bluuebunny/crossref_metadata_2025_split huggingface dataset:
Risk Analysis and Scheme Optimization of Sand Control String Running in Extended Reach Horizontal Well
Authors: Ji Yuchen , Wen Min , Yue Jiaping , Zhang Binbin , Zi Yicheng , Yang Dongchuan 
Published: December 2022

Abstract
Due to the structure of the wells and other factors, the sand control string in offshore extended-reach wells is subjected to great friction resistance and even buckling phenomenon when being lowered, which ultimately leads to the failure of the string to be lowered in place. Based on elastoplastic and other relevant theories, this paper took an extended reach horizontal well in an oilfield in the South China Sea as an example and analyzed the friction and wellhead suspension weight of different well structures and completion string combinations in the process of running and finally carried out the risk analysis of the running string and the optimization of completion scheme. The results show that the friction resistance of the four-hole structure (8 1/2″) is lower than that of the five-hole structure (6″). Among them, an 8-1/2″ open hole 5-1/2″ high-quality screen is preferred, and a 6″ open hole 4″ high-quality screen is preferred. The friction coefficient in the open hole section is less helpful in improving the running safety of the sand control string, while reducing the friction coefficient in the casing is more obvious to reduce the friction. The results can provide guidance for the running of the screen and control string in the extended reach horizontal well.
Diagnosis and Treatment of Burst Vibration Fault of Large Steam Turbine Generator Shaft System
Authors: Xia Yalei , Xu Hui , Li Yong , Zhang Wentao , Zhang Xuyang , Wu Yajun 
Published: December 2022

Abstract
Aiming at the burst vibration fault of a supercritical 600 MW steam turbine generator unit during the on-load operation, the characteristics of sudden vibration faults of the rotor system were compared and analyzed. By analyzing the weight-loss vibration response coefficient and the variation characteristics of the vibration vector, parts falling off fault at the low-low coupling of the rotor system were diagnosed. After inspection, it was confirmed that the burst vibration fault of the rotor system was caused by the falling-off of the blast baffle of the low-low coupling bolt. After the blast baffle was restored by hoisting the installation technique, the vibration of the steam turbine generator unit was stable during start-up and grid connection.
Sintering Mechanical Properties of SiC/nano-Ag/Cu: Molecular Dynamics Simulation
Authors: Zhang Jiansheng , Zhang Peng , Ye Guigen 
Published: December 2022

Abstract
Nano-sintered silver has broad development prospects in the field of electronic packaging due to its excellent thermal conductivity and feasibility at low sintering temperatures. In this paper, by using molecular dynamics simulations, a single nano-silver particle is sintered, and its melting temperature range is obtained. Then, a SiC/nano-Ag/Cu sintered sample is prepared. By observing the formation process of the sintering neck, it is found that the sintering quality can be improved by prolonging the constant temperature time. Tensile simulations are performed on the sintered samples, and the traction-separation law curve is obtained. The initial yield strength of the sintered sample is 3.03 GPa, the elastic modulus is 28.99 GPa, and the fracture energy is 11.74 N/m according to the traction-separation law curve.
Effect of MHD Control on Turbulent Boundary Layer Separation Flow in Scramjet Inlet
Authors: Wu Zhaoyu , Ding Mingsong , Dong Weizhong , Gao Tiesuo , Jiang Tao 
Published: December 2022

Abstract
In order to study the effect of MHD control on the separation flow of turbulent boundary layer in the scramjet inlet based on the assumption of low magnetic Reynolds number, considering the source term of turbulent electromagnetic dissipation, the numerical simulation method is developed for electromagnetic field coupled with flow field. A Mach 4 plate is adopted as the basic configuration to assess the accuracy of the solver’s source term of turbulent electromagnetic dissipation. On this basis, numerical simulation of MHD control on the separation flow of boundary layer in scramjet inlet is carried out to study the influence of different electric field strengths and magnetic induction intensity on it. The results show that applying MHD local control alleviates the boundary layer separation in the scramjet inlet. Under different electric field strengths and magnetic induction intensity, the separation vortex’s scale significantly changes. The scale of the separation zone continues to decrease when the electric field strength or magnetic induction intensity increases, and the effect of MHD control is more significant.
High Quasi-static Pressure Measurement of Explosion in Closed Container
Authors: Xie Ye-ye , Duan Zhuo-ping , Bai Zhi-ling , Zhang Lian-sheng , Huang Feng-lei 
Published: December 2022

