Materials Literature
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End-group modified poly(trimethylene terephthalate) polyester(PTT-TFA) was prepared by the esterification reaction between the hydroxyl end-groups of PTT and trifluoroacetic acid at room temperature,and its thermal properties were investigated by using the differential scanning calorimetry(DSC).The results show that t…
Using waterborne acrylic resin as main film-forming material and hollow glass microbeads as heat-insulating filler,a waterborne monocomponent anticorrosive and heat-insulating paint was prepared by adding anticorrosive pigments.The optimal pigment-to-binder(P/B) ratio of the paint was 1.0 based on the results of elect…
Fluororubber(FKM) and silicone rubber(MVQ) blends were prepared by using fumed silica as a reinforcing filler.The Effect of content and specific area of fumed silica on mechanical properties,heat ageing properties and oil-resistant properties of FKM/MVQ blends were studied.The tensile fracture of the blends were obser…
In this article,the turbine cylinder of the 9F series GE company steam combined cycle unit as an example,outlines the reasons of the high and medium pressure steam turbine shell arm uneven load distribution . Provided a method that how to control the shell arm uneven load distribution in installation procedure. To avo…
A Keggin-type polyoxometalate [Mn(phen)3]2(H3O)[BW12O40]·2H2O was prepared under hydrothermal conditions,and characterized by elemental analysis,IR,TG and single crystal X-ray diffraction analysis.The title compound crystallized in a Monoclinic system,space group C2/c,a=2.728 5(3) nm,b=2.506 0(3) nm,c=1.633 66(18) nm,…
To effectively improve the enzymatic digestibility of carbohydrates in lignocellulose,the effect of the pretreatment conditions on the delignification and enzymatic digestibility was discussed with corn cobs as the investigated object and the feedstock soaking in aqueous ammonia under the modest conditions.The optimum…
Al-Ga-Bi-Pb alloy was prepared by adding elements such as Ga,Bi and Pb.The effects of different annealing and quenching conditions on the corrosion and polarization of Al-Ga-Bi-Pb alloy in 4 mol/L KOH solution were investigated by the methods of weight loss,AC impedance and open circuit potential determination.The cor…
Fashion functions and the role of female teachers of modern college are analysed in this article,and 5 fashion principles of female college teachers which are nice clothing styles,clothing colors simple and neat,simple and comfortable fabric,clothing accessories with harmony and unity,clothing worn in line with TPO pr…
In the assembling process of low pressure cylinder,a serious distortion defect happened,and its concrete condition was narrated in detail.The treatment plan and concrete implementation case were introduced to accumulate experience for the similar problem happening in construction hereafter.
By using the Roothaan-Hartree-Fock wave functions of atoms and the effective potential model, we calculate the elastic integral cross section and the momentum transfer cross sections for the scattering of low-energy electrons from complex atoms Xenon and Rndon. The exchange potentials we used do not need any parameter…
Tungsten oxide powders and films were prepared by sol-gel process.During the process,10%(ω) titanium oxide was added to prepare the hybrid tungsten/titanium material.After calcining at 300℃,the hybrid material was examined by X-ray diffraction and scanning electron microscope.In addition,gas sensing properties of hybr…
The composition of TB6 alloy ingots after heat treatment then water colling and air colling was analyzed. The results show that the segregation in the grain boundary is more serious than the segregation in the grain both in air cooled ingot and quenching ingot, the composition in grain boundary are not uniform; the se…
Poly(lactic acid)(PLA) was blended with poly(propylene carbonate)(PPC),a copolymer of carbon dioxide and alkyleneoxide,and modified starch in solvent,and a PPC/PLA/Starch blending film with improved toughness was obtained.Tensile tests of the films with different blending compositions show that,when the mass ratio of…
The narrow sense of cytoskeleton is the cytoplasm cytoskeleton which play an important role in maintaining life activities of cells.It's assembly and depolymerization are affected by pH value,temperature,concentration of calcium ions and so on.In this experiment,coomassie brilliant blue staining was used to preliminar…
AlN-cordierite glass composites were fabricated by hot-press sintering in vacuum at low temperatures of 900-1000 ℃.The influences of hot-pressing temperatures and volume percent of AlN on the microstructure and dielectric properties of the composite materials were investigated by XRD,SEM and LCR multifunction meter.Th…
The corrosion research methods,which consiste of static state dipping and electrochemical methods,were used to character the corrosion resistance of the carbon steel covered with Ni-P alloy using electroless plating method in alkaline solution.It was shown that the serious corrosion appeared on the surface of the carb…
Urea-formaldehyde(UF) resin was an important adhesive,which was widely used in wood industry.The formaldehyde content in urea-formaldehyde resin was affected by many factors.To find the proper technical condition to improve comprehensive properties of urea formaldehyde(UF) resin and the optimizing measures for obtaini…
According to The testing regulation for mean fiber diameter mean fiber length of regulated by IWTO,the mean fiber diameter or mean fiber length of the consignment of tops should be expressed as harmonic average.In the paper is introduced the basic concept of average,especially the relation between arithmetic average a…
ZnO-doped cordierite ceramic powder was prepared by solid-phase sintering.The effects of the sintering temperature and doping ratio on the infrared radiance were investigated with infrared radiation,X-ray diffraction(XRD),thermal analysis and infrared(IR) absorption spectrum.The results indicated that the acquired cor…
The hydroxy-tailed linear poly(butylene succinate)s(PBS) are synthesized by solution polymerization combined with melt polycondensation from succinic acid and 1,4-butanediol.Then the TDI terminated linear telechelic polyester prepolymers(TDI-PBS) are synthesized by toluene-2,4-diisocyanate(TDI) and PBS using solution…