Materials Literature
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The effect of different concentration of NaHCO3 on growth and photosynthesis of Nostoc flagelliforme cells in liquid suspension culture were studied.When the concentration of NaHCO3 was 15mmol/L,the cell biomass and the exopolysaccharides were 1.03g/L and 43.23mg/L after 15d of cultivation in the BG-11 medium,which in…
Experimental investigation of surface roughness was performed in high speed turning of hardened AISI P20 steel with PCBN tool.Optimal cutting parameters were found to improve the machining performance based on design of experiment.Simulations were done to describe the relationship between surface roughness and cutting…
The effects of hot charging process on mechanical properties and microstructure were studied.The results indicate that in the same conditions of hot rolling and cooling,the yield strength of hot rolled plates by hot charging process is lower than that of cold charging process,but the toughness of hot rolled plates by…
An emission reduction technique of SO2 in sintering process based on adding urea was proposed.Sintering pot experiments were performed on sintering mixtures with different urea-water ratios.Experimental results showed that NH3 produced by thermal decomposition of urea could react with SO2 and form(NH4)2SO4,which was b…
Decarburization is one of the important factors to impact the service life of 60Si2Mn damping spring in the petroleum drilling rig hook.The relation of the surface decarburization with the change of heating time was studied,using the DEFORM-3D software to simulate the decarburization process of 60Si2Mn damping spring.…
P(St-EA-MAA) microspheres with different size were synthesized by seed emulsion polymerization of styrene(St),ethyl acrylate ester(EA) with methacrylic acid(MAA).The P(St-EA-MAA)/SiO2 composite microspheres were prepared by using γ-aminopropyl trimethoxysilane(APS) and tetraethyl orthosilicate(TEOS) as co-structure-di…
A novel fluorinated acrylamide monomer bis(heptafluorobutyl(methacrylamido-4-phenoxyl)) phosphonate(FPA) was synthesized from bis(heptafluorobutyl) phosphorochloridate and N-(p-hydroxyphenyl)methacrylamide.The monomer FPA was copolymerized with acryloyloxy-1,3-bis(diethylphosphoramidate) propan(BisDEAEPN),2-hydroxyeth…
Effects of chloride ion concentration and temperature on the anode performance of aluminum/air batteries were studied by polarization curves,electrochemical impedance spectroscopy (EIS) and galvanostatic potential-time curves.The results showed that the aluminum alloy exhibited the fastest corrosion rate when the chlo…
Graphene has attracted much attention in fields such as physics,chemistry,and materials science,because of its unique properties and potential applications.This was a review of synthesis of graphene using different preparation methods,such as epitaxial growth,chemical vapor deposition,micromechanical exfoliation and c…
N,N,N-trimethyl chitosan methylsulfate(TMCMS) was prepared by a two-step reaction.First,N,N-dimethyl chitosan(DMC) was synthesized by reaction of chitosan with formic acid and formaldehyde.Then,DMC reacted with dimethyl sulfate to yield TMCMS.It was characterized by FT-IR,1H NMR and elemental analysis.Its average quat…
Nano-copper was deposited by RF magnetron sputtering on carbon fiber(CF) fabric at room temperature and in order to improve the bonding fastness of the coated film and the substrate,the low-temperature plasma pre-treatment had been applied to the substrate.The composition and crystalline state of Cu film were analyzed…
Employing the backstepping technique,an adaptive inverse controller is designed for a class of uncertain dynamic nonlinear systems preceded by an unknown Prandtl-Ishlinskii hysteresis.Decomposing the Prandtl-Ishlinskii model into a discrete Prandtl-Ishlinskii operator and a small term of bounded error,we developed an…
GT35 steel-bonded carbide was prepared by spark plasma sintering(SPS) technique.The effects of sintering process,heat treatment on microstructures and properties were studied.The results show that compared with traditional powder metallurgy steel-bonded carbide,the GT35 steel-bonded carbide prepared by SPS technique h…
This article presented a quantitative and friendly method to measure the thickness of plastic film rapidly from the Fourier transform infrared(FT-IR) spectra of the film.Applying the law of Lambert-Beer,the working curve was set up by analyzing the characteristic peaks in the infrared spectra of the plastic films of d…
An intumescent flame retardant 3,9-dichloro-2,4,8,10-tetraoxa-3,9-diphosphaspiro- undecane-3,9-dioxide(SPDPC)-hexamethylendiamine copolymer(PSPHD) molecules containing active end-group were grafted onto the sepiolite(SEP) surface via condensation between acryl chloride of PSPHD and hydroxyl groups existed on sepiolite…
The corrosion behavior and electrochemical properties of three kinds of typical grounded metals (H62 brass, Q235 and galvanized steel), in the simulated solution of central-section Shanxi soil were investigated using weight loss method (immersion under externally applied current) and electrochemical tests in associati…
The reaction mechanism of synthesis of silicon nitride by carbothermal reduction and nitridation was analyzed in this paper.The research progress of silicon nitride powder and porous silicon nitride ceramics prepared by carbothermal reduction method were summed.The current problems of carbothermal reduction technology…
To evaluate the performances of chemical looping reforming systems for hydrogen production,two CH4-fueled hydrogen production systems using NiO/NiAl2O4 as oxygen carriers,autothermal chemical looping reforming(CLR(a)) and steam reforming(CLR(s)),were simulated and analyzed using Aspen Plus.Hydrogen production efficien…
The Ba2B2O5:Dy3+ phosphors were synthesized by high temperature solid-state reaction.The luminescent properties were investigated.The main peak of emission spectra locating at 483 nm and 575nm,which correspond to the 4F9/2→6H15/2 and 4F9/2→6H13/2 typical transition of Dy3+.The main peak of excitation spectra located a…
A novel two-stage brushless self-excited method of tangential/radial hybrid excitation synchronous generators(T/R-HESG) was proposed in this paper.Combining the configuration and the magnetic circuit characteristics of T/R-HESG,a novel two-stage brushless method was designed.Complete self-excitation was realized.The e…