bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on Safety Evaluation and System Development of Tunnel Lining Based on Set Pair Analysis
Authors: Shi Fulin , Cai Shuang 
Published: April 2023

Abstract
Considering the importance of lining thickness in lining safety, and realizing the synchronization of safety evaluation and information development, this paper combines the methods of literature research and field investigation, focuses on six influencing factors, such as the deterioration of lining materials, the deformation of lining and the lack of tunnel clearance, et al. An evaluation index system of structural safety classification is established, and then substantiates each index and defines its quantitative or qualitative evaluation criteria. Through the normalization processing, the state of the evaluation index can be characterized by the normalized value. Analysing the characteristics, structure, relationship, trend and the mode of their mutual connection between the indexes by set pair analysis method, the calculation formula of the connection degree is obtained, and then the set pair potential vector is obtained. According to the principle of maximum set pair potential, the safety evaluation of lining structure is divided into five levels: safe, safer, less safe, unsafe and extremely unsafe. With the help of App Designer tool in MATLAB software, a program suitable for lining safety evaluation is designed and developed independently. Combined with a tunnel project in Chongqing, the above method is used to judge the lining safety of the tunnel project in order to provide a quick way for tunnel safety evaluation.
Numerical Simulations of Air Shock Wave Overpressure Propagation in Shallow-buried Explosion
Authors: Yang Feng , Xu Lixin , Zhai Hongbo , Su Jianjun 
Published: April 2023

Abstract
Shallow-buried explosion is a typical working condition of ammunition. Studying the overpressure propagation law of air shock wave in shallow-buried explosion is helpful to completely characterize the ammunition power in actual combat. In this paper, a numerical model of shallow-buried explosion of cylindrical charge based on Euler method is established in the framework of simulation software AUTODYN, which simulates the formation process of crater when cylindrical charge is initiated under the conditions of different charge amount and different buried depth, and analyzes the propagation law of explosion shock wave in the air. The following conclusions are drawn: compared with the mass of charge, the depth of burial has more influence on the surface air shock wave. According to the simulation data, the empirical formulas related to the peak overpressure of shock wave and the charge, buried depth and horizontal detonation center distance are fitted.
Study of Terahertz Sensing Performance Based on Graphene-DBR Asymmetric Structure
Authors: Lan Huiting , Yu Zhisheng , Zheng Zesong , Feng Shiping , Su Hong 
Published: April 2023

Abstract
Tamm plasmon polaritons have super strong field localization, and can be directly excited by TM or TE polarized light without dispersive devices, whose related technology has become one of the research hotspots nowadays. In view of this, in this paper, a terahertz sensor device based on double-dip detection of Tamm plasmon polaritons is designed. The device is asymmetric structure, which can excite two Tamm plasmon polaritons modes with the different intrinsic energies at the interface between two DBRs and graphene. Through the optimized simulation analysis of its terahertz sensing characteristics, the results show that the reflection spectrum under this structure has two dips at 0.9THz and 1.0THz respectively, and their full widths at half maxima of 0.0361THz and 0.0131THz are relatively narrow. Moreover, their sensitivities are 0.21THz/RIU and 0.41THz/RIU, and the figure of merit can reach up to 5.69RIU−1 and 31.33RIU−1, respectively. Therefore, this research is suitable for high sensitivity terahertz double-dip detection, and has important application prospect in terahertz devices.
Study on the Optimal Reaction Parameters of C4 Olefin Prepared by Ethanol Catalyzed Reaction Based on XGBoost Regression Prediction Algorithm
Authors: Kang Wenkai , An Yaohui , Zhang Linqing 
Published: April 2023

