bluuebunny/crossref_metadata_2025_split huggingface dataset:
Hyper-spectral Imaging Technology Based on Linear Gradient Bandpass Filter for Electricity Power Equipment Status Monitoring Application
Authors: Cheng Li , Ziwen Shang , Minzhen Wang , Li Liu , Guangxin Zhang , Jian Zhang , Liyin Zhao , Xiao Zhang , Hongxia Ni , Dongliang Qiao 
Published: September 2021

Abstract
Hyperspectral imaging technology has been applied to the status monitoring of power transmission line and equipment as its continuous and narrow-band induction characteristics, which provides a solution for the operation monitoring of lossless large-area power equipment. However, the optical and electronic equipment is complex, and the related products are large and expensive on the market. This paper describes a preparation method of a linear gradient filter that is cost performance and miniaturization, which can be used to realize the prototype hyper-spectral imaging camera. The high precision preparation process and principle make the camera show good spectral performance, which can scan with precision step length of 2nm between 400nm and 1000nm. The feature extraction and classification algorithm can be used to determine the health conditions of power equipment, such as partial discharge, with an accuracy of about 77%. The equipment collocation algorithm can also be used to identify defects in power equipment, which has been proved to be able to distinguish between aging insulators, icing of conductors and heating of wire clips. This method are promising for an entry-level, low-cost hyper-spectral imaging solution for power detection applications.
Interlayer ferromagnetic coupling and enhanced magnetism by biaxial strain in MnBi2Te4/VBi2Te4 heterojunction
Authors: Wu Zebin , Song Changsheng , Li Chaorong 
Published: September 2021

Abstract
The pristine anti-ferromagnetic interlayer coupling of even layers MnBi2Te4 greatly restricts the possibility of realizing quantum anomalous Hall (QAH) effect. In this work, based on first-principles calculations, we find that the interlayer coupling can be transformed into ferromagnetic order from anti-ferromagnetic by substituting cations with V atoms. Furthermore, when applying biaxial strain, a strong band inversion occurs around Fermi level, achieving quantum anomalous Hall effect. A gapless surface states can further confirm it. Meanwhile, the magnetic moment of Mn and V atoms increases with the increase of strain. We attribute this to the electron hopping to magnetic atoms from p orbitals of nonmagnetic Bi and Te atoms. Our work extends the range for designing and applying for spintronic devices with QAH effect.
Effects of different solvents on ultraviolet absorption and fluorescence intensity of 2,4-dichlorophenol, 2,4,6-trichlorophenol and Pentachlorophenol
Authors: Lan Wenbo , Li Qianru , Wang Xiaofeng , He Liping , Meng Yanbin , Wang Yashi , Li Jianhuang , Zeng Can , Wang Liying , Luo Mengfen , Bu Zhijian 
Published: September 2021

Abstract
In order to study the influence of the UV-visible absorption spectra and fluorescence spectrum from 2,4-dichlorophenol (2,4-dcp), 2,4,6-trichlorophenol (2,4,6-tcp) and pentachlorophenol (ptcp) in different solvents. Using methanol, tetrahydrofuran (THF), ethanol, dimethyl sulfoxide (DMSO) and acetone solvent models, computer simulation prediction and analysis of the three chlorophenols were carried out. It provides a reference for the choice of solvents in the determination of chlorophenols by the Ultraviolet-Vis absorption spectrophotometry and fluorescence intensity detection.
Motion of a self-propelled rod with Brownian and hydrodynamics interactions
Authors: Hu Nannan , Ma Fu , Wang Yaohong 
Published: September 2021

