关键词：
6G;6G mobile communication;Confident Information Coverage Model(CIC);Energy consumption;Green IoT;Green products;Internet of Things;Monitoring;Network Lifetime;Reinforcement Learning;Sensors;Sleep Scheduling;Uranium
摘要：
The Internet of Things (IoT) enabled by 6G increases the number of devices and users exponentially. 6G IoT will cover the overall domain of the world. Due to the limited resources in the IoT environment, greener and smarter networks are indispensable for the sustainable development of the 6G IoT. In this paper, the issue of improving resource efficiency and extending network lifetime is studied. We propose a novel Confidence Information Coverage (CIC) node sleep scheduling algorithm based on reinforcement learning (CICRL). In CICRL, collaborative intelligence is achieved through Q-learning to meet the coverage rate with the least active nodes, thus balancing the energy consumption and prolonging the network lifetime. Compared with the Coordination Algorithm based on Reinforcement Learning (COORD), Low-Energy Adaptive Clustering Hierarchy (LEACH) and Sleep Scheduling Approach based on Learning Automata (PCLA), the simulation results demonstrate that the proposed algorithm satisfies coverage with fewer active nodes and improves the network lifetime substantially.
作者机构：
[Shuai, Bincai; Chen, Yong; He, Yang; Qiu, Changjun] Univ South China, Sch Mech Engn, Hengyang 421001, Peoples R China.;[Zheng, Pengfei] Southwestern Inst Phys, POB 432, Chengdu 610207, Peoples R China.
关键词：
Delivered by Ingenta Simulation;Corrosion Degree Calibration;Isotope;Wall Material
摘要：
The wall material of a tokamak is exposed to high radiation for a significant amount of time. Therefore, the most difficult problem in ensuring the safe operation of nuclear reactors is the design of a wall material that is conducive to the online monitoring of corrosion degree. In this study, we design an online detection system using isotope tracer technology to calibrate the corrosion degree of a tokamak wall material. Obtaining a sam-ple with a gradient isotope is key for calibration systems. Therefore, we simulate the isotope behavior during ion implantation such that the appropriate injection parameters can be selected to obtain wall-material sam-ples with a concentration gradient, thereby providing a theoretical basis for the corrosion degree calibration IP: 127001 On: Mon 26 Sep 2022 11:22:25 of wall materials.
作者机构：
[Li, Xiao-Hua; Pan, Xiao; Zou, You-Tian] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Li, Xiao-Hua; Wu, Xi-Jun] Univ South China, Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Eq, Hengyang 421001, Peoples R China.;[Li, Xiao-Hua] Hunan Normal Univ, Key Lab Low Dimens Quantum Struct & Quantum Contr, Changsha 410081, Peoples R China.;[Wu, Xi-Jun] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.;[He, Biao] Cent South Univ, Coll Phys & Elect, Changsha 410083, Peoples R China.
通讯机构：
[Xiao-Hua Li] S;School of Nuclear Science and Technology, University of South China, Hengyang 421001, China<&wdkj&>Cooperative Innovation Center for Nuclear Fuel Cycle Technology & Equipment, University of South China, Hengyang 421001, China<&wdkj&>Key Laboratory of Low Dimensional Quantum Structures and Quantum Control, Hunan Normal University, Changsha 410081, China
关键词：
favored one proton radioactivity;one-parameter model;half-lives
摘要：
All-inorganic cesium (Cs)-based perovskites have been considered as one of the most popular research directions in the community of perovskite photovoltaic devices over the recent years because of their more competitive environmental stability in comparison with the traditional organic-inorganic hybrid perovskite candidates. Since the first attempt for the all-inorganic photovoltaic solar cell in 2014, the recently stabilized device efficiency has exceeded 20% and a large number of relevant researches have been reported. Different optimization strategies, including component replacement, additive, dimension regulation and process modulation, are the conditions to be fulfilled beforehand for the improvement of both stability and efficiency of the inorganic perovskite devices, affording exclusive advantages for application into device architecture. In this review article, the significant advancements of all-inorganic perovskite are systematically discussed, ranging from the materials component and structure to the preparation processing technique. Moreover, we also take several insights into the kinetics for moisture, illumination and thermal stability of the all-inorganic perovskites. We also discuss the promised advantages and shortcomings of each strategy that has been presented in the most recent publications. Finally, we summarize the current challenges and prospects for the future investigation directions of implementing varying strategies to fabricate high-performance photovoltaic devices, promoting their commercial application. (c) 2022 Elsevier Ltd. All rights reserved.
