Materials Literature
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The synthesis and characterization of poly-β-hydroxyalkanoates(PHA)by activated sludge from acidified starchy wastewater were studied.The results showed that the acidification products of starchy were butyric,acetic,propionic,valeric acids and ethanol.These organic acids were used to feed activated sludge to produce P…
Using barley foam-active protein as raw material,the modified protein was prepared in heating. The optimal processing was investigated through orthogonal test,which led to the conclusion that the optimum graft reaction conditions were as follows:the weight ratio of glucose to protein 1∶2,pH 9.5,60 min would yield graf…
By the static whole-soaking test in simulated seawater,the effect of nickel and silicon on corrosion resistance of low temperature high toughness ductile iron was studied.The results show that with constant silicon content,the corrosion rate of the iron decreases with the increase of nickel content;and with constant n…
The ground-state geometries of carbazole and its derivatives were optimized using DFT/B3LYP method at the 6-31G basis set,as implemented in Gaussian 03.And the bond length,bond angle,HOMO,LUMO orbitals and energy levels were obtained.The absorption spectra and the excitation energies were abtained using the time densi…
The presence of the photonic band gap does not lead only to appearances of lots of new materials and devices but also creates a specific physical environment,that is,a periodically dielectric field on the wave length scale.This periodically dielectric field on the wave length scale creates a new possibility for the mo…
To prepare the polylactide(PLA) porous scaffolds whose structure and property could meet the needs of bone tissue engineering,a series of PLA porous scaffolds were prepared by frozon extraction phase separation method with using 1,4-dioxane and water as the blend solvent and poly(ethylene glycol)(PEG) as the porogen.T…
Highly stable microbubble dispersions with mean bubble diameter of less than 100 μm were prepared simply by nonionic surfactant of glyceryl monostearate(GMS).The microstructure,phase transition and rheological properties on these colloidal systems were studied using optical microscopy,freeze fracture transmission elec…
Ba0.5Sr0.5TiO3/Bi1.5Zn1.0Nb1.5O7(BST/BZN) multilayer composite films were prepared on Pt/Ti/SiO2/Si substrates by the sol-gel method.The structures,microscopic morphologies and dielectric properties of BST/BZN multilayer composite films annealed at different temperatures were studied.The results show that perovskite B…
The author calculates the atomistic force constants after optimizing the structures of carbon nanotubes with the approach of first-principle density functional theory.The phonon dispersion relations of carbon nanotubes are also calculated from the calculated force constants.Using quantum non-equilibrium Green function…
Some important factors to influence the tensile strength and ultimate elongation of polyurethane elastomer based on hydroxyl-terminated polybutadiene (HTPB), including curing parameter (r value), diisocyanates type, chain extender type and so on. Several methods and their progress of improving the mechanical propertie…
We found that basic alumina showed better catalytic performance in the epoxidation of styrene with hydrogen peroxide under mild conditions without supporting any active components, in which the conversion of styrene can be up to 90%,the selectivity of styrene oxide reached to 71%,and the by-products was only a little…
Magnesium hydroxide/melamine phosphate borate(nano MH/MPB),a novel nano-composition intumescent flame retardant,was synthesized with the in-situ reaction method from MgCl2·6H2O sodium hydroxide(NaOH) and melamine phosphate borate(MPB) in the absence of H2O.The structure of the product was confirmed by EDAX IR and XRD.…
N-doped nano-TiO2(anatase) powders were prepared by calcining titania gel precursor at different temperatures.The gel precursor was obtained by improved sol-gel method using tetrabutyl titanate and urea as source.The samples were characterized and analyzed by XRD,XPS and UV-Vis diffuse reflectance spectroscopy(DRS).Th…
By on-line observing growing process of the electric branches in XLPE cable sections,the growing and the breakdown characteristic which the electric branches under different voltage classes have been found are different.After secondary pressurization,the growing speed of the forest electric branches accelerate,the sha…
The structure,hardness and high temperature oxidation resistance of RE-N-C-S-V-Nb multi-elements permeating layer in the H13 hot working die steel were researched.The results show that the permeating layer with 17μm thickness is composed of V,Nb and C,N compounds after RE-N-C-S-V-Nb multi-elements permeating,and the p…
The structure and functions of the fluid distribute which was used in A/C axis universal milling head were introduced.The main influence factors which caused the power loss and abrasion were analyzed.In order to solving that problem,the DLC film was presented for improving the rigidity and roughness of the part surfac…
The effects of T6 treatment on precipitation of β-Mg17Al12 phase and fracture properties of AZ91 alloy as-cast were studied by optical microscope,field emission scanning electron microscope,X-ray diffraction and tensile testing.The results show that the coarse and net β-Mg17Al12 phase distributed along the grain bound…
The strengthening of cold extruding may improve the fatigue strength in mechanical structures.In order to understand deeply residual stress status around hole after cold extruding,a Finite Element Method was used to establish an axisymmetric model for hole extruding shaft.By adopting simulating experimentation,relatio…
The carbonyl iron/polystyrene composites were prepared by the hot pressing method.The structural characteristics,morphology and electromagnetic properties of the composites were analyzed by X-ray diffraction(XRD),scanning electron microscopy(SEM) and HP8510 network analyzer.The results indicated that the complex permi…
Previous studies of the surface sediment composition of marine diatoms are reviewed.The review includes stratigraphic subdivision and comparisons,the reconstruction of ancient geography,sea level and coastline changes,and the latest advances in foreign research,such as taxonomy and stratigraphy of diatom resting spore…