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Multi-objective optimization of reservoir refill operate considering energy storage and hydrological conditions 认领 引用
1
作者 Lihua Chen Kaipeng Yang +2 位作者 Yunyao Chen Xiaoli Zhang Xuefang Li 《River》 EI CSCD 2026年第2期282-294,共13页
Optimizing reservoir refill operation rules is crucial for enhancing reservoir sustainability and resilience.This study proposes a refill operation model designed to derive optimal refill guide curves by considering f... Optimizing reservoir refill operation rules is crucial for enhancing reservoir sustainability and resilience.This study proposes a refill operation model designed to derive optimal refill guide curves by considering flood risk prevention,maximum storage levels,and the combined benefits of hydropower generation and energy storage.The proposed model was applied to the Longtan Reservoir in China.The results indicate that employing various optimal refill guide curves,tailored to wet,normal,and dry hydrological conditions,yields better outcomes than using a single refill guide curve.In wet years,the maximum annual combined benefits of hydropower generation and energy storage increased by 2.88%.In normal and dry years,the average annual water level at the end of the water storage period was significantly raised by 0.71 and 1.9 m,respectively.Correspondingly,the reservoir storage volume increased by 2.53×108m3and 6.19×108m3,respectively.These findings demonstrate that the proposed approach can enhance the benefits of refill operations at the Longtan Reservoir under varying hydrological conditions. 展开更多
关键词 energy storage hydrological conditions multi‐objective optimization NSGA‐II reservoir refill guide curves
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Electrolyte refilling to extend lifetime of lithium-ion battery 认领 引用
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作者 Jiangong Zhu Yiqun Jin +6 位作者 Wenjun Fan Xiuwu Wang Haonan Liu Zhen Yin Wentao Xu Xuezhe Wei Haifeng Dai 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第8期664-674,I0015,共11页
Lithium-ion battery is one of the key components in electric vehicles,which has been widely used as the carrier for transportation electrification.Extending the lifetime of lithium-ion batteries reduces the resulting ... Lithium-ion battery is one of the key components in electric vehicles,which has been widely used as the carrier for transportation electrification.Extending the lifetime of lithium-ion batteries reduces the resulting economic burden and promotes the large-scale development of electric vehicles.Electrolyte loss is deemed as one of the key factors leading to the fast degradation of lithium-ion batteries.In this study,we systematically investigate the failure mechanisms induced by electrolyte depletion using commercial NCM811/Si-C pouch cells with controlled electrolyte gradients(deficient,standard,and excess).Through multi-scale characterization,we reveal that electrolyte deficiency triggers heterogeneous electrode wetting,localized lithium plating,and non-uniform solid electrolyte interface(SEI)growth,leading to rapid capacity rollover.To counteract this,we introduce an innovative refilling strategy based on real-time monitoring of the direct current resistance(DCR).By applying a non-overlapping sliding window and a two-point feature extraction model,we accurately identify the optimal refilling timing upon detecting a sharp DCR surge,transforming refilling from a retrospective salvage operation into a predictive lifetime extension strategy.This approach achieves over 90%reduction in capacity fade rate,extends cycle life by more than 600 cycles,and significantly restores internal resistance and electrochemical homogeneity.Validation across multiple systems,including 1 Ah pouch cells and 120 Ah commercial prismatic batteries,confirms the broad applicability and efficacy of our method.Our work provides a practical,low-cost route to enhance battery durability and support second-life applications,contributing to sustainable energy storage. 展开更多
关键词 Lithium-ion battery Extending lifetime Loss of electrolyte Refilling
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Microstructure evolution and corrosion behavior of refill friction stir spot welding joint for dissimilar Al alloys 认领 引用 被引量：1
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作者 Fang-yuan JIANG Da ZHANG +3 位作者 Yan-kun MA Jiang-tao XIONG Wei GUO Jing-long LI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第1期80-95,共16页
