Materials Literature
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Abstract Composition‐tunable Zn x Cd 1– x S alloyed nanocrystals have been synthesized by a new approach consisting of thermolyzing a mixture of cadmium ethylxanthate (Cd(exan) 2 ) and zinc ethylxanthate (Zn(exan) 2 ) precursors in hot, coordinating solvents at relatively low temperatures (180–210 °C). The composition…
The mesoporous TiO(2) solid and hollow spheres have been synthesized via a controllable and simple chemical route. Structural characterization indicates that these TiO(2) mesoporous spheres after calcined at 500 degrees C have an obvious mesoporous structure with the diameters of 200-300 nm for solid spheres and 200-5…
The effects of amount of pore former used to produce porosity in the anode of an anode supported planar solid oxide fuel cell were examined. The pore‐forming material utilized was rice starch. The reduction rate of the anode material was measured by Thermogravimetric analysis to qualitatively characterize the gas tran…
Os mecanismos envolvidos no processo de reparo de tecidos estão revisados nesse trabalho. O processo de cicatrização ocorre fundamentalmente em três fases: inflamação, formação de tecido de granulação e deposição de matriz extracelular e remodelação. Os eventos celulares e tissulares de cada uma dessas fases estão des…
DNA base-gold interactions are studied theoretically at the DFT level using Au(3) and Au(4) clusters as simple catalytic models for Au particles. The bonding between DNA bases and gold clusters occurs via the anchoring of a Au atom to the N or O atoms of the bases. In the most stable planar base-Au(3) complexes, the A…
The sulfuric acid dew corrosion- resistant steels are low alloying steels for heat exchanging component. There are two kinds of sulfuric acid dew corrosion- resistant steel:(1)base alloy elements-0.2%～0.5%Cu-＞0.010S adding a small quantity P,Sn,As, Sb,Se, or Te;(2)Cu-Cr or Cu-Cr-Ni steels for corosion environ ment of…
The numerical simulation of molten steel flow field in a 40 t tundish for alloy steel billet concasting at Shijiazhuang lron and Steel has been carried out using Computational Fluid Dynanics (CFD) software PHOENICS to modify the one weir structure which influence molten steel flowing to improved one weir and one dam s…
The pressurized induction melting of high nitrogen Fe-Cr-Mn-Ni austenite stainless steel has been tested using MgO crucible high induction furnace with nitrogen pressure 0.45-1.0 MPa between temperature 1640 (1913 K) and 1700 °C (1973 K) . The results showed that with 1.0 MPa nitrogen atmosphere at 1913 K the solubili…
The precipitation behavior in double tempering between 100 ℃ and 600 ℃ of 4~6Cr-2~4W-2～4Mo-1.5~2.0V and Cr-W-Mo-V+0.05~0. 10N serious semi-high speed steel (HSS) quenched at 1050 ℃ has been studied,in which the morphology and composition of carbides are analyzed by Transmission and scanning electron microscopy,energy…
Based on theory of similarity,the powder injected through top lance in RH-PTB vacuum refining has been simulated using 1:9 water model ladle(diameter-0.43 m,height to water surface-0.45 m)to study the effect of top lance gas flow rate,lifting gas flow rate of up-leg and height of top lance on injecting powder mixing t…
The 0.5 mm non-orientation silicon steel 50W470 (≤0.005C,1.45～1.65Si,0.2~0.4Al)coil was rolled by twenty- high Sendzimir mill from 2.0~2.8 mm plate with pass reduction 15%～35% and total reduction 75%~80%.The test results showed that with 5 pass rolling the grains in steel were all fibration,the tensile strength increa…
The variation of dissolved oxygen content in molten steel-[O] and inclusion ingredient of SWRM6 cold heading steel(≤0.08C,≤0.06Si,≥0.02Al) deoxidized refining by 2.5 kg/t Al block + 2.5 kg/t compound deoxidants or 5.0 kg/t AlMgFe block has been studied by 1kg MoSi2furnace. The results showed that at 1873 ℃ with dissol…
The wire for steel cord of tyre is a high carbon steel(0.70~0.75C-0.15～0.30Si-0.40～0.60Mn), which is widely applied to auto tyre and conveyer belt industries because the rubber products stengthened with 40.15~ 0.38 mm steel cord has excellent strength and springiness which is available to increase the safety of car an…
The 800 MPa grade ulra-fine grain steel is a kind of high strength-toughness low carbon(0.05%C) microalloying steel by the rolling technology of multi-directional thermomechanical treatment,large angle cross rolling,heavy deformation strain-introducing ferrite phase transformation,relaxation precipitation controlling…
The finite element simulation of heat transfer during heating of 250 mm x 280 mm x 6 000 mm concasting billet of 0.72C-1.30Mn high carbon steel U71Mn has been carried out and by non-linear regression analysis, the mathematical model for relation between decarburization depth d (mm) of steel billet with decarburization…
Ferrite rolling-warm rolling for ＜1.2 mm extra-thin hot rolling strip can save energy and decrease production cost. Current quick development of dun slab continuous casting and rolling technology contributes a good condition to develop and apply the ferrite rolling. Hie low carbon steel thin sheet and microalloying st…
Small colloidal silver spheres (diameter < 10 nm) were found to assemble into various silver nanoparticles including cubes, triangles, wires, and rods in water in the presence of HTAB (n-hexadecyltrimethylammonium bromide) at 120 degrees C, while the colloids were generated in situ on the basis of a HTAB-modified silv…
Abstract Layers of the polyelectrolytes poly(allylamine hydrochloride) (PAH, polycationic) and poly(styrene sulfonate) (PSS, polyanionic) are consecutively adsorbed on flat silicon oxide surfaces, forming stable, ultrathin multilayer films. Subsequently, a final monolayer of the polycationic copolymer poly( L ‐lysine)…
Abstract. Fertilizer and manure application rate and timing are often based on the optimal nitrogen rate and not on potassium (K) requirements. This can lead to excess or shortage of K depending on the crop and rotation. In grass‐dominated agricultural production, including many organic farming systems, K has become a…
Spider silk is predominantly composed of structural proteins called spider fibroins or spidroins. The major ampullate silk that forms the dragline and the cobweb's frame threads of Nephila clavipes is believed to be a composite of two spidroins, designated as Masp 1 and 2. Specific antibodies indeed revealed the prese…