检索结果-南通市图书馆

Consolidation mechanism of fluxed hematite pellets

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

Journal of Iron and Steel Research International 2022年第10期29卷 1526-1534页

作者： Hao Wu Tie-jun Chun Ping Wang song zhou Tian-bao zhou School of Metallurgical Engineering Anhui University of TechnologyMa’anshan243002AnhuiChina

Fluxed pellets are becoming a popular burden for the blast furnace in *** basicity(wCaO/wSiO_(2))ranging from 0.33 to 1.33 was prepared by adding CaO analytical *** phase change of pellets during roasting was analyzed by the FactSage software,and the consolidation mechanism of fluxed hematite pellets was also *** results show that the increase in basicity gradually increases the diameter,volume,and porosity of *** diameter,volume,and porosity of pellets change slightly when the basicity is greater than *** increase in roasting temperature gradually decreases the volume and porosity of *** the increase in pellet basicity,the compressive strength of pellets reaches the maximum at the basicity of *** higher the roasting temperature is,the more the slag phase is produced,thereby accelerating Fe^(3+)diffusion and promoting Fe_(2)O_(3) *** addition,the consolidation effect of the slag phase after cooling improves the consolidation strength of fluxed *** the basicity is higher than 0.83,the slag phase decreases with the increase in basicity,and the high-temperature solid solution,such as melilite and spinel,increases,thereby hindering Fe2O3 recrystallization.

关键词： Fluxed pellet Consolidation Porosity Recrystallization Basicity

Uniqueness and Radial Symmetry of Least Energy Solution for a Semilinear Neumann Problem

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

Acta Mathematicae Applicatae Sinica 2008年第3期24卷 473-482页

作者： Zheng-ping Wang Huan-song zhou Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences P.O.Box 71010 Wuhan 430071 China

Consider the following Neumann problem d△u- u ＋ k（x）u^p = 0 and u 〉 0 in B1, δu/δv =0 on OB1,where d 〉 0, B1 is the unit ball in R^N, k（x） = k（｜x｜） ≠ 0 is nonnegative and in C（-↑B1）, 1 〈 p 〈 N＋2/N-2 with N≥ 3. It was shown in [2] that, for any d 〉 0, problem （＊） has no nonconstant radially symmetric least energy solution if k（x） ≡ 1. By an implicit function theorem we prove that there is d0 〉 0 such that （＊） has a unique radially symmetric least energy solution if d 〉 d0, this solution is constant if k（x） ≡ 1 and nonconstant if k（x） ≠ 1. In particular, for k（x） ≡ 1, do can be expressed explicitly.

关键词： Implicit function theorem least energy solution radial symmetry Neumann problem elliptic

Copositive approximation by rational functions with prescribed numerator degree

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics(A Journal of Chinese Universities) 2009年第4期24卷 411-416页

作者： YU Dan-sheng zhou song-ping Department of Mathematics Hangzhou Normal University Hangzhou 310036 China Department of Mathematics Statistic and Computer Science St. Francis Xaiver University Antigonish Nova Scotia Canada B2G 2W5 Institute of Mathematics Zhejiang Sci-Tech University Hangzhou 310028 China

The paper proves that, if f（x） ∈ L^p[-1,1],1≤p〈∞ ,changes sign I times in （-1, 1）,then there exists a real rational function r（x） ∈ Rn^（2μ-1）l which is eopositive with f（x）, such that the following Jackson type estimate ｜｜f-r｜｜p≤Cδl^2μωφ（f,1/n）p holds, where μ is a natural number ≥3/2＋1/p, and Cδ is a positive constant depending only on δ.

关键词： copositive approximation rational functions approximation rate

Corrosion Resistance of Sintered NdFeB Permanent Magnet With Ni-P/TiO_2 Composite Film

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2009年第3期16卷 89-94页

作者： song Lai-zhou YANG Zhi-yong Department of Environment and Chemical Engineering Yanshan University Qinhuangdao 066004 HebeiChina Central Iron and Steel Research Institute Beijing 100081 China

The Ni-P/TiO2 composite film on sintered NdFeB permanent magnet was investigated by X-ray diffraction （XRD）,environmental scanning electron microscopy （ESEM）,and energy dispersive X-ray spectrometer （EDX）. The corrosion resistance of Ni-P/TiO2 film coated on NdFeB magnet,in 0.5 mol/L NaCl solution,was studied by potentiodynamic polarization,salt spray test and electrochemical impedance spectroscopy （EIS） techniques. The self-corrosion current density （icorr） and the polarization resistance （Rp） of Ni-P/TiO2 film are 0.22 μA/cm2 （about 14% of that of Ni-P coating）,and 120 kΩ·cm2 （about 2 times of that of Ni-P coating）,respectively. The anti-salt spray time of Ni-P/TiO2 film is about 2.5 times of that of the Ni-P coating. The results indicate that Ni-P/TiO2 film has a better corrosion resistance than Ni-P coating,and the composite film increases the corrosion resistance of NdFeB magnet markedly.

