No abstract available

[en] Published in summary form only

[en] A microscopic theory is presented for the orbital dynamics of ³HeA. There are some significant disagreements with purely hydrodynamic theories as well as with phenomenological approaches

[en] The overall objective of this research is to develop analysis tools for determining actuator requirements and assessing viable actuator technology for design of a flexible tail propulsor in an artificial alligator. A simple hydrodynamic model that includes both reactive and resistive forces along the tail is proposed and the calculated mean thrust agrees well with conventional estimates of drag. Using the hydrodynamic model forces as an input, studies are performed for an alligator ranging in size from 1 cm to 2 m at swimming speeds of 0.3–1.8 body lengths per second containing five antagonistic pairs of actuators distributed along the length of the tail. Several smart materials are considered for the actuation system, and preliminary analysis results indicate that the acrylic electroactive polymer and the flexible matrix composite actuators are potential artificial muscle technologies for the system

[en] Event-by-event hydrodynamics (or hydrodynamics with fluctuating initial conditions) has been developed in the past few years. Here we discuss how it may help to understand the various structures observed in two-particle correlations.

[en] Short communication. 5 refs

[en] The stage of formation of secondary particles in the hydrodynamical theory of multiparticle production is studied. It is found that the spectrum of secondary particles from the decay of an element of the fluid in the rest system of this element is in general anisotropic

[en] We calculate the hydrodynamical expansion of a hot nucleus. The results indicate that at breakup the excited nuclear system emits its surface region with a relatively high kinetic energy. We investigate the intermittency patterns found in multifragmentation data and find that they appear because of a combination of finite size effects and the mixing of fragmentation events corresponding to different initial conditions. (author). 16 refs., 5 figs

[en] The question of the role of strange attractors in MHD turbulence is treated in the case of an interchange-unstable plasma. Using truncated Fourier expansions, generalized Lorenz equations for N amplitudes are derived. Their solutions are investigated numerically up to N = 136, and compared with results from a fluid code. For the generalized Lorenz equations, strange attractors are found, which indicates that the original MHD equations also possess this type of solution

[en] The time-scales of rehadronization are considered for a baryon-free QGP at RHIC and LHC energies. The non-equilibrium nucleation scenario leads to the development of mechanical instability of the supercooled QGP phase which then may be suddenly converted in a timelike deflagration from the supercooled state to a (super)heated hadronic matter. In a model simulation such a sudden process was indeed possible and satisfied energy and momentum conservation with non-decreasing entropy. It is possible to reach a hadronic state frozen out immediately after the timelike deflagration. If a TD leads to a simultaneous hadronization and freeze-out, the conditions of a pion-flash are satisfied. This rehadronization mechanism is signalled by a reduced (if not vanishing) difference between the sidewards and outward components of Bose-Einstein correlation functions, in the observation of the free masses of the resonances in the dilepton spectra, and in a clean strangeness signal of the QGP. copyright 1995 American Institute of Physics