The dissimilar 2B06 and 7B04 Al alloy joints were prepared by refill friction stir spot welding(RFSSW),and the microstructural evolution and corrosion behavior of the joints were investigated.Based on microstructural ... The dissimilar 2B06 and 7B04 Al alloy joints were prepared by refill friction stir spot welding(RFSSW),and the microstructural evolution and corrosion behavior of the joints were investigated.Based on microstructural analysis,the welded joints exhibit distinct microstructural zones,including the stir zone(SZ),thermomechanically affected zone(TMAZ),and heat-affected zone(HAZ).The grain size of each zone is in the order of HAZ>TMAZ>SZ.Notably,the TMAZ and HAZ contain significantly larger secondary-phase particles compared to the SZ,with particle size in the HAZ increasing at higher rotational speeds.Electrochemical tests indicate that corrosion susceptibility follows the sequence of HAZ>TMAZ>SZ>BM,with greater sensitivity observed at increased rotational speeds.Post-corrosion mechanical performance degradation primarily arises from crevice corrosion at joint overlaps,but not from the changes in the microstructure. 展开更多
关键词 refill friction stir spot welding high strength Al alloy dissimilar joint microstructure evolution corrosion behavior
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Modeling and optimization of aluminum-steel refill friction stir spot welding based on backpropagation neural network 认领 引用
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作者 Shi-yi Wang Yun-qiang Zhao +3 位作者 Korzhyk Volodymyr Hao-kun Yang Li-kun Li Bei-xian Zhang 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2025年第7期2104-2115,共12页
Refill friction stir spot welding process is difficultly optimized by accurate modeling because of the high-order functional relationship between welding parameters and joint strength.A database of the welding process... Refill friction stir spot welding process is difficultly optimized by accurate modeling because of the high-order functional relationship between welding parameters and joint strength.A database of the welding process was first established with 6061-T6 aluminum alloy and DP780 galvanized steel as base materials.This dataset was then optimized using a backpropagation neural network.Analyses and mining of the experimental data confirmed the multidimensional mapping relationship between welding parameters and joint strength.Subsequently,intelligent optimization of the welding process and prediction of joint strength were achieved.At the predicted welding parameter(plunging rotation speedω1=1733 r/min,refilling rotation speedω2=1266 r/min,plunging depth p=1.9 mm,and welding speed v=0.5 mm/s),the tensile shear fracture load of the joint reached a maximum value of 10,172 N,while the experimental result was 9980 N,with an error of 1.92%.Furthermore,the correlation of welding parameters-microstructure-joint strength was established. 展开更多
关键词 Refill friction stir spot welding-Neural network Welding parameter optimization Microstructure Joint strength
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Interfacial bonding mechanism in Al/coated steel dissimilar refill friction stir spot welds 认领 引用 被引量：16
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作者 Z. Shen Y. Ding +4 位作者 J. Chen B. Shalch Amirkhiz J.Z. Wen L. Fu A.P. Gerlich 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2019年第6期1027-1038,共12页
Defect-free dissimilar Al/zinc coated steel and Al/AlSi coated steel welds were successfully fabricated by refill friction stir spot welding. However, Al alloy and uncoated steel could not be welded under the same wel... Defect-free dissimilar Al/zinc coated steel and Al/AlSi coated steel welds were successfully fabricated by refill friction stir spot welding. However, Al alloy and uncoated steel could not be welded under the same welding condition. Al-Zn eutectic layer formed at the Al/zinc coated steel interface showed nonuniformity in thickness and nanoscale intermetallic(IMC) produced was discontinuous. The bonding formation between the Al-Zn layer and the surrounding materials was attributed to a liquid/solid reaction mechanism. Bonding formation at Al alloy and AlSi coated steel interface was attributed to a solid/solid reaction mechanism, as the joining process did not involve with melting of base metals or AlSi coating materials. Kissing bond formed at the weld boundary acted as a crack initiation and propagation site,and the present study showed that weld strength of Al 5754/AlSi coated steel was greatly influenced by properties of original IMC layer. 展开更多
关键词 Refill friction stir spot welding Al alloy Steel Coated materials Joining mechanism
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Refill friction stir spot welding of 5083-O aluminum alloy 认领 引用 被引量：18
