bluuebunny/crossref_metadata_2025_split huggingface dataset:
Application of electrical resistivity tomography (ERT) for vertical high-density polyethylene (HDPE) membrane detection
Authors: Chang Jingrun , Nai Changxin , Qiu Panpan , Zhang Luyu 
Published: August 2023

Abstract
At landfill sites, uncontrolled leachate is a serious cause of groundwater and soil contamination at landfills and can occur extensively when there are looploopholesin the vertical HDPE (High-density polyethylene) membrane. For this reason, detecting HDPE membranes is necessary. The conventional electrode running poles approach is limited, it reflects the distribution of resistivity in 2D subsurface profiles, which is difficult to deploy electrodes above vertical HDPE membrane. According to the structural characteristics and field conditions of vertical HDPE membranes, the two-row current and potential (CP) electrode array is proposed to be applied to the testing of vertical HDPE membranes. The forward geoelectric model of the vulnerability was built using pyGimli, and data on 1519 apparent resistivity were acquired. The previous knowledge without the vulnerability was taken into consideration as the constraint condition, and the regional control was added to conduct the inversion, all using the least square approach. The model was used to analyze data on the detection of vertical HDPE membranes in a landfill In Yancheng, and potential flaws were discovered. Results show that the CP electrical measuring device can be efficient, quick, and accurate in the positioning of vertical HDPE membrane hole detection, and it is a cost-effective method. To verify the results, in the vertical HDPE membrane, through the Wenner device, the inversion of the 2D profile, and low resistivity anomalies are detected. This is thought to be through the leachate of leakage of HDPE membrane resistance rate is about 1.8 ohm. The findings demonstrate that the vertical HDPE membrane susceptibility may be located and detected using a CP electrical measuring instrument, which is a practical and efficient approach.
Constitutive Equation and Processing Map of CoCrFeNiMo0.3 High Entropy Alloy Based on The Thermoplastic Deformation
Authors: Wei Menghan , Zhao Hui , Zhang Yu , Lu Yang , Li Mei 
Published: August 2023

Abstract
The unique characteristics of high entropy alloys are challenging the field of traditional materials science and are expected to apply innovations in fields such as aerospace and defense, making them one of the strong candidates. The thermoplastic deformation mechanisms and processing maps of CoCrFNiMo0.3 alloy were studied at a temperature (T) ranging from 950 - 1250 °C and a strain rate (

ε
˙

) ranging from 0.001 - 0.1 s−1. A sharp rise is observed in the flow curve in the early stage, as the strain increases, slowly increasing flow stress due to the presence of dynamic softening, then turns to decrease, finally reaches a steady state. The optimal processing area was at 1050 - 1250 °C and 0.001 - 0.1 s−1, and there is an unstable area appearing at 950 - 1050 °C and 0.01 - 0.1 s−1. The η in the hot processing region are high, and they are not in the instability region.
Finite Element Strength Analysis and Optimization of Cutting Tools Based on Fluid-Structure Interaction
Authors: Cui Yanhao , Peng Liang , Liu Chang , Hu Yi , Chen Zhenlei 
Published: August 2023

Abstract
In this paper, taking a cutting tool as an example and aiming at the problem of cutting tool stress and fatigue evaluation and optimization, a finite element model including the tool, shaft, and washer was established by using the methods of simulation and testing, and the stress and strain analysis of the tool in the working process was completed. A single fluid-structure coupling method was applied to calculate the dynamic load of the cutting tool in the process of high-speed food cutting, and ABAQUS was used to analyze the stress and strain under this load. Practical engineering applications showed that the method was practical and feasible, and the calculation results were consistent with the actual measurements. The established analytical model can accurately reflect the real working conditions of the tool, and the stress and fatigue of the key parts of the tool can be quantitatively assessed, providing a reference for the optimal design of the tool.
Restitution coefficient of various particles based on acoustic technology
Authors: Chai Yinfu , Zhong Wenzhen , Yang Chao , Shi Xinlin , Zhao Qingxin 
Published: August 2023