Abstract
To develop a method for determining the parameters of the final equation of state (EOS) of detonation products of aluminized explosives, an explosion quasi-static pressure measurement system in closed containers with a large mass-to-volume ratio is developed. The influence of domestic and foreign typical charge piezoelectric pressure sensors, sensor buffer adjustment structures, container tightness, grounding operation, weather, and other factors on the long-time measurement of high quasi-static pressure are comparatively studied. The test methods and conditions for obtaining standard quasi-static pressure-time curves are clarified. The influence of the mass of different aluminized explosives on the static pressure is obtained. The result shows that the foreign 113B03 type sensor is more suitable for measuring quasi-static pressure with a leakage effect in a humid environment. An appropriate sensor buffer adjustment structure and reliable grounding operation can significantly reduce the high-frequency oscillation of the signal.
Sodium Fast Reactor Steam Generator Heat Exchanger Modal Analysis and Additional Mass Coefficient Calculation
Authors: He Shan , Zhu Lina , Wu Shuijin 
Published: December 2022

Abstract
The heat transfer tube of the steam generator (SG) of the sodium fast reactor (SFR) isolates the primary sodium from the secondary side water, whose integrity is very important for the safe operation of the reactor. Modal analysis is the key to engineering design. Three design criteria of GB/T151, ASME, and TEMA are adopted for calculation. Based on ANSYS finite element simulation, modal analysis of heat transfer tubes and additional mass coefficient of the liquid sodium flow field is calculated, which is verified by experiments. The results show that GB/T151 is most suitable for calculating the frequency of heat transfer tubes of the SFR steam generator. The numerical model and analysis method established in this paper can accurately carry out modal analysis and additional mass coefficient calculation of non-equal span tube-plate multi-support heat transfer tubes in different media, which lays a foundation for flow-induced vibration analysis of SFR heat exchanger equipment.
The Anomalous Magnetic Moment of Muon
Authors: Li Gaoyuan 
Published: December 2022

Abstract
Known as one of the most hopeful fields to find new physics beyond the standard model, the anomalous magnetic moment of muon has gained much attention for a long time and become even more important after the Fermi National Accelerator Laboratory’s result came out in 2018. This paper shows the general works and achievements in this exciting field. Those include experiments operated by the Brookhaven National Laboratory and Fermi National Accelerator Laboratory to measure the g-2 factor, the calculation based on the standard model, and a possible extension of the standard model that can explain the experimental results. This paper is an introduction for anyone interested in this field.
Active Vibration Control of Nonlinear Elastic Wire Rope in Mine Hoisting System
Authors: Liu Ming , Luo Zhen , Sun Lin 
Published: December 2022

Abstract
Based on the importance of the safe operation of the mine hoist mechanism, an adaptive control method based on Fuzzy Sliding Mode Control (FSMC) was applied to synchronize the large-amplitude response of geometrically nonlinear elastic wire rope in mine hoist systems. To efficiently and precisely synchronize the lateral vibration of a wire rope under the adaptive synchronizing method, the control equation of the elastic wire rope was given considering the large von Karman geometrical deformation, and it was converted to a six-dimensional nonlinear dynamical system using third-order Galerkin discretization. Based on this dynamic system, the existing FSMC is improved, so that the improved control strategy will be available for the active dynamic control of multidimensional nonlinear dynamical systems. The research shows that the control strategy can effectively synchronize the large-amplitude response of wire rope, thus providing the basis for dynamic design, fault diagnosis, and safe operation of the mine hoist system.
Research on the Effect of Lateral Jet on the Flow Field and Aerodynamic Characteristics of Projectile with Grid Fins
Authors: Wang Xinchen , Liu Yuwei , Zhang Jiayue , Liu Yaofeng 
Published: December 2022

