bluuebunny/crossref_metadata_2025_split huggingface dataset:
Digital twin for mobile robot modeling and simulation
Authors: Kang Ruwen , Dong Zhe , He Jiahuan 
Published: August 2024

Abstract
With the rapid development of mobile robotics, deploying robots in more realistic testing environments to accurately and rapidly validate control algorithms has become a major challenge in the current mainstream. Traditional robot simulation systems are mostly built on a two-dimensional plane, with poor visualization performance and an inability to reflect real testing environments. This poses a significant portion of the research and development costs when validating robot algorithm functionalities. To address the aforementioned issues, this paper proposes a solution based on 3D reconstruction technology to create a twin scene that accurately represents the real simulation environment. Unity3D engine is utilized to develop a 2D LiDAR distance measurement sensor, and a complete control process for mobile robots is built in Matlab/Simulink. This enables hardware-in-the-loop simulation testing. Through experimental validation, it has been demonstrated that prior to conducting full-scale physical simulations, robots can effectively simulate the control logic within the virtual environment. This allows for online adjustments of various parameters in the control algorithms, leading to improved research and development efficiency while reducing potential risks and costs associated with deploying robots in real-world environments.
Investigation of the interfacial bonding properties of NiAl-based composites
Authors: Sun Biao , Cao Tong , Qiu Bo , Zhang Geng , Ding Feng 
Published: August 2024

Abstract
NiAl-based composites with Ag2Mo2O7 addition were prepared by spark plasma sintering technology. The microstructure and interfacial bonding characteristics of NiAl-based composites were explored, and the wear mechanism was revealed at room temperature. The interfacial bonding properties were analyzed at the molecular level based on molecular dynamics. The results suggest that after sintering, Ag2Mo2O7 transforms into Ag and MoO3 phases, forming NiAl/Ag and NiAl/MoO3 interfaces. Plastic deformation and fatigue wear account for the majority of the wear mechanism in NiAl-based composites at room temperature. The binding energy of the NiAl/Ag interface is about 16% higher than that of the NiAl/MoO3 interface. Among them, the binding energy of the NiAl/Ag interface is 1.759 kcal/mol·Å2, and the binding energy of the NiAl/MoO3 interface is 1.475 kcal/mol·Å2. The fatigue spalling and microcrack of NiAl matrix composites at room temperature are attributed to the poor interfacial bonding properties between NiAl and MoO3.
Effect of ZnO on tribological properties of MoS2 dry film lubrication coatings
Authors: Duan Tao , Wang Qin , Cheng Peng , Mi Dewei 
Published: August 2024

Abstract
As a key component of the high-speed railway brake system, high-speed railway brake disc bolts are often lubricated with MoS2 lubrication coating, and the friction performance of the coating is a key factor in ensuring the operation of the equipment. The friction performance of the coating is a key factor to ensure the operation of the equipment. In this paper, the effect of ZnO on the friction performance of MoS2 dry film lubrication coating and the performance of MoS2 dry film lubrication coating were studied. SEM and EDS were used to characterize the coating morphology and abrasion marks, SEM and EDS were used to characterize the coating morphology and abrasion marks, and a friction and wear tester was used to study the effect of ZnO addition, particle size, and working temperature on the friction performance of the coating. It was found that the mechanism of ZnO is to harden and support the film-forming structure of the coating to ensure the integrity of the lubricant film and enhance the anti-wear performance of the coating. The optimal amount of ZnO is 5%, the optimal particle size is 30 nm, and the optimal operating temperature is 100°C. The results of this paper provide a theoretical basis for further optimizing the preparation and performance of MoS2 dry film. The results of this paper provide a theoretical basis for further optimizing the preparation and performance of MoS2 dry film lubrication coatings.
Mechanical properties of workpieces based on 3D printing
Authors: Zhao Mingxia 
Published: August 2024

