bluuebunny/crossref_metadata_2025_split huggingface dataset:
Surface Properties of Pulmonary Surfactant Sampled by Bronchoalveolar Lavage and by Electrostatic Exhaled Aerosol Trapping
Authors: Mizev A , Shmyrov A , Pshenichnikova-Peleneva I , Shmyrova A , Mizeva I 
Published: June 2021

Abstract
The development of efficient methods for non-invasive collection of alveolar lining fluid (ALF) samples containing pulmonary surfactant (PS) components and the study of the surface activity of the obtained native material is relevant for the diagnosis of inflammatory pneumopathies of the lungs. The paper presents an electrostatic aerosol trapping (ESAT) mobile complex for capturing droplets of ALF contained in an exhaled air. Passing the exhaled air through the corona discharge area results in the aerosol droplets charging and their further transferring by electrostatic force into a water surface, where they accumulate forming an adsorbed layer. Additionally, ALF samples were collected using a bronchoalveolar lavage (BAL). The surface properties of the PS obtained by both methods have been examined using the capillary wave method, which was previously modified by the authors specifically for biomedical applications. Significant difference was found in the results obtained with ESAT and BAL in the group of healthy subjects, which can be explained by different origin of the samples obtained by these techniques. Furthermore, significant difference in surface properties was established in the samples collected from healthy volunteers and patient with disseminated tuberculosis, while we did not find significant differences in the limited inflammatory process. The results presented in the paper demonstrate high potential of the proposed non-invasive technique for clinical usage.
Experimental Study of Fatigue Damage Accumulation in Laminated Carbon Reinforced Fiber Plastics
Authors: Nihamkin Mikhail Sh , Solomonov Danil G , Voronkov Andrey A 
Published: June 2021

Abstract
It is necessary to achieve high fatigue strength in order to apply carbon reinforced fiber plastics (CRFP) for critical elements subjected to vibration. Gradual accumulation of fatigue damage is accompanied by changes in the material stiffness and natural frequencies. The purpose of this work is to found experimental data on the change of the elastic characteristics of layered CRFP as fatigue damage accumulates. The object of the study is standard samples made of unidirectional carbon/epoxy fiber with different layering schemes. The samples were subjected to fatigue tests under cyclic tension with constant amplitude. The test of each sample was stopped several times at different loading stages to execute experimental modal analysis and non-destructive inspection of the appeared defects. The found natural frequencies were used to solve the inverse problem of identifying the elastic parameters of the laminate monolayer: two Young’s modulus, shear modulus and Poisson’s ratio. As a result, the dependences of these parameters on the relative fatigue life were obtained. These dependences, together with the results of non-destructive testing, can be used to describe the process of fatigue damage accumulation and for the subsequent development of methods for the fatigue life prediction.
Mathematical Modeling of Fatigue Fracture at High-Frequency Bending Vibrations
Authors: Nikitin I S , Burago N G , Nikitin A D , Stratula B A 
Published: June 2021

Abstract
A two-criterion kinetic damage model is proposed to describe the development of the fatigue fracture process under cyclic loading. On this basis, a procedure is proposed for calculating the coefficients of the kinetic equation for various modes of fatigue fracture from low-cycle to very-high-cycle fatigue. A uniform numerical method has been developed based on an implicit approximation of the differential equation for damage. This method makes it possible to carry out an end-to-end calculation of the evolution of crack-like zones of fatigue fracture in the material without considering cracks in their classical sense, as well as to estimate the durability of samples from the first nucleation to macrofracture. Calculations were made of the fatigue fracture of specimens under long-term cyclic loading according to the three-point bending scheme with the development of crack-like fracture zones in the modes from HCF to VHCF. Comparison of numerical and experimental results for specimens of titanium alloys is carried out.
Experimental Study of the Strength Characteristics of a Modified Polymer Base Material for Use in Orthopedic Dentistry
Authors: Shuliatnikova O , Rogozhnikov G , Porozova S , Rogozhnikov A 
Published: June 2021

