Advanced Materials Research Vol. 1035

Abstract: The sphere-like diamond microcrystalline-aggregates were fabricated by microwave plasma chemical vapor deposition (MPCVD) method. The ceramic with a Ti metal layer was used as substrates. The fabricated diamond microcrystalline aggregates were evaluated by Raman scattering spectroscopy, x-ray diffraction spectrum (XRD), scanning electron microscopy (SEM). The field emission properties were tested by using a diode structure in a vacuum. A phosphor-coated indium tin oxide (ITO) anode was used for observing and characterizing the field emission. It was found that the sphere-like diamond microcrystalline-aggregates films exhibited good electron emission properties. The turn-on field was only 0.55V/μm, and emission current density as high as 11mA/cm2 was obtained under an applied field of 2.18V/μm for the first operation. After several cycling operations, the field emission tended to stable characteristics of current versus voltage. The stability evolvement and mechanism are investigated relating to microstructure of the sphere-like diamond microcrystalline-aggregates films.

Abstract: The Mg-Al layered double hydroxide (LDH) with carbonate interaction was synthesized by the urea method under hydrothermal conditions and layered double oxide (LDO) was prepared by calcination of LDH. The LDO was used as adsorbents for the removal of lead from aqueous solutions. The X-ray diffraction patterns of the LDO demonstrate that the adsorption is significantly enhanced by reconstruction of its original layered structure in the presence of lead with the memory effect. The process involved a fast adsorption within three hours, followed by slower, more gradual and stable adsorption. The adsorption capability for lead is 6.26 mg/g. The results indicate that the calcined Mg-Al layered double hydroxide is an efficient adsorbent for the treatment of waste water with heavy metal ions.

Abstract: In industrial construction of loess area, rainfall is one of the important factors inducing excavated slope instability. Take an industry site excavated loess slope in northern Shaanxi for example, using Geo-studio in steady flow state to analyze infiltration characteristics and stability of a loess slope. The results show that: (1) The influence of the X direction maximum locate at the free face of slope foot, Y direction maximum locate at the top of slope. (2) The upper slope larger permeability coefficient, the lower the permeability coefficient is smaller, aquiclude almost have no permeability, shows that the slope is loose soil, particles with skeleton structure, easy water infiltration, the farther down the soil compaction degree is high, the worse the infiltration capacity into the water, the permeability coefficient is smaller. (3) It is easy to produce water flow in aquiclude and slope toe. Then, it soften soil, reduced the shear strength of the soil. It can explain that aquiclude and free face on slope foot always is the structure plane shear outlet of slope.

Abstract: Test results show that unloading failure is more brittle than loading failure, and rock samples suffer more damage under unloading failure, especially in high stress. Unloading failure leads to deterioration of deformation modulus, internal friction angle, and cohesion, whose values changes with the changing of stress state. Unloading stress-strain curves of sandstone samples could be divided into four stages, loading stage, unloading stage, brittle stress drop stage, ideal plastic stage, and well fitted by polynomials. There is springback deformation in the second stage, which decreases with increase of initial confining pressure. These test results could offer theory support for analysis of deformation and stability of actual projects.

Abstract: New energy generation parallel operation is an effective way for large-scale development and utilization of new energy generation. The instability of new energy, however, can bring a series of negative influence to stability of power grid. Adjusting the power fluctuations of new energy generation, achieving real-time output stable control, is one of the key technologies of stable operation. The hybrid energy storage system, including lithium ion battery and super capacitor, can reduce the fluctuation effectively. Then it can make new energy generation steady run. In addition, it can reduce the volume, weight and cost of the energy storage system compared with the single battery or super capacitor energy storage.

Abstract: Phase transformation of austenite continuous cooling process in low carbon high strength sheet steel has been researched by DIL805 thermal mechanical simulate. The Austenite continuous cooling transformation (CCT) diagram of steel has been determined by dilatometry and metallography. With the increase of cooling rate, ferritic transformation, perlitic transformation, bainite transformation and martensitic transformation have produced in the organization. Mathematical equations of phase transformation point-cooling rate and phase variable-cooling rate have been established and phase transformation model of high fit degree has been gained by regression calculation. The results show that calculated value and experimental value are nearly similar, so the phase transformation model is feasible.

Abstract: Surface state of transmission line is an important factor to the corona characteristics. Therefore, this paper using surface roughness as the experimental parameters, using Aluminum Conductor Steel Reinforced cable LGJ-400/50 as the experimental materials in wind sand environment, studied the effect of sand particles on the surface of LGJ-400/50 Aluminum Conductor Steel Reinforced cable though the wind tunnel experiment. According to the experimental results a line chart about roughness changing along with the erosion time is obtained. By using Matlab least square fitting function make the line chart into a curve so that trends can be clearly reflected. The results show that: (1) the curve can be divided into two parts: the fast rising stage and the stable stage, the stable stage is related to the formation of oxide layer; (2) when the attack angle is 30 ° surface erosion is the most serious and changes of surface roughness have a maximum value.

Abstract: This paper presents a study on the different PF resin content influence on properties of bamboo particleboard bambooceramics by precise shaving bamboo particles as raw materials. The results showed: the size (length, width, thickness and volume ) shrinkage ratio of bambooceramics and density reduction ratio gradually decreased with the rising of PF resin content, and its carbon yield ratio and MOR gradually increased.

Abstract: The micro-structural and formaldehyde adsorption abilities of pineapple leaf raw and degummed fibers are characterized by using SEM, FT-IR, chemical composition analysis and determination of acidic oxygen-containing functional groups and more other methods. Test results show that after being degummed, pineapple leaf fibers possess smoother surfaces, obvious grooves, better single-fiber separations and non-significant cross-sectional cavities. Hemicellulose’s characteristic absorption peaks disappear basically and their contents are reduced from 20.62% to 2.65%. The intensities of lignins’ characteristic absorption peaks drop and their contents are decreased from 3.68% to 1.20%. The locations of celluloses’ characteristic absorption peaks do not change too significantly and their contents are increased from 61.18% to 84.45%. The numbers of carboxyl, lactone and phenolic hydroxyl in acid oxygen-containing functional groups are reduced. Pineapple leaf raw fibers have higher formaldehyde adsorption abilities. After degumming, formaldehyde adsorption abilities of pineapple leaf fibers are similar, but all slightly lower than raw fibers.