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Study of aerodynamic characteristics of a high-speed train with wings moving through a tunnel J. Cent. South Univ. (IF 4.4) Pub Date : 2024-04-17 Tian-tian Wang, Da-fei Huang, Jun-yan Wang, Fang-cheng Shi, Yan Zhu, Lei Zhang, Guang-jun Gao
A high-speed train with wings (HSTW) is a new type of train that enhances aerodynamic lift by adding wings, effectively reducing gravity, to reduce the wear and tear of wheels and rails. This study, based on the RNG k−ε turbulence model and employing a sliding grid method, investigates the aerodynamic effects of HSTWs with different angles of attack when passing through tunnels. The precision of numerical
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Improving blast-induced tunnel profile under different in-situ stresses J. Cent. South Univ. (IF 4.4) Pub Date : 2024-04-17 Zi-long Zhou, Pei-yu Wang, Rui-shan Cheng, Cui-gang Chen, Xin Cai
Contour blasting techniques with pre-cutting areas are deemed as promising methods to improve the contour quality of tunnel with high in-situ stress. However, their performance under different in-situ stresses has not been well studied. In this paper, the performance of two typical contour blasting techniques, i. e., smooth blasting (SB) and pre-splitting blasting (PB) with pre-cutting (PC) areas (namely
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Seismic fragility assessment of circular metro tunnels in loess deposit J. Cent. South Univ. (IF 4.4) Pub Date : 2024-04-17 Wei-yu Sun, Jun-cen Lin, Qin-guo Ma, Song-hong Yan, Hao Tong, Qing-guo Liang
The deterministic method is always adopted for the seismic resistance of loess tunnels. Considering the randomness of ground motions, the seismic fragility assessment of a shallowly buried circular tunnel in the loess region was carried out under pseudo-static conditions with seismic loading in the transversal direction. The displacements calculated by one-dimensional analysis were applied to obtain
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Application of genetic algorithm to enhance the predictive stability of BP-ANN constitutive model for GH4169 superalloy J. Cent. South Univ. (IF 4.4) Pub Date : 2024-04-17 De-yu Zheng, Yu-feng Xia, Hai-hao Teng, Ying-yan Yu
In order to better characterize the plastic flow behavior of GH4169 superalloy, isothermal compression tests of GH4169 superalloy at different temperatures and strain rates were carried out using Gleeble 1500 thermal simulator. The back propagation artificial neural network (BP-ANN) constitutive model of GH4169 superalloy was established based on true stress–strain data, and the relationship between
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Catalysis of CuO on degradation of organic substance in Bayer liquid J. Cent. South Univ. (IF 4.4) Pub Date : 2024-04-17 Meng-nan Li, Zhan-wei Liu, Heng-wei Yan, Wen-hui Ma, Cheng-cheng Xia, Qiang Liu
In this study, catalytic wet oxidation technology was used to remove organic substances from Bayer liquid. First, under the optimal conditions without a catalyst (13.98 g/L of O2 addition, oxidation temperature of 220 °C, and oxidation time of 100 min), the removal efficiencies of total organic carbon, sodium humate, and sodium oxalate were 86.59%, 92.96%, and 71.36%, respectively. The mechanism of
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Brazing of C/C composites and 304 stainless steels via Ni/Mo composite interlayer J. Cent. South Univ. (IF 4.4) Pub Date : 2024-04-17 Yi-feng Xiao, Rui Zhang, Zhong-qi Hu, Liang Wu, Qian-kun Zhang, Yan Sun, Chun Li, Zhi-xin Xu
In order to improve the strength of C/C composites and 304 SS brazed joint, two substrates were brazed by adding metal interlayers (Ni, Mo, Ni/Mo) to BNi-2 or AgCuTi filler metals. The objective of this study was to investigate the microstructure, joint mechanism, and mechanical properties of the brazed joints. The findings revealed that the microstructure of the BNi-2+Ni/Mo joint consisted of Cr3C2
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Unraveling the impact of cutting transition section on the aerodynamic loads of high-speed trains: Utilizing the IDDES approach J. Cent. South Univ. (IF 4.4) Pub Date : 2024-04-17 Lun Zhao, E. Deng, Wei-chao Yang, Yi-qing Ni, Wen Zhao, Lu-sen Luo
The aerodynamic load of high-speed trains (HSTs) undergoes significant changes when they pass through the transition section of the cutting under crosswind conditions. This paper establishes a coupled train-cutting-wind three-dimensional aerodynamic model based on the improved delayed detached eddy simulation turbulence model, focusing on the influence of the cutting depth on the change of aerodynamic
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Intelligent diagnosis for hot-rolled strip crown with unbalanced data using a hybrid multi-stage ensemble model J. Cent. South Univ. (IF 4.4) Pub Date : 2024-04-17 Cheng-yan Ding, Jie Sun, Xiao-jian Li, Wen Peng, Dian-hua Zhang
