The large-scale thickness distribution of sea ice was measured during several campaigns in the European Arctic north of Svalbard from 2007 using an airborne electromagnetic induction device. In August 2010 and April-May 2011, this was complemented by extensive on-ice work including measurements of snow thickness and freeboard. Ice thicknesses show a clear difference between the seasons, with thicker ice during spring than in summer. In spring 2011, negative freeboard and flooding were observed as a result of the extensive snow cover. We find that the characteristics of the first-year sea ice allow combining observations from different years. The ice thickness in the marginal ice zone increases with increasing latitude and increasing distance to the ice edge; however, in the inner ice pack from ∼100 km from the ice edge the thickness remains almost constant. Modal ice thickness in spring reaches 2.4 m whereas in summer it is 1.0–1.4 m. Our study provides new insight into ice thickness distributions of a typical ice cover consisting of mainly first- and second-year ice, which may become the dominant ice type in the Arctic in the future.

Proton transfer reaction-mass spectrometry (PTR-MS) offers many advantages for trace gas analysis, including no sample preparation, real-time analysis, high selectivity and sensitivity, ultra-low detection limits and very short response times. These characteristic features have made it an ideal tool for many applications in science, technology and society. Here we will discuss recent developments, in particular advances concerning sensitivity, selectivity and general applicability.

Aim – We aimed at developing a prioritized set of quality indicators for schizophrenia care to be used for continuous quality monitoring. They should be evidence-based and rely on routine data. Methods – A systematic literature search was performed to identify papers on validated quality indicators published between 1990 to April 2008 in MEDLINE, the Cochrane databases, EMBASE and PsycINFO. Databases of relevant national and international organizations were searched. Indicators were described with respect to meaningfulness, feasibility and actionability. A workshop with relevant stakeholders evaluated the measures through a structured consensus process. Results – We identified 78 indicators through literature search and selected 22 quality indicators. Furthermore, 12 structural and case-mix indicators were choosen. Only five quality indicators were rated “essential indicators” (priority 1), 14 were rated “additional first choice” (priority 2), and three were rated as “additional second choice” (priority 3). Only four indicators assessed outcome quality. In the majority of indicators the evidence base supporting the indicator recommendation was weak. None of the selected indicators was validated in experimental studies. Conclusions – Evidence and validation base played only a subordinate role for indicator prioritisation by stakeholders indicating that there are discrepancies between clinical questions and requirements in schizophrenia care and scientific research.

Declaration of Interest: Stefan Weinmann and Thomas Becker received an unrestricted grant from the Federal Association of Local Health Funds (AOK-BV) for the whole project. Christiane Roick is an employee of the AOK-BV. All authors declare that there are no other financing arrangements or payments that might be considered a conflict of interests related to the present paper.

The microstructure and crystallization kinetics of electron beam evaporated Si on ZnO:Al coated glass for polycrystalline solar cells was studied by electron backscatter diffraction and optical microscopy at various deposition temperatures. A time dependent analysis of the dynamics of the crystallization allowed for the individual determination of growth and nucleation processes. The nucleation process of Si on ZnO:Al was found to be influenced by a variation of the deposition temperature of the amorphous Si in a critical temperature regime of 200 ˚C to 300 ˚C. The nucleation rate decreased significantly with decreasing deposition temperature, while the activation energy for nucleation increased from 2.9 eV at a deposition temperature of 300 ˚C to 5.1 eV at 200 ˚C, resulting in poly-Si which comprised grains with features sizes of several μm.