bluuebunny/crossref_metadata_2025 huggingface dataset:
Solving TSP Problems with Integer Programming
Authors: Yu Dian , Tao Yanrong , Ma Yue
Published: December 2022

The traveling salesman problem (TSP) is one of the NP-hard problems in combinatorial optimization. This paper focuses on finding the optimal planning path using integer programming and adding time allocation to minimize the cost. The use and accuracy of various algorithms are also compared in solving this problem.
An Exploration of Brannan’s Coefficient Conjecture
Authors: Cai Wenben
Published: December 2022

Complex analysis of a single variable is a type of mathematical analysis that observe properties for holomorphic functions. Over decades of development, complex analysis nowadays has played a more and more important role in algebraic geometry, fluid dynamics, quantum mechanics, and so on. This paper is to elaborate the Brannan’s coefficient conjecture, which was first proposed by D.A Brannan, J.G. Clunie, and W.E Kirwam in their paper on the coefficient problem for functions of bounded boundary rotation in 1973. The purpose of this paper is to give a detailed review and exploration of complicated but elegant proofs by D. Aharonov and S. Friedland. This paper mainly focuses on proving the inequality

(
1
+
α
x
)

n

(
1
−
x
)

p

≤

(
1
+
x
)

n

(
1
−
x
)

p

for p > 0 |α| = 1 within condition n ≥ 1, which was derived from Brannan’s coefficient conjecture. The proof of the inequality is done by dividing the techniques of complex numbers, trigonometric functions, binomial expansions, and other mathematical formulas into three different cases.
Neural Network for Solving Nonlinear Parabolic Differential Equations
Authors: Zhang Hong , Huang Hongying
Published: December 2022

We develop a cell-average-based neural network (CANN) method to compute nonlinear differential equations. Using feedforward networks, we can train average solutions from t0
+ Δt with initial values. In order to find the optimal parameters for the network, in combination with supervised training, we use a BP algorithm. By the trained network, we may compute the approximate solutions at the time t

n+1 with the ones at time tn
. Numerical results show CANN method permits a very large time step size for solution evolution.
Security Control for Time-Varying Delay Systems Based on Random Switching Moving Defense Method in Cyber-Physical Environment
Authors: Zhong Fuli
Published: December 2022

With the high digitization, informatization, and networking of practical complex systems, the security and reliability issue of systems control in the cyber-physical environment is becoming more and more critical, especially under the background of rampant network attacks nowadays. The security control for time-varying delay systems based on random switching moving defense method in a cyber-physical environment is studied in this paper. First, the security control model of one class of time-varying delay dynamic systems considering the actuator and controller attack problem is presented; second, controller design based on switching strategy for moving defense is studied; and then the security control scheme for time-varying delay systems based on random switching moving defense is presented for dealing with cyber attacks from malicious adversaries. Finally, multiple simulation results are presented to show the effectiveness of the proposed scheme.
Uncertainty Analysis of Accident Vehicle Speed Based on Tire Marks
Authors: Zhu Ke
Published: December 2022

Accidents without video information often cannot obtain trace information accurately, and it is difficult to accurately select parameters when using the tire marks formula, resulting in inaccurate results calculated during research and analysis. To obtain more authentic and reliable analysis results and improve the reliability and authority of accident identification and treatment, it is necessary to reflect the measurement error into the conclusion of calculation and analysis more completely and reliably, to ensure that the true value of the calculation result is within the calculation range of theoretical error. Therefore, through the Monte Carlo method and Subinterval method, the uncertainty analysis of the accident speed is carried out, and the accident vehicle speed is restored more accurately, which is conducive to the accident handling personnel to judge and analyze the accident speed.
Internal Ballistic Modeling and Simulation Analysis of High-low Pressure Low-overload Launch of Unmanned Aircraft
Authors: Hu Yuantao , Yang Guolai
Published: December 2022

The low-overload launch is an important research direction in weapon launch. In this paper, a new low-overload launch method is designed by using the piston-type high-low pressure launch principle combined with the secondary launch principle. Based on the classical internal ballistic equations and multi-body dynamics equations, the internal ballistic model of this low overload launch system is established. A joint simulation model based on MATLAB and RecurDyn is constructed to simulate the internal ballistic state during the launch process. The sensitivity of each parameter change of the high-low pressure system to the launch overload is also studied. The results show that the maximum low-pressure chamber pressure of the low overload launcher in this paper is reduced by 62% compared to the conventional internal ballistic pressure, the saturation of the pressure curve is also improved, and the muzzle velocity is accelerated; the maximum overload is reduced by 65%, which can meet the requirements of muzzle initial velocity and low overload when launching unmanned aircraft.
Network Data Encryption Transmission Method Based on the Noekeon Algorithm
Authors: Tian Jiong , Hu Changwu , Wang Xian , Fan Zesen
Published: December 2022