To improve the smart manufacturing capabilities of strip hot rolling, based on digital twin (DT) and cyber-physical system (CPS), this paper proposes a data-driven approach for diagnosing hot-rolled strip crown. Since the hot rolling process features heredity, nonlinearity and strong coupling, the diagnosis of strip crown is an imbalanced problem with ill-defined decision boundaries. Conventional regression
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Influence of tunnel axis stress on mechanical response and fracture characteristics of rock surrounding tunnel subjected to gradient stress J. Cent. South Univ. (IF 4.4) Pub Date : 2024-04-17 Hong-gang Zhao, Dong-ming Zhang, Chang-bao Jiang, Ming-hui Li
The excavation of deep underground engineering leads to a gradient stress within surrounding rocks in the radial direction of the tunnel. In this study, we investigated the mechanical response and fracture characteristics of rocks subjected to gradient stress under different axis stresses. During the experimental process, an acoustic emission (AE) system was used to capture the AE signals. The obtained
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Characterizing low-frequency structure-borne noise from multi-span bridges on high-speed railways J. Cent. South Univ. (IF 4.4) Pub Date : 2024-04-17 Yuan-peng He, Qing Zhou, Xiao-zhen Sheng
As high-speed railways become increasingly prevalent in urban areas and operating speeds continue to rise, the issue of bridge noise has become a critical concern, giving that bridge sections account for over 80% of high-speed railway noise. As train speeds continue to increase, the number of bridge spans included in a noise prediction model becomes a crucial factor in accurately predicting bridge
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Aerodynamic effects of trains circulating through a bifurcated tunnel J. Cent. South Univ. (IF 4.4) Pub Date : 2024-04-17 Feng-yan Fang, Tang-hong Liu, Yu-tao Xia, Bin Xu, Xin-ran Wang, Xiao-shuai Huo, Hong-rui Gao, Gao-peng Liang, Wen-hui Li
In practice, bifurcated railway tunnels are occasionally employed in the construction of long tunnels due to specific geological reasons. However, the aerodynamic behaviors of trains moving through such complex tunnels are not yet fully understood. To address this issue, this study analyzes the aerodynamic interactions produced by a high-speed train moving through a bifurcated tunnel in different directions
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Preparation of aluminum-tin alloy by electrodeposition in low-temperature molten salt system J. Cent. South Univ. (IF 4.4) Pub Date : 2024-04-17 Hong-min Kan, Wen-xin Wang, Ling-ming Kong, Jiang Wu
AlCl3-NaCl-KCl low-temperature molten salt system with anhydrous SnCl2 was used to study the preparation of Al-Sn alloy by electrodeposition. The morphology and composition of the alloy were analyzed by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD); The corrosion resistance, wear resistance and antifriction of the alloy were tested and analyzed
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New insights of inorganic phosphate inhibitors for flotation separation of calcium-bearing minerals J. Cent. South Univ. (IF 4.4) Pub Date : 2024-04-17 Zhi-wen Guan, Fen Jiao, Xu Wang, Wen-qing Qin, Li-wen Fu, Zheng-quan Zhang, Wei Li
In this paper, the inhibition ability of tetrasodium pyrophosphate (TSPP), sodium tripolyphosphate (STPP) and sodium hexametaphosphate (SHMP) to scheelite, fluorite and calcite was predicted by performance calculation and further verified by micro-flotation test. The results of hydrophile lipophilic balance (HLB) calculation, group electronegative calculation and micro-flotation test indicated that
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Experimental study on electrode materials characteristics for dewatering and remediation of copper-contaminated sediment from Tai Lake based on vacuum electro-osmosis J. Cent. South Univ. (IF 4.4) Pub Date : 2024-04-17 Shao-yu Li, Yang Shen, Wen-cheng Qi, Kai-jia Chen
The vacuum electro-osmosis method enables integrated treatment of heavy metal-contaminated sediments by simultaneously removing water and pollutants. This study focuses on the dredged sediments from Tai Lake and investigates the performance of five electrode materials (electrokinetic geo-synthetics, graphite, aluminum, iron, and copper) in the vacuum electro-osmotic treatment process through a self-designed
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A seismic response prediction method based on a self-optimized Bayesian Bi-LSTM mixed network for high-speed railway track-bridge system J. Cent. South Univ. (IF 4.4) Pub Date : 2024-04-17 Kang Peng, Li-zhong Jiang, Wang-bao Zhou, Jian Yu, Ping Xiang, Ling-xu Wu
The construction of China’s high-speed railway (HSR) network has reached earthquake-prone regions, necessitating a timely and accurate post-disaster quick prediction approach to ensure the safety of the HSR systems’ transportation lifeline. This study proposes a fast prediction method utilizing a Bayesian self-optimized bi-directional long short-term memory (Bi-LSTM) network to develop a fast prediction
