in product packaging design in order to gain consumer satisfaction and loyalty which could result in increased purchases.
DEVELOPMENT OF INNOVATIVE TECHNOLOGIES IN CONSTRUCTION AND CIVIL ENGINEERING IN THE CONTEXT OF DIGITALIZATION OF THE UKRAINIAN ECONOMY
Authors: ARUTIUNIAN I. A. , AZHAZHA O. V. , KUZNETSOV V. V. , ARUTIUNIAN YE. E.
Published: May 2024

Purpose. Construction and civil engineering, traditionally perceived as conservative industries, also feel the need to adapt to the demands of the time and introduce innovative technologies. Ukraine, entering the era of digital transformation, is actively developing and implementing new technologies in the construction industry. Therefore, systematization and coverage of key aspects of the impact of digital Transformation into the construction industry and civil engineering in Ukraine is the main task today. Methodology. The introduction of Internet of Things technologies in the construction industry expands the possibilities of building control and management. Findings. Sensors located in different parts of the structures allow you to monitor the condition of the building in real time, identify possible problems and ensure the safety of objects. Artificial intelligence is becoming an integral part of the digital transformation of construction. Machine learning algorithms help predict and optimize construction processes, which increases Efficiency of planning and resource management. The 3D printing system in construction is one of the promising and revolutionary innovations that is already influencing traditional approaches to construction processes. This digital technique will bring significant changes to the field of construction, accelerating and optimizing a number of stages from design to execution Originality. Analysis of current problems, especially now, in the difficult times of war, industrial construction in Ukraine, as well as around the world, is a promising direction for the development of other industries in general. Industrial construction is an important branch of the construction industry that specializes in the creation and operation of buildings and infrastructure facilities for industrial needs. Practical value. The introduction of innovative technologies in construction and civil engineering in the context of digitalization of the Ukrainian economy has a significant practical impact on various aspects of the industry: Improving Construction Productivity and Quality: Use of digital technologies such as the Internet of Things (IoT), artificial intelligence (AI), virtual reality (VR) and augmented reality (AR), allows you to increase the efficiency of construction processes, reduce the time of work and avoid errors; Cost optimization: Using machine learning algorithms to predict resource needs, such as materials and labor, allows you to rationalize costs and reduce construction costs.
OPTIMIZATION OF ORGANIZATIONAL PROCESSES IN CIVIL ENGINEERING USING LOGISTICS MODELS
Authors: ARUTIUNIAN I. A. , KOVALENKO O. S.
Published: May 2024

Purpose. In accordance with the analyzed problem, there is a need for a more detailed study and justification of the benefits of implementing logistics models to optimize organizational processes in civil engineering. Methodology. To achieve this goal, the article conducts a systematic analysis of organizational processes in civil engineering in terms of logistics approaches. Current trends in the industry, regulations and scientific developments are considered, risks and barriers that may arise when implementing logistics models in the construction industry are analyzed, practical examples of possible use of logistics concepts in civil engineering at different stages of work and when using specific building materials are offered, ways to overcome barriers and stimulate the implementation of logistics models are provided, and an integrated approach to optimizing organizational processes in civil engineering is proposed. Findings. The study has shown that the introduction of logistics models in civil engineering can lead to: significant efficiency improvements, shorter construction time, reduced costs for materials and transportation, improved quality of construction work, reduced environmental impact, rational use of resources, reduced construction waste, increased competitiveness, improved safety, and increased project profitability. Originality. The key principles of development and functioning of logistics models in the context of civil construction are identified: the principle of integration: combining all stages of the construction process into a single logistics system, the principle of resource optimization: minimizing the cost of materials, transport, labor, the principle of flexibility and adaptability: the ability to adapt the logistics model to changing construction conditions. Practical value. The results of the study indicate that the introduction of logistics models in civil engineering is a relevant and promising area for optimizing processes in this sector. The use of logistics can contribute to effective resource management, increase productivity and reduce costs, which is noted by the practical importance of this study.
INNOVATIVE TECHNOLOGY FOR THE CONSTRUCTION OF A PYLON STATION OF THE METRO BASED ON THE EXPERIENCE OF USING NATM
Authors: BANNIKOV D. O. , NETESA M. I. , KUPRII V. P. , DUBINCHYK O. I.
Published: May 2024