Given the problem of a high bit error rate in the current network data transmission process, to improve the security and confidentiality of data transmission, the Noekeon algorithm is introduced to carry out the design and research of network data encryption transmission methods. Combined with the multi-node communication technology, a multi-node network data transmission model and a topological structure model are established. Based on the Noekeon algorithm, the Gamma module and diffusion layer are used to encrypt the network data. Through the network data encryption transmission and the multi-node frequency synchronization compensation, the encrypted network data are transmitted by VPN networking. The comparative experiments show that the new transmission method can control the bit error rate below 10% in practical applications, which is significantly better than the previous transmission methods. The new transmission method can promote the security of network data transmission and protect users’ privacy.
Investigation of Displacement and Fracture Characteristics of Surrounding Rock under Strong Unloading Action
Authors: Lin Qindong , Feng Chun , Gan Yundan , Zhang Yulei , Yuan Jianfei , Jiang Haiyan , Han Lu
Published: December 2022

The rock burst causes a significant threat to the construction of the deep-buried tunnel, and the displacement and fracture evolution characteristics of surrounding rock are investigated during the rock burst. First, the full-time numerical simulation of the rock burst is conducted. Then, the displacement evolution characteristic of the rock is analyzed. Finally, the fracture evolution characteristic of the rock is analyzed. The results indicate that more and more surrounding rock near the left straight-wall segment undergoes fracture and movement with the increase of time, and the rock that heaps up in the tunnel mainly comes from the middle-upper part. With the increase of time, the volume V
r of rock moving into the tunnel and the fracture ratio α keep increasing, while the growth trends of V
r and α decay. The fracture degree of rock near the left straight-wall segment is the most severe, and the fracture area gradually expands with the increase of time.
The Retrospect and Prospect of GaN-Based Schottky Diode
Authors: Su Xinran
Published: December 2022

In the 21st century, with the continuous progress of human society and the continuous upgrading of the integrated circuit industry in recent years, the rapid development of modern science and technology makes us have higher and higher requirements for semiconductor products in our life and production. Compared with the first generation and the second generation of semiconductors, the third generation of semiconductors represented by GaN relies on its high electron mobility, bandgap width, electron saturation speed, high-temperature resistance, radiation resistance, and other suitable material properties. It has more and more extensive application prospects in the research field of microwave high-power devices. Today, the introduction of semiconductors in electronics improves the energy efficiency of equipments and modules. Gallium nitride (GaN) - based schottky diodes have broad application prospects in the next generation of schottky diodes due to their excellent performance. However, because of some technical concerns, these materials have not been fully developed. This work briefly summarized some science and technology related to GaN-Based Schottky Diode. A special focus will be put on the advantages and disadvantages of GaN-Based Schottky Diode, discussing some modern improved designs. Finally, possible breakthroughs of GaN-Based Schottky Diode will be summarized.
Transverse Momentum Dependence on Fourier Elliptic and Triangular Flow Harmonics in Mid-Central Pbpb Collisions at

SNN=2.76TeV
Authors: Zhang Shi , Wang Zimo , Li Xinwei , Shen Ruolin , Ouyang Chengxuan
Published: December 2022

We have collected particle collision data from the experiment using CMS apparatus, where we studied charged ions in the nucleus-to-nucleus collision’s PbPb branch in Pb at the 2.76 TeV energy scale. So far for the present work, we report the anisotropy of the thermal observational flux in lead-lead nucleon collisions at sqrt = 2.76 TeV. We observed that the collisions produced a large ion azimuth angle ranging from −π to π radian and a pseudo-conductance ranging from -2.6 to 2.6. In this work, we report the correlation function of transverse momentum, Pt
, Δη, and ΔΦ over a wide range of centroids. When the transverse momentum is about 1-2 GeV/c and Δη is in range -1 to 1, we observe a jet peak in the η and Φ correlation plot as the centrality increases. In the case of ν
2, which is an elliptic current signal, we measured it with a 4-part correlation method in the 40-50% centrality class. Asymptotic angular correlations in the far range have been studied by Fourier decomposition on the product of anisotropies when the cross-correlation is equal to 3-3.5 GeV/c. The obtained Fourier coefficients are factorized into the singular product of -ion Φ anisotropies. The assumptions of the hydrodynamic model with the shear viscosity correlation increase accordingly.
Research on Dynamic Nonlinearity of Materials Based on Tensile Test
Authors: Liang Enqiang , Kong Jiali , Zheng Minghui , Li Shengtao
Published: December 2022

The collision impact process of a structure is a complex nonlinear dynamic response process, and the key factor to ensure the accuracy of the calculation results when calculating the simulation collision problem is the definition of the dynamic nonlinear parameters of the material during the simulation analysis, and there is no uniform treatment for the collision impact problem. Based on Q235 steel, quasi-static tensile and high-speed tensile tests were carried out, and the material parameters were calibrated to meet the requirements of the collision simulation calculation based on the test data, considering the material strain rate sensitivity and material hardening properties. The research results can be used as a reference for the simulation of large structure impact problems.
Research on wear and high cycle fatigue performance of ceramic coatings produced on Ti-6Al-4V alloy by micro-arc oxidation
Authors: Fu Yuzhu
Published: December 2022

