bluuebunny/crossref_metadata_2025_split huggingface dataset:
Design of a Broadband Double-layer Absorber Using a Resistive Ink Based on Frequency-selective Surfaces Arrangement
Authors: Wang Jiawen , Fan Caizhi 
Published: September 2023

Abstract
The traditional way to enhance the absorption performance of absorbers is to optimize the structural parameters of the unit cell, taking no consideration of the coupling between units. Here, based on the first presented double-layer metamaterial absorber unit cell using resistive ink patterns printed on an FR-4 sheet, the impact of arranging the frequency selective surfaces within constrained units on the absorption performance is studied, providing a method to improve the absorption performance through absorption and phase cancellation of the unit cell by arranging frequency selective surfaces. The optimized double-layer absorber structure achieves over 90% absorption within 3.3~15.6 GHz with a small thickness of 10.05 mm, and exhibits a preferred absorption performance than the original one within the operating frequency band.
Design of integrated robot for risk waste transfer and disinfection
Authors: Lin Rongfeng , Fan Jianan , Sun Zhijin , Yan Yonghuan , Zhan Xianghui 
Published: September 2023

Abstract
In order to solve the traditional elimination process cumbersome, manual cannot involve part of the hidden places, single function, and other problems, we designed an integrated risk garbage transfer and elimination robot. The robot is integrated based on the parent and child machines. The mother robot completes the garbage transfer task and the child robot completes the indoor elimination task. With DJI STM32-F4 series as the core board, the integrated robot control system is composed of ultrasonic obstacle avoidance technology. This system can automatically identify and transport garbage, spray disinfectant and autonomous navigation for unmanned elimination. The combination of the integrated mother robot greatly improves the efficiency of elimination and provides support for the direction of disinfection and cleaning robots.
Analysis of Typical PCB Vibration Characteristics Based on Modal Simulation and Experiment
Authors: Cao Jingshuai , Qin Qiang , Wang Gang , Yang Pei , Qiao Hongkai 
Published: September 2023

Abstract
This study combines simulation and experimental methods to explore the vibration characteristics of a servo controller printed circuit board (PCB). CREO is used to build a simulation model based on PCB structure analysis. ANSYS was used to perform finite element simulation analysis of vibration characteristics. The hammering method is used to perform circuit board modal experiments. By comparing the results of simulation and experimentation, the PCB dynamic characteristics are analyzed. It was found that the fixed frequency error of the simulation and the experiment is within 6%, and the first three mode shapes are consistent. Hence, it is suggested to use the simulation model for the subsequent vibration reliability analysis of the electronic product.
Study on Effect of Ultrasonic Vibration on Adhesive-film Bonding of Al/CFRP Alloy Joints
Authors: Wang Hui , Zhang Chenkuo , Chen Yizhe , Yang Liu , Li Jianting , Cao Min 
Published: September 2023

Abstract
The adhesive film is solid at room temperature, and it is difficult to ensure the adhesion of the adhesive film to the adhered plate during the bonding process, resulting in poor bonding quality and difficult bonding quality control. Due to the need to solve this problem, this study proposed ultrasonic to improve the bonding quality. The ultrasonic mechanism to strengthen the adhesive-film bonded of AL/CFRP (carbon fiber reinforced composites) joints was investigated. The ultrasonic vibration was applied to the bonding area after the adhesive film was attached. A double-lap shear plate test revealed a 59.6% increase in bond strength and a 34.2% increase in bond quality stability. By analyzing the temperature and viscosity of the adhesive film after ultrasonic and observing the surface morphology of the cured joint, it was found that ultrasonic could reduce the film viscosity and improve the adhesive film fluidity. At the same time, the adhesive film was promoted to fill the irregular micro pits on the adherend surface, enhancing the mechanical anchoring effect between the adhesive and the adhered plate and thus improving the bonding quality.
Complex Deformation Behavior of GPa Grade Advanced High-strength Automotive Steel
Authors: Li Xiaotong , Liu Wenbo , Liang Xiao , Xu Xin , Su Hongying 
Published: September 2023

