Materials Literature
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Chitosan was modified by chloroacetic acid,acrylic acid and 2,3-epoxypropyl trimethyl ammonium chloride to obtain amphoteric carboxymethyl-quaternary ammonium chitosan(CMQAC)and amphoteric carboxyethyl-quaternary ammonium chitosan(CEQAC),then the structures of the products were confirmed by IR,1H NMR and XRD.The perfo…
In order to improve stealthy capacity of a submarine,acoustic tiles are usually covered on hull surfaces of a submarine.Due to the special cavity structures in the acoustic covering layers,they will distort and absorb energy when encountering underwater explosive shock waves.They will greatly affect the submarine's an…
By using computational fluid dynamics(CFD) model,the centrifugal spray drying process for MTO catalyst production was simulated to have the humidity ratio,temperature,velocity and its vector distribution of hot air within 10s,the locus,the residence time and the particle size distribution of MTO catalyst in the centri…
The crystallization behavior and rheological property of r-PP modified with different amount of SBS were studied using DSC and ARES.The mechanical property and microscopic structure of r-PP/SBS blend were also researched.The experiment results showed that SBS could improve the toughness and the temperature of crystall…
Two-layer hydroxyapatite film was prepared on WE43 magnesium alloy surface by electrochemical deposition method.XRD results showed that the film consisted of flake-like CaHPO_4·2H_2O and spindle hydroxyapatite after pretreatment,and the film consisted of spindle hydroxyapatite and Ca(OH)_2 after hot dip process.Polari…
A chiral anionic amphiphilic compound derived from D-valine was synthesized.The self-assembly behavior of this compound in solution and in gel was studied using circular dichroism.Helical 1,2-ethylene-silica nanotubes were obtained through a sol-gel transcription method using the assembly of this chiral compound as te…
Three-dimensional models of fiber filter media made up of fibers with different arrangements were created with computer technology.And numerical simulation of the internal gas flow fields of the models under conditions of different solid volume fraction(SVF),different face velocity and different fibrous arrangement wa…
Activated carbons were prepared from Indonesia lignite under moderate temperature(400～580 ℃) activation condition with KOH as activation agent.The pore structure,crystallite structure and surface morphology of activated carbons were characterized by hypothermia nitrogen adsorption,X-ray diffraction(XRD),scanning elect…
The critical pitting temperature(CPT)and the critical protection temperature(CPrT) for 254SMO stainless steel and 2205 duplex stainless steel were investigated in solutions with 50 g/L,100g/L and 200g/L NaCl using potentiostatic and potentiodynamic measurements.Plots of pitting potential E_(pit)and passive potential E…
Envioronmental scanning electron microscope(ESEM)was used to observe the surface topography changes of AP at temperatures ranging from 150℃ to 240℃ at fast and low heating-up.The results showed that gaseous phase reaction on AP can be detected by ESEM.The pores appeared on the surface of AP from 150℃ to 170℃,and the a…
In the experiment,two different kinds of coated cemented carbide tools were used to cut austenitic stainless steel 1Cr18Ni9Ti;tool wear modalities and fracture surfaces were observed by means of SEM and EPMA;chemical composition of the abrasion area and fracture surfaces were analyzed.Using the same cutting parameters…
The effects of surface processing and heat treatment conditions on cellular recrystallization behaviors were investigated in a 2nd generation Ni-base single crystal superalloy after different surface treatment and then heat treating at 1000-1200℃ under vacuum condition.The results indicated that the cellular microstru…
Nnanocopper grains with three grain sizes were produced using the electric explosion of metallicwire method(EEW),and were characterized by Atome Force Microscopy(AFM).Then the tribological properties of the prepared nanocopper in lubricating oil were investigated,which results show that the nanocopper grain with bigge…
TaN thin films were deposited on Al2O3 ceramic substrate by DC magnetron sputtering.The effects of heat treatment temperature and time on the sheet resistance (R□) and temperature coefficient of resistance (TCR) of TaN thin films were investigated.The results show that the heat treatment temperature has great effects…
TATB-based PBX samples with different densities were prepared by different press process,and their position lifetime spectra were measured.The spectra show that the positronium formation is negligible in TATB-based PBX,therefore the 2-component fit is applicable.The result shows an increasing dimension but decreasing…
Elastic modulus is the inherent basic characteristics of vermicelli.It is not only an important parameter indicating quality evaluation,but also one of the principal indexes deciding dry vermicelli texture.Three methods,three-point bending,compressive rod post-buckling and tensile method,were followed in the determina…
Poly(carbonyl urea)oligomer is prepared by the ammonolysis reaction of urea and DMC(dimethyl carbonate) in autoclave with carbon dioxide filled.The highest product yield can reach 88.32% under the reaction conditions mentioned above.The only byproduct methanol can react with carbon dioxide directly to produce dimethyl…
In this paper,we have studied the structure stability of single-walled carbon nanotubes(SWNTs) with different vacancy defects concentrations by molecular dynamics simulations.The results of the study show that,when the concentrations of vacancy defects was under 6.25%,carbon nanotubes is stable and the energy ups and…
To biomimick the composition,core-shell structure and spinning process of the natural Bombyx mori silk,regenerated silk fibroin/sericin(RSF/SS) fiber with a core(RSF)-shell(SS) structure was preliminarily prepared by coaxial dry-spinning process.The morphology,secondary structure and mechanical property of the resulta…
In order to realize the recognition of different types of defects existing in butt welds in steel plates,magnetic flux leakage(MFL) method was used to detect different types of butt weld defects in steel plates with consideration on the characteristics of ferromagnetic weld.According to the principle of MFL testing,3D…