咖啡天牛的生存对策、 防治策略及其应用

通过分析咖啡旋皮天牛 Acalolepta cervinus (Hope)和咖啡灭字虎天牛 Xylotrechus quadripes Chevr.的生态对策、种间竞争策略,并结合有害生物综合管理(IPM)理论、咖啡林生态系统的特性、咖啡天牛的发生特点,提出了咖啡天牛的防治策略。

一种基于模型融合的CMM实施过程建模方法

提出了一种基于模型融合的CMM实施过程建模方法.该方法使用软件过程工程元模型SPEM建立CMM过程模型CPM和企业过程模型EPM,通过融合CPM和EPM来获得CMM实施过程模型C IPM.文中利用带标记的有向图描述过程模型,给出了模型融合方法,并进行了一致性证明.最后通过一个过程模型融合原型工具和实例说明了方法的应用情况.

Cross sections for transfer ionization in ion-helium collisions

A simple model has been developed within the independent-particle model (IPM) based on the Bohr-Lindhard model and classical statistical model. Cross sections for transfer ionization of helium by ions A(q+) (q = 1-3) are calculated for impact energies between 10 and 6000 keV/u. The calculated cross sections are in good agreement with the experimental data of helium by He(1-2)+ and Li(1-3)+.