Abstract
To explore the complex deformation behavior of advanced high-strength automotive steel, the biaxial tensile test was carried out by using the thinned cruciform specimen. The stress in the central deformation area of the thinned specimen was analyzed by the simulation to verify the effectiveness of the specimen. The biaxial tensile test of metal sheets and the calculation method of yield trajectory were studied. The yield trajectories of DP980 and QP980 under different loading paths were obtained by using the strain-rate ratio control. The research results provide important technical support for improving the forming simulation accuracy of advanced high-strength steel DP980 and QP980.
Study of mixing characteristics of boiler slag in hexagonal cold slag tube
Authors: Li Renqiang , Huang Bo , Wang Jia , He Tao , Wang Manman , Zhao Fei 
Published: September 2023

Abstract
The slag cooler is an important auxiliary machine of the boiler. Taking the high-temperature ash particles in the hexagonal slag cooling tube as the research object, based on the EDEM discrete element method, a particle-particle contact model is established, and the mixing index and difference function are used as the mixing evaluation index, in-depth analysis of the impact of different filling rates on the mixing of high-temperature ash particles. The results show that as the filling rate decreases, the time for ash particles to reach stable mixing becomes shorter, and the time for particles to reach stable mixing under different filling rates is 22 seconds, 28 seconds, and 34 seconds, respectively. The smaller the filling rate, the smaller the fluctuation range of the difference function R and S values, therefore, the better the mixing effect of the particles in the material bed.
Modeling, simulation, and experimental study of personalized porous tooth structure formed by laser selective melting (SLM)
Authors: Li Weizhen , Jiang Libiao 
Published: September 2023

Abstract
The work aims to study and summarize the technology methods for personalized design and 3D printing for the human tooth, mainly including scanning the human model of the oral cavity with the lost tooth, dealing with the point clouds data, reconstructing the dental crown and dental root with porous structure, simulating the deformation and stress of different porous structure, and printing the different unit body by SLM 3D printing with metal powder material titanium alloys TC4. Finally, experiments are conducted to verify the performances of the printed unit entity with a porous structure. The conclusion is that the porous structure designed is effective for a closer elastic modulus E=2.20-3.00 GPa to the Human cementum. It can increase the matching between the elastic modulus of the patient’s jaw bone, reduce the stress shielding effect, achieve increased bone bonding area, improve bone bonding efficiency, and improve the long stability of implant bone bonding. It also has a 20.44 % weight loss. It becomes lighter and more economical. Through the research, the rapid and personalized customization forms can be realized to promote the further development of the dental reconstruction area.
Fatigue Life Analysis of Railway Axles under Pre-crack Conditions
Authors: Cai Guojie , Liu Chaotao , Xiao Xiangyu 
Published: September 2023

Abstract
This paper takes the wheelset of a certain type of EMU as the research object and checks the strength of the axle according to the standard, and the most dangerous section of the axle is determined to be 35 mm away from the inner edge of the wheel seat. A crack with a depth of 1.2 mm was prefabricated by an electric spark in this position, and the crack was extended to a semi-elliptic crack with a depth of 2 mm by a fatigue test. The remaining service life of the non-damaged axle and the defective axle were analyzed based on the cumulative damage theory and the damage tolerance design method.
Simultaneous improvements in strength, stiffness, and toughness of bio-inspired hierarchical topological interlocking geometry
Authors: Ding Zhongqiu , Duan Yugang , Xiao Hong 
Published: September 2023

