A Transport Equation for Quantum Fields with Continuous Mass Spectrum

Within a relativistic real-time Green's function formalism, a quantum transport equation for the phase-space distribution function is derived without a quasi-particle approximation. Dissipation is due to a nonzero spectral width, and can be separated into time-local and memory effects.Comment: 25 pages LaTeX, 1 figure uuencoded, GSI-Preprint 94-1

Quantum Fields and Dissipation

The description of thermal or non-equilibrium systems necessitates a quantum field theory which differs from the usual approach in two aspects: 1.The Hilbert space is doubled; 2.Stable quasi-particles do not exist in interacting systems. A mini-review of these two aspects is given from a practical viewpoint including two applications. For thermal states it is shown how infrared divergences occuring in perturbative quasi-particle theories are avoided, whereas for non-equilibrium states a memory effect is shown to arise in the thermalization.Comment: Paper in ReVTeX, 12 pages. Figures and complete paper available via anonymous ftp at ftp://tpri6c.gsi.de/pub/phenning/h96neq, contribution to the Umezawa memorial volume of Physics Essay

Risk based bridge data collection and asset management and the role of structural health monitoring

Peer reviewedPostprin

Socio-economic Impact in a Region in the Southern Part of Jutland by the Establishment of a Plant for Processing of Bio Ethanol

A cooperation between The Farmers Association of Southern Jutland, Institute of Food Economics Department of Environmental and Business Economics, USD, and Centre for Rural Development, hosting Leader+ Denmark This report is a translation of the original report in Danish: (Jørgensen, H. P. and K. H.-Gregersen: Estimerede økonomiske virkninger i Syd- og Sønderjyl-land ved etablering af et anlæg til fremstilling af bioethanol, September 2003).