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Sökning: WFRF:(Sveningsson M.)

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1.
  • Axelsson, S., et al. (författare)
  • Theoretical and experimental investigations of three-terminal carbon nanotube nanorelays
  • 2005
  • Ingår i: New J. Phys. - 1367-2630. ; 7
  • Tidskriftsartikel (refereegranskat)abstract
    • We present theoretical and experimental investigations of three-terminal nanoelectromechanical relays based on suspended carbon nanotubes. A charge is induced in the nanotube by applying a voltage to an underlying gate electrode thus inducing the nanotube to bend and make contact with a drain electrode. Such devices have potential applications as fast switches, logic devices, memory elements and pulse generators. We describe two modes of operation: a contact mode where the nanotube makes physical contact with the drain electrode and a non-contact mode where electrical contact between the nanotube and the drain electrode is made via a field emission current.
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  • Hansson, K., et al. (författare)
  • Materializing activism
  • 2020
  • Ingår i: ECSCW 2019 - Proceedings of the 17th European Conference on Computer Supported Cooperative Work. - : European Society for Socially Embedded Technologies (EUSSET).
  • Konferensbidrag (refereegranskat)abstract
    • Net activism shows how easily available tools allow the organization of social movements to be scaled up and extended globally. These media ecologies enable new forms of power. This one-day workshop gathers researchers focusing on the collaborative efforts within social movements, looking into the socio-technical systems; the organization of activism; the relations between traditional and social media; and the complex network of systems, information, people, values, theories, histories, ideologies and aesthetics underlying various types of activism. The workshop consists of brainstorming sessions where we materialize the intangible and develop our theories and ideas further through a collaborative design process.
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  • Hansson, K., et al. (författare)
  • “We passed the trust on” : Strategies for security in #MeToo activism in Sweden
  • 2020
  • Ingår i: ECSCW 2019 - Proceedings of the 17th European Conference on Computer Supported Cooperative Work. - : European Society for Socially Embedded Technologies (EUSSET).
  • Konferensbidrag (refereegranskat)abstract
    • The #metoo movement can serve as a case for how networked online environments can provide settings for the mobilization of social movements, while also entail serious risks for those involved. In Sweden, over hundred thousand people were engaged in activities against sexual harassments and abuse, where social media were used to collect testimonies and to draft and discuss petitions that were later published in print news media. While HCI research on trust focus on how people trust technical systems, the authorities behind the system, or the user generated data, trust between peers in vulnerable communities is less researched. In this study, based on semi-structured interviews and a survey that involved 62 organizers of the Swedish #metoo movement, we therefore look into the question of how a secure and supportive environment was achieved among participants despite the scale of the activism. The result shows how trust was aggregated over networks of technical systems, institutions, people, shared values and practices. The organizers of the petitions used tools and channels at their disposal such as e.g. already established social media contexts that enabled the #metoo petitions to be formed easily and spread quickly. Establishing a supportive culture based on recognition and shared values was central for the movement. However, when the activism was scaled up, strategies were used to increase security by clarifying rules and roles, limiting access to information, restricting access to groups, and limiting the scope of communication.
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  • Sundkvist, S. G., et al. (författare)
  • On-going development and recent results of the research in the Swedish Gas Turbine Centre (GTC)
  • 2004
  • Ingår i: Proc. ASME Turbo Expo. ; , s. 261-268
  • Konferensbidrag (refereegranskat)abstract
    • This paper describes a way of co-operation between industries, universities and government that has proven to be very fruitful. The Swedish Gas Turbine Centre (GTC) is constituted as a research consortium between technical universities and gas turbine industry. The overall goal of the centre, that was founded in 1996 on a governmental initiative, is to build up a basis of knowledge at Swedish universities to support the industrial development in Sweden of gas turbines of the future with expected requirements on low emissions, high efficiencies, high availability, and low costs. Since the start the research has had a focus on high temperature components of gas turbines (combustion chamber and turbine). This is also reflected in the on-going development phase where the research program consists of four project areas: cooling technology, combustion technology, aeroelasticity, and life time prediction of hot components. The projects are aiming at developing design tools and calculation and verification methods within these fields. A total of eleven research students (among them one industrial PhD student) are active in the centre at present. Numerical analysis as well as experimental verification in test rigs are included. The program has so far produced eleven Licentiate of Engineering and five PhD. On-going activities and recent results of the research in the four research areas are presented: A new test rig for investigation of time-dependent pressures of three-dimensional features on a vibrating turbine blade at realistic Mach, Reynolds and Strouhal numbers and first experimental results. Results of numerical simulations of heat loads on turbine blades and vanes, especially platform cooling. First results of numerical investigations of combustion and thermo-acoustic instabilities in gas turbine chambers. Experimental investigation of crack propagation in gas turbine materials using the scanning electron microscope (SEM).
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  • Sveningsson, M., et al. (författare)
  • Raman spectroscopy and field-emission properties of CVD-grown carbon-nanotube films
  • 2001
  • Ingår i: Applied Physics a-Materials Science & Processing. ; 73, s. 409-418
  • Tidskriftsartikel (refereegranskat)abstract
    • Carbon-nanotube films are very efficient cathodes for field-emission devices. This study presents a comprehensive comparison between structural, spectroscopic and field-emission properties of films of aligned and non-aligned multi-wall nanotubes (MWNTs) which are grown by thermal chemical vapour deposition. Three types of films are investigated: vertically aligned MWNTs with clean and coated nanotube side walls as well as non-aligned MWNT films. Raman spectra taken on the aligned MWNT films consist of many lines of first-, second- and third-order signals. Several lines are reported here far the first time for MWNTs. The presence of the surface coating leads to a decrease and broadening of the higher-order signals as well as an increase in the disorder-induced contributions in the first-order regime. The aligned MWNT films have excellent field-emission properties with very high emission current densities and low turn-on and threshold fields. The presence of a surface coating has no impact on the efficiency of the field-emission process. Films of non-aligned MWNTs show considerably reduced electron-emission current densities and larger critical fields.
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