Materials Literature
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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…
The technology of urea-potassium hydroxide for pretreating wheat straw was studied in this paper.The dosages of urea and potassium hydroxide,temperature,time and liquor ratio were investigated in order to produce a chemi-mechanical pulp which the unscreened yield of the pulp was beyond 65%.The results shown that the c…
In wax printing,processes of pretreatment,wax printing,dyeing,dewaxing,cover printing,steaming and washing are introduced.Factors that affect product qualities are discussed.
A novel upconvertion luminescence agent,CaF_2:Na_xAl_yF_(x+3y)(0.3x0.5,0y0.1) without rare-earth elements was prepared by using hydrothermal method.The fluorescence spectrum and time-resolved spectrum tests showed that it can transform visible light(575～630 nm) into ultraviolet light(295~350 nm).The emission intensity…
The results of chemical composition analysis and hydraulic activity test of the high alumina content acidic GGBS and that of the normal GGBS were compared.The high content of Al2O3 contribute the high hydraulic activity during the hydraulic activitying process,thus the cement with high alumina acidic GGBS admixture ha…
The crystalline powders of Bi1-xLaxFeO3(x=0,0.05,0.10,0.15) were prepared by So1-Gel process.The crystal structure was characterized by XRD,and the surface morphology and size of the particles were observed by SEM.The complex dielectric constant and complex permeability of the samples were measured by microwave vector…
Under common demands of warship structure for fireproof,blastfroof and high velocity fragment resistance,the MCFS structure,a symmtrical multi-lays composite structure,which is made up of steel plate,heat insulation cushion and FRP,has been putted forward.The comparative experimental research for deformation and energ…
Foamed propellants have higher burning rate and insensitivity characteristic compared to conventional nitrocellulose-based propellants due to their unique cell structures.They can be used as high burning rate propellants and caseless ammunitions.Research progress of foamed propellants and main factors affecting their…
Polypropylene(PP)/ carbon black(CB) films were prepared via melt blending-masterbatch dilution method,assisted by a high-efficiency dynamic mixer.The thermogravimetric analysis(TGA) and color difference(CD) mettod,a potential on-line measurement new method,were employed to characterize the dispersion of CB particles i…
BaO-Nd2O3-TiO2(BNT) ceramics were prepared by solid state method.The effects of Bi2O3-SiO2-ZnO-CaO(BSZC)glass doping amount on the dielectric properties of BNT ceramics were investigated.The results show that BNT ceramics doped with 7%～9%(mass fraction) BSZC can be sintered at 960℃ with high frequency properties of er…