Abstract
Acquired defects of the maxillofacial region require orthopedic treatment. When choosing a structural material for the manufacture of a jaw prosthesis, it is necessary to provide for functional loads on the prosthesis during operation. Defects in the jaw bones require a structural material with high strength characteristics. The article deals with the method of increasing the strength of polyamide dental material with nanoscale titanium dioxide. Objective: to improve the strength characteristics of orthopedic structures made of polyamide. The study of the polyamide material was carried out on control and experimental samples, in which a modifying component was introduced by the method of dispersion reinforcement-nanoscale titanium dioxide in an amount of up to 1 wt.%. The three-point bending strength (σmax, MPa) and Young’s modulus (E, MPa) were experimentally studied. These criteria are indicative when assessing the strength of the basic structural materials from which removable dentures are made. These parameters take into account both vertical and horizontal functional loads, similar to the forces that arise when using removable dentures. The results of the study showed an increase in the maximum voltage by 8.4%, and the Jung module by 7.2% in samples with nanoscale titanium dioxide introduced into their composition to 1 wt. %. This study is of practical importance for orthopedic dentistry in cases where it is necessary to strengthen the structural base material in the manufacture of jaw prostheses for patients with acquired defects of the jaw bones, which reduces the risk of fracture of the base structures under the influence of functional loads.
Experimental Study of Dehumidified Air Convection by Holographic and Thermocouple Methods
Authors: Somov S A , Ivanov A S 
Published: June 2021

Abstract
Thermal convection of dehumidified air is studied experimentally under conditions close to normal (atmospheric pressure ≍ 740 mm Hg, temperature range T = 0…50 C). The study is based on fundamental experiment, which is focused on the physical aspects of thermoconcentration convection in fluids, undergoing first-order phase transitions of the “gas-liquid” type. The peculiar features of convection, caused by concentration changes of water vapor (as a result of its evaporation or condensation), are discussed in terms of dimensionless parameters. The couple of standard complementary experimental methods are used: holographic interferometry for visualization of convective flows and thermocouple method for heat flux measurements. Test experiments demonstrate and approve the design characteristics of the setup. The observations of convective flows in dehumidified air are demonstrated. Experimental setup is described in all details, including the original design of the cold heat exchanger (resembling a heat tube), proposed for next experiments with humid air.
Deformation of a sphere made of magnetoactive elastomer under a strong uniform magnetic field
Authors: Stolbov O. V. , Raikher Yu. L. 
Published: June 2021

Abstract
Magnetostriction effect of a spherical sample of a magnetoactive elastomer (MAE) is analyzed. In comparison with the preceding study, the consideration is done on a more realistic basis: taking into account saturation of the MAE magnetization in contrast to the former model where the magnetization was supposed to be linear whatever the field strength. This more thorough investigation has revealed that the striction-induced elongation effect, depending on the material parameters, may occur in two forms. One scenario manifests itself as tapering of the polar zones of the former sphere, where ‘beaks’ are formed, so that the shape of the object drastically deviates from a spheroidal one. The mechanism the underlies the occurrence of beaks is the surface instability of a magnetizable elastic continuum, and the beak nucleation follows the second-order transition pattern; the resulting overall elongation of the body does not display any hysteresis. Another scenario—it is related to MAEs with higher magnetic properties and softer matrices—implies that the beak formation happens simultaneously with a jump-like overall elongation of the former sphere, and this transformation resembles the first-order transition pattern. Upon assessing the chances to observe the predicted effects on the samples of now existing MAEs, one comes to a conclusion that the second scenario is hardly possible, whereas the first one, i.e., beak formation without hysteretic stretching, is much more realizable.
Application of Electroimpedance Spirometry for Clinical Assessment of Respiratory Function Indices
Authors: Zuev A L , Shakirov N N , Sudakov A I , Ju Mishlanov V 
Published: June 2021

