Advanced Materials Research Vols. 129-131

Abstract: ERP systems have great influence on the tax auditing in enterprises implemented by the taxation authorities. This paper analyzes the influence caused by ERP on tax auditing and the countermeasures can be taken by the tax auditors. The major influence caused by ERP on tax auditing is as follows. The visible tax auditing clues reduce. The emphases of tax auditing should be changed. And the data collection of tax auditing becomes more difficult. In order to deal with the influence caused by ERP systems, the tax auditors should take the following countermeasures: Strengthen the controls before the establishment and during the operation of ERP Systems. Restrict enterprise's financial activities and tax behaviors according to the law. Choose tax auditing method carefully in ERP Systems. And develop tax auditing software adapted to the ERP environment.

Abstract: A study on solidification process of centrifugal cast high-speed steel (HSS) rolls and the crack forming condition is discussed. The result was represented that the crack forming was because of the solidification layer strength of HSS roll was low, and a clearance between the solidification layer and the mould, and the solidification layer of HSS roll could not endure a large centrifugal pressure. In common centrifugal casting, the free solidification constriction of HSS rolls was difficult, which accelerated the crack propagation. The appearance of mesosphere and axial solidification was unfavorable to obtaining the compact roll structures, which accelerated HSS rolls to crack.

Abstract: High-carbon high-speed steels (HSS) are extremely abrasion resistant materials due to their high hardness MC type carbide and high hardness martensitic matrix. Different microstructures and mechanical behaviours were obtained after the quenching and tempering temperatures of HSS roll were changed. With air cooling and sodium silicate quenching, when the austenitizing temperature reaches 1273K, the metal matrix all transforms into the martensite, Afterwards, the eutectic carbides dissolve ceaselessly into the metal matrix and its continuous network distribution changes into broken network. The peak hardness temperature of high-carbon HSS is around 1323K, and the second hardening temperature is around 793K. No significant change in tensile strength and elongation percentage was observed unless the tempering temperature is beyond 753K. The tensile strength is increased obviously and the elongation percentage is decreased slightly beyond 753K. However, the tensile strength is decreased and the elongation percentage is increased when the temp exceeds 813K. The high-carbon HSS roll presents excellent abrasion resistance at 793K-813K.

Abstract: Composite solid electrolyte systems composed of different compositions of lithium triflate (LiCF3SO3) as host, and cerium oxide (CeO2) as dispersoid were prepared using sol-gel method. The electrical, structural and morphological properties of the composite solid electrolytes were investigated using impedance spectroscopy (IS), X-Ray Diffraction (XRD) and Field Emission Scanning Electron Microscopy (FESEM). Maximum room temperature conductivity was obtained for the system of 60 mol % LiCF3SO3 – 40 mol % CeO2.

Abstract: On the basis of sufficient analysis to the characteristic of iterative learning control and PID controller parameter tuning, an idea of applying iterative learning control to PID controller parameter tuning was aroused in this paper, we choose the linear model around the character point of Roll Attitude controller as the research plant, transforming the problem of PID controller parameter tuning into the problem of open-close loop iterative learning control problem. The stability of PID controller parameter iterative learning control system and the astringency of controller parameters were verified for the first time through the construct of a compress mapping arithmetic operator, and a novel stop condition design scheme of integral type is advanced at the same time, the iterative learning of PID controller parameter was then successfully solved. The ultimate simulation study validates the correctness and the effectiveness of the theory.

Abstract: Based on the mass and energy conservation, the coupling dynamic model for interfacial reaction between slag and metal was established using metallurgical thermodynamics, dynamics and reaction engineering. The different influencing factors were investigated and discussed. The results of the model show that the mass transfer of Cr2O3 in the slag phase is suggested to be rate-determining and the coke as reducing agent should be supplemented in the slag continuously. The model described and resolved the process of chromium ore smelting reduction in a converter preferably. A reference and basis on the constitution of rational processing route for a practical stainless steelmaking were provided.

Abstract: Monoclinic Li3V2 (PO4)3/C cathode material has been synthesized by soft chemistry route and the electrochemical performance of this material was investigated. The structure of the particles was characterized by X-ray diffraction (XRD). The Li3V2 (PO4)3/C composite exhibits good cycling performance and excellent rate capabilities when cycled between 3.0 and 4.3 V. At 1C rate, the cell displays a reversible capacity of 117 mAh/g and retains 98.1 % of its initial discharge capacity after 50 cycles. At the high rate of 5C, the capacity could reach 109 mAh/g, corresponding to 93 % of that at 0.5C. Electrochemical impedance spectroscopy (EIS) technique was used to analyze the chemical diffusion coefficient of Li.

Abstract: ZrO2 nano sized filler of different amounts is introduced into solid polymer electrolytes of PVDF-HFP-LiCF3SO3-ZrO2. It is observed that the conductivity of the electrolytes varies with ZrO2 content and temperature. The highest room temperature conductivity achieved is in the order of 10-3 S cm-1 which is an increase of seven orders of magnitude compared to the conductivity of PVDF-HFP-LiCF3SO3 (without filler). The temperature dependent conductivity follows the Vogel Tamman Fulcher relationship which can be described by the free volume theory. Transference number measurements using DC polarization method show that the nanocomposite polymer electrolytes are ionic conductors. Differential Scanning Calorimetry results show that the degree of crystallinity is slightly affected by the addition of ZrO2 nanofiller.

Abstract: Diskspring was used in new type of laser optical mounts for reposition. Due to stress relaxation of diskspring after long period loading, the laser optical mount’s adjusting platform would have titling drift. When a mirror mounted on the platform drifts off the collimation axial in laser resonator, it will affect the laser from normal working. Generally, a complicated laser system has many optical mounts, accumulated drift of all adjustable elements will decrease laser’s output, even lead to stop lasing. In this paper, we proposed a method that is suitable for measuring stress relaxation of precision diskspring used for laser optical mounts, comparing with normal experimental facilities for diskspring’s stress relaxation test. We use a simple optical path design, which can not only be intuition, but also measure the diskspring’s creep deformation easily with high accuracy. Comparative experimental results for the creep deformation between no prestressing, treated by 5 short terms prestressing and treated by 24 hours prestressing are given. We found that the stress relaxation amount with prestressing is 1/12 of those without prestressing, and they change directly into the stable creep deformation stage, and can be used safely. This paper also gave a instruction to optical mount manufacturer that after the optical mount are assembled, tightening adjusting screw and keeping all the disksprings in a compacted state for 24 hours, then releasing before ex-factory, this is the best way to reduce stress relaxation in diskspring and will achieve higher stability of laser.

Abstract: Ultrasonic energy is spotlighted as a skill which connects detailed parts accurately and safely. So we designed the horn needed for attaching Tubular type of metal parts such as slip ring used for providing electricity for a body of rotation. We considered mainly booster’s size, slip-ring’s size, and nature frequency of horn. This design fixed the frequency given from ultrasonic metal welder as 40,000Hz, so it decided the approximate length of horn which makes maximum vibration amplitude through formula. And we designed the horn as a step shape with fillet for increasing the amplitude and decreasing stress concentration. Horn’s tip is designed 10mm length in view of the shape of slip-rings. And we calculated and analyzed the natural frequency by the modal analysis and harmonic analysis using Ansys that is analysis program. Through this study, we could examine the manufacturing possibility of the horn for ultrasonic metal welding of tubular type.