Materials Literature
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Anorthite /mullite composites were prepared by the in-situ growth method using the main materials such as kaolin,aluminum hydroxide and calcium carbonate.Effects of the sintering temperature and anorthite/mullite mass ratio on the properties of the composites were studied.The results show that the highest flexural str…
Asymmetrical mass abrasion is one of the dominant reasons to cause a projectile bending,yawing and break when it strikes a concrete target normally at high velocity.The spherical cavity-expansion model is employed to construct the transverse load in the case of asymmetrical mass abrasion.With considering the axis drag…
Lipids existed in natural rubber latex were extracted by organic solvents(choroform/methanol mixes).The β-sitosterol was separated after saponifing the lipids.Also the influence of β-sitosterol on aging properties and thermal stability of rubber were measured and studied.The results show that β-sitosterol is a natural…
Heat treatment process tests were carried out for ZG35CrMnSi steel pin rail according to the characteristics of ZG35CrMnSi steel.Mechanical properties of the pin rail after heat treatment were tested and compared,and a proper heat treatment process was determined for improving the strength and toughness of pin rail.Th…
Potassium dihydrogen phosphate(KDP) crystal was rapidly grown by point-seed technique.Indentation experiments on different faces of KDP crystal were carried out at a serial of loads.The anisotropy of microhardness has been studied.The results showed that the microhardnesses of KDP crystal on(001),(101) and(100) faces…
2009年5-10月期间对呼兰河湿地8个样点进行了5次藻类植物采样调查, 经显微镜观察, 共鉴定藻类植物158个分类单位, 包括148种10变种, 隶属于7门8纲14目23科50属.呼兰河湿地藻类群落组成以硅藻、绿藻为主, 藻类植物的细胞密度变化范围在469.55×105-847.35×105 cells/L之间, 不同采样点藻类植物种类组成及丰度的变化趋势不同.采样点Ⅱ藻类植物种类最多;采样点Ⅰ、Ⅴ藻类植物丰度较大.呼兰河湿地内出现的藻类多为普生性种类, 但出现了一定的富营养化污染指示种类, 结合Shannon-Wiener多样性指数H'、Pielou均匀度指数J评价结果初步推断, 呼兰河湿地水域受到一定的污染。;Monthly…
The Cu/Mo/Cu cladding metal materials were made by hot rolling.The interface structure,fracture characteristic and the effect of rolling process parameters on bond strength were studied by optical microscope,scanning electron microscope and electron-tensile tester.The results show that the bonding interface of composi…
The CO2 laser beam was used to weld ZK60 magnesium alloy plates.The microstructure,mechanical properties and fracture surface were investigated by optical microscope(OM) and scanning electron microscope(SEM).And the effect of processing parameters including laser power and welding speed on the welding quality was rese…
OLEDs were fabricated with a novel fluorene derivative material BDHFLYDFLQ as a molecular probe,exciplex emission was observed in devices with emitting peak locates around 542nm.However,OLEDs have low efficiency and brightness because of the existence of exciplex.In order to manipulate the strength of exciplex emissio…
In this paper,the interaction behavior of U-Mo/Al was studied with the diffusion-couple method,and the couple was continuously jointed by hot-pressing with special device.Annealing experiments were accomplished in a vacuum hot-pressing furnace,and at 550～570℃ for 5～21hours.The results show that the morphology and comp…
Stoichiometric Mg-doped Li2MnSiO4 cathode material was synthesized by a sol-gels process with magnesium acetate de-hydrate as a dopant and sucrose as carbon-coating materials and subsequent high temperature treatment in an inert atmosphere.The effect of Mg2+ doping on the physical and electrochemical properties of the…
In order to study the effects of overexpressing pea catalase(CAT) in tobacco chloroplast on drought and photooxidation tolerance,a binary vector harboring the gene fusion of tomato rbcS-3 and pea CAT was constructed,and the transgenic tobacco plants with high expression levels of rbcS-3 and CAT in chloroplast were gen…
A novel rare earth double perovskite-type catalyst(La 2 CoAlO 6 )was prepared by the sol-gel method using citric acid as complex agent.The catalyst was characterized by X-ray powder diffraction (XRD),H 2-temperature-programmed reduction(H 2-TPR),specific surface area(BET),scanning electron microscopy(SEM),Fourier tran…
Covellite copper sulfide microcrystallites were prepared by a template-free microwave hydrothermal method using Cu(NO3)2·3H2O and SC(NH2)2 as raw materials.The phase,morphology and optical properties of as-prepared samples were characterized by XRD,SEM and UV-vis absorption spectra.The results indicated that copper su…
The effect and the mechanism of phosphorus slag,granulated blast furnace slag and fly ash with different replacement dosage on the durability of sleeper concrete(resistance of freezing-thaw and resistance of chloride permeability) were demonstrated.The results presented that the resistance of chloride permeability of…
Uniform sphere of Y2O3 with average diameter of 160 nm was synthesized via urea precipitation method.The particles are spherical and monodisperse.The growth mechanism of the precursor was analyzed,and the effect of(NH4)2SO4 on the growth habit of the precursor microspheres was studied.The thermodynamic properties were…
Five Cu-Mn complex-oxide catalysts supported on cordierite(COR)monolithic,Cu-Mn-O/Al2O3/COR,Cu-Mn-Ce-O/Al2O3/COR,Cu-Mn-Zr-O/Al2O3/COR,Cu-Mn-La-O/Al2O3/COR,and Cu-Mn-Ce-Zr-O/Al2O3/COR,for the catalytic combustion of lean methane were prepared by wetness impregnation using cordierite as the support.The effect of promote…
Low carbon MgO-C brick containing Al/Si was trial used in 210 t steel ladle for refining quality steel and satisfactory service results were obtained.Phase composition and microstructure of the brick after use were analysed by means of XRD,SEM and EDS.The results show that the structure of the brick after use can be d…
Gd2O3 and Y2O3 co-doped CeO2-based solid oxide fuel cells(SOFC) electrolyte materials(CeO2)0.92(Y2O3)0.08-x(Gd2O3)x(x=0,0.02,0.04,0.06,0.08,mole fraction,the same below) were prepared by the solid reaction method and sintered at 1 600 ℃.Crystal structure,thermal expansion and ionic conductivity were characterized by t…
The effect of hydrogenation on structure and properties of TC4 alloy sintered body was researched by means of the room-temperature die forming and sintering in protection air using hydrogenated powder.A new progress for preparation of Ti alloy parts the by the combination of hydrogenation titanium alloy powder forming…