10,648 research outputs found
Energy and Atomic Mass Dependence of Nuclear Stopping Power in Relativistic Heavy-Ion Collisions in Interacting Gluon Model
We present a Monte-Carlo simulation of energy deposition process in
relativistic heavy-ion collisions based on a new realization of the
Interacting-Gluon-Model (IGM) for high energy collisions. In particular
we show results for proton spectra from collisions of
S beam incident on S target and analyze the energy and mass
dependence of nuclear stopping power predicted by our model. Theoretical
predictions for proton rapidity distributions of both Pb + Pb
collisions at CERN SPS and Au + Au at
BNL RHIC are given.Comment: 10 pages in compressed uuencoded fil
Multi-boson effects and the normalization of the two-pion correlation function
The two-pion correlation function can be defined as a ratio of either the
measured momentum distributions or the normalized momentum space probabilities.
We show that the first alternative avoids certain ambiguities since then the
normalization of the two-pion correlator contains important information on the
multiplicity distribution of the event ensemble which is lost in the second
alternative. We illustrate this explicitly for specific classes of event
ensembles.Comment: 6 pages, three figures,submit to PR
Parameter optimization and active vibration suppression control in gyroscopic system
A new method for suppressing vibration in a rotating beam system of a helicopter is presented. The method uses a non-linear dynamics equation to compute actual natural frequencies using FFT, not based on nominal natural frequencies of linear dynamics. A design based on linear coupling may not take account of the effect of non-linear coupling in the system, so a conceptual controller design is also presented, and a detailed control algorithm is developed. In fact, this is a non-linear dynamics optimization problem.In a gyroscopic system, tuning of the flywheel allows a commensurable relationship to be established between the natural frequencies of the system, resulting in a strong coupling between the vibrating modes. Having established a strong coupling within the system, damping is introduced in the flywheel via an actuator, resulting in rapid vibration suppression. Numerical simulation demonstrates the efficiency of the modification
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