In a storage-ring free-electron laser (FEL), the onset and growth of intra-cavity power at the resonator wavelength can be naturally accompanied by coherent emission at higher harmonics. Contrary to what happens in singlepass linac-based devices, the electron beam is re-circulated in the storage ring and, while the microbunching becomes "thermalized" from turn to turn, the evolution of other bunch

Single-pass free-electron lasers constitute an example of systems with long-range interactions. The light-particle interplay leading to the power growth and successive relaxation towards a quasi-stationary state is governed by the Vlasov equation. A maximum entropy principle inspired to Lynden-Bell's theory of "violent relaxation" for the Vlasov equation can be invoked to analytically characterize

In vivo dosimetry of IMRT from Copenhagen University Hospital

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98 procent av all forskning och utveckling sker utanför Sverige. Bästa vägen till högre välstånd bygger på strategin att vi måste bli väsentligt bättre på att hitta innovationer, var i världen de än finns. Det är viktigare än att tro att nya high-techföretag ska fixa allt, skriver Johan Schlasberg, vd för mobiltjänstföretaget IDmessage (IDstories).

Owing to the significant societal value of inland water resources, there is a need for cost-effective monitoring of water quality on large scales. We tested the suitability of the recently launched Sentinel-2A to monitor a key water quality parameter, coloured dissolved organic matter (CDOM), in various types of lakes in northern Sweden. Values of a(420)CDOM (CDOM absorption at 420 nm wavelength)

Pollination deficits are widespread in current agriculture, so improving management for crop pollination is critical. Here we review the two most common management approaches to enhance crop pollination, species and habitat management, by providing referenced lists of successful examples. We pinpoint that these approaches have been studied in isolation from each other, with little discussion on po

We study asymptotic properties of the following Markov system of N≥3 points in [0, 1]. At each time step, the point farthest from the current centre of mass, multiplied by a constant p>0, is removed and replaced by an independent ζ-distributed point; the problem, inspired by variants of the Bak–Sneppen model of evolution and called a p-contest, was posed in Grinfeld et al. (J Stat Phys 146, 378–40

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"Debatten kring de offentliga monopolens framtid kretsar i allmänhet kring två alternativ; den fria konkurrensen kontra det traditionella monopolet. I själva verket är båda dessa behärskade med allvarliga brister, menar organisationskonsulten och forskaren Johan Schlasberg som vill lansera ett nytt begrepp "det öppna monopolet".

En studierektor för doktorander bör inte samtidigt vara handledare eller biträdande handledare. Intressekonflikter kan uppstå. En doktorand kan hamna i en onödig och svår valsituation.

Adding hydrogen atoms and protonation states to structures of membrane proteins requires successful implementation of neutron macromolecular crystallography (NMX). This information would significantly increase our fundamental understanding of the transport processes membrane proteins undertake. To grow the large crystals needed for NMX studies requires significant amounts of stable protein, but on

The development of neutralizing antibodies is a rare complication of von Willebrand disease treatment. In major surgical procedures for severe forms of the disease, the recognition of ineffective therapy and alternative treatment protocols are lifesaving. We report the case of a 6-year-old girl with type 3 von Willebrand disease in whom inhibitors were sought due to ineffective haemostasis togethe