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作者 Zhiwu Xu Zhengwei Li +1 位作者 Shude Ji Liguo Zhang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2018年第5期878-885,共8页
In this work,refill friction stir spot welding（RFSSW） was used to weld 2 mm-thick 5083-O alloy.The Box–Behnken experimental design was used to investigate the effect of welding parameters on the joint lap shear pro... In this work,refill friction stir spot welding（RFSSW） was used to weld 2 mm-thick 5083-O alloy.The Box–Behnken experimental design was used to investigate the effect of welding parameters on the joint lap shear property.Results showed that a surface indentation of 0.3 mm effectively eliminated the welding defects.Microhardness of the stir zone（SZ） was higher than that of the base material（BM） and the hardness decreased with increasing the heat input during welding.The optimum failure load of 7.72 k N was obtained when using rotating speed of 2300 rpm,plunge depth of 2.4 mm and refilling time of 3.5 s.Three fracture modes were obtained during the lap shear test and all were affected by the hook defect. 展开更多
关键词 Refill friction stir spot welding Keyhole Secondary phases Microhardness Lap shear failure load
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Refill Friction Stir Spot Welding of Similar and Dissimilar Alloys:A Review 认领 引用 被引量：5
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作者 Xiao-Song Feng Song-Bin Li +1 位作者 Li-Na Tang Hui-Min Wang 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2020年第1期30-42,共13页
Refi ll friction stir spot welding,also known as friction spot welding(FSpW),is a solid-state welding process suitable for spot joining of lightweight materials.Through the eff orts of improving joint quality for simi... Refi ll friction stir spot welding,also known as friction spot welding(FSpW),is a solid-state welding process suitable for spot joining of lightweight materials.Through the eff orts of improving joint quality for similar and dissimilar materials,for example,aluminum and magnesium,this joining technology is well developed.The joining mechanism and process characteristics of FSpW have been widely studied.However,the application of FSpW in industry has not been entirely successful.In this review article,the research of similar and dissimilar material joints,such as,Al/Cu,Al/Ti,Al/Mg and Al/Steel,is summarized.The microstructural features and mechanical properties of the joints,welding tool and the application development are discussed in detail. 展开更多
关键词 Refill friction stir spot welding Dissimilar joints Microstructure Mechanical properties Welding parameters
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Effect of tool plunge depth on the microstructure and fracture behavior of refill friction stir spot welded AZ91 magnesium alloy joints 认领 引用 被引量：6
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作者 Hai-feng Zhang Li Zhou +4 位作者 Wen-lin Li Gao-hui Li Yi-tang Tang Ning Guo Ji-cai Feng 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2021年第4期699-709,共11页
We used refill friction stir spot welding(RFSSW)to join 2-mm-thick AZ91D-H24 magnesium alloy sheets,and we investigated in detail the effect of tool plunge depth on the microstructure and fracture behavior of the join... We used refill friction stir spot welding(RFSSW)to join 2-mm-thick AZ91D-H24 magnesium alloy sheets,and we investigated in detail the effect of tool plunge depth on the microstructure and fracture behavior of the joints.A sound joint surface can be obtained using plunge depths of 2.0 and 2.5 mm.Plunge depth was found to significantly affect the height of the hook,with greater plunge depths corresponding to more severe upward bending of the hook,which compromised the tensile-shear properties of the joints.The hardness reached a minimum at the thermo-mechanically affected zone due to the precipitation phases of this zone as it dissolved into theα-matrix during the welding process.The fracture modes of RFSSW joints can be divided into three types:shear fracture,plug fracture,and shear–plug fracture.Of these,the joint with a shear–plug fracture exhibited the best tensile-shear load of 6400 N. 展开更多
关键词 refill friction stir spot welding AZ91 magnesium alloy microstructure fracture behavior
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Refill Friction Stir Spot Welding Al Alloy to Copper via Pure Metallurgical Joining Mechanism 认领 引用 被引量：3
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作者 Zhikang Shen Yuquan Ding +6 位作者 Wei Guo Wentao Hou Xiaochao Liu Haiyan Chen Fenjun Liu Wenya Li Adrian Gerlich 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2021年第4期90-97,共8页