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Aluminum composite powder as an additive in epoxy coatings for enhancement of corrosion protection of carbon steel J. Cent. South Univ. (IF 4.4) Pub Date : 2024-04-17 Meysam Toozandehjani, Pooria Moozarm Nia, Ebrahim Abouzari Lotf, Farhad Ostovan, Mahnaz Shamshirsaz
Electrochemical impedance spectroscopy (EIS) and potentiometric polarization (Tafel) tests were utilized to investigate the corrosion protection efficiency of epoxy (EP) composite coatings reinforced with aluminum powder additives deposited on carbon steel substrate. Different aluminum powders including pure aluminum (Al) and aluminum composites powders containing alumina (Al2O3) and carbon nanotubes
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Effect of porosity on free vibration and buckling of functionally graded porous beams with non-uniform cross-section J. Cent. South Univ. (IF 4.4) Pub Date : 2024-04-17 Zeinab Bagheri, Alireza Fiouz, Mahmood Seraji
The purpose of this work is to investigate the effect of porosity on free vibration and buckling behaviours of non-uniform cross-section functionally graded porous beams. The material properties are considered varied along the thickness direction while the cross-section is non-uniform along the length of the beam. Three different patterns including symmetric, non-symmetric and uniform have been considered
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Heavy metal pollution and ecological risk assessment: A study on Linli County soils based on self-organizing map and positive factorization approaches J. Cent. South Univ. (IF 4.4) Pub Date : 2024-04-15 Hao Zou, Wu-qing Li, Bo-zhi Ren, Qing Xie, Zhao-qi Cai, Lu-yuan Chen, Jin Wang
This study analyzed the pollution level, distribution, sources, and ecological impact of six heavy metals (As, Cd, Cr, Cu, Zn and Pb) in soil from Linli County, China. The concentration analysis showed that the concentration of Cd in all samples exceeded the background value, and the exceeding rate reached 100%, while the average concentrations of other elements were similar to the background value
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Preparation and performance of a coal gasification slag-based composite for simultaneous immobilization of Cd and As J. Cent. South Univ. (IF 4.4) Pub Date : 2024-04-02 Chang-zhi Zhou, Qian Wang, Fang Zhu, Zai-jin Sun, Hong-liang Yin, Hong Hou, Jun-huan Wang
Coal gasification slag (CGS) and Fe-modified CGS (FGS) were employed to remediate cadmium (Cd) and arsenic (As) in co-contaminated agricultural soils. Adsorption experiments in aqueous systems and stabilization experiments in soil were conducted to evaluate the passivation potential of the CGS and FGS. The maximum adsorption capacities of FGS for Cd and As were 5.82 and 9.69 mg/g, while those of CGS
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Effective length coefficient of pier of multi-span continuous rigid-frame bridge based on transfer matrix method with branch J. Cent. South Univ. (IF 4.4) Pub Date : 2024-03-25 Hou-jun Kang, Zhong Guo, Xiao-yu Zhang, Xiao-yang Su, Yun-yue Cong
The effective length coefficient of the pier (ECP) is important for both the stability and the strength of the piers. The ECP of multi-span continuous rigid-frame bridge is calculated by a new model and the corresponding semi-analytical solution method in order to solve the stability of the bridge pier. Firstly, a general mechanical model of the n-span rigid-frame bridge is established, and its characteristic
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Acid corrosion micro-macro mechanism of enzyme-induced carbonate precipitation (EICP) treated sandy soils J. Cent. South Univ. (IF 4.4) Pub Date : 2024-03-25 Xin Yang, Meng-qiu Yan, Jia-nan Zheng
Carbon dioxide (CO2) geological sequestration is an effective way to control CO2 emissions, and the geological safety in CO2 injection project is the most concern problem. Enzyme-induced carbonate precipitation (EICP) technique is believed as useful to overcome CO2 leakage problem, but its main cementation matter, calcium carbonate, may be corroded by acidic CO2 solution. Therefore, laboratory studies
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Bearing effect of arched frame structures with longitudinal connections in large-section tunnels J. Cent. South Univ. (IF 4.4) Pub Date : 2024-03-25 Hong-bin Chen, Bei Jiang, Yu-jing Jiang, Qing-zuo Chen, Qiang-xun Wang
Aiming to improving the out-of-plane instability of I-steel arches in large-section tunnels, this study conducted the full-scale test of a single arch, the numerical test of the arched frame structures formed by the longitudinal connections and the arches, and the field comparison test. The results indicated that the failure mode of the single arch was local out-of-plane instability, leading to a loss
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Thermal and pressure performance of heat collection tube group in backfill body added with phase change material J. Cent. South Univ. (IF 4.4) Pub Date : 2024-03-25 Xiao-yan Zhang, Qiang-qiang Du, Lang Liu, Mu-yan Xu, Ya-ping Ke, Xue-li Wang
