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21.
M.?-G.?PorquetEmail author S.?Péru M.?Girod 《The European Physical Journal A - Hadrons and Nuclei》2005,25(3):319-323
Self-consistent calculations using the D1S Gogny force have been performed in order to study the mechanism involved in the
crossing of the πd
5/2 and πg
7/2 orbitals in the Sb isotopes. This inversion is well predicted by the HFB + blocking calculations with spherical symmetry
performed for the odd-A Sb isotopes. In addition, several HFB and HF calculations have been performed for even-even nuclei of the five neighbouring
isotopic chains (Z = 46 to 54, from the proton dripline to N = 82). The results obtained for the binding energies of the two proton orbitals indicate that the radii of the systems play
an important role in the crossing, even though some particular πν interactions also give a contribution. The spin-orbit interaction,
which is known to be concentrated mainly at the nuclear surface, is proposed to be the main responsible of the crossing. 相似文献
22.
Severyukhin A. P. Voronov V. V. Van Giai Nguyen 《The European Physical Journal A - Hadrons and Nuclei》2004,22(3):397-403
Starting from an effective Skyrme interaction we present a method to take into account the coupling between one- and two-phonon terms in the wave functions of excited states. The approach is a development of a finite rank separable approximation for the quasiparticle RPA calculations proposed in our previous work. The influence of the phonon-phonon coupling on energies and transition probabilities for the low-lying quadrupole and octupole states in the neutron-rich Sn isotopes is studied. 相似文献
23.
In this paper we study the rotational form of the pressure-correction method that was proposed by Timmermans, Minev, and Van De Vosse. We show that the rotational form of the algorithm provides better accuracy in terms of the -norm of the velocity and of the -norm of the pressure than the standard form.
24.
We demonstrate that an idea related to the Central Limit Theorem and approximations by accompanying laws in probability theory is useful to get optimal convergence rates in some approximation formulas for operators. As examples we provide a bound for Euler approximations of bounded holomorphic semigroups; a bound for error in approximation of a power of operators by accompanying exponents, which is a useful tool in analysis of the Trotter–Kato formula, and can be considered as an extended version of Chernoff's
lemma. 相似文献
25.
For a strictly decreasing sequence an
n=0 of nonnegative real numbers converging to zero, we construct a continuous 2-periodic function f such that RT
n(f) = an, n=0,1,2,..., where RT
n(f) are best approximations of the function f in uniform norm by trigonometric rational functions of degree at most n. 相似文献
26.
The problem of obtaining inner approximations to the set
of null controllability for linear systems is considered, and the geometry of certain sets arising in the approximation of
using linear feedback is explored. A two-dimensional example is worked in detail in order to delineate the limitations to the use of linear feedback. 相似文献
27.
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30.
A second-order fluid flow model of a queue with finite capacity buffer and variable net input process is presented, based
on the previous work of Karandikar and Kulkarni (1995). Queue length is modelled as a Brownian motion whose parameters are
controlled by a finite state Markov chain. The process, termed a Markov modulated regulated Brownian motion (MMRBM), provides
analytical solutions for steady state queue length distributions, overflow losses and idleness probabilities using boundary
regulators. Applications of the model include queues with failure-prone servers and ATM statistical multiplexers with variable
traffic loads.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献