Applied Mechanics and Materials Vols. 401-403

Abstract: Basing on the reinforcement of a practical project, which is a reinforced concrete multi-span cantilever girder bridge, by changing section properties to improve the bearing capacity and seismic performance of the bridge. Then, a finite element model is established and solved by using the subspace iteration method, the frequency and vibration type is compared that of the bridge before and after reinforcement, the effectiveness of the new method on the structural dynamic characteristic is verified at the same time. Then, the seismic response of the bridge is calculated and analyzed by using the response spectrum method, which can provide method for reinforcement of similar bridge.

Abstract: Titanium diboride (TiB2), which is characterized by a high melting potin,high stiffness, good wear resistance, has good structural and thermodynamiccompatibility with Al2O3. In this paper, Al2O3-TiB2 composite ceramics wereeffectively synthesized by mechanical alloying(MA), planetary ball milling of 26.25wt.% B2O3, 30 wt.% TiO2, 33.75 wt.% Al and 10 wt.% Ni. The phase transformationafter different milling time was conducted by X-ray diffractometry(XRD). The XRDanalyses exhibited that the Al2O3-TiB2 composite was formed after 12h milling time(BPR:10/1 and rotational speed of vial: 500 rpm). The results indicate that increasingmilling time up to 60 h had no significant effect other than refining the crystallite size.

Abstract: Cement deep mixing method is a normal ground treatment method. However, it is less applied on the soft clay ground improvement. The test was carried out to the strength of cement mixing soft clay. The soft clay was mixed with cement to become cement mixing soil. The strength of cement mixing soil was analyzed at different maintenance ages. As the results, the strength was lower than the anticipation value. After mixing additive, the strength of cement mixing soil increased, but it still wasnt reached the design strength demand. So, the cement deep mixing method is careful to be as a ground treatment method for the project with thick soft clay ground and high design strength.

Abstract: The reaction mechanism of raw dolomite was analysed.The test have been implemented.The effect was generalized.The result is: application of raw dolomite in converter can reduce lime 3.3 kg/t,light burning dolomite 7.2 kg/t,coolant7.4 kg/t,decrease cost 9.74¥/t.

Abstract: We propose the one-dimensional photonic crystal quantum well structure composed of two negative metamaterials, the features of which are investigated with scattering matrix method. With this method, the transmittance, reflectance and dispersion relation of electromagnetic wave propagation in photonic crystal are obtained. Moreover, the photonic band structure is given by dispersion relation. For photonic crystal parallel wells the sandwich structure (M^pN^qM^p) and four PCs structure (M^pN^qM^pN^q), the resonant modes exist in the photonic band gaps. The number of resonant modes is varied by changing the period number of the constituent photonic crystals. Meanwhile, the resonant modes is not sensitive to the incident angle increasing, only shift slowly to lower frequency region. Moreover, the resonant modes can be act as multiple ultra-narrow bandwidth filters.

Abstract: This paper makes a brief discussion on the selection basis of the engine oil and introduce the engine oil`s properties of mineral materials. With different engine types, the required engine oil performances may vary greatly; According to the test indications of coachs engine oil, the reasonably set change interval can make the best use of the engine oil.

Abstract: The strong yellow upconversion (UC) light emission has been observed in Ho³⁺/Yb³⁺ co-doped La₂(WO₄)₃ phosphor under the excitation of 980 nm diode laser. The phosphors were synthesized by the traditional solid-state reaction method. The phrase structures of the samples were characterized by X-ray diffraction (XRD). The doping concentration of Yb³⁺ was determined to be 20mol% for the strongest yellow emission. Then, the dependence of UC emission intensity on excitation power density showed that the green and red UC emissions are involved in two-photon process. The possible UC mechanisms for the strong yellow emission were also investigated.

Abstract: Analysis of mechanical properties of diamond-like carbon (DLC) films based on experimental designs was reported to optimize characterize by a magnetron sputtering. An orthogonal array experiment was introduced and the effects of deposited parameters on the films were systematically explored. The films were analyzed by scanning electron microscopy (SEM). Friction and wear tests were carried out using a pin-on-disk tribometer. In this study, the two stages such as adhesive and abrasive wears for tribological properties are clearly visible among L18 tests, where at the higher wear volume losses exist an abrasive wear while the less wear volume losses appear an adhesive wear. A slightly worn surface with a glassy carbon phase appeared and a lower wear volume loss became visible in the DLC films. Through the optimal design, the experimental results demonstrate the tribological properties on DLC multilayer films are increased by a magnetron sputtering, thereby justifying the reliability and feasibility of the approach.

Abstract: To study the effect of sample width on flame spread characteristics, a series of laboratory-scale experiments were conducted employing eucalyptus wood with width from 3 to 7 cm. Flame dimension, flame spread rate and mass loss rate were obtained. The relationship between these flame spread characteristics and sample width was explored. Both the dimensionless average flame height and depth vary as the-n power of sample width. With the increase of sample width, both the flame spread rate and mass loss rate first decrease and then rise. The minimum values appear when sample width measures 6 cm.

Abstract: In this paper, one-dimensional Ag₂V₄O₁₁ nanowires were prepared by a facile method and developed as a novel visible-light-sensitive photocatalyst for the disinfection of Escherichia coli (E. coli) under solar light irradiation. The as-prepared Ag₂V₄O₁₁ had uniform wire-like structure with large specific surface area and good visible-light absorption performance. Experimental results indicated that almost all (99.9%) of the initial bacteria were killed after 30 min reaction in the presence of 1 mg/mL Ag₂V₄O₁₁ under solar light irradiation. The photocatalytic mechanism was studied by active species trapping experiments, revealing that the hydroxyl radicals (·OH) played key roles in the inactivation of bacteria. This study provides a potential effective Ag₂V₄O₁₁ nanowire photocatalyst for water purification and other applications.