Advanced Materials Research Vols. 490-495

Abstract: In partial discharge location system of cable, both original and reflected waves have been produced by the same PD location, there is an intrinsic link between them. Through the traditional correlation analysis can’t identify partial discharge pulse effectively, can’t well reflect the association characteristics between the original and reflected waves, such as the amplitude and pulse width. For the identification process of the original wave and reflected wave, this paper proposed short-term energy and DTW method. Experimental results show that the proposed algorithm is increased the efficiency and reliability of the identification of the original and reflected waves.

Abstract: The purpose of this research was to prepare Resveratrol-loaded Hydroxylpropyl-β-Cyclodextrin, and to solve solubility and stability limitation of Res. Res-loaded HP-β-CD was prepared by freeze-dryer , then its solution was adjusted to different pH value, and finally its identification and content were analyzed by UV spectrophotometer. Res-loaded HP-β-CD prepared here was water soluble, and after pH adjustment, its appearance was improved.

Abstract: A kind of antistatic composites were successfully prepared in large scale by the spraying construction technology, based on fluorocarbon coating, containing short carbon fibers (SCFs) conductive filler. The influences of resin viscosity, pigments and fillers on the dispersion of SCFs in fluorocarbon coating were studied. The degree of SCFs dispersion was charactered by dispersion coefficient. The results show that the higher viscosity redounds to the dispersion of SCFs in fluorocarbon matrix, and the suitable spraying viscosity should be controlled at 60s~100s (T-4 Viscosity cup); the discontinuous distribution of pigments and fillers plays a positive role to the dispersion of SCFs and hinders the reaggregation of SCFs.

Abstract: BiVO4 microcrystals were prepared via a microwave-assisted hydrothermal process. Ag loaded BiVO4 photocatalyst was prepared by a photoreduction process. XRD, UV-Vis-DRS and FE-SEM techniques were employed to investigate its’ phase composition, absorption property and morphology. The photocatalytic activity of the as-prepared samples was evaluated by the degradation ratio of Rhodamine B. The result indicated that the as-synthesized BiVO4 are spherical microcrystals built up by square nanoplates. After Ag nanoparticles deposite, the photocatalytic activity of BiVO4 was greatly enhanced. Furthermore, the photoctalytic activity enhancement mechanism was also discussed.

Abstract: With the intensity distribution of interference fringes formed by a capillary filled with transparency liquid, the variations in refractive index (RI) of nonlinear optical materials, corresponding to change of the intensity at the centre of fringes for a period, are deduced. Using this conclusion, we measure variations in RI of water solution of methyl orange (MO) excited by laser at 441.6nm. As an experimental result, the change of RI is 0.00216 and the corresponding effective index of refraction is -1.65×10-10 m2W-1. So, it can be used to measure nonlinear optical materials as a novel and simple method.

Abstract: Conductive films of multi-walled carbon nanotubes (MWCNTs)/Poly3-alkylthiophene (P3TH) composite films were prepared by in-situ polymerization of 3-alkylthiophene at the presence of soluble MWCNTs. The MWCNTs were safely obtained via a two-step process assisted by microwave radiation, which were soluble in organic media. The obtained composites were examined by FTIR. By using UV-vis analysis it was found that there are strong interactions between P3TH and functionalized MWCNT. The TEM images showed the MWCNTs were homogeneously dispersed in P3TH. In addition, the resulting MWCNT/P3TH composites showed an electrical conductivity at the level 10-3 S/cm.

Abstract: Low formaldehyde emission and high bonding strength were two basic criterions of a good urea-formaldehyde resin adhesive (UFRA). In our study, melamine modified methylolurea solution (MUS), was synthesized and used as modifier for UFRA. The bonding strength and formaldehyde emission of urea-formaldehyde resin adhesives(UFRA) were influenced by some factors such as F/U molar ratio of the main resin, F/U molar ratio of modifier, melamine content, mixing ratio of main resin with modifier, which were investigated by a series of single-factor experiments. The results showed that the best adhesive bonding strength of UFRA was 0.93MPa and the lowest formaldehyde emission was 0.43mg / L, when F/U molar ratio of the main resin was 1.5, F/U molar ratio of the MUS was 0.5, the mass fraction of melamine addition level was 5wt.% of MUS, and the mixing mass ratio of methylolurea solution (MUS) to the main UF resin was 20:80.

Abstract: The lubrication model of connecting rod small end is established based on AVL Excite Designer software. On the based the four-cylinder diesel engine, the key to the study is the variation of oil-film thickness between the piston pin and the connecting-rod bush. The relationship between the oil film and the engine rotate speed is analyzed, and the results indicated that variation amplitude of the oil film thickness becomes smaller by the engine rotate speed increases, and the average film thickness is increased

Abstract: In order to prepare a new type of anode material, stainless steel was selected as substrate material. The β-PbO2 coating on stainless steel substrate was prepared under the appropriate plating solution, and the PbO2-MnO2 coating was prepared with thermal decomposition. The crystal structure was determined by X-ray diffraction; Surface morphology was test by Scanning Electron Microscopy; the energy spectrum was used to determine element mass-fraction and the ratio of atomic number of the coatings.

Abstract: The lattices motion equation and Born-Huang equation was established with the framework of modified random-element-isodisplacement (MREI) model, and the relationship of dielectric constants of lattice vibration and FT-IR reflectivity spectra in ternary mixed crystals ZnS1-xSex with the changes of composition x are discussed. The two-mode behavior of long-wave length optical phonon was studied, and the relation of TO-phonon frequency and LO-phonon frequency with composition was obtained.