Papers by Author: Jie Liu

Abstract: In order to simulate dynamic and randomness of irregular objects, like rain, snow, cloud, rut in the vehicle driving simulation system, here uses a method of hierarchical structured particle system dynamic modeling. First of all, the particles are divided into several units according to their similarity relation, then using the hierarchical tree structure to describe details. Through practice, this method can guarantee simulation precision and improve the real-time performance.

Abstract: In order to further optimize the structure of tube-rod extended penetrator, the author did numerical simulation to the penetration process of five different head structures and rod assembly of tube-rod extended penetrator to finite RHA603 target with LS-DYNA at a certain speed. Be drawn from the results of the numerical simulation, the penetration effect of truncated cone head structure is the best, because its top angle is small, the wave on the top is weak, the overpressure is small, and it is faster to open a pit on the target. 3mm aluminum sleeve rod attachment structure is the best. In the early penetrating stage, it can enhance the stiffness of the the rear rod, so that it will not deform under the stress wave in front penetration. In the late penetrating stage, due to the weak aluminum sleeve, it is easy to crash in contact with the target plate, so no excessive energy of the rod is used to open the pit.

Abstract: Au/C catalyst used for the liquid phase selective oxidation of glucose to gluconate was prepared by gold sol method that includes the preparation of metallic colloid by citrate reduction and subsequent immersion by carbon support. The influence of gold particles of different size on the activity of Au/C catalyst was studied. The results show that the catalyst with good dispersed spherical gold particles has higher catalytic activity. After 16 runs, the conversion of glucose selective oxidation can still achieve over 96% under mild reaction conditions.

Abstract: Spinel LiMn2O4 was prepared by solution combustion synthesis. The effect of fuel content and calcination procedure on phase composition and microscopic structure of LiMn2O4 was studied. X-ray diffraction patterns showed that fuel content had no obvious influence on the grain size and phase purity of LiMn2O4. Higher calcination temperature led to higher phase purity, lager grain size, and better crystallization of resultant LiMn2O4. Below 600°C the effect of calcination time was inconspicuous, which became notable above 700°C. Scanning electron microscope images showed that nanocrystalline LiMn2O4 was obtained when the calcination temperature was lower than 600°C and the grain size increased at higher temperatures.