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On the single-particle spectrum of an interacting electron gas

n the many-body theory of conduction electrons in a metal the single-particle spectrum is described not simply by the energy versus momentum relation as in band theory but by a function that describes the actual shape of the spectrum for a given momentum and has an appreciable spread in energy. Calculations of the spectral strength function for electrons in a uniform electron gas are described, wh

Another attack on A5/1

A5/1 is a stream cipher used in the GSM system. Several time-memory trade-off attacks against A5/1 have been proposed previously. This paper presents a completely different attack, based on ideas from correlation attacks.

Robustness of Spatial Databases against Intentional Attacks and Random Errors

Demands on the quality and reliability of volunteered geographic information have increased because of its rising popularity. Due to the less controlled data entry, there is a risk that people provide false or inaccurate information to the database. One factor that affects the effect of such updates is the structure of the database schema, which in this paper is described by network models. By ana

Energy Crops and the Common Agricultural Policy

The Biomass Action Plan (BAP) for Europe outlines how to achieve the targets for bioenergy and energy crops defined by the European Commission and member states. However, it is the Common Agricultural Policy (CAP) that shapes the utilisation of agricultural land. This paper therefore reviews the supportive measures for energy crops in recent CAP reforms and investigates the effects on farmers in ‘