期刊：
Sensors and Actuators B-Chemical,2022年368:132202 ISSN：0925-4005
通讯作者：
Jie Hu<&wdkj&>Yong Chen
作者机构：
[Hu, Jie] Qingdao Univ, Coll Mat Sci & Engn, Qingdao 266071, Peoples R China.;[Guan, Wangwang; Xiong, Xueqing; Chen, Yong] Univ South China, Sch Mech Engn, Hengyang 421001, Peoples R China.;[Long, Haizhu] Xiangtan Univ, Sch Mat Sci & Engn, Xiangtan 411105, Peoples R China.
通讯机构：
[Jie Hu] C;[Yong Chen] S;College of Materials Science and Engineering, Qingdao University, Qingdao 266071, China<&wdkj&>School of mechanical engineering, University of South China, Hengyang 421001, China
摘要：
A carbon nanomaterials-modified MOF-derived Co3O4 p-p heterojunction was successfully constructed using a solution-combination-calcination method. The morphological and structural characteristics and their gas sensing performances were comprehensively investigated. Particularly, the synergistic effect between different carbon nanomaterials and Co3O4 mesoporous structures was carefully studied. The gas sensing results revealed that the sensor based on the CNT-rGO-Co3O4 nanocomposites exhibited better gas sensing properties toward the ethanol gas, including higher response, admirable antihumidity, and shorter response-recovery time than the other Co3O4 samples. The gas sensitivity of CNT-rGO-Co3O4 nanocomposites reached to be as high as 127.1, which was 5.8 times higher than that of a pure Co3O4 gas sensor when exposed to 100 ppm ethanol. The enhanced gas sensing performance of the sensor fabricated by the CNT-rGO-Co3O4 nanocomposites could be attributed to the promising synergistic effect between carbon nanomaterials and Co3O4 nanobox, implying that the heterojunction structure and coupling effect would dramatically optimize the gas sensing reaction process, resulting in improved gas sensing performance.
摘要：
Pyrite, a mineral associated with uranium ore, is closely related to uranium leaching. In this study, Ozone micro-nano bubbles (OMNBs), as an environmentally friendly advanced oxidation technology, were used for the first time to oxidize pyrite under experimental conditions to improve the leaching rate of uranium. A laboratory-scale agitation leaching experiment of pyrite was carried out with a pH of 1.0-3.0, gas flow of 1-3 L/min, ozone generation rate of 0.55-2.22 mg/s, and pyrite concentration of 0.1-5.0 g/L for 1 h. By adding three different co-oxidant: Mn(II), Mn(IV), and Fe(III), it was found that only Mn(IV) increased the oxidation rate of pyrite by 21.7%. The results of the scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS) show that the formation of Fe(III)-O film on the surface of the ore suppresses the oxidation rate of pyrite to a certain extent. Pyrite can be rapidly oxidized up to 57.6% by OMNBs, which is beneficial to uranium leaching. This method is expected to be used for in situ acid leaching of uranium with OMNBs injected into the ground. Highlights OMNBs accelerate the oxidation of pyrite compared with air, oxygen micro-nano bubbles, and ozone conventional bubbles. The increase in system acidity, gas flow, and ozone generation rate can accelerate the oxidation of pyrite by OMNBs. The excessively high concentration of iron ions in the system hinders the further oxidation of pyrite to a certain extent.
期刊：
Journal of Manufacturing Processes,2022年81:236-249 ISSN：1526-6125
通讯作者：
Xingwang Bai
作者机构：
[Yu, Xueqi; Shi, Xiqiao; Bai, Xingwang] Univ South China, Sch Mech Engn, Hengyang 421001, Hunan, Peoples R China.;[Yu, Xueqi; Shi, Xiqiao] Univ South China, Hunan Collaborat Innovat Ctr Nucl Fuel Cycle Techn, Hengyang 421001, Hunan, Peoples R China.;[Zhou, Xiangman] China Three Gorges Univ, Coll Mech & Power Engn, Yichang 443002, Hubei, Peoples R China.;[Zhang, Haiou] Huazhong Univ Sci & Technol, Sch Mech Sci & Engn, Wuhan 430074, Hubei, Peoples R China.