Ceramic coatings were produced on the surface of Ti-6Al-4V titanium alloy by Micro-Arc Oxidation (MAO) technique. The morphology and phases of coatings were investigated by scanning electron microscopy (SEM), and X-ray diffraction (XRD) technologies. The friction and high cycle fatigue properties were tested in coated and uncoated specimens. The results show that the MAO coatings were mainly composed of the anatase TiO2 phase, which grows in-suit on the surface of the substrate material. There was no transition layer between the coatings and the substrate, and a high bonding strength was obtained. The anti-abrasion properties of the coated specimens were improved because of the high hardness of ceramic coatings. MAO generates many micro-pores. During fatigue loading, the micropores act as notches to cause stress concentration, which can decrease the fatigue life of substrate material.
Analysis of loose roll mark of hot-rolled pickling alloyed galvanized automobile sheet
Authors: Zuo Rong , Xiong Taotao , Chen Ming , Zhu Bixue , Li Liejun
Published: December 2022

The loose coil mark of hot-rolled pickling alloyed galvanized automobile plate is one of the main defects affecting the quality of steel plates. In this paper, the composition of the loose coil mark and the coiling process parameters of the hot-rolled pickling galvanized sheet was analyzed. The results showed that the main reasons for the loose coil marks were insufficient friction between the coiler mandrel and the strip, and the coiling tension of the lead head was unstable. By increasing the lead rate of head coiling speed to 15 mpm and increasing the crimp tension limit, the loose coil marks of hot-rolled pickling alloyed galvanized automobile plate were significantly reduced, and the quality of the steel plate was significantly improved. The unqualified steel plate caused by the defect of plate loose coil marks was downgraded from 100 t/month to 15 t/month.
Effect of deep cooling times on the architecture and performance of DLC coating system
Authors: Bi Jun , Tian XianLiang , Gao Yuan , Li Liejun
Published: December 2022

At present, the research on deep cooling times mainly focuses on the influence of a certain material. The research on the deep cooling treatment process of the coating composite system focuses on the insulation time, deep cooling temperature, and cooling rate, and there are few studies on the influence of deep cooling times on the coating composite system. This paper preliminarily explored the influence of the cryogenic treatment process changing cryogenic times on the structure and properties of the diamond-like carbon film (DLC) coating on an M35 high-speed steel surface under the condition of a certain total holding time. When two cryogenic treatments were carried out at -140°C and -196°C, the content of the SP3 hybrid bond decreased. The bonding force of DLC coating is improved after several cryogenic treatments, but the wear resistance of DLC coating decreases with the further increase of cryogenic times. This process has certain reference significance for improving the bonding force and wear resistance of DLC coating.
Analysis of the thermodynamic characteristics of particle reinforced multifarious compositions
Authors: Xiang Yu
Published: December 2022

The mechanical characteristics of particle-reinforced multifarious compositions are virtually hinged on the characteristics of matrix materials, particles, and the characteristics of the interface between particles. The composite material can be used to improve the disadvantages of a single raw material and expand the scope of application. Multifarious compositions have the advantages, such as high specific strength, high fatigue resistance, and high specific stiffness. For this reason, it is widely and specifically used in aviation manufacturing, aerospace technology, and transportation. Composite materials, titanium alloy, aluminum alloy, and alloy steel have become the main structural materials for aircraft body manufacturing, which is conducive to the improvement of fuel efficiency, simplifying system installation, and shortening assembly time. This research introduces a three-phase theoretical model to analyze the thermodynamic characteristics of particle-reinforced multifarious compositions. The effects of particle volume fraction, particle shape, and interface layer thickness on particle thermodynamic characteristics are analyzed and described.
Study on the hot deformation behavior of SAE8620RH gear steel
Authors: Chen Songjun , Li Liejun , Li Jiao , Xie Dongsheng , Zhu Chenghui
Published: December 2022

The rapid development of new energy vehicles has put forward higher requirements for the performance and precision of high-end gears. Reasonable thermal deformation parameters play a major role in controlling mechanical properties of gear steel. The stress-strain curves of the SAE8620RH gear steel were obtained by a single-pass compression test combined with the Gleeble-3800 simulator, and the effect of thermal deformation parameters on dynamic softening behaviour was analyzed. Results showed that with deformation temperatures increasing, dynamic softening mechanism changed from dynamic recovery to dynamic recrystallization. Increasing the strain rate inhibited dynamic recrystallization. However, under the condition that full dynamic recrystallization could have occurred; Higher strain rates can produce finer recrystallized grains. In addition, dynamic recrystallization grains were unevenly distributed and appeared to have abnormal grain growth at low strain rate and high temperatures.
Effects of solution treatment on microstructures and properties of Mg-Nd-Zn-Y-Zr alloy
Authors: Su Zaijun , Zhang Longguang , Zou Liming , Chen Huilie , Li Haiquan , Li Rongrun
Published: December 2022

