Materials Literature
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A new Pd-based monolithic catalyst on cordierite honeycomb ceramics substrate without coating(Pd/cord) was prepared via electroless plating.The results of activity tests for catalytic combustion of toluene showedthat Pd/cord catalysts with low Pd loading had good catalytic activities: toluene could light off at 201 ℃,…
The SiO2/PMMA composite colloid microspheres were generated by a semi-continuous soap-free emulsion polymerization technique using the hydrophilic SiO2 microspheres with uniform size(230 nm)without silane coupling agents.The composite microspheres were prepared by polymethylmethacrylate(PMMA)as the shell and SiO2 as t…
In order to increase types of explosives detection based on nuclear quadrupole resonance(NQR),the detection method on black powder is researched in this paper.The results include NQR frequencies and some important detection parameters.Practical test shows this method is precise,so it is very useful to expand the appli…
The phosphors(Ba,Ca)2SiO4∶Eu2+,Mn2+ and(Ba,Ca)2-xMgxSiO4∶Eu2+Eu2+,Mn2+ with different ratios of Mg/Ca,Mg/Ba were synthesized by high-temperature solid-state reaction method.The influence of varing the ratios of Mg/Ca and Mg/Ba on the luminescent properties of phosphors is investigated.The emission spectra of all sampl…
The hot deformation behavior of P92 forging billet has been investigated at 900℃～1300℃,strain rate 0.5s-1～25s-1 and maximum deformation to 50% by means of hot compression tests on the Gleeble-1500D thermal simulator.Effects of hot deformation parameters on the stress strain curve,dynamic recrystallization microstructu…
The polymerization reactor pressure automatic control scheme for mass PVC plant were introduced as well as the optimized measures.
After years running,Erwangzhuang open-channel pumping station buildings' concrete structure surface become aging,just as denudation,carbonization.etc,especially the headpond,outlet pool(tailwater channel).etc are more serious.In order to prolong the service life of these buildings and make them continue to exert the e…
A new type of organic polymer-inorganic hybrid material zinc poly(styrene-phenylvinylphosphonate)-phosphate was designed and synthesized under mild conditions.The characterized results show that the new hybrid material is crystalline with regular layered structure,and the ideal structure model is proposed.A series of…
The process of rare earth lanthanum conversion coating for galvanized steel was studied by orthogonal experiment.The optimized passivation parameters were obtained as follows.the concentration of La(NO3) 30 g/L,H2O2 20 ml/L,pH 4 and passivation at 40 ℃ for 30 s.The corrosion resistance was examined by weight loss test…
A series of aqueous blocked polyurethane were synthesized.The condition of blocking reaction was first confirmed.The products were characterized by Fourier-transform infrared spectroscopy and TGA.The stability and miscibility of products were studied.
2009年1-4月, 高州水库发生了规模较大的粘质鱼腥藻(Anabaena mucosa)水华, 最高藻细胞密度达3.4×107cells/L, 并在2010年的同一时期再次出现, 这也是粘质鱼腥藻首次在广东省水库水体形成水华.为了解该水库蓝藻水华发生的特点, 本文于2009年8月到2010年7月对高州水库进行了逐月采样, 分析了水华发生期间蓝藻群落结构特征及动态.蓝藻群落结构在枯水期与丰水期差异显著, 蓝藻细胞丰度枯水期较高, 蓝藻优势种为粘质鱼腥藻, 并形成蓝藻水华, 丰水期蓝藻细胞丰度较低.在枯水期降雨较少, 水库水位与库容较低, 水力滞留时间急剧增加, 水体稳定, 有利于藻类的大量繁殖与生物量积累.同时水体透明度下降, 水…
A novel dual-phase(martensite plus bainite) wear-resistant casting steel for caterpillar band was designed and tested to overcome the shortcomings of high-Mn steel,such as the low mechanical properties especially the wear-resistant properties.The results showed that the microstructure of the specimens consist of marte…
The fire-retardant mechanism and modification methods of viscose fiber were introduced.And the research situation and application of fire-retardant viscose fiber at home and abroad were summarized.It pointed out that high-efficiency,environmental and durable would be the future direction of the research of fire-retard…
The properties of gravity casting AZ91D-0.4Ca-0.3Sr alloy with Gd in metal mould were studied by controlling the total strain amplitude under the conditions of the stress of ratio R equal to-1.In addition,the microstructure,phases,chemical constitute,fracture and low cycle fatigue behaviors of the magnesium alloy were…
There are several corrosive gases in most oil and gas fields,such as CO2 and H2S.The corrosions of CO2 and H2S are the main corrosion in gathering,delivering and disposing.The corrosive mechanism and influencing factors of CO2 and H2S corrosions are described,based on which several anti-corrosion measures are introduc…
In this paper,the overcooling austenite continuous cooling transformation curves(CCT)of two kinds of X80 pipeline steels(without vanadium steel and with vanadium)after thermal deformation were determined by Gleeble-3500 thermal simulator.The microstructure of the samples at different cooling rates was observed through…
[Objective]The aim was to fabricate more convenient antibacterial material which could be employed to work efficiently without both artificial and solar light irradiation.[Method]Co doped mesoporous TiO2 composite materials with anatase crystalline structural wall were prepared,and its structure of the materials was c…
A temperature corrected equation is developed to measure rheological parameters of the crystalline and amorphous polymer in torque rheometer,and rheological results were compared with capillary rheometer results.The results showed that the activity energy and flow index data measured with torque rheometer were in good…
Mn-Zn ferrites(Mn0.5-Zn0.5RExFe2-xO4) were prepared by oxide co-precipitation method using FeSO4·7H2O、 MnSO4·H2O 、ZnSO4·7H2O and RE2O3(RE=Y、Nd、Gd、Dy)、HCl as the raw materials,sodium hydroxide solution as the precipitating agent and hydrogen peroxide as the oxidizing reagent.The samples of Mn0.5-Zn0.5Fe2O4 were charact…
The non-covalent binding of carbon nanotubes(CNTs) was carried on by using amphiphilic polymer polyvinyl pyrrolidone(PVP).The results indicated that the highest adsorption efficiency of methylene blue on the CNTs occurred at pH 8 when PVP concentration was 12mg/L,while ionic strength had less effect on the adsorbent.T…