The Busse-Heikes dynamical model is described in terms of relaxational and nonre-laxational dynamics. Within this dynamical picture a diverging alternating period is calculated in a reduced dynamics given by a time-dependent Hamiltonian with decreasing energy. A mean period is calculated which results from noise stabilization of a mean energy. The consideration of spatial-dependent amplitudes l...

Computational grid computing has emerged as one of the most promising research areas in high performance and distributed computing. The ability to allocate large numbers of resources for a parallel application with a greatly reduced cost makes the concept grid computing highly appealing. The heterogeneous nature of a grid creates a complex application environment; the nature of faults within th...

Non-Markovian reduced dynamics of an open system is investigated. In the case the initial state of the reservoir is the vacuum state, an approximation is introduced which makes possible to construct a reduced dynamics which is completely positive.

California is a leader among states in its efforts to cut greenhouse gas emissions. Under the California Global Warming Solutions Act of 2006 (Assembly Bill 32), the state has set itself on a course to reduce its greenhouse gas emissions to 1990 levels by the year 2020. In addition to its cap-and-trade program, California aims to accomplish this objective via a large assortment of complementary...

A new method to deal with reduced dynamics of open systems by means of the Schrödinger equation is presented. It allows one to consider the reduced time evolution for correlated and uncorrelated initial conditions.

Software services offer many opportunities like reduced cost for IT infrastructure. They also introduce new risks, for example the clients lose control over their data. While data can be secured against external threats using standard techniques, the service providers themselves have to be trusted to ensure privacy. In this paper, we examine methods that can increase the level of privacy a serv...