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101.
102.
103.
G. Peter Lepage 《Annals of Physics》2005,315(1):193-212
Recent advances in lattice QCD have resulted in the first simulations with realistic quark vacuum polarization. Consequently a wide variety of high-precision (few percent) nonperturbative calculations are possible now. This paper reviews the recent developments that make this possible, and presents early evidence that the era of high-precision nonperturbative QCD is at hand. It also discusses the future impact of lattice QCD on experiments, and particularly for heavy-quark physics. 相似文献
104.
Vito Vitrih 《Annali dell'Universita di Ferrara》2008,54(2):349-359
In this paper, four-pencil lattices on tetrahedral partitions are studied. The explicit representation of a lattice, based
upon barycentric coordinates, enables us to extend the lattice from a single tetrahedron to a tetrahedral partition. It is
shown that the number of degrees of freedom is equal to the number of vertices of the tetrahedral partition. The proof is
based on a lattice split approach.
相似文献
105.
On social percolation and small world network 总被引:1,自引:0,他引:1
E. Ahmed H.A. Abdusalam 《The European Physical Journal B - Condensed Matter and Complex Systems》2000,16(3):569-571
The social percolation model is generalized to include the propagation of two mutually exclusive competing effects on a one-dimensional
ring and a two-dimensional square lattice. It is shown that the result depends significantly on which effect propagates first
i.e. it is a non-commutative phenomenon. Then the propagation of one effect is studied on a small network. It generalizes the
work of Moore and Newman of a disease spread to the case where the susceptibility of the population is random. Three variants
of the Domany-Kinzel model are given. One of them (delayed) does not have a chaotic region for some value of the delay weight.
Received 24 February 2000 相似文献
106.
Self-avoiding walk models of a polymer confined between two parallel attractive walls in two and three dimensions (slits and
slabs, respectively) have recently had a revival of interest. They were first studied as simple models of steric stabilisation
and sensitised flocculation in colloids. The revival has been catalysed by new exact solution techniques, that have allowed
the solution of directed walk models in two dimensions in full generality, and by new Monte Carlo techniques that have allowed
the simulation of the full parameter space in the three-dimensional slab model. Additionally, rigorous techniques applied
to the slab problem have also yielded new results. The contributions to the study of this problem that have been recently
added include a novel phase diagram for the “infinite-slab” (when the walls are a macroscopic distance apart but both walls
may still “see” the polymer) the delineation of the repulsive and attractive regimes of the parameter space, and a conjectured
scaling theory for the problem in general dimensions. 相似文献
107.
108.
Feiguo chen Wei Ge Li Guo Xianfeng He Bo Li Jinghai Li Xipeng Li Xiaowei Wang Xiaolong Yuan 《中国颗粒学报》2009,7(4)
mputing mode. The preliminary applications of this machine in areas of multi-phase flow, molecular dynamics and so on are reported, demonstrating the supercomputer as a paradigm of green computation in new architecture. 相似文献
109.
D. Meyer W. Nolting 《The European Physical Journal B - Condensed Matter and Complex Systems》2000,18(3):385-395
We compare different approximation schemes for investigating ferromagnetism in the periodic Anderson model. The use of several
approximations allows for a detailed analysis of the implications of the respective methods, and also of the mechanisms driving
the ferromagnetic transition. For the Kondo limit, our results confirm a previously proposed mechanism leading to ferromagnetic
order, namely an RKKY exchange mediated via the formation of Kondo screening clouds in the conduction band. The contrary case is found in the intermediate-valence regime.
Here, the bandshift correction ensuring a correct high-energy expansion of the self-energy is essential. Inclusion of damping
effects reduces stability of the ferromagnetic phase.
Received 5 June 2000 and Received in final form 3 August 2000 相似文献
110.
S. Jain P. Buckley 《The European Physical Journal B - Condensed Matter and Complex Systems》2006,50(1-2):133-136
Persistence is studied in a financial context by mapping the time
evolution of the values of the shares quoted on the London Financial
Times Stock Exchange 100 index (FTSE 100) onto Ising spins.
By following the time dependence
of the spins, we find evidence for power law decay of the proportion
of shares that remain either above or below their 'starting'
values. As a result, we estimate a persistence exponent for the
underlying financial market to be θf∼0.5. 相似文献