通讯机构：
[Li, B ] W;Wuhan Polytech Univ, Sch Mech Engn, Wuhan 430023, Hubei, Peoples R China.
摘要：
A deep eutectic solvent (DES) was synthesized from urea (U), acrylamide (AM), and choline chloride (ChCl). ZnO was dispersed in the DES as a filler, and nanocomposite hydrogels (ZnO/P(U-AM-ChCl)) were successfully prepared by frontal polymerization (FP). The hydrogels were verified by Fourier infrared spectroscopy to contain ZnO nanoparticles (ZnO-NPs). The swelling behaviour, conductivity, and antibacterial properties of the ZnO nanocomposite hydrogels were investigated. The results showed that the ZnO/P(U-AM-ChCl) hydrogels had excellent antibacterial properties and exhibited super high inhibition rates of 81.87% and 88.42% against two basic colonies of Gram-negative and Gram-positive bacteria, respectively. The equilibrium swelling of the hydrogels was found to increase significantly from 9.30 to 12.29 with the addition of ZnO, while the ZnO/P(U-AM-ChCl) hydrogel conductivity exhibited good UV sensitivity. This study provides a rapid and low-energy method for the preparation of nanocomposite hydrogels with excellent antibacterial properties.
通讯机构：
[Liu Yang] S;[Yanbao Guo] C;College of Mechanical and Transportation Engineering, China University of Petroleum, Beijing, 102249, China<&wdkj&>Beijing Key Laboratory of Process Fluid Filtration and Separation, Beijing, 102249, China<&wdkj&>School of Mechanical Engineering, Wuhan Polytechnic University, Wuhan, 430023, China<&wdkj&>College of Mechanical and Transportation Engineering, China University of Petroleum, Beijing, 102249, China<&wdkj&>College of Chemical and Materials Engineering, University of Alberta, T6G 1H9, Edmonton, Alberta, Canada
摘要：
In order to realize the real-time monitoring of the grain condition, grain condition information should be collected during storage operations. A drill-in granary grain condition detector which can drill into a grain pile in a granary is proposed. The kinematic models of four Archimedes screw mechanisms were established, and the motion characteristics of grain particles in spiral grooves were described. Several groups of single variable simulation experiments are designed to discuss the important factors affecting the motion performance of the detector. Based on a discrete element method with multi-body dynamics (DEM-MBD) simulation calculation, the force and velocity change images of grain particles were obtained to verify the feasibility of the scheme. The steering function of the detector is verified by simulation, and the relationship between the steering radius and the screw rotation speed difference is analyzed. The results show that the drill-in granary grain condition detector can move forward and turn when it is immersed in the grain pile. It has the characteristics of excellent flexibility and a high degree of freedom. It compensates for the current situation in which robots cannot go deep inside the grain pile and complete the steering.
期刊：
Frontiers in Energy Research,2022年10:902829 ISSN：2296-598X
通讯作者：
Tu, Z.;Xing, L.
作者机构：
[Xiao, Chenguang; Pei, Houchang] School of Mechanical Engineering, Wuhan Polytechnic University, Wuhan, China;[Xing, Lu] Mechanical and Construction Engineering, Northumbria University, Newcastle upon Tyne, United Kingdom;[Tu, Zhengkai] School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, China
通讯机构：
[Xing, L.] M;[Tu, Z.] S;School of Energy and Power Engineering, China;Mechanical and Construction Engineering, United Kingdom
作者机构：
[Xiao, Chenguang; Pei, Houchang] Wuhan Polytech Univ, Sch Mech Engn, Wuhan 430048, Peoples R China.;[Tu, Zhengkai] Huazhong Univ Sci & Technol, Sch Energy & Power Engn, Wuhan 430074, Peoples R China.
