Materials Literature
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The extraction technology of the C21 steroidal glycosides in Cynanchum bungei was studied.By comparing 3 different extraction technologies,ethanol as extractive menstruum,the heated circumfluence extraction technology was adopted.By mono factor design and central composite design,factors affecting C21 steroidal glycos…
The magnetic performance of AlNiCo8 hard magnet used in aero field was enhanced by-70-300℃ high-low temperature heat treatment.And the performance of AlNiCo8 between 20-180℃ was measured by high temperature magnetic testing system AMT-4.Results show that high-low temperature heat treatment can make the magnetic perfor…
In this paper,we describe multilayer ZnO thin films prepared by spin-coating precursor solutions of different concentrations.The multilayer ZnO thin films were employed as active layers in thin film transistors(TFTs).A TFT device based on a three-layer ZnO film prepared using precursor concentrations of 0.25,0.10,and…
A new asymmetrical nickel phthalocyanine(NiPc2 for short) was synthesized by increasing the temperature of the classical synthetic method,and its structure was characterized by MS,IR and UV-Vis-NIR spectroscopy.Meanwhile,a hypothetical mechanism was suggested and the electrochemical properties was studied by cyclic vo…
The effects of different pulse voltage,pulse frequency of low-voltage pulsed magnetic field and preheating temperature of mold on solidification structure and shrinkage of pure aluminum were investigated.The results show that the grains of pure aluminum can be refined evidently by low-voltage pulsed magnetic field,the…
Used silica with different ligands was recovered and regenerated by means of acid treatment.Iminodiacetic acid(IDA)recycled silica column was synthesized using IDA as new ligand and pickled silica with different ligands as matrix by direct or indirect methods.The chromatographic performance of synthesized packing mate…
Kinetics of fucoxanthin radical cation(Fuc·+) formation in chloroform and in methanol were comparatively studied by means of nanosecond time-resolved absorption spectroscopy combined with spetroelectrochemistry.Direct photoexcitation and anthracene-sensitized triplet excitation,respectively,were used to initiate the p…
In order to study the effect of silane coupling agent treatment on the tensile properties of single basalt filament,the surface of different kinds of basalt fibers is treated with silane coupling agent KH-550.Single filament tensile test is applied,combined with scanning electron microscopy and SPSS statistical analys…
A new stable cationic polyacrylamide water dispersed(CPAM) is prepared by the copolymerization of acrylamide(AM) and dimethylaminoethylacrylate(DM) with polyelectrolyte as dispersant(PDMC) and water soluble polymer as stabilizer(PAB).The apparent viscosity(η) and intrinsic viscosity([η]) of the CPAM are respectively 5…
Requirements of the raw material of low relaxation PC steel bar used for high railway ballastless track plates were introduced,and some equipments used for low relaxation PC steel bar production was also introduced.Through comparison of the yield ratio and relaxation of different PC steel bar made from different raw m…
A series of Al-Ni2P/SBA-15 catalysts with initial P/Ni molar ratio of 0.8 were prepared using(NH4)2HPO4 as a source of phosphorus,Ni(NO)3 as a source of nickel,and Al content from 1.06wt% to 6.35wt%.The catalysts were characterized by XRD,TEM and N2 adsorption-desorption.The catalytic performances of the hydrodesulfur…
The diffusion couples of Ni/Al were prepared using embedded diffusion couple technology, then, treated at different temperatures between the melting point of Al and Ni for different holding times. The microstructure evolution and forming mechanism of Ni-Al solid/liquid diffusion couple at different temperatures for di…
In order to study the diffraction characteristics of blazed gratings and analyze the influence of grating parameters on diffraction efficiency, the dependence of diffraction efficiency on the different grating structure parameters and wavelengths was obtained based on the rigorous coupled-wave electromagnetic theory.…
1,12-Tyrosine diaminododecane(DADT) was synthesized by L-tyrosine and 1,12-dodecanediamine,and the structure of DADT was characterized by 1HNMR.The self-aggregation behavior of DADT in water was determined by conductivity,isothermal titration calorimetry and fluorescence spectroscopy.The critical micelle concentration…
In this paper,the effect of Ce-doping of metal oxidation on the removal of volatile organic compounds was studied. The combustion catalysts MnOx /TiO2 and MnOx-CeO2 /TiO2 were prepared with MnOx and MnOx-CeO2 as active components by impregnation method on porous TiO2 films. The active group of distribution ratio and l…
To obtain high strength and good corrosion resistance of Mg-9Gd-4Y-1Nd-0.6Zr alloy,the effects of ageing on strength and corrosion resistance were investigated by means of optical microscopy,scanning electron microscopy,transmission electron microscopy and electrochemical methods.The results showed that the Mg alloy a…
The formation of explosively-formed projectile(EFP) with single material layer liner and composite series material layers liner are developed with both experiments and numerical simulation.The photograph of flash X-ray for typical status of EFP and effect of penetration of a steel target are achieved,which provide an…
Cordierite honeycomb was coated with three different liquid coating precursors, i. e., alumina sol, alumina slurry and mixed slurry prepared from pseudoboehmite powders. Effects of solid content in the precursor and viscosity of the liquid precursor on loading percentage, surface area and adhesive capacity of the coat…
Graphite oxides (GO) are synthesized by the chemical oxidation method using different purity graphite as raw materials and the various adding rate of strong oxidizing agents (KMnO4) at the stage of oxidation in the fabrication process. High purity and highly crystallized GO can be obtained through using high purity gr…
Shrink fit is always been used in the connection between shaft and sleeve,but it is difficult to measure the stress on the shaft surface produced by shrink fit process.In this experiment,used an indirect method to measuring this stress.