Materials Literature
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Using the UMP2 /6-311 + G( 3df) method,eight optimized structures of FnLin+1( n = 1—3) with all real frequencies were obtained. The nonlinear optical( NLO) properties of the species were investigated. The results show that the hypervalent compounds have large first hyperpolarizabilities with β0 = 2299. 2—12322. 3 a. u…
Lattice Boltzmann method is employed to study nonlinear heat conduction problems.A kind of lattice Boltzmann model is derived in details and multi-scale algorithm and macroscopic quantity are selected.It is proposed to solve transient responses of nonlinear heat conduction problems.The relation between heat conductivi…
Objective To make a preliminary evaluation of the degradation of AZ31 bioabsorbable magnesium alloy stent implanted in the abdominal aorta of experimental rabbits.Methods Twelve AZ31 biodegradable magnesium alloy stents were separately deployed in the infrarenal abdominal aortas of twelve New Zealand white rabbits.Eve…
Nine kinds of materials,including granular activated carbon(GAC),peat,shale-haydite,mudrock ceramicite with size of 1 mm and 3 mm,kaolin clay,polyvinyl alcohol,fine sand and white sand were comparied for PRB reactive media testing.The results of the experiment showed that the reduction of TPH in groundwater by peat me…
The flashover of polluted insulators greatly threatens security of the power system. One of the preconditions for flashover prediction is to obtain the effective leakage current characteristics of polluted insulators, but there is still no consensus achieved on the relation between the flashover and leakage current ch…
A series of polyurethane(PU) elastomers based on polybutylene adipate(PBA) as soft segment were synthesized by bulk polymerization and solution polymerization.Their morphologies,shape-memory effect,thermal stability and mechanical properties were analyzed by means of FT-IR spectra,AFM,TGA,tensile tests and hydrolysis…
Chitin deacetylases (CDAs) are important enzymes that regulate ecdysis physiology,organ formation and anti-pathogen immunity during insect development.The full length cDNA of CDAs in Bombyx mori was cloned using rapid amplification of cDNA ends (RACE) method and its mRNA was identified to have two splicing variants,de…
Regarding to the composites revolving shell in the field of aerospace industry,path and coverability for automatic fiber placement (AFP) were studied.An analytical algorithm about the AFP path was deduced base on the general revolved body of mathematical model.Furthermore,the unfavorable effect such as fiber overlapin…
ZnO quantum dots were synthesized by Sol-gel method in non-aqueous system.The resultant ZnO quantum dots were coated by 3-Aminopropyl triethoxysilane(APTES) to obtain water-solube ZnO/Aminopropylsiloxane quantum dots(ZnO-AS QDs).The optimum coating conditions are determined to be as t =60 ℃,T = 30 min,nSi:nZn=1:1,VPEG…
The residual life prediction is one of the cores of the remanufacturing engineering. Metal magnetic memory testing (MMMT) is a highly promising tool in this field. This paper gives a presentation of results of basis theory researches on the essence of MMMT signals, the micro-physical testing mechanism. The prediction…
Supersaturated solid solution was formed after re-dissolution of precipitated phases during multi-axial compression in aged Al-Cu alloy.The re-ageing behavior of strain-induced supersaturated solid solution was investigated by transmission electron microscopy.The results show that the precipitation process of the stra…
The influence of lanthanum and cerium cations on the stability of Y zeolite was studied by X-ray diffraction, X-ray photoelectron spectroscopy, solid-state NMR spectroscopy, scanning electron microscopy, and energy dispersion spectroscopy. Although the stability of Y zeolite could be enhanced by the introduction of La…
A series of chalcone-containing copolymers with the solvent and temperature dual responsive fluorescence were synthesized by the radical copolymerization of N-isopropylacrylamide(NIPAM) and 4methacryloyloxy-4'-dimethylaminochalcone(DMAC) in THF solution using AIBN as initiator,and their structures were confirmed by FT…
In this work,iron(Ⅲ)-urea complex was synthesized in ethanol.The results of elemental analysis and Fourier transform infrared(FT-IR) spectroscopy suggested that the composition of resulting complex was [Fe(CON2H4)6](NO3)3.The thermal decomposition mechanism and product of the [Fe(CON2H4)6](NO3)3 were studied by using…
The space planar membrane array is gained more and more research attention for its remarkable characteristics. The numerical analysis procedures to introduce pre-stress into planar membrane were presented firstly. The pre-stress introduction effects on a triangular planar film reflect-array were evaluated as a typical…
The effect of strain rate and deformation temperature on the deformation resistance and the microstructure of TC18 titanium alloy was studied through heat simulating test at 700-950℃ and strain rate 0.001-50s-1.The results show that,when the deformation temperature increases or the strain rate decreases,the real stres…
Prof.Andre Geim and Dr.Konstantin Novoselov,both from School of Physics and Astronomy,University of Manchester,won Nobel Prize of Physics in 2010 in virtue of their great contributions to the discovery of graphene.In the past six years,great progress in preparation of graphene has been achieved,which has also demonstr…
Laser driven flyer method was applied to simulate the hypervelocity impact on polytetrafluoroethylene (PTFE) film with different thickness.The characteristics of hypervelocity impact at different velocity was studied by means of scanning electron microscope (SEM).100 μm thick PTFE film exhibits no radial crack under 2…
Carbon nanotubes have become ideal candidates for fabricating nanosized gas sensors because of their excellent mechanical, electrical, physical, and chemical properties, one dimensional nanostructure, high surface adsorption capability, superior conductive performance, and electronic ballistic transport characteristic…
Under conditions of different reaction temperatures,system pressures,additives and reaction time,the carbothermic behaviors and chloride behaviors of Al2O3 were investigated by XRD,gas chromatography,EDS and mass loss method.The results show that the gas forming in the process of carbothermic and chloride process is m…