Combined with the backfill mining, the heat collection tube group (HCTG) in the backfill body can extract geothermal energy, which can effectively alleviate heat damage caused by high ground temperature. This paper takes the HCTG as research object, the temperature, velocity and pressure distribution of the heat transfer fluid (HTF) during the heat release process of the backfill body were analyzed
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Roof control mechanism and partition compensation support technology of gob-side entry formed by N00 mining method in thin coal seam J. Cent. South Univ. (IF 4.4) Pub Date : 2024-03-25 Jun Yang, Ben Liu, Ya-jun Wang, Jun Zhang, Shi-lin Hou, Yu-kun Wang, Xing Wu, Hong-cai Li
To achieve scientific and accurate support for the roadway roof in the N00 mining method for thin coal seams, the roof-cutting self-forming roadway is divided into two stages: the advanced chamber stage (Stage I) and the roof collapse and roadway formation stage (Stage II), considering its technological process and the characteristics of roof deformation. Using the Hoek-Brown nonlinearity rock mass
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Optimization mechanism of matrix microstructure evolution on strength-plasticity of Mg/Al composite plate during hard-plate accumulative roll bonding J. Cent. South Univ. (IF 4.4) Pub Date : 2024-03-25 An-xin Zhang, Feng Li, Wen-tao Niu, Rong-he Gao, Lu Sun
Mg/Al composite plate combines the light weight of Mg alloy and the plasticity and corrosion resistance of Al alloy, which significantly enhances its comprehensive performance. However, the long manufacturing cycle and high process requirements limit the rapid development of heterogeneous composite plate forming technology. Therefore, a new method of ARB (accumulative roll bonding) forming with hard
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Swelling inhibition and infiltration promotion mechanism of polyethyleneimine J. Cent. South Univ. (IF 4.4) Pub Date : 2024-03-25 Hui-fang Yang, Ao-yang Sha, Zheng-yan He, Ming Wu, Jun Qu, Chen-jie Wu, Zhi-gao Xu, Ru-an Chi
In order to solve landslides and slow infiltration rate in in-situ leaching process of weathered crust elution-deposited rare earth ore (WCE-DREO), the swelling inhibition performance and mechanism of polyethyleneimine (PEI) on montmorillonite (MMT) and WCE-DREO were investigated. The swelling inhibition effect on MMT and WCE-DREO increased gradually with increasing concentration of PEI. The leaching
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Damage mechanism and fracture evolution of rock containing defects with LCEM-GFEM method under explosive load J. Cent. South Univ. (IF 4.4) Pub Date : 2024-03-25 Yong Chen, Ying-peng Wang, Yu-gui Yang, Wen-kai Sun, Ning-kang Meng
Defects in rock masses have significant influence on the fracture propagation during blasting. In this study, a numerical model is developed using the local cohesive element based on the global finite element method (LCEM-GFEM) to simulate the damage evolution and fracturing pattern of rock mass with defects under blasting load. The influence of defect morphology on the stress wave transmission and
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Microstructure and hot corrosion properties of an Al-Y coating on TiAl alloy J. Cent. South Univ. (IF 4.4) Pub Date : 2024-03-25 Yong-quan Li, Qing-rui Hao, Guo-dong Liang, Guang-jun Liu, Shu-jing Liu
To improve the hot corrosion performance of TiAl alloys, an Al-Y coating was prepared by a pack cementation process. The effect of catalysts on the structure of the Al-Y coating and its thermal shock resistance was studied. The thermal corrosion performance of both the TiAl alloy and the coating in a mixed molten salt system of 25% NaCl+75% Na2SO4 (wt.%) was comparatively investigated. The results
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A multilayered microwave absorbing composite structure enhanced by fiberglass enforced epoxy laminate array J. Cent. South Univ. (IF 4.4) Pub Date : 2024-03-25 Zhe-yi-pei Ma, Jia-le Li, Chao Jiang
A multilayered composite structure with ultra-wideband and strong microwave absorbing performance has been developed, which is prepared through vacuum bag molding process, and the fiberglass enforced epoxy laminate (FEPL) array on its surface is fabricated by computer numerical control (CNC) carving method. The surface density of the whole composite structure with FEPL array is about 2.4 kg/m2, and
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Optimization of the microstructure, mechanical properties, and wear resistance of nacre-inspired TiB2/Al-Cu composites via gelatin addition J. Cent. South Univ. (IF 4.4) Pub Date : 2024-03-25 Ya-li Chen, Bo Lin, Meng Nie, Ke Hu, Hua-qiang Xiao
