Advanced Materials Research Vols. 311-313

Abstract: The LiFePO₄/MWCNTs composite used as cathode was synthesized by ball milling. XRD and SEM experiments demonstrated that MWCNTs didn’t change the olivine structure of LiFePO₄ and that MWCNTs decentralized into the grains of LiFePO₄ and working as electric bridge improving the electrochemical properties of LiFePO₄. The electrochemical performance of the composite electrodes with different MWNTs in diameter were studied by button cell. The result indicated that the composite with largest diameter MWNTs exhibited best electrochemical performance. The first charge-discharge specific capacity of the composite with MWNTs of 60-100nm in diameter were 136mAh/g-1 and 129 mAh/g-1 respectively at 0.1C rate under room temperature. The difference between charge-discharge platforms of the composite electrode was the least compared to the others. This phenomenon showed that the material had the largest chemical diffusion coefficient of lithium. At the same time, the capacity of the composite only lost 4.0％ after 10 cycles and kept constant after 20 cycles.

Abstract: In high speed, the web press’s fold mechanism appears nonlinear dynamic response characteristics, which seriously affect the fold system’s stability and precision. The clearance and roller’s deformation are the main factors to cause the nonlinear dynamic response. To study the influence of clearance and roller’s deformation, the hypothesis of rigid role and spring combination is put forward. Based on the hypothesis, the dynamics model of fold system with clearance is established by kinematics and dynamics analysis. Through the dynamics model of fold system, the situation of pair clearance and roller’s deformation can be obtained, and the influence to the dynamic performance of fold system can be easily got.

Abstract: NiO/Al₂O₃, known as one of the most efficient oxygen carrier, has been fabricated by spray-drying method and calcinated at 1100 °C and 1300°C, and the structural characteristics are investigated using XRD, SEM, TEM and XPS. For the characterization of surface and bulk microstructure of the fabricated NiO/Al₂O₃ oxygen carrier particle, investigated were 1) as-fabricated powders, 2) internal structure of the crumbled particles, and 3) cross-sectional specimens. The results showed that the fabricated oxygen carrier formed well distributed NiAl₂O₄ with NiO particles of 100~500 nm via reaction keeping on the mole ratio. The oxygen carriers developed in this study showed pertinent characteristics for chemical-looping combustion, and good effect on the strength, indicating a potential for wide application in the future. The calcination at 1100 °C was good enough and as efficient as that at 1300 °C.

Abstract: Traction devices are power transmission components of railbound vehicle. This article discusses the gearbox mechanical properties numerical calculation and strength analysis. It established calculation model based on field test parameters. And it finished analysis about elastic deformation of large displacement and contact problem of nonlinear finite element method during numerical calculation. With comparison of energy strength theory and ASME VIII-2 standard, it chooses the suitable strength method for gearbox. With definition of key parameters, the mechanical properties numerical calculation results were given in different load conditions. According to displacement, strain and stress analysis, the gearbox strength is analyzed based on ASME VIII-2 standard. The results show: under field test loads, the gearbox satisfies strength requirement. But there is stress concentration phenomenon. During independent analysis process of gearbox, hanging and assembly, the results of displacement, strain and stress assume certain regularity.

Abstract: Based on current market of the holmium laser lithotripsy device power by manual control, the image recognition technology are presented by which are used in the stone therapy. ,in this paper，the core circuit, the external circuit and image recognition part of the circuit and software are discussed, and the corresponding Design ideas and programs is given. The system which can not only generate reliably, practically, high intelligently, but also can be widely applied to the treatment of ureteral stones, bladder stones and kidney stone.

Abstract: Electronic characterization, Electrochemical properties, Electrochemical techniques, Abstract. In this paper, the α-phase Ni(OH)₂ was directly deposited on the surface of foam nickel by electrochemical deposition technology. The characterization of the α-phase Ni(OH)₂ was studied by using X-ray diffraction(XRD), scanning electron microscopy(SEM), cyclic voltammetry(CV) and the constant charge-discharge. The specific capacitance of the a-phase Ni(OH)₂ electrode, measured using cyclic voltammetry at scan rate of 1mV•s^-1, was found to be 2826.77F•g^-1. For a simple supercapcitor, the highest specific capacitance(475.76 F•g^-1 at 30mA) is obtained at deposition voltage of 2.5V and deposition time of 50min.

Abstract: Ce_0.8La_0.2O_1.9-attapulgite (Ce_0.8La_0.2O_1.9-ATP) nanocomposite materials were synthesized by co-precipitation method. The microstructure and phase composition of the as-prepared samples were characterized by X-ray diffraction (XRD), Laser Raman spectroscopy (LRS), energy-dispersive spectrometer (EDS) and transmission electron microscopy (TEM). The redox properties of samples were investigated by phenol oxidation experiment. The results indicated that La³⁺ ions incorporated into CeO₂ lattice and formed solid solution. The Ce_0.8La_0.2O_1.9 particles with average size of about 10 nm were loaded onto the ATP and were widely dispersed. The catalytic activity was improved when La³⁺ was introduced. The catalytic property of Ce_0.8La_0.2O_1.9-ATP nanocomposites for phenol was better than that of CeO₂ and CeO₂-ATP.

Abstract: In this research, the acrylic acid (AAc) was grafted onto polypropylene (PP) fabrics with the gamma-ray (γ-ray) preirradiation. The effect of acrylic acid concentration, grafting time, grafting temperature were conducted to obtain the optimum carboxyl adsorber manufacturing conditions. Furthermore, the effectiveness of carboxyl adsorber for removal heavy metal ions using various operating conditions such as reaction time, pH and metal/carboxyl adsorber molar ratio was also evaluated in this research.

Abstract: An algorithm for extending B-spline curves with a sequence of ordered points constraint is presented based on the curve unclamping algorithm. The ordered points are divided into two categories: interpolation points and approximation points. The number of interpolation points increases gradually during the curve extension process. The most important feature of this algorithm is the ability to optimize the knots of the extended curve segment according to the ordered points. Thus, with minimum number of interpolation points, the maximum deviation of the extended curve segment from the ordered points is less than the given tolerance. The extended curve segment connects to the original curve with maximum continuity intrinsically. Several experimental results have shown the validity and applicability of the proposed algorithm.

Abstract: Activated carbon supported nano-TiO₂ photocatalyst material was prepared with activated carbon as the carrier and carboxyl methyl cellulose (CMC) as the binder. The results indicated that the optimal TiO2 loading percentage could reach 11.46% when the mass concentration of binder in the dipping solution was 15 g/L. Meanwhile, the optimal experimental results showed that the removal percentage of COD_Cr from papermaking midcourse wastewater could reach 71.43% under the conditions of 10 W of radiation intensity, 240 minutes of radiation time, 15 g/L of photocatalyst dosage, 4.0 of wastewater pH and 3 mL/L of H₂O₂ dosage. And the effluent was able to reach China national discharge standard Ⅰ. Furthermore, after three times of repeated use, the activated carbon supported nano-TiO₂ photocatalyst material still had a relatively high catalytic activity and stability, and the recycle percentage of the photocatalyst could reach 92.80%.