bluuebunny/crossref_metadata_2025_split huggingface dataset:
A structural-thermal coupled modeling approach on the formation of adiabatic shear bands in steel sheet blanking process
Authors: Karantza Konstantina D. , Vaxevanidis Nikolaos M. , Manolakos Dimitrios E. 
Published: February 2024

Abstract
Adiabatic shear banding reflects an unstable and dynamic plastic deformation mechanism occurring at high strain and strain rates which is strongly conjugated to fracture. Current work carries out a numerical study on the initiation and development of adiabatic shear bands (ASBs) in blanking process of AISI 4340 steel sheet. A structural-thermal coupled finite element analysis is developed in LS-DYNA software by implementing a thermo-viscoplastic flow rule for material plasticity and a damage criterion considering dynamic failure. The numerical simulations are focused on capturing ASB genesis through intense shear localization by evincing strain instability. Also, the evolution of ASB mechanism is investigated, aiming to contribute a stage-by-stage propagation and highlight its connection to dynamic failure. Further, the effect of ASB temperature and strain field on fracture is analysed, while the influence of strain/strain rate hardening and thermal softening on strain instability, peak force and the blanked surface is studied. The results revealed an S-shaped ASB due to severe shear localization and significant temperature increase, leading to dynamic recrystallization around punch-die corners and reacting to strain instability and dynamic. Finally, high magnitude thermal softening during ASB development resulted in earlier ASB generation and reduction of the peak blanking force, while further it decreased shear zone expansion and increased fractured length in the blanked surface.
Investigation of bio-based and recycled printing materials for additive manufacturing
Authors: Junk S , Vögele P 
Published: February 2024

Abstract
Additive manufacturing (AM) processes are becoming increasingly important alongside conventional processes. As a result, the consumption of materials is also increasing. The most widespread process in polymer AM is Fused Layer Modelling (FLM). Today, the FDM process often uses synthetically produced materials based on petrochemical processes. However, there is little knowledge about which bio-based and recycled polymer materials are suitable for sustainable polymer AM. The aim of this paper is to carry out investigations of eight selected materials, which are already commercially available, to gain insights into their suitability as materials for polymer AM. These materials are divided into four categories: conventional, recycled, bio-based and fibre-reinforced thermoplastics. The evaluation model consists of a point system in which the materials are evaluated according to various weighted criteria. For technical, economic and ecological evaluation meaningful criterions were developed and applied. Based on the evaluations, three two-dimensional strength diagrams were developed, from which the results of the materials, on two of the evaluations in each case, can be read. These results are combined in a three-dimensional diagram. This representation provides the ability to make a precise selection of bio-based or recycled materials for polymer AM.
Liquid Hydrogen Storage Tank Virtual Crashworthiness Design Exploration for Civil Aircraft
Authors: Gallois A , Giannopoulos I K , Theotokoglou E E 
Published: February 2024

Abstract
Civil aviation industry is researching for alternative fuel energy sources to substitute current hydrocarbon-based aviation fuels. Carbon free emissions flights could be achieved with fuels like Hydrogen either through combustion or via electricity producing fuel cells. It is of great importance to explore the airframe designs to house Hydrogen in its cryogenic liquified state. The objective of the study herein was to provide a conceptual qualitative analysis related to the crashworthiness behaviour of civil aircraft carrying liquid Hydrogen fuel storage tanks. The design parameters of interest were the storage tank location in the airframe, the structural energy absorption following crash landing scenarios and the structural deformation of the structure surrounding the tanks, penetrating the survival space of the occupants. Several structural design arrangements were proposed and compared. Simulation results indicated that the optimal location for the fuel storage greatly depends on the actual aircraft layout as well as on the future civil aircraft airworthiness requirements that are still under development for that type of fuel energy source.
Dissipation closure of fluid turbulence from energy spectrum
Authors: Balonishnikov A M , Kruchkova J V 
Published: February 2024