Nacre-inspired TiB2/Al-Cu composites were prepared by freeze casting and squeeze casting. This study focused on the effect of gelatin content on microstructure, mechanical characteristics, and wear resistance of the composites. The structure formation, as well as the fracture and wear mechanisms of the composites, was analyzed. The results demonstrate that both the compressive and bending strength
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Deterioration of compressive properties of coal rocks under water and gas coupling J. Cent. South Univ. (IF 4.4) Pub Date : 2024-03-25 Ke Lyu, Ning Jiang, Da-wei Yin, Shu-yu Meng, Zhi-you Gao, Tao Lyu
The compressive properties of coal under water-gas coupling were studied based on the water-rock-gas coupling test system. The compressive strength and deformation damage characteristics of the coal samples were analyzed, and the macro and fine degradation mechanisms of coal under water-gas coupling were revealed. The compressive strength of the coal samples under the three soaking conditions was reduced
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3,3′-dithiodipropionic acid as a functional electrolyte additive in lithium-sulfur battery J. Cent. South Univ. (IF 4.4) Pub Date : 2024-03-25 Shi-yu Shao, Liang He, Ji-wei Zhang, Si-min Li, Bo Hong, Kai Zhang, Jie Li
High-energy-density lithium-sulfur (Li-S) batteries are among the most promising energy storage devices, but their potential has been constrained by the shuttle effect and poor active material utilization. Here, 3,3′-dithiodipropionic acid (DTPA), an efficient electrolyte additive, is applied to Li-S batteries while its underlying mechanism on the electrochemical performance is examined. The results
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Characteristics of work hardening and constitutive models comparison of powder metallurgy Al-5.6Zn-2Mg alloy during hot compression J. Cent. South Univ. (IF 4.4) Pub Date : 2024-03-25 Harikrishna Katika, R. K. Damoda, M. J. Davidson, R. Seetharam, Veera Venkata Nagaraju Kasagani
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Removal of arsenic from arsenic-containing solution in a three-dimensional electrode reactor J. Cent. South Univ. (IF 4.4) Pub Date : 2024-03-25 Yong-jian Luo, Yun-yan Wang, Zi-tong He, Huan Xu, Zhu-mei Sun
Deep treatment, a method for further reducing the content of a target substance, for toxic arsenic (As) from water is vital to reduce environmental pollution and ensure human health. Here, we employed electrosorption of As(V) from water in a self-made three-dimensional reactor with granular activated carbon (GAC). The As(V) concentration can be decreased from 0.5 to 0.032 mg/L under optimal conditions
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Enhanced mechanical stability and corrosion resistance of superhydrophobic coating reinforced with inorganic binder J. Cent. South Univ. (IF 4.4) Pub Date : 2024-02-07 Li-xia Zhao, Hong-yan Li, Kun Zhou, Hai-xing Liu, Jian Wang, Bin-bin Zhang
The development of superhydrophobic materials have demonstrated significant potential in the realm of corrosion protection for aluminum alloy (Al alloy) surfaces. However, the limited mechanical stability of superhydrophobic surfaces has impeded the rapid advancement in this field. In this research, we synthesized an aluminum phosphate (AP) inorganic binder and combined it with hydrophobic fumed SiO2
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Effect of Sm content on microstructure and properties of extruded Mg-6Al-2Sr alloy J. Cent. South Univ. (IF 4.4) Pub Date : 2024-02-07 Hong-xu Liu, Cai-xia Li, Jin-long Xie, Chao Li, Xiao-hua Zhang
In this paper, the strengthening mechanism of different Sm content on extruded Mg-6Al-2Sr alloy was studied. The microstructure was observed by metallographic experiment, X-ray diffraction, scanning electron microscopy and transmission electron microscopy, and the effect of Sm content on the microstructure of the alloy was analyzed by EBSD. The main experiment in this paper is the extrusion experiment
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Fluid-solid interaction analysis of blood flow in the atherosclerotic carotid artery using the Eulerian-Lagrangian approach J. Cent. South Univ. (IF 4.4) Pub Date : 2024-02-07 Majid Siavashi, Ava Bina, Mojtaba Sayadnejad, Borhan Beigzadeh
This study aims to simulate pulsatile blood flow in the carotid artery with different stenosis severities and pulse rates. The effects of different severities of stenosis, pulse rates, and arterial wall properties on the surrounding fluid are investigated by using fluid-structure interaction (FSI) and arbitrary Lagrangian-Eulerian (ALE) methods. Carreau-Yasuda non-Newtonian and modified Mooney-Rivin
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Preparation and properties of double-template magnetic molecularly imprinted polymers for removal of nitrophenol from drinking water J. Cent. South Univ. (IF 4.4) Pub Date : 2024-02-07 Yi-wen Ouyang, Jian-jun Liang, Xiao-feng Gao