The current investigation of refill friction stir spot welding(refill FSSW)Al alloy to copper primarily involved plunging the tool into bottom copper sheet to achieve both metallurgical and mechanical interfacial bond... The current investigation of refill friction stir spot welding(refill FSSW)Al alloy to copper primarily involved plunging the tool into bottom copper sheet to achieve both metallurgical and mechanical interfacial bonding.Compared to conventional FSSW and pinless FSSW,weld strength can be significantly improved by using this method.Nevertheless,tool wear is a critical issue during refill FSSW.In this study,defect-free Al/copper dissimilar welds were successfully fabricated using refill FSSW by only plunging the tool into top Al alloy sheet.Overall,two types of continuous and ultra-thin intermetallic compounds(IMCs)layers were identified at the whole Al/copper interface.Also,strong evidence of melting and resolidification was observed in the localized region.The peak temperature obtained at the center of Al/copper interface was 591℃,and the heating rate reached up to 916℃/s during the sleeve penetration phase.A softened weld region was produced via refill FSSW process,the hardness profile exhibited a W-shaped appearance along middle thickness of top Al alloy.The weld lap shear load was insensitive to the welding condition,whose scatter was rather small.The fracture path exclusively propagated along the IMCs layer of Cu9Al4 under the external lap shear loadings,both CuAl2 and Cu9Al4 were detected on the fractured surface on the copper side.This research indicated that acceptable weld strength can be achieved via pure metallurgical joining mechanism,which has significant potential for the industrial applications. 展开更多
关键词 Refill friction stir spot welding Al alloy Copper Interfacial microstructure Mechanical properties
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Optimal early refill rules for Danjiangkou Reservoir 认领 引用 被引量：2
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作者 Yun WANG Sheng-lian GUO +2 位作者 Guang YANG Xing-jun HONG Ting HU 《Water Science and Engineering》 EI CAS CSCD 2014年第4期403-419,共17页
Water levels in reservoirs are generally not allowed to exceed the flood-limited water level during the flood season, which means that huge amounts of water spill in order to provide adequate storage for flood prevent... Water levels in reservoirs are generally not allowed to exceed the flood-limited water level during the flood season, which means that huge amounts of water spill in order to provide adequate storage for flood prevention and that it is difficult to fill the reservoir fully at the end of year. Early reservoir refill is an effective method for addressing the contradiction between the needs of flood control and of comprehensive utilization. This study selected the Danjiangkou Reservoir, which is the water source for the middle route of the South-North Water Diversion Project （SNWDP） in China, as a case study, and analyzed the necessity and operational feasibility of early reservoir refill. An early reservoir refill model is proposed based on the maximum average storage ratio, optimized by the progressive optimality algorithm, and the optimal scheduling schemes were obtained. Results show that the best time of refill operation for the Danjiangkou Reservoir is September 15, and the upper limit water level during September is 166 m. The proposed early refill scheme, in stages, can increase the annual average storage ratio from 77.51% to 81.99%, and decrease spilled water from 2.439 × 109 m^3 to 1.692×109 m^3, in comparison to the original design scheme. The suggested early significant comprehensive benefits, which decision-making. reservoir refill scheme can be easily operated with may provide a good reference for scheduling 展开更多
关键词 reservoir operation early reservoir refill operation rules in stages progressiveoptimality algorithm Danjiangkou Reservoir
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Effect of Sleeve Plunge Depth on Interface/Mechanical Characteristics in Refill Friction Stir Spot Welded Joint 认领 引用 被引量：1
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作者 Guang-Da Sun Li Zhou +5 位作者 Ren-Xiao Zhang Ling-Yun Luo Hao Xu Hong-Yun Zhao Ning Guo Di Zhang 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2020年第4期551-560,共10页
