<正>分析了在交错网恪的情况下的高分辨差分格式，由于这类差分格式不需要解Riemann问题，因此可用干求解弱双曲守恒律方程组初值问题。其具有计算简单、工作量少、编程简便等特点。利用大规模并行机，在MPI的环境下对求解Euler方程和浅水方程的高分辨差分格式进行了并行实现，其并行效果较好。

This paper presents an unreported overall study about using bulb scale as the initial explant and MS as the basic medium with different hormones in different concentration levels to induce Lilium bulbiferum cv. ’Marco polo’ differentiating little bulbs so as to to find the best technical line to realize lilly factory production. The result reveals that "Marco polo" differentiates into bulbous projections and forms shoots directly from explants. Using interior whole scale of a bulb as the explant with the scale back lying on the medium is the best material to induce "Marco polo" to differentiate little bulbs, and with that on the medium of MS+ 6 -BA (1.0mg/L)+IBA (0.3mg/L), the average inducing coefficient can reach 2. 52. The best reproduction medium for "Marco polo" is MS+6 -BA (0.3mg/L)+IBA (0.3mg/L), on which reproducing coefficient can reach 2.60.1/2MS + 6 - BA (0.3mg/L) + IBA (0.7mg/L) is the best medium for "Marco polo" to root, and its rooting rate can be 100%. The material for transplanting is the combination of river mud and pearly rock (cubic comparison is 7: 3). The survival rate of Lilium shoots can reach 98%.