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γ-MnO_(2) nanorod-assembled hierarchical micro-spheres with oxygen vacancies to enhance electrocatalytic performance toward the oxygen reduction reaction for aluminum-air batteries

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Journal of Energy Chemistry 2020年第12期29卷 81-89页

作者： Ge huo Xue-wan wang Zhi-Bin Zhang Zhongxin Song Xiao-Min Kang Ming-Xing Chen Qi wang Xian-Zhu Fu Jing-Li Luo College of Materials Science and Engineering Shenzhen UniversityShenzhen 518060GuangdongChina Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Optoelectronic Engineering.Shenzhen UniversityShenzhen 518060GuangdongChina Department of Chemical and Materials Engineering University of AlbertaEdmontonAlberta T6G 2G6Canada

γ-MnO2 nanorod-assembled hierarchical micro-spheres with abundant oxygen defects are synthesized by a simple thermal treatment approach as oxygen reduction electrocatalysts for Al(aluminum)-air batteries. The rich oxygen vacancies on the surface of γ-MnO2 are verified by morphology, structure,electron paramagnetic resonance(EPR) and X-ray photoelectron spectroscopy(XPS) results. The oxygen reduction reaction(ORR) electrocatalytic activity of γ-MnO2 is significantly improved by the incoming oxygen vacancies. The γ-MnO2 nanorod-assembled hierarchical micro-spheres calcined under 300 °C in Ar atmosphere show the best ORR performance. The primary Al-air batteries using γ-MnO2 catalysts as the cathode, which demonstrates excellent peal power density of 318 m w cm^(-2) when applying theγ-MnO2 catalysts with optimal amount of oxygen vacancies.

关键词： γ-MnO2 Oxygen vacancy ORR electrocatalysts Al-air battery

Dynamic behaviors and mitigation measures of a train passing through windbreak transitions from ground to cutting

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Journal of Central South University 2022年第8期29卷 2675-2689页

作者： CHEN Zheng-wei LIU Tang-hong GUO Zi-jian huo Xiao-shuai LIwen-hui XIAYu-tao Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina Key Laboratory of Traffic Safety on Track of Ministry of Education School of Traffic&Transportation EngineeringCentral South UniversityChangsha 410075China Joint International Research Laboratory of Key Technology for Rail Traffic Safety Changsha 410075China National&Local Joint Engineering Research Center of Safety Technology for Rail Vehicle Changsha 410075China

In this paper,the effects of a right-angle windbreak transition(RwT)from the flat ground to cutting on train aerodynamic and dynamic responses were investigated,then a mitigation measure,an oblique structure transition(OST)was proposed to reduce the impact of RwT on the train aerodynamic and dynamic *** results showed that in the RwT region,the airflow was divided into two *** part of the airflow induced a strong backflow in the flat ground position,and the other part of the airflow induced a strong backflow in the cutting ***,there were two lateral impacts on the *** the head car with the OST,the drop ratios of the peak-to-peak values compared with RwT were 47%,40%,and 52%for the side force coefficient C_(Fy),lift force coefficient C_(Fz) and overturning moment coefficient C_(Mx),*** the peak-to-peak value of the dynamic parameters,the drop ratios of OST compared with RwT were all larger than 50%.The maximum dynamic overturning coefficients for RwT and OST were 0.75 and 0.3,respectively.

关键词： high-speed train windbreak wall crosswind CFD train aerodynamics vehicle system dynamics

Leather waste as precursor to prepare bifunctional catalyst for alkaline and neutral zinc-air batteries

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Chinese Chemical Letters 2023年第6期34卷 594-597页

作者： Zeyu Zhu Jing Zhu Yangshen Chen Xinxin Liu Mengchun Zhang Mengxiao Yang Mengyu Liu Jiansheng wu Sheng Li Fengwei huo Key Laboratory of Flexible Electronics(KLOFE) Institute of Advanced Materials(IAM)Nanjing Tech UniversityNanjing 211816China School of Chemistry and Molecular Engineering Nanjing Tech UniversityNanjing 211816China