Abstract
The restitution coefficient is used to characterize the energy loss in particle impact, which is an important parameter for discrete element simulation and mechanical system motion analysis. However, the restitution coefficient of many materials needs to be determined, and the key material properties affecting the restitution coefficient are still unclear. In this paper, the acoustic frequency sampling method was used to study the restitution coefficients of 10 representative particles. The effects of material density and specific strength on the restitution coefficient and the relationship between the restitution coefficient and the damping coefficient were investigated. The results show that the particle restitution coefficient is inversely proportional to the density except for aluminium. The relationship between particle restitution coefficient and specific strength is not significant.
Design of foot-wheel cooperation walking assistance robot and control method for human-robot coordination movement
Authors: Li Junqiang , Liu Huanhuan , Yan Yanlai , Yang Dong 
Published: August 2023

Abstract
To meet the walking demand of people who is less able to exercise, a foot-wheel cooperation walking assistance robot is designed, a control method of human-robot coordination movement is proposed, and then the walking on-the-wheel system is realized. Firstly, the structure of the foot-wheel cooperation walking assistance robot is designed, the kinematics of human lower limbs is analyzed, and the movement relationship between the foot system and wheel system is established. Secondly, the control methods of the foot system and wheel system are studied respectively, composite control method is used to realize the function that the motion of the human foot is followed by the pedal. Based on the user’s walking information and the motion relationship between the foot system and the wheel system, the coordinated motion control of the foot system and the wheel system is realized. Finally, an experimental prototype of foot-wheel cooperation walking assistance robot is developed, then the foot-wheel cooperation walking assistance experiment is completed. Experimental results show that the function of walking on the wheeled system can be realized by the proposed human-robot coordination movement method.
The Seismic Response of Ultra-High Voltage Gas-Insulated Transmission Lines
Authors: Lv Wei , Zhang Lihong 
Published: August 2023

Abstract
As an important part of the substation, the seismic capacity of ultra-high voltage (UHV) electrical equipment is related to the safe and stable operation of the substation and the whole power grid. The UHV gas-insulated transmission lines (GIL) have many structural characteristics, such as long pipeline distance, the large span between supports and the obvious amplification effect of supports. Its natural frequency is close to the predominant frequency of the seismic wave, resulting in its susceptibility to resonance or resonance-like and high seismic susceptibility. In order to analyze the seismic performance of UHV GIL better, the vibration mode decomposition response spectrum method and the dynamic time-history analysis method are used to analyze the seismic response of UHV GIL in this paper. The search for seismic weak positions of GIL is a reference for effectively improving the seismic performance of UHV GIL.
Solidification process of the triple-tube latent heat storage system with novel tree-like fin
Authors: Liu Fei , Zhang Guanmin 
Published: August 2023

Abstract
Traditional rectangular fins will cause the area between the two fins to be difficult to heat and become a “dead zone”. In this paper, inspired by the shape of branches, a novel tree-shaped fin is put forward to promote the heat release property TTLHSS. The exotherm process of TTLHSS with rectangular fins and tree fins is numerically calculated by using Ansys Fluent software. In addition, the TTLHSS liquid fraction diagram, liquid fraction change curve, average temperature, heat release time, and total heat release were analyzed. The novel fin can significantly improve the heat release property of TTLHSS and accelerate the exotherm rate. Compared with the TTLHSS with straight fins, the PCM absolute solidification time in the TTLHSS with new tree-like fins is decreased by 43.1%, and the full heat release is slightly increased. This study provides the direction for the fin design of TTLHSS.
Working fluids for low-temperature waste heat from coal-fired unit for the Organic Rankine Cycle (ORC)
Authors: Cai Jianming , Liu Xin , Chen Linfeng , Ren Jianxing 
Published: August 2023

Abstract
With the process of industrialization, a lot of energy is consumed, and a lot of low-grade energy is produced in the process. To recover low grade heat energy from flue gas of coal-fired power plants, the organic Rankine cycle is built and improves energy utilization efficiency. Taking six working fluids, R245ca, R245fa, R123, R600, R601, and R600a, as an example, referring to the exhaust gas condition of a 300MW subcritical coal-fired unit, analysed the evaporation temperature on the net work and thermal efficiency and exergy efficiency, the influence of electricity production cost (EPC) and payback period (PBP). The results show that the net work of R123 is the largest with the same conditions, which improves the system performance. At an evaporation temperature of 400K with the objective of reaping the economic benefit, R245ca and R601 as equivalent values are able to be used in engineering.
Process mineralogy characteristics of a very fine disseminated refractory gold deposit
Authors: Lu Zhongbo , Li Guangsheng , Zhu Xingfu , Cai Mingming , Xu Chao 
Published: August 2023

