Advanced Materials Research Vols. 156-157

Abstract: Based on the analysis of the working principle of the pressure foot (the cam- linkage compound mechanism) in a single-sheet feeder, using VB to develop the design of cam mechanism, a mathematical model of optimization design is set-up in which the object function is the minimum deviation between the real locus of the pressure foot and the required locus. The resolving method for this model is also studied with one real example. It is practically valuable.

Abstract: The recycling process of waste textile fiber materials could be divided into two parts: one is that waste textile fiber materials turn into recycled fibers, and the other is the use of recycled fiber process. To solve the first problem, it’s important to classify it in a reasonable way. In accordance with the main characteristics of fiber materials, new model of classification is established through three elements: color, finishing agents and twist. According to the new model of classification and different requests in recycled fiber, twenty-seven methods are proposed. Furthermore, taking waste polyester fiber materials as an example, economic cost analysis is used to assess the feasible ways in recycling waste fiber materials.

Abstract: Nickel was loaded on the activated carbon fiber(ACF) surface, by adsorption and sintering. In order to change the chemical functional groups on the carbon fiber surface, and increase catalytic oxidation capacity and removal efficiency of activated carbon fiber to element mercury. The samples of ACF were characterized before and after loading, using XPS and XRD. The results show that the nickel content in the ACF surface was 3.36at.%. The presence of nickel form was NiO and Ni. The adsorption ability of elemental mercury before and after modification was also studied. The breakthrough time was greatly extended after loading. At 95 , the ACF loaded nickel showed the best adsorption performance.

Abstract: A new process was investigated which combines both fast pyrolysis carbonization and CS activated carbons with H3PO4 activation (CSAC). ACs were obtained as by-product from the preparation process of bio-oil with fast pyrolysis under different temperatures (T=727–973 K), in which the reaction ended in a very short duration. A two-step process of reaction is proposed to govern carbonization and activation: firstly fast pyrolysis reaction removing disorganized material was associated with considerable weight loss but with low generation of porosity, pyrolysis/carbonization under the flow of N2 is suggested to ensure fluidization of CS powders and bed material, enhance decomposition of raw material, initiates controlled gasification at different temperatures. Then H3PO4 activation process dominated at 573 K, which leads to considerable evolution of porosity. In this research, the adsorption characteristics were determined from N2 adsorption isotherms and subsequent analysised by the BET-and BJH-methods. As a result, the iodine adsorption number of AC was 1310 mg/g and the SSA of AC was 1421.38 m2/g .

Abstract: The lithium vanadium phosphate (Li3V2(PO4)3 solid cathode materials were synthesized by microwave-heated sol-gel method using lithium hydroxide, ammonium metavanadate, phosphate and citric acid as starting materials. The test was conducted with orthogonal experiment method. The optimal conditions for (Li3V2(PO4)3 synthesis were determined to be microwave heating time of 10 min, microwave power of 700 W, Li/V molar ratio of 3.05:2.0 and pH value(gel solution) of 7.0. The synthesized (Li3V2(PO4)3 under the optimal conditions demonstrated perfect crystal growth and good electrochemical performance with initial charge/discharge specific capacity of 172.42 mAh·g-1/154.93 mAh·g-1 and discharge decay rate of 2.25 % after 50 cycles. The lithium ion diffusion coefficient was determined to be 1.434 ×10-8 cm2·s-1 by electrochemical impedance spectroscopy and mathematical models derived from simulative equivalent circuit.

Abstract: The mathematical model of the twist drill flute is discussed in the paper. The cutting tool path to machine the twist drill flute is obtained under the certain parameters in UG. And the NC machining of the twist drill flute is simulated too. After post-processing, the NC code is obtained and it is verified by virtual manufacture.

Abstract: The platinum (20% in mass) and ruthenium(10% in mass) catalysts supported on single-walled carbon nanotubes (SWCNTs) were prepared by liquid reduction method. The optimum technical conditions for purifying the SWCNTs were experimentally selected to be: nitric acid concentration of 4M, reaction temperature of 103°C and reaction time of 12 h. The optimum technical conditions for preparing 20%Pt-10%Ru/SWCNTs were determined to be: H2PtCl6–RuCl3 concentrations of 0.005 g·cm-3– 0.005 g·cm-3 and temperature of 60 with the purified SWCNTs as carrier. Under the optimum preparation conditions, the synthesized 20%Pt-10%Ru/ SWCNTs has smaller average catalyst particle diameter(d), larger specific surface area(α) and higher power density(P) (d=2.1nm, α=136.31 m2·g-1 and P=117.1 mW·cm-2·g-1) than 20%Pt-10%Ru/C (JM) ( d=2.4nm, α=119.27 m2·g-1 and P=75mW·cm-2·g-1 ), 20%Pt-10%Ru/MWCNTs ( d=3.0nm, α=95.42 m2·g-1 and P=67mW·cm-2·g-1) and 20%Pt-10%Ru/C (d=3.1nm, α=92.34 m2·g-1 and P=63mW·cm-2·g-1), respectively.

Abstract: In the different types of pipe network, the running performances of the variable flow pump were calculated, using pipe valve control, the number of units control and the frequency control to adjust water flow of system, and the impacts of pipeline types on energy consumption of variable flow pump were discussed. The relationships between performance of the pipe network and pump operating condition were analyzed, including the relationship between various flow control methods and pump energy consumption. The calculated results show that the pipe characteristic produces a great impact on energy consumption of variable flow pump. The adjusting flow of system by increasing pipe resistance can also reduce pump’s energy consumption, and the amount of energy reduced is greater in closed circulation pipeline than in open type pipeline. The variable frequency drive mode has big and different impacts on energy consumption between closed circulation and open type pipeline, the greater the static pressure value, the smaller the energy saving effect. The number control and the frequency control for pump are two effective methods of energy adjustment in the loop pipe networks, the change rates of power and flow do not meet the similarity law dew to the pipe network changed.

Abstract: According to the motion characteristics of 4-axis CNC machine tool, this paper studies a new way for manufacturing the mushroom turbine blade boot .It must rotate the turbine blade to ensure the tool axis consistent with the normal of the interpolating point on the arc of the blade boot, and move the tool to keep the cutting point in contact with the interpolating point. Meanwhile, this paper researches an algorithm to calculate the tool path in the MCS, According to this algorithm, a program with R variable parameter for manufacturing the mushroom turbine blade boot is provided.

Abstract: As an example to belt conveyor drums, this article introduces a parametric drawing method. The method uses inlays language VBA to secondary develop AutoCAD and achieves the design process of components through the procedure. The parametric design method reduces the designer’s duplicated drawing works which carried on to some kinds of components, and enhances the drawing quality and efficiency.