Abstract
In this paper, an effectively structured grid generation scheme is adopted to generate high-quality body-fitted structured grids for jet and grid fins. Based on this, the effects of lateral jets on the flow field and the aerodynamic characteristics of the projectile with grid fins at various angles of attack are studied. The outcomes show that the influence of the jet on the aerodynamic characteristics of the projectile with grid fins is mainly composed of the interference of the jet itself and the interference of the jet developing downstream on grid fins. The variation in the angle of attack will change the bow shock height of the jet and the low-pressure interference region, which will interfere with the grid fins, thus affecting the overall aerodynamic characteristics of the projectile.
The relationship between Fibonacci number and Riemann zeta-function in the sense of Ramanujan constant
Authors: Yin Huangcheng 
Published: December 2022

Abstract
Riemann zeta-function has had a lot of research progress and applications in recent 50 years. The Fibonacci number is also widely used. This paper gives a derivation of the relation between the Riemann zeta function and the Fibonacci number. Generating functions are used to process the Fibonacci number, and then associate the Fibonacci number with the Bernoulli number. The connection of functions makes the appearance of Zeta possible, and finally, the relation between the Fibonacci number and the Zeta function is obtained.
Quantitative Analysis of Higher Education Based on AHP-TOPSIS
Authors: Qi Hao , Wang Yuanshen , Liu Lvcen 
Published: December 2022

Abstract
The development of higher education is a hot topic in today’s era. To solve the problem of the imperfect evaluation system of multiple universities, this paper collects data from various universities in the Yangtze River Delta in China. It applies AHP-TOPSIS to score and evaluate different universities. We took the Yangtze River Delta region in China as an example to comprehensively evaluate universities. The scale of higher education in the Yangtze River Delta region and the quantity of higher education resources are at the top level in the country. Still, the quality of higher education in multiple universities is uneven. We need to select indicators to evaluate the universities in the Yangtze River Delta comprehensively. Thirty colleges and universities in the Yangtze River Delta region were sampled for the comprehensive evaluation. We collected six items, including the number of academicians in colleges and universities, the number of papers published in scientific journals such as Nature and Science, the number of critical disciplines, the number of national-level specialty majors, the number of master’s programs in first-level fields, and the number of doctoral programs in first-level fields. According to the Analytic Hierarchy Process (AHP), we get the weights of the six indicators as 0.1389, 0.1475, 0.1872, 0.1872, 0.1595, and 0.1796. Indicators are established to score colleges and universities based on the Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) and Analytic Hierarchy Process (AHP). The evaluation and ranking of universities in the Yangtze River Delta conducted in this paper are based on the combination of AHP and TOPSIS (AHP-TOPSIS).
Regularized K-means Clustering for Multi-View Data
Authors: Yu Miao 
Published: December 2022

Abstract
Clustering is a common problem in machine learning. Multi-view data can better express the integrity of data because most of the data currently processed is single-view data. Therefore, the problem of clustering analysis of multi-view data has attracted a lot of attention, and how to improve the accuracy of clustering analysis of multi-view data has become a hot topic. We propose the regularized K-means (RKM) algorithm to deal with multi-view data, based on the K-means algorithm, add regularization terms, which can avoid data overfitting. Through numerical analysis, the RKM significantly improves clustering performance to the comparison methods.
Numerical Simulation and Experimental Research on Oil Film Characteristics of High-Pressure Piston Pump Slipper Pair
Authors: Zheng Xiaofeng , Liu Tianbao 
Published: December 2022

