bluuebunny/crossref_metadata_2025_split huggingface dataset:
What looks native-like may not necessarily be native-like
Authors: Xu Lilong , Yuan Boping 
Published: September 2023

Abstract
A substantial body of research has investigated null arguments in L2 Chinese, showing that they can be
native-like. However, recent linguistic research has demonstrated convincingly that some ‘missing’ arguments in Chinese should be
viewed not as ‘null’ arguments but as a result of movement and ellipsis. These advances necessitate a revaluation of the issue of
‘null’ arguments in previous L2 studies which largely overlooked the role of ellipsis in accounting for missing arguments in L2
Chinese. To fill the lacuna, this study recognises the above recent advances and examines whether missing objects in English
speakers’ L2 Chinese parallel sentences are a result of verb raising and VP ellipsis and are genuinely native-like. Results of a
picture-description task and an acceptability judgement task suggest that although L2ers, like native Chinese speakers, can accept
and produce missing objects in Chinese, their native-like performance is driven by mechanisms different from those of native
Chinese speakers (i.e., the missing objects are erroneously used as null objects in L2 Chinese). The findings advance our
understanding of L1 vs. L2 different mechanisms for phonetically unrealised objects in Chinese, suggesting that what looks
native-like in L2 may not necessarily be native-like.
Ultra-broadband solar energy absorber based on Ti and TiN from visible to mid-infrared
Authors: Li Xin , Zhang Zuoxin , Feng Hengli , Zhou Yaxin , Sun Pengfei , Nie Sihan , Su Lijing , Gao Yang 
Published: September 2023

Abstract
In this work, a metamaterial absorber based on titanium (Ti) and titanium nitride (TiN) is proposed. Theoretical calculation by finite-difference time-domain (FDTD) method shows that the absorber could achieve a bandwidth of 3720 nm in the spectrum range of 280 nm − 4000 nm. The average absorptivity of the absorber can reach 96.9%. The physical mechanism of the absorber is analyzed from the impedance matching theory and electromagnetic field distribution. Furthermore, simulation results illustrate that the absorber is polarization-insensitive and allows a wide range of incident angles. The absorption spectrum is basically consistent with that of air mass 1.5 (AM1.5). And it can achieve high thermal conversion efficiencies over a wide range of temperatures. These results indicate that the absorber has a good development prospect in solar energy collection.
Extracting the gamma-ray source-count distribution below the Fermi-LAT detection limit with deep learning
Authors: Amerio A. , Cuoco A. , Fornengo N. 
Published: September 2023

Abstract
We reconstruct the extra-galactic gamma-ray source-count distribution, or dN/dS, of resolved and unresolved sources by adopting machine learning techniques. Specifically, we train a convolutional neural network on synthetic 2-dimensional sky-maps, which are built by varying parameters of underlying source-counts models and incorporate
the Fermi-LAT instrumental response functions. The trained neural network is then applied to the Fermi-LAT data, from which we estimate the source count distribution down to flux levels a factor of 50 below the Fermi-LAT threshold.
We perform our analysis using 14 years of data collected in the (1,10) GeV energy range. The results we obtain show a source count distribution which, in the resolved regime, is in excellent agreement with the one derived from cataloged sources, and then extends as dN/dS ∼ S
-2 in the unresolved regime, down to fluxes of 5 · 10-12 cm-2 s-1. The neural network architecture and the devised methodology have the flexibility to enable future analyses to study the energy dependence of the source-count distribution.
Bayesian analysis for rotational curves with ℓ-boson stars as a dark matter component
Authors: Navarro-Boullosa Atalia , Bernal Argelia , Vazquez J. Alberto 
Published: September 2023

