检索结果-南通市图书馆

Periodic Layered Structure Formed during Interfacial Reaction

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2016年第11期23卷 1127-1133页

作者： Xian-man ZHANG Hong-feng LUO liu-yong SHI Institute of Electrical and Mechanical Engineering Hainan University

A review of the periodic layered structure （PLS） formed during reactive diffusion was presented. The formation of PLS is a very interesting and complex phenomenon during the reactive diffusion process. It was firstly discovered occasionally. The formation of PLS has been reported in various solid state diffusion couples such as Zn/ Ni3 Si, Mg/SiO2, Zn/Cux Tiy and so on, and some controversial theoretical models and formation mechanism of PLS were put forward. However, there have been few reports about the PLS formed during hot dip. The development of PLS was reviewed, and the recent progress referring to the formation of PLS during the hot dip aluminizing of a no- vel Fe-Cr-B cast steel was especially introduced. However, not all of the borides could form PLS in their interracial reaction with molten Al. PLS only formed at the Cr-rich Fe2B/Al interface, while Mo-rich Fe2B fractured. A general qualitative description for the interracial reaction of Fe-Cr-B cast steel with molten Al was represented. Further inves- tigation on the constituents of the alternating phases and formation mechanism of PLS needs to be done. At last, the development trends of PLS were proposed.

关键词： periodic layered structure interfacial reaction reactive diffusion formation mechanism Fe-Cr-B cast steel

在线全文

学校读者我要写书评

暂无评论

玉米施肥量优化模型与土壤无机氮变化特征

玉米科学 2019年第6期27卷 145-152,159页

作者：仝利朋赵京考吴德亮宋佳珅宋丹丹刘沣漫东北农业大学资源与环境学院

对"3414"田间试验各处理玉米产量和不同氮水平(N0=0、N1=93.75、N2=187.5、N3=281.25 kg/hm^2)下测定土壤无机氮,探究N、P、K不同配比施肥对玉米产量的影响和不同氮水平下土壤无机氮的变化特征。结果表明,施氮对玉米产量的影响达到差异... 详细信息

对"3414"田间试验各处理玉米产量和不同氮水平(N0=0、N1=93.75、N2=187.5、N3=281.25 kg/hm^2)下测定土壤无机氮,探究N、P、K不同配比施肥对玉米产量的影响和不同氮水平下土壤无机氮的变化特征。结果表明,施氮对玉米产量的影响达到差异显著水平,施磷、钾肥对玉米产量的影响差异不显著。随着施氮量升高,玉米产量先升高后稳定,通过方差分析确定当地最佳推荐施氮量变化范围为93.75~281.25 kg/hm^2。施氮可以提高1 m土壤中铵态氮和硝态氮的积累量。铵态氮易被固定,拔节期以后,土壤中铵态氮积累较为稳定。硝态氮在土壤中变异较大,尤其在高施氮量(281.25 kg/hm^2)时,1 m土体中硝态氮积累量显著增加。无机氮总量与施氮量显著相关,当施氮量为281.25 kg/hm^2时,大大增加中期(抽雄期)氮素损失风险,确定安全施氮量处于187.5~281.25 kg/hm^2。提高产量、减少氮素损失的生产目标,207.27 kg/hm^2的施氮量为当地经济安全施氮量。

关键词：玉米优化模型推荐施肥量土壤无机氮

Effects of smelting parameters on the slag/metal separation behaviors of Hongge vanadium-bearing titanomagnetite metallized pellets obtained from the gas-based direct reduction process

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2018年第6期25卷 609-622页

作者： Cong feng man-sheng Chu Jue Tang Zheng-gen liu School of Metallurgy Northeastern University

Smelting separations of Hongge vanadium-bearing titanomagnetite metallized pellets（HVTMP）prepared by gas-based direct reduction were investigated,and the effects of smelting parameters on the slag/metal separation behaviors were *** mechanisms were elucidated using X-ray diffraction analysis,FACTSAGE 7.0 calculations,and scanning electron microscopy *** results show that,when the smelting temperature,time,and C/O ratio are increased,the recoveries of V and Cr of HVTMP in pig iron are improved,the recovery of Fe initially increases and subsequently decreases,and the recovery of Ti O_2 in slag *** the smelting Ca O/Si O_2 ratio is increased,the recoveries of Fe,V,and Cr in pig iron increase and the recovery of Ti O_2 in slag initially increases and subsequently *** appropriate smelting separation parameters for HVTMP are as follows：smelting temperature of 1873 K;smelting time of 30–50 min;C/O ratio of 1.25;and Ca O/Si O_2 ratio of *** these optimized parameters（smelting time：30 min）,the recoveries of Fe,V,Cr,and Ti O_2 are 99.5%,91.24%,92.41%,and 94.86%,respectively.