Refill friction stir spot welding was employed to produce 6061-T6 aluminum alloy joints with different sleeve plunge depths.The interface characteristics of joint-line remnant and hook are investigated by optical and ... Refill friction stir spot welding was employed to produce 6061-T6 aluminum alloy joints with different sleeve plunge depths.The interface characteristics of joint-line remnant and hook are investigated by optical and scanning electron microscopy.The joint-line remnant consists of primary bonding region and secondary bonding region,and two types of hook can be identified as downward hook and upward hook.Tensile shear results demonstrate that joint-line remnant and hook make interaction effects on tensile shear properties.The optimal joint is achieved when sleeve plunge depth was 2.0 mm with the corresponding failure load of 8673.4 N.Three different types of fracture mode are exhibited in joints produced at different sleeve plunge depths,which are closely related with the morphology of interface characteristics. 展开更多
关键词 Refill friction stir spot welding Interface characteristics Mechanical properties Fracture behavior
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Refill friction stir spot welding (RFSSW): a review of processing, similar/dissimilar materials joining, mechanical properties and fracture mechanism 认领 引用 被引量：1
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作者 Yun-qiang Zhao Hao-kun Yang +2 位作者 Aloshyn Andriia Hong-hang Lo Jia-xin Li 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2024年第8期1825-1839,共15页
Refill friction stir spot welding(RFSSW)provides a novel method to join similar and/or dissimilar metallic materials without a key-hole in the center of the joint.Having the key-hole free characterization,the similar/... Refill friction stir spot welding(RFSSW)provides a novel method to join similar and/or dissimilar metallic materials without a key-hole in the center of the joint.Having the key-hole free characterization,the similar/dissimilar RFSSW joint exhibits remarkable and endurable characteristics,including high shear strength,long fatigue life,and strong corrosion resistance.In the meanwhile,as the key-hole free joint has different microstructures compared with conventional friction stir spot welding,thus the RFSSW joint shall possess different shear and fatigue fracture mechanisms,which needs further investigation.To explore the underlying failure mechanism,the similar/dissimilar metallic material joining parameters and pre-treatment,mechanical properties,as well as fracture mechanisms under this novel technology will be discussed.In details,the welding tool design,welding parameters setting,and the influence of processing on the lap shear and fatigue properties,as well as the corrosion resistance will be mainly discussed.Moreover,the roadmap of RFFSW is also discussed. 展开更多
关键词 Refill friction stir spot welding Processing Mechanism Similar materials joining Dissimilar materials joining Microstructure Mechanical property Fracture mechanism
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Effect of refilling time on microstructure and mechanical properties of friction spot welded LY12 aluminum alloy 认领 引用 被引量：1
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作者 李政玮 姬书得 +2 位作者 马轶男 柴鹏 岳玉梅 《China Welding》 EI CAS 2015年第1期25-30,共6页
Friction spot welding （FSpW） was successfully used to produce joints of LY12 aluminum alloy. The effects of refilling time on microstructure and mechanical properties of FSpW joints were systematically studied. Resu... Friction spot welding （FSpW） was successfully used to produce joints of LY12 aluminum alloy. The effects of refilling time on microstructure and mechanical properties of FSpW joints were systematically studied. Results show that the cross-section of FSpW joint presents a basin-like morphology. A white bonding ligament exists in the center of the joint. The stir zone can be clarified into sleeve affected zone and pin affected zone based on different grain sizes. With increasing the refilling time from 2. 0 s to 3.5 s, grains in the stir zone become coarser, microhardness of the joint decreases and tensile shear failure load of the joint firstly increases and then decreases. The maximum tensile shear failure load of 8 130 N is attained when the refilling time is 3.0 s. Shear-plug fracture mode and shear fracture mode can be observed in the tensile shear tests. The maximum hardness of 169. 7 HV is attained in the joint center when the refilling time is 2. 0 s. 展开更多
关键词 friction spot welding refilling time microstructure tensile shear failure load
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Material flow behavior and microstructural evolution during refill friction stir spot welding of alclad 2A12-T4 aluminum alloy 认领 引用
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作者 Gao-hui Li Li Zhou +2 位作者 Ling-yun Luo Xi-ming Wu Ning Guo 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2021年第1期131-141,共11页