Abstract
A practical method of studying the dynamics of respiratory function associated with the registration of the electrical impedance of conductive biological fluids exhaled by the patient is described. In the model measuring cell, the physical causes and relationships in the conductivity of the air flow, saturated with an electrolytic fluid aerosol created by an ultrasonic nebulizer have been investigated experimentally. The design of a new electrical impedance spirometer in the form of a mouthpiece with electrical sensors, filled with a porous medium impregnated with electrolyte, through which the patient breathes, is developed and tested. To register fluctuations in the magnitude of the impedance modulus, an original hardware and software complex is used, made on the basis of a high-speed analog-to-digital converter. Based on electrical impedance analysis data, the methods are proposed for quantitative assessment of the basic spirometric medical indicators characterizing the state and functioning of the patient’s breathing apparatus, such as respiration rate, entry and expiration rate, exhaled air volume, amount and concentration of exhaled lung fluid.
Impact the parameters of metal-inducer system on its electromagnetic measurands
Authors: Okatev R. , Kolesnichenko I. 
Published: June 2021

Abstract
In this work, we propose the finite-element-based mathematical model of the metal-inducer system. This system consists of a coil with put-on C-shaped ferromagnets. We study how the measurands of the inducer, such as the coil voltage and the uncompensated force acting on metal, depend on the system parameters. We variate the geometry of the system to estimate the boundary effect impact. Also, we study how the coil voltage depends on the ferromagnets’ spacing and their number. The inhomogeneity of electric conductivity is modeled via holes in the metal volume. To estimate their impact, we defined the dependences of the measurands on the number and the size of inhomogeneities.
Production of TiC – Co and TiC – NiCr Composite Powders and Study of Their Interaction with a Target under Cold Spray Conditions
Authors: Kosarev V F , Klinkov S V , Chesnokov A E , Smirnov A V , Shikalov V S 
Published: June 2021

Abstract
In the first part of the paper, the effect of mechanical treatment of particles of reacting Ti + C + Me (Me = NiCr or Co) mixtures on the process of self-propagating high-temperature synthesis (SHS) is investigated. It is shown that as a result of SH-synthesis in the free burning mode, a metal-ceramic sinter of high porosity is formed, which is easily destroyed by mechanical action. An increase in the volume fraction of the metal binder (NiCr or Co) leads to a redistribution of the sizes of carbides towards smaller values.
In the second part of the paper, the results of cold spraying nickel-chromium alloy particles and cermet particles of the TiC – NiCr composition on an aluminum substrate are presented. Produced NiCr coatings have a high porosity (up to 10 %) and a layered structure with clearly defined contours of individual deformed particles (splats). Due to the high hardness and low plasticity of metal – ceramic particles of the TiC – NiCr composition, during their interaction with the surface of aluminum substrate, continuous coating cannot be produced, only individual adhered particles are observed. With prolonged exposure to the flow of such particles, erosion of the substrate takes place.
A Study of Music Data Influence Under Machine Learning and Directed Network
Authors: Wang Chen , Li Mingyu , Cai Yuhuan 
Published: June 2021

Abstract
As we all know, the twentieth century has undergone earth-shaking changes, whether it is historical background, philosophical and aesthetic thoughts, political situation, military atmosphere, science and technology, etc. This situation also provides a good development environment for music. Based on this background, we study the relevant music data since the 20th century; build relevant models to understand and measure the influence, evolution and development of music. In order to build a bridge between music data, the musicians are classified as followers and influencers and the relationship between them is explored, and then the data is established by directed network link. Considering the irreversibility and difference of the influence between followers and influencers, this paper, on the basis of the traditional directed network link, fully considers the structural characteristics of the directed network, establishes a linear programming model, constructs a similar matrix by solving the optimal solution of the contribution matrix, and constructs a directed network linear programming index; Finally, the influence between follower and influence is reflected by the size of contribution value.
An Improved JITL Method for Soft Sensing of Multimodal Industrial Processes for Search Efficiency
Authors: Chen Yushan , Lin Yuan , Zheng Tianyu 
Published: June 2021