Abstract
Direct method of the turbulence closure consists of obtaining expression for small-scale velocity and inserting this expression in the Reynolds tensor and in the transport equations for turbulent energy, dissipation, eddy and so on, implementing some averaging. Previously such approaches were used for Burgers-Lundgren vortex. Here we used ‘naïve’ perturbation method for the transport equation for small-scale velocity incompressible fluid - the equation suggested by one of the authors earlier. It is assumed that the energy spectrum of turbulence is given.
Photoconductivity and bandgap of binary impurity - doped crystalline silicon
Authors: Sh Mavlyanov A , Khakkulov M K , Sattarov O E , Akbarova N A , Yakubov D Z 
Published: February 2024

Abstract
The paper presents the results of study of the photoconductivity spectra of sulfur- and <sulfur+manganese>-doped samples of silicon (Si<S>, Si<MnS>) under dark conditions and while samples were subjected to constant light in forward and reverse switching modes. The paper also presents the calculation results of the value of the band gap (Eg
) of <sulfur+zinc> -doped silicon samples (Si<ZnS>). Spatial analogues of generally accepted GaAs structure such as Si2Mn2S and Si2Zn2S are hypothesized to be brought up in the result of above mixed dopings. Tentative investigations of the short-circuit current and open-circuit voltage of p-n-structures, as well as the photoconductivity of such structures, together with the analysis of their lux-ampere characteristic might serve for proposing potential varying band structures for solar cells.
Corrosion resistance of the modified surface of AISI 316L steel
Authors: Dasaev M R , Kalakutskaya O V , Ryzhenkov O V , Tkhabisimov A B 
Published: February 2024

Abstract
The paper is devoted to the study of the effect of laser processing on the wettability and corrosion resistance of the surface of experimental samples made of AISI 316L sheet steel and samples made by printing from AISI 316L steel powder using selective laser melting technology. As a result of the studies, it was established that laser texturing of the relief with the subsequent formation of molecular layers of surfactants on a steel surface helps to achieve higher contact angle values, however, such treatment leads to a decrease in corrosion resistance.
Theoretical study of the influence of gas phase turbulent disturbances on the kinetics of ultrasonic coagulation of PM2.5
Authors: Khmelev Vladimir , Nesterov Viktor , Bochenkov Alexander 
Published: February 2024

Abstract
A numerical model of ultrasonic coagulation of PM2.5 aerosol particles in three-dimensional vortex and turbulent acoustic flows is proposed in the article. The model is intended to identify the possibility of increasing the efficiency of the process. A numerical analysis of the model using the example of PM2.5 aerosol made it possible to establish that the presence of three-dimensional turbulent disturbances leads to the fact that the coagulation efficiency of PM2.5 reaches almost 100% at a sound pressure level of no more than 165 dB.
Simulation of light scattering on a deformed gas bubble
Authors: Gordeeva Varvara 
Published: February 2024

Abstract
The paper describes simulating light scattering of an electromagnetic field on a deformed gas bubble suspended in a liquid. The field intensity distributions around the deformed bubble were obtained. It turned out that field scattering increases with bubble deformation up to a certain limit of the deformation coefficient A (relative deformation amplitude). At A = 0.7 and higher, the scattering remains independent of the magnitude of the deformation.
Application of sand mold casting modelling for casting pump volute
Authors: Aripov A R , Vokhidov B R , Asrorov A A , Sayfullaev F I , Kurbonov M N 
Published: February 2024

Abstract
This work details the development of a gating system for sand mold casting utilizing advanced computer technologies in the casting industry. The study employs advanced methods to manufacture a component referred to as the pump volute. Made from the EN-GJN-HV600(XCr23) alloy, this component displays superior technological characteristics, notably for the production of sand mold gravity castings. SolidWorks software is utilized to generate 3D models of the component and the fill system based on predetermined dimensions. Subsequently, the component is imported into Pro-CAST software to conduct a simulation. Various time parameters were inputted during the study. Post-simulation, defects were scrutinized, and the casting system underwent modification to eliminate them. The process was iterated on the software and its efficacy was verified to be faultless.
Simulation and control of ball mills under uncertainty conditions
Authors: Mukhitdinov Djalolitdin , Kadirov Yorkin , Boybutayev Sanjar , Boeva Okila , Babakhonova Umida 
Published: February 2024