通讯机构：
[Xingwang Bai] S;School of Mechanical Engineering, University of South China, Hengyang, Hunan 421001, China
关键词：
Wire and arc additive manufacturing;Gravity -driven side powder feeding;Steel matrix composite components;WC;Wear resistance;Tensile performance
摘要：
Wire and Arc Additive Manufacturing (WAAM), which exhibits high deposition rate and low production cost, is a promising method for fabricating large-sized composite components. In this work, the WAAM process is applied to fabricate steel matrix composite components by introducing WC/Fe powder into the molten pool through gravity-driven side powder feeding. The effects of WC powder fraction on the microstructure, mechanical properties and wear resistance of deposited components have been investigated. The results reveal that WC particles are completely dissolved into the matrix for the specimen with 20 wt% WC powder, resulting in a fine bainite microstructure with W element. For specimens with WC powder fraction above 20 wt%, different structures of (Fe,W)6C phase, including discontinue and continue networks, fishbone type, and flocculent particles, are formed due to intensive reaction between WC particles and the matrix. The latter two structures are more likely to appear in specimens with high WC powder fraction. The specimen with low WC powder fraction exhibits quasi-cleavage fracture during the tensile test, while brittle fracture is observed for the specimen with high WC powder fraction. Tests prove that the mechanical properties and wear resistance have been improved by the addition of WC. The maximum strength, the maximum microhardness and the minimum wear loss are obtained for the specimens with WC powder fractions of 40 wt%, 100 wt%, and 80 wt% respectively. The improved properties of deposited composite components can be attributed to the synergistic effects of solution strengthening, precipitation strengthening of (Fe,W)6C phase, second strengthening of retained WC blocks and fine-grain strengthening.
期刊：
International Journal of Materials Research,2022年94(9):1006-1011 ISSN：1862-5282
通讯作者：
Rao, KP
作者机构：
[Rao, K. P.; Li, L. X.] City Univ Hong Kong, Dept Mfg Engn & Engn Management, Kowloon, Tat Chee Ave, Hong Kong, Peoples R China.;[Peng, D. S.; Li, L. X.] Cent South Univ Technol, Coll Mat Sci & Engn, Changsha, Peoples R China.;[Lou, Y.] Nanhua Univ, Coll Mech Engn, Hengyang, Peoples R China.
通讯机构：
[Rao, KP ] C;City Univ Hong Kong, Dept Mfg Engn & Engn Management, Kowloon, Tat Chee Ave, Hong Kong, Peoples R China.
摘要：
The flow behavior and hot deformation mechanisms of Ti-6Al-4Vin both beta and (alpha + beta) phase regions have been studied by compression tests in the temperature range 750 - 1100 degrees C and strain rate range 0.05 -15 s (-1). The flow curves displayed discontinuous yielding at temperatures above 850 degrees C and high strain rates, typically 5 and 15 s(-1). Flow oscillations were also observed under such conditions. The relative discontinuous flow stress drop increased with increasing temperature in the (alpha + beta) phase region and reached a steady state in the beta phase region. The discontinuous yielding is attributed to the sudden increase in the mobile dislocation density occurring due to the activation of beta grain boundary sources during hot deformation. The apparent activation energy estimated using the standard kinetic analysis is about 246 kJ/mol in the beta region and 621 kJ/ mol in the (alpha + beta) region while the strain rate sensitivity values are 0.34 and 0.18, respectively. The mechanism in the beta region has been suggested to involve grain boundary sliding and dynamic recovery of the beta phase while in the (alpha + beta) region a transient mechanism, involving dynamic recovery followed by post deformation recrystallization, has been proposed.