The effects of solution treatment on microstructures and properties of Mg-2.4Nd-0.2Zn-6.0Y-0.5Zr alloy were studied. The research conclusions show that the cast alloy is comprised of α-Mg, Mg12Nd, Mg24Y5, MgYx, α-Zr phases. After solution treatment, the Mg12Nd and Mg24Y5 phases gradually dissolve into the matrix, while there are also MgYx and α-Zr phases near the grain boundary. The weakening of the second phases strengthening and fine grain strengthening offset the solid solution strengthening, resulting in a slight improvement of the tensile strength and yield strength. However, the elongation of alloy increases by 125%, which attributes to the elimination of the crack sources. The best solution treatment for the alloy is 500°C × 8 h.
Numerical simulation and flat tensile strength optimization of metal zipper
Authors: Zeng Wenhao , Mao Luyao , Huang Dong , Chen Qiyu , Zhang Huawei
Published: December 2022

Metal zippers are widely used in various engineering fields because of their compact structure, simple principle, and convenience. The flat pull strength is one of the most important indexes to judge the performance of a zipper. The methods used to optimize and improve the flat pull strength of a zipper are important for obtaining higher reliability. In this paper, the method of finite element analysis is used to establish the numerical model of the flat tensile strength for a 5# metal zipper. Relevant numerical results were comparatively discussed with experimental results. Based on the constructed finite element model, the design of the zipper pull strength was optimized. The influences of the chain tooth characteristic parameters such as the thickness of the chain tooth, the height of the chain tooth, the width of the chain tooth, and the spacing between the chain teeth on the pull strength were analyzed. The results show a good agreement between numerical simulation results and testing results. The optimization of characteristic parameters for the 5# metal zipper teeth was subsequently performed. The optimized structure indeed increases the frictional contact force between the teeth and enables the meshing between the teeth more consistent which eventually improves the flat pull strength.
Analysis of material selection trend of the automobile control arm
Authors: Song Tao , Xu Shujie , He Shaoqing
Published: December 2022

The material selection of the automobile control arm is related to the overall safety of the chassis system. With the advancement of material technology, the material of the automobile control arm has been changing. This article analyzes the trend of material selection for automobile control arms and finds the future direction of control arm material selection through the specific application data of the vehicle model, which can provide a reference for the selected research of automobile control arms
Optimization of stretch film former of fresh food packaging machine
Authors: Zhang Chao , Xu Na , Zheng Zhaoqi
Published: December 2022

Current research on fresh food packaging machines focuses on vertical and horizontal sealing. Compared with the conventional pillow packaging machine, the fresh food packaging machine still presents deficiencies regarding the feeding and forming ability of stretch film. This paper presents a step former for the stretch film to integrate the existing forming mechanism. First, by analyzing the movement diagram of the stretch film on the support plate, the optimal inclination angle of the stretch film during the process of feeding on the upper part of the support plate, and the center position of the second directional wheel on the upper part of the support plate was found, it can ensure that the stretch film in the process of feeding and forming has the minimum tension and not be broken. In addition, based on the above-mentioned, the support plate and the directional wheel were simulated in software. The 2 mm 304 stainless steel support plate and different plastic combinations of directional wheels were the optimal choices.
Cause analysis of stamping cracking and concealed cracking of tailgate inner plate
Authors: Liu Xueli , Huang Geng , Zhu Haoyu , Li Liejun
Published: December 2022

With the development of automobiles toward lightweight and comfort, the production of auto parts has higher and higher requirements for stamping materials and parts forming quality. During the stamping and manufacturing process of the passenger car tailgate inner plate, the tailgate inner plate has many cracks, concealed cracks, and other defects. In this paper, the fracture morphology of the defect section was observed, and the composition and mechanical properties were measured. At the same time, the production process of the steel plate and the working condition of the stamping die were analyzed. The results show that the cracking and concealed cracking defects of stamping sheets are mainly caused by the inclusion of die and sheet. Through the adjustment of the plate production process and mold, the cracking and concealed cracking defects disappeared. This work also provides a reference for the solution to stamping cracking defects in the future.
Analysis of stamping cracking of laser tailor-welded IF steel door inner plate
Authors: Xian Lingbiao , Wu Ke , Li Liejun
Published: December 2022

The parts produced by laser tailor welded steel plates are more and more widely used in automobiles, due to their advantages of high strength, low weight, and low comprehensive cost. However, the welding seam of the laser tailor welded steel plate is prone to cracking during the stamping process. Based on solving the problem of stamping cracking of the IF steel door inner plate supplied by our company, the mechanical properties and friction coefficient were tested on the base metal. In addition, the cupping experiment was carried out on the weld seam of the tailor-welded blanks, and the hardness and microstructure of the weld seam were also tested and analyzed. The results showed that the lap height difference was the main reason for cracking. By optimizing the height difference of tailor-welded blanks, the incidence of cracking was greatly reduced.
Cause Analysis of Tube Burst of the Condenser in a Power Plant
Authors: Xu Yang
Published: December 2022

