Materials Literature
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The sales of excavators in China were up to 41,504 units(including export) from January to May in 2009,which decreased by 4.9% compared with 43,627 units,the sales in the same period of 2008.In the global economy depression,China's excavator market was concerned and envied by the world.The market in Heilongjiang can b…
Aiming at the price rising of the raw materials for sulfonated acetone formaldehyde polymer superplasticizer(SAF) and recycling utilization of paper pulp liquor,a kind of sulfonated acetone formaldehyde-lignosulfonate multipolymer superplasticizer (SAF-LS) is developed. The graft copolymerization between sulfonated ac…
A dinuclear copper(Ⅱ)complex [Cu2(H2tea)2-(dca)2]2·H2O(dca-=dicyanamide,H3tea=triethanolamine)was synthesized and structurally characterized by the single crystal X-ray diffraction method.Crystals of the title complex were of the monoclinical system,with a space group of P21/c,a=2.102 9(6)nm,b=1.272 5(8)nm,c=1.888 4(8…
Objective To prepare SiC films and analyze its luminescence properties.Methods SiC films were prepared on glass substrates by RF magnetron sputtering and then annealed in a vacuum annealing system.Photoluminescence(PL) spectra was used to analyze the film luminescence properties.ResultsTwo emission peaks were found at…
Recently,the numerical simulation technology has been widely applied in high speed cutting process and has played an important role in the investigations of technical parameters and machining mechanism.The study on advances in high-speed cutting process simulation technology of progress at home and abroad was reviewed…
Recently,the biodiesel has attracted a lot of attentions due to its environmental benign and renewable characteristic.In this paper,the properties of biodiesel were presented briefly.The merits and drawbacks of several production technologies of biodiesel were compared with each other.The supercritical methanol techni…
The theory of pore formation in porous anodic alumina (PAA) was reviewed. It was pointed out that the theory of acidic field-assisted dissolution (AFAD) was deficient in some respects, such as the interpretation of hexagonal cells in PAA. According to the oxygen bubble model of PAA, a satisfactory explanation for the…
Using a method of free energy minimization,the magnetization properties of the ferromagnetic monolayer and ferromagnetic(FM)∕antiferromagnetic(AFM) bilayer under the stress field have been investigated.And then the relation between the magnetoresistance(MR) of the Spin-Valve structure and the applied stress field was…
We deals with the preparation technics,heat stability,mechanism stability,pH stability,salt stability on the mixed emulsion of waterborne epoxy resin(WEP)and waterborne aliphatic polyurethane(WPU).In this study,the optimum mixed ratio is obtained by testing the property of the mixed emulsion.The distributing of the so…
An experimental investigation was conducted to explore two-phase flow and pressure characteristics in a horizontal PDMS micro-channel with a rectangular cross-section of 100 μm×100 μm.Pure glycerine and air were used as working fluids.The variation of slug velocity presents a scalariform form and the velocity suddenly…
The development of lost foam casting at home and abroad in recent years was introduced. Some advantages and disadvantages in lost foam casting technology were put forward combining with the situation of lost foam casting factories in our country, so that the foundries can exert strongpoint and avoid shortcomings. The…
Undifferentiated PC12 cells were used as an in vitro model to study the toxicity of methylmercury toward dopaminergic neurons.Methylmercury-induced cytotoxicity was detected by MTT assay.The morphological changes were observed by Hoechst33258 staining.The number of cells in different parts of the cell cycle and the ra…
The effect of pretreatment on the morphology,phase com-position,and corrosion resistance of phosphate chemical conver-sion coatings on Mg alloy was investigated by means of scanning electron microscopy,X-ray diffraction,and total -immersion test. It was found that pretreatment of Mg alloy with different systems contri…
Mg-Al hydrotalcites with different Mg/Al molar ratios were prepared,the adsorption experiments were carried out using benzoic acid,phenol,D-glucuronic acid and oleic acid as mimic anionic trash in papermaking furnish.The results indicated that the amounts of the benzoic acid and phenol adsorbed by LDH increase with in…
The application of Pd/C catalysis in fine chemistry industry was introduced in detail. The latest study and development at home and abord is summarized.
Ammonium persulfate as initiator, the tri-copolymer(ASV) was polymerized in aqueous solution, with acrylic acid, p-styrenesulfonic acid and vinyl acetate as the monomer. The influence on scale inhibition effect was further studied. The results indicated that the scale inhibitor of ASV terpolymer had a good scale inhib…
The intercalated compound VOPO4/16—Alkylamine is syntheszed in short time by means of ultrasonic method.The compound has been tested for its XRD,thermo gravimery,element, and IR spectra.A brief discussion has been made to the structure of material from the reaction and the influence of reaction time on the material fr…
Because of its rich texture and good warmth,slubbed wool fabric is well loved by consumers.But wool fabrics are easy to have some phenomenon of clothing size instability and felting in the process of wearing,which have seriously affected the appearance of fabric.Response to the above,this article takes further researc…
A precursor contained polytitanocarbosilane(TPTC) and an excess amount of titanium tetrabutoxide(TBT) was synthesized through the mild reaction of polycarbosilane with TBT at 200 ℃ for 5 h in nitrogen atmosphere.The polymer precursor was melt-spun at 160 ℃.The spun fiber was pre-heat-treated at 100 ℃ for 20 h,then cur…
In order to improve the anti-ablation performance of unsaturated polyester(UPR) inhibitor,an effective flame retardant-coated red phosphorus was added into the UPR inhibitor material.The anti-ablation characteristics of systems coated red phosphorus/nano-Mg(OH)2/UPR、red phosphorus/micro-Mg(OH)2/UPR、red phosphorus/Al(O…