Materials Literature
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Shell-based ecological composite white cement was prepared by sea shells,kaolin and gypsum,then the performance of the clinker and the physical and hydration property of the white cement were studied by XRD,SEM and physical examination.The results show that the 28d compressive strength and whiteness of the white cemen…
Modification of activated carbon was carried out in a microwave device operating at different input power under N2 atmosphere.The effects of microwave heating on the pore texture and surface chemistry of activated carbon were analyzed by means of low temperature N2 adsorption,elemental analysis and Boehm titration,and…
Cryogenic treatment was carried out on 40CrNiMoA before and after tempering,the changes of microstructure and properties were studied.The results show that the strength decreases with the increase of ductility when the samples experience cryogenic treatment before tempering.However,the strength,ductility and toughness…
To analyse the influence of quaternary ammonium salt surfactant(QAS) on the performance of asphalt and asphalt mixtures,the pavement performance tests for QAS modified asphalt mastic and asphalt mixtures(AC-20C and ATB-25) was carried out.The results indicate that(1) QAS has no evident effect on the performance of the…
Measuring the leakage current of insulator strings is currently one of the principal means to monitor the contamination level of transmission lines insulator surface;however,due to the complex environment of transmission lines,a large amount of electromagnetic interference will produce much noise at the time of collec…
In order to solve the problems concerning both eddy current loss and local overheating in large power transformer,the three-dimensional(3D) finite element calculation of eddy current field was adopted to obtain the eddy current loss and its distribution for the fuel tank and clamps of transformer,and a magnetic-therma…
According to Parseval's relation,the formulas which accurately represent the signal energy expressed in the time domain and frequency domain are acquired under the circumstances that the sampled signal is processed by discrete Fourier transform(DFT).In order to make the Hanning window compatible with the group concept…
The microstructure evolutions,including changes of substructure,precipitates,and the effect of microstructure degradation on the high temperature stress rupture limit and hardness of T91 steel were investigated using the specimens taken from the thermal aging materials and exploded superheater tubes.Results show that…
Supercapacitor is a new energy storage device between conventional capacitor and battery,which po-ssesses wide application prospect and huge economic value.Electrode materials attract much attention because they are the key factor to the performance of supercapacitor.Research progress on electrode materials for superc…
The PAN-based carbon fiber(CF)bundles with 12K were treated continuously by a new equipment of electrochemical modification in 10%(mass fraction) NH4HCO3 electrolyte solution to improve its interfacial bounding strength without compromising the tensile strength simultaneously.SEM,XRD,XPS and Raman spectra were employe…
As a kind of excellent road bonding material,asphalt has been widely used in highway construction for many years.But asphalt is highly flammable and gives out a lot of smoke while burning.Its hazards cannot be ignored.To get safe application in the tunnel pavement engineering,we need flame retardant treatment on aspha…
3D carbon/carbon(C/C) composite materials with different porosities and bulk densities were fabricated by repeated precursor infiltration and pyrolysis(PIP) process,and the electromagnetic interference shielding(EMI) effectiveness of C/C composites at 8.2-12.4 GHz(X band) with different porosities were studied.The res…
As a non-thermal physical technique,ultrasonic technology has many advantages,such as short time,low energy consumption,effective conservation of the food nutrients and natural characters of color,smell and taste.Therefore,it would have wide prospect of industrial application.Ultrasound is able to inactivate microbe c…
Harmful chloride ionhloride ions in sea sand concrete are the main problems that hinder in its application.Sand concrete experiment were conducted using fly ash,ground slag and other active minerals mixed together,the working performance,mechanical properties and durability of different ratios of concrete have been re…
The technology of localized ultra-high frequency induction brazing is introduced.The effect of influence factors,such as material of ferrite core,gap and coil structure,on temperature in induction brazing are investigated and analyzed.An optimal combination of technological parameters is obtained through experiments.A…
The nuclear power plant and passive residual heat removal system were modeled and investigated with the advanced code developed from RELAP5/MOD3.2 code,for analyzing the influence of local natural circulation on the passive residual heat removal in nuclear reactor.The simulation results were validated with experimenta…
An asymmetrical bending control system of work rolls was designed to decrease the asymmetrical flatness defect of a cold-rolled strip.The influence function was adopted to calculate the deformation of the roll system and the effect of the lateral flow of metal in the roll gap on the transverse tension distribution of…
In order to investigate the crack initiation and development of 685 homogeneous steel under quasi-static loading and dynamic loading,quasi-static fracture toughness and dynamic fracture toughness were tested respectively by using quasi-static loading testing machine and modified Hopkinson bar and adopting three-point…
The microstructure and mechanical properties of a Q690D high strength steel quenched at different temperatures were investigated.The results show that when the quenching temperature is between 890 ℃ and 970 ℃,with increasing quenching temperature,the strength of the tested steel increases firstly then decreases and th…
Mannich base was synthesized from paraformaldehyde,cyclohexanone and aniline via aldehyde ketoamine condensation,then it reacted with benzyl chloride to obtain quaternary ammonium.The high temperature corrosion inhibitor CPA-10 was prepared from the quaternary ammonium,alkynol and potassium iodide.The best formula of…