关于Lee猜想

Lee提出如下猜想:对任意整数n＞1和S(n)中置换f,P(Pn,f)是优美的.采用组合方法对4类置换证明此猜想的正确性.当f=(1,2,…,n),(n,n-1,…,2,1),(m,m 1,m 2,m 3),(m,m 3,m 2,m 1)时,路置换图P(Pn,f)是优美的.     

关于Lee猜想的一些结论

Lee提出了猜想:对任意正整数n>1及n次对称群S(n)中的任意置换f,路置换图P(Pn,f)都是优美的.讨论了当f=l-1Ⅱk=0(m+4k,m+4k+2)(m+4k+1,m+4k+3)(其中m和l为正整数,且m-1+41≤n)时,路置换图P(Pn,f)的优美性.     

重质石油中含氮化合物的形态及分布分析V^＋

用柱层析一步法分离富集胜利减二线油样中的酸性氮化合物，用１ｍｏｌ／Ｌ盐酸及３ｍｏｌ／Ｌ盐酸萃取碱性氮化合物，以色／质联用技术结合质谱，质量色谱，谱库检索及Ｌｅ４保留指数对照等对各氮化合物进行定性鉴定。     

Lee's extremum principle and the large deflection response of dynamically loaded plastic structures

An approximate method based on Lee's extremum principle is introduced to study the large deflections of dynamically loaded plastic structures. As an example, the evolutionary mode of an impulsively loaded rigid-perfectly plastic portal frame is determined and then compared with the experimental results [8] and with the large deflection complete solution obtained previously [9]. It is found that the evolutionary modal solution may approach the complete solution if the modes are appropriately chosen.