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VU VAN KHUONG 《高校应用数学学报(英文版)》2009,24(1)
The aim of this paper is to show that the following difference equation:xn+1=α+(xn-k/xn-m)p,n=0,1,2…,where α>-1,p>0,k,m ∈ N are fixed, 0≤m<k,x-k,x-k+1,…,x-m,…,x-1,x0 are positive, has positive nonoscillatory solutions which converge to the positive equilibrium x=α+1.It is interesting that the method described in the paper, in some cases can also be applied when the parameter α is variable. 相似文献
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The ground state of 6Li is investigated by means of the projected variational method for double well-cluster shell model. The results of the variational calculation show that the root-mean-square radius of d-cluster in the ground state of 6Li is smaller than that of free deuteron and as the mean distance between the α-cluster and the d-cluster decreases there are two effects on the d-cluster, namely contraction effect in which the d-cluster contracts first and then makes a bit extension and deformation effect in which the d-cluster makes oblation first and then streteches.It is also demonstrated by the calculation that the repulsive component of the odd sytate of N-N force and the pauli exchange of the nucleons between the clusters play an important role not only on the cluster structure in the ground state of 6Li but also on the contraction and the deformation of d-cluster in 6Li. 相似文献
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This paper presents necessary and sufficient conditions forcontrollability of linear discrete-time and continuous-timesystems with constrained controls in Banach spaces. The proofsof the main results are based on extenosions of the Banach theoremof categories and the surjectivity theorem for convex set-valuedfunctions. 相似文献
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