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Optimization of flow field in electrochemical trepanning of integral cascades(Ti6Al4V)

Chinese Journal of Aeronautics 2022年第10期35卷 354-364页

作者： Gaopan LEI Dong ZHU Jiabao Li College of Mechanical&Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Ti6Al4V is widely applied in the integral cascades of aero engines.As an effective machining method,electrochemical trepanning(ECTr)has unique advantages in processing surface parts made of hard-to-cut materials.In ECTr,the state of the flow field has a significant effect on processing stability and machining quality.To improve the uniformity of the flow field when ECTr is applied to Ti6Al4V,two different flow modes are designed,namely full-profile electrolyte supply(FPES)and edges electrolyte supply(EES).Different from the traditional forward flow mode,the flow directions of the electrolyte in the proposed modes are controlled by inlet channels.Simulations show that the flow field under EES is more uniform than that under FPES.To further enhance the uniformity of the flow field,the structure of EES is optimized by modifying the insulating sleeve.In the optimized configuration,the longitudinal distance between the center of the inlet hole and the center of the blade is 6.0 mm,the lateral distance between the centers of the inlet holes on both sides is 16.5 mm,the length to which the electrolyte enters the machining area is 1.5 mm,and the height of the insulating sleeve is 13.5 mm.A series of ECTr experiments are performed under the two flow modes.Compared with EES,the blade machined by FPES is less accurate and has poorer surface quality,with a surface roughness(R_(a))of 3.346μm.Under the optimized EES,the machining quality is effectively enhanced,with the surface quality improved from R_(a)=2.621μm to R_(a)=1.815μm,thus confirming the efficacy of the proposed methods.

关键词： Edges electrolyte supply Electrochemical trepanning Flow field Structure optimization Surface quality

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Self-healing ability of Prussian blue analogs for aqueous potassium-ion batteries

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Science Bulletin 2023年第3期68卷 240-242页

作者： Quan Yuan Jiabao Li Jingjing Hao Ruoxing Wang Jinliang li School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002China Siyuan Laboratory Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New MaterialsGuangdong Provincial Key Laboratory of Nanophotonic ManipulationDepartment of PhysicsJinan UniversityGuangzhou 510632China

The slow reaction kinetics,combined with the relatively large radius of K-ion,makes it challenging to develop acceptable electrode materials for reversible insertion/deinsertion of potassium ions,thus reducing the cycle stability and reversible capacity of aqueous potassium-ion batteries(PIBs)[1].Given this,there is still a long way to go in developing high-performance electrode materials for PIBs with a stable cycle life and high energy density.According to a literature study on PIB electrode materials,the electrochemical performance of cathode materials can be easily achieved through various structural modifications[2–4].Nevertheless,the study of cathode material optimization and operating mechanisms is insufficient,hindering the energy density of PIBs from reaching a satisfactory level.In this context,the performance of cathode material becomes the decisive factor for the performance of PIBs.

关键词： insertion electrode potassium

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Identification of unknown disinfection byproducts in drinking water produced from Taihu Lake source water

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Journal of Environmental Sciences 2022年第3期34卷 1-11页

作者： Jiabao Li Haifeng Zhang Juan Wang Zhiyong Yu Hongyan li Min Yang Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesUniversity of Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

Although disinfection byproducts(DBPs) in drinking water have been suggested as a cancer causing factor, the causative compounds have not yet been clarified. In this study, we used liquid chromatography quadrupole-time-of-flight spectrometry(LC-QTOF MS) to identify the unknown disinfection byproducts(DBPs) in drinking water produced from Taihu Lake source water, which is known as a convergence point for the anthropogenic pollutants discharged from intensive industrial activities in the surrounding regions. In total, 91 formulas of DBPs were discovered through LC-QTOF MS nontarget screen, 81 of which have not yet been reported. Among the 91 molecules, 56 only contain bromine, 15 only contain chlorine and 20 DBPs have both bromine and chlorine atoms. Finally, five DBPs including 2,4,6-tribromophenol, 2,6-dibromo-4-chlorophenol, 2,6-dichloro-4-bromophenol, 4-bromo-2,6-di-tert-butylphenol and 3,6-dibromocarbazole were confirmed using standards. The former three compounds mainly formed in the predisinfection step(maximum concentration, 0.2-2.6 μg/L), while the latter two formed in the disinfection step(maximum concentration, 18.2-33.6 ng/L). In addition, 19 possible precursors of the discovered DBPs were detected, with the aromatic compounds being a major group. 2,6-di-tert-butylphenol as the precursor of 4-bromo-2,6-di-tert-butylphenol was confirmed with standard, with a concentration of 20.3 μg/L in raw water. The results of this study show that brominated DBPs which are possibly formed from industrial pollutants are relevant DBP species in drinking water produced form Taihu source water, suggesting protection of Taihu Lake source water is important to control the DBP risks.

