Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Using 3,4-dibromothiophene as raw material,disubstituted thiophene intermediate with hydroxyl was synthesized by nucleophilic substitution and transetherification reactions.Then the novel thiophene monomer(EDOT-S) was obtained by openloop-substitued reaction to bring in sulfonic group.Characterizations of the monomer…
Agriculture has become the main source of greenhouse gas emissions.Evaluation on greenhouse gas emission of livestock in Chongqing was carried out,the results showed that,the greenhouse gas emissions of livestock were basically proportional to breeding quantity;and cattle were the key sources and had main contribution…
The crystallographic structures and form of phase transformations in ZrO2 ceramics are reviewed.The mechanism of stabilizing high temperature phase ZrO2 by means of doping other cations are introduced using Y2O3 as the representative.The mechanical performances of ZrO2 are introduced.It is pointed out that crystallogr…
In order to improve the mechanical property and Cl-+S2-corrosion resistance of B15 copper-nickel alloy,Cu-15Ni-xRE(x:0-0.1%by weight)alloy was prepared by adding rare earth(RE)in melted Cu-15Ni alloy using metal mould casting method.Optical microscopy(OM),electronic tensile testing machine,X-ray diffraction(XRD),scann…
Through accelerated corrosion tests,the damage processes of the concretes containing different mineral admixtures(high-calcium fly ash(HFA),ground granulated blast furnace slag(GGBFS)and silica fume(SF))in simulated acid rain solutions(pH =2)were investigated by sphere indentation and ultrasonoscope methods.The result…
Simulated experiment was conducted to study effects of chitin,humic acid sodium and black liquid of papermaking on soil microbial quantity and soil enzyme activities in different application amount(converted organic content 0.05,0.10g/kg).The results showed that compared with non-additives treatment,the activity of so…
According to the first law of thermodynamics,the equation of the critical strain of debonding was proposed in order to analyze quantitatively the effect of interfacial debonding on the viscoelastic behavior of composite solid propellant.The overall degradation modulus of composite solid propellant was obtained based o…
Effects of addition of 2% nitrogen in shielding gas on microstructure,susceptibility to pitting corrosion and stress corrosion cracking(SCC) of duplex stainless steel 2205 welded joints were studied by cyclic polarization curve testing,slow strain rate testing and SEM.The results show that the content of γ-phase decre…
Silk belongs to protein fiber. It is mainly composed of fibroin,sericin which coats outside the fibroin,and a small amount of impurities. In the process of using silk to manufacture silk fabrics,residual sericin and impurities should be removed by scouring process so as to facilitate the following dyeing and finishing…
The effect of sulfur on the hot ductility of Ni-Cr-W-Al alloy was investigated.A series of hot tensile tests were performed and the fractures and microstructure of the samples were observed.The hot ductility was evaluated from the reduction of area at high temperature.The results show that when sulfur content(mass fra…
The reasonable heating process before forging was established based on the material and dimension of hot die steel module.The heating process was numerically simulated with software Deform-3D and the process parameters were optimized adapting orthogonal test,and the temrature field and stress field during heating were…
A variety of partial discharge signals and interference signals in complicated electromagnetic environments of the substation cause difficulties to diagnosis the faults caused by PD in on-site detection.Separating partial discharge signals caused by different insulation defects are a basis for partial discharge patter…
ewage sludge incineration ash is comprised of large amounts of SiO2,a certain amount of P and many kinds of heavy metals.By utilizing sewage sludge incineration ash as the composition adjustment agent,nucleation agent and flux,glass ceramics with good mechanical performance and chemical stability were successfully syn…
A new-type of dopamine dimethylopropropionic amide(DMPA-DA) was successfully synthesized and then reacted with NCO-terminated urethane prepolymer.A series of polyurethane with different contents of dopamine were synthesized by changing the ratio between DMPA-DA and another chain extender 1,4-butanediol.The structure a…
The modified starch was prepared through the soluble starch wet graft vinyl acetate and the environmental friendly EVA sole foaming materials were obtained with the modified starch.The effect and structure of the modified starch was analyzed by FT-IR,grafting ratio and grafting efficiency,while the mechanical properti…
This article provides an overview of the subsidy policy development for biogas engineering in China and that of current subsidy policy in Germany.Economic and realistic analysis on the subsidy policy for biogas project were made.The theoretical basis of the financial subsidies were clarified.The impact of different po…
Graphene aerogel(GA)was prepared by sol-gel chemistry,and then GA/epoxy(EP)composites were prepared by sonicate-mixing method.The structure of GA was characterized by SEM,N2 nitrogen sorption tests, XPS and XRD.In addition,the effects of GA mass fraction on the thermal property and the conductivity property of the GA/…
This paper introduces the raw material for composite material ship,such as reinforced fibre,resin matrix and core materials.It outlines the design concept,design method and structure type of composite material ship,introduces the development of molding technique and nondestructive detection technique,and presents prac…
Benzoyl chloride,acrylic acid,N,N'-dimethyl-1,3-propanediamine and chloroacetic acid were used to synthesize acrylamidepropyl betaine.Zwitterionic polymer was prepared by ternary copolymerization of acrylamidepropyl betaine,acrylamide and hydrophobic monomers,the salt resistance of the zwitterionic polymer had been ev…
Datong Lake is the largest lake for aquaculture in Hunan province,which is rich in natural resource of Corbicula fluminea.The present study analyzed and evaluated the nutritional components in the soft part of C.fluminea in Datong Lake,the results of which will provide useful information in the proper development and…