Abstract
The article considers a model for monitoring the grinding process in a ball mill, where the ground material itself is involved in grinding. The constructed model takes into account the uncertainties associated with the quality indicators of the processed ore at the beginning and in the process of grinding, the influence of the quality indicators of the ore in terms of particle size and their hardness on the kinetics of grinding. The non-linearity of the technological process and uncertainties are taken into account in the control system aimed at stabilizing the system. The model is presented in the form of four blocks describing the main links of the mill plant. At the output of the model, the participation of the mill, the volume of the sump are determined, and the particle size at the outlet of the hydrocyclone is estimated. The operation of the hydrocyclone control system is demonstrated, which controls the loading density and particle size depending on the change in ore quality.
A multiparameter mathematical model for the problem of nonlinear filtration of fluids in two-layer media
Authors: Kayumov Shukur , Arzikulov Golib , Bekchanov Sherzad , Zuyadullayeva Shohida 
Published: February 2024

Abstract
In the realm of fluid dynamics and porous media, the nonlinear filtration of fluids in two-layer media presents a complex and intriguing challenge that demands a comprehensive mathematical framework for accurate representation and analysis. This paper introduces a multiparameter mathematical model designed to elucidate the intricacies of fluid filtration in heterogeneous environments, specifically focusing on two-layer media. The authors research the construction of a multiparameter mathematical model and numerical solution of nonlinear problems of the theory of filtration of unstructured and structured fluids in hydrodynamically connected multilayer formations with different characteristics. The developed models and solution algorithms were tested on hypothetical data.
Design features of drilling equipment elements using materials with shape memory effect
Authors: Balaev Etibar , Shostak Nikita , Samarin Mikhail , Klepikov Dmitry 
Published: February 2024

Abstract
Alloys exhibiting thermoelastic phase transformations are getting more and more used in different industries. This is due to the shape memory effect and pseudo-elasticity (sometimes termed “superelasticity”) they exhibit, which can considerably improve the performance characteristics of various technical systems. One of the highest reliability and durability criterias are applied to equipment for drilling oil and gas wells, and according to this the above-described smart materials and the phenomena they exhibit have been gradually implemented in the oil and gas industry. This article analyzes the developed design of roller cone bits elements and proposes its assembly method, and presents its comparison with currently existing designs. Computational research and computer analysis of a drilling equipment assembly containing parts made of shape memory materials were performed, these studies showed significant advantages of the proposed method.
Improving reliability and service life of industrial products via composite electrochemical coatings
Authors: Yu Kireev S , Sinenkova S R , Kireeva S N , Naumov L V 
Published: February 2024

Abstract
The paper considers a method for obtaining hard, wear-resistant composite electrochemical tungsten carbide-cobalt (WC-Co) coatings with high adhesive strength. Such coatings are used to enhance surface hardness and wear resistance of parts and tooling. It is challenging to obtain hard, wear-resistant coatings on the surface of industrial parts and tooling. It is proposed to use an eco-friendly cobalt electrolyte with tungsten carbide additive for the electrodeposition of composite electrochemical coatings. The electrodeposition technique provides high output and quality of the applied coating with the ability to control its thickness.
Effect of magnetic field on impedance characteristics in manganese sulfide Mn0.9S
Authors: Kharkov A M , Mashkov P P , Bandurina O N , Runov R V , Gelgorn A V 
Published: February 2024