Abstract
Structural hierarchy plays an important role in the mechanical properties of natural materials. In this work, the concept of hierarchy was applied to topological interlocking assemblies to integrate different toughening strategies of multiple biologicals. Multi-material additive manufacturing was adopted to fabricate the bio-inspired interlocking structures comprised of discrete hard building blocks and soft intricate interfaces. An approach combining finite element simulation with direct mechanical testing on 3D-printed samples was conducted to investigate the mechanical consequences of these samples. It was found that the introduction of hierarchical surface design enabled the original interlocking assemblies to own additional interlocking effects at a smaller length scale, resulting in increased strength, stiffness, and toughness by 42.4%, 31.2%, and 83.8%, respectively.
Flow characteristics of cooling nozzle for high strength after hot rolling
Authors: Liu Bowen , Shi Jianhui , Bian Liping , Chen Chi , Yao Yilong 
Published: September 2023

Abstract
To further improve the cooling strength and uniformity of hot rolled strip steel after rolling and optimize the structure and process parameters of high-strength cooling equipment, this paper combined the basic structural characteristics and characteristic parameters of high-strength cooling nozzles of hot rolled strip steel, using finite element analysis software. The effect of various pressure and structural arguments on the internal flow characteristics of high-strength cooling nozzles was studied. The results show that with the increasing of the system pressure, the flow rate at the manifold outlet also increases gradually, and the fluctuation of the jet velocity increases gradually, but the flow line trend of the internal velocity is unchanged. The change in the position of the main shunt hole can affect the change in flow rate at the nozzle outlet. However, when the pressure is greater than 0.3 MPa, the fluctuation range of the flow rate at the slot outlet tends to be larger. The relevant results provide some reference for the design of high-strength cooling equipment in hot rolling.
Mechanical Behavior of Porous Epoxy Resin Mixture under Thermo-Mechanical Coupling
Authors: Xu Heng , Yao Bo , He Chao , Zhang Haoming , Yu Zhaoyu 
Published: September 2023

Abstract
The porous epoxy resin mixture has good mechanical properties, more internal pores, and superior drainage performance. Referring to the relevant data of indoor tests, this article uses PFC2D to construct a digital specimen in two dimensions based on its grading characteristics and spatial structure characteristics of the porous epoxy resin mixture to investigate its mechanical behavior. The indoor uniaxial penetration tests are carried out first, then the results are utilized to calibrate the necessary meso-parameters for different contact types, and we conduct a virtual uniaxial penetration test under coupled action of stress and temperature. We compare and analyze the results of both two tests and the evolution behavior and failure mechanism of porous epoxy resin mixture are investigated. The results of this article can preliminarily form a basic understanding of the mechanical behavior of porous epoxy resin mixture and have important theoretical significance and engineering application value for the evaluation of its road performance.
The influence of surface morphology of the as-fabricated layer on the molten pool flow behavior during the forming process of the next layer for laser powder bed fusion
Authors: Xiang Zhaowei , Huang Yefan , Yin Qin 
Published: September 2023

Abstract
The surface morphology is essential for the fabricated quality of Laser powder bed fusion (LPBF) additive manufacturing. There is a trend that more and more researchers are an attempt to improve surface quality unlimited. However, besides the final layer for the fabricated products, which directly affects the performance and user experience, does the surface morphology of the as-fabricated layer have an altogether positive effect on the forming process of the next layer? Furthermore, does it need to improve the surface quality unlimited? In this research, three kinds of typical surface morphology, flat surface, balling surface, and periodic rough surface, were analyzed and simplified. Then a fluid-heat coupling numerical model was built considering the surface morphology of the as-fabricated layer. The flow behavior of the molten pool during the forming process of the next layer under different kinds of surface morphology of the as-fabricated layer was investigated. The results indicate that achieving an excessively high-quality surface morphology is needless, and an appropriate periodic rough surface is beneficial to improve the forming quality.
Numerical Simulation of Particle Transport in Semi-Dry Desulfurization Slurry
Authors: Zhang Wei , Zhu Qunzhi 
Published: September 2023

