Materials Literature
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Crystal replacement modification to ZSM-22 zeolite was made in(NH4)2SiF6 aqueous solution of different concentrations.The parent and(NH4)2SiF6-modified ZSM-22 zeolites were characterized by X-ray diffraction,N2 adsorption-desorption,29Si MAS NMR,NH3 temperature-programmed desorption and FT-IR spectroscopy of adsorbed…
A series of supported NiM/γ-Al2O3(M= Fe,Mo) catalysts was prepared and characterized by nitrogen physisorption,H2 temperature-programmed reduction(TPR),X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),and H2 or NH3 temperature-programmed desorption(H2-TPD or NH3-TPD) techniques.The catalytic performances o…
Bias magnetic field is one of the key factors of longitudinal modes guided wave sensor based on magnetostriction.The optimal bias magnetic field is based on the material and excition condition.In order to keep the bias magnet performed in the optmized region,the magnetic field should be adjustable,and the detection si…
The nitrogen removal efficiency and influence factors of ferric-carbon micro-electrolysis process in treatment of high nitrate nitrogen and refractory organic pharmaceutical wastewater were investigated.The results show that media size,pH,Fe/C ratio,air-water ratio,reaction time and so on have significant effect on th…
An Al-doped zinc oxide (ZAO) thin film was prepared by sol-gel method, and then characterized by X-ray diffraction (XRD) and UV-Vis-NIR spectrophotometer. The effect of coating layers number, sol concentration, Al3+ molar fraction and annealing temperature on the near-infrared reflectance of the ZAO thin film were stu…
3–3 type porous lead zirconate titanate(PZT) ceramics were prepared by a gel-casting method and 1-3 type porous PZT ceramics were prepared by a freeze casting process with tert-butyl alcohol(TBA) as solvent and template.The microstructure was determined by scanning electron microscope and the pore-size distributions w…
In practical production,the hammerhead with single material can not satisfy the requirement of high hardness and high toughness at one time,and for the double-metal hammerhead,casting defects easily occur and the production process is very complex.To solve these problems,the large low alloy steel wear-resistant hammer…
In order to analyze the influence of the technologic parameters(such as the temperature,the pressure and the lay-up velocity) on the lay-up quality,a series of experiments were carried out with the self-developed automated tape laying machine,and the influence of each parameter was detected by the viscous flow formula…
A series of(Y,Tb)3Al5O12:Ce3+,Sm3+ phosphors were prepared by a sol-gel combustion method.The crystal structure and photoluminescent property under different Sm3+ concentrations were investigated.The results by Rietveld method of whole pattern fitting indicate that the structure of all the samples is a cubic garnet.Wi…
A device of simulating drop test was designed to study the safety drop of Φ98 mm×39 mm PBX-2 explosive under the shell confinement.The pressure change was measured by PVDF gauges.Acceleration change at two positions were obtained by PCB acceleration gauges.Ignition process was analyzed by high-speed motion pictures.Th…
Hyperbolic heat transport equation does not follow traditional Fourier heat conduction law and can be affected by thermal relaxation time.Dimensionless format of hyperbolic heat transport equation can be determined;one-dimensional transient heat transport equation can be solved by finite element method in dimensionles…
Melting of unfixed solid phase change material(PCM) inside a cylindrical tube was investigated.An analysis model of contact melting inside a cylinder tube with constant heat flux was established.Control equations of melting were established with Nusselt's liquid film theory,and dimensionless melting equations were obt…
Objective To compare the elemental components and mechanical properties of Beta-titanium alloy wires from four different companies.Methods Beta-titanium alloy wires from Ormco,Masel,Smart and GAC company were selected in this study.Energy dispersive microanalysis of X-RAY and SUPRATM 55 scanning electron microscope we…
The composites of AZ91 magnesium alloy reinforced with stainless-steel wire,whose volume fraction was about 40%,60% and 80% respectively,had been fabricated by melt infiltrating casting method.The mechanical properties of the composites were examined by Universal Testing Machine.The microstructures and fracture surfac…
All the approaches applied now in the field of grounding grid corrosion diagnosis are analyzed,and a theory based on dynamic chaotic PSO is proposed.Such an approach aiming at abnormal topological structure divides the whole grid into regular small parts,and uses circuit theory to construct the equation of diagnosis.A…
To evaluate welded joint defects qualitatively and quantitatively,the signal characteristics of metal magnetic memory(MMM) is investigated by comparing experiments between weld lacking of penetration and weld slag inclusion.The experiments were carried out on DSS-10T-S tension testing machine.Given are the MMM signal…
The fabrication of microlens array based on glass was studied and three factors of glass composition,etching method and mask material that affect the fabrication were introduced.The effects of the three factors were verified by experiments.According to the analysis,microlens array that meet the claims was manufactured…
Objective:To implant bovine jugular vein conduit containing living autologous cells into the canine pulmonary artery and to observe the influence in vivo environment.Methods:Tissue-engineered right ventricular valved conduit was constructed in vitro using the decellularized bovine jugular vein as the scaffolds,the can…
Serial cracks occurred at head when performing hydrostatic test.By using NDE,material analysis and microscope,the macro-surface of the broken head and metallurgical structure,corrosion body were analyzed.The analytical result shows that the major cause of the failure is the stress corrosion due to the combined effect…
Carbonation resistance of concrete is an important part of concrete durability.This paper mainly studies the complex mixed with ex-pansive agent and fly ash on the carbonation resistance of concrete discipline,and analyzes microstructure changes of concrete before and after car-bonation by mercury intrusion analysis,t…