Purpose. For quite a long time, the metro station of the pylon type of deep contour interval was considered an underground structure that no longer has development potential. However, after the introduction of innovative technologies during the construction of the Dnipro metro, in particular the New Austrian Tunneling Method (NATM), this design is being used again and has developed further use. The purpose of the scientific article is to analyze innovations in the technology of construction of a three-vaulted pylon metro station from precast reinforced concrete using NATM, which require scientific justification. Methodology. In order to achieve the goal, the traditional technology of constructing a deep contour interval pylon station was revised. An analysis of the features of NATM, which allow it to be used during the construction of a pylon station in strong rock, has been carried out. A step-by-step analysis of the construction of the station was implemented with the involvement of mathematical modeling based on the finite element method. For this purpose, a number of finite-element models of each stage of construction of a pylon-type station have been created. After the numerical analysis, the indicated models were adjusted in accordance with the changes associated with the new construction technology. Findings. The value of the stress-strain state of the pylon station was obtained during the numerical analysis of each stage of construction. Stress analysis proves the possibility of applying innovative construction technology in the case of a pylon station. Originality. On the basis of the performed numerical analysis of the phased construction of a pylon station based on NATM, dependencies were obtained that allow revising the existing concept of the construction of this type of station in strong rocks. The obtained data justify the application of NATM and release the potential of the analyzed underground structure. Practical value. The substantiation of the innovative technology based on NATM allows expanding the scope of its application and successfully carrying out the construction of such complex underground facilities.
RENOVATION OF A TOWER-TYPE INDUSTRIAL BUILDING AS AN EXAMPLE OF THE WATER TOWER OF THE UKRAINIAN STATE UNIVERSITY OF SCIENCE AND TECHNOLOGIES
Authors: HROMOVA O. V. , YAROSH O. M. , KOPANYTSYA O. P.
Published: May 2024

Purpose. Research and analysis of the main approaches to the renovation of tower-type industrial buildings, establishing a connection between the geometric space and the functional-spatial zoning of the premises created on their basis. Methodology. The study is devoted to one of the groups of neglected engineering structures, such as water towers. Such industrial facilities are already embedded in the infrastructure of the city, as a rule, they are embedded in dense urban development, which adds leverage for the preservation and renovation of such facilities. During the reconstruction of tower-type industrial buildings, there are problems of dismantling, removal and disposal of a large volume of structures and building materials. Study of national and international experience in renovation of tower-type industrial buildings. According to the requirements of DBN V.2.2-15:2019 "Buildings and structures. Residential buildings. Basic provisions" to the areas of the premises in a residential building, their placement in the space of the tower is analyzed in the process of designing the floors of the tower. Findings. The possibility of renovating the tower-type industrial structure of the water tower of the Ukrainian State University of Science and Technology into a residential building was considered. The architectural design of a 3-story residential building with the arrangement of separate entrances to the building with the help of an elevator and stairs and the distribution of spaces by floor according to functional purpose was completed. Originality. For the first time, the concept of a volume-planning solution for apartments in the limited space of a water tower was developed. This example gives impetus to the development of the reconstruction of tower-type buildings, their preservation as a historical and cultural heritage of Ukraine. Practical value. Water towers that are no longer used for their primary purpose can be reconstructed and can replenish the housing stock, acquire the significance of cultural and public centers in cities and settlements.
SAVING ENERGY RESOURCES DURING THE HEAT TREATMENT OF CONCRETE DUE TO THE USE OF ADDITIVES
Authors: DEHTA T. M. , HROMOVA O. V. , VASYLENKO S. V.
Published: May 2024

