54 research outputs found
The nature of slow dynamics in a minimal model of frustration-limited domains
We present simulation results for the dynamics of a schematic model based on
the frustration-limited domain picture of glass-forming liquids. These results
are compared with approximate theoretical predictions analogous to those
commonly used for supercooled liquid dynamics. Although model relaxation times
increase by several orders of magnitude in a non-Arrhenius manner as a
microphase separation transition is approached, the slow relaxation is in many
ways dissimilar to that of a liquid. In particular, structural relaxation is
nearly exponential in time at each wave vector, indicating that the mode
coupling effects dominating liquid relaxation are comparatively weak within
this model. Relaxation properties of the model are instead well reproduced by
the simplest dynamical extension of a static Hartree approximation. This
approach is qualitatively accurate even for temperatures at which the mode
coupling approximation predicts loss of ergodicity. These results suggest that
the thermodynamically disordered phase of such a minimal model poorly
caricatures the slow dynamics of a liquid near its glass transition
Overview of recent physics results from the National Spherical Torus Experiment (NSTX)
CHEMICAL ENGINEERING DIVISION REACTOR SAFETY AND PHYSICAL PROPERTY STUDIES SEMIANNUAL REPORT, JANUARY--JUNE 1972.
Adsorption and degradation of chlorsulfuron and metsulfuron-methyl in soils from different depths
Degradation chimique ou microbiologique des sulfonylurees dans le sol. II. Cas du metsulfuron methyle
Shifts in archaeal communities associated with lithological and geochemical variations in subsurface Cretaceous rock
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