19,822 research outputs found
Cooperative heterogeneous facilitation: multiple glassy states and glass-glass transition
The formal structure of glass singularities in the mode-coupling theory (MCT)
of supercooled liquids dynamics is closely related to that appearing in the
analysis of heterogeneous bootstrap percolation on Bethe lattices, random
graphs and complex networks. Starting from this observation one can build up
microscopic on lattice realizations of schematic MCT based on cooperative
facilitated spin mixtures. I discuss a microscopic implementation of the F13
schematic model including multiple glassy states and the glass-glass
transition. Results suggest that our approach is flexible enough to bridge
alternative theoretical descriptions of glassy matter based on the notions of
quenched disorder and dynamic facilitation.Comment: 4 pages, 2 figure
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Software tools for stochastic programming: A Stochastic Programming Integrated Environment (SPInE)
SP models combine the paradigm of dynamic linear programming with
modelling of random parameters, providing optimal decisions which hedge
against future uncertainties. Advances in hardware as well as software
techniques and solution methods have made SP a viable optimisation tool.
We identify a growing need for modelling systems which support the creation
and investigation of SP problems. Our SPInE system integrates a number of
components which include a flexible modelling tool (based on stochastic
extensions of the algebraic modelling languages AMPL and MPL), stochastic
solvers, as well as special purpose scenario generators and database tools.
We introduce an asset/liability management model and illustrate how SPInE
can be used to create and process this model as a multistage SP application
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