bluuebunny/crossref_metadata_2025_split huggingface dataset:
Liquid Hydrogen Storage Tank Loading Generation for Civil Aircraft Damage Tolerance Analysis
Authors: Giannopoulos I K , Theotokoglou E E 
Published: February 2024

Abstract
The study presented is a preliminary approach and a proposal to the derivation of a loading spectrum for fatigue and damage tolerance analysis for civil aviation Liquid Hydrogen storage tanks. It is anticipated for the first generation of LH2 storage tanks for aviation to utilize metallic lightweight materials. Existing solutions are either too structurally heavy or with a short life span, both constraints making them unsuitable for aircraft vehicles were less mass and longevity is of paramount importance. The objective of the work was to provide suggestions for the generation of representative loading spectra for storage tank fatigue and damage tolerance preliminary design analysis and sizing.
Increasing the performance and service life of the brushes of the cotton gin under conditions of shock-bending loads
Authors: Saidov Bekhzod , Safarov Nazirjon , Kabulov Mukhammadali , Saidov Alisher 
Published: February 2024

Abstract
The purpose of this paper is to increase the service life of the brushes in the interaction of the puller brushes and the drum when cleaning cotton from large debris during the cotton removal process. The authors conducted an experimental study to determine the actual value of the number of impacts (touches) of the puller brushes on the surface of the saw drum. The angle of rotation of the serrated drum around its axis during the period of influence of the puller brushes on it was determined. The paper also describes determination of the average number of blows (touches) of the puller brushes on the saw drum.
Algorithm for improving the quality of mixed noisy images
Authors: Mamatov N S , Jalelova M M , Samijonov A N , Samijonov B N 
Published: February 2024

Abstract
Digital images are one of the effective means of receiving, transmitting, exchanging and expressing information. However, the digital image is not always of the expected quality, that is, as a result of the influence of various factors, noises appear in the image. This significantly reduces the accuracy and quality of the data in the image. Segmentation and recognition of objects from a low-quality image creates many additional problems. For example, it requires image quality enhancement based on powerful pre-processing algorithms. One such problem is to eliminate multiple noises in the image, and it is one of the pressing issues of digital image processing. This paper is devoted to solving the problem of image reconstruction by eliminating the mixed condition of Gaussian, salt-pepper and Poisson noises, which are common in digital images, in which one filter that optimally reduces each type of noise is selected and all combinations of them are applied to the mixed noise image to maximize the images. The idea of restoration has been put forward. The quality of the reconstructed images was evaluated by the NIQE criterion, which is one of the no-reference quality indicators, and a rule for automating the image processing process was proposed based on its values.
Physical and mechanical calculation of the efficiency of a composite kick shock absorber and the friction force with the material
Authors: Djuraev Anvar , Mansurova Munisa , Bozorova Farida 
Published: February 2024

Abstract
The article presents an effective structural scheme with a rubber shock absorber for the sewing machine. As a result of the theoretical research, analytical methods were used to calculate the coefficient of uniformity of the rubber shock absorber with a component bearing and to determine the friction force between the bearing and the material being sewn. Parameter connection graphs were determined. Based on the results of the analysis, the parameters of the proposed compositional reaction node were developed.
Development of an optimal mechanism for a solar-air collector for drying thermolabile products
Authors: Khudoynazarov F J , Djuraev H F , Mizomov M S , Kh Fayziev A 
Published: February 2024

Abstract
The article presents theoretical and experimental studies about the alternative construction of energy-efficient solar air collector that generates heat based on alternative energy sources for the drying process of agricultural products. In particular, the geographical latitude of the place (φ), the angle of elevation of the sun to the horizon (h°), the angle of deviation of the sun (δ), and τ the interrelationships between the sun’s hour angles (τ) were studied. The patterns of changes in the wet air and dry air parameters entering the solar air collector were analyzed. The mechanism of efficient use of the heat generated in the solar air collector was developed. The kinetics of the process of drying spices at low temperature was studied.B NNBB. 1
A method for controlling and maintaining the thickness of a liquid layer during ultrasonic spraying
Authors: Khmelev Vladimir N , Shalunov Andrey V , Genne Dmitry V 
Published: February 2024

