Abstract: The preservation of Synsepalum dulcificum has been researched by using chitosan coating as the antistaling agent at room temperature. The physicochemical indexes, such as rot rate, weight loss ratio, scavenging capability of DPPH• radical, total acidity and sensory quality, were assayed during the process of storage. The optimum formulation of the fresh-keeping agent was as follows: 1.5% chitosan, 1% ascorbic acid, 0.1% Tween-80 and 1.0% glycerol. The results showed that the coating films could effectively decrease the loss of fruit nutrition and weight-loss ratio, inhibited the respiration and delayed the senescent course during storage.
Abstract: Precipitates appear on fluorine-doped silicon oxide (SiOF) film when the film surface is exposed to atmospheric air. They are flake-type and hexagonal-shaped and show up rapidly after initiation, and then densely clustered. Energy-dispersive X-ray (EDX) analysis results of the precipitates show that mainly Si & O are detected. From the analysis of Raman spectra, the decreased intensities at about 600 cm-1 and 500 cm-1 post precipitation indicates the reduction of strained low-order ring structure in SiOF film. It is found that the dielectric constant of SiOF films initially increases at exposure to air and is attributable to the absorption of water, and then on the contrary a declining trend of the dielectric constant was observed after precipitation. From the Current-Voltage (I-V) characteristics, there is an apparent shift of the breakdown distribution to lower values of electric field for the SiOF films post-precipitation. Slight but appreciable reduction in hardness could be observed along exposure to air and precipitation. Precipitation on SiOF film at exposure to humid air is accompanied by reconstruction in structure, leading to further increase in film porosity and reduction in film rigidity.
Abstract: In this paper, Plated-like Bi4Ti3O12 particles with anisotropic properties were prepared by the NaCl-KCl molten salt method. The effect on microstructure and patterns of Bi4Ti3O12 particles was investigated by adjusting salt quantities, calcined temperature and excessive Bi2O3 content. The results show that the size of Bi4Ti3O12 particle and the degree of anisotropy of pure perovskite structure of Bi4Ti3O12 particles prepared at 750°C simultaneously increased with the quantities of molten salt and the temperature of the calciner. Excessive Bi2O3 content also shows a positive effect to obtain the anisotropic Bi4Ti3O12 particles whose preparation process was optimized.
Abstract: Based on the mechanism research of buildings corroded by the high salinity groundwater, this paper suggested that the corrosion problem can be solved by improving the anti-corrosion capability of the buildings in itself and reducing erosive medium. This paper put forward a repair technology which use the CM anti-Corrosion Composite Material to improving the anti-corrosion capability of the buildings in itself .The engineering practices demonstrated that this technology is worthy popularization for anti-corrosion of concrete buildings in irrigation areas.
Abstract: In this work, the fracture behavior of a multi-layered thin film structure under residual tensile stress is investigated theoretically. Using composite material theory and a modified shear-lag model, the analytical solutions for the distribution laws of the tensile stress developed in the first-layer thin film and the shear stress developed along the interface can be obtained. In addition, the crack density of the first-layer thin film can be derived from the residual stress and the mechanical and geometric parameters of the cracked system. This result also yields a measurement of the residual stress from the crack density and the mechanical and geometric parameters of the system. Finally, a numerical example is presented to show how the crack density varies versus the residual stress.
Abstract: Magnetically separable copper phthalocyanine/Fe3O4 (CuPc/Fe3O4) core–shell nano- composites were prepared by an organic-inorganic complexation technique, which could effectively catalyze photodegradation of the model pollutant methylene blue (MB), using hydrogen peroxide as oxidant under visible light irradiation. Moreover, the as-prepared functional nanocomposites could be easily separated from the photodegradation system by using an external magnetic field, which still kept high photocatalytic activity after 5 time’s continual utilization.
Abstract: The paraffin-polystyrene microsphere was synthesized by the suspension polymerization technology, the effect of the technics parameter on the diameter distribution of paraffin-polystyrene microsphere was studied such as the velocity of agitation, the heating rate and the reaction time. The results showed that the optimum velocity of agitation is 300rpm, the diameter of microsphere become littler and the distribution of diameter become uniformity with the heating rate become slower, the optimum reaction time is 3.5～4h.
Abstract: An attempt has been made to fabricate Ni-base alloy layer on the surface of TC2 titanium alloy substrate by laser repair cladding technology for repairing the worn surface of TC2 alloy after in service. Laser cladding is carried out by melting the preplaced Ni-base alloy powder using a continuous wave CO2 laser and using Ar as shielding gas. Microstructure and chemical composition of the cladding coating was revealed by optical microscope (OM), scanning electron microscope (SEM), together with the energy dispersive X-ray spectroscope (EDS). A clad layer with low dilution and metallurgically bonding coating to the substrate could be obtained. A significant improvement in microhardness is achieved in the cladding layer and at the interfacial region. The results showed that laser repair cladding is highly promising technology to restore damaged Ti alloy parts.
Abstract: Based on the complex variable method, the magnetoelectroelastic interaction of a generalized screw dislocation with an elliptical inhomogeneity containing a electrically conductive confocal rigid line under remote anti-plane shear stresses, in-plane electric and magnetic loads is dealt with. The generalized screw dislocation is located inside either the inhomogeneity or the matrix. The analytical-functions of complex potentials for stresses, electric displacement fields and magnetic induction fields in both the inhomogeneity and the matrix are derived. The image force acting on the dislocation are also calculated explicitly. The results show that the influence of the rigid line on the interaction effect between a generalized screw dislocation and an elliptical inhomogeneity is significant. In addition, the material behavior also plays an important role on the image force.
Abstract: Four kinds of Mg-Al-Sr alloys of Sr/Al mass ratio between 0.0～1.0 were made in the vacuum resistor furnace. The effect and effect mechanical of the ratio on phase and microstructure were studied by OM, XRD, SEM and EDS and DTA. Results showed that metallographic images of alloys changed and the microstructures were refined with different Sr/Al ratio. By analysis that can be known that precipitation phases include mainly Al4Sr and Al4Sr which varied from the Sr/Al ratio.