Carbon materials derived from biomass waste are considered as potential electrocatalysts for applications in zinc-air batteries(ZABs)due to their low cost and good catalytic ***,we reported the preparation of gel-based catalysts through utilizing hydrolyzed waste leather powder cross-linked with metallic salt *** calcination,iron-nickel alloy anchored in nitrogen-doped porous carbon catalysts(Fe Ni@NDC)was *** with commercial Pt/C catalyst,Fe Ni@NDC-800 exhibited lower E_(1/2)(0.77 V)and better *** importantly,the resulting Fe Ni@NDC-800-based alkaline ZABs achieved power density of 93.01 m w/cm^(2) and open circuit voltage of 1.45 V,which the Fe Ni@NDC-800-based neutral ZAB displayed a charge/discharge cycle stability of 275 *** work opens up the possibility of rational design and preparation of low-cost and high-performance electrocatalysts from recyclable leather waste.

关键词： Leather waste Zinc-air batteries Bifunctional electrocatalyst FeNi alloy Biomass

Investigation on heat-transfer-coefficient between aluminum alloy and organic/inorganic sand mold based on inverse method

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China Foundry 2019年第5期16卷 336-341页

作者： Jing-ying Sun Qi-chi Le Tong wang Xu Zhao wei-sen Shi Hong-wei huo Chiri wang Key Laboratory of Electromagnetic Processing of Materials Ministry of Education Northeastern University Shenyang 110819 China BMw Brilliance Automotive Ltd. Shenyang 100044 China ASK Chemicals (Zhenjiang) New Materials Technology Co Ltd. Shanghai 200032 China

A kind of cylinder sand mold was designed to investigate the heat-transfer-coefficients（HTCs） between aluminum alloy and organic/inorganic binder bonded sand mold during the solidification processes. Temperature during the solidification process was recorded and input into the simulation software. The inverse model of MAGMA was used to calculate the HTC based on the actual temperature. Results show that the temperature of the inorganic sand mold increased faster than the organic sand mold; while the temperature of the casting part with the inorganic sand mold decreased faster. The optimal HTCs between Al and the organic/inorganic sand mold are confirmed to be 300 to 700 and 1000 to 1800 w·m-2·K-1, respectively, along with the change of solid-liquid phase line. The simulated temperature curves show the same trend as the measured ones. The maximum deviation between the two temperature curves are 17.32 °C and 18.77 °C for castings by inorganic and organic sand molds.

关键词： heat-transfer-coefficient aluminum alloy organic inorganic inverse method

Protective Effect of Norcantharidin on Collagen-Induced Arthritis Rats

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Chinese Journal of Integrative Medicine 2018年第4期24卷 278-283页

作者： SHEN Hong-bo huo Ze-jun BAI Yun-jing HE Xiao-juan LI Chang-hong ZHAO Yu-kun GUO Qing-qing Department of Traditional Chinese Medicine Peking University Third Hospital Division of Rheumatology PLA Army General Hospital Institute of Basic Research in Clinical Medicine Academy of Chinese Medical Sciences Division of Rheumatology Peking University Third Hospital