Abstract
Among the desulfurization technologies, semi-dry technology is widely used, with the advantages of low cost, low water consumption, and no secondary effluent, which is favored by most domestic and foreign users. For a power plant, the slurry after desulfurization of a semi-dry desulfurization plant has the phenomenon of pipeline deposition in the process of pipeline transportation, which needs to be cleaned every short period, increasing unnecessary costs. Therefore, it is important to master the deposition law to allow safe and productive pipeline operation and reduce unnecessary waste.
The Simulation of the Non-standard Five-axis Automatic Drilling Machine Tool Based on DELMIA
Authors: Tan Hong , Chen Qiang , Sun Hailong , Wu Chengxu , Li Xiankun 
Published: September 2023

Abstract
The structure and motion characteristics of a non-standard five-axis automatic drilling machine tool were analyzed, and the virtual simulation models were established based on DELMIA. In order to verify the correctness of the NC code and to simulate the machining process, the VBA method was used to develop a simulation module of an automatic drilling machine tool based on DELMIA.
Experimental and numerical investigation on the failure behavior of multi-spar composite box under bending and shear
Authors: Zhang Zhao , Yuan Fei , Li Xinxiang , Chen Xiangmin 
Published: September 2023

Abstract
Multi-spar composite boxes (MSCB) are common elements in structural design due to their high load capacity in different loading conditions. This paper presents an experimental and numerical investigation of the failure behavior of MSCB subjected to a combined bending-shearing load. Quadratic failure criteria and mixed-mode strain energy release rate criteria are used to predict the onset and propagation of damage at the inter-laminar interfaces of the MSCB, which was implemented into Abaqus/Explicit analysis via a user-defined material subroutine VUMT. At last, a good agreement between tests and numerical prediction was observed.
Numerical simulation study of electron beam welding of 2219 aluminium alloy
Authors: Ning Wei , Liu Hailang , Liu Haiyang , Tang Jie , Yin Wangyu 
Published: September 2023

Abstract
In arrange to consider the morphology of the weld seam of 2219 aluminium alloy electron beam welding as well as to obtain a well-formed welded joint, FLUENT software was adopted to electron beam welding numerically simulate the temperature field of 10 mm thick 2219 aluminium alloy. Along with the welding, the keyhole and temperature field of the molten pool changes constantly. The findings demonstrate that the liquid metal beneath the combined activity of recoil pressure and Marangoni convection causes the molten pool width to always increment and the depth to rise fast during the evolution of the keyhole and temperature field. The profundity and breadth of the liquid pool do not rise significantly at the same time when the energy of the fluid metal decays to a specific value, and the liquid pool has been in a steady oscillation state.
A metal-organic framework constructed by ferrocene and titanium clusters for CO2 photoreduction under visible light
Authors: Chen Xianqi , Li Yaqiong , Wei Zihao , Li Shenghua , Pang Siping 
Published: September 2023

Abstract
As a promising photocatalyst, titanium-based metal organic framework (Ti-MOF) has been widely used for the photoreduction of CO2. In this paper, we developed a new Ti-MOF named Fe-Tc, constructed from titanium clusters and ferrocene. Fe-Tc had a wide absorbance range and a good response to visible light. Introducing ferrocene gave it good separation performance of photogenerated electrons and holes. What’s more, Fe-Tc showed excellent photocatalytic activity of CO2 photoreduction. Its production rate of formate (HCOO−) reached 39.5 μmol g−1 h−1 under visible light, which was better than some classical Ti-MOFs.
An Improved Model for Hysteretic Behavior Investigation on the Twin-tube Hydraulic Adjustable Damper
Authors: Zhang Qiang , Li Huixiang , Wang Shengde , Zhao Deng 
Published: September 2023

