摘要：
Concrete-filled round-ended steel tubes (CFRTs) are a unique type of composite stub columns, which have the advantage of aesthetics and a well-distributed major-minor axis. Thus, the structure has been widely employed as piers and columns in bridges. To improve the mechanical performance of CFRTs with a large length-width ratio and to enhance the restraint effect of steel tubes on concrete, this study investigates the compressive property of multi-chamber, concrete-filled, round-ended steel tubular (M-CFRT) stub columns using a combination of experimental and numerical analyses. A detailed compression test on eight specimens is conducted to examine the compressive property of M-CFRT stub columns. The study focuses on understanding the influence of some key parameters on ultimate bearing capacity, failure stage, damage modes, and ductility. Additionally, the accuracy of the finite element modeling method in simulating the ultimate bearing capacity of the structure is verified. Finally, the calculating formula for the ultimate bearing capacity of M-CFRT stub columns is proposed on the basis of the experimental and numerical findings. Results of the formula calculation are consistent with the experimental data. These research findings serve as a valuable reference for designing similar structures in engineering practice.
摘要：
Corrosion accelerates the propagation of fatigue damage and significantly reduces the fatigue life of the orthotropic steel bridge deck (OSBD). This paper experimentally investigates the effects of local corrosion on the fatigue behavior of rib -to -deck (RD) joints in OSBDs. Firstly, an accelerated corrosion test was conducted to obtain corrosive effects for various corroded RD joint specimens. Next, the 3D scanning technology was used to test the geometric characteristics of corrosion regions. Then, the strain, failure mode, crack growth, and fatigue performance of corroded RD joints subjected to various fatigue cycles are discussed based on the fatigue loading test. Finally, a three-dimensional solid model of RD joint was established utilizing ABAQUS-FRANC3D (F -A) technology to analyze fatigue crack stress intensity factors (SIFs). The results indicated that corrosion has the greatest impact on the strain of the top plate weld toe, followed by the top plate weld root, with the least impact on the U -rib weld toe. The crack initiation life of specimens with a corrosion rate of 10.81%, 20.47%, and 30.14% decreased by 24.24%, 30.30%, and 60.61%, respectively, and the crack propagation life decreased by 2.11%, 21.05%, and 78.95%, respectively. The fatigue crack propagation of locally corroded RD joint is jointly controlled by type I, II, and III SIFs, and belongs to a composite fatigue crack dominated by type I cracking. The SIF at the welding toe of the top plate during U -rib bottom plate corrosion is greater than that of the top plate corrosion. The effects of the initial crack shape ratio and deflection angle on the SIF increase as the corrosion rate increases.
摘要：
A novel bilayer porous resin with micropore filling and anion exchange (PsCH2BP) was synthesized. The aim was to investigate the adsorption of sulfadiazine on PsCH2BP. The micropore area of PsCH2BP was reduced by 73.91 % after the adsorption of sulfadiazine. PsCH2BP exhibited the synergism of micropore filling and anion exchange in the adsorption of sulfadiazine. Within the pH range of 7.29-13.31, the adsorption capacity trend of sulfadiazine on PsCH2BP was consistent with its ionization curve of pka 6.48. The adsorption of sulfadiazine on PsCH2BP was endothermic, spontaneous, entropy increase and heterogeneous multilayer adsorption, reflecting the bilayer pore structure of PsCH2BP. 100 % C2H5OH and 4 % NaCl could desorb 75.13 % and 65.06 % of sulfadiazine adsorbed on PsCH2BP, respectively, reflecting the synergism of the micropore filling and anion exchange in the adsorption of sulfadiazine on PsCH2BP. 100 % of desorption ratio of sulfadiazine adsorbed by PsCH2BP was achieved with 4 mol/LNaOH.
期刊：
Structure and Infrastructure Engineering,2024年 ISSN：1573-2479
通讯作者：
Zhang, ZH
作者机构：
[Zhang, Zaihua; Mao, Guangxiang] Hunan City Univ, Civil Engn Coll, Yiyang, Peoples R China.;[Zhang, Zaihua] Hunan City Univ, Network Ctr, Yiyang, Peoples R China.;[Luo, Wei; Chen, Guangfei] Xiangtan Univ, Civil Engn Coll, Xiangtan, Peoples R China.;[Zhang, Zaihua; Zhang, ZH] Hunan City Univ, Civil Engn Coll, Yingbin Rd 518, Yiyang, Hunan, Peoples R China.
