Materials Literature
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This study investigates the hydrogen-air PEMFC stack recession, whose stack has been used for three years. By installing a 5kW fuel cell stack in a golf cart, the test is done, including road test and bench test. The results indicate that the hydrogen-air fuel cell stack dynamic performance declines a lot, whose power…
To prepare high activity chito-oligosaccharide and to study its biological activity,the number average molecular mass of chito-oligosaccharide which prepared by degradation with specific chitosanase was determined with acetylacetone method.Mice were administered with chito-oligosaccharide with different doses,to discu…
According to the status of clothing market segmentation based on age differences,the age factor was introduced to study the size standard subdivision for wonen's garment and 379 groups of body-type data samples for adult women 26 to 55 years old were collected by using non-contact 3D body measurement instrument.Throug…
Al2(1-x)MgxTi1+xO5-δ(x=0-0.25) ceramic were prepared by hot-press sintering method at 1350-1550 ℃ in Argon atmosphere with α-Al2O3,anatase TiO2 and MgO followed the constitution of Al2(1-x)MgxTi1+xO5.Effect of sintering temperature and MgO additive on the densification of the material and oxygen vacancy which was a ki…
Four decorative panels made from regular blockboard,flame retardant blockboard,rubber insulation board,and fire retardant plywood were evaluated for their combustion properties:heat release rate(HRR),fire growth rate indices(FIGRA),total heat release(THR),total smoke production(TSP),and smoke growth rate(SMOGRA)using…
Biofouling has great impact on marine vessels and engineering facilities,resulting in huge losses to the development of marine economy.It is very important to study the regular pattern of biofouling and develop new antifouling materials for controlling biofouling.Here we studied the initial attachment behavior of bact…
A nickel-chromizing layer was formed on the surface of Q195 steel by pulse single power plasma.The surface morphology,phase composition and Cr-Ni content of nickel-chromizing layer were analyzed by XRD,SEM and EDS.The polarization curves of nickel-chromizing layer in 3.5% NaCl solution and 1 mol/L HNO3 solution were m…
Tri(n-amy1) citrate was synthesized from citric acid and n-amy1 alcohol using selfC ^made rare-earth solid excess strong acid SO42-/TiO2/La3+,SO42-/SnO2/La3+,SO42-/ZrO2/La3+,SO42-/Fe2O3/La3+.Effects of different factors on the reaction were investigated by single-factor and orthogonal experiment.Experiment shows:when…
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…