Materials Literature
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A series of waterborne polyurethanes(WPUs)with 50% solid content were prepared through a prepolymer process.The properties of the dispersion and its film were characterized by Fourier transform infrared spectroscopy(FT-IR),particle size analyzer,X-ray diffraction(XRD),differential scanning calorimetry(DSC)and tensile…
High Mn-high Nb micro-alloyed steels were investigated by electron back-scattering diffraction(EBSD) to determine the effect of cooling rate and ausforming on the characteristic of misorientation and the distribution of high angle boundaries(HABs) in low carbon bainitic microstructure.The results indicate that there i…
The corrosion inhibition performance of sodium dodecyl benzene sulfonate(SDBS) to stainless steel in simulated cooling water containing sulfide and chloride ions was investigated by electrochemical impedance spectroscopy,polarization curves and Mott-Schottky approach.The results revealed that in simulated cooling wate…
于2004-2005年间对洱海水体的硅藻群落进行逐月监测及研究,共发现71个种,分属于18个属.硅藻群落结构的季节变化显著,主要优势种为耐营养的属种.不同季节的硅藻优势种类有明显区别,冬季的主要优势种为Fragilaria crotonensis,春季Aulacoseira ambigua与F. crotonensis的组合占优势地位,夏季以Cyclotella ocellata为主,秋季则A. ambigua与Cyclostephanos dubius组合为优势种.空间上除1#点外,硅藻分布虽然在相对丰度上存在一定的南北差异,但优势属种在全湖具有较好的一致性.说明洱海全湖的水质都已处于中富营养状态.对除1#点外的11个采样点的硅…
Aligned porous conductive carbon black(CB)/polyvinyl alcohol(PVA) composite is obtained through directional freeze-drying process in this paper.The result shows that the conductive property of CB/PVA composite does not obeys the universal percolation theory.The value of critical resistance exponent is not in the range…
A series of supported Cu-Fe catalysts with different oxides(ZnO,ZrO2,TiO2,SiO2,MgO,Al2O3) as support were prepared by co-impregnation method,and were characterized by XRD,N2-adsorption,H2-TPR and CO-TPD.Their catalytic performances for the synthesis of higher alcohols through CO hydrogenation were investigated in a co…
The transferring characteristics of current transformers(TA) are subject to possible changes due to DC magnetic bias caused by geomagnetic induced current(GIC)/high voltage direct current(HVDC).The particularity of TA saturation affected by the DC magnetic bias will severely impact the transformer differential protect…
Work-hardening charactenstics of GH4169 alloy with different δ contents were studied by high temperature tensile test and scanning electron microscopy.The results show that the working-hardening behavior of GH4169 alloy with different δ contents fits the Hollomon hardening law.The strain hardening exponent n of the al…
Based on the former research results,the green nephrite from Taiwan has been experimented by SEM,XRD and FTIR and the experimental results are compared with the green nephrite from Canada.The results indicate that the green nephrite from Taiwan mainly consists of tremolite,small amounts of actinolite and chlorite.The…
A new natural compound,3-O-β-D-glucopyranosyl-(1→2)-β-D-galactopyranosyl-(3β,5β)-pregn-16(17)-ene-20-one(timopregnane A,1),together with five known stroidal glycosides identified as timosaponin AIII(2),timosaponin BIII(3),22-hydroxy-5β-furost-3β,15α-diol-3-O-β-D-glucopyranosyl(1→2)-β-D-galactopyranoside(4),timosaponin…
It is urgent demand for the safety of the power industry to develop an high-performance long-lasting temperature vulcanized silicone rubber coating,which is one of the most important approaches of preventing flashover.The composition characteristics of RTV silicone rubber coating and the technical requirements of the…
Iodine recovery method from the extraction raffinate wastewater of 4-bromo-2-fluorine-iodobenzene production was studied.The distribution constant of iodine extraction by benzene,cyclohexane and other five extractants and the distribution curve of iodine extraction by cyclohexane were determined under the temperature…
The main factors influencing the corrosion of low alloy steel by adding H2O2 into seawater was studied through potentiodynamic polarization curves,rotating disk electrode tests,and weight loss method.The results showed that the corrosion rate was the highest when H2O2 was 0.8 mol/L and the solution temperature was 70…
The first-principles method based on projector augmented wave pseudo-potential and generalized gradient approximation was employed to calculate the ground state properties,elastic constants and electronic structure of face-centered cubic(FCC) Fe and Fe-Cu random solid solution alloys with Cu contents of 25%,37.5% and…
Al2O3 coatings embedded with SiO2 nanoparticles were produced on 7A52 aluminum alloy by adding SiO2 nanoparticles into the electrolyte.The effect of n-SiO2 on the growth kinetics of the micro-arc oxidized coating under the two modes of constant voltage and constant current was investigated.The results show that nano-S…
The silica aerogels composited with alumina nano-particles were prepared by sol-gel method and supercritical drying technique,using TEOS and alumina nano-particles as the precursors.The nanoporous mullite materials were obtained by the calcination of the aerogel monoliths at 1 200 and 1 300 ℃,and were characterized by…
High-strength lightweight materials with small-size pores were prepared using natural magnesium forsterite and composite Na2CO3+NaCl molten salt as raw material.The specimens were treated at 900-1200 ℃ for 10 h,and then dissolved in distilled water.The phase composition and change were determined by X-ray diffraction…
Right evaluation of the bond behavior between corroded reinforcement and concrete wrapped with FRP is a chief problem to confirm the effect of FRP confinement.96 test specimens with embedded reinforcing bars were strengthened by two layers of transverse CFRP after accelerated corrosion.The pullout tests on the test sp…
PET films have been widely applied in the field of LCD for their excellent properties.Since the functional PET optical films are made by coating functional layers on the surface of the PET films,the coating technology is one of the key technologies for the PET optical films.The progress in the research on coatings use…
A DFT study on the structural and catalytic properties of the SiO-H groups on SBA-15 molecular sieve was carried out.The geometry and IR spectra data calculated are identical to the experimental data.The electrostatic potential maps of the model clusters show that the H atoms of the single O-H groups on the surface of…