2,524,606 research outputs found
Maximal subgroups of direct products
We determine all maximal subgroups of the direct product \sc G^n of \sc n
copies of a group~\sc G. If \sc G is finite, we show that the number of
maximal subgroups of~\sc G^n is a quadratic function of~\sc n if \sc G is
perfect, but grows exponentially otherwise. We~deduce a theorem of Wiegold
about the growth behaviour of the number of generators of~\sc G^n.Comment: Plain TeX file, 8 page
Superdeformed hypernuclei with antisymmetrized molecular dynamics
The response to the addition of a hyperon is investigated for the
deformed states such as superdeformation in Ca, Sc and Sc. In the present study, we use the antisymmetrized
molecular dynamics (AMD) model. It is pointed out that many kinds of deformed
bands appear in Sc and Sc. Especially, it is found that there
exists superdeformed states in Sc. By the addition of a
particle to Ca, Sc and Sc, it is predicted, for the first
time, that the superdeformed states exist in the hypernuclei Ca
and Sc. The manifestation of the dependence of the
-separation energy on nuclear deformation such as spherical, normal
deformation and superdeformation is shown in the energy spectra of
Ca, Sc and Sc hypernuclei.Comment: 24 pages, 8 figure
Multi-Dimensional Spatially-Coupled Codes
Spatially-coupled (SC) codes are constructed by coupling many regular
low-density parity-check codes in a chain. The decoding chain of SC codes stops
when facing burst erasures. This problem can not be overcome by increasing
coupling number. In this paper, we introduce multi-dimensional (MD) SC codes.
Numerical results show that 2D-SC codes are more robust to the burst erasures
than 1D-SC codes. Furthermore, we consider designing MD-SC codes with smaller
rateloss
- …