Abstract
The grade, recovery rate, or leaching rate of gold concentrate obtained by the flotation process or cyanide leaching process of gold ore is low, which is typical refractory gold ore. In order to fully understand the properties of the gold ore and optimize the gold recovery process and indicators, the process mineralogy of the ore was systematically studied by means of chemical multi-element analysis, optical microscope, scanning electron microscope (SEM), X-ray energy spectrometer, automatic mineral parameter analysis system (BPMA), and other test methods. The results show that the average grade of valuable element gold in the ore is 2.98g/t, and the contents of harmful elements mercury and carbon are 0.50% and 0.32% respectively; The main gold ore is natural gold, with a small amount of silver gold and tellurium gold; The main metal minerals are pyrite, pyrrhotite, magnetite, hematite, etc; The main gangue minerals include quartz, feldspar, kaolinite, mica, calcite, etc. Under the condition that the grinding fineness is -0.074mm, accounting for 90%, the distribution rates of single gold and bare gold in the ore are 3.15% and 57.66% respectively, and the distribution rates of gold with pyrite and quartz crystals are 5.77%, and the total distribution rates of the three are 66.58%, that is, the maximum theoretical flotation recovery rate of gold under the grinding fineness, but the particle size and fineness of gold minerals are both 5 μ Below m, the particle size of some gold ores is less than 0.5 μ m. It exists in the form of fine particles, micro gold, or ultra-micro gold, and it is difficult to recover gold by the flotation process, so it is recommended to adopt the whole slime cyanidation leaching process.
Wing Optimization Design Based on Composite Global Hawk Unmanned Aerial Vehicle
Authors: Yang Mingxiao , Wang Sifan , Hu Kai , Liu Tongyan 
Published: August 2023

Abstract
Composite materials have become the approach to solve the high stiffness and light weight of unmanned aerial vehicle structures. The wing had an extremely important influence on the flight of the unmanned aerial vehicle. The optimal composite wing design aroused widespread attention since it enhanced the aerodynamic performance of unmanned aerial vehicles. This article was intended to optimize and design the unmanned aerial vehicle with advantages in aerodynamic performance. According to the parameters of the military-civilian integrated unmanned aerial vehicle, a three-dimensional model of the overall structure of the composite Global Hawk unmanned aerial vehicle was designed. The effect of composite materials on the wing and the optimization of the laminate layup structure were studied. XFLR5 software was utilized to analyze the aerodynamic performance of the wing. The original NACA0012 airfoil and the optimized NACA3412 airfoil of the composite Global Hawk unmanned aerial vehicle were analyzed respectively for structure and performance. XFLR5 software was utilized to conduct flight simulation under the set parameters, and the effect of changing the angle of attack on the wing performance was analyzed. The results demonstrated that the optimized wing outperformed the original wing in terms of the lift, drag, torque, and lift-drag ratio.
The effect of salt tracer dosage on the transport and mixing in a water model of gas stirred ladle with a moderate gas flow rate
Authors: Chen Chao , Allayev Arslan , Li Linbo , Qi Hongyu , Tao Xin , Zhou Feng 
Published: August 2023