Objective： To observe the effect of norcantharidin（NCTD） on collagen-induced arthritis（CIA） rats. Methods： Sixty Sprague-Dawley（SD） rats were randomly divided into 6 groups（n=10）： normal group, CIA model group（model group）, NCTD low-dose group [1.35 mg/（kg·d）], NCTD middle-dose group [2.7 mg/（kg·d）], NCTD high-dose group [5.4 mg/（kg·d）] and methotrexate（MTX） group [1.8 mg/（kg/w）]. Anesthetized rats were sacrificed by luxation of cervical vertebra after 4 weeks of administration. The arthritis scores were evaluated twice a week. The pathological changes in the ankle joints of rats were observed by hematoxylin-eosin（H＆E） staining. The serum levels of interleukin（IL） 1β, IL-6, tumor necrosis factor（TNF）-α, vascular endothelial growth factor（VEGF）, IL-17 and transform growth factor（TGF） β were detected by enzyme linked immunosorbent assay（ELISA）. The mRNA expression of retinoid-related orphan nuclear receptor γ t（ROR γ t） and forkhead box P3（Foxp3） in peripheral blood lymphocytes were confirmed by real-time polymerase chain reaction. Results： MTX and high-dose NCTD not only decreased the arthritis scores but also alleviated the pathological changes in CIA rats＇ ankle joints compared with the model group（P〈0.05 or P〈0.01）. All doses of NCTD significantly inhibited the serum levels of IL-6, IL-17 and TNF-α in CIA rats（P〈0.05）. Only middle-and high-dose of NCTD prominently decreased serum IL-1β and TGF-β levels of CIA rats（P〈0.05）. However, NCTD has no effect on vascular endothelial growth factor（VEGF） level in CIA rats. The Foxp3 mRNA expression in all NCTD groups were increased significantly than in the model group（P〈0.05）. The mRNA expression of RORγt in NCTD high-dose group was decreased apparently in comparison with the model group（P〈0.05）. Conclusion： NCTD showed therapeutic effect on CIA rats by inhibition of cytokines and regulation of Th17/Treg cells.

关键词： norcantharidin collagen-induced arthritis cytokine Th17/Treg forkhead box P3 retinoid related orphan nuclear receptor γt

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Ti微合金化对高锰钢组织和性能的影响

特殊钢 2024年第2期45卷 74-78页

作者：潘胡江杨新明李光强杨治争霍旭东安徽海螺川崎装备制造有限公司芜湖241136 武汉科技大学钢铁冶金及资源利用教育部重点实验室武汉430081

研究了Ti微合金化对Mn18钢组织和力学性能的影响,并分析了Mn18钢锤头失效的原因。结果表明,Ti微合金化在Mn18钢中具有细化晶粒、提高冲击韧性、伸长率、强度和硬度等作用,在Mn18钢加入0.10%和0.30%的w[Ti]时,随着Ti含量增加,高锰钢的硬... 详细信息

研究了Ti微合金化对Mn18钢组织和力学性能的影响,并分析了Mn18钢锤头失效的原因。结果表明,Ti微合金化在Mn18钢中具有细化晶粒、提高冲击韧性、伸长率、强度和硬度等作用,在Mn18钢加入0.10%和0.30%的w[Ti]时,随着Ti含量增加,高锰钢的硬度增大、强度提高,冲击韧性和延伸性也均呈优化趋势,继续增加w[Ti]至0.51%时,除布氏硬度继续增大外,KU2数值及稳定性、强度稳定性、伸长率等指标均出现下降趋势,高锰钢属于高氮奥氏体钢,加入Ti后迅速析出大量TiN,作为异质核心,起到系列有益作用,加入量过大,则TiN类夹杂物的尺寸过大,且出现局部聚集,将对Mn18钢的性能稳定性造成不利影响,也易于导致Mn18锤头断裂失效。在Mn18钢中使用Ti微合金化,为保证其有益效果,其含量不应超过0.30%。

关键词： Ti微合金化 Mn18高锰钢力学性能夹杂物失效

Development of a 750-mm-long stripline kicker for HEPS

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Radiation Detection Technology and Methods 2018年第2期2卷 121-127页

作者： H.Shi J.H.Chen L.wang N.wang L.H.huo G.w.wang P.Liu X.L.Shi Key Laboratory of Particle Acceleration Physics and Technology Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

Purpose The superfast kickers are required for the HEPS storage ring on-axis injection system due to its very small dynamic aperture.A 750-mm-long stripline pair type of kicker prototype was researched and developed to demonstrate achieved performance of bandwidth,impedance,kicker strength,field uniformity and beam power *** The cross sections of the kicker main body and the end of taper part are optimized for a good impedance matching and field uniformity.3D simulation further optimizes the taper part to minimize the beam power loss and maintain a lower *** high-voltage feedthrough is also designed and optimized by 3D *** and high-voltage measurements are taken to verify the design of kicker *** The testing transmission odd-mode impedance is 50±0.5Ω,the even-mode impedance is 60±0.5Ω,and return loss is less than−13 *** peak voltage and the rise time of pulse width inserting kicker assembly just decrease 3%of 20 kV and slow down 80 ps,*** RF testing results agree well with the simulation ones,which meet the design *** kicker assembly works well at±20 kV pulse.

