Advanced Materials Research Vols. 479-481

Abstract: A new chrome free tanning system of rare earth (RE)-THPS has been developed in this study. It has been proved by UV spectrum that THPS and RE (CeCl₃) can coordinate under certain conditions. The influence of CeCl₃ and THPS’s ratio, pH and ligands on the shrinkage temperature (T_s) was studied. Higher Ts was obtained while the tannage was processed in the sequence of THPS followed by CeCl₃. The alkaline pH should be controlled between 5.5 and 6.0 to give ideal tanning effect. It was also found that employing of 0.5% tartaric acid in this combination tanning system can give high Ts of 89°C.

Abstract: Micro-gripper is a key module in IC/LED wire bonding. The paper presents a micro-gripper combining with piezoelectric material and flexible structure. The dynamic and static characteristics of the micro-gripper are calculated by finite element method, and the natural frequencies, the vibration modes, as well as the deflection range of the micro-gripper are obtained. In the experiment, the high-speed camera was used to track the vibration of the micro-gripper, and the relationship between deflection range and driven voltage was established. The vibration behavior was measured by a non-contact laser measuring device. These results can help improve the reliability of the micro-gripper used in wire bonding.

Abstract: A flow-coupled flywheel hybrid vehicle was proposed which has simpler configuration, fewer components and easier control method. And it was confirmed that this system had enough capability to recover vehicle kinetic energy that might otherwise be lost as heat during braking. Then, more attentions were paid to initial speed of recovery flywheel and displacement ratio of variable displacement pump/motor that influenced recovery efficiency of the proposed hybrid vehicle. It is also significant to point out that in order to improve recovery efficiency, the displacement size of variable displacement pump/motor is required so as to make it operates as maximum displacement, and the initial speed of the recovery flywheel is limited at a suitable scope (about 1000rpm~3000rpm) with regard to the windage and axial loss and the amount of energy storage. Hence, it is indicated that this type of hybrid vehicle can be as an optional configuration to widely use in hybrid vehicle.

Abstract: In this paper, several principles of popular routing algorithms and models of Auto-Guided-Vehicles are presented. Tests were conducted and performance conclusions are given. In general hybrid methods are recommended in research and application.

Abstract: In this paper，soil parameters and the collected data were tested and processed, and the changing trends of force with drilling depth were obtained and the maximum force applying to the working components was picked up. Compared with the smooth working component, the force applying to the unsmooth working components is smaller. Some parameters needed in Drucker-Prager soil model were measured and modified according to the basic tests. The simulation model was built in the finite element software -ANSYS. The simulation result is consistent with the actual testing result, which confirms the finite element model is correct .

Abstract: This paper mainly focuses on the numerical simulation of temperature field in the cyclone separation. The authors took advantage of RSM turbulence model of software FLUENT to imitate the temperature field. This thesis puts forward the temperature distribution of the cyclone, and figures out that the overall temperature is 373°C. Temperature difference in different region is less than one centigrade degree with the maximum temperature in the cone part and the minimum temperature in inlet tube and cylinder part of the cyclone, what’s more, the temperature is relatively higher near the wall. The air compression can lead the higher temperature in the lower part, so the cone part has the highest temperature. The higher temperature near the wall is caused by the friction between the wall and flow.

Abstract: In recent years, Gyro stabilized and tracking platform has been widely used in the guidance, airborne, ship-borne, the military area and civil area such as the weapon, missile seeker, sensing detection, public security fire control, environmental monitoring. In order to improve line of sight stabilization precision of the Infrared Guidance equipment to ensure the stability of the seeker pinpoint the maneuvering target, we do some researches about the essential technologies in the stability and precision of gyro. This paper developed a set of new stable platform used of three MEMS gyro devices based on the seeker of infrared detection system, in view of the zero shift stability for MEMS gyro, with the key technologies which are Kalman filtering and data fusion processing of theoretical research and experiment on the gyro signal.

Abstract: The Ti_1.4V_0.6Ni ribbon alloy containing icosahedral quasicrystal is prepared by melt-spinning technique, and the Ti_40.33Zr_40.33Ni_18.34 icosahedral quasicrystal powders are prepared by mechanical alloying. Both samples are annealing in a vacuum furnace. DSC trace obtained during continuous heating to 1300°C show a distinctly broad exothermic peak between 100°C and 1000°C for the Ti_1.4V_0.6Ni alloy, two sharp exothermic peaks between 100°C and 700°C for the Ti_40.33Zr_40.33Ni_18.34, respectively. The magnetic behavior results demonstrated the Ti_1.4V_0.6Ni ribbon alloy exhibited higher ferromagnetic properties than those of Ti_40.33Zr_40.33Ni_18.34 powders both at 15 K and 300 K. The specific heat capacity of two the sample increase when the temperature increase from 400 to 650°C.

Abstract: WEDM wire-cutting processing is a special machining method using pulse discharge happenns between electrodes and workpieces. This paper have analyzed and compared the two working modes of high-speed wire-EDM machine and low-speed wire-EDM machine. For the holes or slots distributed in mould device should be machined by WEDM method and could meet technical regulation. If all the holes or slots with higher accuracy requirement are machined in one process, the form accuracy and positional accuracy mighty be achieved. The paper compared two machining methods for the special holes with experiment. The result indicates that the improved process can greatly improve the machining accuracy and this method can be used in WEDM-HS and WEDM-LS process.

Abstract: Auto-thermal reforming (ATR) of bio-ethanol is a promising process for hydrogen production, which can lead to the possibility of directly using low concentration ethanol from fermentation plants without going through the energy-consuming distillation and dehydration processes, saving both energy and cost. Ni-based and Co-based catalysts are active for hydrogen production in ATR, where the hydrogen yield and stability are important factors to be considered. To address the concerns of selectivity and deactivation, iron was introduced into Ni-based and Co-based catalysts via wet-impregnation. The catalysts were characterized with TPR, XRD and XPS, and tested in ATR of ethanol. All the results show that iron can play an important positive role in both nickel-based and Co-based catalysts for auto-thermal reforming because of its enhancement of catalytic activity, hydrogen selectivity, as well as durability.