Abstract
Using Low Brightness Surface Galaxies (LBSG) rotational curves we inferred the free parameters of ℓ-boson stars as a dark matter component. The ℓ-boson stars are numerical solutions to the non-relativistic limit of the Einstein-Klein-Gordon system, the Schrödinger-Poisson (SP) system. These solutions are parametrized by an angular momentum number ℓ = (N - 1)/2 and an excitation number n. We perform a bayesian analysis by modifying the SimpleMC code to perform the parameter inference, for the cases with ℓ = 0, ℓ = 1 and multi-states of ℓ-boson stars. We used the Akaike information criterion (AIC), Bayesian information criterion and the Bayes factor to compare the excited state (ℓ=1) and the multi-state case with the ground state (ℓ=0) as the base model due to its simplicity. We found that the data in most galaxies in the sample favours the multi-states case and that the scalar field mass tends to be slightly bigger than the ground state case.
Increasing the efficiency of the forming process by the DRECE method
Authors: Szkandera P , Rusz S , Švec J , Hilšer O , Pastrňák M , Zabystrzan R 
Published: September 2023

Abstract
The DRECE method is a progressive method for forming sheet metal strips using the principle of severe plastic deformation (SPD). The DRECE method is characterized by extruding the sheet metal strip with a forming device which creates a forming angle of 108 ° in the deformation zone. During the practical verification of the DRECE method, it was found that the materials formed by the method show a significant increase in mechanical properties after the first pass through the forming equipment while maintaining sufficient ductility of the materials. With each subsequent pass of the material through the forming device, the mechanical properties increase. For the subsequent industrial use of the DRECE method, the key technological parameter of the forming equipment is the feed speed of the sheet metal strip. At present, the forming device makes it possible to regulate the feed speed of the sheet metal strip in the range of 10 - 100 mm / s. The device allows continuous sensing and recording of torque, extrusion force and feed rate of the sheet metal strip during the forming process. These facts are very important for the subsequent use of the method in industrial practice.
Comparison of physical, mechanical and chemical properties of barrel steel 32CrMoV12-10 and nitriding steel 31CrMoV9 after nitriding in gas
Authors: Coufal V , Hájek J , Průcha V , Šimeček J , Kučerová L , Jirková H 
Published: September 2023

Abstract
32CrMoV12-10 and 31CrMoV9 steels are used not only for components in the automotive industry, but also for firearms parts in the weapons industry. In these applications, high strength and surface layer hardness is required while maintaining the toughness of the core, which is achieved by nitriding. The aim of the work was to determine which of the steels exhibits better physical, mechanical and chemical properties after nitriding in a gaseous atmosphere. Metallographic samples were made to compare the structure of the nitride layer after nitriding. Hardness and fracture toughness were measured and Charpy impact testing and corrosion resistance evaluation were also carried out. The test results revealed that 31CrMoV9 steel shows better physical and chemical properties than 32CrMoV12-10 steel.
Material Properties of Nickel Based Cold Spray by Means of Small Specimens
Authors: Chocholousek M , Bricin D , Spirit Z 
Published: September 2023

Abstract
The article is aimed on material properties evaluation of Ni and NiCr Cold Spray layers by means of proportional small specimens. For the purpose of testing, various cold spray layers were prepared. Spraying with nozzle for inner tube application from two NiCr powders of different particle sizes and from Ni powder of one particle size was applied. In addition, spraying with nozzle type for outer tube applications from same Ni powder was applied too. The evaluation is aimed on mechanical properties and metallographic analysis of cold spray layers as received and after defined heat treatment, comparing small and standard testing specimens. It provide overview of the tensile properties at room temperature and the microstructure of used powders and final cold sprays. Ultimate tensile strength, yield strength, hardness and plastic elongation are evaluated from the mechanical point of view. Metallographic analysis is focused on particle size in powders and splat size in manufactured layers. Porosity of sprayed layers is evaluated on tested specimens and the influence of specimen dimensions is discussed.
Development of specialized disk emitters for the formation of high-intensity ultrasonic fields in gaseous media
Authors: Dorovskikh Roman , Puzhaykina Anna , Tertishnikov Pavel , Shalunov Andrey , Nesterov Victor 
Published: September 2023