Abstract
The production of C4 olefin by ethanol coupling catalytic reaction has a broad development prospect in the field of renewable energy. In this paper, the influencing factors of C4 olefin preparation process were studied, the influence of temperature and catalyst type on the reaction was analyzed, and the multivariate nonlinear regression fitting model was established under the assumption of ignoring the small probability of experimental error. Then, based on the grey correlation analysis model, the correlation degree between each variable and ethanol conversion rate and C4 olefin selection rate was studied.
Then, using the catalyst parameter variables considered above, the relationship equations between four catalyst parameter variables, temperature and C4 olefin yield were calculated, and the overall constructor model of C4 olefin yield under the joint action of five variables was established by using the constructor method. Finally, using MPai data science platform software based on XGBoost regression prediction algorithm, the established constructor was cross-validated by 50% fold, and the optimal solution of reaction parameters was finally obtained.
Finally, five experiments were selected to improve the experimental control group data and verify the accuracy of the theoretical value of the optimal solution. By changing the catalyst parameters and temperature, a relative control group was added to the experimental group, and the conclusion of the theoretical parameter optimal solution under unrestricted and temperature restrictions was experimentally verified.
Nonlinear Optical Properties of Several π Conjugated Bridge Groups based on Diketo-Pyrrole-Pyrrole: Study on the Length and Symmetry of N-atom Position Substituted Alkyl Chains
Authors: Hong Lin , Zhou Bowen , Meng Xiangxu , Zhang Ding , Jiang Yihua , Liu Dajun , Wang Guiqiu , Hua Jianli , Wang Yaochuan 
Published: April 2023

Abstract
In this paper, three modified π-conjugated bridges, were selected to study the relationship between substituted alkyl chains and two photon absorption ability as well as intramolecular charge transfer property. The modification is on the N-atom position of Diketo-Pyrrole-Pyrrole bridges. Some nonlinear optical measurements as well as several spectra methods, were used. DPP-J0, DPP-J1 and DPP-J2 exhibit cross-section of 5.6 GM, 8.1 GM, and 6.4 GM. The results exhibit obvious relation on the length and symmetry of N-atom position substituted alkyl chains. A pump-probe measurement was operated at 800 nm. Ultrafast dynamics results exhibit slight difference on the intramolecular charge transfer of these conjugated bridge derivatives. The quantum chemical calculations results are well accorded with the nonlinear optical properties. The results obtained may provide some useful information on molecular design and optimization of new advanced materials.
Charge Evolution for N2
+ Ion Passing Through Ag Target
Authors: Wang Shixuan , Wang Guiqiu , Gao Xin , Yi He , Wang Jian , Li Yujiao 
Published: April 2023

Abstract
Charge state is a key factor for the ion stopping and energy deposition. It is helpful to understand the physics mechanics for interaction between ion and target by studying the charge state. In this paper, nitrogen molecular ion charge evolution in Ag target is studied. It is shown that the charge state of the trailing ion is oscillating, while the leading ion doesn’t show the similar behavior due to the wake effects aroused by the electronic exciting of the target electron.
Study on Modification and Application of Functional Polyurethane in Leather Finishing
Authors: Qin Ying , Liu Yan , Kuang Guankun , Zhou Yuanyuan , Xin Binjie 
Published: April 2023

AbstractOver last few years, polyurethane (PU) has been applied in many fields by virtue of its mechanical strength, wear resistance, toughness, low temperature flexibility and other characteristics recently. To be more precise, PU materials can be screened through raw materials, improved formulas and so on to obtain the corresponding “customized” products. This gives the product “customizability” and further broadens the use of functional PUs. PU is one of the important coating materials in leather manufacture. This paper explores the academic research status of functional PU and its modification and application in leather production and leather finishing.
Exploring Multiple Strategies towards Luminescent Fibers and Applications
Authors: Zhang Zhihao , Xin Binjie , Yang Xue , Gao Di , Yu Wenjie , Wang Yingwen , Jiang Yuchen , Hou Chao , Huang Peijun , Xun Wenjun 
Published: April 2023