关键词： Stripline kicker Feedthrough On-axis swap-out injection Odd-mode(even-mode)impedance Storage ring

PtCoNi ternary intermetallic compounds anchored on Co,Ni and N co-doped mesoporous carbon:Synergetic effect between PtCoNi nanoparticles and doped mesoporous carbon promotes the catalytic activity

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Journal of Energy Chemistry 2023年第3期78卷 340-349,I0010页

作者： Chaozhong Li weiyue Zhao Xueyi Lu Zhangsen Chen Bing Han Xiaorong Zhang Jiaxiang Chen Yijia Shao Junlang huo Yuexiang Zhu Yonghong Deng Shuhui Sun Shijun Liao The Key Laboratory of Fuel Cell Technology of Guangdong Province&The Key Laboratory of New Energy Technology of Guangdong Universities School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou 510641GuangdongChina School of Materials Sun Yat-sen UniversityShenzhen 518107GuangdongChina Centre énergie Matériaux et TélécommunicationsInstitute National de la Recherche ScientifiqueVarennesQuébec J3X 1P7Canada Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055GuangdongChina

Highly active and robust electrocatalysts are desired for proton exchange membrane fuel ***-based intermetallic compounds(IMCs) have been recognized as one of the most promising low-platinum catalysts for fuel cells(FCs).Herein,we report a high-performance IMCs by anchoring ordered PtCoNi ternary nanoparticles on the N,Co and Ni co-doped dodecahedral mesoporous carbon(DMC).while the introduced Co and Ni participate in the formation of PtCoNi IMCs,some of them are doped in the mesoporous carbon and coordinated by N to form Co-N_(y)/Ni-N_(z)dual active centers,which further enhances the electrocatalytic activity towards oxygen reduction ***,the addition of Ni results in a negative shift of the d-band center of Pt as compared to the Pt/DMC and Pt_(3)Co/DMC,making it easier to adsorb oxygen on the *** expected,our optimal sample Pt_(3)Co_(0.7)Ni_(0.3)/DMC exhibits excellent performance with mass activity and specific activity of 1.32 A mgPt-1and 1.98 mA cm^(-2)at 0.9 V,which are 7.33and 6.19 times that of commercial Pt/C,*** Pt_(3)Co_(0.7)Ni_(0.3)/DMC also reveals much better cathodic performance in an H2-air single fuel cell than commercial Pt/C catalyst with a power density of0.802 w cm^(-2).This work provides critical sights into constructing efficient catalysts by ternary intermetallic strategy and synergetic effect between active components and support.

关键词： Ternary intermetallic compounds Oxygen reduction reaction Fuel cell Catalyst

Separation of macro amounts of tungsten and molybdenum by ion exchange with D309 resin

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Transactions of Nonferrous Metals Society of China 2014年第9期24卷 3008-3013页

作者：卢晓颖霍广生廖春华中南大学冶金与环境学院长沙410083

Based on the difference in tendency to polymerize between tungsten and molybdenum, a new method using D309 resin was propounded. The batch tests indicate that the optimum pH value and contact time for the separation are 7.0 and 4 h respectively, the maxium separation factor of w and Mo is 9.29. And the experimental resules show that isothermal absorbing tungsten and molybdenum belongs to Langmuir model and Freundlich model respectively, and the absorbing kinetics for tungsten is controlled by intra-particle diffusion. with a solution containing 70 g/L wO3 and 28.97 g/L Mo, the effluent with a mass ratio of Mo to wO3 of 76 and the eluate with a mass ratio of wO3 to Mo of 53.33 are obtained after column test.

关键词： high concentrated tungstate and molybdenum solution ion exchange batch tests column tests