关键词： titanomagnetite vanadium chromium metallized pellets smelting separation recovery

Interfacial design of silicon/carbon anodes for rechargeable batteries:A review

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2023年第1期76卷 576-600,I0014页

作者： Quanyan man Yongling An Chengkai liu Hengtao Shen Shenglin Xiong Jinkui feng Key Laboratory for Liquid-Solid Structural Evolution&Processing of Materials(Ministry of Education) School of Materials Science and EngineeringShandong UniversityJinan 250061ShandongChina School of Chemistry and Chemical Engineering Shandong UniversityJinan 250100ShandongChina Shenzhen Institute of Shandong University Shenzhen 518057GuangdongChina

Silicon(Si)has been studied as a promising alloying type anode for lithium-ion batteries due to its high specific capacity,low operating potential and abundant ***,huge volume expansion during alloying/dealloying processes and low electronic conductivity of Si anodes restrict their electrochemical ***,carbon(C)materials with special physical and chemical properties are applied in Si anodes to effectively solve these *** review focuses on current status in the exploration of Si/C anodes,including the lithiation mechanism and solid electrolyte interface formation,various carbon sources in Si/C anodes,such as traditional carbon sources(graphite,pitch,biomass),and novel carbon sources(MXene,graphene,MOFs-derived carbon,graphdiyne,etc.),as well as interfacial bonding modes of Si and C in the Si/C ***,we summarize and prospect the selection of carbonaceous materials,structural design and interface control of Si/C anodes,and application of Si/C anodes in all-solid-state lithium-ion batteries and sodium-ion batteries et *** review will help researchers in the design of novel Si/C anodes for rechargeable batteries.

关键词： Silicon/carbon anodes Lithium-ion batteries Interfacial reaction Carbon sources Interface bonding

耕作与秸秆还田深度变化对不同土层团聚体稳定性的影响

在线全文

学校读者我要写书评

暂无评论

中国土壤与肥料 2024年第1期 1-7页

作者：于洪久王根林段衍刘峥宇时妍刘沣漫王伟邱广伟孙磊李玉梅黑龙江省黑土保护利用研究院农业农村部黑土地保护与利用重点实验室黑龙江哈尔滨150086 中国科学院合肥物质科学研究院安徽合肥230031 黑龙江省绥滨农场黑龙江绥滨156299 黑龙江北大荒现代农业服务集团有限公司宝泉岭分公司黑龙江佳木斯154211 黑龙江省农业科学院克山分院黑龙江齐齐哈尔161601

耕作和秸秆还田可以改变土壤理化性状,影响土壤团聚体的稳定性。采用田间定位试验,研究耕作与秸秆还田深度变化对旱地草甸土不同深度土层水稳性团聚体稳定性的影响,为科学开展秸秆还田培肥土壤提供依据。结果表明:土壤团聚体稳定性受>2... 详细信息

耕作和秸秆还田可以改变土壤理化性状,影响土壤团聚体的稳定性。采用田间定位试验,研究耕作与秸秆还田深度变化对旱地草甸土不同深度土层水稳性团聚体稳定性的影响,为科学开展秸秆还田培肥土壤提供依据。结果表明:土壤团聚体稳定性受>2000μm粒径大团聚体影响较大,连续5年翻耕显著降低了表层(0~20 cm)土壤>2000μm粒径水稳性大团聚体的占比,增加了53~250μm微团聚体和<53μm黏粉粒的比例。浅翻(ST)和秸秆浅翻还田(STS)与深翻(DT)和秸秆深翻还田(DTS)分别对10~20和20~30 cm土层黏粉粒的增加影响较大,其中,10~20 cm土层ST较免耕(NT)和DT处理分别增加86.21%和14.65%,20~30 cm土层DT较NT和ST处理分别增加113.82%和59.68%,差异显著(P<0.05);连续翻耕由于对亚耕层(20~40 cm)的频繁扰动,导致250~2000μm粒径团聚体的稳定性降低,DT较NT和ST与DTS处理较覆盖免耕(NTS)和STS处理分别平均降低19.43%与20.57%,且差异显著(P<0.05)。研究结果表明,连续相同耕作方式或秸秆还田方式不利于形成稳定的土壤团聚体结构,建议今后生产中采用轮耕轮还等保护性耕作方式调整秸秆还田深度,以达到改善土壤结构、提高团聚体稳定性、培肥土壤的目标。

关键词：秸秆还田耕作水稳性团聚体稳定性土壤深度

Development and progress on hydrogen metallurgy

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2020年第6期27卷 713-723页

作者： Jue Tang man-sheng Chu feng Li Cong feng Zheng-gen liu Yu-sheng Zhou School of Ferrous Metallurgy Northeastern UniversityShenyang 110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China

