A flock-based model for ad hoc communication networks

We introduce a model for simulating the movement of semi-autonomous mobile units that exhibit swarm-based behaviour and collectively form a mobile ad-hoc communication network. The mobility model is used to study how the topological properties of the resulting communication network change over time. The connectivity graphs are determined by allowing each unit to communicate with others inside a given radius. By varying the free parameters of the mobility model, qualitatively different regimes of movement can be emulated. A number of properties of the graphs (e.g., the size of largest connected component, overall network efficiency and the number of isolated units) are calculated and compared for the different regimes. Finally, we present several directions for future work, both in terms of further applications and extensions of the present model. 1

Scenarios and Sustainability A Swedish Case Study of Adaptation Tools for Local Decision-Makers

Adaptation to climate change often involves long time frames and uncer-tainties over consequences of chosen adaptation measures. In this study, two tools developed for assisting local decision-makers in adaptation planning were tested: socio-economic scenarios and sustainability analy-sis. The objective was to study whether these tools could be of practical relevance to Swedish municipalities and foster local level climate change adaptation. We find that the municipal civil servants who participated in the testing generally considered the tools to be useful and of high rele-vance, but that more time was needed for using the tools than provided during the test process.climate change; adaptation; socio-economic scenarios; goal conflict; cost-benefit analysis

Galilean non-invariance of geometric phase

It is shown that geometric phase in non-relativistic quantum mechanics is not Galilean invariant.Comment: LaTeX, 6 pages, no figure