Abstract
Manganese sulfide with a lack of manganese cations in the lattice is being studied. Samples that are single-phase and have a cubic structure have been certified. The impedance components were measured over a wide range of frequencies and temperatures without a magnetic field and in a magnetic field. The real and imaginary parts of the impedance as a function of temperature are described in the Debye model. The relaxation time of current carriers is found from the impedance hodograph. The change in impedance components in a magnetic field is described in a model of an inhomogeneous electrical medium.
Comparative structural analysis of samples of transpedicular screws from titanium alloys
Authors: Pyatykh A , Tikhonov A , Ulakhanov N 
Published: February 2024

Abstract
The article presents studies of transpedicular screws made of titanium alloy BT6. A metallographic and microstructural analysis of screw blanks, prototypes of transpedicular screws made of BT6 alloy and commercially produced screws made of Ti-6Al-4V was performed. Specimens of transpedicular screws were manufactured using the vortex thread cutting method on a CITIZEN Cincom K16E-VII automatic lathe. The microgeometry of the screw surface was created by sandblasting using quartz sand as an abrasive material. Studies have shown that experimental and foreign samples of transpedicular screws have a similar microstructure, consisting of globular crystals of the β-phase located in a light matrix of the α-phase. The microhardness of the rod part of the screw made of Ti-6Al-4V alloy was 312...338 HV, the microhardness of the material of the prototypes was from 264 to 394 HV. Conclusions have been drawn that determine the feasibility of choosing rods made of titanium alloy BT6 as a blank for the manufacture of transpedicular screws.
The concept of «Complexity» in the problems of condensed matter physics: fundamental and applied aspects
Authors: Kh Ashurov M , Oksengendler B L , Kh Suleymanov S , Zatsepin A F , Maksimov S E , Karimov Z I , Nikiforova N N , Iskandarova F A 
Published: February 2024

Abstract
Problems of radiation effects of living and inanimate objects are considered within the framework of the concept of complexity. Basic models for the manifestation of the effects of spin chemistry and quantum entanglement in the processes of subthreshold radiation physics have been constructed
Determination of reflection coefficient contrast in medium over hydrocarbon accumulation
Authors: Yanushkevich V , Dauhiala D , Pitolin U , Babamuratov K , Urozov M 
Published: February 2024

Abstract
The article analyses the method of searching for hydrocarbon accumulation on the basis of determining the reflection coefficient contrast. Experimental research on hydrocarbon accumulation of the Republic of Belarus is carried out. Was used a method for estimating the reflectivity of the medium over hydrocarbon accumulation under the influence of electromagnetic waves with linear polarization based on the contrast of reflection coefficients between the measurement points of the investigated profile and the calibration measurement point located outside accumulation. The anomalous behaviour of the reflection coefficient contrast was found to correspond to the hydrocarbon boundary. The results of experimental research confirmed the increase in the accuracy of determining the boundaries of hydrocarbon accumulation based on the method of determining the reflection coefficient contrast. The obtained research results can be used in exploration geophysics.
Constructions of statistical estimates of digital measurement error in the case of small samples
Authors: Ershov D S , Malahov A V , Levina T A , Khayrullin R Z 
Published: February 2024

Abstract
The paper presents a computational-experimental method for the construction of statistical estimates of the error of digital measurements carried out on complex technical objects with metrological support. The algorithm of construction of the estimation of the distribution density function of random error of measurements on the basis of complex application of methods of the theory of characteristic functions, the theory of Lie operator series and methods of statistical modeling in the processing of a limited amount of statistical information in the conditions of small samples is described. The solution of the practical problem on the construction of the estimation of the measurement error distribution density and the problem on the zero mark of the measuring instrument in the probabilistic formulation is given. The presented computational and experimental method can be used to construct statistical estimates for the probability distribution density of the general type, including those given by implicit functions, characteristic functions and operator series.
Investigation of the combustion process in a dual-fuel engine
Authors: Lopatin O P 
Published: February 2024