A tube burst accident of the condenser is found in a power plant during operation. The causes of tube bursts are analyzed using macroscopic observation, chemical composition analysis, metallographic examination, scanning electron microscopy, and energy spectrum. The results show that the perforation of the condenser tube originates from the inner wall, and there are scour pits. There are corrosion products in the pits, and the content of the Zn element decreases significantly compared with the matrix. The corrosion should be dezincification corrosion accompanied by erosion corrosion. After the long-term operation of the condenser pipe, dezincification corrosion is still unavoidable. Pipes in different parts have been corroded and perforated, but the degree of corrosion is different. Therefore, it is suggested to replace and upgrade the condenser tube as a whole at the appropriate time.
Intercritical annealing treatment of PHS2000 and study of its microstructure and properties
Authors: Liu Lang , Li Liejun , Luo Zhichao , Peng Zhengwu , Gao Jixiang , Ren Jianping
Published: December 2022

Dual-phase steel (also known as DP steel) is the most widely used ultra-high-strength steel in automobile covering parts and structural parts. Since the concept of automotive lightweight has been put forward and deepened, the development of higher strength grade DP steel and the study of its microstructure and properties are of great significance. In this paper, the Gleeble-3800 thermal simulation machine was used to investigate the phase transition characteristics of the PHS2000. Scanning electron microscopy (SEM) was used to study the evolution of the microstructure under different heat treatment conditions, and the mechanical properties of dual phase microstructure under different conditions were analyzed. The results show that the microstructure of PHS2000 remains martensite with a high volume fraction after intercritical annealing and becomes full martensite after a long time of holding. At the same time, the tensile strength increases, and the plasticity decreases with the increase of the intercritical annealing temperature.
Design of Composite Joint with Precast Bolted Shear Connectors for The Fabricated Structure
Authors: Yang Zhishuo , Chen Mingxia , Chen Feixin , Chen Guocan , Dong Zuorong , Zhong Yiman
Published: December 2022

Because of the serious impact on the seismic performance, the joint connection form becomes a critical problem in the prefabricated building. Built on the dry connection, this paper proposes a detachable and recyclable bolt-steel plate connection design for the fabricated structure. Compared to the cast-in-situ method, the biggest advantage of the proposed design scheme lies in convenient construction. The construction process shows that the joint devices both are detachable and recyclable. Adopting a supported beam, the proposed form is simulated with the finite element method (FEM). The deformation results verify the effectiveness of the proposed connection design. The work provides a novel idea for further test research on the fabricated structure.
Research on the thermal management system of battery for electric vehicles
Authors: Wang Yuzhuo
Published: December 2022

Battery life is one of the most significant indicators of the performance of electric vehicles. The battery life of electric vehicles plays a significant role in the overall performance of the vehicle. Temperature difference and maximum battery temperature are the two major factors affecting battery life, so a system that monitors and regulates battery temperature should be advanced and reasonable. In this paper, we discuss the most commonly used thermal management systems, including air cooling systems, liquid cooling systems, PCM-based cooling systems, and hybrid systems, as well as the newest thermal management systems that have been developed in recent years. It firstly introduces the physical principles applied to the above cooling systems, then analyzes and compares the thermal values of the experimental objects with the help of mathematical models and images, and finally draws conclusions based on the comparison results and briefly. In summary, various thermal management systems have their advantages and disadvantages. For example, air cooling is cost-effective and simple to operate, but it cannot be used for high-power applications due to its inability to dissipate heat. The liquid cooling system is more efficient at dissipating heat than the air cooling system, but its disadvantage is its increased weight and volume. Currently, PCM-based thermal management systems offer the most potential, but they have not been widely used due to their high cost and complexity; the hybrid system can integrate the advantages of various systems, but the difficulty of structural design will be much greater.
Design and implementation of Visual Epigynous Machine on Robotic Sorting
Authors: Zeng Lingchao , Cao Yuhua , Xiao Chenjun , Zhong Xiaohua , Wei Shangming , Zeng Guanlin
Published: December 2022

Robotic assembly is an important process to replace manual picking in industrial smart manufacturing. One of the important steps in assembly is robotics grasping and sorting of the workpiece. In this paper, a lightweight visual epigynous system was designed to address sorting workpieces with high efficiency, portability, and accuracy. The software of the system was divided into a vision calculation module (VCM), an ethernet communication module, a system control module, and a real-time display module. VCM is responsible for obtaining the information of workpieces, which includes segmenting the images captured by the webcam sequentially and recognizing the digit, and calculating the angle by algorithms of AKAZE feathers matching with and orientation estimation for vector comparison. The proposed method in VCM performs best in estimating the orientation of the workpiece through the comparison of different template matching algorithms. The industrial field experiments indicated that the robot could satisfy the requirement of visual sorting. This system provides a practical and robust solution for industrial workpiece sorting applications.
Numerical simulation and analysis of flow field in directional solidification equipment
Authors: Cheng Zhang Zhi , Sun Hui , Wen Ning , Liu Tao
Published: December 2022