Abstract
The article presents various types of emitter designs and schemes of emitting surfaces for the formation of ultrasonic fields with different characteristics and directivity. 4 types of emitters have been developed and their main characteristics have been determined. It has been established that a radiator with a flat frontal surface provides 167 dB and makes it possible to intensify a number of technological processes in the near zone (up to 1 meter), such as coagulation and drying. An emitter with a step-variable surface and predominant radiation of one phase of oscillations makes it possible to create a homogeneous ultrasonic field in the air at a sound pressure level of 155-157 dB at a distance of up to 2 meters to the emitter. Focusing radiators allow to provide sound pressure level up to 173 - 177 dB in the focus (at a distance of 0.3 m), while in the far zone the intensity drops significantly (up to 145-150 dB).
Regulation of the fuel injection advance angle in a transport diesel engine
Authors: Markov V A , Furman V V , Plahov S V , Shlenov M I , Yao L M , Siluyanichev A M 
Published: September 2023

Abstract
The toxicity indicators of exhaust gases of a diesel engine largely depend on the quality of the fuel supply process. The possibility of a significant improvement in the toxicity of the exhaust gases of a diesel engine by optimizing the phase of the start of fuel supply - the fuel injection advance angle is shown. To assess the influence of the fuel injection advance angle on the dynamic performance of the engine and the toxicity of exhaust gases, a mathematical model of the engine has been developed. The model contains differential equations for the main elements of the combined engine - its piston part, turbocharger, in take and exhaust pipelines. These equations include polynomial dependences of the main engine parameters on its operating parameters. The object of research was diesel type D-245 (4 ChN 11/12.5) produced by the Minsk Motor Plant. Calculations of the acceleration of the engine with a variable fuel injection advance angle have been carried out. The influence of the law of regulation of the advance angle of fuel injection on the duration of the transient process and emissions of normalized toxic components is determined.
A study of surface morphology of Fe/p-Si hybrid structure using atom force microscope
Authors: Arzikulov E U , Nurimov A D , Axrorov S Q , Mamatqulov N 
Published: September 2023

Abstract
p-Si substrate was cleaned by chemical means. After the cleaning, iron thin film was deposited on the silicon substrate by electron beam evaporation method with high purity Fe target. Then, the roughness parameters of the sample after chemical cleaning and after obtaining a thin layer were compared. Surface roughness measurement of the iron thin film in the nanometer scale can be accurately determined using the AFM. Apart from the average roughness, all the roughness parameters of the surface increased. The average roughness, average height, root mean square roughness, and other parameters are used to analyze surface morphology.
Investigation of stress-strain state of coil of tubular furnace radiant chamber at different arrangement of intermediate support
Authors: Kovshova Yu S , Rubtsov A V , Chen A I 
Published: September 2023

Abstract
The coils of radiant chambers of tubular furnaces are operated under especially loaded conditions in terms of temperature stress distribution. It is in the radiant sections that the feed is heated to the required maximum temperatures. Also, part of the coil structure may be in close proximity to the burners and exposed to an open flame to form superheating zones. In this regard, the elements of the coil can deform and prematurely collapse. One of the most important roles is played by the support elements of the coil in the form of suspensions, brackets, etc., which serve to prevent sagging of the coil pipes. An important role is played by the optimal location of the support elements of the coils during design in order to prevent pipe sagging during operation. In the era of rapidly developing digital technologies, the problem of optimal location of support elements at the coil, taking into account the peculiarities of the design, operating parameters, and the intensity of thermal radiation, can help solve specialized software complexes. Special programs develop a coil model taking into account all the necessary parameters and characteristics, both material and technological process. This makes it possible to detect zones of concentration of increased stresses and maximum deformations. Therefore, the actual work is the modeling of the stress-strain coil of the radiant coil, taking into account the different locations of the support elements.
Technological principles for microtexturing the operating surfaces of ceramic cutting inserts by electrical discharge machining
Authors: Volosova M A , Okunkova A A , Fedorov S V , Kolosova N V , Gkhashim K I 
Published: September 2023