In this study, we used the stop-action technique to experimentally investigate the material flow and microstructural evolution of alclad 2A12-T4 aluminum alloy during refill friction stir spot welding.There are two ma... In this study, we used the stop-action technique to experimentally investigate the material flow and microstructural evolution of alclad 2A12-T4 aluminum alloy during refill friction stir spot welding.There are two material flow components, i.e., the inward-or outward-directed spiral flow on the horizontal plane and the upward-or downward-directed flow on the vertical plane.In the plunge stage, the flow of plasticized metal into the cavity is similar to that of a stack, whereby the upper layer is pushed upward by the lower layer.In the refill stage, this is process reversed.As such, there is no obvious vertical plasticized metal flow between adjacent layers.Welding leads to the coarsening of S(Al2CuMg) in the thermo-mechanically affected zone and the diminishing of S in the stir zone.Continuous dynamic recrystallization results in the formation of fine equiaxed grains in the stir zone, but this process becomes difficult in the thermo-mechanically affected zone due to the lower deformation rate and the pinning action of S precipitates on the dislocations and sub-grain boundaries, which leads to a high fraction of low-angle grain boundaries in this zone. 展开更多
关键词 refill friction stir spot welding aluminum alloy material flow behavior precipitate evolution dislocation configuration
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Capillary refill time as a guide for operational decision-making process of autoimmune pancreatitis:Preliminary results 认领 引用
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作者 Pinar Yazici Ismail Ozsan Unal Aydin 《World Journal of Gastrointestinal Surgery》 2015年第7期110-115,共6页
AIM: To investigate the efficacy of a novel intraoperative diagnostic technique for patients with preliminary diagnosis of autoimmune pancreatitis(AIP).METHODS: Patients with pancreatic surgery were reviewed to identi... AIM: To investigate the efficacy of a novel intraoperative diagnostic technique for patients with preliminary diagnosis of autoimmune pancreatitis(AIP).METHODS: Patients with pancreatic surgery were reviewed to identify those who received a preliminary diagnosis of AIP between January 2010 and January 2014. The following data were collected prospectively for patients with a pathological diagnosis of AIP: clinical and demographic features, radiological and operative findings, treatment procedure, and intraoperative capillary refill time(CRT) in the pancreatic bed.RESULTS: Eight patients(six males, two females; mean age: 51.4 years) met the eligibility criteria of pathologically confirmed diagnosis. The most frequent presenting symptoms were epigastric pain and weight loss. The most commonly conducted preoperative imaging studies were computed tomography and endoscopic retrograde pancreaticodoudenography. The most common intraoperative macroscopic observations were mass formation in the pancreatic head and diffuse hypervascularization in the pancreatic bed. All patients showed decreased CRT(median value: 0.76 s, range: 0.58-1.35). One-half of the patients underwent surgical resection and the other half received medical treatment without any further surgical intervention. CONCLUSION: This preliminary study demonstrates a novel experience with measurement of CRT in the pancreatic bed during the intraoperative evaluation of patients with AIP. 展开更多
关键词 Autoimmune pancreatitis Pancreatic mass Inflammation Hypervascularity Capillary refill time
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The Effect of Topologies and Refilling Short-chain PEG on Protein Adsorption 认领 引用 被引量：2
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作者 Chi Li Jia-Ning Zhang +1 位作者 Jing Jin Wei Jiang 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2023年第12期1879-1888,I0007,共10页
PEGylation is the gold standard for constructing protein resistance surfaces.Herein,grafting mPEG-SH and SH-PEG-SH with varied molecular weights(Mw=5K,10K,and 20K)on a gold chip,and the subsequent lysozyme adsorptions... PEGylation is the gold standard for constructing protein resistance surfaces.Herein,grafting mPEG-SH and SH-PEG-SH with varied molecular weights(Mw=5K,10K,and 20K)on a gold chip,and the subsequent lysozyme adsorptions of the PEG layers are evaluated using quartzcrystal microbalance based on dissipation(QCM-D).The lysozyme resistance depends on the features of grafting density and chain conformation,i.e.,linear and looped conformation.However,long-chain PEG(Mw≥10K)is insufficient to form a dense layer to resist protein due to large steric hindrances.Short-chain PEG(Mw=1K)with linear and looped structures