Now showing items 1-20 of 533

    • A 2.5-D Integrated Data Logger for Measuring Extreme Accelerations 

      Gakkestad, Jakob; Sollund, Tomas; Dalsjø, Per; Tveit, Bjørn; Taklo, Maaike Margrete Visser; Wright, Daniel Nilsen; Helland, Susanne; Kristiansen, Helge; Johnsen, Christian (2017)
      A very compact and rugged 2.5-D integrated data logger has been built and tested. The data logger is capable of measuring accelerations exceeding 70 000 g. Microcontroller and flash memory as bare dies have been mounted ...
    • 24 Hour Test of a Fuel Cell System for an Autonomous Underwater Vehicle 

      Gilljam, Martin; Weydahl, Helge; Lian, Torleif; Johannessen, Tom Cato; Holm, Sven Ivar; Hasvold, Jon Øistein (2016)
      The Norwegian Defence Research Establishment (FFI) has a long experience with power sources for autonomous underwater vehicles (AUVs). FFI has designed and built a power supply system based on a water-cooled and air-supplied ...
    • 250-MHz synchronously pumped optical parametric oscillator at 2.25–2.6 μm and 4.1–4.9 μm 

      Coluccelli, Nicola; Fonnum, Helge; Haakestad, Magnus Willum; Gambetta, Alessio; Gatti, Davide; Marangoni, Marco; Laporta, Paolo; Galzerano, Gianluca (2012)
      A compact and versatile femtosecond mid-IR source is presented, based on an optical parametric oscillator (OPO) synchronously pumped by a commercial 250-MHz Er:fiber laser. The mid-IR spectrum can be tuned in the range ...
    • A 3D Reactive Collision Avoidance Algorithm for Nonholonomic Vehicles 

      Syre Wiig, Martin; Pettersen, Kristin Ytterstad; Krogstad, Thomas Røbekk (2018)
      This paper presents a 3D reactive collision avoidance algorithm for vehicles with nonholonomic constraints. The algorithm steers the heading and pitch angle of the vehicle in order to maintain a constant avoidance angle ...
    • A 3D Reactive Collision Avoidance Algorithm for Underactuated Vehicles 

      Syre Wiig, Martin; Pettersen, Kristin Ytterstad; Krogstad, Thomas Røbekk (2018)
      This paper presents a 3D reactive collision avoidance algorithm for vehicles with underactuated dynamics. The underactuated states cannot be directly controlled, but are controlled indirectly by steering the direction of ...
    • 'Abdallah 'Azzam and Palestine 

      Hegghammer, Thomas (2013)
      ʿAbdallāh ʿAzzām (1941–1989) helped make jihadism more transnational by spearheading the effort to bring Muslim foreign fighters to Afghanistan in the 1980s. But why would a West Bank native devote himself to a war in ...
    • Accumulation of lead (Pb) in brown trout (Salmo trutta) from a lake downstream a former shooting range 

      Mariussen, Espen; Heier, Lene Sørlie; Teien, Hans-Christian; Pettersen, Marit Nandrup; Holth, Tor Fredrik; Salbu, Brit; Rosseland, Bjørn Olav (2017)
      An environmental survey was performed in Lake Kyrtjønn, a small lake within an abandoned shooting range in the south of Norway. In Lake Kyrtjønn the total water concentrations of Pb (14 µg/L), Cu (6.1 µg/L) and Sb (1.3 ...
    • Acoustic seabed classification using QTC IMPACT on single-beam echo sounder data from the Norwegian Channel, northern North Sea 

      Eidem, Ellen Johanne; Landmark, Knut (2013)
      Sediment mapping is important for understanding the physical processes, the impact of human activity, and the conditions for marine life on the seabed. For this purpose, the seabed classification tool QTC IMPACT analyses ...
    • Active spacecraft potential control investigation 

      Torkar, K.; Nakamura, R.; Tajmar, Martin; Scharlemann, C.; Jeszensky, H.; Laky, G.; Fremuth, G.; Escoubet, C. P.; Svenes, Knut Ragnar (2014)
      In tenuous plasma the floating potential of sunlit spacecraft reaches tens of volts, positive. The corresponding field disturbs measurements of the ambient plasma by electron and ion sensors and can reduce micro-channel ...
    • Adapting OLSR for WSNs (iOLSR) Using Locally Increasing Intervals 

