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    • Why People Use Chatbots 

      Brandtzæg, Petter Bae; Følstad, Asbjørn (Chapter, 2017)
      There is a growing interest in chatbots, which are machine agents serving as natural language user interfaces for data and service providers. However, no studies have empirically investigated people’s motivations for using ...

    • Wide-Band Transformer Modeling Including Core Non-Linear Effects 

      Gustavsen, Bjørn Alfred (Journal article; Peer reviewed, 2015)
      Wide-band, black-box transformer models can be obtained via frequency sweep measurements on transformer terminals followed by rational model extraction via passive curve fitting. These models do however not include core ...

    • Will 10 MW wind turbines bring down the operation and maintenance cost of offshore wind farms? 

      Hofmann, Matthias; Sperstad, Iver Bakken (Peer reviewed; Journal article, 2014)
      Larger wind turbines are believed to be advantageous from an investment and installation perspective, since costs for installation and inner cabling are dependent mainly on the number of wind turbines and not their size. ...

    • Wind farm control - Part I: A review on control system concepts and structures 

      Andersson, Leif Erik; Anaya-Lara, Olimpo; Tande, John Olav Giæver; Merz, Karl Otto; Imsland, Lars Struen (Peer reviewed; Journal article, 2021)
      Wind farm control design is a recently new area of research that has rapidly become a key enabler for the development of large wind farm projects and their safe and efficient connection to the power grid. A comprehensive ...

    • Wind farm voltage dip measurements 

      Marvik, Jorun Irene; Tande, John Olav Giæver; Uhlen, Kjetil (Journal article; Peer reviewed, 2014)
      This paper is based on continuous measurements of voltages and currents from three wind farms for a period of 1 year, and the focus is on voltage dips. The purpose is to get an overview of the characteristics and rate of ...

    • Wind Power Plant Transmission System Modelling for Harmonic Propagation and Small-signal Stability Analysis 

      Kocewiak, Lukasz; Gustavsen, Bjørn Alfred; Holdyk, Andrzej (Chapter, 2017)

    • Wind power within European grid codes: Evolution, status and outlook 

      Vrana, Til Kristian; Flynn, Damian; Gómez-Lázaro, Emilio; Kiviluoma, Juha; Marcel, Davy; Cutululis, Nicolaos Antonio; Smith, J. Charles (Journal article; Peer reviewed, 2018)
      Grid codes are technical specifications that define the requirements for any facility connected to electricity grids. Wind power plants are increasingly facing system stability support requirements similar to conventional ...

    • Wind pressure coefficients for roof ventilation purposes 

      Gullbrekken, Lars; Uvsløkk, Sivert; Kvande, Tore; Pettersson, Kaj; Time, Berit (Journal article; Peer reviewed, 2018)
      Wind pressure coefficients (cp) are important inputs for analytical calculations of wind load. The aim of this research is to investigate wind pressure coefficients on a test house located in Norway in order to pave the ...

    • Wind Turbine Model Validation with Measurements 

      Marvik, Jorun Irene; Endegnanew, Atsede Gualu (Peer reviewed; Journal article, 2012)
      The objective of this work is to validate wind turbine models available in commercial simulation tools with measurements. Results are shown for two turbines located in two different wind farms; wind turbine 1 is a fixed ...

    • Wind-driven rain tightness of building-integrated photovoltaics panels 

      Moschetti, Roberta; Gullbrekken, Lars; Asphaug, Silje Kathrin (Peer reviewed; Journal article, 2023)
      The exposure to wind-driven rain (WDR) is a key factor impacting the performance and the durability of the building envelope. Building-integrated photovoltaic (BIPV) panels are increasingly used as roofing and façade ...

    • Window Size Effects on Subjective Impressions of Daylit Spaces: Indoor Studies at High Latitudes Using Virtual Reality 

      Moscoso Paredes, Claudia Trinidad; Chamilothori, Kynthia; Wienold, Jan; Andersen, Marilyne; Matusiak, Barbara Szybinska (Peer reviewed; Journal article, 2020)
      Daylight provision to the indoor space is affected by different building elements that cannot be fully controlled by the users, such as the window size of a space. The dimensions of the fenestration not only affect the ...