关键词：
6G Internet of Things (IoT);6G mobile communication;Computational modeling;Confident Information Coverage Model (CIC);Coverage Hole (CHs);Energy consumption;Internet of Things;Maintenance engineering;Mobile Edge Computing (MEC);Q-learning;QLearning;Reliability
期刊：
Mechanics of Advanced Materials and Structures,2022年29(28):7772-7780 ISSN：1537-6494
通讯作者：
Fu, Chun-ming;Qiu, Shi-jia
作者机构：
[Li, Zhen-ye; Huo, Shao-yong; Fu, Chun-ming] Univ South China, Coll Mech Engn, Hengyang, Peoples R China.;[Fan, Shao-zhang; Xie, Guan-hong; Gong, Xiao-chao; Qiu, Shi-jia] 1MORE INC, Shenzhen, Peoples R China.
通讯机构：
[Fu, Chun-ming] U;[Qiu, Shi-jia] 1;Univ South China, Coll Mech Engn, Hengyang, Peoples R China.;1MORE INC, Shenzhen, Peoples R China.
关键词：
Pillared phononic crystal;valley-locked waveguide state;valley Hall effect;elastic wave;broadband
摘要：
Here, a broadband topological valley-locked waveguide state (TVWS) of elastic wave with adjustable mode width is reported in the phononic crystal plate with asymmetric double-sided pillars. The broadband topological bandgap is achieved by adjusting the height of triangular pillars. The TVWS with adjustable mode width is realized by adding a pillared phononic crystal (PPnC) with Dirac points between two valley PPnCs with distinct topological phase. The TVWS of elastic wave exhibits the properties of gapless dispersion and robustness against bends and disorders. Based on the TVWS, an elastic valley-locked waveguide splitter with variable mode width is further demonstrated.
摘要：
In this paper, laser texturing is performed on the surface of Mn-Cu and Fe-Zn damping alloys and the tribological properties of the samples with various surface weaves under dry-sliding conditions are investigated. The results show that the surface weave parameters affect the size of the contact surface and change the number of micro-convex bodies at the contact interface. This leads to changes in the tangential damping of the contact and further affects the magnitude of the friction coefficient. Additionally, the damping properties significantly affect the wear mechanism and make it more prone to adhesive wear.
摘要：
In this article, a novel flower-like WO3-In2O3 hollow heterostructure was successfully constructed by using an in situ etching method. The morphology characteristics revealed that the In2O3 nanoparticles with average sizes of 50 nm were evenly grown at the mesoporous WO3 hollow microsphere composed with self-assembly WO3 nanoplates (WO3 NPs). In order to evaluate advancements of well-designed heterojunction architecture, the gas sensing properties of varying sensors fabricated by pristine WO3, flower-like WO3 hollow sphere, and flower-like WO3-In2O3 hollow heterojunction to acetone gas were systematically investigated. The gas sensing consequences demonstrated that such SH-WO3-In2O3 structure achieved a higher acetone sensing performance with respect to that of pristine WO3 and SH-WO3 sensing materials, which could be ascribed to the promising synergistic effect between admirable flower-hollow structure and n-n type heterojunction configuration. More importantly, this investigation on fabricating well-designed WO3-In2O3 heterostructure may offer new insight and useful strategy to improve the sensing performance for certain metal oxide semiconductor-based gas sensing materials by reasonably utilizing the synergistic effect of structure and component.
通讯机构：
[Weiwei Xiao] S;School of Mechanical Engineering, University of South China, Hengyang, Hunan, 421001, China<&wdkj&>Hunan Provincial Key Laboratory of Emergency Safety Technology and Equipment for Nuclear Facilities, University of South China, Hengyang, Hunan, 421001, China
关键词：
X-ray diffraction line broadening;EBSD;W -H plot;Microstructural parameter;As -deposited Al coating
摘要：
Aluminum (Al) coatings were deposited on Zr-4 alloy substrate by magnetron sputtering. The microstructure parameters of the as-deposited coating were characterized by means of scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and electron backscattered scattering detection (EBSD). The results showed that: via the SEM and EDS, it can be found that Al atoms and Zr atoms undergo rapid interdiffusion at the interface, forming an Al-Zr diffusion layer with a thickness of about 1.5 mu m; via X-ray diffraction line broadening, the estimated crystal size was 81.53 nm and the as-deposited Al coating presences lattice tensile strain; via EBSD, the fraction of HAGBs is overwhelmingly larger than that of LAGBs and the mean grain size is 0.55 mu m, also, the Al coating exhibits the (100)<001> texture.