通讯机构：
[Zhang, ZH ] H;Hunan City Univ, Civil Engn Coll, Yingbin Rd 518, Yiyang, Hunan, Peoples R China.
关键词：
Composite joint;failure form;finite element analysis;hysteresis performance;quasi-static experiment;ribbed angle steel
摘要：
For the composite frame structure of concrete column and steel beam, a connection structure based on ribbed angle steel connector (RASC) is proposed, and the hysteresis performance and force transmission mechanism of this new type of composite joint are studied. Through quasi-static experimental research, the influence of beam and column cross-sectional dimensions on the bearing capacity, energy dissipation capacity, stiffness degradation, ductility, and failure form of the frame structure was analyzed. The results of experimental and finite element analysis show that the failure forms of this joint under low-cycle repeated loading are mainly manifested as the shear failure of concrete in the core area of beams and columns and sliding failure between angle steel connectors and steel beams, and the hysteresis curves of the joints are similar to those of frame beams and columns, respectively.
作者机构：
[Qing, Xiangdong] Hunan Provincial Key Laboratory of Dark Tea and Jin-hua, College of Materials and Chemical Engineering, Hunan City University, Yiyang, 413000, PR China. Electronic address: xdqing123@hnu.edu.cn;[Lu, Guiying] National Center of Dark Tea Product Quality Inspection and Testing, Yiyang Testing Institute of Product and Commodity Quality Supervision, Yiyang, 413000, PR China;[Zhang, Xiaohua] Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang, 414006, PR China;[Chen, Qingling] Analytical Instrumentation Center of Hunan University, Changsha, 410082, PR China;[Zhou, Xiaohong; Xu, Ling; He, Wei] Hunan Provincial Key Laboratory of Dark Tea and Jin-hua, College of Materials and Chemical Engineering, Hunan City University, Yiyang, 413000, PR China
通讯机构：
[Qing, Xiangdong; Zhang, Jin] H;Hunan Provincial Key Laboratory of Dark Tea and Jin-hua, College of Materials and Chemical Engineering, Hunan City University, Yiyang, 413000, PR China. Electronic address:
摘要：
Classifying big data in hyperspectral imaging (HSI) can be challenging when minor (low-concentrated) compounds are present in actual samples, as for chemical additives and adulterants in food matrix. Herein, we propose a new strategy to classify HSI data for the identification of adulterants in food material for the first time. This strategy is based on the selection of essential spectral pixels of full HSI data followed by the feature space construction using uniform manifold approximation and projection as well as the data clustering utilizing hierarchical clustering analysis on the reduced data (named ESPs-UMAP-HCA). We apply our approach to analyze two real NIR datasets and four new Raman datasets. Compared with non-ESPs UMAP-HCA and t-distributed stochastic neighbor embedding combined with ESPs and HCA (ESPs-t-SNE-HCA), the developed strategy provides well-separated clusters for major and minor compounds in food matrix. Finally, the adulterants as minor compounds are accurately identified, which is confirmed by the fact that the extracted spectra of them perfectly match with their pure spectra. In addition, their locations are found in the contribution map even though they are present in a few pixels. What's more, the proposed strategy does not need any a priori knowledge of the data structure and the class memberships and therefore reduced the studied difficulty and confirmation bias in the analysis of big HSI datasets. Overall, the proposed ESPs-UMAP-HCA method could be a potential approach for food adulteration detection.
期刊：
International Journal of Networking and Virtual Organisations,2024年29(3-4):386-399 ISSN：1470-9503
作者机构：
[Aihua Mo] School of Management, Hunan City University, Hunan, 413000, China
关键词：
the era of social media;electronic commerce;purchase intention prediction;minimum hash;Bayesian personalised sorting method
摘要：
The research goal is to improve the AUC value and R2 value of the prediction results and reduce the average absolute error and propose a prediction method of e-commerce consumers' purchase intention in the era of social media. Firstly, linear transformation is performed on the historical purchasing data of consumers, and the importance of the data is determined through thresholds. Based on the judgment results, the data is dimensionally reduced. Secondly, the minimum hash algorithm is used to calculate the similarity between the dimensionality reduced data, and the fuzzy clustering decision method is used to classify historical purchase data. Finally, the Bayesian personalised sorting method is used to predict the purchase intention. The experimental results show that the AUC value and R2 value of the proposed method are large, and the average absolute error is low, indicates that the prediction effect of this method is good.