Abstract
In the industrial process, due to product change, working condition switch, or controller adjustment, process data often presents multimodal characteristics. Data-driven approaches are often based on single-modal assumptions, which may fail to describe process characteristics. The traditional just-in-time learning (JITL) method can continuously update the model to describe the multimodal data, but it takes much time and cannot meet the real-time requirements. In this paper, an improved JITL method is proposed to find similar samples quickly. The new samples are divided into the main category first, and then find the similar samples to improve the search efficiency. The effectiveness of the method is proved by a case of an industrial soft sensor case combined with partial least squares (PLS). Compared with the basic JITL, the root mean square error (RMSE) of the proposed method is reduced by 0.09, and the running speed is increased by 8.8 times.
An Image Recognition Algorithm Based on Big Data Technology
Authors: Ran Yijiang , Feng Zejing 
Published: June 2021

Abstract
In order to solve the problem of poor accuracy in small target recognition, a target detection algorithm guided by double attention model is proposed. Based on the implementation principle of the single-stage detection algorithm, this method introduces two attention models to improve the detection performance, especially for small target objects. Firstly, a multi-scale feature cascade attention module is introduced into the convolution neural network to pay attention to different regions in the feature map of the original convolution neural network, so as to reduce the background of the feature graph and the interference of negative sample information. especially in the shallow feature map, we can pay attention to small target objects effectively. In addition, the dense connection alleviates the problem of gradient disappearance in the process of network back propagation. Secondly, the significant channel self-attention module is introduced into the fused features to distinguish the different channels of the feature map and screen out the useful channel information to make the features to be detected more representative. The proposed method is tested on the target detection benchmark data set COCO to verify the effectiveness and advanced nature of the proposed method.
Surface hardening of steel 20H13 for friction pair with carbon plastic by ion-plasma Ti-Al-N, Ti-Al-Ni-N coatings deposition
Authors: Belov D S , Blinkov I V , Anisimov A V , Chernogor A V , Lishevich I V , Sobolev M Yu , Shibakov I A 
Published: June 2021

Abstract
The paper presents the results of comparative studies of Ti-Al-N and Ti-Al-N-Ni coatings deposited on 20H13 (DIN 1.4021) steel, used as bearings in shipbuilding and working in a friction pair with UGET (carbon epoxy fabric) carbon plastic. It was found that the addition of nickel into the coatings composition significantly improves the corrosion resistance of the coatings in sea water. The study of tribological characteristics indicates an increased wear of steel and Ti-Al-N coating, determined by the corrosion destruction of the samples, which accompanies the process of friction
Thermodynamic modeling of Ni-Cr-B-C-Si system in “air+propane” atmosphere
Authors: Ilinykh N I , Krivorogova A S , Gelchinsky B R , Ilinykh S A , Leontiev L I 
Published: June 2021

Abstract
In this paper, thermodynamic modeling of a powder self-fluxing material PGSR-2 based on nickel (wt. %): Ni-79.3, C-0.5, Cr-15, Si-3.2, B–2 was carried out. The simulation was performed in the temperature range of 300-6000 K in the atmosphere of “92 vol. % air + 8 vol. % propane” at a total pressure of P = 105 Pa. The temperature dependences of the equilibrium composition of the condensed and gas phases formed during heating are calculated.
In vitro study of the antibacterial properties of amorphous copper-doped carbon coatings
Authors: Sergeev G K , Sergeev K S , Samikova V N , Altfaumi S , Rubshtein A P , Vladimirov A B 
Published: June 2021

