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Magnetic phases near the Van Hove singularity in s- and d-band Hubbard models

We investigate the magnetic instabilities of the nondegenerate (s-band) and a degenerate (d-band) Hubbard model in two dimensions using many-body effects due to particle-particle diagrams and Hund’s rule local correlations. The density of states and the position of the Van Hove singularity change depending on the value of next-nearest-neighbor hopping t′. The Stoner parameter is strongly reduced i

Software Configuration Management Problems and Solutions to Software Variability Management

These days more and more software is produced as product families. Products that have a lot in common, but all the same vary slightly in one or more aspects. Developing and maintaining these product families is a complex task. Software configuration management (SCM) can, in general, support the development and evolution of one single software product and to some degree also supports the concept of

Integrating microorganism and macroorganism dispersal: modes, techniques and challenges with particular focus on co-dispersal.

Whatever their size and the ecosystem they live in, all organisms may disperse at some stage of their life cycle. Dispersal dynamics are to a varying extent dependent on organismal size, life history, ecological niche, survival capacities and phylogeny. Moves towards a synthesis in dispersal ecology have focused primarily on vertebrates and higher plants, yet recent studies suggest that the disper

Distributed Kalman Filtering Using Weighted Averaging

This paper addresses the problem of distributed Kalman filtering, with focus on limiting the required communication bandwidth. By distributed we refer to a scenario when all nodes in the network desire an estimate of the full state of the observed system and there is no centralized computation center. Communication only takes place between neighbors and only a fixed number of times each sample. To

Evaluation and Documentation through Participatory Scriptwriting

I have documented creativity workshops and collected ethnographic data for evaluation purpose through a method I call participatory scriptwriting. The main purpose with the method has been to reach an understanding of how the participants perceive their reality through synthesizing their impressions of the workshops in a short manuscript. When the workshop has ended they have acted according to th

Tracking time-variant cluster parameters in MIMO channel measurements: algorithm and results

This paper presents a joint clustering-and-tracking framework to identify time-variant cluster parametersfor geometry-based stochastic MIMO channel models.The method uses a Kalman filter for tracking and predicting cluster positions, a novel consistentinitial guess procedure that accounts for predicted cluster centroids, and the well-known KPower-Means algorithm for cluster identification.We teste