通讯机构：
[Zhengkai Tu] S;School of Energy and Power Engineering, Huazhong University of Science & Technology, Wuhan 430074, China
关键词：
Electric quantity;Proton exchange membrane fuel cell;Visualisation;Water distribution;Water formation
摘要：
Water management is critical to the operation of a proton exchange membrane fuel cell (PEMFC). The accumulation of water in the cathode channel of a newly designed transparent PEMFC is investigated in this work. The electric quantity per square metre (q(e)) produced by electrochemical reaction is used to estimate the liquid water formation characteristics. Results show that the water produced by the electrochemical reaction first exists in a gaseous state in the flow channel and then transforms to liquid water. Liquid water begins to appear in the flow channel when q(e) reaches approximately 1.8 x 10(5) C.m(-2) in different current density and loading rate. However, a higher current density and loading rate would decrease liquid water forming time of the fuel cell channel. In addition, cell temperature affects the q e value, and when the cell temperature rises from 45 to 75 degrees C, q(e) decreases from 2.25 x 10(5) to 1.5 x 10(5) C.m(-2); the amount of charge is approximately inversely proportional to the cell temperature. Liquid water first appears at the inlet of the flow channel, specifically at the contact point between the inlet flow channel and carbon paper. Liquid water is concentrated at the edge channel of the flow field area and rarely distributed in the middle of the single cell.
期刊：
Journal of Materials Research and Technology,2022年20:2277-2292 ISSN：2238-7854
通讯作者：
Junsong Jin
作者机构：
[Gong, Pan; Jin, Junsong; Wang, Xinyun; Wen, Hongning; Zhang, Mao; Zheng, Chaowei] Huazhong Univ Sci & Technol, Sch Mat Sci & Engn, State Key Lab Mat Proc & Die & Mould Technol, 1037 Luoyu Rd, Wuhan 430074, Peoples R China.;[Wang, Ying] Wuhan Polytech Univ, Sch Mech Engn, Wuhan 430000, Peoples R China.
通讯机构：
[Junsong Jin] S;State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China
关键词：
High -entropy alloys;Recrystallization;Annealing;Grain growth;Plastic deformation
摘要：
The recrystallization and grain growth behavior of CoCrFeMnNi high-entropy alloys (HEAs) with different plastic deformations were studied. Differential scanning calorimetry (DSC) tests were novelly adopted to characterize the recrystallization process. Experimental results suggest that pre-deformation has great promotion on the recrystallization rate and degree. The recrystallized grain size decreases with increasing deformation due to increased potential nucleation sites. Severe deformation and low annealing temperature are helpful to refine annealed grains. A static recrystallization model for variously deformed HEAs was developed, in which the recrystallization rate was expressed as a function of strain and annealing temperature. An improved grain growth model was established, which takes the recrystallization process into consideration and declares that the annealed grain size decreases first and then increases. The recrystallization fraction and the annealed grain size of the HEAs with different deformations annealed at different temperatures can be predicted.(c) 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
通讯机构：
[Liu Yang] C;College of Mechanical Engineering, Wuhan Polytechnic University, Wuhan, 430048, Hubei, China
关键词：
Brown rice;Fracturing behavior;Fracture energy;Optical morphology
摘要：
During rice processing, grain fracture is a key problem for industrial production, various forces act on brown rice during working, and compression load is a critical factor for grain fracturing. A developed compression tester was built with optical observation to better understand the brown rice fracturing behavior. The relationship between fracture morphology and energy was researched. A fracture energy mathematics model was established. The relationship between fracture energy, force and deformation was analyzed. Test results indicate that brown rice fracture behavior can be divided into three stages: elastic interaction, plastic deformation, mixed fracture. The fracture energy of brown rice is related to the size and degree of core fracture area. Fracture behavior and energy are affected by brown rice moisture content, and fracture energy is positively correlated with cracks. The drying temperature at 75 degrees C is a turning point in the fracture energy of brown rice. The effect of compression time T is larger than compression velocity on test sample fracture energy. The study provides in-depth analysis for brown rice fracturing mechanism, for revealing the law of grain fracture energy.
通讯机构：
[Ying Wang] C;College of Mechanical Engineering, Wuhan Polytechnic University, Wuhan 430048, China<&wdkj&>Author to whom correspondence should be addressed.