Abstract
A deposition technology of amorphous carbon coating (a-C), doped with copper (C-$$$Cu), has been developed. The C-Cu coating deposition was performed with the simultaneous operation of arc- and pulse-arc sources with copper and graphite cathodes, respectively. There was studied the antibacterial activity of the a-C and C-Cu against E. coli, S. aureus and P. aeruginosa. The copper-doped coating has bactericidal activity against P. aeruginosa. The number of bacterial colonies is five times lower in compare with a-C and Ti.
Implementation Effect of Targeted Poverty Alleviation in City D Measured by the Satisfaction Degrees of Poverty-stricken Households
Authors: Xiaoyan Du , Fumin Zhang 
Published: June 2021

Abstract
This paper quantifies the implementation effect of targeted poverty alleviation in city D based on survey data using analytic hierarchy process (AHP) and fuzzy comprehensive evaluation (FCE). On the basis of defining the concepts of poverty, targeted poverty alleviation, and implementation effect, it introduces four criterion layers (satisfaction degree with targeted identification, satisfaction degree with targeted assistance, satisfaction degree with targeted poverty relief, and satisfaction degree with management of special fiscal funds for poverty alleviation), and adopts pairwise matrices to perform consistency check, thus analyzing the implementation effect of targeted poverty alleviation and the satisfaction degrees of poverty-stricken households in city D. In the end, it proposes targeted measures and suggestions.
Research on the Application of Big Data Technology in Network Security Analysis
Authors: Ning Yingying 
Published: June 2021

Abstract
China’s information technology development and scientific and technological undertakings have entered a period of rapid development, and big data technology, as an important technical support and management tool, plays an increasingly prominent role in ensuring network security analysis. Faced with various deficiencies in network security analysis and data management at this stage, we must optimize network security analysis by applying network security data analysis platforms and big data core technologies. In particular, the multi-functional file management and technical integration in the data analysis process are conducive to the continuous improvement of file management, statistical efficiency and platform quality. Through scientific distribution and optimization of structure distribution, the efficiency of data and information storage management can be improved, and network security prevention capabilities can be improved to a large extent. This article first briefly explains the importance and necessity of big data technology, and analyzes the status quo of the problems in the process of data collection and analysis. The author further proposed the strategy of optimizing big data technology and promoting file management management to effectively guarantee the development quality and economic benefits of online statistical data and offline analysis technology.
Analysis on the Development of Potential Disciplines in Universities Based on Incites and ESI---Taking University of Jinan as an example
Authors: Tianmei Guo , Hua Shao , Xuehong Zhao , Chuanli Du 
Published: June 2021

Abstract
We provide objective data support for the discipline planning and discipline construction of University of Jinan, and speed up the entry of potential disciplines into advantageous disciplines, increase the influence of disciplines, and improve the quality of higher education. The threshold value relative gap method is used to calculate the potential value of potential disciplines, and the most potential disciplines of biology and biochemistry are selected. We analyze the trends of biology and biochemistry from the output of papers and the total citation frequency of papers, the distribution of cooperative institutions, and the situation of publishing journals. The total number of scientific research papers in biology and biochemistry is insufficient, and the total citation frequency of these papers has dropped significantly. There are fewer international and domestic cooperation agencies and the coverage of journals is narrow.
Whether Executive Incentives Restrain Corporate Violations: An Empirical Study Based on the Statistical Data of Listed Companies
Authors: Dong Li , Liu Quanhong 
Published: June 2021

AbstractCorporate violation of listed company has always been one of the researches focuses in the field of corporate governance, and executive incentives are considered to be an effective way to solve the principal-agent problem. This paper uses 454 companies that were publicized in the A-share market due to corporate violation in 2013-2017 as the research objects to explore the impact of salary incentives and equity incentives on listed companies’ violations, and explore the adjustment of the above-mentioned influence mechanism by the gender and age of executives’ effect. The study found that the compensation and equity incentives provided by shareholders of listed companies to executives can effectively suppress the violations of listed companies. Female executives can strengthen the inhibitory effect more than men, and the older the executives, the more the inhibitory effect can be strengthened.