Materials Literature
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A series of experiments of electron beam welding(EBW) using 1Cr18Ni9Ti as test material were carried out and the weld joints of good quality were obtained.The results show that penetration depth increases linearly with the increasing beam current.Under the conditions of the low accelerating voltage and the slow weldin…
The formation characteristics of micro-droplets and the effects on atmospheric corrosion process were investigated in situ with stereomicroscopy and the electrochemical polarization.The experimental results showed that the metal property,the primary-droplet character,the relative humidity and the liquid/metal interfac…
The paper introduces a new approach based on image processing techniques to determine blending ratio of the wool/cashmere blended yarn.Inphase of preprocessing,the cross-section images of wool/cashmere blending yarn are denoised and smoothed by means of mathematical morphology operations.Based on mechanism of human si…
Mg-modified alumina(Mg-Al2O3)was prepared by using the impregnation of Ma(NO3)2 solution onto Al2O3.Mg-Al2O3 was used as a catalytic support to make MnOx/Mg-Al2O3 catalysts,and the catalysts activity of MnOx/Ma-Al2O3 catalysts for methane combustion was tested.The results show that the addition of Mg into Al2O3 suppre…
Based on the application requirements of magnetostrictive materials in weak magnetic field sensor,the magnetic field response sensitivities of Tb-Dy-Fe material and Fe-Ga alloy were measured by using Michelson interferometory.The magnetic field and temperature responses of Fe-Ga alloy under different external stresses…
In order to classify the ultra-high-frequency(UHF) partial discharge(PD) signals resulting from four types of insulation defects in gas insulated switchgear(GIS),the complex wavelet transform is applied to extract features of UHF PD signals.Five statistical parameters including mean,variance,kurtosis,skewness and ener…
The recent development of corona-resistant polyimide films was overviewed in this paper.It reveals that a key breakthrough hasn't been made in our country's study on the film,thoughthere are already some research progresses on the film structure,properties and anti-corona mechanisms.Many key performance indicators of…
Two novel 9,9′-dibutylfluorene-styrene alternating copolymers,p-PF-PPV and o-PF-PPV were synthesized by Wittig reaction.The structures of the monomers and the copolymers were verified by means of 1H nmR,MS,and FTIR.The molecular weight of the polymer was determined by gel permeation chromatography(GPC) analysis agains…
Aim:To prepare chitosan-coated L-dopa liposomes,and to optimize the formulation and freeze-drying processing parameters of L-dopa liposomes.Methods:The liposomes were prepared by using reverse phase evaporation followed by freeze-drying,and effects of the factors on the entrapment efficiency of L-dopa liposome were st…
In order to obtain a polyester fabric characteristic of electromagnetic wave proof,copper was plated on polyester fabric by using sodium hypophosphate as reluctant.Pretreatment process was investigated including roughenation,activation,deterioration,reduction and drying with focus on the analysis of roughenation and a…
The paper studies the new process,new technology,new equipment and new materials of special coatings applied on liquid-loaded cargo tank of oil product carrier,develops special process and special equipment suitable for coating various cargo tank of oil product carrier,and improves the coating quality and efficiency t…
Based on the experimental yarn performance and selected dyeing and sizing technology line with blue and black dyeing style,the technical parameters of weaving machine and processing technology of the appropriate short-quarter cotton denim are determined through the theoretical analysis of the weaving characteristics i…
When producing ductile iron, the graphite morphology in cast iron often changes. Especially in making large cross-section ductile iron parts, the graphite of the casting center is often abnormal. Graphite metamorphosis can not be described by degradated spheroidization. It is not only vague in concept, but also mislea…
Through the research and understanding of the ingredient,the performance,forging and the heat treatment craft of the 7Cr7Mo2V2Si(is generally called the LD steel),and carries on the performance to compare the LD steel with the Cr12MnV steel and 6CrNiSiMnMoV(is generally called the GD steel),finally selects the LD stee…
The quality defect of the molybdenum poles and its undesirable impact to the following wire-drawing procedure were analyzed.The rolling pass of Y250 rolling mill was improved and the production technique of the round molybdenum poles was determined.The quality problems of φ7.4 mm round molybdenum poles in practical pr…
On the basis of the calculation results of phase diagram thermodynamics,the phase diagram of ZA52-xY system alloys was calculated using Calphad software PANDAT.Three kinds of ZA52-xY alloys with different Y additions(0%,0.5% and 1.0%) were prepared and the microstructures and mechanical properties were investigated by…
A successful start of Yong-Ping refinery FCC MIP Ⅱ sets were installed in April 8,2004,which was the first in the domestic application of new catalytic cracking unit of the process and put into production,it is smooth run of 5 years.Through the last few years of production practices and technology,and explore the MIP…
We have grown PbMg1/3Nb2/3O3-PbTiO3(PMN-PT) thin films by radio frequency(RF) sputtering deposition at 550 ℃-650 ℃ on Pt/Ti/SiO2/Si and TiO2/Pt/Ti/SiO2/Si substrates.The phase compositions and microstructure of thin films were characterized by X-ray diffraction(XRD) and scanning electric microstructure(SEM).The effect…
A calculating model considering nonlinearity of both the transformer inductance and the losses is presented,where the simulated transformer is by nonlinear inductance and resistance in parallel.The calculating method for the characteristic curves of the nonlinear inductance and resistance with the data of voltage,curr…
A new 2D layer supramolecular compound,H_(10)[Ni_4~(Ⅱ)(H_2O)_(10)(B—β—SbW_9O_(33))_2]·2H_2O,has been synthesized under open—air reaction conditions,and characterized by ICP,IR,TG and single crystal X—ray diffraction analysis.Result reveals that the compound belongs to monoclinic system with P 21/n space group.The cell…