Purpose of the work is heat treatment (steaming) of concrete and reinforced concrete products as an effective method of accelerating concrete hardening. Heat treatment of concrete is one of the most responsible construction processes. There are known cases when, due to the increased temperature of the concrete and large temperature differences, excessive temperature stresses arose, as a result of which cracks were formed. When choosing a method of heat treatment of concrete, you must first consider the possibility of using an energy saving method. Its extension is the introduction of additives – concrete hardening accelerators and cements of increased heat release (fast-acting and high-quality), as well as plasticizers and superplasticizers. Methodology. To reduce the duration of heat treatment or reduce the temperature of isothermal heating, it is proposed to use an additive obtained on the basis of the sludge of metal processing enterprises. The work uses standard research methods to determine the physical and mechanical properties of reinforced concrete and the quality of complex additives in accordance with DSTU 9208:2022, DSTU B V. 2.7-2.7-114-2002, DSTU B V.2.7-215:2009, DSTU B V. 2.7-214:2009. Findings. The effect of a complex slurry-based additive on the properties of reinforced concrete was investigated. The proposed additive increases the strength of concrete in all accepted heat treatment modes compared to the strength of concrete without such an additive. Originality of the obtained results is the following, theoretically substantiated and experimentally confirmed complex additive to concrete based on sludge (cake) of metal processing enterprises. The effect of the additive on the strength characteristics of concrete subjected to heat treatment under different regimes and natural hardening concrete is shown. Practical value. The results of the work are implemented in the production of reinforced concrete products and structures.
METHOD FOR CALCULATING THE BEARING CAPACITY OF A SCREW PILE WITH A SPIRAL BLADE BY THE SOIL
Authors: DUBINCHYK O. I. , ILNYTSKYI I. M.
Published: May 2024

Purpose. The purpose of the scientific article is to study and substantiate the principle methodology for calculating the bearing capacity of a screw pile with a spiral blade on the basis of field tests of a prototype pile using existing methods of theoretical calculation of similar piles. Determination of the bearing capacity of a pile with a spiral blade by the soil according to the first limit state. Also, the goal is to determine certain regularities in the modeling of pile structure. Methodology. A metal elements pile is used as a test sample. Determination of the theoretical bearing capacity of the pile in the vertical direction is conducted using formulas and calculation data from Appendix H.5 (DBN B.2.1-10-2009, 2011). The basic solution is that the load-bearing capacity of the pile is achieved due to the adhesion of each individual blade to the soil, which in total reflects the final value of the load-bearing capacity of the pile. Findings. Six experimental piles were installed and tested with static axial compressive and pullout loads. The estimated compressive, pullout and horizontal loads allowed for test piles, turned in to the design mark and tested without soaking subsoils, were determined. In this work, on the basis of experiments, the possibility of using the calculation data existing in the regulatory documentation as a justified theoretical calculation of pile-based foundations in the design of buildings and structures in general with the use of piles with a spiral blade is proven. Originality. A refined mathematical dependence for determining the bearing capacity of a screw pile with a spiral blade by the soil is proposed and the possibility of its use is confirmed experimentally. Practical value. The proposed method makes it possible to substantiate and use screw piles with a spiral blade for pile foundations.
SUBSTANTIATION OF THE PONTOON-CABLE BRIDGE STRUCTURE FROM THE TENSEGRITY CONCEPT POINT OF VIEW
Authors: OVCHYNNYKOV P. A. , TIUTKIN O. L.
Published: May 2024

