Materials Literature
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The electron localization function(ELF) is an important tool to study electronic structure.In this article,the concept of electron localization is introduced and the overlap between the physical meaning and functional form of the ELF is discussed in detail from two points of view:electron pair density and kinetic ener…
A carbonized diatomite was prepared by calcining Inner Mongolia diatomite rich in organic matter under reducing atmosphere.The carbonized diatomite was partly substituted for carbon black to reinforce natural rubber(NR).Fourier-transform infrared spectra(FTIR),X-ray diffraction(XRD),thermoanalysis(TG-DTA),scanning ele…
The graphite oxide(GO) samples with different degrees of oxidation were prepared from purified natural flake graphite via modified Hummers method controlling the amount of oxidant.The structural and spectral analysis for samples were carried out by using XRD,FTIR,Raman and fitting part of spectral data.The results sug…
Rod-plane air gap is the most typical gap in the research of air gap discharge,and its switching impulse characteristic is a very important factor for dimension of air gaps in the project design of transmission lines and converter stations/substations in transmission project.To study switching impulse characteristic o…
Porous anorthite/mullite composite ceramics with different mullite contents were fabricated by foam-gelcasting method,using CaCO3,SiO2,α-Al2O3 as raw materials.Effects of mullite content on bulk density,po-rosity,compressive strength,thermal conductivity and microstructure of the porous composite ceramics were re-sear…
Aiming at estimating the life of solid insulation in the transformer,we experimentally investigated the accelerated ageing process.The results reveal that the aging process of the insulation paper can be divided into quick one and slow one.The relation between initial aging rate(k) and temperature is obtained by Arrhe…
We introduced numerical algorithms for electron transport parameters of air calculated by rigorous Boltzmann equation in order to solve a variety of air discharge in the electron transport parameters,and calculated the electron energy distribution function by using cross-section-data available in the literatures and s…
Bacterial cellulose/polyacrylamide composite hydrogel(BC/PAM) was prepared through free radical polymerization in which polyacrylamide(PAM) was introduced into the network of bacterial cellulose(BC).Structure and properties of composite hydrogels were studied through scanning electron microscopy(SEM),infrared spectrum…
Considering the anisotropic and nonlinear conductivity of oil-immersed paper in converter transformer's insulation,the FEM(finite element method) state equation was obtained by the penalty function method,and the equation was solved by Runge-Kutta method.The transient electric field was calculated of a practical conve…
The analyzed and calculated results indicate that the concrete failure strength will decrease under higher hydrostatic pressure,when the original failure parameters of HJC and RHT models implemented in LS-DYNA and AUTODYN are adopted.A new method is introduced which using the characteristic strength of concrete to con…
For cotton harvesting robot,the cotton image segmentation is one of the key technologies.In this paper,under HSV,HIS,and YCbCr color spaces respectively,according to the difference between cotton color and background color,the various objects(cotton batting,cotton branches,soil etc.) in the sample images were classifi…
Kinetics of titanium hydride decomposition were investigated by DSC/TG tests during elevating temperature and kinetic parameters were calculated by Coast-Redfern integral method.The results show that the initial temperature of titanium hydride decomposition is 510 ℃,whose mass loss ratio reaches 3.15% totally during d…
Based on the meso-structure of three-dimensional(3D) braided composites,the finite element models of thermo-physical properties of four-directional and five-directional composites are established.By using the periodic non-adiabatic temperature boundary condition and displacement boundary condition,the global effective…
Split experiments and spall experiments for the reactive powder concrete(RPC) are conducted using the split Hopkinson press bar(SHPB) apparatus.The results show that the spall strength of RPC is about half of the split tensile strength and that the addition of steel fiber into the RPC leads to an increase of the impac…
The nano-silica surface was modified using silane coupling reagent KH-560.In order to investigate the best modification conditions,the effects of the content of nano-silica and KH-560,reaction time and temperature were studied.The modified SiO2 was characterized by FT IR and TG techniques.The best modification conditi…
The tensile,compressive and shear property of 4D in-plain C/C composites in each direction were studied by macroscopic mechanical experiment.ARAMIS incontact strain test system was successfully used to solve the incompatible problems produced in using strain gauge to test the properties.The results show that the prope…
In recent decades,gel polymer electrolytes(GPEs) have received renewed attention in several areas such as lithium-ion batteries,solar cells and super capacitors due to their promising application.GPEs,swollen in a liquid electrolyte becoming plasticized or a gelled polymer electrolyte,have attracted particular attenti…
To find the reason why flashover occurs in the 800 kV wall bushing of high-potential valve hall during the voltage withstand test on-site of UHVDC project and to study the improvement measures.Combining the field test in practical situation,we analyzed the basic reason with finite element method.Results show that the…
In order to apply the composite pole to power transmission lines for solving the problems of lightening or polution flashover,it is necessary to test its material,electrical and mechanical characteristics.The test results in this paper are as following: the polyurethane composite can remain its insulativity somehow un…
The catalytic oxidation of fuel-lean CH4-H2 mixtures over Pt was investigated numerically in a micro-channel,focusing on the impact of the adition of H2 on CH4 reaction in principle.The results show that the surface sites Pt(s)are covered by O2,inhibiting the adsorption of CH4 and resulting in a high ignition temperat…