Abstract
The dynamic behaviour of a self-propelled rod in a three-dimensional system with cut-and-shifted Lennard-Jones interaction is studied by stochastic Eulerian Lagrangian method which coupled the coarse-grained microstructure degrees of freedom to continuum stochastic field, and the relaxation and thermal fluctuation of the fluid dynamics mode are taken into account. The diffusion of the self-propelled rod is found to have four regimes. The distributions of the horizontal displacements tend to bimodal non-Gaussian at long time when the self-propelled forces are introduced. Furthermore, we study the distributions of the rod velocities in parallel and perpendicular to the rod axis in the body frame. They are all Gaussian, and their standard deviations increase when the self-propelled forces increase.
Data-driven Modeling of Chinese Gong Based on Sparse Identification of Nonlinear Dynamics
Authors: Zhang Qinghong 
Published: September 2021

Abstract
Gong is widely employed in Chinese folk bands, but its sound mechanism and mathematical model is still not fully resolved. This work employs MEMS gyroscope to collect the vibration angular rate of two types of Hand Gong including median pitch and high pitch Gongs. This paper further employs Sparse Nonlinear Dynamics Identification (SINDy) [1] to identify a reduced order model of Gong. The model is using angular velocity as state variable and candidate library of nonlinearity is chosen up to fifth-order polynomial. The results indicate that the nonlinearity is prominent up to the third order (cubic) and the cubic nonlinearity is not appearing for the rotation around the axis perpendicular to Gong surface. These results confirm previous observations that the oscillator with a cubic nonlinearity is able to well characterize the nonlinear vibration behavior of Gong [2]. One potential application of this work is on musical psychology.
Research on Heat Dissipation and Insulation Measures of a Prestressed Continuous Box Girder Bridge Section
Authors: Wang Runjian 
Published: September 2021

Abstract
Taking a prestressed concrete box girder as the research object, aiming at the problem that the concrete bridge durability is reduced due to the appearance of temperature cracks in the concrete box girder, this paper adopted different types of heat insulation materials, and theoretically analyzed the structural temperature field of concrete box girder under high temperature difference and low temperature environment from the aspects of whether the heat source was set inside the concrete box girder, which provides a reference for the technical application and promotion of thermal insulation materials in concrete bridges.
Flexible Application of Static Balance Principle in Beam Internal Force Diagram
Authors: Ting Kang , Yingsheng Bai , Erlei Bai , Huixiang Sun , Tao Ge 
Published: September 2021

Abstract
When using the conventional segmental superposition method to make the bending moment diagram, it is not only complicated to calculate, but also easy to make mistakes. In this paper, it is discussed how to flexibly segment and simplify the calculation with examples. At the same time, according to the differential relationship, integral relationship and static equilibrium conditions between load and shear force, the fast and accurate pithy formula for shear force diagram making is concluded. The deep application of integral relationship between load and shear force is also discussed.
General Calculation Method of Normal Stress on Cross Section of Combined Tension (Compression) Bending Deformation
Authors: Wu Mengmeng , Yang Shaohong , Deng Hui 
Published: September 2021

Abstract
Tension (compression) bending combined deformation is a commonly used combined deformation form in engineering. The current material mechanics textbooks use the superposition method to calculate the stress on the cross section of the combined deformed member, whose characteristics are simple and easy to grasp. However, the premise of superposition principle is that the internal force, stress, strain and displacement have a linear relationship with external force. If the above linear relationship cannot be guaranteed, the superposition principle cannot be applied. In this case, the stress-strain relationship must be used for calculation. Based on the assumption of plane and unidirectional force, in this paper, rods with arbitrary cross-sectional shape under arbitrary load were taken as the research object, and the general calculation methods of the stress on the cross-section during the combined deformation of tension and bending were studied. This paper aimed at expanding students’ thinking mode and improving students’ learning ability in the process of material mechanics teaching.
Recent advances in active and passive microfluidic sorters
Authors: Wang Haoran 
Published: September 2021