Purpose. The purpose of this work is to conduct an analysis of the tensegrity concept implementation, as well as the study of already built structures and those that are currently being designed according to this principle. Also to determine main features and characteristics of tensegrity structures and to consider the previously proposed structure of the pontoon-cable bridge from the point of view of this concept. Based on the analyzed data, it is proposed to develop alternative designs of the pontoon-cable bridge. Methodology. Analysis of literary sources, data on constructed and designed bridges and other structures; analysis and synthesis of building structures elements. Findings. Based on the studied data, the main features of tensegrity, as well as the principles of numerical analysis of structures to calculate some quantitative indicators of such systems, were determined. Conclusions were made about the formal non-compliance of both the built bridges and other structures, as well as the pontoon-cable bridge with tensegrity concept. Based on the task of finding architectural forms of dome systems through cutting axisymmetric ones, an "antiderivative" symmetrical structure for a pontoon-cable bridge is proposed, which will meet the specified characteristics. Based on the study of existing cable and tensegrity structures, three alternative architectural forms for the pontoon-cable bridge were developed. Originality. Analysis of existing sources, including constructed and designed tensegrity bridges and other structures, was conducted. A summary about the feasibility and usefulness of this approach for a previously proposed pontoon-cable bridge has been made. It was concluded that, in the future, this bridge can be considered from the tensegrity point of view, provided that the introduction of some tolerances or auxiliary elements were made. Practical value. For the existing structure of the pontoon-cable bridge, after considering it from the tensegrity and other cable structures’ point of view, alternative forms are proposed that may have additional advantages for specific design or construction conditions.
APPLICATION OF WATERPROOFING SYSTEMS BASED ON METHYL METHACRYLATE RESIN ON TRANSPORT STRUCTURES
Authors: ONYSHCHENKO A. M. , HARKUSHA M. V. , FEDORENKO O. V. , HARKUSHA I. YU.
Published: May 2024

Purpose. Summarize existing approaches to the use of waterproofing systems based on methyl methacrylate resin on transport structures and develop recommendations for the installation of waterproofing systems based on methyl methacrylate resin. Methodology. To achieve the goal, the work was carried out, which consists of the analysis of the existing experience in the use of waterproofing systems based on methyl methacrylate resin, the generalization of experimental studies, which made it possible to develop requirements for the physical and mechanical characteristics of the components of the waterproofing system, the provision of recommendations for the preparation the surface for the waterproofing system, development of approaches to the arrangement of the waterproofing system. Findings. Based on the conducted studies, the existing approaches to the application of waterproofing systems based on methyl methacrylate resin on transport structures were summarized and recommendations were developed for the installation of waterproofing systems based on methyl methacrylate resin. Originality. As a result of the conducted research, the requirements for the components of the waterproofing system were summarized for the first time, namely: primer, waterproofing membrane, adhesive layer. The work improved the requirements for cement-concrete and metal foundations, considering modern European requirements. The main approaches to the arrangement of the waterproofing system have been developed. Practical value. The results of the research are relevant and necessary, waterproofing systems based on methyl methacrylate resin are widely used in transport structures, but there are no general requirements for these waterproofing systems. The paper proposes generalized requirements for materials, preparation and installation of waterproofing systems based on methyl methacrylate resin on transport structures.
OVERVIEW OF CHANGES IN THE STRUCTURE OF ASSORTMENTS AND COSTS OF BUILDING PROFILES IN UKRAINE
Authors: RADKEVYCH A. V. , BANNIKOV D. O. , NIKIFOROVA N. A.
Published: May 2024

Purpose. The main purpose of the publication is a qualitative and quantitative analysis of the changes associated with the implementation of new standards for rolled steel in recent years in the domestic regulatory framework. Also, an additional purpose is to estimate changes in the cost structure of certain types of rolled metal in Ukraine over the past 5 years. Methodology. In order to achieve the main purpose, both the rolled steel standards currently in force in Ukraine and the canceled previous standards were examined in detail. Comparison of standards for sheet profiles was carried out according to the criteria of the number of standard sizes and the profiles themselves in the standard. Comparison of standards for shaped profiles was carried out according to several criteria – the number of available standard sizes of profiles, the number of profiles themselves, the mass indicators of the largest and smallest profiles, as well as the efficiency indicators (nuclear distance and the square of the radius of inertia) of the largest and smallest profiles according to the standard. To assess changes in the cost structure of assortment profiles of various types, a quantitative comparison of their absolute and relative market value was carried out based on data from open electronic resources for the past 5 years. Findings. At present, in the part of standards for the range of steel products in Ukraine, a systematic and full-fledged update of the regulatory framework is taking place, with the full preservation of our own national heritage. The need to develop and implement a standard for flat hot-rolled broad-banded sheet, specialized and improved standards for hot-rolled bars and for cold-bent square and rectangular profiles, as well as the need to provide the official status of the standard for I-bars with parallel edges of the shelves are the main problematic issues in the part of the assortment normative base at the moment. Originality. In this publication, a theoretical estimation of modern changes in the current normative base of Ukraine, which regulates the issue of the range of steel rolled metal, is presented. In particular, 2 types of sheet metal, 5 types of shaped hot-rolled steel and 3 types of shaped cold-bent profiles, which are the most widely used for steel building structures, were analyzed. The main performance indicators of profiles according to old and new standards are calculated. Practical value. In the practical part of the completed review, changes in the cost structure of the main types of rolled steel over the past 5 years in Ukraine were estimated. The main problematic issues of the current assortment base of Ukraine are separately identified and practical recommendations for their elimination are provided.
NUMERICAL ANALYSIS OF A SINGLE-VAULT STATION OF THE SHALLOW CONTOUR INTERVAL OF THE KHARKIV METRO
Authors: SMOLIANIUK N. V. , BILCHENKO A. V.
Published: May 2024

