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Nanometric polishing of lutetium oxide by plasma-assisted etching

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Advances in Manufacturing 2020年第4期8卷 440-446页

作者： Peng Lyu Min Lai feng-Zhou fang State key Laboratory of Precision Measuring Technology and Instruments Centre of Micro/Nano Manufacturing Technology(MNMT)Tianjin UniversityTianjin 300072People’s Republic of China Centre of Micro/Nano Manufacturing Technology(MNMTDublin) School of Mechanical and Materials EngineeringUniversity College Dublin.Dublin 4Ireland

Plasma-assisted etching,in which the irradiation of hydrogen plasma and inorganic acid etching are integrated,is proposed as a novel polishing method for sesquioxide *** means of this approach,low damage and even damage-free surfaces with a high material removal rate can be achieved in lutetium oxide surface *** of transmission electron microscopy and X-ray photoelectron spectroscopy reveal that plasma hydrogenation converts the sesquioxide into hydroxide,which leads a high efficient way to polish the *** influences of process conditions on the etching boundary and surface roughness are also qualitatively investigated using scanning electron microscope and white light *** newly developed process is verified by a systematic experiment.

关键词： Plasma-assisted etching Lutetium oxide Surface roughness Subsurface damage

Effects of iron phthalocyanine on the inner pressure of MH/Ni battery

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Science China Chemistry 2004年第3期47卷 235-239页

作者： WANG fang WU feng Beijing Institute of Technology National Development Center of Hi-Tech Green Materials Beijing 100081 China Beijing Institute of Technology National Development Center of Hi-Tech Green Materials Beijing 100081 China

Effects of iron phthalocyanine (FePc) on the inner pressure of MH/Ni batteries dur-ing charging were examined. Experimental results show that the battery with appropriate quantity of FePc displays a much lower inner pressure under charging and overcharging than the battery without FePc, especially the battery with 1 mg FePc exhibits the slowest increasing speed of inner pressure and the best charging efficiency and overchargeability.

关键词： inner pressure, MH/Ni batteries, iron phthalocyanine, hydrogen storage alloy, electrochemical catalyst.

Density of Na2O-Li2O-SiO2-B2O3 Molten Slag at 1 803-1 873K

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Journal of Iron and Steel Research International 2004年第4期11卷 15-18页

作者： XIAO feng fang Liang Chongqing Institute of Technology

The structural changes and reduction degree of chromite ore in blast furnace were studied by optical micrograph analysis, scanning electron microscope (SEM) and energy dispersive X-ray analysis (EDXA). The smelting re... 详细信息

关键词： smelting reduction chromite ore mechanism blast furnace

Ab initio Study on Ionization Energies of 1-Methyl-hypoxanthine

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Chinese Journal of Chemical Physics 2012年第5期25卷 540-544,I0003页

作者： ke-dong Wang Da-peng Yang Yu-fang Liu College of Physics and information Engineering Henan Normal UniversityXinxianE 453007China College of Mathematics and Information Science North China University of Water Resources andElectric PowerZhengzhou 450011China

Six low-lying tautomers of 1-methyl-hypoxanthine have been studied at the B3LYP/aug-cc- pVDZ level. Two tautomers NTH and N9H with the comparable energies are far more stable than the others. The vertical ionization energies of the tautomers calculated with ab initio electron propagator theory in the P3/aug-cc-pVDZ approximation are in agreement with the experimental data from photoelectron spectroscopy. According to the calculated relative energies and the comparison between the simulated and the experimental photoelectron spectra, it demonstrates that there are at least two tautomers of 1-methyl-hypoxanthine in the gas-phase experiments.

关键词： Tautomer Ionization energy Relative energy Photoelectron spectrum

Rational construction of NiCo2O4@Fe2O3 core-shell nanowire arrays for high-performance supercapacitors

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Progress in Natural Science:Materials International 2021年第1期31卷 19-24页

作者： ke Zhang Ze Cen fang Yang Kaibing Xu School of Mechanical and Automotive Engineering Shanghai University of Engineering Science Research Center for Analysis and Measurement Donghua University

Fe2O3electrode materials exhibit excellent electrochemical performance in electrochemical energy storage system. However, its poor electrical conductivity limits its future practical application. The binder-free Ni Co2O4@Fe2O3composites was reasonably designed and fabricated on carbon fiber paper with NiCo2O4nanowires as conductive scaffold in the present investigation. The three-dimensional nanostructure of the porous Fe2O3nanorods coated the Ni Co2 O4 nanowire arrays showed the fascinating electrochemical performance, including high specific capacitance of 262 m F/cm2 at a current density of 1 m A/cm2, and remarkable cycle stability with～74.2% capacitance retention after 4000 cycles. The excellent pseudocapacitance performance of NiCo2O4@Fe2O3composite materials is due to synergistic effect between NiCo2O4and Fe2O3. The results of the present work show that NiCo2O4@Fe2O3core-shell composite electrode is expected to exhibit excellent performance in the field of supercapacitors.

