Materials Literature
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First-principles method based on density functional theory is used to largely optimize simulations of BaBO3 series hypoxic materials involved in four kinds of geometric structure systematically(that is cubic phase,hexagonal phase,BaBO2,BaBO4,etc.) and we get 48 relevant virtual phase structures and the binding energy…
Charecteristic of the strength of high volume fly ash concrete,describes long term increase of flexural strength of high volume fly ash concrete is expected.Short term strength is low due to late reaction of fly ash.The high volume fly ash concrete develops considerably the flexural strength higher than normal pavemen…
Direct low-temperature smelt process of the solid lead chloride was studied and a technology for treating the solid lead chloride was developed.The effects of smelting time,smelting temperature,the dosage of flux and reducer on the smelt process were investigated.The experimental results indicated that the optimum pro…
The research and development profiles and prospects of lead-free sealing glass ceramics with a high thermal expansion coefficient(α),low softening temperature(Tf) and high electrical resistivity(ρ) have been reviewed.The possibility of replacing PbO with some oxides(In2O3,SnO,Tl2O3 or Bi2O3),the metal elements of whic…
Green polymers from renewable monomers are attractive environmentally benign polymers in view of social feasibility. Recently the diversity of the green polymers from renewable monomers has extended vastly from soft elastomers to hard engineering plastics. Renewable monomers can be obtained mainly from plants and some…
A two-dimensional axisymmetric geometry which was established in this paper was divided into macro-grid finite element in order to compute temperature field;then grid was divided into more detailed and uniform cells,and at the last the continuous nucleation model based on the Gaussian distribution and KGT growth model…
Based on the traditional gear surface strengthening technology,the new gear surface strengthening technology and the gear surface compound strengthening technology were mainly focused.The fundamental principle and technical characteristics of the currently widely used new gear surface strengthening technology was intr…
Nano-CaCO3 filled styrene-butadiene rubber(SBR) powder P(SBR/CaCO3) was prepared with condensation coprecipitation method.The effect of nano-CaCO3 filling amount on the mechanical properties of P(SBR/CaCO3) vulcanizate was studied.Then the material was compared with the bulk vulcanizate of mixed SBR/nano-CaCO3.It is f…
Electroless silver deposition process was adopted to coat metal on the surface of the nylon fiber.The effects of deposition conditions on the structure and properties of the silver coated nylon fiber was studied.The morphology,elements and crystal structure of the deposited layer were characterized by FESEM,EDS,XRD,an…
Based on Ansys Workbench,static characteristic analysis of high-speed vertical machining center headstock was carried on,known that the stiffness of side face of the head of headstock closing to the main body was small,and the stress distribution of headstock was uneven.The static stiffness of the improved headstock i…
AZ31B Mg alloy was pretreated with a phosphating fluid,followed by electroless Ni plating.Resultant phosphating coating and eleotroless Ni coating were evaluated by means of visual method,observation with a scanning electron microscope and measurement of cathodic polarization curves.Results show that desired electrole…
Magnesium hydroxide sulfate hydrate(MHSH) whiskers were prepared with magnesium chloride,ammonia and magne-sium sulfate as starting raw materials by an one-step hydrothermal method.The stoichiometric composition of the whiskers is MgSO4·5Mg(OH)2·2H2O.The effect of reaction condition on the composition and morphology o…
In recent years,the biological activities of fullerene nanoparticles have received extensive attention,but there are few reports on aqueous nanoparticle suspensions of fullerene derivatives and bacterial growth.The antibacterial effects of two aqueous nanoparticle suspensions of fullerene derivatives,bis-methanophosph…
Response surface methodology(RSM) was used to optimize the extraction process of water-soluble dietary fiber from bracken.As indicated by the results,the extraction rate of water-soluble dietary fiber was greatly influenced by the concentration of citric acid and solid-liquid ratio,the best conditions of extraction: t…
Mesocarbon microbeads(MCMB) were prepared from coal tar pitch and carbon nanotubes(CNTs).The morphologie and structure of the MCMB were investigated by SEM,laser particle size analyzer and XRD.The effect of CNTs addition on the morphologie,particle size,yield,crystallite structure of MCMB and technological parameter w…
To elaborate the difference of strains for ramie degumming,and select high-efficiency strain,a comparative study on the degumming properties of high-efficiency ramie strains Erwinia CXJZU-120 and Bacillus subtilis T66 was performed on the optimal conditions by bio-degumming technology.The COD,degumming effect and extr…
Gold nanoparticles were fabricated by a green method using tannic acid as a reducing and protecting agent at room temperature.The tannic acid-capped gold nanoparticles were characterized by UV-Vis,TEM,XRD,FTIR,respectively.The results show that the maximum absorption wavelength increases and the absorption band broade…
Numerical simulations were conducted on the penetration of the long rod with the length-radial ratio of 5,the ideal segmented rod and the segmented rod with a carrier tube into semi-infinite steel targets,respectively,by using the software ANSYS/LS-DYNA3D.The Lagrangian method and Johnson-Cook constitutive model were…
The latest development of copper-based wear-resistant composite materials is reviewed,focusing on the type of copper-based wear-resistant materials and their preparation methods and enhancement mechanism.Ceramic particle-reinforced copper-based composite material has higher wear resistance,better high-temperature mech…
Shunt capacitor banks are widely used in power grid for reactive power compensation.However,the operating overvoltage caused by frequent operation of shunt capacitor bank would damage the insulated equipment and decrease the reliability of power system.The operation overvoltage on shunt capacitor bank is mainly referr…