Directional solidification equipment is an efficient purification tool. In this paper, the geometric model was established based on the equipment, and the numerical simulation of the flow field in equipment was realized through the RNG turbulence model, flow volume function model, and the multiple reference system method. In order to improve the fluid velocity, turbulent kinetic energy, and uniform distribution of circulating flow in the flow field, the effects of different crucible structures, process parameters, and structure of rotator on the flow field were analyzed. The research results show that the round bottom crucible has a faster flow velocity in front of the wall, and the flow velocity distribution is uniform. When the rotator is located in the center of the flow field, flow velocity and turbulent kinetic energy are distributed more evenly. Controlling the rotational speed to reduce the air entering the liquid phase is conducive to preventing solidification from being oxidized. Considering the thickness of the solidified layer, increasing the blade length can help increase the fluid velocity.
6σ robust and optimal design of micro-motion platform based on kriging model
Authors: Wu Jianjun , Cai Wei
Published: December 2022

The two performance indexes of output displacement and inherent frequency are closely related to the design variables of the micro-motion platform. To address the problem that the design variables have certain fluctuations and the high nonlinearity between the design variables and the performance of the micro-motion platform, a multi-objective robust optimization method with high computational efficiency and high fitting accuracy is proposed. Based on the kriging agent model, the high-precision approximate functions of the key design variables with the output displacement and the inherent frequency are established by the Latin hypercube experimental design, respectively. With the maximum stress as the constraint, Monte Carlo simulation, 6σ robust design concept, and nondominated sorting genetic algorithm II (NSGA-II) multi-objective genetic algorithm are integrated to optimize the structure of the micro-motorized platform. The results show that compared with the traditional deterministic optimization method, the 6σ robust design considering parameter uncertainty effectively reduces the fluctuation of the performance of the micromotion platform and improves the resistance of the platform performance to disturbance under uncertainty.
Bending test and simulation of carbon fiber aluminum honeycomb sandwich structure
Authors: Rong Jian , Lv Haiqing , Li Jing , Chen Xuesheng , Zhang Youyi
Published: December 2022

According to the bending moment characteristics of carbon fiber aluminum honeycomb sandwich structure for the solar wing in use, this paper simulates and analyzes the large-scale bending samples and tests the bending samples at room temperature, 150 °C, and -150°C. The test results show that the bending performance is not different between low-temperature environment and room temperature environment, but the stiffness and strength at high temperature are reduced by 54.9% and 50%, respectively, compared with room temperature. Compared with the room temperature test results, the simulation results are about 10%, which can roughly reflect the bending performance characteristics of sandwich structures.
Preparation and property analysis of polyether polyol two-component rubber repair material
Authors: Nie Pengfei , Liu Zhiqiang , Liu Zhiyuan
Published: December 2022

In order to solve the problem that the damage of rubber material cannot be repaired quickly and conveniently, this paper studies a repairing agent that is easy to use and repairs quickly.The modifier is composed of A and B components. The A component can be obtained by blending polyether polyol 330N, chain extender, diethylene glycol, 330NH18 slurry, 330N acetylene black slurry, dioctyl phthalate DOP, catalyst, antioxidant, silane coupling agent and defoaming agent at room temperature and vacuum.The mixture of polyether polyol GE220, 220H18 and dioctyl phthalate DOP, MDI-3051 and MDI-100LL at room temperature and vacuum was used to obtain component B.When using, mix A and B components by 1:0.7-1.3.The repair agent is simple to prepare and easy to use, and can be used for repairing any type of rubber damage. It is not limited by space and shape of rubber parts. It can be formed in 1 minute, have strength in 8 minutes, reach 80% strength in 2 hours and put into use.
Research on path planning and scheduling of multi AGVs based on a two-way dual path map
Authors: Xie Sheng , Ling Caofu , Wu Hao
Published: December 2022

With the development of intralogistics technology in factories, multi-AGV scheduling is still an important problem that needs to be solved by the control system. Aiming at the path planning and scheduling problem of automated guided vehicle (AGV) in the factory loading and unloading work, this paper designs a two-way dual path map construction method suitable for the factory, introduces a two-way different weight map construction method suitable for the right path, and uses “simulated road conditions” algorithm to calculate the shorter path, takes the shortest driving distance as the optimization goal to carry out the task scheduling analyzed possible conflicts and gives corresponding solutions. To verify the correctness of the map construction and algorithm, the multi-AGV simulation is carried out by using a robot operating system (ROS). The results show that the proposed method can realize the stable operation of multi-AGV in the factory environment without conflict and collision.
Detection of Prohibited Items Based upon X-ray Images and Improved YOLOv7
Authors: Yuan Jinhao , Zhang Nanfeng , Xie Yuexuan , Gao Xiangdong
Published: December 2022

