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Valid inequalities for a shortest-path routing optimization problem

In autonomous systems of the Internet packets are routed on shortest paths to their destinations, for example according to the ECMP principle. The problem of finding a feasible traffic routing configuration realized on paths which can be generated by a system of weights assigned to IP links is NP-hard. This problem can be formulated as a mixed-integer program and attempted with a branch-and-cut al

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Short note on the explanation of the depopulation of Greenland as an example of the so called agrarian crisis in the Middle Ages. This explanation was proposed by Thorkild Kjærgaard.

How In-Service Experience Informs Design Modifications: A Case Study in Aero Engines

This research is triggered by a fundamental shift that is occurring in the manufacture and marketing of aero engines for commercial and defence purposes, away from the selling of products to the provision of services. Under the emerging ‘power by the hour’ paradigm, aero engines are effectively leased to the airlines, with the manufacturing company remaining responsible for their maintenance and r

Rapidity density distributions in 16O, 28Si, 32S, 197Au, and 208Pb induced heavy-ion interactions at 4A–200A GeV

The mass, energy, and centrality dependence of rapidity density distributions of relativistic, charged particles, produced in heavy-ion interactions in the energy range 4A–200A GeV, are investigated. The results indicate that the rapidity density distributions show systematic variations, which are used to predict distributions for Au+Au and Pb+Pb interactions in a model-independent way.