is used to refill onto the long-chain PEG layer to increase the grafting density of PEGs and improve protein resistance.The refilling process and the subsequent protein adsorption depend on conformation rather than the density of the long-chain PEG substrate.Notably,the long-chain PEG looped substrates significantly improve protein resistance,attributing to the high viscoelasticity of the looped substrate and an increase in grafting density after refilling.Thus,refilling short-chain PEG improves protein resistance and the substrate conformation-dependence gives insight into the impact of topology,providing new ideas for how to increase chain density and select suitable topology to resist protein adsorption and demonstrating a potential application in biomedical fields. 展开更多
关键词 Poly(ethylene glycol) Refilling Protein adsorption Conformation QCM-D
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Hydroxyl spillover-driven dynamic refilling of oxygen vacancy in RuO2 via MoOx cluster for stable acid oxygen evolution reaction 认领 引用
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作者 Yuqi Yan Dongyue Xin +5 位作者 Qianqian Zhao Qinghai Ma Jiannan Du Fangmin Wu Guokang Han Chunyu Du 《Science China Chemistry》 SCIE EI CAS CSCD 2026年第6期3089-3097,共9页
Ruthenium dioxide(RuO2)is renowned for its exceptional catalytic activity toward the oxygen evolution reaction(OER),primarily attributed to the fast lattice oxygen mechanism(LOM).However,the LOM pathway included in... Ruthenium dioxide(RuO2)is renowned for its exceptional catalytic activity toward the oxygen evolution reaction(OER),primarily attributed to the fast lattice oxygen mechanism(LOM).However,the LOM pathway included in OER often leads to excessive oxidation of Ru and its subsequent dissolution,ultimately compromising the catalyst's long-term stability.In this work,to address the catalyst instability arising from the continuous accumulation of oxygen vacancies,which leads to structural breakdown,we propose a strategy that utilizes hydroxyl spillover to dynamically refill oxygen vacancies,effectively addressing the instability of catalysts caused by the continuous accumulation of oxygen vacancies during the OER.Engineered spatial coupling is achieved by anchoring MoOxclusters onto RuO2,resulting in a RuO2/MoOxcomposite catalyst capable of dynamically refilling oxygen vacancies under operating conditions.The RuO2/MoOxexhibits outstanding OER performance,delivering an ultra-low overpotential of 195 mV at 10 mA cm-2and maintaining excellent stability for over 1350 h under constant current operation.Moreover,a proton exchange membrane(PEM)electrolyzer employing RuO2/MoOxas the anode achieved stable operation for 200 h at 200 mA cm-2.Mechanistic studies show that the MoOxclusters act as a localized“hydroxyl pump”that preferentially adsorbs and activates hydroxyl intermediates.These intermediates then migrate to the RuO2surface,helping to refill the oxygen vacancy created during the OER process while maintaining the catalyst's structural stability.This study introduces a novel strategy for designing durable OER catalysts that function in acidic conditions and offers a new pathway to enhance the stability of Ru-based OER catalysts. 展开更多
关键词 oxygen evolution reduction hydroxyl spillover dynamic refilling oxygen vacancy Ru-based catalysts
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Impacts of wind conditions on hydrogen leakage during refilling hydrogen-powered vehicles 认领 引用 被引量：2
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作者 Lin Xie Yangyiming Rong +2 位作者 Jianye Chen Fang Yuan Rui Long 《Energy Storage and Saving》 2023年第2期449-458,共10页
Although hydrogen leakage at hydrogen refueling stations has been a concern,less efforts have been devoted to hydrogen leakage during the refueling of hydrogen-powered vehicles.In this study,hydrogen leakage and dilut... Although hydrogen leakage at hydrogen refueling stations has been a concern,less efforts have been devoted to hydrogen leakage during the refueling of hydrogen-powered vehicles.In this study,hydrogen leakage and dilution from the hydrogen dispenser during the refueling of hydrogen-powered vehicles were numerically investigated under different wind configurations.The shape,size,and distribution of flammable gas clouds(FGC)during the leakage and dilution processes were analyzed.The results showed that the presence of hydrogen-powered vehicles resulted in irregular FGC shapes.Greater wind speeds(v wv)were associated with longer FGC propagation distances.At vwv=2 m·s−1and 10 m·s−1,the FGC lengths at the end of the leakage were 7.9 m and 20.4 m,respectively.Under downwind conditions,higher wind speeds corresponded to lower FGC heights.The FGC height was larger under upwind conditions and was slightly affected by the magnitude of the wind speed.In the dilution process,the existence of a region with a high hydrogen concentration led to the FGC volume first increasing and then gradually decreasing.Wind promoted the mixing of hydrogen and air,accelerated FGC dilution,inhibited hydrogen uplifting,and augmented the horizontal movement of the FGC.At higher wind speeds,the low-altitude FGC movements could induce potential safety hazards. 展开更多
