Viser treff 105-124 av 309

    • Examination of turbulence impacts on ultra-short-term wind power and speed forecasts with machine learning 

      Chen, Hao; Birkelund, Yngve; Yuan, Fuqing (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-11-25)
      Wind turbines’ economic and secure operation can be optimized through accurate ultra-short-term wind power and speed forecasts. Turbulence, considered as a local short-term physical wind phenomenon, affects wind power generation. This paper investigates the use of turbulence intensity for ultra-short-term predictions of wind power and speed with a wind farm in the Arctic, including and excluding ...
    • An experimental analysis of the impact of thermal protective immersion suit and angle of heel on individual walking speeds 

      Azizpour, Hooshyar; Galea, Edwin R.; Erland, Sveinung; Batalden, Bjørn-Morten; Deere, Steven; Oltedal, Helle Asgjerd (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-04-16)
      Background: Incarcerated individuals have poor mental health compared to the general population. Social support has a benefcial efect on mental health. The bufering model proposes that social support facilitates coping under stressful conditions, while the main efects model suggests that belonging to social networks and having positive social interactions are benefcial for mental health. Prisons ...
    • Experimental and numerical engine cycle setup for a dual fuel hydrogen, methane, and hythane with diesel to assess the effect of water injection and nozzle geometry 

      Taghavifar, Hadi (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-06-15)
      In this study, the potential of gaseous fuels such as hydrogen, methane, and hythane in combination with diesel fuel is assessed in a closed loop thermodynamic framework. An experimental test is conducted with basic diesel fuel and then the model is configured based on the realistic one-cylinder diesel engine to evaluate the robustness and reliability of the simulation. The model is accurate in terms ...
    • Experimental and simulated evaluations of airborne contaminant exposure in a room with a modified localized laminar airflow system 

      Cheng, Zhu; Aganovic, Amar; Cao, Guangyu; Bu, Zhongming (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-02-15)
      The traditional mixing ventilation is not an energy effective approach to remove indoor air pollutants, maintain breath zone air quality, and control the airborne transmission. This study investigated the potential of a localized laminar airflow ventilation system to alleviate human exposure to pollutants. Breathing thermal manikins with sitting posture and supine posture were used to simulate the ...
    • An expert-based approach to production performance analysis of oil and gas facilities considering time-independent Arctic operating conditions 

      Naseri, Masoud; Barabady, Javad (Journal article; Tidsskriftartikkel, 2016-03)
      The availability and throughput of offshore oil and gas plants operating in the Arctic are adversely influenced by the harsh environmental conditions. One of the major challenges in quantifying such effects is lack of adequate life data. The data collected in normal-climate regions cannot effectively reflect the negative effects of harsh Arctic operating conditions on the reliability, availability, ...
    • Exploiting more robust and efficacious deep learning techniques for modeling wind power with speed 

      Chen, Hao; Staupe-Delgado, Reidar (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-11-27)
      Abstract Sound analyses of the nonlinear relationship between wind speed and power generation are crucial for the advancement of wind energy optimization. As an emerging artificial intelligence technology, deep learning has received growing attention from energy researchers for its outstanding ability to provide complex mappings. However, deep neural networks involve complex configurations, ...
    • Exploring alternative performance evaluation method in nautical simulations 

      Kim, Tae Eun; Munim, Ziaul Haque; Schramm, Hans-Joachim (Chapter; Bokkapittel, 2023)
      Performance assessment is fundamental for skill and competence development in professional education and training. This paper reviews the methods and metrics for performance assessment during maritime simulator-based education and training process, and creates an understanding regarding the current stage of knowledge and tools that could be used to systematically evaluate the student's learning ...
    • Factors influencing the time required to don thermal protective immersion suits correctly 

      Azizpour, Hooshyar; Galea, Edwin R.; Erland, Sveinung; Batalden, Bjørn-Morten; Deere, Steven; Oltedal, Helle Asgjerd (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-05-10)
      The cold environment in polar regions introduces additional challenges when abandoning passenger vessels and offshore facilities. The International Maritime Organization Polar Code requires vessels operating in polar regions to be equipped with approved thermal protective immersion suits (TPIS) that can be donned unassisted within 120 s. As time is critical during an evacuation, quantifying the Net ...
    • Failure intensity of offshore power plants under varying maintenance policies 

      Perera, Lokukaluge Prasad; Machado, Mario M.; Valland, Anders; Manguinho, Diego A.P. (Journal article; Peer reviewed; Tidsskriftartikkel, 2019-01-06)
      System reliability of an offshore power plant with several gas turbine engines is analyzed in this study to understand the failure intensity of a selected gas turbine engines under varying maintenance activities. A set of event data of a selected gas turbine engine is considered to identify system failure intensity levels, where unknown maintenance actions were implemented (i.e. various repairs ...
    • Finite element analysis of human femur bone 

      Mughal, Uzair; Khawaja, Hassan Abbas; Moatamedi, Mojtaba (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-08-04)
      An effort is made to analyse the stresses experienced by the human femur. In order to achieve these results a CAD model was developed by using the 3-D scanning of generic human femur for an individual of 70 kg weight (approx. averaged adult weight). The marrow cavity has been approximated as a hollow cylinder. The FEM model was built using solid tetrahedral element (20-noded 186 structural ...
    • Finnmark Platform Composite Tectono-Sedimentary Element, Barents Sea 