Abstract
The damper, as an integral constituent of the automotive suspension system, assumes a critical function in determining the suspension’s overall performance. To enhance the ride comfort and stability of automobiles, further research on the performance of dampers is particularly important. In this paper, an improved mathematical model with a twin-tube hydraulic adjustable damper (THAD) was developed to analyze the hysteretic behavior. The cavitation process of THAD was studied by studying the compressibility of oil and the structure of the valve port. Mathematical model results and published data under compression stroke and rebound stroke are compared for different working situations. The simulation results consistently illustrate the correctness of the model.
Properties of Ag-GNP silver-graphene composites and finite element analysis of electrical contact coupling field
Authors: Wang Saibei , Wang Song , Chen Song , Li Aikun , Ma Hongwei , Zhao Shangqiang , Chen Yongtai , Zhu Mei , Xie Ming 
Published: September 2023

Abstract
By using powder metallurgy, new electrical contact materials of Ag-GNP with mass fractions of 0.2%–3% were created. The mechanical and electrical properties of the materials were studied, and the force-thermal-electric coupling fields of the electrical contact process were calculated using the finite element method. The findings demonstrate that GNP can greatly boost the material’s mechanical strength while also increasing its resistivity; nevertheless, concentration levels of less than 3 weight percent do not appreciably impair the silver matrix’s electrical conductivity. The finite element simulation gives the stress field, current density distribution, and temperature field during contact. A comparison of the theoretically calculated contact radius and the simulation results show the same trend of variation. Both the stress field and temperature field are enhanced with increasing GNP content. The temperature rise of the contact may be unfavorable when the GNP content is greater than 1 wt.%.
Development of complete sets of equipment for new intelligent carbon extruder
Authors: Sun Dehe , Shi Zhuang , Zhou Xuejun , Xie Jiuming 
Published: September 2023

Abstract
A complete set of equipment for a new type of intelligent carbon extrusion machine was developed in this paper. This equipment starts from batching and kneading, and then sends materials to the extruder chamber for stamping, pre-pressing, and extrusion. According to customer requirements, the extruded products are sized using a speed-measuring device, cut using an intelligent sizing device, and automatically marked. Finally, the material slot is moved and flipped to the quality detection system for quality detection and recording. Through on-site operation and production, the complete set of equipment for this new intelligent carbon extrusion machine meets user requirements.
The Dispersive Matrix perspective on Lepton Flavour Universality observables
Authors: Martinelli G. , Naviglio M. , Simula S. , Vittorio L. 
Published: September 2023

AbstractWe review the results of the application of the Dispersion Matrix method to semileptonic charged-currentB→D(*)decays. This approach allows to determine the hadronic form factors in a model-independent and non-perturbative way. Starting from lattice results at large values of the momentum transfer (or, equivalently, at low recoil), we are able to describe the form factors in their whole kinematical range without introducing any assumption on the functional dependence on their momentum transfer. We will focus on fully-theoretical determinations of theR(D(*)) ratios, which are an important test of Lepton Flavour Universality. Our Dispersion Matrix analysis allows to reduce the tensions among the theoretical and the experimental determinations of these quantities.
Imaging of muon track in CsI(Tl) crystal with single photon sensitive camera
Authors: Wang Zhimin , Li Min , Wu Diru , Liu Jinchang , Zhang Yongpeng , Meng Xiangcheng , Liu Caimei , Yang Changgen 
Published: September 2023

Abstract
This work presents a novel approach to visual photon imaging using a single-photon-sensitive camera and PMTs. The aim of this study is to measure and identify muon tracks from 2D images captured by CsI(Tl) crystal scintillator detectors. The proposed approach allows for direct observation of muon tracks with a reasonable signal-to-noise ratio, eliminating the need for additional amplification or external light sources. With further enhancements to the analysis and setup, this algorithm offers an innovative method for particle measurement in low-photon environments and enables precise direction measurement of scintillation detectors. The setup of the crystal and camera testing system, along with the identification algorithm for muon tracks, will be discussed in detail. This will encompass system calibration, the identification model, signal-to-noise ratio analysis, muon track confirmation, and expectations for future improvements and applications.