Materials Literature
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Effect of restraint degree on the expansion and tensile splitting strength of concrete containing MgO-based expansive agent(MEA) were investigated.The wall thicknesses of the mold used to restrain the expansion of concrete specimen were 5,7,10 mm respectively.The activity values of MEA used were 60 s and 150 s,and the…
Formate dehydrogenase(FDH) was covalently attached to surface-modified polyethylene(PE) hollow fiber membrane.The effects of inlet way of CO2,pH value,the type of buffer solution,and the concentration of the reduced coenzyme nicotinamide adenine dinucleotide(NADH) on the synthesis of formic acid from CO2 were investig…
A novel three-dimensional isolation bearing(3DIB) was proposed,based on respective mechanical characteristic of lead rubber bearing,combined disc springs and rhombic steel plated damper.Firstly,the configuration department and mechanical design methodology was introduced;the horizontal and vertical stiffness and energ…
A bamboo(Sinocalamus affinis) fiber composite with high specific strength and stiffness can be used for load-bearing wind turbine blades.The composite is made from 3～4 year-old bamboo culms that have been reconstituted and hot-pressed.Specimens,ranging in density from 1.08 to 1.20 g/cm3,were tested for tension,compres…
Equivalent salt deposit density(ESDD) and non soluble deposit density(NSDD) are the basic data for outer-insulation coordination and pollution distribution classification,and it is hard to obtain the contamination data of charged composite insulator.In order to study the contamination characteristics on charged and un…
The ultra-high frequency(UHF) method is widely used for partial discharge(PD) detection in gas insulated switchgear(GIS).In this study,the metal spikes for producing PD signal were laid in the gas cells of circuit breaker,bus and incoming wire,and the sensitivity and attenuation characteristic of the UHF transducer we…
The processes of a high-speed projectile flying away from the bores through different muzzle brakes were numerically simulated by using the high resolution Roe scheme and the structured dynamic mesh techniques based on the two-dimensional unsteady Euler equation.The calculated results describe the evolution process of…
In order to investigate the relationship between the aging state of HV AC XLPE cable and the characteristic of space charge of XLPE,we studied the space charge distribution of HVAC XLPE cables under different aging modes.Moreover,we adopted pulsed electro-acoustic(PEA)method to measure the evolution of space charge in…
Dawson-type molybdovanadophosphoric heteropoly acid H6+n[P2Mo18-nVnO62](n=1～4) were prepared using the method of ethyl ether extraction,and the absorption efficiency of H2S by them was investigated under different conditions reflecting the effects of the number of vanadium,absorption temperature,concentrations of H2S…
The Cu/ZnO/Al2O3/Cr2O3+H-ZSM-5 performances for hydrogen production during dimethyl ether steam reforming(DME SR) were investigated,which was prepared by the co-precipitation coupling with mechanical mixing method.Meanwhile,the effect of calcination temperature on the physicochemical properties of catalysts were studi…
The molecular structures of calycosin,calycosin-O-β-D-glucopyranoside,formononetin and ononin are calculated by using the Density Functional Theory B3LYP method with 6-311G(d,p)basis set.The four compounds having good antioxidant activity to scavenge harmful free radicals for health are isoflavones from astragalus.It…
To reduce carbon dioxide emission of foundry industry,the carbon emission esource of sand casting production system was analyzed,and carbon emission evaluation boundary sand casting production system was built by combining the characteristics of sand casting process.Through analyzing the feature of sand casting produc…
The compatibility of ethanolamine and sodium carbonate with simulation formation water were studied,properties of emulsion were also studied when ethanolamine and sodium carbonate were used singly and combined with alpha olefin sulfonate sodium under 50 ℃ while the oil-water ratio was 7 ∶3.The results showed that no p…
The world natural graphite resource and its production,consumption,global trade is introduced.And it has an outlook for global graphite market and a brief analysis for graphite industry of China.
The surface of nano-SiO2 particles was modified with silane coupling agent 3-(methacryloyloxy) propyltrimethoxysilane(KH-570) under acidic conditions.Particle size analyzer,Fourier transform infrared spectroscopy(FTIR),ultraviolet visible spectrometer,and scanning electron microscopy(SEM) were adopted to characterize…
TypeⅠcollagen, as a number of collagen family, is the most abundant collagen and major components of the extracellular matrices of all metazoan life, and plays crucial roles in differentiation, formation of collagen fibers and tissue remodeling after injury, etc. Type Ⅰ collagen alpha 1(COL1A1) cDNA of grass carp (Cte…
Lead-free copper bismuth bearing alloys were prepared by powder metallurgy method.The wear and friction properties of the alloy were conducted by using the HDM-20 tribometer under boundary lubrication conditions,and tribological properties of the alloy were also analyzed.The results show that 3.0%Bi copper bismuth bea…
In view of the performance drawbacks of natural polymeric sesbania gum,chemical modification of sesbania gum was investigated for preparation of a derivative suitable for textile sizing.Oxidative degradation of natural polymeric sesbania gum was carried out by NaClO,followed by grafting acrylate onto it.The viscosity,…
Aulacoseira granulata,a highlighted centric diatom,belongs to Aulacoseira,Coscinodiscaceae,Coscinodiscales,Centricae,Bacillariophyta.Through the seasonal and continuous investigation for the Xijiang River at 2009,we found that Aulacoseira granulata had four variant forms in morphology: Aulacoseira granulata var.granul…
To guide the selection of measuring devices for loss measurement of large-scale power transformers and implement accurate loss measurement,the factors leading to the uncertainty during the loss measurement of large-scale power transformers are analyzed.Through quantitative calculation of uncertainties due to these fac…