Abstract
In water model studies of mixing in ladles, the used salt tracer dosage is somehow neglected. It was reported that the salt tracer might influence the fluid flow and measured mixing time in water models. This study focuses on the effect of salt tracer dosage on the transport and mixing in a water model of a ladle with a moderate gas flow rate. The 1:3 scaled-down water model of an industrial 130 t ladle is established. Both black ink tracers for visualization of the flow field and the salt tracer for measuring the mixing time are used. The results indicate that the main circulation flow is dominant for the transport of the tracer. When increasing the salt solution tracer dosage, the arrival time at upper points is delayed, which indicates that a portion of the salt tracer is flowing downwardly to the bottom of the ladle. Consequently, the salt tracers dispersed to the bottom of the ladle are enhanced and at a faster pace. The mixing time of all monitor points decreases when the dosage of the salt tracer increases. The tendency is even obvious at the top surface.
Super hydrophilic Sodium Alginate Coating on the Surface of Polyvinylidene Fluoride via Freezing and Salting-out for Achieving Emulsion Oil Purification
Authors: Xia Mengsheng , Xu Pengtao , He Qian , Chen Yan , Shi Qian 
Published: August 2023

Abstract
In recent, oily wastewater as a special contaminant has seriously impacted the ecological environment. In this work, nature and green materials are used to prepare the SA-PVDF membrane taking freezing and salt out super hydrophilic modifying. Therefore, obtained membrane exhibited good membrane flux, excellent recyclability, and superior separation efficiency. More importantly, obtained filter membrane was green, eco-friendly, and cost-affordable. Therefore, such a simple, universal, and facile method could be used in other organic and inorganic materials for preparing filter membranes, which plays a significant role in construing novel filtration membranes to remove oil from oily wastewater in practical life.
Low-cycle Fatigue Behavior and Microscopic Morphology of Fatigue Crack Structure of Al-Cu-Ag-Fe-Mg-Zr-Er Alloy in The Aging Treatment
Authors: Zhao Yuhang , Fan Ruicheng , Gao Ying , Li Yifan , Ren Yanjie 
Published: August 2023

Abstract
Al-Cu-Ag-Fe-Mg-Zr-Er alloy with different content of Er addition was prepared by using metallurgy processing. The Al-4.5%Cu-0.5%Ag-0.35%Fe-0.38%Mg-0.1%Zr-xEr alloy phase and its refinement mechanism were studied with SEM. Tensile and fatigue tests were performed for the alloy in the state of deformation treatment condition. The microstructural observations reveal that the addition of 0.2% rare earth Er can effectively refine the grain structure of Al-Cu-Ag-Fe-Mg-Zr-Er alloy. It improves room temperature tensile strength, yield strength, and elongation at break. Under the condition of low cycle fatigue loading, Al-4.5%Cu-0.5%Ag-0.35%Fe-0.38%Mg-0.1%Zr-0.2%Er alloy shows a cyclic strain hardening in the cyclic stress response curves, which mainly depends on forming complex dislocation configurations. The accumulation of slip bands at the front of the grain boundary will lead to intergranular fracture of the material.
Comprehensive Coefficient Correction and Sensitivity Analysis of Important Parameters of Material Fatigue Strength
Authors: Zhang Tiezhu , Zhang Chunfeng , Zhao Haifeng , Ma Liping , Yu Shaoxuan , Yu Wei 
Published: August 2023

Abstract
The study of fatigue strength is of great significance in all fields. In fatigue design, converting the nominal strength of the material into the fatigue strength of specific parts in the working environment is an unavoidable problem in mechanical design. Therefore, it is very important to study the influencing factors of the fatigue strength of parts and how to correct these influencing factors to obtain the fatigue strength of parts. This paper conducts a more systematic study on the fatigue strength of mechanical parts. The effect of the interaction between stress concentration, surface processing, and size effect on fatigue strength is mainly analyzed. A more reliable comprehensive correction coefficient of fatigue strength is proposed, the existing comprehensive coefficient of fatigue strength is compared and analyzed, and the sensitivity of the proposed comprehensive correction coefficient of fatigue strength to stress concentration, surface processing, and size effect is analyzed experimentally. Finally, the proposed comprehensive correction coefficient of fatigue strength is relatively stable and can be applied to mechanical design.
Free Arc Disperses-Sprays Carbon Nanotubes and Silicon Carbide, Preparing Thermal Silicone Grease
Authors: Zhang Chuanqi , Shi Song , Bi Lansen , He Liangqing , Li Wei , He Yan 
Published: August 2023