Abstract
In view of the quality defects of 3D printed workpieces and insufficient mechanical properties of parts, the optimization of mechanical performance parameters of workpieces based on 3D printing was studied. Taking the FDM molding technology and 3D printing technology of PLA material as the research object, better mechanical properties of the device can be obtained by optimizing the printing temperature, filling rate, and other parameters of the workpiece spline. Experimental results show that for printing temperature, an increase in temperature will increase the ultimate strength of the material, but will also decrease the elastic modulus, so 195°C was finally selected as the processing temperature. For the filling rate and the number of contour turns, the larger the value is, the better the mechanical properties of the processed workpiece will be. The ultimate strength and elastic modulus will increase, but the elongation at break will decrease. Other parameters such as layer thickness, filling angle, etc. have less impact on mechanical properties.
Analysis of hydrodynamic performance of underwater accompanying robot based on CFD
Authors: Chen Yang , Liu Fanghua , Shao Jiawei , Miao You , Cao Yongxin 
Published: August 2024

Abstract
We design a novel underwater accompanying robot capable of collaborating with divers for joint operations to improve the efficiency and safety coefficient of underwater operations for divers by studying the impact of speed and drift angles on its hydrodynamic performance under various underwater conditions. Utilizing the computational fluid dynamics (CFD) method, applying the Realizable k − ε turbulence model, and incorporating standard wall functions for near-wall regions, Fluent software is employed to simulate fluid dynamics and solve hydrodynamic parameters for various underwater conditions and postures. Research findings indicate that conditions of horizontal straight navigation and vertical ascent/descent, pressure drag, and viscous drag on the robot exhibit a positive correlation with velocity. Experiencing variations in drift angle, the robot’s longitudinal movement is not significantly altered during horizontal maneuvering and remains consistent under the same velocity. Conversely, later resistance distinctly increases with larger drift angles. This study can offer valuable reference and insights for subsequent research on underwater accompanying robots.
Study on seismic performance of cold-formed steel frame structures based on software ABAQUS
Authors: Pan Futing , Gao Junlin , Wang Ying , Wang Tao 
Published: August 2024

Abstract
Cold-formed steel has many advantages such as high strength, light weight, good economy, and high construction efficiency, which is conducive to the industrialization and green development of buildings. The frame structure has many advantages, such as a flexible spatial layout, easy handling of facades, and simple construction. This study analyzes the seismic performance of cold-formed steel frame structures from three influencing factors: the floor numbers, the cross-sectional dimensions of cold-formed steel, and the strength of steel. The results indicate that the main factors affecting the seismic performance of cold-formed steel frame structures are the cross-sectional dimension and strength of the steel. The smaller the cross-sectional size of the steel is, the smaller the bending stiffness of the frame is, and the poorer the recoverability of the structure is. Under the same cross-sectional size, when the thickness of the steel is reduced by half, the horizontal bearing capacity of the structure approaches 48%. The higher the strength of the steel is, the faster its bearing capacity decreases and the worse its hysteresis performance is.
Plasticity constitutive theory considering material length parameters
Authors: Gong Zihan , Han Gaoxiao , Li Lidan , Chen Hao , Zhang Wengui 
Published: August 2024

Abstract
The traditional continuous medium theory introduces the homogenization assumption that the material remains constant from the macroscopic to the microscopic view, which has been successfully applied to the analysis of the macroscopic mechanical properties. When the dimensions are reduced to the microscopic view, the internal defects of the material start to appear, leading to the inhomogeneity of the material properties, which is, in practice, manifested as a ruler effect. Therefore, it is necessary to introduce the material length parameter into the structural theory to model the mechanical response of new materials. Based on the theory of size effect, many scholars have carried out a large number of studies. The most widely used theories are strain gradient theory and differential nonlocal model, mainly the first strain gradient theory, the second strain gradient theory, and the simplified strain gradient theory. Some scholars define it from the kinetic point of view, but most of these consider the intrinsic relationship of elastic materials. To further investigate the plasticity intrinsic theory, some scholars have proposed the gradient plasticity theory, the nonlocal plasticity theory, and so on. In this paper, based on the previous research results, we briefly summarize the development and outlook of the plasticity eigenstructure theory under the consideration of the length parameter of the material. Then, we derive the plasticity eigenstructure relation equation, the full-volume theoretical model, and the yield criterion corresponding to the Mises material under the consideration of the endowment size of the material from the perspective of the gradient theory of plasticity, and finally, put forward a new plasticity eigenstructure theory-higher-order nonlocal gradient theory. A new plasticity constitutive theory, the higher-order nonlocal gradient theory, is finally proposed, and the defining equations and their constitutive relations are derived in detail. The proposed theory is intended to provide a theoretical basis for analyzing the microdefects in materials.
Buckling characteristics of the multi-crack egg-shaped shell under axial pressure
Authors: Lv Hao , Zhu Yongmei , Zhang Suzhou 
Published: August 2024

