Materials Literature
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The kinetics of calcium oxalate(CaOxa) crystallization and the effect of three carboxylates were studied by determining the changes of free Ca2+ ions concentration and the size of CaOxa crystallites with the reaction time.These carboxylates were monocarboxylic acid salt(NaGlu),dicarboxylic acid salt(Na2Tart),and trica…
SiO_2-PDMAEMA polymer brushes was prepared by Atom Transfer Radical Polymerization(ATRP).and phosphomo lybdic acid was immobilized in polymer brushes with dimethylamino groups on side chains to synthesize catalyst SiO_2-PDMAEMA -PM0O40.via acid-base neutralization reaction and electrostatic interactions.Structure and…
Equivalent salt deposit density(ESDD) and non soluble deposit density(NSDD) are the basic data for outer-insulation coordination and pollution distribution classification.XP-70 is usually selected as an observation insulator for pollution distribution classification in China.We selected 54 transmission towers represen…
Based on the minimum wear rate theory,the coated carbide tools were used for dry turning the iron-based superalloy GH2132.The cutting parameters were optimized by the single factor test.On the minimum surface wear rate,the relation among the cutting force,cutting tempreture,surface roughness and cutting parameters was…
The influence of different types of structure-directing agents(SDA),crystallization temperature and content of alumina source on the crystallization of ultra-fine ZSM-5 zeolite was studied.Scanning electron microscope(SEM),transmitting electronic microscopy(TEM) and X-rays diffraction(XRD) techniques were used to char…
According to the characters of PC hot strip mill,the PC mill shape and crown predictive model was established to simulate the rolling process of PC mill through using differential method to solve the metal plastic deformation and using influence function method to solve elastic deformation of rolls.The roll-bending fo…
Objective:To obtain trimetazidine solid dispersion(SD) with sustained release property.Methods:Trimetazidine sustained release SD was prepared by solvent method.Using in vitro release rate as an index,single factor test was employed to investigate the effects of carriers,preparation methods,ratio of drug/carrier,poros…
Polymer agglomerating was a special technology.The agglomerating process can prepare stable latex in a short time especially when preparating the polybutadiene latex with big particle diameter,and can improve the product quality and production efficiency.The agglomerating process that the 450 nm polybutadiene latex wa…
In this paper,the graphene nanosheets(GNs) of multi-layer structure is prepared by oxidation reduction,the time of bath reaction in the moment of reduction effect on crystal structure of GNs is analysed,and photovoltaic performances and impedance characteristic of GNs as a counter electrode catalytic layer of dye-sens…
Simulation experiments of constant-strain-rate hot-compression for Mg-5.5Gd-4.5Y-1Nd-xCe-1Zr(x=0 and 0.2%,mass fraction) alloys were carried out with the conditions of temperatures of 375-525 ℃,strain rates of 0.01,0.1,1 s-1 and a maximum deformation reduction of 50% by Gleeble-1500D thermal simulators.Then,its plasti…
Zinc plating is a main method for improving the corrosion resistance of steel plates.But in various environments,zinc is easy to be corroded.In order to increase the surface quality of galvanized steel,to slow down the corrosion rate of zinc coating and to,extend the service life,the passivation treatment is needed.In…
81.5% granulated high furnace slag,5% steel slag and 12.5% flue gas desulphurization(FGD) gypsum was mixed with 1% cement clinker.The compressive strength of the mixed cementitious material was 56.75 MPa after cured for 28 d.The prepared cementitious material had low calcium content compared with normal P.O.cement and…
Nano-ZrOx catalyst has been fabricated by a surfactant assisted hydrothermal method.XPS,XRD and UV-vis techniques are adopted for the characterization of the as-prepared nano-ZrOx.Monoclinic and tetragonal phases both exist in the crystal of the catalyst,and the crystallite size is ca.8 nm.Based on the fitting results…
Due to the incorporation of Cu/Low-k for copper interconnects fabrication,the Cu chemical mechanical planarization(CMP) is necessary to be performed at a reduced down pressure.In this paper,we have developed an inhibitor free alkaline copper slurry,the dissolution rate results indicate that the slurry has a low etch r…
The under-filling defect of I-beam in a heavy truck front axle which occurs in the process debugging of the precision roll-forging and die-forging is studied.Finite element models of precision roll-forging and die-forging are established based on FEM software and the previous productive results.Then,the mechanism of t…
The conventional vacuum thermal evaporation is modified to fabricate CdS/ZnS core/shell heterostructural nanowires.Firstly,CdS nanowires are synthesized by catalyst-assisted vacuum thermal evaporation.Then,ZnS shells ard deposited on the CdS nanowires by the secondary evaporation.Investigations by XRD,EDX and TEM demo…
The recrystallization behavior of alloy 690 was investigated through thermal physics simulation,and the recrystallization diagram of alloy 690 was established using quantitative metallographic method.The results show that obvionsly dynamic recrystallization of alloy 690 is occurred during hot deformation,and deformati…
Stacrh/NaAA/CR water-absorbent composites were prepared by blending polychloroprene with starch,NaAA and vulcanizing agents.The effects of the different swelling mediums on mechanical properties and water absorbent properties of stacrh/NaAA/CR water-absorbent composites were investigated in deionized water and NaCl so…
Ni/CCA catalysts with different Ni loading were prepared by impregnation method used carbon-covered alumina(CCA) as support.The samples were characterized by N2 physisorption,X-ray diffraction,Ultraviolet-vi-sible diffuse reflectance spectroscopy,H2 temperature-programmed reduction,H2 temperature-programmed desorption…
PVA/FeCl3/Co(CH3COO)2 composite nanofibers were synthesized by using sol-gel processing combination with electrospinning technology,where polyacrylonitrile and manganese acetate were used as precursors.After high temperature calcination,CoFe2O4 nanofibers were successful prepared.The samples were characterized by scan…