摘要：
Ni-based alloy is an ideal candidate for its application in the field of hydrogen evolution of water splitting due to its good durability, excellent catalytic properties and low hydrogen evolution overpotential. In this paper, porous Ni-Sn alloy materials were prepared by activation reaction sintering, and the pore structure was tailored by adjusting Sn content. The effects of Sn content and electrolyte temperature on the hydrogen evolution properties of porous Ni-Sn alloy electrodes in 6 mol center dot L-1 KOH solution were studied by electrochemical measurement methods, such as cyclic voltammetry (CV) curves, electrochemical impedance spectroscopy (ESI) and linear sweep voltammetry, and the mechanism of hydrogen evolution was further discussed. The experimental results reveal that when Sn content is 45 wt%, porous Ni-Sn alloy exhibits the best catalytic performance for hydrogen evolution with a Tafel slope of 164.69 mV center dot dec(-1) and an overpotential of 170 mV. The tested electrode also shows good stability for hydrogen evolution in alkaline solution, and the apparent activation energy calculated at room temperature is 29.645 kJ center dot mol(-1). The catalytic mechanism of hydrogen evolution is as follows: the addition of Sn significantly reduces the dissociation degree of M-H bonds, thereby reducing the overpotential of hydrogen evolution; with the increase of Sn content, the porous Ni-Sn electrode displays a higher electrochemical active surface area (ECSA), which makes porous Ni-Sn alloy exhibit good hydrogen evolution catalytic performance.
期刊：
2022 International Seminar on Computer Science and Engineering Technology (SCSET),2022年:27-31
作者机构：
[Hongjun Yang; Guoyu Hu; Li Lu] School of Mechanical Engineering, Wuhan Polytechnic University, Wuhan, China
摘要：
The sorting and handling of materials is an essential part of the automated production line. However, the traditional sorting method cannot meet the current development needs due to low efficiency. This paper proposes an automatic sorting system by pneumatic robots with machine vision technology. The system is composed of machine vision unit, automatic conveying unit, pneumatic robot unit and controller unit. The machine vision software Halcon is selected to recognize the image accurately, and a sorting execution device is designed which is combined with pneumatic manipulator and pushing mechanism. Programmable controller (PLC) is selected as the controller, and the hardware and software of the control system are designed. Finally, the system is simulated and the results show that the system can quickly realize the sorting of materials of different shapes and colours, and improve the efficiency and accuracy of sorting.
通讯机构：
[Jinlin Xiong] S;School of Mechanical Engineering, Wuhan Polytechnic University, Wuhan 430023, China<&wdkj&>Author to whom correspondence should be addressed.
作者机构：
[Mei, Q. S.; Xu, T.; Chen, F.; Chen, Z. H.; Li, C. L.; Wang, Y. C.; Mei, X. M.; Tan, Y. Y.; Wan, L.] Wuhan Univ, Sch Power & Mech Engn, Wuhan 430072, Peoples R China.;[Mei, Q. S.] Wuhan Univ, Minist Educ, Key Lab Hydraul Machinery Transients, Wuhan 430072, Peoples R China.;[Li, J. Y.] Wuhan Polytech Univ, Sch Mech Engn, Wuhan 430023, Peoples R China.
通讯机构：
[Q.S. Mei] S;School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China<&wdkj&>Key Laboratory of Hydraulic Machinery Transients (Wuhan University), Ministry of Education, Wuhan 430072, China
摘要：
In this study, a novel solid-state alloying approach was adopted to fabricate Al-Mg alloys with high Mg contents (C-Mg) by accumulative roll-bonding (ARB) of Al and Mg elemental materials to ultrahigh cycles. Experimental results showed that the degree of alloying increased with the increase of ARB cycles and a supersaturated alpha-Al solid solution accompanied with nanoprecipitates was formed in the Al-Mg alloys by ARB to 70 cycles. The as-prepared Al-Mg alloys exhibited enhanced mechanical properties, with a maximum tensile strength of similar to 615 MPa and a tensile elongation of similar to 10% at C-Mg = 13 wt.%. The high strength can be attributed to different mechanisms, namely solid solution strengthening, grain boundary strengthening, dislocation strengthening, and precipitation strengthening. The Al-Mg alloys showed increased work hardening with increasing C-Mg, due to the enhanced formation of nanoprecipitates. Meanwhile, no obvious drop in the intergranular corrosion (IGC) resistance was found in the Al-Mg alloys with C(Mg)up to 13 wt.%. Moreover, sensitization treatment was found to induce little decrease in the IGC resistance of the Al-Mg alloys with C-Mg <= 13 wt.%. We found that the excellent IGC resistance was due to the suppression of grain boundary precipitation by the preferred formation of precipitates within the grains that were induced by ARB. Our study indicated the novelty of the present solid-state alloying approach to achieving a superior combination of high mechanical properties and IGC resistance in Al-Mg alloys. (C) 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