Abstract
This study focused on the buckling characteristics of egg-shaped shells with single cracks and double cracks under axial pressure. First, the geometric parameters of the egg-shaped shell were designed, and a numerical model of the egg-shaped shell was established. Then, the initial crack was introduced into the equatorial weld of the egg-shaped shell, and the effect of the crack on the buckling characteristics under different wall thicknesses was explored, as well as the influence of crack angle and crack spacing on buckling characteristics under double cracks. The results indicate that there are three buckling modes of cracked egg-shaped shells, and the transition of these three modes is influenced by the length of the crack. When the egg-shaped shell contains double cracks, the impact on the ultimate load is greater when the two cracks are parallel. When the distance between the centers of two cracks exceeds a certain distance, it can be treated as a single-crack situation. The research results have practical reference value for the design of egg-shaped shells subjected to axial loads.
Microstructure and properties of Cu-Fe alloy prepared by spray forming
Authors: Huang Su , Lin Baosen , Zhang Zerui , Li Jianping 
Published: August 2024

Abstract
To prevent or reduce the issue of macroscopic segregation in metastable immiscible Cu-Fe alloys during solidification, the alloys were produced using spray forming technology and subsequently cold rolled. The Cu10Fe alloy microstructure characteristics were investigated, and its mechanical properties were evaluated and compared with those of cast alloys. The results show that the alloy produced by spray formed has a well-dispersed Fe phase and the grain size is smaller, which effectively suppresses macroscopic segregation. The mechanical properties of spray-formed Cu-Fe alloys are higher than those of cast alloys, and the tensile strength and elongation of the alloys after cold rolling are 584 MPa and 2.2% respectively. The study provides valuable insights into the optimization of spray deposition techniques for producing high quality Cu-Fe alloys.
Acceleration of the synthesis of single B-YB2SI2O7 feedstocks through modifying the grain size of SIO2
Authors: Wang Zelong , Guo Donghui , Jia Xinlei , Wang Shun , Zheng Tao , Jin Runze , Zhou Zhiliang , Zhou Ning , Xu Baosheng 
Published: August 2024

Abstract
The purpose of this study is to create single-phase β-Yb2Si2O7 feedstocks. Firstly, the single-phase β Yb2Si2O7 feedstocks were synthesized by using a micro-nano compound method. By adjusting the grain size of SiO2, the synthesis of β-Yb2Si2O7 was accelerated, and its mechanism was further investigated. Based on this, the appearance and phase structure of β-Yb2Si2O7 were studied, and the physical properties of β-Yb2Si2O7 were characterized. The results reveal that in the solid-phase synthesis of β-Yb2Si2O7, nano SiO2 exhibits greater advantages compared to micron SiO2 due to its nano-adsorption capacity and heightened reactivity when reacting with Yb2O3. This enhanced reactivity accelerates the production of β-Yb2Si2O7. When the molar ratio of Yb2O3 and SiO2 is 1:2.3, the single phase β-Yb2Si2O7 feedstocks were effectively manufactured by sintering at 1, 500°C for one hour. The β-Yb2Si2O7 feedstocks have a particle size distribution with d
10, d
50, and d
90 values of 20.56 μm, 33.85 μm, and 52.65 μm, respectively. The β-Yb2Si2O7 feedstocks have apparent and tap densities of 1.66 g/cm3 and 2.05 g/cm3, respectively. In summary, single-phase β-Yb2Si2O7 feedstocks can be the preferred materials for EBCs.
Experimental study on frost resistance of steel fiber reinforced concrete
Authors: Li Jiuyang , Zhu Yuepeng , Luo Jingwei , Fan Xinmei , Wang Xiaoyu , Chen Li , Li Fan , Zhang Zicheng 
Published: August 2024