Abstract
Due to the fast development in biology and chemistry, scientists find that it is important to get a suitable sorter since it can enhance the accuracy and speed of the cell sorting application. For instance, researchers in the biological field need precise sorters to help them separate different kinds of components. The need for micro-fluidic based sorting, a useful technique in medicine or biology, has promoted the development of microscale sorters. This paper reviews two types of sorters, including active and passive sorters. The principles, mechanisms, merits and demerits, avenues for improvement, and application in the future of those two sorters are summarized. In conclusion, this paper could be a useful reference for those who would like to know the microfluidic sorter’s overall knowledge.
Effect of low velocity impact on residual compressive strength of stiffened panel with welding residual stress
Authors: Liu Hui , Lei Zhenkun , Guo Zhenfei , Jiang Hao , Bai Ruixiang 
Published: September 2021

Abstract
Al-Li alloy stiffened panel is the main structural form of aircraft fuselage. Laser welding will produce welding deformation and residual stress, on the other hand, low velocity impact will also affect the residual bearing capacity of stiffened panel structure. In this study, the nonlinear finite element (FE) method is used to simulate the laser welding process of stiffened panel, and the welding residual stress is directly introduced into the subsequent impact after compression (CAI) process of stiffened panel. The effects of different impact positions and different impact energy on the residual CAI strength of stiffened panel are studied. The results show that the impact damage has the greatest effect on the residual compressive strength of stiffened panel when the punch impacts the stiffener, and the greater the impact energy is, the greater the influence is.
A Real-time Dynamic Deflection Measurement Method using Dual Camera for Lifting Device Dynamic and Static Load Test
Authors: Tang Xiaojun , Han Jingzhen , Yu Juan , Li Haixia 
Published: September 2021

Abstract
In the process of deflection measurement for lifting device dynamic and static load test (DSLT), the traditional measurement method has some obvious problems, such as complex test process, slow measurement speed, poor accuracy, low efficiency, and difficult dynamic measurement. Therefore, a real-time binocular vision method for measuring deflection in the lifting device DSLT is proposed. The results of verification show that the method can realize the real-time and fast deflection measurement in the lifting device DSLT, and has the advantages of non-contact, high precision and dynamic measurement. Compared with the traditional methods, the method proposed in this paper is simple, universal and easy to implement.
Study on the Influence of Isolated Roughness on Hypersonic Flow over Blunt Wedge
Authors: Tang Xiaojun , Han Jingzhen , Shi Mingfang , Yu Juan 
Published: September 2021

Abstract
To investigate the problem of the influence of the depth of the isolated D-type roughness element on the hypersonic flow around the blunt wedge boundary, the high-order accuracy finite difference method is used to carry out the direct numerical simulation, the influence of the depth of the isolated D-type roughness element on the interaction between the free flow and the wall is analysed, and the influence of the D-type roughness element on the wall pressure, the wall friction resistance and the wall heat flow is discussed. The results show that the strength of compression wave and expansion wave increases with the increase of the depth of D-type roughness element, but the position of compression wave and expansion wave does not change; With the increase of the depth of the D-type element, the change speed of the flow parameters will be accelerated, the peak value will increase and the trough value will decrease, and the position of the peak and trough will gradually move away from the center of the element with the increase of the depth of the element. When the depth of the D-type element is greater than or equal to 0.08, a vortex will form in the D-type element, and the length of the vortex increases with the deepening of the element. The D-type element will not change the flow state of the shear layer near it.
Modified engineering method for ultimate load prediction of composite hat-stiffened panels
Authors: Huang Xiaodi , Bai Ruixiang , Liu Wenhao , Wang Tao 
Published: September 2021

Abstract
In this paper, the ultimate load of a typical hat type composite stiffened panel under axial compression is simulated by finite element method. Based on the ultimate load value and failure mode obtained by numerical simulation, the thickness of the lower flange of the stiffener in the engineering method is modified by using the stiffness equivalent method. The modified engineering method is in good agreement with the finite element results, which has a certain reference significance for the rapid calculation and analysis of stiffened plate in the early design stage.
Study on Calculation Method of Anti Overturning of Continuous Steel Box Girder
Authors: Qi Zhongyang , Huang Fang , Su Xingju , Wang Shuang 
Published: September 2021