Abstract
Since its invention, luminous fibers have received extensive attention from scientific researchers. Luminous fibers are mainly distinguished by their energy source and are divided into two types active and passive luminous. As an emerging fiber material, luminescent fibers have been used in the military, firefighting, marine transportation, fishing, and other fields; mainly covering the application of each luminescent fiber fabric, light display materials, luminescent fiber components, energy conversion components, intelligent textiles, anti-counterfeit labels, unique clothing, etc. This paper introduces the classification and luminescence principle of luminescent fibers around the research progress of luminescent fibers in recent years and outlines the relevant applications of luminescent fibers.
A Thermodynamically-based Modeling for the Creep and Plasticity of Al 5083 Alloy
Authors: Meng Li , Chen Wufan 
Published: April 2023

Abstract
To ensure a thermodynamic consistency for a constitutive model is a higher request for modeling the mechanical behaviors of materials. This paper conducts a thermodynamic analysis for a creep-plasticity model for Al 5083 alloy. The constitutive equations are derived from the fundamental thermodynamic laws, maintaining a rigorous physical basis of the proposed model. The monotonic tensile and creep tests are introduced for modeling, illustrating the rationality and accuracy of the proposed model.
Dynamics Simulation and Light-Sheet Tomography of Multispecies Ion Coulomb Crystals
Authors: Shen Yong , Zhang Hongshuo , Zhou Yongzhuang , Xie He , Cheng Hang , Zou Hongxin 
Published: April 2023

Abstract
Ions in coulomb crystals are sufficiently cooled and well isolated from the environment, which makes them an ideal platform for the research of high precision spectroscopy. Ion coulomb crystals (ICC) constituted by multispecies ions can provide important information about the nucleus, such as isotope shifts and hyperfine splittings. In order to extract the spectroscopic data with a high precision, the status of ICC needs to be properly evaluated. In this paper, we utilize the molecular dynamics simulation software LAMMPS and the (py) Lion package to simulate the dynamics of ICC with multispecies ions. To make a better comparison between the simulation results and experimental observations, we propose an ICC tomography scheme with the fluorescence light-sheet microscopy. This work can be applied to make better estimation on dynamic parameters of both laser cooled and sympathetically cooled ions.
Petrographic and technological aspects of improving the methodology for alternative determination of the degree of carbonification
Authors: Bezruchko Kostiantyn , Baranovskyi Volodymyr 
Published: April 2023

Abstract
The methodology for determining the earlier proposed indicator of the intensity of the shade of grey (Grey Intensity) as an alternative to the normative indicator of the reflectivity of vitrinite has been improved. The values of this indicator have been analyzed in the polished section specimen on the surfaces of the cut, layering, and tangential sections along the macerals of all three groups (vitrinite, liptinite, inertinite). The studies have been conducted in natural incident light as well as in the light passing through yellow, red, blue, and green filters. A large factual material has analyzed the petrographic and technological difficulties of measuring the Grey Intensity indicator. It is associated with the spatial arrangement of the observation planes of preparations relative to the natural occurrence of coal beds, the surface features of macerals, the influence of chemical (fluidization, gas generation) and tectonic (dynamic metamorphism) processes on the transformation of the gelled substance as the main object of research. Recommendations on the choice of a lens and a platform for measurements have been given, taking into consideration the optical system of incident light. The expediency of using color filters has been considered.
Application of detonation in impulse systems of energy engineering and mining industry
Authors: Vasiliv Stepan , Pryadko Nataliya , Strelnikov Hennadii , Dzuba Sergiy 
Published: April 2023

Abstract
Nowadays the demand for energy needs is constantly growing. Given the fact that most of this demand is provided by non-renewable energy sources, another way of development remains relevant is more efficient use of available resources. One of the areas of effective energy use is swapping deflagration combustion to the detonation process. Due to the rapidity of the detonation, the entropy of the reaction products is lower than that of deflagration combustion. In addition, there are only “fast” reactions, so the molar mass of the products is the minimum possible for a specific fuel mixture. The article considers a special case of the application of the detonation process in a new way of control the thrust vector of rocket engines, shows its effectiveness and features of use. Numerical modeling of the injection of detonation products into the supersonic part of nozzle at different angles was carried out, and the change in relative lateral force over time was determined for each case. It is shown that the control system with discrete control pulses can be used to maneuver the upper stage of the rocket and to destroy hard mineral rocks, to compact soils and materials in compressed conditions.
Assessment of radioactive contamination level of environment in case of accident at nuclear power plant
Authors: Biliaiev Mykola , Rusakova Tetiana , Dziuba Serhii , Lapshin Yevhen , Koval Natalia 
Published: April 2023