      Larsen, Erlend; Flathagen, Joakim; Pham, Vinh Quang; Landmark, Lars (2012)
      Proactive link state routing protocols, popular within the Mobile Ad hoc NETwork framework, have not been as successful in wireless sensor networks. This is mainly due to the extensive energy usage by control traffic ...
    • Agile requirements handling in a service-oriented taxonomy of capabilities 

      Hannay, Jo Erskine; Bråthen, Karsten; Mevassvik, Ole Martin (2016)
      To get to grips with information systems portfolio development, strategic decisions tend towards service orientation and cloud deployment. Functionality should be presented as services that can be consumed from secure ...
    • All Molecular Surfaces are Equal: Demanding Invariance of Predictions in Linear Single-Variable Models 

      Kjønstad, Eirik; Moxnes, John Fredrik; Jensen, Tomas Lunde; Unneberg, Erik (2016)
      The molecular surface has been suggested to be a region of the molecule where information of non-covalent intermolecular interactions is present. Many workers have pursued this idea by constructing models based on statistical ...
    • All solid-state spectral broadening: An average and peak power scalable method for compression of ultrashort pulses 

      Seidel, Marcus; Arisholm, Gunnar; Brons, Jonathan; Pervak, Vladimir; Pronin, Oleg (2016)
      Spectral broadening in bulk material is a simple, robust and low-cost method to extend the bandwidth of a laser source. Consequently, it enables ultrashort pulse compression. Experiments with a 38 MHz repetition rate, 50 ...
    • Analysis of detection performance of incoherent range walk compensation for passive radar 

      Finden, Erlend; Christiansen, Jonas Myhre; Lie-Svendsen, Øystein; Olsen, Karl Erik (2015)
      This paper analyzes the performance of an incoherent range walk compensation method for passive radar systems. The method utilizes the velocity information in the range-Doppler map, and no detection before compensation ...
    • Anisotropic scattered data interpolation for pushbroom image rectification 

      Ringaby, Erik; Friman, Ola; Forssén, Per-Erik; Opsahl, Thomas Olsvik; Haavardsholm, Trym Vegard; Kåsen, Ingebjørg (2014)
      This paper deals with fast and accurate visualization of pushbroom image data from airborne and spaceborne platforms. A pushbroom sensor acquires images in a line-scanning fashion, and this results in scattered input data ...
    • Anisotropy and shear-layer edge dynamics of statistically unsteady,stratified turbulence 

      Wingstedt, Emma My Maria; Fossum, Hannibal Eie; Reif, Bjørn Anders Pettersson; Werne, Joseph (2015)
      Direct numerical simulation data of an evolving Kelvin-Helmholtz instability have been analyzed in order to characterize the dynamic and kinematic response of shear-generated turbulent flow to imposed stable stratification. ...
    • Ansar al-Sharia in Libya: An Enduring Threat 

      Gråtrud, Henrik; Skretting, Vidar Benjamin (2017)
      Ansar al-Sharia in Libya (ASL) is one of the most powerful jihadi groups in Libya and it might, in fact, represent a more significant long-term threat than IS’ provinces in Libya. However, there are few recent studies of ...
    • Antenna Processing Optimization for a Colocated MIMO Radar 

      Nysæter, Asgeir Bjarneson; Iwe, Harald (2016)
      In a practical colocated MIMO radar design case, there will often not be a free choice of locations for single element antennas. Antenna parts may be available as rectangular arrays of antenna elements located on tiles, ...
    • Architectural work for modeling and simulation combining the NATO Architecture Framework and C3 Taxonomy 

      Hannay, Jo Erskine (2016)
      To provide modeling and simulation functionality as services is strategically leveraged in the defense domain and elsewhere. To describe and understand the context, the ecosystem, wherein such services are used and ...
    • Arctic Maritime Surveillance With Sentinel-1 Data Using a Norwegian Collaborative Ground Segment 

      Hannevik, Tonje Nanette Arnesen; Viken, Kjell Ove; Olsen, Richard Bjarne; Lensjø, Øyvind Kinden (2017)
      The Sentinel-1A and Sentinel-1B C-band Synthetic Aperture Radar (SAR) satellites provide data for European Union's Copernicus program. Norway uses SAR satellites operationally to monitor Norway's maritime areas of interest. ...