Abstract
This work is described a method for indirectly controlling the height of the film of sprayed material on the oscillating surface of ultrasonic atomizer by changing the resonant frequency of the ultrasonic oscillator. The relevance of the development of this method is due to the need for the development and widespread use of the ultrasonic spraying method to solve the most pressing problems of modern industry. In this regard, there is a need to establish the dependences of the spraying performance on the height of the film of sprayed fluid on the oscillating plane of the atomizer and to create, based on the identified dependencies, a method for controlling and maintaining the necessary and sufficient height of the fluid film, the spraying of which will provide the best dispersion characteristics of the generated aerosol at a given spraying performance. As a result of the research, it was shown that in the operating range of film height of the sprayed fluid, the change in the resonant frequency can reach 100 Hz, which is sufficient to control the film height. This made it possible for the first time to develop a method for automatically controlling the ultrasonic spraying process, ensuring the maintenance of optimal modes of ultrasonic exposure (amplitude of vibrations of the spray surface) and the thickness of the sprayed fluid height.
The deformation behavior investigation of a polymers used as a sliding layer in a contact friction unit
Authors: Bogdanova A P , Kamenskikh A A , Nosov Yu O 
Published: February 2024

Abstract
The polymers and composites study of is to the present day an actual topic of many research scientists. Experimental studies of antifriction polymer and composite materials are widespread. But analyzing the performance of materials under different conditions does not lose its relevance. This is due to the limited data on the materials behavior in open sources, both statically and dynamically. The article deals with spherical bridge bearing manufactured by “AlfaTech”, Perm, Russia. The bearing includes a steel balancer with a ball segment in contact with the lower steel plate through a spherical protective antifriction layer. The material of the protective layer may vary. Several options for antifriction layer materials both polymer and composite are reviewed in the work. The geometry of structural elements influences its behavior. A particular effect is observed in elements made of plastic. The main part of parameters was considered in this article, such as thickness and physico-mechanical properties of polymer sliding layer. The article considers the value influence of the friction coefficient on the interaction of contact surfaces. It was obtained that the maximum values of contact parameters decrease with increasing sliding layer thickness. The paper deals with the description of viscoelastic behavior of modern polymers and composites used as sliding antifriction layers within.
A solution to the Ricquier problem for a high-order parabolic equation in an unbounded domain: questions of existence and stabilization
Authors: Bikkulov I M 
Published: February 2024

Abstract
The existence of a solution to the Ricquier problem with Dirichlet boundary conditions for one high-order parabolic equation in an unbounded domain is discussed. The convergence of the approximation using the Galerkin method of a generalized solution to the Ricquier problem is investigated. The dependence of behavior of the norm of the problem solution for large values of time on the geometry of an area unlimited in spatial variables lying at the base of the cylinder with a limited carrier of the initial function is considered. For a fairly wide class of unbounded domains, upper bounds for the solution of a mixed problem for a high-order parabolic equation are estimated, which are expressed in terms of simple geometric characteristics of the unbounded domain. The obtained upper estimations for the solution of the mixed problem are accurate.
Buoyancy effect dualism on drill string axial forces calculation
Authors: Kudryavtsev I V , Morozov S S , Mityaev A E 
Published: February 2024

Abstract
This paper discusses the use of two buoyancy schools in determining the axial forces in the drill string, which leads to the duality of the solution. The difference in the results in determining the true and effective force and their relationship with each other using the strength of stability were revealed. It is shown that only the true force can be used to calculate the stresses and deformations of the drill string elements, since their actual values correspond to this force. At the same time, taking into account the effective forces, it is possible to more fully use the actual stability of the drill string, increasing the permissible loads on the bit and increasing the penetration rate. Thus, the presence of two buoyancy schools and, accordingly, two types of axial forces, makes it possible to more accurately and comprehensively assess the operability of the drill string.
Mathematical modeling of the magnetic field generated by a network of parallel narrow capillaries
Authors: Kopyltsov A V , Dyuzhikova N A 
Published: February 2024

Abstract
A three-dimensional mathematical model was constructed that simulates the movement of red blood cells (RBCs) through narrow capillaries. The charges located on RBC membrane generate a magnetic field (MF) in the surrounding space. The movement of erythrocytes along a capillary network built from parallel narrow capillaries is considered. The distribution of magnetic field strength (MFS) in planes parallel to the plane of the capillary network has been constructed. In the plane of a parallel capillary network, the dependence of the maximum and minimum values of MFS on the distance between the centers of the capillaries has been determined. It is shown that as the distance between the capillaries decreases, the magnitude of MFS in the plane parallel to the plane in which the capillaries lie increases, and the difference between the maximum and minimum values of MFS decreases.
Building models of technological processes based on neuro-fuzzy technology
Authors: Yu Mamasodikova N , Siddikov I X , Dilmurodov X E 
Published: February 2024

Abstract
The work considers the issues of formalization of the extraction process in the form of a generalized regression neural network model, which are the basis for solving the problem of analysis and synthesis of the extraction process control system for obtaining petroleum products. An adaptive learning algorithm for a neural network model has been developed that is characterized by high speed and accuracy. A comparative analysis of the developed model with existing ones was made, which showed the effectiveness of the proposed algorithm for building the architecture of neural network models and learning the weight coefficients of the model.
Support software for plastic bending of waveguides on a rotary draw bending machine
Authors: Kudryavtsev I V 
Published: February 2024