Abstract
The article describes the technological principles of electrical discharge machining of the surface layer of SiAlON dielectric ceramics based on the artificial creation of conductive conditions of the ceramics’ surface layer, making it possible to form microtextures such as microgrooves and microwells/holes. It has been established that the processing stability between the electrode tool and the ceramic insert is increased by the deposition of electrically conductive coatings to ceramic inserts and supplying finely dispersed ZrO2 and TiO2 assisting powders into the interelectrode gap merged in a dielectric medium. The resistance tests carried out have shown that the use of compounds based on hard thermostable nitrides of refractory metals (AlCrTiNbSi)N and TiN-(AlCrTi)N as coatings with subsequent microtexturing provides a mutually reinforcing effect and makes it possible to increase the wear resistance of ceramic inserts up to 2.6 times when turning an Inconel 718 heat-resistant nickel alloy.
Certain concepts and definitions of the physical process of wear of friction discs of sewing machine clutches
Authors: Kh Dustova F , Kh Babadjanov S 
Published: September 2023

Abstract
The article covers analytical research of the performance of the pads of the friction clutch of the sewing machine. The results of research showed that the wear resistance of the pads decreases with increasing temperature. The wear resistance of pads made of different materials tested on the same type of friction clutch of sewing machine is different. The research has been carried out to determine the maximum value of the specific work of slipping and thermal impulse which determines the characteristics of the temperature field of the friction pair which significantly affects the wear resistance of the friction interface. The wear resistance of friction clutches which are one of the main characteristics that determine the reliability and durability of the friction assembly has been studied.
Technological principles for removal of defective surface layer on grinded ceramic products by etching with accelerated argon
Authors: Volosova M A , Mitrofanov A P , Migranov M S 
Published: September 2023

Abstract
The article describes the technological principles and equipment for “dry” ion-plasma etching of the surface layer of SiAlON dielectric ceramics and subsequent deposition of (TiAl)N coatings. The proposed approach made it possible to ensure the high-performance removal of a defective layer formed during diamond grinding from the ceramic samples’ surface. Accelerated argon atoms with an energy of 5 keV are used as a source of energy impact on ceramic samples, which bombard the surface layer and ensure its sputtering at a rate of 9 μm/h. It is shown that the (TiAl)N coating deposition on ceramic samples after the preliminary removal of the defective layer reduces the volumetric wear under abrasive action by a factor of 2.6 compared to the initial samples subjected to diamond grinding.
Dynamic analysis of physical and mechanical forces acting on the needle of a shoe sewing machine in the process of sewing leather
Authors: Safarov Nazirjon , Abrorov Akbar , Abdullaev Laziz 
Published: September 2023

AbstractThe article covers thermal treatment of the working surface of the needle of shoe sewing machines with laser beams. The degree of influence of mode factors on the quality of sewing needles treated with laser beams has been theoretically studied. A mathematical model for processing a sewing needle with a laser beam, which establishes the relationship between mode factors and the quality of the working part of the needle has been developed. The model allows evaluating the influence of each factor on the quality of the needle. An equation showing that the planetary and vertical movement of the needles have the greatest influence on the quality of the processed needles has been obtained.
Strength analysis of flat manhole cover in case of change of location and inclination angle of two mutually intersecting scratches
Authors: Rubtsov A V , Kulakov P A , Gracheva V V , Afanasenko V G , Bikmukhametova M A , Zubkova O E , Greb A V 
Published: September 2023

Abstract
Mechanical damages of the main structural elements of the process equipment of hazardous production facilities are quite often detected during the revision process after repairs when assessing the quality of the work performed. One of the most common mechanical damages on the surface of parts and assemblies of technical devices includes scratches and risks. Significant scratches and risks that have a relatively large area and depth and limit the commissioning of the facility are subject to sampling and removal during re-repair. Superficial and non-extended scratches and risks do not belong to unacceptable defects, the technical device should not be taken into account, and further operation occurs with their presence. During further operation of the facility, such defects may not manifest themselves in any way, but may be high-voltage concentrators, which in the vast majority of cases are not critical. However, the presence of two or more scratches on the surface of the structural elements, their different location relative to each other, and therefore different mutual influence, can have a significant effect on the redistribution of zones and values of increased stresses on the surfaces where they are located. In the current regulatory and technical documents for diagnostics, these points are not considered, and accordingly are not taken into account. Therefore, the actual work is to perform a strength analysis of a flat manhole cover with two scratches, which have a different location on the surface, and a different angle of intersection relative to each other.
Limit state analysis of the thin-walled shell using a forming limit diagram and finite element modeling
Authors: Andrianov Ivan K , Feoktistov Sergey I , Chepurnova Elena K 
Published: September 2023