      Henriksen, Erik; Ktenas, Dimitrios; Nielsen, Jesper Kresten (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-12-16)
      The Finnmark Platform Composite Tectono-Sedimentary Element (CTSE), located in the southern Barents Sea, is a northward-dipping monoclinal structural unit. It covers most of the southern Norwegian Barents Sea where it borders the Norwegian mainland. Except for the different age of basement, the CTSE extends eastwards into the Kola Monocline on the Russian part of the Barents Sea. <p> <p>The general ...
    • Flystøy og luftforurensning ved flyplasser: Mulige helsekonsekvenser ved Oslo lufthavn 

      Krog, Norun Hjertager; Refsnes, Magne Arnold; Aasvang, Gunn Marit; Låg, Marit; Øvrevik, Johan (Research report; Forskningsrapport, 2017)
      Denne rapporten er skrevet på oppdrag fra Ullensaker kommune. Som vertskap for Norges hovedflyplass Oslo lufthavn (OSL) ønsket kommunen oppdatert vitenskapelig kunnskap om mulige virkninger på befolkningens helse og trivsel av de støynivåene man har i nærområdet til flyplassen. Kommunen ønsket også en vurdering av mulig luftforurensning ved flyplassen, og hva som kan være helsemessige konsekvenser ...
    • From East to East: Reconceptualization of NATO’s Eastern Flank Engagement in the Middle East 

      Bartoszewicz, Monika Gabriela; Pavlíčková, Kristýna (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-07-06)
      The role of the North Atlantic Treaty Organization and its influence on the peace and conflict dynamic in the Middle East has always been a discussed and controversial issue. While the United States and the countries of the NATO Southern flank are active in the discussions on NATO engagement in the region, the perspectives of NATO Eastern flank countries is often forgotten. This work contributes to ...
    • From European critical infrastructure protection to the resilience of European critical entities: what does it mean? 

      Pursiainen, Christer Henrik (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-10-03)
      The article is a public policy analysis of the development of legislation on critical infrastructure in the European Union (EU), covering 27 developed countries. More precisely, it concerns the 2022 CER Directive “on the resilience of critical entities’. This directive replaced the 2008 ECI Directive ‘on the identification and designation of European critical infrastructure and the assessment of ...
    • From Risk Management to Resilience Management in Critical Infrastructure 

      Rød, Bjarte; Lange, David; Theocharidou, Marianthi; Pursiainen, Christer Henrik (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-05-07)
      This article discusses critical infrastructure resilience in terms of how it could be incorporated into the existing safety and security practices, namely the ISO 31000 risk management standard. The article starts by outlining the resilience discourse, focusing on the organizational, technological, and societal domains of resilience. It goes on to present an approach to how the risk management ...
    • From Waste to Value: A Practical Framework for Waste Identification and Mitigation Using Lean Management Principles 

      Barabadi, Abbas; Nouri, Ali (Chapter; Bokkapittel, 2023)
      In the complex and fast-changing marketing environment, there is a constant need to reduce costs and enhance the performance of production systems. The cost-cutting strategies need to consider the long-term effect on the company. For example, the layoff may reduce the cost in the short term, but in the long term, it may significantly affect employees' psychological safety and increase human error. ...
    • Glacial ice impacts: Part II: Damage assessment and ice-structure interactions in accidental limit states (ALS) 

      Yu, Zhaolong; Lu, Wenjun; van den Berg, Marnix; Amdahl, Jørgen; Løset, Sveinung (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-10-28)
      Floating glacial ice features of various sizes pose a substantial threat to the structural integrity of offshore structures in ice-prone regions. Relatively small ice feathers, e.g., bergy bits and growlers, are a major concern because they are more difficult to detect by marine radars and perform concurrent ice management operations, especially in extreme sea states.<p> <p>This two-part companion ...
    • Global change research needs international collaboration 

      Büntgen, Ulf; Rees, William Gareth (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-08-04)
      Tackling the grand challenges of global climate change for the sustainability of ecological and societal systems requires data and expertise from Russia, the world's largest country that has the longest Arctic shoreline and the largest forest biome, peatland and permafrost zones. Academic relations and scientific collaborations with Russian scholars and institutions must continue despite the ensuing ...
    • A Goal Programming Approach for a Fuzzy Single-Source Capacitated Facility Location Problem 

      Shojaeibarjouei, Abolfazl; Barabadi, Abbas; Tavakkoli-Moghaddam, Reza (Journal article; Tidsskriftartikkel; Peer reviewed, 2019)
      In this paper, we present a new mixed-integer linear goal programming (MILGP) model for a fuzzy single-source capacitated facility location problem (F-SSCFLP), in which demands are considered as triangular fuzzy values and capacity of facilities are fuzzy constraints. At first, the basic fuzzy model for the given problem is presented. Then, utilizing goal programming (GP) approach and fuzzy principals ...
    • Group Based Asymmetry – A Fast Saliency Algorithm 

      Sharma, Puneet; Eiksund, Oddmar (Chapter; Bokkapittel, 2015-12-18)
      In this paper, we propose a saliency model that makes two major changes in a latest state-of-the-art model known as group based asymmetry. First, based on the properties of the dihedral group D4 we simplify the asymmetry calculations associated with the measurement of saliency. This results is an algorithm which reduces the number of calculations by at-least half that makes it the fastest among the ...