Materials Literature
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The phosphotungstic acid catalyst immobilizated on silylated activated silica ( HPW/KH-SiO2 ) was prepared and charactered by Fourier transform infrared absorption spectra ( FTIR) and scanning electron microscopy( SEM) .Methyl oleate was synthesized from oleic acid with methanol and the effects of preparation conditio…
Rice husk silica was prepared by burning the 10%(v/v)HCl treated rice husk at 600 ℃ and the remaining rice husk SiOh2 was amorphous with purity over 99%.The structure,morphologies,and size of rice husk silica were investigated by FTIR,SEM,and Malvern particle sizer,respectively.The results were compared with the fume…
Heat shock protein 70s( HSP70s) play an important role in folding,assembling,transfering proteins and degradating,regulating polypeptides of living things,and contribute to the protection of cellular proteins by functioning as molecular chaperones. Moreover,they take part in immune activity against pathogens,sensitive…
Optical-Electronic Printed Circuit Boards(EOPCB) is the trend of PCB,which has its great advantage of signal transmission between chips.Fluorinated Polyimides have ideal properties which make them become an excellent candidate and people's focus for applying in EOPCB.At the same,the characterization of this material w…
A novel substituent styryl pyridinium tetraphenylborate,4-N,N-dimethylamino-4′-N′-9-methano-anthracene-stilbazolium tetraphenylborate,was synthesized and characterized by means of IR,1H NMR,13C NMR,MS-EI and X-ray single-crystal diffraction.The compound crystallized in the monoclinic space group P21/c with a=1.255 7(1…
A three-dimensional half cell model is built by large-scale finite element analysis software ANSYS.The thermo-electric boundary conditions,potential and temperature distribution are analyzed.The differences between 3D and 1D calculation method are compared,and anode top temperature,anode cross-section current density…
Polypropylene sheet was irradiated with electron-beam to cause crosslinking and subsequently heated to foam.The effects of sensitizer content,the blowing agent content and irradiation dosage on the tensile strength of the sample were studied.The optimal technological parameters obtained by orthogonal experiments.The e…
Cracking causes of 250 mm continuous casting roller with 42CrMo steel were analyzed by macro-microstructure analyses.The results show that the main reasons for cracking are that there are a lot of casting defect and serious nonmetallic inclusions,and coarse pearlite and plentiful Widmanstatten structure because of hi…
A PAN-based carbon fiber was thermally oxidized in air at temperatures from 400 to 700 ℃.The chemical composition at the surface,the surface morphology,and the tensile properties of the resulting carbon fibers were investigated by scanning electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS),density measurem…
Reduced activation ferritic/martensitic (RAFM) steel is considered as the primary candidate of structural materials for the first wall of International Thermal Experimental Reactor (ITER) and fusion power reactors,many countries are developing different kinds of RAFM steels such as F82H and JLF-1 in Japan,9Cr2WVTa in…
Cu_2O nanocrystals had been successfully prepared using Cu(CH_3COO)_2·2H_2O as the starting material and ethylene glycol(EG) as the solvent and the reducing agent.The samples were characterized by X-ray diffractometry(XRD).The results shown that the crystallinity and the crystal size of products were greatly affected…
Triglyceride oils are the renewable sources.They can be obtained from plants,such as sunflower,cotton,linseed.This review discussed the polymers from triglyceride oils.Polymers from triglyceride oils are prepared via different strategies,including condensation,radical,cationic. This review has some introduction to the…
Aiming at the shortage of intermission of wood solar drying,a paraffin latent heat storage system with fork row tubes was added to an original solar drying equipment and the wood solar drying process was simulated on a small test stand.Preliminary study showed that: the wood drying rate was largest affected by air sup…
Phosphine is the potential antioxidant for jet fuel and can improve the stability of jet fuel at high temperature.The experimental results indicate in the presence of free radical inhibitor,the oxidation(120 ℃) of phosphine operation between phosphine and oxygen directly.Thermal dynamic data indicate the reaction occu…
A novel thio-containing polyurethane as macrophotoinitiator(PUS-HSM) was synthesized through step polymerization of 3,5-diamino-4′-thiophenylbenzophenone(DATBP),hexamethylene-1,6-diissocyanate(HDI) and N-methyldiethanolamine(MDEA).The benzophenone and coinitiator amine structures were successfully introduced into the…
[Objective] Aimed to study the nature,characteristics and ultrastructure of fibers of Ovis aries and several kinds of special animals.[Method] Wool,cashmere,alpaca,bactrian camel hairs,rabbit hair,mohair and yak hair were used as the experimental materials,and scanning electron microscopy was used to observe their sca…
Through building Polypropylene PP spunbonded polymer air drawing maths model,influence of spunbonded technic parameter to fiber diameter are discussed and different technics parameter are experiment.It is found that the less of extruding polymer,the more of polymer temperature,the more of air original temperature,the…
Optimized parameters of eletroless deposition of Ni-W-P alloy on NdFeB magnets were determined by orthogonal experiment,the optimal formula of electroless Ni-W-P plating bath was obtained as follows: 30 g/L of nickel sulfate,20 g/L of sodium tungstate,40 g/L of sodium hypophosphite,30 g/L of complexant,30 g/L of buffe…
Analysis ofαphase solution kinetics and solution microstructure characteristics were carried out by dilatometry and microscopic test.The results indicate that rapid heating treatment increases transformation temperature and velocity ofαphase solution.Evolution ofαphase during solution treatment includes solution,spher…
Nonlinear refractive index(n2),Absorption coefficient(β) are material figures of merit for ultrafast all-optical switch.n2 and β of GeS2-Ga2S3-Sb2S3-AgCl glass were measured by using Z-scan technique.The result shows GeS2-Ga2S3-Sb2S3-AgCl glass is characteristic with high value n2(1.581×10-10esu),little β at 800 nm(β=…