作者：
Chen, Y. J.;Tang, J. X.;Pang, Z.;Yuan, C.;Yue, T. M.
期刊：
Journal of Manufacturing Processes,2024年112:263-272 ISSN：1526-6125
通讯作者：
Chen, Y
作者机构：
[Chen, Y. J.; Chen, Y; Tang, J. X.; Pang, Z.] Dongguan Univ Technol, Dept Mech Engn, Dongguan 523808, Peoples R China.;[Yuan, C.] Hunan City Univ, Coll Mech & Elect Engn, Yiyang 413000, Peoples R China.;[Yue, T. M.] Hong Kong Polytech Univ, Dept Ind & Syst Engn, Adv Mfg Technol Res Ctr, Hong Kong, Peoples R China.
通讯机构：
[Chen, Y ] D;Dongguan Univ Technol, Dept Mech Engn, Dongguan 523808, Peoples R China.
摘要：
The current challenge in laser joining polymer and ceramic heterogeneous structures lies in their relatively low mechanical strength, primarily attributed to weak interface bonding. To address this issue, this paper proposes the application of ultrasonic vibration during the laser joining process of PET with both Si3N4 and Ti-coated Si3N4 sheets to enhance the interface bonding strength. Investigating the mechanisms underlying the enhancement of interface bonding strength due to ultrasonic vibration is crucial for improving the overall mechanical strength of the joints. It is found that the physical wetting thermodynamic conditions and chemical bond thermodynamic conditions for laser joining of PET to ceramics were the surface tension of ceramics higher than that of the molten PET and the variation in the Gibbs function less than -24.3 kcal/mol, respectively. Experimental results demonstrated that the bonding interface between Si3N4 sheet and PET exhibits only physical and mechanical bonding, with no evidence of new chemical bonds. However, XPS analysis detected new Ti-C bonds at the bonding interface of Ti-coated Si3N4 and PET. Furthermore, experimental results substantiated that ultrasonic vibration could improve the spreading wetting of PET melt on the Si3N4 surface, resulting in a 17 % increase in the bonded area of the weld seam. Additionally, ultrasonic vibration enhanced the molten PET filling into the blind hole structure on the Si3N4 surface, resulting in an approximately 73 % increase in the filling depth of the blind holes. Lastly, ultrasonic vibration facilitated the chemical reaction between the molten PET and Ti atoms, resulting in an approximately 57 % increase in the thickness of the interface containing Ti-C bonds. It is evident that ultrasonic vibration can bolster the interfacial bonding strength of PET/Si3N4 and PET/Ti-coated Si3N4 in laser joining. Moreover, in comparison to physical bonding, its more pronounced impact on mechanical and chemical bonding is noteworthy.
摘要：
Reinforced concrete bridge piers with round-ended sections are susceptible to bending, bending-shear, and shear failure after earthquakes in high-intensity areas, thus necessitating improved seismic performance. This study introduced a novel design for a concrete-filled steel tube (CFST) column, featuring a multi-chambered, round-ended cross-section. The use of longitudinal and transverse stiffeners divided the column section into distinct chambers, thereby enhancing the seismic performance of the columns. A total of 12 groups of static tests were performed to examine the effect of chamber layout, axial compression ratio, and aspect ratio on columns' hysteresis behavior, and the hysteresis curves, skeleton curves, failure modes, stiffness degradation, ductility, and energy dissipation capacity were obtained. Results demonstrated the favorable seismic performance of composite columns. Additionally, an increase in chambers led to a full hysteresis curve, enhancing bearing and energy dissipation capacities. The displacement ductility coefficient (mu) ranged between 3.88 and 7.45, and the design parameters have minimal influence on the stiffness degradation of the composite beam. Based on the results, the long and short sides of the CFST columns with a large length-width ratio should be arranged to be relatively close in length.
