We present an extensive set of simulation results for the stress relaxation in equilibrium and step-strained bead-spring polymer melts. The data allow us to explore the chain dynamics and the shear relaxation modulus, G(t), into the plateau regime for chains with Z=40 entanglements and into the terminal relaxation regime for Z=10. Using the known (Rouse) mobility of unentangled chains and the melt entanglement length determined via the primitive path analysis of the microscopic topological state of our systems, we have performed parameter-free tests of several different tube models. We find excellent agreement for the Likhtman-McLeish theory using the double reptation approximation for constraint release, if we remove the contribution of high-frequency modes to contour length fluctuations of the primitive chain.
We determine the minimal number of qubits that are necessary to be accessed
In order to transform Dicke states into other Dicke states. In general, the
Number of qubits in Dicke states cannot be increased via transformation gates
By accessing only a single qubit, in direct contrast to other multipar...
Bitter perception has a particularly important role in host defence. However, to date, direct effects of bitter compounds on small intestinal motility have not been shown. This study investigated the effects of bitter compounds on the spontaneous contraction of longitudinal smooth mu...
We study the thermalization of excitations generated by spontaneous emission
Events for cold bosons in an optical lattice. Computing the dynamics described
By the many-body master equa- tion, we characterize equilibration timescales in
Different parameter regimes. For simple observables, we find reg...
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