Abstract
The paper addresses the problem of ensuring the bending quality of the waveguide on an automated pipe rotary draw bending machine by winding. This bending method is currently the most common, but has limitations on the allowable values of bend angles and radii, which ensure the accuracy and quality of the bend region geometry without losing the stability of the section shape in the form of wrinkles and ruptures. Modern requirements for minimizing dimensions and masses require the use of the minimum possible bending radii, which depend on the geometry of the section and the material of the work piece. Calculations to determine the limits of permissible bend parameters using general or special purpose programs are very time-consuming require high-performance computers and high qualification of the computing engineer. To solve this problem, it is proposed to create support software that, based on interpolation of results of more accurate calculations, allows you to determine the areas of permissible bend parameters for the selected shape and section dimensions, as well as the work piece material. This approach allows you to quickly obtain solutions for both the engineer in the design of the structure and the operator of the pipe bending machine and to obtain a product with guaranteed bending quality.
The influence of the mine dust mineral composition on the characteristics of thermal destruction processes
Authors: Blokhin D I , Dokuchaeva A I , Zakorshmennyi I M , Kobylkin A S , Koporulina E V 
Published: February 2024

Abstract
The article describes the results of comprehensive laboratory tests of mine dust samples taken from active mine faces in the Kuznetsk coal basin (Kemerovo region, Russia). The purpose of the experiments is to study the characteristics of thermal destruction processes in mine dust depending on its mineral composition. Based on the results of electron microscopy, the mineral composition of the dust samples under study was determined, and the quantitative relationships of the mineral phases composing the sample were assessed. Using thermogravimetric analysis the lower limits of thermal destruction intervals were established for samples of mine dust with different compositions and percentages of mineral inclusions. The practical significance of the results obtained is substantiated.
Power supply thermal analysis
Authors: Maykov O A , Kokhonkova E A , Potylitsyn V S 
Published: February 2024

Abstract
The article provides an analysis of heat removal from power elements in a low-power power source. The efficiency of cooling fuel elements using the free convection method without additional inclusion of active cooling is considered due to design limitations of the overall dimensions of the source. Calculation estimates were made using numerical modeling of the temperature regime of the source. The object of the study is an intrinsically safe power supply with size restrictions of 200×160×65 mm with an aluminum housing. The main heat-generating elements are power transistors with a power of 1 to 6 W, mounted on the heat-dissipating parts of the housing through an insulating gasket. For stable operation of semiconductors, a temperature regime is required without exceeding the transistor temperature of 85 ° C under standard environmental conditions at an air temperature of 20 ° C and a relative humidity of 20%. The authors analyzed the heat exchange between the model of the designed power supply housing and the air environment according to the parameter of the limiting temperature of heat-generating semiconductors in a steady state. Conclusions about whether the thermal operating conditions are adequately ensured for this case are made.
Application of the eddy current method for flaw detection of conductive tracks of printed circuit boards
Authors: Malikov Vladimir , Shmykova Polina , Voinash Sergey , Zagidullin Ramil , Vornacheva Irina , Koroyanov Alexey , Babanin Aleksandr 
Published: February 2024

Abstract
The article discusses the creation and testing of a hardware-software complex aimed at examining the conductive paths on printed circuit boards. The complex includes a tiny eddy current transducer and a measuring system specifically designed to work with the transducer. The proposed system, which combines software and hardware components, allows for the examination of small sections of metal objects. It enables the monitoring of electrical conductivity and the determination of conductivity distribution across the object’s surface and depth. The article provides detailed explanations of the key features of the measuring system and presents the experimental findings obtained by testing different printed circuit boards. These boards were examined under various conditions, including defect-free ones and those intentionally modified to simulate defects. Dependences between the eddy current transducer signal and the different conductive tracks were established, elucidating the relationship between the transducer’s response and the properties of the tracks.
Vulnerable voices: using topic modeling to analyze newspaper coverage of climate change in 26 non-Annex I countries (2010–2020)
Authors: McAllister Lucy , Vedula Siddharth , Pu Wenxi , Boykoff Maxwell 
Published: February 2024