In order to efficiently remove 4-nitrophenol (4-NP) and 2,4-dinitrophenol (2,4-DNP), 4-NP and 2,4-DNP were used as template molecules and double-template magnetic molecularly imprinted polymers (D-MIPs) were prepared by surface molecular imprinting technology using itaconic acid as functional monomer, Fe3O4@SiO2 as carrier, ethylene glycol dimethacrylate as crosslinking agent and azodiisobutyronitrile
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Longitudinal and cross-sectional partitioned failure mechanism of tunnels subjected to stick-slip action of strike-slip faults J. Cent. South Univ. (IF 4.4) Pub Date : 2024-02-07 Heng-hong Yang, Ming-nian Wang, Xun Luo, Li Yu, Xiao Zhang, Lang-zhou Tang
Permanent displacement occurs in strike-slip faults due to stick-slip action, causing significant damage and distinct partitioning features in tunnels intersecting these faults. To elucidate the longitudinal and cross-sectional partitioned failure mechanism of tunnels and provide seismic design support for tunnels intersecting active faults, we investigated several seismic damage examples to summarize
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Strength and failure characteristics of coal measures mudstone specimens containing a prefabricated flaw under true triaxial tests J. Cent. South Univ. (IF 4.4) Pub Date : 2024-02-07 Wen-shuai Li, Bang-you Jiang, Zhao-lin Li, Lian-guo Wang, Xu-xu Yang
In this study, a series of coal measures mudstone specimens containing a prefabricated flaw were subjected to true triaxial test (TTT), namely, specimens of the intermediate principal stress (σ2) parallel to prefabricated flaw (TTT-Flaw-2) and specimens of the minimum principal stress (σ3) parallel to prefabricated flaw (TTT-Flaw-3). The main objective of this study was to investigate the effects of
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Regulation mechanism of aging behavior and mechanical properties of 2195-T34 Al-Li alloy at different stress levels J. Cent. South Univ. (IF 4.4) Pub Date : 2024-02-07 Fei Chen, Li-hua Zhan, Yong-qian Xu, Chun-hui Liu, Bo-lin Ma, Quan-qing Zeng, Zheng-gen Hu, Wen-li Zhu, Dong-yang Yan
The effect of aging on the mechanical properties of the 2195-T34 Al−Li alloy at different stress levels was investigated. When the stress was below the high-temperature yield strength (YS), the YS and elongation (EL) of the low-stress aged (LSA) and stress-free aged (SFA) specimens were similar. When the stress exceeded the high-temperature YS, the ultimate tensile stress (UTS) and EL of the specimens
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Strengthening mechanism of steel fiber in UHPC: A new fracture phase field model J. Cent. South Univ. (IF 4.4) Pub Date : 2024-02-07 Bing Zhao, Xian-zheng Li, Jun Pan, Hui Peng, Xu-long Peng, Zhen-hao Zhang, Zhan-ping Song, Mo-yu Zhao
The engineering optimization of ultra-high strength concrete (UHPC) requires urgent exploration of the strengthening mechanism of steel fiber in UHPC and the establishment of an effective simulation model. In this study, we propose a new fracture phase field model that considers the fracture energy of the interface between steel fiber and UHPC matrix. The model is utilized to conduct uniaxial tensile
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Interface characteristics and mechanical properties of titanium/aluminum composites with an interlayer fabricated by explosive welding J. Cent. South Univ. (IF 4.4) Pub Date : 2024-02-07 Jia-xin Yuan, Fei Shao, Lin-yue Bai, Hong-wei Zhang, Qian Xu, Lei Gao, Xing-kun Xie, Yu Pan
In this work, the interface morphology and element distribution of the TC1/AA1060/AA6061 composite plate were studied. The grain information was investigated by electron backscattered diffraction and interface temperature was obtained by numerical simulation to explain the grain information. The experimental samples were tested by mechanical methods. The results show that the TC1/AA1060/AA6061 composite
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Effect of preform structure on mechanical and thermal properties of SiCf/SiC composites J. Cent. South Univ. (IF 4.4) Pub Date : 2024-02-07 Xu-hui Wang, Zong-xu Wu, Zhao-ke Chen, Yan Wu, Xiang Xiong
In this paper, SiCf/SiC composites with three kinds of preform structures, namely 2D multilayered, 3D angle-interlock and multiaxis 3D braided, were prepared by chemical vapor infiltration. The influences of preform structure on mechanical and thermal properties of SiCf/SiC composites were discussed in detail, on the basis of comprehensive analyses of fiber arrangement, SiC matrix and pore distribution
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Heterocoagulation mechanism between galena and fine calcite minerals in flotation separation J. Cent. South Univ. (IF 4.4) Pub Date : 2024-02-07 Rui-kang Wang, Zhuo-yue Lan, Dong-xia Feng, Qing-ping Zhao, Di Yang, Xiong Tong
Heterocoagulation between fine particles can interfere with the flotation separation of different minerals. Therefore, the study of particle heterocoagulation is significant. This study found that fine calcite affected galena flotation and examined the interactions between galena and fine calcite particles in suspension pulp. The best flotation behaviour was observed for pure galena minerals at pH