关键词： Source water Disinfection byproducts Brominated disinfection byproducts Nontarget analysis Precursors Source water pollution

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Boosted electrochemical performance of Na_(3)V_(2)(PO_(4))_(3) at low temperature through synergistical F substitution and construction of interconnected nitrogen-doped carbonaceous network

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Journal of Materials Science & Technology 2023年第19期150卷 159-167页

作者： Jiabao Li Ziqian li Shaocong Tang Tianyi Wang likun Pan Chengyin Wang School of Chemistry and Chemical Engineering Yangzhou University180 Si-Wang-Ting RoadYangzhouJiangsu 225002China Shanghai key laboratory of Magnetic Resonance School of Physics and Electronic ScienceEast China Normal UniversityShanghai 200062China

Benefitting from its unique NASICON-type framework,the Na_(3)V_(2)(PO_(4))_(3)(NVP)cathodes have aroused extensive interest and have been deemed as the promising cathode candidate for sodium-ion batteries(SIBs).Unfortunately,the poor electronic conductivity,combined with the undesirable volume variations,seriously hinders the practical application of NVP cathode,especially at low temperatures.Herein,a dual-strategy,F substitution accompanied by V vacancies and the construction of three-dimensional(3D)nitrogen-doped carbonaceous frameworks(NC),were employed for the NVP cathode(F-NVP/C@3DNC).The former can remarkably decrease the particle size and enhance Na^(+)migration capability,increasing the ionic conductivity.Meanwhile,the electronic connection and effective buffering can be obtained from the latter,strengthening the electrode integrity.Consequently,up to 100 cycles at 0.1 A g^(-1),a reversible capacity of 113.8 mAh g^(-1),approaching the theoretical value(117 mAh g^(-1)),is demonstrated,accompa-nied by impressive capacity retentions at 1.0(93.75%after 4800 cycles)and 20.0 A g^(-1)(92.7%after 1000 cycles).More importantly,even at-20℃,a superior specific capacity(102.6 mAh g^(-1) after 100 cycles at 0.1 A g^(-1))and high capacity retention(86.6%at 20.0 A g^(-1) up to 1000 cycles)can still be obtained simul-taneously.Significantly,the design of F-NVP/C@3DNC provides insights for the fabrication of polyanion cathodes for applications at low temperatures with modified structure stability and reaction kinetics.

关键词： Na_(3)V_(2)(PO_(4))_(3) F substitution Interconnected carbonaceous frameworks Ionic/electronic conductivity Performance at low temperature

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Overexpression of programmed cell death-1 (PD-1) affects circulatory Th1 and Th2 cells in patients with cardiac arrest in the early period after the return of spontaneous circulation

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Chinese Medical Journal 2022年第1期135卷 95-97页

作者： Yanan Yu Miaorong Xie Jiabao Li Chenchen Hang Fei Shao Chunsheng li Department of Emergency Medicine Beijing Friendship HospitalCapital Medical UniversityBeijing 100020China Department of Critical Care Medicine Beijing Friendship HospitalCapital Medical UniversityBeijing 100020China Department of Emergency Medicine Beijing Chaoyang HospitalCapital Medical UniversityBeijing 100020China

To the Editor:Cardiac arrest(CA)is the leading cause of morbidity and mortality among hospitalized patients globally and has low rates of overall survival.After the return of spontaneous circulation(ROSC),patients with CA and systemic ischemia/reperfusion injury can manifest as sepsis-like syndromes and immune disorders that increase the risk of infections.CD4^(+)T lymphocytes play an important role in organ ischemia-reperfusion injury.T-helper(Th)types 1 and 2 cells are classical subsets of CD4^(+)T cells.Extensive research on their functions in infectious and immune-related inflammatory diseases indicates that both subsets participate in host defense and direct immune responses.Data from CA/cardiopulmonary resuscitation porcine models and patients have revealed imbalances in Th1/Th2 cell ratio.[1]Therefore,Th1 and Th2 cells are important for understanding post-ROSC immune dysfunction in patients with CA.

