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  • Resultat 1-10 av 205448
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  • Abramowski, A., et al. (författare)
  • Acceleration of petaelectronvolt protons in the Galactic Centre
  • 2016
  • Ingår i: Nature. - 0028-0836. ; 531:7595, s. 476-479
  • Tidskriftsartikel (refereegranskat)abstract
    • Galactic cosmic rays reach energies of at least a few petaelectronvolts(1) (of the order of 1015 electronvolts). This implies that our Galaxy contains petaelectronvolt accelerators ('PeVatrons'), but all proposed models of Galactic cosmic-ray accelerators encounter difficulties at exactly these energies(2). Dozens of Galactic accelerators capable of accelerating particles to energies of tens of teraelectronvolts (of the order of 10(13) electronvolts) were inferred from recent gamma-ray observations(3). However, none of the currently known accelerators-not even the handful of shell-type supernova remnants commonly believed to supply most Galactic cosmic rays-has shown the characteristic tracers of petaelectronvolt particles, namely, power-law spectra of.-rays extending without a cut-off or a spectral break to tens of teraelectronvolts(4). Here we report deep.-ray observations with arcminute angular resolution of the region surrounding the Galactic Centre, which show the expected tracer of the presence of petaelectronvolt protons within the central 10 parsecs of the Galaxy. We propose that the supermassive black hole Sagittarius A* is linked to this PeVatron. Sagittarius A* went through active phases in the past, as demonstrated by X-ray outbursts(5) and an outflow from the Galactic Centre(6). Although its current rate of particle acceleration is not sufficient to provide a substantial contribution to Galactic cosmic rays, Sagittarius A* could have plausibly been more active over the last 10(6)-10(7) years, and therefore should be considered as a viable alternative to supernova remnants as a source of petaelectronvolt Galactic cosmic rays.
  • Abramsson, Mia, et al. (författare)
  • Research and development projects aiming to increase young adults’ knowledge of energy and energy efficiency
  • 2015
  • Ingår i: eceee Summer Study proceedings. - European Council for an Energy Efficient Economy (ECEEE). - 978-91-980482-6-1 (print) - 978-91-980482-7-8 (online) ; s. 509-514
  • Konferensbidrag (refereegranskat)abstract
    • Children and young adults are important target groups in order to decrease the climate change effects and increase an energy-efficient end use. With increased knowledge and awareness these target groups could play a constructive role in the current and future transition of the energy system. The correlation between knowledge, awareness and behavioral change is central for improved energy efficiency in the society. Children and young adults and their interest in the natural and technical science are central to ensure the long-term capability needed to transform the energy system.To support this development the Swedish Energy Agency started with young adults as a target group in research and development projects in 2008. Since then approximately 5 million EUR has been allocated for projects aiming to increase knowledge in these areas among young adults by developing practical methods and tools, educational material or in-service training for teachers. Around thirty projects have been supported and three of them, KNUT school development project, KNUT evaluation research project and The Energy Fall, will be discussed in this paper. The KNUT school development project is a national school project aiming at increasing students’ knowledge and interest in energy and energy efficiency. KNUT also stimulates learning and career choices related to energy, climate and resources and therefor strengthen Sweden's capacities and competitiveness future in these areas. To ensure the scientific base a research group from Linköping University (KNUT evaluation research project) has followed the project’s activities. Best practices of methods and tools have been tested and disseminated within the project at both regional and national level. The KNUT evaluation research project has identified and analyzed five success factors regarding energy, climate change and energy efficiency of importance for education: The relationships between the national, regional and local levelThe function of education vary in time due to the development of societyGet to know the education content inside and outside of schoolSuccessful meetings between different actorsThe educational systems capacity to educate all and at the same time recruit some for specializationThis paper will present an overview of the Swedish Energy Agency’s work on research and development projects aiming to increase young adults’ knowledge of energy and energy efficiency and the KNUT evaluation research project results, analysis and success factors.
  • Advanced Bioelectronic Materials
  • 2015
  • Samlingsverk (redaktörskap) (övrigt vetenskapligt)abstract
    • This book covers the recent advances in the development of bioelectronics systems and their potential application in future biomedical applications starting from system design to signal processing for physiological monitoring, to in situ biosensing.Advanced Bioelectronics Materialshas contributions from distinguished international scholars whose backgrounds mirror the multidisciplinary readership ranging from the biomedical sciences, biosensors and engineering communities with diverse backgrounds, interests and proficiency in academia and industry. The readers will benefit from the widespread coverage of the current literature, state-of-the-art overview of all facets of advanced bioelectronics materials ranging from real time monitoring, in situ diagnostics, in vivo imaging, image-guided therapeutics, biosensors, and translational biomedical devices and personalized monitoring.
  • Aid, Graham, 1980-, et al. (författare)
  • Action Research In Waste Management Application to construction and demolition waste in the Stockholm region
  • 2010
  • Ingår i: Linnaeus ECO-TECH ´10. - Linnaeus University. ; s. 1009-1019
  • Konferensbidrag (refereegranskat)abstract
    • The action research methodology and several of its methods have previously been highlighted and described by the authors as a fitting and rigorous framework approach for complex waste management systems.  This was in response to criticism of the ex ante selection of traditional empiric systems analysis tools to provide decision support and ‘sustainable improvement’ in such complex systems which often involve strong human and political factors.   Several of the action research methods described have recently been utilized in a case study around mineral (aggregate) construction and demolition waste in the Stockholm region.  These methods were integrated through a series of workshops and work areas undergone together with project members from several private and public sectors.  Leaving the problem fuzzy (loosely defined) in the beginning; utilizing convergent interviewing, rich pictures and focus groups allowed the researchers and partner stakeholders to identify not one but several problem areas within the system of focus.  Indicator creation and a dialectic processes were then used to identify qualitative and quantitative aspects of salience around these problem areas.  These resulting indicators were strengthened through a process of verification.  Each indicator was then analyzed by what was deemed to be appropriate and transparent means.  It is argued that this approach may create better communication, transparency, and understanding by the stakeholders.  These factors in turn allowing stronger stakeholder ownership of the process and assisting in more informed decisions and help to provide stability for desired change. However the process was not without its drawbacks such as intense communication and time requirements.
  • Aili, Hans, 1947-, et al. (författare)
  • Jacob Theodor Klein's Critique of Peter Artedi's Ichthyologia (1738)
  • 2014
  • Ingår i: Svenska Linnésällskapets årsskrift. - 0375-2038. ; s. 39-84
  • Tidskriftsartikel (refereegranskat)abstract
    • An anonymous critique of Peter Artedi’s (1705‒1735) Ichthyologia sive opera omnia de piscibus, the latter edited and published posthumously by Carolus Linnaeus (1707‒ 1778) in 1738, is shown to have been written by the Prussian jurist and naturalist Jacob Theodor Klein (1685‒1759), and sent to Hans Sloane (1660−1753) in London for his approval. The critique is transcribed and translated, and its contents assessed in light of Artedi’s contribution to Linnaean systematics. While in some ways highly critical of Artedi, Klein must have been well aware that by criticizing Artedi he was, by association, criticizing Linnaeus as well. Linnaeus’s editorial contributions to the Ichthyologia as well as his on-going antagonistic relationship with Klein are also discussed.
  • Anderson, Nils-Eric, 1955-, et al. (författare)
  • Storsatsning på Hantverkskunnandet
  • 2012
  • Ingår i: Byggindustrin 2012-08-22. - 1104-5981.
  • Tidskriftsartikel (populärvet., debatt m.m.)
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