Abstract
To study the application of steel fiber reinforced concrete in cold areas, a rapid freeze-thaw test was carried out for C30 grade steel fiber reinforced concrete with a steel fiber content of 0.4%, 0.8%, 1.2%, and 1.6%, respectively. The results show that in the case of increasing freezing and thawing times, the failure pattern of the specimen is aggravated obviously. However, with the addition of steel fiber, the mass loss rate of the specimen is gradually reduced, and the initial tangent modulus and flexural properties are improved. The freezing resistance of the specimens has been improved continuously. Steel fiber can effectively resist the durability damage of concrete after the freeze-thaw cycle.
Stability of viscoelastic fluid conveying pipe
Authors: Shen Yu , Wang Bo 
Published: August 2024

Abstract
In this paper, the dynamic stability of a pulsating fluid transport viscoelastic pipe under transverse vibration in the supported case is investigated, and a new variable-length beam element taking into account the beam rotation effect is proposed, which incorporates Kelvin-type viscoelastic intrinsic relations to describe the material properties of the beam-type pipe. Stability conditions are given for the subharmonic and combined resonance cases. Numerical models were used to analyze the stability of viscoelastic fluid pipes under the influence of different factors.
Enhanced photoluminescence efficiency and stability of CsAgCl2 by a NaCl-assisted synthesis
Authors: Zhang Jili , Li Sen , Yang Peng , Zhai Yusheng , Zhang Ruiliang , Zhang Lin , Sun Long , Su Zhan , Gao Yan , Zhang Zhifeng 
Published: August 2024

Abstract
Here, a NaCl (x = Na/Ag = 0.5) assisted strategy was used to synthesize pure phase CsAgCl2 micro-crystals (MCs) with enhanced photoluminescence (PL) efficiency and stability. Adding a certain amount of NaCl during the preparation could result in high purity of final CsAgCl2 products and higher photoluminescence quantum yield (PLQY), better heat, UV light irradiation, and moisture stability. The CsAgCl2 MCs synthesized in this study displayed a wide PL spectrum spanning from 350 to 750 nm, featuring a peak emission at 544 nm and achieving a remarkable peak PL quantum yield (PLQY) of 73%. The extensive PL spectrum and a substantial Stokes shift of 260 nm provide evidence for the emission mechanism attributed to self-trapped excitons (STEs) within the CsAgCl2 MCs. The dual STE emission originated from two emitting triplet excited states and was observed in the low-temperature PL spectra. A thermal-assisted energy transfer happened with the temperature increase (10~300K), contributing to the efficient STE emission of CsAgCl2 MCs. In conclusion, the pristine CsAgCl2 MCs were employed as a sole phosphor material for encapsulating a 270 nm UV chip for white light-emitting diode (WLED) applications. Despite exhibiting a half-lifetime of 35 minutes under a continuous driving current of 10 mA, the WLED demonstrated notable stability in CCT, CRI, and CIE color coordinates. The resulting device emitted warm white light, characterized by Commission Internationale de l’Éclairage (CIE) color coordinates of (0.48, 0.45), a low correlated color temperature (CCT) of 2734 K, and a high color rendering index (CRI) of 81.9. These results demonstrated the unique advantages of CsAgCl2 MCs in high-performance single-phosphor WLEDs.
Biaxial tension test of soft materials
Authors: Li Minxing , Yang Ming , Wang Huiming , Bao Ronghao 
Published: August 2024

