Materials Literature
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The vertical(z) and transversal(x) dispersion relations and group velocities of the Si/Ge superlattices were calculated by the lattice dynamical theory.We found that the dispersion relations are degenerated in the vertical direction but not in the transversal direction.We also found that the vertical and transversal g…
The microstructure of the deformed austenite was observed,and the recrystallization fraction of the austenite was measured by the optical microscope,the recrystallization diagram of GCr15 bearing steel was drawn.The influence rule of the deformation amount and temperature on the recrystallization behavior of GCr15 bea…
Amorphous catalysts were prepared by chemical reduction of ammonnium heptamolybdate within sodium borohydride aqueous solution under the condition of ice bath and ultrasonic,respectively.The resulting materials were characterized by FT-IR,Scanning electron microscopy,DSC,X-ray diffraction and X-ray photoelectron spect…
PLA is a well-known biocompatible and biodegradable polymer.In this paper,the advances on selection and use of catalysts for ring-opening polymerization of PLA are reviewed and the future work in this area is also evaluated.
The article mainly investigated the effect of RE modification and heat treatment on mechanical properties and structure of Cr cast steel through 960 ℃ ×4 h nomalizing after 0.25% RE modification.The abrasion were raised 66% .The main attribution to properties improvement is that the morphology changes from continuous…
Objective To investigate the inhibitory effect of earthworm fibrinolytic enzyme (EFE) on the metastasis of human hepatoma cells.Methods A metastatic model of human hepatocellular carcinoma in nude mice via orthotopic implantation was established.After the modeling for 7 days,the mice were divided randomly into the con…
A series of novel thermotropic side-chain cholesteric-liquid crystalline polymers(P1～P6) were synthesized by graft copolymerization of mesogenic monomer cholesteryl(M1) and nematic liquid crystal monomer(M2) upon polymethylhydrosiloxane.The chemical structure of polymers was characterized by Fourier transform infrared…
The BSA-PLG microspheres were prepared by S/W/O/W emulsion solvent evaporation method with biodegradable material PLG607 as the carrier.Drug encapsulation capacity,morphology,particle size characteristics,as well as in-vitro release profiles of the microspheres were discussed.The results show that the microspheres wer…
With oxalic acid or oxalic acid and sodium hydroxide mixture,the cobalt and manganese catalysts were recovered from P-xylene(PX) oxidation mother liquor by precipitation method,and oxalate precipitates were separated from the mother liquor by filtration.The influence of Oxalic acid amount,reaction temperature and reac…
The micro-hardness of Fe-Zn alloy films,which were obtained by electroless plating,has been investigated in the present paper.It indicates that the micro-hardness increases with the ratio of ZnSO4/(ZnSO4+ FeSO4)in the plating solution firstly and reaches a maximum when the ratio is about 0.47.Then it decreases with th…
Basing on the application of penetrant X in dyeing of the flax short fiber,the impact of salt,alkali,agent X on dye exhaustion and fixation rate,fiber intension and stainning fixation were tested and analysed.The results indicated that under the better process conditions all indexes lined with requirements of spinnabi…
According to the problems of insufficient strength,lower material utilization and higher processing cost when the internal gear is shaped by machining,process scheme of cold extrusion technique to form non-hole-through internal gear was presented. The scheme was divided into two kinds-cold extrusion for solid billet a…
The preapplied high strength and medium strength anaerobic adhesives were made by filling superfine calcium carbonate or silicon powder as filler in preapplied anaerobic adhesives.When filler amount was 6%by weight,the properties of preapplied anaerobic adhesive were the best.
By means of GaussView software,the models of β cage of Si24O36,Si12Al12O36 and Si12Al12O12-36 were constructed,and the adsorption micro-models of N2,CO and H2O on type-A zeolite were established.Using the Gaussian 03 program,the configuration optimization and frequency analysis were carried out at HF/cep-31g level.The…
Grain boundary segregation of solute atoms in superalloys is an important factor affecting the properties of superalloys. In the present paper, the progress in grain boundary segregation of solute atoms in superalloys is reviewed focused on Inconel 600 and Inconel 718, and the existing results and conclusions are anal…
Nonvolatile and reversible resistive switching of polycrystalline La0.67Sr0.33MnO3 (LSMO) thin films deposited on Pt/Ti/SiO2/Si (100) substrates by a pulsed laser deposition (PLD) process was investigated using voltage pulses with current compliance. Clear resistive switching cycles were observed in the Ag/LSMO/Pt sam…
Hot rolling in the conventional austenite region and in the ferrite region with lubrication,cold rolling and continuous annealing of Ti bearing ultra-low carbon bake hardening steels were experimentally studied.The results showed that the deep drawability could be improved while the yield strength and bake hardenabili…
The high temperature behavior of Ti-46.5Al-2.5V-1.0Cr-0.3Ni was studied by isothermal compression test at Gleeble-1500 thermal-mechanical simulator.The test conditions were T=1000-1200℃,=0.001-1.0s-1 and e=70%.Based on the corrected stress-strain curves,the influence of processing parameters on the flow stress was stu…
Objective To investigate the protective effect of corilagin on human umbilical vein endothelial cell (HUVEC) injury and its mechanism.Methods Platelet activating factor (PAF) was used to injure HUVEC in vitro.Cell viability was assessed using methyl thiazolyl tetrazolium (MTT) assay.The cultured cells were loaded by F…
Crystal structural defects of ZrO2 ceramic have been investigated by high resolution electron microscope(HREM) in combination with lattice image simulations.Based on the micro structural information of ZrO2 ceramic obtained by HREM lattice images and stoichiometric composition determined by X-ray energy dispersive spe…