Abstract
The high-pressure axial piston pump is widely used in the field of coal machinery equipment due to its compact structure, high power density, and easy variable control. Failure affects pump performance. In this paper, the sliding shoe pair of the high-pressure plunger pump is taken as the research object, the variation law of the oil film pressure field is numerically simulated by Matlab software, and the high-pressure pump sliding shoe pair test bench is built. The full-cycle dynamic evaluation of the influence of the speed change of the drive shaft on the oil film characteristics is obtained.
Computation of Two-Dimensional Poisson Equation Using the Third-Order Discrete Scheme of Finite Difference Method Based on Node Set Vector
Authors: Luo Zhizhong 
Published: December 2022

Abstract
A novel third-order discrete scheme of finite difference method based on node set vector for two dimensional Poisson equation is proposed in this paper. Studies on the basic discrete scheme of this method as well as the discrete scheme of the interior node and boundary node are carried out in detail. Computer programs are also developed to emulate a computation sample. The numerical computation results show that this discrete scheme is effective for the numerical computation of two dimensional Poisson equation.
Solving Nonlinear Partial Differential Equations via Deep Galerkin Method
Authors: Ji Xinjun 
Published: December 2022

Abstract
This paper introduces a one-dimensional nonlinear Black-Scholes equation. Because nonlinear models are difficult to obtain analytical solutions, finite difference schemes are usually used to solve them. Numerical solutions of partial differential equations have always been a hot research topic in the frontier; the finite element method, finite body method, and other methods are commonly used in research. In general, these methods require the use of grids to approximate the definition space of PDEs. When we have a finer grid, the more accurate solution will be. However, the smaller the grid, the higher the computing cost and the larger the storage space. Therefore, the meshless method is adopted in this paper.
Numerical Simulation of Deformation and Failure Process of Tunnel Surrounding Rock Based on Different Constitutive Models
Authors: Chen Lei , Wang Qian-wei , Du Ai-hua , Ye Wu , Tao Shuai 
Published: December 2022

Abstract
Based on five different constitutive models, the progressive failure process of deep hard rock was simulated, and the plastic zone, shear strain increment high-value zone, horizontal displacement, and maximum principal stress distribution of surrounding rock were obtained. The calculation results show that the plastic zone of surrounding rock calculated by MCSS and HBSS models is mainly concentrated in the floor and vault of the cavern, and the sidewall is not damaged. There is no shear zone in the surrounding rock, and the magnitude of horizontal displacement is 10-4. In the L-CWFS model, the hysteresis cohesion of friction strengthening is weakened, and the initial friction angle is 0. The calculated plastic zone runs through the surrounding rock, and the whole section is destroyed. The order of magnitude of the horizontal displacement extremum is 10-3. The MC-HB model simulates the spalling failure of the side wall, and the strain localization of the side wall is not obvious, and no shear band is formed inside the surrounding rock deeply. The N-CWFS-TSS model simulates the buckling failure process of the straight wall plate crack. A shear band is formed at the bottom of the straight wall and penetrates into the interior of the surrounding rock. The strain localization is obvious and the order of magnitude of the shear strain increment is 10-2. The calculation results are consistent with the results of laboratory tests and field observations, and the failure mechanism of the compression-shear-tensile-shear composite in the progressive failure process of the surrounding rock is clarified.
Determining the Potential Function of the Stationary Vector Burgers’ Equation
Authors: Wang Chang 
Published: December 2022

Abstract
We consider the inverse problem of determining the potential function of the stationary vector Burgers equations Δu – (u · ∇)u – q(x)u = 0. We give the well-posedness of the solution in H2 a small boundary value. Then, by linearization, we prove that the potential function can be determined from the boundary Cauchy data.
Fundamental theorems in Complex analysis
Authors: Chen Bofan 
Published: December 2022