Abstract
A specific loading machine is designed and fabricated to test the constitutive properties of soft materials by biaxial tension in this study. The finite element model under ABAQUS is launched to simulate the biaxial tension of a squared specimen, and it is verified by a theoretical model. Using the finite elements model, the effects of clamping conditions of the squared samples, including the clamping width, clamping depth, and clamping numbers, are systematically studied, which helps improve future machine design. The comparison of numerical results with experimental results is conducted by equibiaxial test and pure shear test. Finally, a novel testing procedure is suggested with the combination of numerical simulation and practical experiments to enhance the testing result.
Application evaluation of TORSION DRILLING string
Authors: Zhang Zengbao , Lv Jianbo , Zhu Xiaoming , Liu Yuxin 
Published: August 2024

Abstract
The drill string torsion system, represented by Slider and Rocket, has been widely used around the world. It provides a solution with a high performance-price ratio to solve the problem of supporting pressure in sliding drilling. In recent years, the torsional system of drill string has been applied to a certain extent in China and has achieved good results in reducing resistance and increasing speed. Based on the analysis of the system composition, system functions, technical advantages, and application of the TORSION DRILLING string TORSION system, this paper summarizes the results of the field application of the system, some problems that need to be solved urgently and the improvement measures to be taken are analyzed. The results show that: (1) the application statistics of more than ten wells show that the torsional system of drill string can reduce the friction by more than 70% and increase the directional penetration rate by 20-300% when the supporting pressure is serious; (2) the angle torsion control is superior to torque torsion control in practicability, tool face placement and control, but the angle control depends on the availability of rotary table or top drive motor encoder, which brings great inconvenience to the popularization and application; (3) the current drill string torsion system suffers from a lack of automation, relying heavily on the expertise of field personnel, which limits its effectiveness. In response to these shortcomings, there is an urgent need to develop automatic torsion control software to enhance the system’s intelligence and efficiency. It is concluded that the TORSION DRILLING string TORSION system can significantly reduce directional friction, decrease the number and time of swinging tool face, increase the length and time of single directional DRILLING, and greatly increase the directional rop, to meet the requirements of torsion directional process.
Experimental study on the friction characteristics of the interface between piles and coral reef rock
Authors: Zhang Shoulong , Sang Dengfeng , Feng Guanghua , Su Shiding 
Published: August 2024

Abstract
The study aims to conduct coral reef rock-pile wall interfacial shear tests using a modified pile-soil interfacial ring shear instrument to gain insight into the friction characteristics between the two. The tests examined the interfacial friction behavior between the pile and the coral reef rock by simulating the engineering environment. Changing the different pressure conditions systematically recorded the change pattern of the friction characteristics. The test results show that there are significant differences in the friction characteristics between piles and coral reef rock under different environmental conditions, which provides a valuable reference for the design and construction of pile foundations in actual engineering.
A novel process on recyclable particle materials used for aggregate columns
Authors: Wang Mingyuan , Wang Yajun , Zhang Zuguo , Zheng Huifeng 
Published: August 2024

Abstract
The study focused on the creative development of aggregate column materials and technologies. The seawater (SW) and alkaline agents (AA) were invited to create the recyclable particle materials (RPMs) that were used for the construction of the aggregate columns in the marine environment. The building solid waste (BSW) was utilized to produce the fine powder the chemical activity of which was restored with the help of AA and marine processes. The created products in the study were the RPMs that were also cured in the marine environment. The mechanical and chemical properties were investigated with comprehensive approaches including UCT (uniaxial compression tests), EDS (Energy Dispersive Spectrometer), SEM (Scanning Electron Microscopy), and XRD (X-ray Diffraction). The investigation on the mechanical and chemical properties of the RPMs was carried out at three ages inclusive of 8-day, 49-day, and 583-day. The results from UCTs reported that the UCS (uniaxial compression strength) of RPMs reached 7.29 MPa at 583-day age even in the marine environment. EDS analysis detected the predominant element of RPMs and it was guaranteed that Al, Ca, and Si developed continuously with the age accumulation. Based on XRD and SEM exploration, the principal hydration products and compounds of RPMs used in the aggregate columns included C-S-H, C-A-H, C-A-S-H, N-A-S-H, and CaCO3. Particularly, the salt complexes generated in RPMs filled compactly the microscopic pores of RPMs, which resulted in its densified framework.