Abstract
The self weight of steel box girder is light, and the stability effect is smaller than that of concrete bridge. In this paper, the anti overturning research of the main line bridge and ramp bridge is carried out. It is found that for the variable cross-section continuous beam bridge with wind barrier along the whole line, when the pressure reserve of the side pier is small under the action of self weight, the compression of the bearing under the action of basic combination can not ensure that the bearing will not be empty under the action of standard value combination; Centrifugal force, wind load and temperature load caused by vehicle load have great influence on bridge overturning, which can not be ignored; Temperature load and foundation displacement may lead to stability or instability according to the stiffness distribution of the main beam. In this paper, it is proposed that both the basic combination and the standard value combination should be considered when checking the bearing void. It is recommended to adopt the calculation method of “the stability effect is the standard value effect that makes the superstructure stable, and the instability effect is the standard value effect that makes the superstructure unstable” as the stability coefficient.
The Profile of A Thin Piece of Paper with Both Ends Fixed
Authors: Chen Xuyang 
Published: September 2021

Abstract
In this manuscript, utilizing the controlled variable method, the three different profiles of thin paper with fixed ends are investigated. The results indicate that the specific profile of the paper depends on the length of the paper and the fixed distance between the sheets. Meanwhile, the mass of the paper has little effect on its profiles and so it can be ignored. Also, the symmetry-broken phenomenon about the thin paper is observed. Finally, according to the Principle of Least Action, it proposes a simple model to simulate the thin paper profiles
The Midpoint Upwind Scheme on the Bakhvalov-Shishkin Mesh for Parabolic Singularly Perturbed Problems
Authors: Zheng Quan , Wang Yi-Yang 
Published: September 2021

Abstract
In this paper, the parabolic singularly perturbed convection-diffusion problem is discretized by using the backward Euler method in time and the midpoint upwind scheme on the Bakhvalov-Shishkin mesh in space. This method is shown to be first-order convergent in time and space. Finally numerical experiments confirm the theoretical results.
Dynamic numerical simulation analysis of a large caliber artillery projectile extrusion process
Authors: Zhang Xin , Wang Baobao , Zhang Hui , Yu Cungui 
Published: September 2021

Abstract
Taking a large-caliber gun as the research object, a projectile and gun coupling finite element numerical simulation model during the extrusion process is established according to the finite element simulation technology. The dynamic simulation of the extrusion process is carried out by using ABAQUS/EXPLAICT solver, and the stress variation law of the projectile belt during the groove and the barrel during the extrusion process is obtained. In the post-processing module of the finite element software, the data of displacement, velocity and acceleration at the center of mass of the projectile in the extrusion process are extracted, and the motion law of the projectile in the extrusion process is analyzed, which provides some reference value for the study of the extrusion process of large caliber artillery projectile.
Positive definite matrix and its proof method
Authors: Jiang Yinshan 
Published: September 2021

Abstract
Advanced algebra is a required course of undergraduate mathematics, which plays a fundamental role in completing the study of other professional courses for students. Matrix theory is an important branch of mathematics, it is not only a basic subject, but also themost practical value. Widely used in mathematical theory, matrix is an important basic concept in matrix theory, is a major study of algebra, Positive definite matrix is a kind of important matrix, occupies an important position in “higher algebra”, its theory has rich content, positive definite quadratic form and Euclidean space, physics, probability and optimization control theory are related to it.
The Fourier Transform and its application in solving the equation
Authors: Guan Hanwen , Song Haoyi , Yang Yukun , Zhang Jiayuan 
Published: September 2021

Abstract
Fourier transform is a linear transform that applicants in the field of engineering and physics. In this research study, we summarize the fundamental properties of the Fourier transform and its application in solving the wave equation. First, we review the definition of Fourier transform and its inverse form. Then, we show Schwartz space is the invariant subspace of the Fourier transform. We also prove the Plancherel theorem. At last, we apply the Fourier transform to solve the wave equation.
Three methods for solving systems of linear equations: Comparing the advantages and disadvantages
Authors: Luo Haoyu , Wu Simeng , Xie Ningyun 
Published: September 2021