关键词： Core-shell NiCo 2 O 4 Fe 2 O 3 Supercapacitors Synergistic effect

An efficient method of addressing ectopic beats:new insight into data preprocessing of heart rate variability analysis

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2011年第12期12卷 976-982页

作者： feng WEN fang-tian HE College of Life Science Zhejiang University Hangzhou 310027 China ECG Department Sir Run Run Shaw Hospital School of Medicine Zhejiang University Hangzhou 310016 China

Heart rate variability(HRV) analysis is affected by ectopic *** efficient method was proposed to deal with the ectopic *** method was based on trend correlation of the heart timing *** of R-R interval(RRI) value at ectopic beat time was constructed by the weight calculation and the slope estimation of preceding normal *** type of ectopic beat was detected and replaced by the predictor of *** performance of the simulated signal after ectopic correction was tested by the standard value using power spectrum density(PSD) estimation,whereas the results of clinical data with ectopic beats were compared with the adjacent ectopic-free *** result showed the frequency indexes after ectopy corrected had less error than other methods with the test of simulated signal and clinical *** indicated our method could improve the PSD estimation in HRV *** method had advantages of high accuracy and real time properties to recover the sinus node modulation.

关键词： Frequency domain Ectopic beat Heart rate variability(HRV) Power spectrum density

Bernstein n-Widths for Classes of Convolution Functions with kernels Satisfying Certain Oscillation Properties

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Acta Mathematica Sinica,English Series 2009年第3期25卷 393-402页

作者： Guo feng Gen Sun fang School of Mathematical Sciences Beijing Normal University Laboratory of Mathematics and Complex Systems Ministry of Education Beijing 100875 P. R. China School of Mathematics and Information Engineering Taizhou University Taizhou 317000 P. R. China

In this paper, we consider some classes of 2π-periodic convolution functions Bp, and Kp with kernels having certain oscillation properties, which include the classical Sobolev class as special case. With the help of the spectral of nonlinear integral equations, we determine the exact values of Bernstein n-width of the classes Bp, Kp in the space Lp for 1 〈 p 〈 ∞.

关键词： Bernstein n-widths exact constants oscillation properties spectral of nonlinear integral equations

Wire and arc additive manufacturing of dissimilar 2319 and 5B06 aluminum alloys

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Journal of Materials Science & Technology 2022年第29期124卷 65-75页

作者： Tianxing Chang Xuewei fang Gang Liu Hongkai Zhang ke Huang State key Laboratory for Manufacturing Systems Engineering School of Mechanical EngineeringXi’an Jiaotong UniversityXi’an 710049China State key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China

Aluminum alloy is the most widely used light alloy at *** combining different types of aluminum alloys,their functional properties can be *** the present research,two components composed of 2319(Al-6.5Cu)and 5B06(Al-6.4Mg)dissimilar alloys were fabricated by wire and arc additive manufacturing(WAAM).The deposited component with the bottom half of 2319 and the top half of 5B06 exhibits better mechanical properties than its counterpart deposited vice *** ultimate tensile strength,yield strength,and elongation are 258.5 MPa,139.3 MPa,and 5.6%,respectively,which are only slightly inferior to the mechanical properties of 2319 base *** results show that for both components,fracture occurred at a layer thickness above the interface layer during the tensile test,regardless of the deposition *** appears that the thermal stress due to the long dwell time and the remelting of the S-AlCu Mg phase are the main factors promoting crack *** on the deposition order,cracks propagate either along the aggregated pores or stripθ-AlCu phase distributed along the grain *** analyzing the heat input and selecting the appropriate depositing order,the strength of WAAM dissimilar aluminum alloys can be effectively improved through the proper control of microstructure and internal defects.

关键词： Wire and arc additive manufacturing Dissimilar materials Defects Microstructure Mechanical Properties Aluminum alloy

Enhanced strength-ductility synergy of magnesium alloy fabricated by ultrasound assisted directed energy deposition

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Journal of Materials Science & Technology 2024年第11期178卷 247-261页

作者： Xinzhi Li Xuewei fang Mugong Zhang Binglin Wang ke Huang State key Laboratory for Manufacturing Systems Engineering School of Mechanical EngineeringXi'an Jiaotong UniversityXi'an 710049China

Investigations on the fabrication of large-size lightweight Mg alloy components by wire-arc directed en-ergy deposition(DED)are steadily ***,most of these components still suffer from inferior performance due to internal defects and inherent columnar ***,external ultrasound fields with different powers were successfully introduced into the wire-arc DED of AZ31 Mg *** microstructure,defects,and mechanical properties of the fabricated components were carefully charac-terized and *** results show that the external ultrasound fields lead to decreased porosity,complete columnar to equiaxed transition(CET),and enhanced ***,the UA90 samples exhibited a remarkable increase of~30%,~45%,and~189%in yield strength,ultimate tensile strength,and elongation,*** dominant mechanisms of enhanced strength-ductility synergy were analyzed in *** study thus sheds new light on wire-arc DED of Mg alloy components with excellent performance via external ultrasound fields.

关键词： Wire-arc directed energy deposition External ultrasound field Defects Microstructure evolution Strength-ductility synergy