Advanced Materials Research Vols. 482-484

Abstract: The flow field of lubrication film under the bottom of the slipper was analyzed particularly. Taking into account of the rotation and self-rotation of the slipper, got the velocity of lubrication film under the bottom. By machining some regular concaves convergenting along radial in slipper’s bottom face，to enhance lubrication effect ,and improve the wear and tear situation in the outer fringe.

Abstract: According to the low speed and high torque characteristics of tractor, the paper discussed the application feasibility of the lock pin synchronizer in tractor, and analyzed its running principle and working process. The 3D model of synchronizer is established based on Pro/e software. The dynamic simulation of the synchronizer’s working process is made by the multi-body dynamics analysis software ADAMS. The dynamic simulation curves reflected synchronizer properties such as angular velocity, friction torque and the synchronization time. After being compared with the theoretical calculation value, the results show that there are only some smaller errors exist between theoretical value and simulation value, which verified the accuracy of simulation model.

Abstract: A mechanism of particles aggregation in liquid media is analyzed by applying the theory of aggregation which was developed in the field of colloid engineering. Hydrophobic particles are liable to aggregate in collision. Inclusions aggregation by using solid plastics particles in various solvent is observed in the course of floatation. Aggregation rate and size distribution of particles in turbulent dispersions has been studied. The aggregation contributed by plastic particles based on surface energy density and the droplet surface oscillation is considered. Hydrophobic particles, generally having a tendency to aggregate in water, disperse well in ethanol, particles in the mixture of water and ethanol are much better disperse than separately in water. The solvent properties, temperature and simulation particles are influence to the aggregation from the experiment that we can discover. The aggregation rate and size distribution were determined by wettabiliy.

Abstract: Bamboo, as a kind of non-wood raw material, has a long, thin fiber with wide distribution and rich abundance in China. It was studied that cooking reagents on bamboo pulping. AQ ramification and infiltration reagents were used to improve the cooking schedule. The results showed that AQ ramification could strengthen the cooking, but infiltration reagents couldn’t reach the good expect in cooking. When the AQ ramification and infiltration reagents were used together to cook, it could obviously decrease the Kappa number of the pulps and enhance the yield of pulps. Infiltration reagent Busperse 2806 was the best choice in cooking with AQ ramification. When the dosage of AQ ramification 0.05%, Infiltration reagent 0.03%, the yield of pulps increased 1.31%, kappa number decreased 4.0, and the dosage of AQ ramification 0.05%, Infiltration reagent 0.03%, the kappa number decreased 5.5, the screened yield decreased 1.54%.

Abstract: Recently, some solid state fermentation (SSF) processes of xanthan production were studied. However, quantitative analysis of the concentration of xanthan and biomass is more complicated than that of submerged fermentation. To facilitate the analysis of these components, near–infrared spectroscopy (NIRS) was used. A NIRS calibration models for rapidly estimating xanthan and biomass concentration in xanthan fermentation on inert support of polyurethane foam was established. The wavenumber and spectral pretreatment method were optimized. The data of cross validation and external validation shows that NIRS was suitable for rapid and accurate quantification of the concentration of xanthan and biomass in solid state fermentation on inert support. This method will provide much convenience for the research of solid state fermentation on inert support.

Abstract: With the in-depth development of informatization construction, various business gradually campus network integration. Our school VMware to the virtualization based on various departments to provide hosting services, but in the virtual machine application and management in the process of maintaining involved a lot of artificial operation, constitute the bottleneck management. Thus use cloud computing to design virtual comprehensive management platform, and with web services for the virtual machine as an example to introduce the function of the platform. This platform has significant meaning to improve management efficiency of virtual machine and speed up our school information construction pace.

Abstract: Rotary bending fatigue test was adopted to study the subsurface fracture property of a low alloy steel in very high cycle regime. As a result, the subsurface crack initiation and propagation with fine granular area (FGA) induced by subsurface incision is the predominant reason for fatigue facture of this low alloy steel in very high cycle regime of N>10⁶, which can be divided into three stages to discuss: (I) small crack propagation inside of FGA, (II) stable crack propagation in the fish-eye region outside of FGA and (III) final catastrophic fracture outside of fish-eye. The crack growth rate in the first stage is lower than 10^-11m/cycle, which means that the progress of FGA formation is extremely slow and consumes the great majority of total fatigue life. The interior stress intensity factor range corresponding to subsurface inclusion and the stress intensity factor ranges of FGA and fish-eye (ΔK_int-th, ΔK_FGA and ΔK_fish-eye) can be regarded as the threshold values of controlling subsurface crack propagation in these three stages, respectively.

Abstract: In the present work, mechanical properties and microstructures of hot-rolled and solution-treated Fe-26Mn-6Al-1C steel (6Al steel) were investigated. Tensile tests were carried out at room temperature. The samples were characterized by using XRD, OM, SEM and TEM. The results suggested that the microstructure of the hot rolled 6Al steel was fully austenitic. After solution treatment and deformation, the microstructure was still single austenite. With the increase of the solution treatment temperatures, the strength decreased and the elongation increased. After solution treated at 1100°C for 1h, the yield strength, ultimate tensile strength and elongation were 378MPa, 756MPa and 57%.

Abstract: Based on electromagnetic theory, a billet model electromagnetic continuous casting of physical and mathematical were established. The three-dimensional mold for billet electromagnetic field was calculated by finite element method of ANSYS three-dimensional numerical simulation. Then the distribution of the electromagnetic field inside the crystal was gotten. At the same time, the influence of the power frequency and current strength on the intensity and distribution of the magnetic field were simulated. The result shows that the maximum of the electromagnetic flux density lies in the center of induction coil (steel surface in the center of the coil), and the magnetic flux density gradually reduces along the casting direction; the magnetic flux density increases while the power frequency is increasing; the magnetic flux density increases with the increasing of the current intensity.

Abstract: The domestic and foreign research situation of the biomechanical characteristics and rheological characteristics of the biological flexible tubular organs is introduced in this paper. The research includes the biomechanical characteristics of the cardiovascular system ,the trachea，the alimentary tract and the rheological characteristics of the blood, the mucus. The biomechanical characteristics of the biological flexible tubular organs divides into two parts: the stress-strain rule is researched through the one-dimensional or two-dimensional tensile experiments of the biological flexible tubular organs；the wall residual stress strain is researched for the biological flexible tubular organs in no load conditions. The stress-strain rule has been acquired through the one-dimensional or two-dimensional tensile experiments of the cardiovascular system, the trachea, the alimentary tract. The walls of the cardiovascular system ,the trachea，the alimentary tract have residual stress strain through measuring the opening angles.