Abstract
The accidents at nuclear power plants pose a particular threat to the population and the environment. Accidental emissions at nuclear power plants can cause long-term radioactive pollution of the environment, and the elimination of such pollution can take years. For practice, it is very important to predict the intensity and size of radioactive contamination zones for various scenarios of extreme situations at the nuclear power plants. Such a forecast will identify the most vulnerable areas and develop a response strategy to the situation that has arisen. A numerical model has been built that allows to quickly predict the scale of radioactive contamination of the territory during an emergency release at a nuclear power plant. The model is based on the application of implicit difference schemes for the numerical integration of the equation of convective-diffusion transport of impurities in the atmosphere. The developed model is characterized by the calculation speed. The results of the computational experiment are presented.
Dynamic and mass-exchange parameters of scandium recovery by TVEX-TBP in column mode from the solution after salt chlorinator cake leaching
Authors: Korovin Vadym , Pohorielov Yurii , Shestak Yurii , Valiaiev Oleksandr 
Published: April 2023

Abstract
The paper deals with scandium extraction with Levextrel-type resin named TVEX contained tributyl phosphate (TVEX-TBP) in the column mode from the clarified solution formed after leaching salt chlorinator cake formed at Zaporozhye Titanium & Magnesium Combine Ltd. It was found that TVEX-TBP featured high extraction parameters. Total dynamic exchange capacity was defined. Mass-exchange parameters were calculated for scandium extraction in the column mode taking into account the impact of external diffusion kinetics: time to form the equation concentration front, front parallel transfer time, concentration and kinetic recovery factors, kinetic factor of external diffusion, linear speeds of the solution in the column and the equilibrium concentration front motion. The calculated mass-exchange parameters may be used to design the column cascade for scandium extraction from the clarified leaching solution of the salt chlorination cake in column mode. There are the following advantages of scandium extraction with TVEX-TBF in the column mode in comparison with its recovery in a reactor cascade: simpler hardware design and process control, the possibility to better wash TVEX from impurities, getting a strippant higher Sc concentration, reduced TVEX abrasion.
Prediction of atmospheric air pollution near a coal stack in adverse weather conditions
Authors: Biliaieva Viktoriia , Berlov Oleksandr , Kozachyna Vitalii , Nochvai Volodymyr , Yakubovska Zinaida , Olatoye Oladipo Mutiu 
Published: April 2023

Abstract
Coal piles on the territory of enterprises are long-term sources of dust pollution of atmospheric air. Forecasting the level of dust pollution of the air for such objects is carried out, as a rule, for convection conditions. But during inversion, very high concentrations of dust can occur on industrial sites. The task of assessing the level of dust pollution of atmospheric air at an industrial site during dust emission in conditions of inversion from a coal stack is considered. A three-dimensional equation of convective-diffusion dispersion of contamination in atmospheric air, compatible with the approach of Prof. Berliand M. on determining the value of the vertical diffusion coefficient in the surface layer of the atmosphere for the case of inversion, to model dispersion of dust from a coal stack under inversion conditions is used. Numerical integration of the modeling equation of convective-diffusion transport of contamination is carried out on the basis of the splitting method compatible with the use of a locally one-dimensional finite-difference scheme. The results of a computational experiment to determine dust pollution zones at the Prydniprovsk thermal power station are presented.
Numerical study of parameters of unit for supplying additional gas flow in jet mill ejector
Authors: Ihnatiev Oleksandr , Shevelova Hanna , Strelnykov Hennadii , Blyuss Borys 
Published: April 2023

