异养硝化菌株W1的分离和表征(英文)

In a high concentration substrate medium, a heterotrophic bacterium with high removal efficiency of ammonium, named W1, was isolated from activated sludge of coking wastewater treatment facility. The bacterium was Gram-negative, rod-shaped, and identified preliminarily as Alcaligenes sp. according to its morphological and physiological properties and its 16S rRNA gene sequence analysis. In the high concentration ammonium medium (400 mg·L 1 4 NH -N), the effects of C source, N source, C/N ratio and initial pH of medium on ammonium removal were investigated in order to determine the optimal condition for strain W1. The maximum ammonium removal was around 95% in 4 days in an improved medium. The production of N 2 gas was examined in a closed system that was full of pure oxygen at the beginning. N 2 gas was detected in the system after 4 days of cultivation, which further testified that strain W1 has heterotrophic nitrification and aerobic denitrification abilities simultaneously.     

基于大型注射模运动仿真提升解算速度的方法

利用UG建立大型注射模数据模型,在建立运动仿真时常遇到解算时间长的问题,分析运动仿真中连杆与运动副、连接器的联系,得出结论:影响解算速度的是仿真中建立的3D接触数量及其中连杆的小平面数量。通过减少3D接触中连杆小平面数量或直接减少3D接触的数量,建立最优的运动仿真模型,以提升运动仿真模型的解算速度,达到提升工作效率的目的。