关键词： sintered NdFeB permanent magnet Ni-P/TiO2 composite film sodium chloride solution corrosion resistance

A Variational ODE and its Application to an Elliptic Problem

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2007年第4期23卷 685-696页

作者： Huan-song zhou Hong-bo Zhu Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences P.O. Box 71010 Wuhan 430071 China

In this paper, we consider the following ODE problem { （-u＂（τ）＋（N-1）（N-3）/4τ^2 ）u（τ）＋λu（τ）=f（τ,τ（1-N）/2 u）u（τ）,τ〉0, u∈H, N≥3. （P）,where f ∈ C（（0,＋∞） ×R,R）, f（τ,s） goes t... 详细信息

In this paper, we consider the following ODE problem { （-u＂（τ）＋（N-1）（N-3）/4τ^2 ）u（τ）＋λu（τ）=f（τ,τ（1-N）/2 u）u（τ）,τ〉0, u∈H, N≥3. （P）,where f ∈ C（（0,＋∞） ×R,R）, f（τ,s） goes to p（τ） and q（τ） uniformly in τ 〉 0 as s→ 0 and s→＋∞ respectively, 0≤ p（τ） ≤ q（τ） ∈L^∞（0,∞）. Moreover, for τ 〉 0, f（τ, s） is nondecreasing in s≥ 0. Some existence and non-existence of positive solutions to problem （P） are proved without assuming that p（τ） = 0 and q（τ） has a limit at infinity. Based on these results, we get the existence of positive solutions for an elliptic problem.

关键词： Elliptic equation asymptotically linear mountain pass theorem

Intriguing magnetoelectric effect in two-dimensional ferromagnetic/perovskite oxide ferroelectric heterostructure

在线全文

学校读者我要写书评

暂无评论

npj Computational Materials 2022年第1期8卷 121-127页

作者： Ping Li Xue-song zhou Zhi-Xin Guo State Key Laboratory for Mechanical Behavior of Materials Center for Spintronics and Quantum SystemSchool of Materials Science and EngineeringXi’an Jiaotong UniversityXi’anShaanxi710049China Key Laboratory for Computational Physical Sciences(Ministry of Eduction) Fudan UniversityShanghai200433China Key Laboratory of Polar Materials and Devices(Ministry of Education) East China Normal UniversityShanghai200241China

Two-dimensional (2D) magnets have broad application prospects in the spintronics,but how to effectively control them with a small electric field is still an *** we propose that 2D magnets can be efficiently controlled in a multiferroic heterostructure composed of 2D magnetic material and perovskite oxide ferroelectric (POF) whose dielectric polarization is easily flipped under a small electric *** illustrate the feasibility of such strategy in the bilayer CrI_(3)/BiFeO_(3)(001) heterostructure by using the first-principles *** from the traditional POF multiferroic heterostructures which have strong interface interactions,we find that the interface interaction between CrI_(3) and BiFeO_(3)(001) is van der Waals ***,the heterostructure has particular strong magnetoelectric coupling where the bilayer CrI_(3) can be efficiently switched between ferromagnetic and antiferromagnetic types by the polarized states P↑ and P↓ of BiFeO_(3)(001).We also discover the competing effect between electron doping and the additional electric field on the interlayer exchange coupling interaction of CrI_(3),which is responsible to the magnetic phase *** results provide a avenue for the tuning of 2D magnets with a small electric field.

关键词： magnets perovskite ferromagnetic

An effective thermal conductivity model for unsaturated compacted bentonites with consideration of bimodal shape of pore size distribution

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

Science China(Technological Sciences) 2015年第2期58卷 369-380页

作者： CHEN Yi Feng WANG Min zhou song HU Ran zhou Chuang Bing State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering (Ministry of Education) Wuhan University School of Civil Engineering and Architecture Nanchang University

An effective thermal conductivity model was proposed for unsaturated compacted bentonites with consideration of the bimodal shape of pore size distribution curves. The pores of soils were grouped into two dominant pore size modes corresponding to the intra- and inter-particle pores, and were simulated with randomly distributed spheroidal inclusions of different aspect ratios. With the assumption of preferential invasion of the wetting fluid （water） into pores of smaller sizes and by virtue of the analyt- ical solution to the inhomogeneous inclusion problem in heat conduction, the model was developed using the Mori-Tanaka （MT）, Ponte Castafieda-Willis （PCW） and self-consistent （SC） homogenization approaches for different considerations of the interactions between pores and the solid phase. The proposed model is functions of the thermal conductivities of the solid, liq- uid and gas phases, porosity, the degree of saturation, the aspect ratios of pores and/or soil particles, and the fraction of the smaller group of pores. The proposed model was validated against five sets of laboratory measurement data on the MX-80, FEBEX, KunigeI-V1 and GMZ01 bentonites, showing a good agreement between the model predictions and the laboratory measurements. The responses of the model with respect to the geometries of pores and solid particles were examined. Com- pared to series-parallel structural models, the proposed model may overall exhibit better performance if proper homogenization schemes are adopted, but as an advantage, the model has clearer physical mechanisms and a smaller number of parameters.

关键词： thermal conductivity homogenization schemes compacted bentonite unsaturated soil pore size distribution three-phase media

Asymptotic Behavior of Soliton Solutions with a Double Spectral Parameter for Principal Chiral Field

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2005年第6X期44卷 977-980页

作者： song Quan-Fu zhou Zi-Xiang School of Mathematical Sciences Fudan University Shanghai 200433 China

The soliton solutions with a double spectral parameter for the principal chiral field are derived by Darboux transformation. The asymptotic behavior of the solutions as time tends to infinity is obtained and the speed... 详细信息

关键词： principal chiral field asymptotic solutions

Trigonometric Series with a Generalized Monotonicity Condition

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2014年第8期30卷 1289-1296页

作者： Lei FENG Vilmos TOTIK song Ping zhou Institute of Mathematics Zhejiang Sci-Tech University MTA-SZTE Analysis and Stochastics Research Group Bolyai InstituteUniversity of Szeged Department of Mathematics and Statistics University of South Florida

In this paper,we consider numerical and trigonometric series with a very general monotonicity ***,a fundamental decomposition is established from which the sufficient parts of many classical results in Fourier analysis can be derived in this general *** the second part of the paper a necessary and sufficient condition for the uniform convergence of sine series is proved generalizing a classical theorem of Chaundy and Jolliffe.

关键词： Uniform convergence monotonicity mean value bounded variation decomposition