Abstract
This paper aims to introduce some prevalent techniques which have been used to solve linear systems. Firstly, we introduce the simplest method: how to eliminate variables in which the original systems would not be changed. We then introduce Gaussian eliminations, which work on the augmented matrix derived from a linear system. To the end, we present Cramer’s rule, which computes the solution to a linear system based on matrix determinants. These methods have their application scenarios. For instance, eliminating variables has no limited condition for its operations. However, Cramer’s rule needs to be under the condition of square matrices. At the same time, Gaussian elimination requires three elementary row operations, and Gaussian elimination paves the way for computing the rank of matrices. The choice between these methods depends on coefficient matrices in terms of dimensions and matrix properties such as singularity.
RESEARCH ON COVID-19 EPIDEMIC BASED ON ARIMA MODEL
Authors: Zhihao Li , Junpei Wang , Xiaoliang Zhang , Huijun Ning 
Published: September 2021

Abstract
Since the outbreak of the novel coronavirus, the epidemic has received extensive attention all over the world. In this article, an evaluation system was established to analyze the epidemic prevention and control situation of some countries. And the ARIMA model was built to predict the epidemic situation in a short period of time. Then taking the United States as an example, the predicted values of the number of newly diagnosed cases, death rate, and cure rate in 10 days were obtained, which were then compared with the actual data. It is shown from the results that the ARIMA model can be used to predict the epidemic and provide a decision-making basis for the current world’s epidemic prevention and control.
Soliton solutions of a generalized Gross-Pitaevskii equation via Darboux transform
Authors: Liu Shuli , Wang Dan , Geng Yong , Wang Xiaoli 
Published: September 2021

Abstract
The nonlinear Schrödinger equation (NLS) is widely used in different branches of physics. The GP equation is a kind of NLS equation with potential function term. In this paper, the soliton solutions of a generalized GP equation are explored. Firstly, we construct the Lax pair and Darboux transform(DT) of the equation. Then, we solve the single and double soliton solutions of the equation. Lastly, we draw the images of the single and double soliton solutions, and investigate the properties of the solitons. It is found that the amplitude of a single solitary wave does not change, and the shape and amplitude of the double solitary wave remain unchanged after the collision.
Form-finding Design of Cable Network Antenna with Truss System by Force Density Method
Authors: Wang Lipeng , Xiao Yong , Yang Jungang , Fu Kangjia 
Published: September 2021

Abstract
In recent years, the design and development of space-borne large-scale deployable antennas represented by ring truss deployable mesh antennas has attracted the attention of scholars in the aerospace industry from all over the world. Force density is the most widely used form finding algorithm for mesh antennas. The force density method assumes that the truss nodes of the antenna are rigidly connected, In this paper, an integral form finding algorithm for cable truss antenna is proposed, and the difference between the two algorithms is compared.
An operator splitting method for solving dimensionless radiation hydrodynamics equations
Authors: Yan Kai , Fu Meiyan , Han Feng , Yao Chengbao , Lei Yu 
Published: September 2021

Abstract
By non-dimensionalizing the radiation hydrodynamics equations in the form of Boltzmann-Euler coupling, the two moments approximate model written with non-dimensional variables is proposed and the non-dimensionalization leads to two parameters. An operator splitting method is developed to solve the dimensionless radiation hydrodynamics equations. The advantage of this method is that instead of solving nonlinear equations, it solves a set of ordinary differential equations, and these ordinary differential equations are decoupled. Lastly, the paper describes the Su-Olson problem which has a semi-analytic solution. The analysis shows that the solutions of numerical simulation agree well with the semi-analytic solutions in equilibrium diffusion limit.