Materials Literature
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The reliable magnetization model of current transformer core is of importance for the study on residual flux and saturation of the core.In this work,a new magnetization model of current transformer core based on stack operating is presented.The magnetization characteristics of the core are summarized,the classificatio…
A simple and reliable fabrication method about prussian blue(PB)/multi-walled carbon nanotubes(MWCNTs) nanocomposites was proposed for determination of dopamine(DA).MWCNTs was used as an enhanced compatible platform attributed to its unique structural,physical and chemical properties for PB electrodeposition.PB/MWCNTs…
Energy storage mechanisms of LiFePO4/activated carbon(AC) composite and effects of LiFePO4,AC content on the electrochemical performance of the cathode were investigated by experiments of A.C.impedance,cyclic voltammetry and galvanostatic charge/discharge.The addition of AC could increase the electronic conductivity a…
Three kinds of O-quaternary ammonium-N,N-dialkyl chitosan(QADCS)with different alkylation lengths were prepared by a self-developed quaternary ammonium reagent,glycidyl ethyl trimethyl ammonium chloride ether.The products were characterized by FTIR,EA and 1H NMR.The monolayers of the synthetic products were studied.It…
Due to great disparity in hardness of core and case of the case harden gear,the excessive cycling contact stress on gear case trends toward pitting and spalling of the gear case,which is related to the thickness of hardening layer and the distribution of the deep contact stress.But the calculation of deep contact fati…
Using first-principle within density functional theory(DFT),the structure,half-metallic stability and magnetic moment of quaternary Heusler alloys Co2Ge1-xGax were investigated.The results present that with the change of doped Ga contents x,their lattice constants follow Vigard law.In the case of Co2MnGe1-xGax series,…
The centrifugal casting technology was used to fabricate Mg2Si/Al graded composites with large quantities of primary Mg2Si particles in outer layer and expecially in inner layer.The influences of the rotation speed and the mold preheating temperature on microstructure and properties of inner layer were discussed.It is…
Single phase Bi2Te3 nanoflakes with hexagonal morphology were synthesized with solvothermal method by using glycol as solvent with appropriate content of polyvinylpyrrolidone(PVPK-30) added in.Reaction was performed in alkalinous environment at 200℃ for 260 minutes.X-ray powder diffraction(XRD),scanning electron micro…
The heat treatment technology test of M2Si superhard high speed steel was done.The effects of quenching temperature on grain size,matrix hardness and red hardness were analyzed by hardness test and microstructure observation.The results show that the red hardness can be effectively improved by increasing quenching tem…
The optical properties of the amorphous silicon nitride (α-SiNx) films were discussed using the spectra photeluminescencec (PL).The α-SiNx films with various compositions were synthesized by changing gas flow ratio of nitrogen/silane and reaction pressure via plasma-enhanced chemical vapor deposition(PECVD) on Si(100)…
Food packaging is one of the most important parts in packaging industry,which leads to increasingly serious environment pollution.This paper reviewed the global development status and trend of edible and biodegradable food packaging materials.It analyzed the social problems resulted from petrochemical-based plastic pa…
A chemically enhanced mechanism of surface-enhanced Raman scattering (SERS) spectroscopy was investigated using density functional theory (DFT). We studied the Raman spectra of the Ag13/MPH and Ag13/MPH/TiO2 systems under 514.5 nm excitation. We found that the intensities of the non-totally symmetric vibration modes w…
A high-carbon steel joint,SK5(0.84 wt% C),was successfully welded by friction stir welding(FSW),both without and with a gas torch,in order to control the cooling rate during welding.After welding,the weld zone comprised gray and black regions,corresponding to microstructural variation:a martensite structure and a dupl…
As the Last deformation process in the production of heavy rail,straightening makes a important sense to improving quality and yield of the heavy rail.In accordance with the needs of the heavy rail production,a Parameter Control Model for the vertical-horizontal combined straightener was built,Model consists of struct…
Galvannealed (GA) sheet and galvanized (GI) steel sheet used in automobile industry were pretreated,followed by painting through hanging and pasting on vehicle.The painting properties of the two kinds of sheets were studied.It was found that GI steel sheet and GA sheet showed similar painting properties and anti-corro…
Chiral conducting polymers have many unique chemical properties in the field of chiral polymers,and have become a hot research in the field of functional materials.The synthesis way of the polyaniline,polypyrrole,polythiophene and some classical chiral conductive polymers are reviewed: when the conjugated conductive p…
The recent research advances in the use of CO2 as an oxidant for the oxidation of ethane were reviewed based on the corresponding thermodynamic analysis with the emphasis on the catalyst systems,the unconventional ways of energy supply and the functions of CO2 in the reaction.Some suggestions were proposed for the fur…
The statistical properties of systems composed of polymer brushes and magnetic nanoparticles placed in a magnetic field are studied by means of Monte Carlo simulation.The direction of the magnetic field is perpendicular to the substrate plane.Polymer brushes and magnetic nanoparticles are attractive to each other.The…
This article analyses the effects of polymer spinnability on loopy yarn,polymer impurities on filtration and the change of visocosity on rheology,and puts forward process control requirements to improve polymer spinnability and technical requirements to enhance spinning operations.The several important process paramet…
The effects of addition Pd on the martensitic transformation and mechanical properties of Ni56.5Fe17Ga26.5 alloys were investigated by SEM,XRD,TEM,DSC,TG and universal testing machine.The results show that the addition of Pd promotes grain refinement,more γ phase and the toughness of the alloy.The martensitic transfor…