Abstract
Thermal conductivity grease (TSG) is an important interface material for electronic devices’ heat dissipation. A continuous free-arc dispersion-spraying method of carbon nanotubes (CNTs) and nanocrystalline silicon carbide (SiC) for the preparation of TSG is reported. CNTs and SiC are dispersed and mixed by a free arc and are sprayed on the silicone oil surface (carried by the conveyor belt). Then, the silicon oil is separated from the conveyor belt, and the TSG composite (TSG-E) with highly dispersed CNTs@SiC is prepared. In this work, TSG-E has a CNTs@SiC network with CNTs as the frame and SiC as the node. Compared with untreated (TSG-N), grind (TSG-G), and ultrasonic (TSG-U) dispersion methods, TSG-E has better thermal conductivity (λ) and resistivity. CNTs@SiC network of the TSG-E series affects λ, the effect follows the thermal conductivity network theory and has a sudden change (greatly decreased) from TSG-E0.2 to TSG-E0.3. Besides, the sudden change of thermal stability for the TSG-E series is consistent with the change of λ.
A Fast Reconstruction Algorithm for Stereolithography File Topology Based on Hash Tables
Authors: Wu Yan , Kong Weipeng , Guo Zhiyuan , Han Shizhan , Li Zhaoyang 
Published: August 2023

Abstract
Aiming at the problem of redundant data and loss of original topological relations in the conversion of 3D models into STL files in the engineering manufacturing process, a hash table structure based on the square-taking method and the chain table method is established based on extracting the information storage characteristics of STL files, and a fast reconstruction algorithm based on the hash table for the topological relations of STL files is proposed. The hash table is used to merge redundant point data, and the topological reconstruction of the model is completed by using the point table and face table structure to store the index value relationships of the vertex and face pieces. Finally, four example models are verified respectively. The verification results show that the algorithm reduces the storage space of STL files by 91% on average, and the topology reconstruction time is reduced by 25%, which improves the efficiency of processing such as layering and region division in subsequent manufacturing.
Compilation Optimization of DCU-oriented OpenMP Thread Scheduling
Authors: Zhou Qiang-Wei , Li Jia-Nan , Zhao Rong-Cai , Han Lin , Wang Xin 
Published: August 2023

Abstract
OpenMP is one of the mainstream parallel programming models in recent years. After version 4.0, OpenMP introduced a new target instruction to increase the functionality of heterogeneous programming, called OpenMP Offload. For the domestic heterogeneous platform DCU, the thread scheduling algorithm under OpenMP parallel computing has low performance in the default mode, which does not take the best advantage of GPU parallel computing and has wasted resources. To address this problem, this paper performs algorithm improvement at the compiler level, analyzes the available resources of the system by combining the DCU hardware facilities, then further parses the program based on its array information to get its program iteration number, reallocates the number of threads for different execution modes in OpenMP, and optimizes the thread group increase factor by combining the DCU hardware information to adjust the thread. This paper uses the SPEC ACCEL test set to optimize the number of threads in the DCU. In this paper, we use the SPEC ACCEL test set and Polybench standard test set to test the redistribution of threads and thread groups in two parallel modes using the thread scheduling optimization algorithm. The average speedup ratio of ACCEL was improved by 40%.
Multi-source Distributed Radar-Infrared Track Association Method Based on Spatial Geometry
Authors: Bai Hao , Yang Zhengzheng , Hu Jiangfeng , Mu Yang , Su Xiaolong 
Published: August 2023

Abstract
To improve the accuracy of track association between radar and infrared sensors, a multi-source distributed radar infrared track association method based on spatial geometry is proposed. This method uses rough association and fine association to judge the correlation between radar and infrared tracks. Rough correlation calculates the statistical distance through the weighted norm of the redundant information difference between radar and infrared tracks and determines the rough association threshold by hypothesis testing to obtain multiple radar tracks successfully correlated with infrared tracks. Fine association abstracts the radar and infrared tracks in the rough association into points and lines in space respectively. Through the method of spatial analytic geometry, the distance between the spatial points and lines is calculated, and the association results of radar and infrared tracks are obtained based on the spatial distance. The simulation results show that the performance of the track association method based on spatial geometry is better than that of the nearest neighbor method and weighted track association method in the application of distributed multi-source radar and infrared track association.