昆明水源水和自来水水质致突变性及化学背景值1．Ames试验和水源水及自来水微量有机、无机污染物化学背景值

该文报道: 用XAD-2离子树脂吸附富集法制备自来水和滇池及松华坝水库源水提取物, 以 Ames 鼠伤寒沙门氏菌回复突变系统诱发致突变性. Ames 试验结果如下; 来自滇池源水经氯化的自来水提取物, 用TA_(98)菌株加S_(9)或不加S_(9)混合物, 突变率＞２, 结果为阳性. 滇池源水提取物致突变性为可疑. 使用化学分析法结合生物分析法评价昆明自来水和滇池及松华坝水库水中的化学微量污染物, 估价在水中的微量污染物对人体健康的潜在致癌效应是有意义的。

Parallel Fully-Implicit Computation of MHD Acceleration Experiments

A three-dimensional MHD solver is described in the paper. The solver simulates reacting flows with nonequilibrium between translational-rotational, vibrational and electron translational modes. The conservation equations are discretized with implicit time marching and the second-order modified Steger-Warming scheme, and the resulted linear system is solved iteratively with Newton-Krylov-Schwarz method that is implemented by PETSc package. The results of convergence tests are plotted, which show good scalability and convergence around twice faster when compared with the DPLR method. Then five test runs are conducted simulating the experiments done at the NASA Ames MHD channel, and the calculated pressures, temperatures, electrical conductivity, back EMF, load factors and flow accelerations are shown to agree with the experimental data. Our computation shows that the electrical conductivity distribution is not uniform in the powered section of the MHD channel, and that it is important to include Joule heating in order to calculate the correct conductivity and the MHD acceleration.