Abstract
We have carried out numerical simulation of the flow in the jet mill ejector. The features of ejector are an annular unit for supplying an additional gas flow in the form of a confuser section at the inlet to the accelerating tube, as well as a confuser at the outlet of the accelerating tube. In the course of the study, we have varied the length of the confuser section at the inlet and the angle of an additional gas flow supply. We have established the optimal parameters of the unit for supplying an additional gas flow in the ejector, at which it has been the most uniform distribution of the flow velocity at the outlet of the accelerating tube. The use of the ejector scheme under study ensures the alignment of the vortex flow and a stable near-wall layer throughout the accelerating tube. The results of the study can be used to improve the efficiency of the grinding process in a jet mill.
Substantiating the operating parameters for an underground gas generator as a basic segment of the mining energy-chemical complex
Authors: Saik Pavlo , Falshtynskyi Volodymyr , Lozynskyi Vasyl , Dychkovskyi Roman , Berdnyk Mykhailo , Cabana Edgar 
Published: April 2023

AbstractThis paper presents the main aspects of changing the coal mining technology based on the introduction of underground coal gasification technology for the mining-geological conditions of the occurrence of State Enterprise “Lvivvuhillia” coal seams on the example of “Chervonohradska” mine. When conducting analytical studies using the “Material-heat balance of underground coal gasification” software, predictive quantitative-qualitative indicators of the injected blast mixture and gasification products have been determined depending on the structure and elemental composition of the coal seam, host rocks, water saturation of the seam, and water inflow into the gasification channel. The heat energy loss of an underground gas generator during the gasification of thin and ultra-thin coal seams has been revealed. The heat and energy capacity of the underground gas generator has been determined depending on the type of supply of the injected blast mixture to the combustion face “mirror” and the performance indicators of the gas generator segment within the mining energy-chemical complex taking into account the quantitative-qualitative indicators of generator gas and liquid chemical raw material of the condensate.
Water saturation of coal samples during long-term impregnation
Authors: Yelisieiev Volodymyr , Lutsenko Vasyl , Tepla Tetiana , Ruzova Tetiana , Harasek Michael 
Published: April 2023

Abstract
The paper investigates applicability of two mathematical models developed by the authors for calculating the process of long-term impregnation of coal samples. A distinctive feature of the studied samples is low porosity. Considered models are based on single- and three-channel representation of the internal structure of a porous medium. These models were previously used to study the process of long-term impregnation of highly porous materials. At the same time, the three-channel model in most cases showed much better agreement with experimental data. This study revealed some features of these models associated with approximation of the experimental data obtained for the low porous samples. These features consist in the presence of rather small (in some cases) errors in the processing of experimental points by means of single-channel model. At the same time, the refinements obtained by means of multi-channel model cause only slight error decrease. The results suggest that the channel distributions along the radial direction of the investigated coal samples are narrow and have a pronounced peaks close to the obtained average values.
Energy-force interactions in vibroimpact systems
Authors: Shevchenko Volodymyr , Shevchenko Heorhii 
Published: April 2023

Abstract
The energy-force interactions in vibroimpact systems are studied according to the developed universal mathematical model, which simulates multi-mass vibroimpact systems, the masses of which are connected to each other and to a fixed base by nonretaining one-sided and retaining two-sided elastic bonds, with the excitation of these systems by inertial debalanced vibrators driven by a limited power The results of the research indicate a higher efficiency of vibrations of vibroimpact systems in comparison with a non-vibroimpact system of similar parameters. The highest energy efficiency of oscillations of vibroimpact systems and, accordingly, their maximum efficiency takes place at the excitation parameters that precede the disruption of vibroimpact oscillations. At the same time, maximum accelerations and reactions in their elastic bonds are excited in the systems. Based on this, it is necessary to accept the maximum permissible acceleration of the elements of their constructions as criteria for choosing rational process parameters in viboimpact systems, which ensures the reliability and durability of their operation.