Abstract
Modeling of in-cylinder processes occurring in a dual-fuel engine is necessary to obtain the ignition delay period as a function of the angle of rotation of the crankshaft and the subsequent calculation of its effective and environmental indicators. There is a need to identify the theoretical dependence of the fuel combustion process on the parameters that determine the operating modes of a dual-fuel engine, which leads to the need to create a mathematical model that allows the most accurate description of the combustion process, taking into account the maximum possible number of factors. The paper considers the optimization of the parameters of the workflow and the prediction of the performance of the projected and existing dual-fuel engines.
Experimental study on heat power of wet and pipe sections of wet/dry cooling tower with extended surface pipe exchanger
Authors: Madyshev I N , Kharkov V V , Mayasova A O , Zinurov V E , Khabibullin R R 
Published: February 2024

Abstract
A hybrid system for recirculated water cooling of industrial enterprises is proposed. The major feature of the cooling system is a wet/dry cooling tower with an inner pipe exchanger. To enhance the heat transfer process, the outer surface of the heat exchanger pipe has fins. Design and function of the experimental setup are described. The goal of this work is to evaluate experimentally the heat power of the wet and pipe sections of the cooling tower. Results were presented as dependencies of the heat power in the wet/dry cooling tower on the mean gas velocity (from 0.89 to 3.20 m/s) and the ratio of the weight flow rates of the gas/liquid phases at various irrigation rates (13.7-35.6 m3/(m2.h)).
Preliminary purification of the gas-liquid stream from hydrocarbon condensate, water and mechanical impurities
Authors: Ivanov A Y , Babin V V , Kardash A A , Romanenko M Y , Rybin V V 
Published: February 2024

Abstract
The paper discusses the process plan of the piston compressor package as well as the design of the gas separator. A technical proposal has been developed to improve the preliminary purification of the gas-liquid stream from hydrocarbon condensate, water and mechanical impurities. With the help of modern computer technologies, the design of the inlet device in the separator has been developed. The operation of the gas separator was simulated after the application developed by the devices. With the help of the program, the results of the study of the gas separator operation are presented.
Assessing the relative importance of dry-season incoming solar radiation and water storage dynamics during the 2005, 2010 and 2015 southern Amazon droughts: not all droughts are created equal
Authors: Liu Shuang , McVicar Tim R , Wu Xue , Cao Xin , Liu Yi 
Published: February 2024

Abstract
Three severe droughts impacted the Amazon in 2005, 2010, and 2015, leading to widespread above-average land surface temperature (LST) (i.e. positive thermal anomalies) over the southern Amazon in the dry season (Aug–Sep) of these years. Below-average dry-season incoming solar radiation (SW↓) and terrestrial water storage anomaly (TWSA) were simultaneously observed in 2005 and 2010, whereas the opposite was observed in 2015. We found that anomalies in precipitation (P), SW↓, and TWSA combined can well explain dry-season thermal anomalies during these droughts (average R2–0.51). We investigated the causes for opposing anomalies in dry-season SW↓ and TWSA, and found different hydro-climatological conditions preceding the drought-year dry seasons. In 2005 and 2010, P was considerably below average during the wet-to-dry transition season (May–July), causing below-average TWSA in the dry season that was favorable for fires. Increased atmospheric aerosols resulting from fires reduced solar radiation reaching the ground. In 2015, although below-average dry-season P was observed, it was above the average during the wet-to-dry transition season, leading to reduced fires and aerosols, and increased dry-season SW↓. To further examine the impact of opposite hydro-climatological processes on the drought severity, we compared dry-season LST during droughts with the maximum LST during non-drought years (i.e. LSTmax) for all grid cells, and a similar analysis was conducted for TWSA with the minimum TWSA (i.e. TWSAmin). Accordingly, the regions that suffered from concurrent thermal and water stress (i.e. LST > LSTmax and TWSA < TWSAmin) were identified. These regions are mainly observed over the southeast in 2005 and southern Amazon in 2010. In 2015, large-scale dry-season thermal stress was found over central and southeast Amazon with little water stress. This study underlines the complex interactions of different hydro-climatological components and the importance of understanding the evolution of droughts to better predict their possible impacts on the Amazon rainforest.