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Preparation and characterization of high hard and high tough ultrafine WC ceramics containing hybrid graphene and SiC nanowire J. Cent. South Univ. (IF 4.4) Pub Date : 2024-02-07 Xue-hui Shen, Nan Xu, Hao Su, Xiang-ping He, Jian-qun He
The aggregation of low-dimensional nanofillers in the host ceramic matrix significantly discounted their reinforcing efficiency. Herein, employing two-dimensional graphene (G) and one-dimensional SiC nanowire (SiCnw), WC-G-SiCnw ceramic composites were prepared through spark plasma sintering. The effects of sintering temperature, soaking time and pressure on the mechanical properties of the WC-based
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Dynamic modulus and damping ratio characteristics of unsaturated silt in the Yellow River flood field J. Cent. South Univ. (IF 4.4) Pub Date : 2024-02-07 Fei Peng, Meng-yao Li, Yong-hui Li, Mao-song Huang
The silt in the Yellow River flood field exhibits strong water sensitivity and unique mechanical properties, which makes it vulnerable to vibration load. This study investigates the dynamic elastic modulus and damping ratio characteristics of the silt by considering the influence of confining pressure and saturation through dynamic triaxial tests. Test results indicate that the backbone curves of the
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An efficient parallel computing method for random vibration analysis of a three-dimensional train-track-soil coupled model using Seed-PCG algorithm J. Cent. South Univ. (IF 4.4) Pub Date : 2024-02-07 Zhi-hui Zhu, Yang Feng, Xiao Yang, Hao Li, You Zou
This study proposes an efficient parallel computation method based on Seed-preconditioned Conjugate Gradient (Seed-PCG) algorithm, to address the issue of computational inefficiency of random multi-sample in three-dimensional (3D) finite element (FE) model of train-track-soil. A 3D train-track-soil coupled random vibration analysis model is established using the finite element method (FEM) and the
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Quantitative characterization of water absorption pore structure evolution in sandstone based on nitrogen adsorption and mercury intrusion J. Cent. South Univ. (IF 4.4) Pub Date : 2024-02-07 Xiao-ming Sun, Jia-xu Ding, Lin-sen He, Fun-kun Shi, Cheng-yu Miao, Yong Zhang, Ming-qun Zhu, Jin-kun Yang, Cheng Xie
To investigate the mechanism of water’s effect on the pore structure of rocks, this study relies on the sandstone formation in Wanfu Coal Mine, Shandong, China. Scanning electron microscopy (SEM), nitrogen adsorption-desorption, and high-pressure mercury intrusion combined with pore structure testing experiments were conducted on sandstone samples subjected to different immersion times. The aim was
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Experimental study on microscopic characteristics of liquid-cooled granite based on mercury injection method J. Cent. South Univ. (IF 4.4) Pub Date : 2024-02-07 Tu-bing Yin, Ju-zhen Su, Deng-deng Zhuang, Xi-bing Li
To study the effect of liquid cooling, including acid cooling and water cooling, on the microscopic characteristics of high-temperature granite, scanning electron microscopy and energy spectroscopy analysis tests (SEM-EDS) as well as mercury injection experiments were carried out on liquid-cooled granite. The SEM-EDS results show that the elemental composition is barely affected by water cooling, while
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Crack generation, propagation mechanism and thermal property of Zn-coated hot stamping steel J. Cent. South Univ. (IF 4.4) Pub Date : 2024-02-01
Abstract In this study, the Gleeble tests and hot stamping of practical part of Zn-coated hot stamping steel were conducted. Based on the analysis of thermal properties, a material model was employed to fit the relationship between true stress and true strain with high accuracy. The effect of forming temperature, ferrite formation and bending on the liquid metal induce embrittlement (LMIE) was researched
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Variation of humic carbon and microbial communities in bauxite residue following co-application of straw and phosphogypsum J. Cent. South Univ. (IF 4.4) Pub Date : 2024-02-01
Abstract Humification is one of the critical processes in the ecological restoration of bauxite residue deposit areas. Straw addition is widely used strategy to increase organic carbon in bauxite residue. However, the effect of straw application on the humic carbon fractions in bauxite residue is largely unknown. In this study, the accumulation of humic fractions and associated microbial communities
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Vibration analysis of a gear-rotor-bearing system with outer-ring spalling and misalignment J. Cent. South Univ. (IF 4.4) Pub Date : 2024-02-01