Safety inspection nowadays is an effective means to safeguard public security, which mainly relies on professional security personnel to carry out inspections. In order to detect automatically contraband in X-ray images, a new prohibited item detection method on the strength of the modified YOLOv7 algorithm is present. The spatial attention constructed by large kernel attention was introduced into the lower layer of the YOLOv7 backbone network to extract the remote dependence information and texture information of the lower layer feature map. The proposed method was tested on public X-ray data set for a safety inspection, and the result showed that the improved means can advance the detection accuracy of the model.
Scientific Opportunities at the ARIEL Electron Linac
Authors: Bernauer Jan , Corliss Ross , Gardner Susan , Hasinoff Michael , Kanungo Rituparna , Martin Jeffery , Milner Richard , Pachal Katherine , Suda Toshimi , Yen Stanley
Published: December 2022

This paper gives an overview of the scientific opportunities at the ARIEL electron accelerator identified in open discussion at the workshop, including applications in hadron structure, astrophysical processes, tests of quantum electrodynamics, dark matter and other BSM physics, and material science.
A new light particle is being born
Authors: Krasznahorkay A.J. , Begala M. , Csatlós M. , Csige L. , Gulyás J. , Krakó A. , Krasznahorkay A. , Nyakó B.M. , Rajta I. , Sas N.J. , Timár J. , Vajda I.
Published: December 2022

A few years ago we observed anomalous electron-positron angular correlations for the 18.15 MeV M1 transition of8Be. This was interpreted as the creation and decay of an intermediate bosonic particle with a mass ofm0c2=16.70±0.35(stat )±0.5(sys) MeV, which is now called X17. The possible relation of the X17 boson to the dark matter problem triggered an enormous interest in the wider physics community. We also observed a similar anomaly in4He, which could be described also by the creation and subsequent decay of the same X17 particle. Very recently, the11B proton capture reaction was used for exciting the 17.2 MeV broad (Γ=1.15 MeV) resonance in12C and studying their internal pair creation decay. Anomalies were observed in the angular correlation of the electron-positron pairs, which together with the8Be and4He data provides kinematic evidence for the X17 particle and supports their vector boson and fifth force explanation.
New Opportunities for the Study of Baryon Number Violation at Low-Energy Accelerators
Authors: Gardner Susan
Published: December 2022

I motivate new searches for baryon-number violation and consider, particularly, the prospects for detecting baryon number violation by two units at low-energy accelerators with intense electron beams, using ARIEL as a particular example.
The Effectiveness of Implementation Learning Media Based on Augmented Reality in Elementary School in Improving Critical Thinking Skills in Solar System Course
Authors: Zuniari N I , Ridlo Z R , Wahyuni S , Ulfa E M , Dharmawan M K S
Published: December 2022

This research aims to explore students’ critical thinking skills in Augmented reality-based learning media implementation on solar system lessons in elementary school. Critical thinking skills at the elementary school level are still relatively low due to the lack of application of learning media that support the improvement of critical thinking skills. Learning media is a very important part of learning. Research design compares modern classes (experimental classes) with control classes. Teaching using augmented reality-based learning media is carried out in experimental classrooms, while teaching is directly carried out in the control class. As a researcher using research and development methods with a qualitative approach to quasi-experimental research methods (pseudo-experiments) with pure experimental design, namely Pre-test Post-test Control Design. It can be known that the value of significance in this study is 39.5% or 0.395 to pre-test. The average pre-test value obtained for the control class was 46.60 with a standard deviation of 12.32 while the average pre-test value for the experimental class was 48.57 with a standard deviation of 11.20. The collection of post-test in the control class was 72.3214 with a standard deviation of 10.45291 while the average value of the experimental class was 90.1429 with a standard deviation of 6.89452. Based on the t-test it can be known that in the pre-test values of the two classes there is no significant or homogeneous difference. After being given the treatment of augmented reality learning media in solar system materials, the post-test values of both classes experienced a significant difference with a Sig.2-Tailed value of 0.000. The results of this study that the learning medium of Augmented Reality has an impact on students' critical thinking skills.
Characteristics of The PANI Thin Film Fabricated by The Electrodeposition Method and its Performance as an Alcohol Gas Sensor
Authors: Putri N P , Komariyah A Y , Sunarti T , Suaebah E , Rohmawati L
Published: December 2022

In this study, PANI thin film has been fabricated and applied as an active ingredient for alcohol sensors with different types and concentrations of alcohol. The method used is electrodeposition potentiostat with ITO as the working electrode. The PANI thin film was successfully synthesized at a constant potential of -0.4 V to +0.8 V at a scan rate of 100 mV/s. The method of determining the sensor's sensitivity is done by measuring the change in resistance of the PANI thin film using a Four Point Probe (FPP). Morphological results using SEM from PANI showed the shape of nanoparticles with an interconnected-sponge structure with a grain size of 35.28 nm. The results of sensor sensing measurements based on PANI for variations in concentration and different types of alcohol show that the sensor response to methanol gas is more significant when compared to ethanol and butanol gases. It has been proven that the PANI thin film can detect alcohol at small concentrations (5 ppm). The sensitivity value of the sensor indicates that the higher the alcohol concentration used, the higher the sensitivity.
Controlling Electronic Properties of FeCl2 Monolayer under LDA+U Approach
Authors: Prayitno T B , Nuryasin B , Budi E , Fahdiran R
Published: December 2022