Purpose. The development of the Kharkiv metro is characterized by the development of new structures and technologies for their construction. The extensive metro system in the city of Kharkiv and the presence of deep and shallow underground stations require scientific substantiation of these complex underground objects. The method of the scientific article is the numerical analysis of a single-vaulted shallow contour interval station, the vault of which has a special design (perforated reinforced concrete blocks). Methodology. To achieve the goal, the design of the station with a prefabricated vault and "slurry wall" was analyzed, as well as the engineering and geological conditions of its construction. A finite-element model of a single-vault station of a shallow contour interval was created. The model reproduces the geometric dimensions of the real structure of the Kharkiv metro, the layers of soil in which it is laid, the conditions of adjacency of "slurry wall", as well as perforated vault blocks. The model is based on volumetric finite elements and more fully reflects the interaction of the station with the surrounding massif. The calculation of the finite-element model for the joint effect of the self-weight of the model and the moving load of the NK-80 (combined loading) was carried out. Findings. The value of the stress-strain state of a single-vault station of the shallow contour interval was obtained. Analysis of displacements and stresses at concentration points was carried out. The situation of overstressing of the station structure and the appearance of cracking zones in the case of combined load action was revealed. Originality. The value of the stress-strain state was obtained with a combination of self-weight and moving load of NK-80, as well as with the separation of the portion of the latter. The obtained results indicate the need to revise the design of the shallow contour interval station, the vault of which has a special design (perforated reinforced concrete blocks). Practical value. It consists of the obtained results, which show the vector of development of station structures of the Kharkiv metro.
SPECIFICS OF THE COMBINED ELECTROMAGNETIC AND THERMAL PRE-TREATMENT OF THE COAL-WATER FUEL
Authors: Kuzmin Andrey , Pinchuk Valeriya , Koshelenko Yevhenii , Lutsenko Ivan , Arango David Alberto Garcia , Villa Cesar Felipe Henao
Published: May 2024

An increase in fuel usage efficiency is the path to eliminate environmental impact, decrease greenhouse
gas emissions, and prevent climate warming. Coal-water fuel (CWF) is seen as a replacement for coal and heavy oil in some applications but it has a number of disadvantages that must be addressed before it can be gasified or burned. Pretreatment (or activation) is one of the methods for improving the fuels. Since CWF is an electrically conductive substance, the electromagnetic field can be used for various
types of influences: heating, stirring by rotation, etc. Numerical research was carried out to study the
possibility of simultaneous heating and movement of CWF by a rotating electromagnetic field created in the stator of an asynchronous electric motor. The correlations between the required electromagnetic field parameters and tangential velocity profile were investigated. It was found that a change in the position of the maximum tangential velocity with increasing rotation speed can lead to a decrease in magnetic reluctance and, consequently, to a decrease in the active power required to rotate the CWF.
A comparison between geomembrane-sand tests and machine learning predictions
Authors: Tanga A. T. , S. Araújo G. L. , Evangelista Junior F.
Published: May 2024

