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  • PACS. 21.60.Ev Collective models – 21.60.Jz Hartree-Fock and random-phase approximations – 21.10.Re Collective levels and giant resonances – 21.10.Ky Static electromagnetic moments  (1)
  • biventricular pacing  (1)
  • 2000-2004  (2)
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  • 2000-2004  (2)
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  • 1
    ISSN: 1434-601X
    Keywords: PACS. 21.60.Ev Collective models – 21.60.Jz Hartree-Fock and random-phase approximations – 21.10.Re Collective levels and giant resonances – 21.10.Ky Static electromagnetic moments
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The isospin dependence of shell closure phenomena is studied for light neutron-rich nuclei within a microscopic self-consistent approach using the Gogny force. Introducing configuration mixing, 32Mg is found to be dynamically deformed, although the N = 20 spherical shell closure persists at the mean-field level for all N = 20 isotones. In contrast, the N = 28 spherical shell closure is found to disappear for N - Z≥ 10 whereas deformed shell closures are preserved and lead to shape coexistence in 44 S. Configuration mixing shows that the ground state of this nucleus is triaxially deformed. The first 2+ excitation energy Ex = 1.46 MeV and the reduced transition probability B(E2;0+ gs→ 2+ 1)= 420 e 2 fm 4 obtained with our approach are in good agreement with experimental data.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1572-8595
    Keywords: biatrial pacing ; biventricular pacing ; pacemaker indication ; coronary sinus electrodes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The artificial activation of the heart modifies the mechanics of contraction and relaxation. While only little basic research has been addressed to this question, clinical observations showed that for hypertrophic as well as dilated cardiomyopathies appropriate pacing techniques can be useful. Pacing can influence the activation sequence. The spread out from a single site is slow, and so hypercontractility deminshed. With the use of multiple electrodes, two atrial and/or two ventricular, conduction delays in the atria or ventricles can be eliminated. Synchronisation of the cardiac activation has an anti-arrhythmic and positiv inotropic effect. This may lead to new indications for pacemakers or better to be named cardiac synchronisers.
    Type of Medium: Electronic Resource
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