    • Window with integrated solar collector : Climate resistance evaluation report 

      Risholt, Birgit Dagrun; Asphaug, Silje Kathrin; Busklein, Jan Ove; Uvsløkk, Sivert; Rognvik, Egil; Grynning, Steinar (ZEB Project report;26, Research report, 2015)
      The NorDan solar collector is a window/solar collector combination which can be mounted as a traditional window in the façade of a new building. The component is originally designed for new buildings, but the research and ...

    • Windowed PWM: A Configurable Modulation Scheme for Modular Multilevel Converter-Based Traction Drives 

      de Simone, Davide; Tricoli, Pietro; D'Arco, Salvatore; Piegari, Luigi (Peer reviewed; Journal article, 2020)
      This article introduces a modulation technique for modular multilevel converter (MMC) in variable speed traction drives for electrical transportation referred as windowed pulsewidth modulation (W-PWM). The windowed PWM ...

    • Windows in existing buildings - maintenance, upgrading or replacement? Windows in existing buildings in a sustainable perspective 

      Fossdal, Sverre (Prosjektrapport (Norges Byggforskningsinstitutt);192, Research report, 1996)

    • Windows. Recent research and experiences made by Norwegian Building Research Institute 

      Breder, Kristin; Dreier, Carsten; Gjelsvik, Tore; Heiersted, Roy S.; Nielsen, Anker F. (Prosjektrapport (Norges Byggforskningsinstitutt);1, Research report, 1985)
      At the Norwegian Building Research Institute, we have been working with window research and development for many years and have made it one of our main fields of interest Different types of specialized testing equipment ...

    • Winter concreting full-scale field trial of rock tower foundations 

      Petrich, Christian; Sæther, Irina Vasiljeva; Arntsen, Bård (Lecture, 2018)
      Winter concreting can be an attractive option for construction in remote areas where concerns about wildlife and soil integrity are prioritized. In order to minimize disturbance of wildlife and to be able to access remote ...

    • Wire and Arc Additive Manufacturing with TiC-Nanoparticle Reinforced AA5183 Alloy 

      Langelandsvik, Geir; Ragnvaldsen, Olav; Flåm, Jan Eskil; Akselsen, Odd Magne; Roven, Hans Jørgen (Peer reviewed; Journal article, 2020)
      Wire and arc additive manufacturing of aluminium-ceramic composites shows great potential to produce high strength materials. By incorporation of nanoparticles in the feedstock wire, fine-grained material with low ...

    • Wire arc additive manufacturing of AA5183 with TiC nanoparticles 

      Langelandsvik, Geir; Eriksson, Magnus; Akselsen, Odd M.; Roven, Hans Jørgen (Peer reviewed; Journal article, 2021)
      Aluminium alloys processed by wire arc additive manufacturing (WAAM) exhibit a relatively coarse microstructure with a columnar morphology. A powerful measure to refine the microstructure and to enhance mechanical properties ...

    • Wire-arc additive manufacturing of structures with overhang: Experimental results depositing material onto fixed substrate 

      Evjemo, Linn Danielsen; Langelandsvik, Geir; Moe, Signe; Danielsen, Morten Høgseth; Gravdahl, Jan Tommy (Peer reviewed; Journal article, 2022)
      As additive manufacturing (AM) technology grows both more advanced and more available, the challenges and limitations are also made more evident. Most existing solutions for AM build structures layer by layer using strictly ...

    • Wireless Communication Technologies for Safe Cooperative Cyber Physical Systems 

      Balador, Ali; Kouba, A; Cassioli, Dajana; Foukalas, Fotis; Severino, Ricardo B.; Stepanova, Daria; Agosta, Giovanni; Xie, Jing; Pomante, Luigi; Mongelli, Maurizio; Pierini, Pierluigi; Petersen, Stig; Sukuvaara, Timo (Journal article; Peer reviewed, 2018)
      Cooperative Cyber-Physical Systems (Co-CPSs) can be enabled using wireless communication technologies, which in principle should address reliability and safety challenges. Safety for Co-CPS enabled by wireless communication ...