Materials Literature
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The flame-retarded epoxy resin(FREP) containing ammonium polyphosphate/melamine/pentaerythri-tol(APP/MEL/PER) intumescent flame retardant and nano-magnesium hydroxide(MH) has been prepared,and the flame-retarded properties of FREP studied.Results show that the limiting oxygen index(LOI) value of the FREP increases wit…
Explorations engineering has proved that causticity of steel pipe caused by high content of hydrogen sulfide in gas well is uncontrolled risk factor. For the sake of the task of risk assessment for exploitation of gas well be progressed in a scientific way, it’s significant to carry on research of corrosion mechanism…
The research progress of phthalocyanine complexes,porphyrin complexes and schiff base complexes and other additives in the Li/SOCl2 battery were summarized.The catalytic mechanisms and effects of the reduction of SOCl2 by these additives were introduced.Future reseach goals were presented.
Using the theory and method of distance geometry to study the problems of stability of geometric inequalities for an n-dimensional simplex in the Euclidean space.From the deviation regular metric of two simplexes,we proved four important geometric inequalities for an n-dimensional simplex are all stable,and gave the s…
Flowerlike PbS nanoparticles were successfully in situ synthesizing on an eggshell membrane(ESM)by a home-made ions-exchange device at room temperature.X-ray diffraction(XRD),scanning electron microscopy(SEM)and fourier transform infrared spectroscopy(FTIR)were used for identifying the presence of PbS nanoparticles on…
This paper presents a new DTC technique of induction motor based on sliding mode variable structure.It uses sliding mode controller to produce the desired voltage vectors which can have any size and direction.Instead of using hysteresis controller and switch table to produce the few fixed voltage vectors which the tra…
Self-assembly of symmetric diblock copolymer AB/homopolymer A or C blends confined in spherical nanopores is studied by using a simulated annealing method.Three kinds of blends with different homopolymer chain lengths are investigated.Simulation results show that the self-assembly behavior of the blends depends on the…
Si3N4-AlN composite ceramics were prepared by hot-pressing sintering at 1 800 ℃ under 30 MPa for 1 h in nitrogen atmosphere with AlN and Si3N4 as raw materials and La2O3 as sintering additive.The effect of La2O3 content on sintering performance,bending strength,thermal conductivity and dielectric loss of the composite…
N610E grade steel(12MnNiVR) for oil storage tank is normally produced by reheating quenching and tempering process.Effects of tempering temperature on the microstructure and mechanical properties of the direct-quenched N610E steels were investigated by OM,TEM and other experimental methods.The results indicate that: a…
The surface performance and foam property of self made fatty acyl amino acid sodium surfactants were tested.The effect of macromolecular compound on the properties of sodium lauroyl glycine solution was investigated.The results showed that this kind surfactant had good surface activity,foaming and foam stability.There…
Objective To analyze the barite concrete mixing ration and estimate the medical accelerator room's effectiveness according to its shielding protection requirements.Methods Based on important shielding concerns of the 15MV accelerator room,the design and calculation of shielding protection were performed,with national…
Three edible composite coatings,named as M1,M2 and M3,were prepared using chitosan alone or together with cassava starch or corn starch as the coating carrier and acetic acid as the hydrophilous auxiliary agent,respectively,and used to soak mango fruits from cultivar Zihua before shelf-life storage at(20 ± 0.5)℃.The e…
The inhibition effect of Jasminum nudiflorum Lindl.leaves extractive(JNLLE) on the corrosion of cold rolled steel(CRS) in H3PO4 media was studied by weight loss method.Effects of inhibitor concentration(20~200mg/L),temperature(20~50℃),immersion time(6~48h) and acid concentration(1.0~10.0 mol/L) on inhibition performan…
The star-shaped initiator of octakis(2-bromo-2-methylpropionoxypropyl dimethyl-siloxysilsesquioxane(OBPS) was synthesized via hydrosilylation and esterification with octakis(dimethylsiloxy)silsesquioxane(Q8M8H),allyl alcohol,and 2-bromo-2-methylpropionyl bromide as base materials.The structure of OBPS was characterize…
The photoluminescence of n-type porous silicon fabricated with electrochemical etching method without illumination was investigated.Illuminating under an ultraviolet light with the wavelength of 325nm,the samples give the light emission centered at 620nm.The photoluminescence with orange-red color can be observed.The…
The software SolidWorks was introduced into the development of a parametric design system for reciprocating vacuum pumps,with VB used as a tool for secondary development.Three function modules were designed for the system,which can well achieve the parametrization and automation.An example was given to describe the me…
The surfaces of polytetrafluorethylene(PTFE) films were modified using non-thermal plasma generated by a homogeneous dielectric barrier discharge(DBD) at atmospheric pressure air driven by a μs pulse high-voltage power supply,and the surface properties of the untreated and DBD plasma treated samples were characterized…
A series of Ba0.905Ca0.845Mg0.25SiO4:xEu2+,yMn2+ phosphors were synthesized by the high-temperature solid-state reaction method.Influence of firing temperature and time,fluxing agent BaCl2 and dosages of Eu2+ Mn2+ on luminescence properties were investigated.A better preparation temperature was determined by the therm…
Climate change and the consumption of non-renewable resources are considered as the greatest problems facing humankind.Because of this,photocatalysis research has been rapidly expanding.TiO2 nanoparticles have been extensively investigated for photocatalytic applications including the decomposition of organic compound…
With the aid of analyzing interacted effect of rolling speed increment on looper systems in hot strip finishing rolling,the model of interconnected looper system was established.Based on H∞ control theory and considering the coupled effect between looper height and looper tension systems as disturbance factor,the loop…