关键词 Hydrogen safe Wind condition Hydrogen refilling Hydrogen leakage
Effect of connection processes on mechanical properties of 7B04 aluminum alloy structures 认领 引用 被引量：5
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作者 Wang Yue Chai Peng +1 位作者 Guo Xiaojuan Qi Bojin 《China Welding》 CAS 2021年第2期50-57,共8页
The static and fatigue properties of 7B04 aluminum alloy structures connected by riveting and refill friction stir spot welding(refill FSSW)were compared and analyzed.Results show that the static compression load of t... The static and fatigue properties of 7B04 aluminum alloy structures connected by riveting and refill friction stir spot welding(refill FSSW)were compared and analyzed.Results show that the static compression load of the typical structure connected by riveting and refill FSSW fluctuated in the range of 117-124 kN,and the shear load was in the range of 89-95 kN.Welds spacing had a small influence on the static load of the structures joined by refill FSSW.However,the fatigue life of riveted structures was lower than that joined by refill FSSW.For the welded structure,the heterogeneous microstructures of the welded joint led to the uneven microhardness,and the hook at the lap interface bent upwards at the same time.These factors made the welded structures during the fatigue test failure along the path of sleeve moving. 展开更多
关键词 refill friction stir spot welding 7B04 aluminum alloy microstructure fatigue life fracture path
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Effect of thermo-mechanical conditions during constrained friction processing on the particle refinement of AM50 Mg-alloy phases 认领 引用 被引量：2
20
作者 Camila Caroline de Castro AndréMartins Neves Benjamin Klusemann 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2024年第6期2298-2311,共14页
Constrained Friction Processing(CFP)is a novel solid-state processing technique suitable for lightweight materials,such Mg-and Al-alloys.The technique enables grain size refinement to fine or even ultrafine scale.In t... Constrained Friction Processing(CFP)is a novel solid-state processing technique suitable for lightweight materials,such Mg-and Al-alloys.The technique enables grain size refinement to fine or even ultrafine scale.In this study,the effect of CFP on the microstructural refinement of AM50 rods is investigated in terms of particle size and morphology of the eutectic and secondary phases originally present in the base material,in particular the eutecticβ-Mg17Al12and Al-Mn phases.For that purpose,as-cast and solution heat-treated base material and processed samples were analyzed.The Al8Mn5 intermetallic phase was identified as the main secondary phase present in all samples before and after the processing.A notorious refinement of these particles was observed,starting from particles with an average equivalent length of a few micrometers to around 560 nm after the processing.The refinement of the secondary phase refinement is attributed to a mechanism analogous to the attrition comminution,where the combination of temperature increase and shearing of the material enables the continuous breaking of the brittle intermetallic particles into smaller pieces.As for the eutectic phase,the results indicate the presence of the partially divorcedβ-Mg17Al12particles exclusively in the as-cast base material,indicating that no further phase transformations regarding the eutectic phase,such as dynamic precipitation,occurred after the CFP.In the case of the processed as-cast material analyzed after the CFP,the thermal energy generated during the processing led to temperature values above the solvus limit of the eutectic phase,which associated with the mechanical breakage of the particles,enabled the complete dissolution of this phase.Therefore,CFP was successfully demonstrated to promote an extensive microstructure refinement in multiple aspects,in terms of grain sizes of theα-Mg phase and presence and morphology of the Al-Mn and eutecticβ-Mg17Al12. 展开更多
关键词 Constrained friction processing AM50 Refill friction stir spot welding Extrusion β-Mg17Al12 Al-Mn phases
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