Abstract Misalignment and spalling of bearing rings are typical errors and faults that significantly influence the vibration characteristics of a gear-rotor-bearing system. In order to investigate the coupling effects of misalignment and spalling, it is necessary to analyze the vibration characteristics of a gear-rotor-bearing system with misalignment and spalling. Firstly, considering the outer ring
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Ground settlement caused by pipe-roof pre-construction method: Effect of the sequence of jacking pipe groups J. Cent. South Univ. (IF 4.4) Pub Date : 2024-02-01
Abstract Based on the Taiyuan Railway Station underpass tunnel project, the influence of construction process of closed pipe-roof pre-construction structures on the ground settlement was investigated. Numerical simulations were used firstly to analyze the ground settlement characteristics caused by three types of different jacking pipe sequences, i. e., from top to bottom, simultaneous construction
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Analysis of incompressible viscous fluid flow in convergent and divergent channels with a hybrid meta-heuristic optimization techniques in ANN: An intelligent approach J. Cent. South Univ. (IF 4.4) Pub Date : 2024-01-21 Muhammad Naeem Aslam, Arshad Riaz, Nadeem Shaukat, Shahzad Ali, Safia Akram, M. M. Bhatti
In this research article, we introduce a numerical investigation through artificial neural networks (ANN) integrated with evolutionary algorithm especially Archimedean optimization algorithm (AOA) hybrid with the water cycle algorithm (WCA) to address and enhance the analysis of the non-linear magneto-hydrodynamic (MHD) Jeffery-Hamel problem, especially stretching/shrinking in convergent and divergent
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Numerical analysis of building structures response under effect of continuous and stepped non-uniform settlement J. Cent. South Univ. (IF 4.4) Pub Date : 2024-01-21 Chen-jiang Jiao, Shuang You, Hong-guang Ji
The occurrence of non-uniform building settlement and mine-induced earthquakes are common in areas with frequent mining activities. This phenomenon can be attributed to soil deformation and redistribution of internal forces resulting from mining activities, which often leads to significant damage to building structures. The long-term deformation of the slope of an open-pit mine after closure contributes
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Strength prediction and drillability identification for rock based on measurement while drilling parameters J. Cent. South Univ. (IF 4.4) Pub Date : 2024-01-21 Shao-feng Wang, Yu-meng Wu, Xin Cai, Zi-long Zhou
Rapid acquisition of rock mechanical parameters and accurate identification of rock drillability are important to guide the safe construction of different scale drilling engineering (wells and boreholes) and high-efficient excavation of rock engineering. A database is established based on 281 sets of drilling parameters and rock mechanical parameters collected from four micro drilling experiments.
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Stiffness theory of rockburst: Research progress and trends J. Cent. South Univ. (IF 4.4) Pub Date : 2024-01-21 Ya-xun Xiao, Rong-ji Wan, Guang-liang Feng, Tong-bin Zhao, Yan-chun Yin
The stiffness theory of rockburst plays a crucial role in understanding and preventing rockburst events. This theory evaluates the severity of rockbursts through the difference in stiffness. As a fundamental theory, many new theories have emerged from the stiffness theory, and its applications in mines and deep tunnels are diverse. In this paper, we provide a systematic review of the development process
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Persistent activation of peroxymonosulfate by MoS2@FeOOH/ceramsite composite for continuous flow degradation of sulfamethoxazole J. Cent. South Univ. (IF 4.4) Pub Date : 2024-01-21 Lin Peng, Chun-quan Li, Xin-chao Zhang, Fang Yuan, Shi-xuan Wang, Jian-bing Wang, Long-hua Xu, Zhi-ming Sun
Within the realm of wastewater treatment, the restrictions of inter-particle agglomeration and difficulty in recovery of traditional powder materials greatly limited their large-scale application. Hence, a novel combination of hydrothermal method and impregnation enabled the successful loading of MoS2@FeOOH (MF) onto solid waste-derived ceramsite. Then it was employed to remove sulfamethoxazole (SMX)
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Selective leaching of nickel and cobalt from sintered nickel alloy by oxygen pressure acid leaching process J. Cent. South Univ. (IF 4.4) Pub Date : 2024-01-21 Yong-wei Wang, Xue-jie Chang, Yu-he Cheng, Wen-qing Qin, Jun-wei Han
In this work, oxygen pressure acid leaching is implemented to augment the leaching efficiency of valuable metals from sintered nickel alloy. Techniques investigation shows that NiO in the sample and NiO coated by Ni2O3 impede the ongoing dissolution of nickel during atmospheric acid leaching. The nickel oxides undergo conversion into soluble nickel sulfate via oxygen pressure acid leaching. Thermodynamic