关键词： Th1/Th2 patients Th2

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In-situ electro-polymerization of L-tyrosine enables ultrafast,long cycle life for lithium metal battery

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Chinese Chemical Letters 2023年第5期34卷 561-566页

作者： Zihao Chu Sidong Zhuang Jiahui Lu Jiabao Li Chengyin Wang Tianyi Wang College of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002China

The growth of dendrites in the lithium(li)metal anode hinders the commercialization of lithium metal batteries(LMBs).Electrolyte additives have proved to be an effective way to solve the problem of dendrites and improve the coulombic efficiency.Herein,we propose a strategy of using L-tyrosine(L-Tyr)as an additive to protect the lithium metal anode in situ,where L-Tyr can be electropolymerized in situ to form an ordered array of nanosheets on the surface of the lithium metal anode to uniformly deposit lithium ions.At the same time,the addition of L-Tyr changed the structure of the solvent in the electrolyte,because the carboxyl group on L-Tyr make DME form hydrogen bonds easily.Besides,the reduction of free DME makes more TFSI-involved in the formation of the SEI film on the electrode surface,which increases the proportion of liF in the SEI film.With 2 wt%L-Tyr,li||li symmetric cells superior cycle stability in ether electrolytes,li|Cu cells y improved stability up to 200 cycles with an average CE of 93.1%in ether electrolytes and li||li_(4)Ti_(5)O_(12)(LTO)demonstrated an excellent cycling capabilitie with 119 mAh/g capacity retention by the 5000^(th)cycle.

关键词： lithium metal battery Tyrosine In situ Eelectropolymerization lithium dendrite

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Flexible sodium-ion capacitors boosted by high electrochemicallyreactive and structurally-stable Sb_(2)S_(3)nanowire/Ti_(3)C_(2)Tx MXene film anodes

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Nano Research 2023年第4期16卷 5592-5600页

作者： Jian Yang Tianyi Wang Xin Guo Xiaoxue Sheng Jiabao Li Chengyin Wang Guoxiu Wang Institute for Innovative Materials and Energy Faculty of Chemistry and Chemical EngineeringYangzhou UniversityYangzhou 225002China Centre for Clean Energy Technology School of Mathematics and PhysicsFaculty of ScienceUniversity of Technology SydneySydneyNSW 2007Australia

The rapid development of portable,foldable,and wearable electronic devices requires flexible energy storage systems.Sodiumion capacitors(SICs)combining the high energy of batteries and the high power of supercapacitors are promising solutions.However,the lack of flexible and durable electrode materials that allow fast and reversible Na+storage hinders the development of flexible SICs.Herein,we report a high-capacity,free-standing and flexible Sb2S3/Ti_(3)C_(2)Tx composite film for fast and stable sodium storage.In this hybrid nano-architecture,the Sb_(2)S_(3)nanowires uniformly anchored between Ti_(3)C_(2)Tx nanosheets not only act as sodium storage reservoirs but also pillar the two-dimensional(2D)Ti_(3)C_(2)Tx to form three-dimensional(3D)channels benefiting for electrolyte penetration.Meanwhile,the highly conductive Ti_(3)C_(2)Tx nanosheets provide rapid electron transport pathways,confine the volume expansion of Sb_(2)S_(3)during sodiation,and restrain the dissolution of discharged sodium polysulfides through physical constraint and chemical absorption.Owing to the synergistic effects of the one-dimensional(1D)Sb_(2)S_(3)nanowires and 2D MXenes,the resultant composite anodes exhibit outstanding rate performance(553 mAh·g−1 at 2 A·g−1)and cycle stability in sodium-ion batteries.Moreover,the flexible SICs using Sb2S3/Ti_(3)C_(2)Tx anodes and active carbon/reduced graphene oxide(AC/rGO)paper cathodes deliver a superior energy and power density in comparison with previously reported devices,as well as an excellent cycling performance with a high capacity retention of 82.78%after 5,000 cycles.This work sheds light on the design of next-generation low-cost,flexible and fast-charging energy storage devices.