Hydrogen metallurgy is a technology that applies hydrogen instead of carbon as a reduction agent to reduce CO2 emission,and the use of hydrogen is beneficial to promoting the sustainable development of the steel *** metallurgy has numerous applications,such as H2reduction ironmaking in Japan,ULCORED and hydrogen-based steelmaking in Europe;hydrogen flash ironmaking technology in the US;HYBRIT in the Nordics;Midrex H2TM by Midrex Technologies,Inc.(United States);H2FUTURE by Voestalpine(Austria);and SALCOS by Salzgitter AG(Germany).Hydrogen-rich blast furnaces(BFs)with COG injection are common in *** BFs have been industrially tested by AnSteel,XuSteel,and *** a currently under construction pilot plant of a coal gasification–gas-based shaft furnace with an annual output of 10000 t direct reduction iron(DRI),a reducing gas composed of 57 vol%H2 and 38 vol%CO is prepared via the Ende *** life cycle of the coal gasification–gas-based shaft furnace–electric furnace short process(30 wt%DRI+70 wt%scrap)is assessed with 1 t of molten steel as a functional *** plant has a total energy consumption per ton of steel of 263.67 kg standard coal and a CO2 emission per ton of steel of 829.89 kg,which are superior to those of a traditional BF converter *** domestic materials and fuels,hydrogen production and storage,and hydrogen reduction characteristics,we believe that a hydrogen-rich shaft furnace will be suitable in *** production and storage with an economic and large-scale industrialization will promote the further development of a full hydrogen shaft furnace.

关键词： hydrogen hydrogen metallurgy blast furnace shaft furnace low carbon

Effects of MgO and TiO_2 on the viscous behaviors and phase compositions of titanium-bearing slag

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2016年第8期23卷 868-880页

作者： Cong feng man-sheng Chu Jue Tang Jin Qin feng Li Zheng-gen liu School of Metallurgy Northeastern University

The effects of MgO and TiO_2 on the viscosity, activation energy for viscous flow, and break-point temperature of titanium-bearing slag were studied. The correlation between viscosity and slag structure was analyzed by Fourier transform infrared（FTIR） spectroscopy. Subsequently, main phases in the slag and their content changes were investigated by X-ray diffraction and Factsage 6.4 software package. The results show that the viscosity decreases when the MgO content increases from 10.00wt% to 14.00wt%. Moreover, the break-point temperature increases, and the activation energy for viscous flow initially increases and subsequently decreases. In addition, with increasing TiO_2 content from 5.00wt% to 9.00wt%, the viscosity decreases, and the break-point temperature and activation energy for viscous flow initially decrease and subsequently increase. FTIR analyses reveal that the polymerization degree of complex viscous units in titanium-bearing slag decreases with increasing MgO and TiO_2 contents. The mechanism of viscosity variation was elucidated. The basic phase in experimental slags is melilite. Besides, as the MgO content increases, the amount of magnesia–alumina spinel in the slag increases. Similarly, the sum of pyroxene and perovskite phases in the slag increases with increasing TiO_2 content.

关键词： ironmaking blast furnace slag viscous properties phase composition magnesium oxide titanium dioxide

Chro-austempering treatment of a medium-carbon high-strength bainitic steel

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2023年第2期30卷 317-327页

作者： man liu Jun-yu Tian feng Cai Cheng-gang Pan Guang Xu The State Key Laboratory of Refractories and Metallurgy The Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of EducationThe Collaborative Innovation Center for Advanced Steels of Ministry of EducationWuhan University of Science and TechnologyWuhan430081HubeiChina Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking Wuhan University of Science and TechnologyWuhan430081HubeiChina

The integrated processing of chromizing and austempering(termed chro-austempering)treatments was *** microstructure and properties of a medium-carbon high-strength bainitic steel treated by chro-austempering treatments were investigated by metallography,scanning vibrating electrode technique,electrochemical workstation,and microhardness *** results show that the high-strength bainitic steel with carbide-free bainite as matrix and the chromized layers on surfaces was successfully fabricated by chro-austempering *** hardness of surface layers was about 3.5 times that of the bainite ***,the corrosion started from exposed bainitic matrix and proceeded along the depth direction,testifying that the surface corrosion resistance was significantly improved by chro-austempering treatment due to the formation of Cr_(7)C_(3)and(Cr,Fe)7_(7)C_(3)on the surface.

关键词： Chro-austempering Chromizing Austempering Bainitic transformation Corrosion resistance Hardness High-strength bainitic steel

Asymmetric Synthesis of the Ring A Substructure of Genkwadane A

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2018年第9期36卷 831-836页

作者： Jing feng Hongli Yin Yi man Shaomin Fu BO liu Key Laboratory of Green Chemistry & Technology of Ministry of Education College of Chemistry Sichuan University Chengdu Sichuan 610064China

A practical approach to the asymmetric synthesis of the ring A substructure of genkwadane A, a daphnane diterpenoid, was developed. This synthesis features the Mukaiyama aldol reaction to introduce the quaternary stereogenic center at C4 and VO（acac）2-catalyzed Jackson-Ellman-Bolrn sulfoxidation to deliver the corresponding sulfoxide. The Dieckmann-type condensation was efficiently promoted by KHMDS and the ring A substructure was finally accomplished through Barton iodination condition.

关键词： genkwadane A daphnane Mukaiyama aldol sulfoxidation Dieckmann-type condensation