The electronic properties of FeCl2 monolayer were inspected by using the LDA+U approach and including the spin-orbit interaction. By observing the band dispersion, it was shown that the metallic state changes to the insulating state by increasing the Coulomb repulsion. Moreover, the band gap and magnetic moment of Fe atom also increase as the Coulomb repulsion increases. For the magnetic state, it was also found that the ferromagnetic ground state was shifted to the antiferromagnetic ground state as tuning the Coulomb repulsion. It can be deduced that combining the spin-orbit interaction and Coulomb repulsion controls the electronic properties of FeCl2 monolayer.
Phase Formation, Structural, and Microstructural Characterizations of Ilmenite FeTiO3Nanopowder Prepared from Liquid-Mixing Method
Authors: Ermawati F U
Published: December 2022

Ilmenite FeTiO3is a wide-band gap antiferromagnetic semiconductor material and has very potential for applications in spintronic devices. Miniaturization of microelectronics and communication systems has become a necessity. Thus a material that can achieve high antiferromagnetic semiconductor properties in a small volume is therefore favourite. For that reason, particles of the materials must also be in the nanoscale. This paper reports the synthesis of nano-sized Ilmenite FeTiO3powder using the liquid-mixing method. Using this method, FeTiO3crystalline phase was initially formed at a temperature as low as 340 °C. The phase formation was analyzed from room temperature to 600 °C based on TGA/DTA, FTIR and XRD data. Rietveld's analysis stated that 84 % molar FeTiO3phase was formed at 340 °C, and the rest was TiO2rutile. By using the Scherrer method, the average crystallite size was calculated to be 38-43 nm, while the TEM data provides grain sizes of 20-40 nm.
The Physical Properties of Rocks in Blawan-Ijen Sempol District Bondowoso Regency
Authors: Astutik S , Nisa S L
Published: December 2022

Physical properties are the property of a rock after being tasted without damaging the rock. This research aims to describe the physical properties of rocks in Blawan-Ijen, including rock texture, rock density and rock porosity. The method of collecting data is carried out directly, namely conducting direct research in the field and indirect research by conducting library research. The physical properties of the rocks in Blawan-Ijen have a smooth and rough texture, holocrystalline, light and dark colors, and compact. The density value is relatively high, so it has a fairly high density and resistance. In contrast, the porosity value of the rocks in Blawan-Ijen has three categories: poor porosity, very poor porosity, and high porosity. The texture of the rocks in Blawan-Ijen is smooth, holocrystalline, has small cavities and dark in color.
Research on FPGA-based Sine Wave Transmitter
Authors: Wang Junkai , Gao Junxia , Wang Xuhong
Published: December 2022

This paper touches on a sine wave transmitting mode being designed applicable to multichannel high-power electromagnetic transmitters, well explaining the design scheme and working principle of each module. With FPGA as the core to build the hardware platform and DSP as a bridge to the cooperation between the upper computer and the FPGA lower computer, this very mode amplifies the MSK signal provided by the external interface with power and makes it featured high-power, high-energy efficiency as well as frequency accuracy, realizing the transmitting current as 0.01Hz~300Hz standard sine wave and MSK modulated wave output.
Simulation Research on Parameters Matching of Vehicle Engine Cooling System Based on AMEsim
Authors: Yuan Zhongrui , An Tong , Pan Yulong , Chen Haishan , Liu Yali , Zhan Caidong
Published: December 2022

The engine cooling system equipped on a 1.5T vehicle is regarded as the research object in this article, and the heat dissipation capacity under different working conditions of this vehicle is simulated based on AMEsim software. The simulation results show that the heat dissipation ability of this cooling system is insufficient under extreme high-temperature climbing conditions. Therefore, the component parameters of the cooling system need to be matched again, and the effectiveness of simulation tests is verified based on AMEsim software. The simulation research in this article has certain engineering application value. It can provide guidance for vehicle engineers of the Original Equipment Manufacturer (OEM) to match the parameters quickly in the early development process of the vehicle engine cooling system.
Energy efficiency analysis of coal-to-ethylene glycol distillation process based on exergy analysis
Authors: Zhao Xianbin , Jiang Shubo
Published: December 2022

The exergy analysis method is an important method for evaluating energy levels and energy efficiency. It is of great importance in the direction of process energy efficiency optimization. In this paper, the energy use of coal-to-ethylene glycol distillation process is comprehensively evaluated and analyzed using. Firstly, based on Aspen Plus process simulation, the basic data for exergy analysis were obtained; secondly, a detailed the results showed that the exergy efficiency of the deethylene glycol unit was the lowest, and the exergy loss of the reboiler was the highest. The exergy efficiency can be improved by appropriately changing the operating conditions such as feed position, reflux ratio and extraction ratio of the de-glycol unit.