关键词：
Furnace atomic absorption spectrometer;immobilized p-dimethylaminobenzylidenerhodanine;separation and preconcentration;TiO2 nanoparticles;trace thallium
摘要：
The novelty of immobilized p-dimethylaminobenzylidenerhodanine is successfully prepared by using TiO2-based nanoparticles as the carrier. It is applied to preconcentrate and separate trace thallium and detect by flow injection combined with graphite furnace atomic absorption spectrometer. The results show that immobilized p-dimethylaminobenzylidenerhodanine can preconcentrate and separate trace thallium and eliminate the interference of many other ions. The optimal adsorption occurs at pH = 3.5, the retention time is 2.0 min, and the flow velocity is 2.5mL/min. The optimal desorption takes place at a flow velocity of 1.0 mL/min, 1 mL mixed solution (thiourea and HCl were both 0.1 mol/L). The recovery rate of thallium is over 95%; the amount of immobilized p-dimethylaminobenzylidenerhodanine is 22.08 mg/g; the adsorption capacity of thallium for immobilized p-dimethylaminobenzylidenerhodanine is 7.2 mg/g; the molar ratio of thallium ions and p-dimethylaminobenzylidenerhodanine is 5:2. The immobilized p-dimethylaminobenzylidenerhodanine can be recycled and reused. For the developed method, the limit of detection is 8 ng/L, the relative standard deviation is 3.7%, and the recovery is 89%–107%. The method is successfully applied to actual samples with satisfactory results.
作者机构：
[Liu, Bangfu; Liu, BF] Hunan Elect Informat Ind Inst, Jiefangdonglu 51, Changsha 410000, Hunan, Peoples R China.;[Zhou, Le-zhou] Hunan Prevent & Treatment Inst Occupat Dis, Changsha 410007, Hunan, Peoples R China.;[He, Guo-wen] Hunan City Univ, Coll Mat & Chem Engn, Yiyang 413000, Hunan, Peoples R China.;[Wang, Chaoli] Air Force Mil Med Univ, Dept Pharm, Xian 710000, Shanxii, Peoples R China.
通讯机构：
[Liu, BF ] H;Hunan Elect Informat Ind Inst, Jiefangdonglu 51, Changsha 410000, Hunan, Peoples R China.
关键词：
Hydrophobic deep eutectic solvents;Stripping back extraction;Complexation;Metal ions;Three-phase separation
摘要：
In this paper, a green hydrophobic deep eutectic solvent (HDES) composed of menthol and hexanoic acid was employed to dissolve cosmetics containing Cd2+ and Cd2+ was extracted using an EDTA-2Na saturated solution, analyzed by FAAS. The study found that HDES-1 can be recycled and reused well; the stability constants of Cd2+ EDTA chelates play an important role in the extracting process; the optimum conditions were: the solubility of HDES-1 was 20 mL/g for cosmetic sample at an indoor temperature of around 10 degrees C; the dissolver-extractant ratio was 2:1; the LOD was 0.037 mg/kg; the RSD was 3.5%; and the recovery was 85.5-118.3%. The developed method was successfully applied to actual cosmetic samples with satisfactory results, and it was also applied for the determination of Mg2+, Mn2+, and Cu2+ in cosmetic samples.
摘要：
This review provides an overview of the current trends and prospects of the extraction and separation analysis techniques for phenolic compounds in honey in 2012-2022 years. The classification, chemical structures, physicochemical, and bioactive properties of phenolic compounds in honey were comprehensively analyzed. The recent sample preparation techniques for extracting and separating the phenolic compounds from honey were discussed. The advantages and disadvantages of different extraction and separation analyses were also analyzed and compared. According to recent literatures, solid phase extraction and liquid-liquid extraction, two traditional sample preparation techniques, are still widely used for extracting phenolic compounds from honey samples. Various improved microscale extraction methods, such as solid phase microextraction and liquid-liquid microextraction, and sub-technologies can be applied considering the recovery rates, costs, solvent consumption, and environmental impacts. This review will provide insights into the extraction and separation analysis of phenolic compounds, and foster the development and utilization of active components in honey.