Abstract
News media influence how climate change is represented, understood, and discussed in the public sphere. To date, media and climate change research has primarily focused on Annex I countries, or treated non-Annex I countries as a homogenous bloc, despite the global nature of climate change and its geographically uneven impacts. This study uses a mixed-method approach, combining machine learning (topic modeling), econometrics, and qualitative analyses, to investigate newspaper coverage of climate change in 26 non-Annex I countries. We compiled a dataset of 95 216 news articles (dated between 2010 and 2020 from 50 sources) in 26 lower-middle and upper-middle income non-Annex I countries. In line with previous research results, we find that most common topics represented are international governance of climate change, the economics of energy transitions, and the impacts of climate change. Advancing current research understanding, we also demonstrate heterogeneity in coverage between non-Annex I countries and discover that a country’s vulnerability to climate change is positively associated with the diversity of topics (based on an article-level entropy index) portrayed by its domestic news media outlets.
Quantifying landscape fragmentation and forest carbon dynamics over 35 years in the Brazilian Atlantic Forest
Authors: Broggio Igor S , Silva-Junior Celso H L , Nascimento Marcelo T , Villela Dora M , Aragão Luiz E O C 
Published: February 2024

Abstract
The Brazilian Atlantic Forest (AF) covers 13% of Brazil but retains only 26% of its original forest area. Utilizing a Morphological Spatial Pattern Analysis (MSPA), we generated 30 m spatial resolution fragmentation maps for old-growth and secondary forests across the AF. We quantified landscape fragmentation patterns and carbon (C) dynamics over 35 years using MapBiomas data between the years 1985 and 2020. We found that from 1985 to 2020 the forest suffered continuous fragmentation, losing core (nuclei forest fragments) and bridge (areas that connect different core areas) components of the landscape. About 87.5% (290 468.4 km2) of the remaining forest lacked core areas, with bridges (38.0%) and islets (small, isolated fragments) (35.4%) being predominant. Secondary forests (1986–2020) accounted for 99 450.5 km2 and played a significant role in fragmentation pattern, constituting 44.9% of the areas affected by edge effects (perforation, edge, bridge, and loop), 53.7% of islets, and comprising only 1.4% of core forest. Additionally, regeneration by secondary forests contributed to all fragmentation classes in 2020. Even with the regrowth of forests, the total forested area in the biome did not increase between 1985 and 2020. Deforestation emissions reached 818 Tg CO2, closely paralleled by edge effects emissions at 810 Tg CO2, highlighting a remarkable parity in C emissions between the two processes. Despite slow changes, AF biome continues to lose its C stocks. We estimated that around 1.96 million hectares (19 600 km2) of regenerated forest would be required to offset the historical C emissions over the analysed period. Hence, MSPA can support landscape monitoring, optimizing natural or active forest regeneration to reduce fragmentation and enhance C stocks. Our study’s findings are critical for guiding land-use policies focusing on minimizing emissions, promoting forest regrowth, and monitoring its permanence. This study offers biome scale, spatially explicit information, critical for AF conservation and management.
Prescribed burning and integrated fire management in the Brazilian Cerrado: demonstrated impacts and scale-up potential for emission abatement
Authors: Franke Jonas , Sena Barradas Ana Carolina , Borges Kelly Maria Resende , Hoffmann Anja A , Filho Juan Carlos Orozco , Ramos Rossano Marchetti , Steil Lara , Roman-Cuesta Rosa Maria 
Published: February 2024

Abstract
Fire management has proven successful in reducing deforestation, preserving biodiversity and mitigating greenhouse gas (GHG) emissions. After years of zero burning policies in fire-adapted ecosystems, and resulting increases in fire hazards and risks, countries are moving towards integrated fire management (IFM) including prescribed burning (PB). With a primary focus on biodiversity, Brazilian governmental organizations endorsed this paradigm shift in 2014, with the introduction of IFM in a number of protected areas (PA) of the Cerrado. Reducing high intensity mid/late dry season (M/LDS) fires through PB in the early dry season (EDS) has proven successful in other savanna ecosystems, with demonstrated mitigation potential as EDS fires are associated with lower GHG emissions. In the present study, Earth observation data were used to analyze the seasonality of active fires, burned areas and fuel loads. A dynamic performance benchmark (control-treatment paired sample test) was applied to assess the effectiveness of existing IFM activities in promoting emission abatement over the pre-covid period 2014–2019. Compared against the responses of PAs without IFM-PB, the PAs with IFM-PB showed significant increases in EDS fires (+137% hotspots) and EDS burned areas (from a share of 11.2% to 29.5% of the total yearly burned area). Fuel fragmentation through EDS-PB, tracked through calibrated fuel load maps, also led to a 62% reduction in burned areas in the IFM period 2014–2019. Combined M/LDS burned areas decreased from 85.1% of the total yearly burned area to a share of 67.7%. When applying the observed shift in fire seasonality and the effect of burned area reduction to all the PA of the Cerrado for the same period, we estimate an emission abatement potential of 1085 764 tCO2e/y. Given the fact that IFM followed a biodiversity-centred approach in the Cerrado, an emission abatement-centered approach could result in even higher abatement potentials.