Advanced Materials Research Vols. 798-799

Abstract: A kind of modules with single tubular silicone rubber membranes was combined into membrane osmosis extraction for the treatment of p-hydroxy benzoic acid aqueous solution. Mass transfer process of p-hydroxy benzoic acid through membranes was studied. Based on the resistance-in-series model, the overall mass transfer coefficient (K_ov) across membrane was calculated. The effects of feed liquid flow status, system temperature and additional salt on K_ov were discussed, from which the mathematical model between flow status and system temperature was obtained.

Abstract: The metal oxide catalyst was prepared by loading Mn_xO_y on carbon nanotubes (CNTs) with impregnation method. Then the catalyst was characterized by BET, TEM and XPS, and the catalytic activity of the catalyst for selective catalytic reduction (SCR) of NO at low-temperature was investigated. The results showed that the species of active components loaded on the catalyst were MnO₂ and Mn₂O₃. The NO conversion was improved with reduction temperature increase under 250°C, increased slowly over 250°C. The O₂ content had an outstanding effect on NO conversion of catalysts at a low concentration range. Once the oxygen content was enhanced over 5%, there was no significant increase in the NO conversion. With the increasing of space velocity, the NO conversion rate was decreased under the reaction conditions.

Abstract: The current paper reports the results of a numerical simulation and experiment of ratcheting behavior of pressurized straight pipe under reversed bending. A nonlinear isotropic/ kinematic (combined) hardening model is implemented into finite element program ANSYS by writing own user subroutine in FORTRAN language. The results of the numerical simulation is compared with experimental data. A reasonable agreement is noticed between the experimental and the numerical results for the ratcheting behavior of the pressurized straight pipe subjected to reversed bending.

Abstract: Cu-Mn/Al₂O₃, Cu-Mn/TiO₂ and Cu-Mn/SBA-15 were prepared by incipient wetness impregnation. The activity of those catalysts for selective catalytic oxidation (SCO) of ammonia to nitrogen at low temperature (100°C~250°C) is not so satisfying. 5%Cu-5%Zr/TiO₂ has the highest NH₃ conversion and highest NO, NO₂ yield. 5%Cu-5%Mn/Al₂O₃ is a promising NH₃ selective catalytic oxidation catalyst, but still needs further study. SBA-15 is a bad support for Cu-Mn. Al₂O₃-based catalysts and TiO₂-based catalysts were also prepared by incipient wetness impregnation to sure the synergistic effect between transition metal. The results find the activity on Cu-Mn/Al₂O₃ is better than Cu-Mn/TiO₂, but NH₃ conversion on Cu-Zr/TiO₂ is rather well with high yield of NO. The role of supports and transition metals play in catalyst are discussed by a series of experiments. Key ward: SCO, NH₃, transition metal, γ-Al₂O₃, TiO₂, SBA-15

Abstract: In this paper we have retrieved the nonlinear-index coefficient based on the self-phase modulation which is resulted from a high-power laser pulses propagating in a third-order nonlinear optical material. Using the finite-difference time-domain method, the spectrum analyses have been performed with the optical pulses with different peak-powers propagating through the nonlinear optical materials with different lengths. The nonlinear-index coefficients were obtained by using the numbers of the spectrum peaks, and how to improve the accuracy has been discussed.

Abstract: For bridge structures using the traditional steel material, some problems are hard to solve, such as corrosion of steel bar and fatigue of steel deck. And the self-weight stress of the traditional high-strength steel as the material of cable stayed and suspension bridges will limit the main span and load-carrying. As a new type of high performance structural material, fiber reinforced plastic (FRP) has many advantages, such as small mass density, high tensile strength, excellent corrosion and fatigue resistant ability. Therefor in recent years, it has attracted much attention by the construction industry. In this paper, characteristics of FRP material are introduced and then applications of FRP material in bridge structures are discussed.

Abstract: Frame is one important part of all terrain vehicle, its dynamic Characteristic would influence the reliability and comfort of vehicle. All terrain vehicle frames Dynamic mode is analyzed and the modal parameters of the frame and mode of vibration was obtained and the inherent vibration mode and vibration frequency of the frame is ensured by Hypermesh-Ansys method to avoid the frame and engine resonance occurs and optimize stress condition while designing all terrain vehicle structure.

Abstract: The garage body is designed with steel structure, the mechanical part comprises a frame, a transmission track vehicle guide system, the external tooth slewing ring and elevator The control unit using PLC, sensor and the host computer, control the whole process of vehicle access.

Abstract: The more efficient use of by-product gas has always been a hot issue in the iron and steel making process. The gas generated during production process is stochastic and hardly predicted accurately. Specifically, how to regulate the supply of by-product gas from gas holder to power plant in the scheduling period to maximize the total profit of gas reutilization is present work. In response to this objective, online algorithm will be applied here to analyses the optimal strategy, which manages the by-product gas supply scheduling in term of online strategy and competitive analysis. We give the competitive ratio’s lower bound of the problem, and analyze the properties of algorithms, then give the QEW-algorithm with a competitive ratio equals to γ/(γ-β). The results of the study have guiding significance and reference value to decision makers facing the actual production process.

Abstract: Surface flexible rolling method, using two integral working rolls as the forming tool, can achieve fast, flexible and continuous manufacturing of three-dimensional sheet metal parts. This paper introduces the basic principle of surface flexible rolling and discusses the numerical simulation results when the working rolls are bended as circular arcs. The stability indicates the forming effect to some extent and the flow type of the metal can be deduced from stability analysis. To integrate and analyze the simulation results by means of reverse engineering. The analysis results show that the forming process is stable and the effect of surface flexible rolling is fine. It also indicates that inhomogeneous deformation and accumulation occurs during the process. The numerical simulation and experimental results demonstrate that the surface flexible rolling is a feasible and effective way to form three-dimensional sheet metal parts.