Advanced Materials Research Vols. 884-885

Abstract: This paper presented a new method of absorption-oxidation-reduction which used ferrous sulfate solution as absorbent, oxygen as oxidizer and urea as reducer to remove NO_X from flue gas based on the properties of Fe²⁺, NO, [Fe (NO)]²⁺ and urea. These properties included that Fe²⁺ and NO could produce [Fe (NO)]²⁺, furthermore [Fe (NO)]²⁺ was easy to be oxidized by O₂, as well as urea can reduce HNO₂ and HNO₃ in the absorption liquid. This research was to discuss its absorption and removal mechanism with the influence of the initial urea concentration, pH value, initial NO_X concentration and gas flow rate on the NO_X removal efficiency. The results showed that the removal efficiency of NO_X would increase when the initial concentration of urea and NO_X increased, while the pH value and gas flow rate decreased.

Abstract: Based on the galloping mechanism of transmission line, it is determined to use viscoelastic damping material and energy effects of TMD to suppress galloping. The dynamic mechanical properties of viscoelastic damping material is studied, with the operating environment of the transmission lines, high-and-low-temperature physics experiment is carried out, while the experimental study on mechanical properties is carried out with the developed viscoelastic damping elements. It is showed that the viscoelastic material meets the anti-galloping device performance requirements for materials, it has a good energy consumption effect, suitable for application to anti-galloping of transmission lines.

Abstract: The effect of the latent heat related to the rate of the solidification kinetics during solidification was investigated by using the heat transfer simulation. The latent heat was generated proportional to the amount of the fraction of transformed solid phase and directly affected the temperature compensation during solidification. The importance of the solidification kinetics was discussed by comparing cooling curves calculated using different solidification kinetics with experimentally measured cooling curve of A356 alloy.

Abstract: Metalworking fluids are prone to bacterial contamination during the operational time. They are unwanted due their impact on the quality of the fluid, health impact of the microbial toxins, pathogens and degradation products of fluid. Typically bacteria are eliminating by the adding of biocides, which could be also harmless to operators health. Ozone is used as a sterilizing agent in many industrial applications, mostly in water disinfection. Wide varieties of microorganisms can be treated by the ozone. Ozone, a powerful disinfectant, is very efficient to inactivate resistant microorganisms under low concentration and short contact time. We studied the application of ozone to sterilize two types of metalworking fluids (synthetic and emulsion) with avoiding of oxidation power of ·OH radicals which are generated during ozonation process.

Abstract: Before cutting into a single chip, we have tested LED chip with different electrode that is produced under the same condition. With drive current changes, comparing the intensity of light emission of LED chip and operating voltage about the two samples. The conclusion shows that the shape of electrode makes influence on the performance of LED, and the performance of circular electrode with angle is better. The result demonstrates that the better electrode structure of LED chip can improve its performance.

Abstract: In ( OH ) ₃, InOOH and In₂O₃ crystals were synthesized by hydrothermal method, using pure water, 1mol/L KOH and 5mol/L KOH as mineralizer, the fill factor of 35%, reacted at the temperature of 200°C, 250°C and 350°C respectively, and time of 24 h. The phase transformation rule of In ( OH ) ₃, InOOH and In₂O₃ was studied in different temperatures and mineralizer, and their morphology have been analyzed. When pure water was used, temperature was 200°C , the results showed that In ( OH )₃ crystalline phase was no obvious transformation and secondary crystallization, the crystal had nonspecific morphology. While temperature was 250°C and 350°C, the In ( OH ) ₃ crystal transformed into InOOH. When 1 mol/L KOH and 5 mol/L KOH was used, temperature was 200°C , the In ( OH ) ₃ crystal had secondary crystallization. In particular, the largest-scale crystal was about 20 μm, the smallest crystal was less than 200 nm when 5 mol/L KOH was used. InOOH crystal and a small amount of In₂O₃ were obtained in 250°C. When temperature reached 350°C , the In₂O₃ with cubic bixbyite structure was obtained, exposing the faces { 001}, { 010}, { 100} and { 101}, and the length of crystal side was more than 50 μm.

Abstract: Superhydrophobic film materials have recieved intensive attention owing to their wide applications in different areas. In the present study, nanostructured Ni film has been successfully fabricated with the assistance of an external magnetic field. X-ray diffraction analysis demonstrates that the as-prepared Ni film is presented in face-centered cubic phase and elmentary analysis indicates the as-prepared Ni film is pure Ni. It is found that ethanol in the reaction solution plays a key role in determing the morpholgy of the final products and ethanol is unfavourable for the formation of Ni film. The static contact angles of water on the as-prepared Ni film can reach ca. 146 ^o, implying that the film exhibits superhydrophobic property.

Abstract: Zn_1-xCo_xO crystals were synthesized by hydrothermal method with 3mol/L KOH as mineralizer. The fill factor was 35%, reaction temperature, 430°C and reaction time, 24 hours. When the Zn ( OH )₂ doped with CoCl₂ 6H₂O was used as precursor, many different shapes of Zn_1-x Co_x O crystals were obtained in the hydrothermal synthesis products. The Co concentration in the crystal was determined by electron probe, the atomic percentage of Co in the crystal increased as the concentration o f CoCl₂ 6H₂O in precursor increased. The measurement of magnetism was carried out by using a superconducting quantum interference device ( SQU ID ). It is found that the magnetization varies unobviously as the temperature rises below the room temperature. The hysteresis loop of Zn_1-x Co_xO crystals was obtained at 300K and shows the ferromagnetism at the room temperature.

Abstract: The annealing treatment of AZ91 cast magnesium alloy was carried out at 415°C for 24h and the alloy was then slowly cooled to room temperature in furnace. As a results, the coarse divorced eutectic phase distributed along the grain boundary dissolve into Mg matrix during the isothermal process, and the thin lamellar β-Mg₁₇Al₁₂ phase precipitates from the magnesium solid solution with a type of pearlite precipitation during furnace cooling. During the cooling process of annealing treatment, the number of β phases as perlite-type were increased with the furnace cooling time. In the early stage of furnace cooling, the β phase nucleated preferentially in the grain near the boundary, only a small quantity of β phase precipitates.In the subsequent cooling process, the rate of precipitate about β phase increased remarked as the time of furnace cooling prolonging, the number of β phase increases dramatically, and the lamellar β phase evenly distributes inside most of the grain.

Abstract: The authors have systematically investigated the effects of different annealing temperatures in Ar atmosphere on the SiO₂/4H-SiC interfaces by scan electron microscope (SEM) and energy dispersive spectrometer (EDS). Results show that the annealing temperatures are strongly correlated with the morphological and compositional changes of SiO₂/4H-SiC interface. Annealing at 600 °C can significantly improve the quality of SiO₂/4H-SiC interface. However, the sample annealed at 350 °C and 900 °C displays some particles. The reason for such improvement in the quality of the SiO₂/4H-SiC interface after moderate temperature annealing at 600 °C can be explained by the formation and consumption of carbon clusters and silicon oxycarbides during annealing.