离散事件动态系统理论在通信网络中的应用

通信网络是—个典型的离散事件系统。离散事件动态系统（ＤＥＤＳ）理论综合并提出了许多对离散事件系统建模及性能评估等的方法,为解决通信网络中的一些关键问题提供了有力的工具。本文综述了近年来ＤＥＤＳ理论在通信网络建模、分析、优化以及网络管理等方面的应用进展情况,并提出了一些自己的看法。     

添加Dy、Al对机械合金化NdFeB永磁体的作用

研究添加Dy、Al对NdFeB永磁体结构和磁性能的影响,利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)和振动样品磁强计(VSM)研究样品不同球磨时间的显微结构及其磁性能.结果表明,在一定条件下Dy取代部分Nd可以细化晶粒,改善了合金的显微组织,提高合金的内禀矫顽力.     

中国南方红壤地区粮食作物气候生产潜力研究——以江西省为例

该文在前人全省农业分区的基础上，从计算每年进入各农业区土地生态系统的太阳幅射能开始，逐步计算出各农业区土地生态系统粮食作物生产的光合潜力、光温潜力和气候潜力，进而得到全省粮食作物的气候生产潜力总量．在分析江西省粮食作物生产现状的基础上，提出了发挥江西省粮食作物生产潜力的措施．     

pH effect of· OH radical induced oxidation of phosphoryl- methionine in aqueous solution

Conclusion The results of pulse radiolytical research on the · OH radical-induced oxidation of NDM in aqueous solution demonstrate that pH value has a great influence on the radiolytical mechanism of NDM. At low pH value, the product is mainly stabilization of the oxidizing sulfur centre in the three-electron-bonded cation radical NDM₂ ·⁺ [S]; with the increase of pH value, NDM₂ ·⁺ [S] gradually decays to become the reducing α-amino radical which was verified by the chemical method and whose yield was also calculated. Compared with Met₂ ·⁺ [S] produced by the · OH radical-induced oxidation in aqueous solution [1], the stability of NDM₂·⁺ [S] increases and the yield of α-amino radical decreases. This suggests that the introduction of phosphoryl group has a coordinating effect on the radioprotection of methionine to biological systems, and provides the essentially theoretical foundation for the thorough clarification of the reversible phosphorylation of proteins.     

浅议住宅小区地下车库的权利归属

处理业主投诉是物业管理工作中关系到服务质量的重要环节,文章从业主投诉问题的来源和成因进行分析和研究,探讨处理业主投诉问题的方法和途径,寻找系统解决业主投诉问题的科学方案.     

周向平均形式的S_2流面计算

本文按照周向平均的方法,应用古川、井上给出的周向平均形式的平衡条件式,对翼形斜流叶轮考虑非轴对称时的S_2流面进行了计算,并将它与轴对称时的计算结果作了比较。     

Orogen-parallel extension in Himalays:Is it the indicator of collapse or the product in process of compressive uplift?

Extensional structures developed extensively in Himalaya with their strikes perpendicular to that of the orogenic belt. The studies of such structures in Qusum, Burang, Lhozhag, Nyalam and Yadong show that they represent an orogen-parallel extension. The basins produced by the extension experienced orogen-perpendicular compression during their formation. The ages of the extension rang from 16 to 13 Ma and coincide with the intensive compressive stage in Southeastern Asia. Therefore, the extension is syn-shortening and the dominate tectonic movement in Himalaya was compression and uplift during the extension. The extension was the partition of compressive deformation rather than the indicator for the collapse and falling of the Tibetan Plateau.     

ProEngineer与Ansys在结构设计中的应用

CAE在机械各行业应用已越来越受到重视，尤其是在结构设计等领域。介绍利用ProEngineer建立有限元模型并通过Ansys求解及后处理的具体方法。