Abstract
This article will first introduce the conception of complex numbers and then deal with some famous results in complex numbers. In the beginning, we prove the Cauchy-Goursat theorem and calculate the integral along a closed path in a domain on which the given function is analytic. We want to check the relation between a function being analytic, having primitive, and its integral along a closed path equals zero. In conclusion, for a given analytic function on a simply connected domain, integral along any closed path is zero. Using this conclusion, we can prove the residue theorem and the Cauchy integral formula. To prove the existence and uniqueness of Laurent expansion, we first prove the Laurent decomposition by the Cauchy integral formula and Liouville’s theorem. By Laurent’s decomposition theorem, we change the case into dealing with two analytic functions. But one of them is analytic at infinity. The definition of the analytic function is applied to get the result. It’s easy to notice that every singularity of a meromorphic function on a subset of the complex number is isolated. Since meromorphic functions are widely used in variable aspects, it’s important to study isolated singularities. Then by studying the unique Laurent expansion in the neighborhood of the isolated singularity, we can classify isolated singularity.
Experimental Research on Damage Detection Based on Time Domain Data and Bayesian Fusion
Authors: Guo Huiyong , Li Meng 
Published: December 2022

Abstract
Damages such as cracks often occur in engineering structures, and such damages often have the characteristics of time-domain variable stiffness. To effectively identify this kind of damage, a damage detection method based on time domain data and Bayesian fusion is presented in this paper. First, a hybrid model of the AR/ARCH model is used to identify structural nonlinear damage, and a damage indicator is also used: the second-order-variance indicator (SOVI). Although most of the nonlinear damage information is extracted by the indicator SOVI and ARCH model, some nonlinear information is still filtered out by the AR model part. Therefore, a linear cepstral metric indicator (CMI) based on the AR model is introduced to extract the remained nonlinear damage information, and further, the Bayesian fusion theory is applied to combine the results of SOVI and CMI to obtain complete nonlinear damage information and achieve better identification results. Finally, a three-story frame experimental model is used to demonstrate the effectiveness of the Bayesian fusion. Experimental results show that the Bayesian fusion method is superior to SOVI and CMI.
A Constant Sign Theorem for a Class of Semi-linear Elliptic Equations
Authors: Ye Yunhua 
Published: December 2022

Abstract
Many problems arising from physics and analytic and geometric properties of solutions to partial differential equations have strong connections with convexity. In the present manuscript, we use the level curve curvature formula to derive a differential inequality and prove a invariant sign property for a class of nonlinear elliptic problems.
Mechanical Action Mechanism and Crack Response Analysis of Slide Plate of No.12 Turnout
Authors: Chen Lei , Han Feng 
Published: December 2022

Abstract
In the course of maintenance and repair, the railway workshops of the Lan-Qing railway found that the slide plate was prone to injury and damage. In order to study the actual stress state of the slide plate during the running of the train, a finite element model of the slide plate and related components was established based on ANSYS, Hypermesh was used for meshing and mesh quality control, and the Mooney-Rivlin constitutive intrinsic model was selected to simulate the rubber plate. The stress state of the slide plate when passing through the turnout in the straight and lateral directions is analyzed respectively. The results show that there is stress concentration at the root of the tongue depressor of the slide plate, and large deformation exists in the middle of the base plate, the front end of the platform plate and the position of the guide iron when passing through the turnout directly and laterally. The stress state of the slide plate is simulated when the rail brace fails, and the maximum stress is found to be 279.24 MPa, which exceeds the material yield limit. Therefore, we should pay attention to the inspection of the condition of the rail brace during the maintenance and repair. Presenting cracks at the weld seam location, it is found that the crack has a significant effect on the dewelding of the slide plate, and the heel position is the weakness of the slide plate. When the crack length reaches 1.2 mm, there is a tendency to crack at the weld seam position of the slide plate, and when the crack length continues to increase, the crack will further expand and jeopardizing structural safety. The research results can provide a theoretical basis for the improvement, disease prevention and maintenance of the slide plate.