期刊：
Advances in Civil Engineering,2023年2023 ISSN：1687-8086
通讯作者：
Wang, YK
作者机构：
[Wang, YK; Wang, Yukui; Zhang, Dan] Hunan City Univ, Hunan Engn Res Ctr Dev & Applicat Ceramsite Concre, Yiyang 413099, Peoples R China.;[Yan, Shijun] Hunan City Univ, Coll Mech & Elect Engn, Yiyang 413000, Peoples R China.;[Zhang, Dan] Hunan City Univ, Key Lab Green Bldg & Intelligent Construct Higher, Yiyang 413000, Peoples R China.;[Hu, Zhangqi] Hunan City Univ, Coll Civil Engn, Yiyang 413099, Peoples R China.
通讯机构：
[Wang, YK ] H;Hunan City Univ, Hunan Engn Res Ctr Dev & Applicat Ceramsite Concre, Yiyang 413099, Peoples R China.
关键词：
Introduction;Materials and Methods;Results;Discussion;Conclusion;Abstract;Data Availability;Additional Points;Ethical Approval;Consent;Disclosure;Conflicts of Interests;Authors’ Contributions;Funding Statement;Acknowledgements;Acknowledgments;Supplementary Materials;Reference;Dataset Description;Dataset Files;Abstract;Introduction;Introduction and Materials;Introduction and Methods;Materials;Materials and Methods;Methods;Results;Discussion;Results and Discussion;Discussion and Conclusion;Results and Conclusion;Conclusion;Conclusions;Data Availability;Additional Points;Ethical Approval;Consent;Disclosure;Conflicts of Interest;Authors’ Contributions;Funding Statement;Acknowledgements;Supplementary Materials;References;Appendix;Abbreviations;Preliminaries;Introduction and Preliminaries;Notation;Proof of Theorem;Proofs;Analysis of Results;Examples;Numerical Example;Applications;Numerical Simulation;Model;Model Formulation;Systematic Palaeontology;Nomenclatural Acts;Taxonomic Implications;Experimental;Synthesis;Overview;Characterization;Background;Experimental;Theories;Calculations;Model Verification;Model Implementation;Geographic location;Study Area;Geological setting;Data Collection;Field Testing;Data and Sampling;Dataset;Literature Review;Related Works;Related Work;System Model;Methods and Data;Experimental Results;Results and Analysis;Evaluation;Implementation;Case Presentation;Case Report;Search Terms;Case Description;Case Series;Background;Limitations;Additional Points;Case;Case 1;Case 2 etc.;Concern Details;Retraction Details;Copyright;Related Articles
摘要：
The research group utilized the estimation model of energy consumption capacity for reinforced concrete components without axial force to assess the energy consumption capacity of 92-reinforced concrete components from the PEER database, which were subjected to axial force and bending. The study also examined the impact of design parameters, including longitudinal reinforcement ratio, transverse reinforcement ratio, axial compression ratio, and shear-span ratio, on the estimation results. The research findings revealed that when applying the estimation model of energy consumption capacity for reinforced concrete components without axial force to calculate the energy consumption capacity of reinforced concrete components with axial force, there was a significant deviation rate in the estimation of cumulative energy consumption. The relationship between the deviation rate of cumulative energy consumption and longitudinal reinforcement ratio, axial compression ratio, and shear-span ratio remained unclear. However, a more apparent linear relationship was observed with the transverse reinforcement ratio. By conducting a quantitative analysis of the transverse reinforcement ratio, the researchers proposed an modified estimation model of energy consumption capacity for reinforced concrete components with axial force. Nonetheless, the accuracy of the modified estimation model was found to be high within the range of 0–250,000 kN mm of cumulative energy consumption. For cumulative energy consumption exceeding 250,000 kN mm, further experimental and theoretical research is still required to enhance the reliability of the modified estimation model.
作者机构：
[息朝庄] School of Civil Engineering, Hunan City University, Hunan, Yiyang, 413002, China;[张鹏飞; 杨茗钛; 范云飞; 吴林锋] Nuclear Resources Geological Survey, Non-ferrous Metals and Nuclear Industry Geological Exploration Bureau of Guizhou,, Guizhou, Guiyang, 550005, China;[邓会娟] Cores and Samples Center of Natural Resources, Hebei, Yanjiao, 065201, China
通讯机构：
[Zhang, P.] S;School of Civil Engineering, Hunan, China