Abstract
The study considers the problem of estimating the limiting state of thin-walled cylindrical shells loaded with internal pressure. A diagram of limiting deformations is used as a method for estimating the limiting state of shells. The upper limit of permissible deformations satisfying the kinematic criterion of limiting deformation is determined based on the Side-Rice criterion. Using the finite element method, a series of numerical experiments on the loading of the inner shell at different heights of the loaded region in comparison with the diameter of the shell were carried out. Thus, the formulation of the problem made it possible to evaluate the effect of edge effects on the deformed state of a thin-walled shell. The results of the calculation of the limiting state of the shell can be used to develop a system for detecting cracks in turbine blades due to a system of thin-walled capsules under internal pressure.
Analytical dynamic modeling of damping of a multi-hierarchical mechanical system and mobile power engine shaft with the help of multi-mass rheological models
Authors: Matmurodov Farkhod M , Boboyev Xamza X , Nugmanov Ikram N , Mamirov Sherzod Sh 
Published: September 2023

AbstractThe article analytically modeled a multi-hierarchical mechanical system based on the method of multi-mass rheological models. Using this model, the ways of using as an example of obtaining and modeling the motor shaft of the damper-case of a mobile power vehicle are shown. The developed model makes it possible to find the amplitude-frequency characteristics of relative displacements, vibration velocity and vibration acceleration of moving mechanisms of mobile equipment.
Improving the fuel supply process of diesel locomotive
Authors: Markov V A , Furman V V , Plakhov S V , Shlenov M I 
Published: September 2023

Abstract
The quality of the fuel supply process is the main criterion for ensuring the required indicators of efficiency and environmental friendliness of a diesel locomotive. The electronic control system of the ESUVT.01 type for D50 type diesel (6 CHN 31.8/33) for fuel supply control is produced by JSC Penzadizelmash developed in LLC PPP Dieselavtomatika (Saratov) is presented. Optimizing the phase of the beginning of fuel supply – the advance angle of fuel injection (AAFI) shows the possibility of a significant improvement in fuel efficiency and toxicity of diesel exhaust gases. To assess the effect of the AAFI on the diesel locomotive performance, its experimental studies were carried out. The object of bench tests was a diesel generator set of type 1-PDG4D with the specified diesel and with a traction generator MPT-84/39. During the tests, the dependencies of diesel indicators on the AAFI were obtained. The necessity of optimizing the values of the AAFI in accordance with the engine operating mode is confirmed. Optimized values of the AAFI are obtained in the modes of diesel characteristics. The toxicity indicators of diesel exhaust gases and fuel efficiency with optimized characteristics of the AAFI are determined.
Quasi-static model for estimating the forces acting on a two-axle vehicle in the problem of trajectory stabilization by applying controlled differentials
Authors: Yu Dobretsov R , Bao L , Voinash S A , Zagidullin R R , Sabitov L S , Yakushev A M , Sokolova V A 
Published: September 2023

Abstract
The article considers the principles for determining the gear ratios of controlled inter-axle and inter-wheel power distribution mechanisms. The methodology is based on the analysis of the distribution of normal, tangential and lateral reactions during the movement of a car under the action of a given external force. The calculated dependences are given, which allow to evaluate the values of the reactions and to estimate the required gear ratios of the power distribution mechanisms. An example of a kinematic scheme of a controlled center differential is given. Prospects for using the mechanisms of this family are formulated. The structure of the control system for such mechanisms is considered.