The interaction between soils and geosynthetics plays an important role in the applications of these materials for reinforcement in geotechnical engineering. The complexities of soil-geosynthetic interactions vary depending on the type and properties of both the geosynthetic and the soil. This paper introduces a machine learning approach, specifically a random forest algorithm, for predicting interface friction angles. The dataset comprises 495 interfaces involving geomembranes and sand, with 14 influencing parameters recorded for each interface, influencing the shear strength outcome. In the analysis, Pearson's correlation coefficient is employed to measure the linear interdependence between each pair of input-input and input-output variables. Following the linear regression analysis, an optimized random forest is utilized to project the interface friction angle. The random forest algorithm divides the selected data into training and testing sets, and only 3% of the training set and 6% of the testing set exceed ±5° from the actual records. The coefficient of determination (R2) indicates strong agreement between the predicted and laboratory study friction angles, with R2 = 0.93 for the training set and R2 = 0.92 for the testing set. Consequently, the random forest algorithm demonstrates effectiveness in predicting interface friction angles.
The Collegiate Sport Experience: Reconceptualizing Sport Venues and College Athlete Satisfaction
Authors: Magnusen Marshall , Patrick Marsh  , Jeffrey Petersen
Published: May 2024

Academic institutions across the country have and will continue to spend billions of dollars annually on facilities to recruit and retain their athletes. However, most facility research in sport focuses on consumer satisfaction instead of athlete satisfaction despite the fact satisfied athletes are going to (a) be more likely to initially commit to a school and (b) be retained by a school. Thus, it is important that researchers shift from mainly focusing on sport spectators to also focusing on college athletes, the primary users of sport facilities. Accordingly, a conceptual model of collegiate athlete satisfaction with competition venues was developed from a critical review and research synthesis of the general facility management and sport facility management literatures. The proposed model created from the literature review includes financial, functional, aesthetic, and atmospheric indicators, and uses norms as comparative standards as its theoretical foundation. From this model and corresponding narrative explanation, sport researchers and athletic department administrators should gain knowledge and guidance about how to better utilize sport venues to enhance the college sport experiences of their athletes.
Martial Arts Participation, Aggression, and Self-Control
Authors: Wilkinson Matthew
Published: May 2024

The recent emergence of mixed-martial arts (MMA) as a professional sport has led to an increased interest in martial arts in the United States. While the visibility of the violence that constitutes mixed martial arts might be cause of concern, MMA is not indicative of martial arts participation as a whole. The martial arts have become an increasingly popular form of leisure that draws a broad, diverse group of participants. This study explores the relationships between martial arts participation, aggression, and self-control. Using the Buss-Perry Aggression Questionnaire (BPAQ) (1992) and Tangney’s Brief Self-Control Scale (BSCS) (2004), my findings show that compared to non-participants, individuals who participate in martial arts training are less verbally aggressive, less hostile, less angry, and exhibit more self-control.
The Design, Implementation, and Evaluation of a Pilot Online Conflict Management Workshop for High School Sport Leaders
Authors: Secaras Lauren , Driska Andrew , Erickson Karl
Published: May 2024

Conflict and conflict management in sport have received less attention from researchers and practitioners compared to other settings (i.e., business, personal relationships). Studies have focused on athlete perspectives and team outcomes of conflict (Holt et al., 2012; Paradis et al., 2014a), but lack an exploration of explicit strategies for managing conflict. Further, peer leaders of sport teams struggle with facilitating relationships and managing conflict on their teams (Voelker et al., 2011). The purpose of this two-phase study is to explore conflict in sport and potential conflict management resources for youth athletes. In Phase 1, a needs assessment, two focus group interviews with high school team captains identified current sources of conflict, barriers to addressing conflict, and their use of specific conflict management strategies. These results and the COM-B framework (Michie et al., 2011) informed the design and implementation of an online conflict management workshop. In Phase 2, twelve high school student leaders from the same school participated in the online workshop. A mixed-method evaluation measured individual changes in two variables associated with conflict management (cognitive flexibility and problem-solving ability) through surveys and focus group interviews post-workshop. Results indicated this pilot workshop was effective in increasing perceptions of cognitive flexibility and problem solving (i.e., a more positive outlook on problems, a rational problem-solving style, and less avoidance of problems). Results also support the use of a novel framework for managing conflict. The success of this workshop shows promise for future implementation and offers a resource for adolescent athletes.