Advanced Materials Research Vols. 156-157

Abstract: Biohydrogen production technology by fermentation uses biomass as raw materials to produce the renewable hydrogen energy. H2-producing bacteria(HPB) plays an important part in Biohydrogen production technology by fermentation。In this paper study on growth and Hydrogen production characteristics of HPB B49.Research has shown:⑴.Glucose concentration 10 g/L was the fittest substrate concentration of HPB B49 growth and hydrogen production;⑵Enzyme system growth of hydrogen-producing bacterium B49 at different growth phases influences hydrogen production;.⑶35 was the fittest temperature for cell growth and hydrogen production;⑷The fittest growth pH for hydrogen producing bacterium B49 was 4.5, while that for cell hydrogen production was 4.0;(5). This bacterium strain could be used as engineering bacterium in the different substrate hydrogen-producing experiments.

Abstract: Long span suspension bridges are subjected to daily, seasonal and yearly environmental thermal effects induced by solar radiation and ambient air temperature. The temperature loading effects of bridge towers of a long span cable suspension bridge are investigated based on field measurement data from temperature sensors and Global Positioning Systems. The recorded statistical data regarding the ambient/bridge temperature and the tower displacement responses are pre-processed in order to remove unreasonable and undesirable data and ensure the quality of analysis. The statistics of effective bridge temperature undergone by Tsing Ma Bridge are obtained for different time intervals. The mean displacement responses of the bridge towers in three directions are also analyzed to obtain their statistics. The observations demonstrate that the longitudinal thermal displacement of bridge towers is quite larger than those in lateral and vertical directions. The probability properties of thermal displacement of bridge towers are different to those of the commonly accepted Gauss distribution.

Abstract: The evaluation on time-varying temperature distribution of composite deck plates of long span bridge is carried out in this study through an integration of knowledge in material science and structural analysis. Two-dimensional heat transfer models are utilized to determine the time-dependent temperature distribution of deck plate, deck trough and deck pavement of the bridge. The solar radiation model is utilized to examine the time-varying temperature distribution. Comparison between the analytical results and the field measurement shows similar properties, in terms of temperature distribution within the deck segment. The made observations demonstrate that the simulated temperature variation of the deck plate based on the solar radiation model agrees well with measurement results.

Abstract: Crumb rubbers have been investigated as additives to concrete and promising results have been observed. Organosulfur compounds from a petroleum-refining factory were used to modify the surface properties of crumb rubbers. The intermolecular interaction forces between cement hydration products (C-S-H) and rubber crumbs were measured directly by an atomic force microscope (AFM) equipped with a colloid probe. Experimental data indicate that crumb rubber surface is more hydrophilic after the treatment with organosulfur compounds and the intermolecular interaction forces between C-S-H and rubber increase with the treatment of crumb rubbers with organosulfur compounds. Furthermore, these increased interaction forces lead to an increased concrete strength.

Abstract: With ADAMS dynamics software to simulate the stone movement in the vertical shaft impact crusher rotor, the law of an impact frequency and load on the throwing ends with the variation of feed size and rotor speed is studied, the reasons that the middle throwing end is most vulnerable to wear failure and the rotor speed is not as high as possible are explained.

Abstract: The advantages of applying Internet in E-manufacturing are lower cost, enhancing distances in remote monitoring and control, but it may have time delay problem and it could decrease system performance and stability. In order to keep network control system more stable and effective, a human-centered automation approach was proposed in the network control system. Experiments were designed to identify significant factors of these network control systems, and the task was to command a mobile robot to complete the maze exploration with five kinds of human-centered network control systems. Total elapsed time and subjective evaluation are performance indexes and defined as dependent variables. Furthermore, personal hobby and level of automation for the network control system are independent variables. According to ANOVA results, level of automation indeed has a significant impact on the network control performance. The manual control obtained highest performance in total elapsed time of completing the task. It also showed that it is feasible to apply human centered automation in E-manufacturing.

Abstract: Magnesium reduction Jar can be critical, consumable parts in magnesium reduction process, this paper Introduced the working environment and the common failure modes of magnesium reduction can, based on the failure can cause magnesium reduction, presents a The new structure, developed a new material, and magnesium can restore the original structure was modified, the use of new casting technology to produce a good magnesium reduction tank.

Abstract: Slewing bearing is widely used in engineering machinery, wind power generation, rotating restaurant and so on. Therefore, it is essentail to a study of monitoring and daiagnosis technique for slewing bearing. In this article, slewing bearing monitoring and diagnosis technique based on the singal of vibration, temperature, friction torque, acoustic emission, stress wave are introduced, including the methods of singal processing, especially Hilbert-Huang Transform (HHT), Ensemble Empirical Mode Decomposition–Based Multiscale Principal Component Analysis (EEMD-MSPCA) for local fault singal processing are detailed described. At last, various methods are compared.

Abstract: We have systemically investigated mössbauer spectrum of R3Fe29-xCrx (R=Y, Gd, Tb, Dy) compound. Isomer shift、Quadrupole split and Hyperfine field at room temperature are studied. We know that the electronics transfer occurs between R and Fe atoms in the R3Fe29-xCrx compound.

Abstract: The objective of this paper aims at investigating the feasibility of new coil winders with a spatial RSPC mechanism by conducting kinematic simulation. First, the design requirements and design constraints are specified based on the kinematics characteristic of coil winders. Then, the (4, 4) kinematic chains are obtained by number synthesis, and the atlas of feasible chains is generated. After that, the atlas of specialized feasible chains is found. Finally, new designs are obtained through the particularization process. In addition, an illustrated example of the RSPC mechanismselected from the new designs is given, and its feasibility is verified by performing kinematic simulation using ADAMS software. The result shows that it can meet the motion requirement of coil winders.