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Pulsating flow of a plastic fluid (1982)

Phan-Thien, N. ; Dudek, J.

[s.l.] : Nature Publishing Group

Nature 296 (1982), S. 843-844

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ISSN: 1476-4687

Source: Nature Archives 1869 - 2009

Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics

Notes: [Auszug] This fluid does not deform below a certain yield shear stress Ty; above this yield shear stress it flows like a newtonian fluid (with constant viscosity) and is thus not shear-thinning in the normal sense. However, a power analysis shows that the extra power required to pulsate the flow is greater ...

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1038/296843a0

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Systematically too low values of the cranking model collective inertia parameters (1980)

Dudek, J. ; Dudek, W. ; Ruchowska, E. ; [et al.]

Springer

The European physical journal 294 (1980), S. 341-350

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ISSN: 1434-601X

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract Deformed Nilsson and Woods-Saxon potentials were employed for generating single particle states used henceforth for calculating the inertia tensor (cranking model and monopole pairing) and the collective energy surfaces (Strutinsky method). The deformation was parametrized in terms of quadrupole and hexadecapole degrees of freedom. The classical energy expression obtained from the inertia tensor and energy surfaces was quantized and the resulting stationary Schrödinger equation was solved using the approximate method. The secondI π=0 2 + collective level energies were calculated for the Rare Earth and Actinide nuclei and the results compared with the experimental data. The vibrational level energies agree with the experimental ones much better for spherical nuclei for both single particle potentials; the discrepancies for deformed nuclei overestimate the experimental results by roughly a factor of two. It is argued that coupling of the axially symmetric quadrupole degrees of freedom to non-axial and hexadecapole ones does not affect the conclusions about systematically too low mass parameter values. The alternative explanation of the systematic deviations from the 0 2 + level energies could be a systematically too high stiffness of the energy surfaces obtained with the Strutinsky method.