关键词： MXene Sb_(2)S_(3)nanowires flexible energy storage devices sodium-ion batteries sodium-ion capacitors

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Interface Engineering of Fe_(7)S_(8)/FeS_(2) Heterostructure in situ Encapsulated into Nitrogen‑Doped Carbon Nanotubes for High Power Sodium‑Ion Batteries

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Nano-Micro Letters 2023年第8期15卷 167-180页

作者： Penghao Song Jian Yang Chengyin Wang Tianyi Wang Hong Gao Guoxiu Wang Jiabao Li College of Chemistry and Chemical Engineering Yangzhou University180 Si‑Wang‑Ting RoadYangzhou 225002JiangsuPeople’s Republic of China Centre for Clean Energy Technology Faculty of ScienceUniversity of Technology SydneyPO Box 123BroadwayNSW 2007Australia Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education College of Chemistry and Chemical EngineeringJiangxi Normal UniversityNanchang 330022People’s Republic of China

Heterostructure engineering combined with carbonaceous materials shows great promise toward promoting sluggish kinetics,improving electronic conductivity,and mitigating the huge expansion of transition metal sulfide electrodes for high-performance sodium storage.Herein,the iron sulfide-based heterostructures in situ hybridized with nitrogen-doped carbon nanotubes(Fe_(7)S_(8)/FeS_(2)/NCNT)have been prepared through a successive pyrolysis and sulfidation approach.The Fe_(7)S_(8)/FeS_(2)/NCNT heterostructure delivered a high reversible capacity of 403.2 mAh g^(−1) up to 100 cycles at 1.0 A g^(−1) and superior rate capability(273.4 mAh g^(−1) at 20.0 A g^(−1))in ester-based electrolyte.Meanwhile,the electrodes also demonstrated long-term cycling stability(466.7 mAh g^(−1) after 1,000 cycles at 5.0 A g^(−1))and outstanding rate capability(536.5 mAh g^(−1) at 20.0 A g^(−1))in ether-based electrolyte.This outstanding performance could be mainly attributed to the fast sodium-ion diffusion kinetics,high capacitive contribution,and convenient interfacial dynamics in ether-based electrolyte.

关键词： Iron sulfides Heterostructure Nitrogen-doped carbon nanotubes Ester-based electrolyte Ether-based electrolyte

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Energy-efficient task allocation for reliable parallel computation of cluster-based wireless sensor network in edge computing

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Digital Communications and Networks 2023年第2期9卷 473-482页

作者： jiabao Wen Jiachen Yang Tianying Wang Yang li Zhihan Lv School of Electrical and Information Engineering Tianjin UniversityTianjin300072China College of Mechanical and Electrical Engineering Shihezi UniversityXinjiang832003China School of Data Science and Software Engineering Qingdao UniversityQingdao266000China

To efficiently complete a complex computation task,the complex task should be decomposed into subcomputation tasks that run parallel in edge computing.Wireless Sensor Network(WSN)is a typical application of parallel computation.To achieve highly reliable parallel computation for wireless sensor network,the network's lifetime needs to be extended.Therefore,a proper task allocation strategy is needed to reduce the energy consumption and balance the load of the network.This paper proposes a task model and a cluster-based WSN model in edge computing.In our model,different tasks require different types of resources and different sensors provide different types of resources,so our model is heterogeneous,which makes the model more practical.Then we propose a task allocation algorithm that combines the Genetic Algorithm(GA)and the Ant Colony Optimization(ACO)algorithm.The algorithm concentrates on energy conservation and load balancing so that the lifetime of the network can be extended.The experimental result shows the algorithm's effectiveness and advantages in energy conservation and load balancing.

关键词： Wireless sensor network Parallel computation Task allocation Genetic algorithm Ant colony optimization algorithm Energy-efficient Load balancing

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Effects of process parameters on the growth behavior and granule size distribution of iron ore mixtures in a novel high-shear granulator

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International Journal of Minerals,Metallurgy and Materials 2022年第12期29卷 2152-2161页

作者： Yang You jiabao Guo Gang li Zhuang Zheng Yong li Xuewei Lü College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Chongqing Key Laboratory of Vanadium–Titanium Metallurgy and New Materials Chongqing UniversityChongqing 400044China

This work proposes a novel horizontal high-shear granulator for iron ore granulation before sintering process.The granulation behavior such as growth process and structure of granules were firstly analyzed,followed by the effects of operation conditions such as water content,initial particle size distribution,and the concentrate ratio.The results show that the granule size increased significantly with increasing the granulation time,and the structure of granule can be divided into three types:non-nuclei,single-nuclei,and multi-nuclei.Water promotes the coalescence and growth of particles,and a better granulation performance was obtained at the water content of 8.8wt%under the current raw material conditions.Increasing the nuclei particle ratio led to an increase in average size of granules and permeability of the granules bed,but a decrease in growth index.Besides,with increasing of concentrate ratio,granulation performance such as granule size,bed permeability,and uniformity became worse.

关键词： horizontal high-shear granulation iron ore granule structure granulation performance size distribution

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