Now showing items 17285-17304 of 22814

    • R/V Gunnerus Digital Twin Infrastructure 

      Alvsaker, Johan Fredrik (Master thesis, 2020)
      Denne rapporten undersøker potensialet for bruk av digitale tvillinger i utdannings-øyemed for ingeniørstudenter gjennom NTNUs forskningsfartøy FF Gunnerus. Samtidig som digitale tvillinger blir mer og mer relevant for å ...
    • R744 ejector technology future perspectives 

      Hafner, Armin; Banasiak, Krzysztof (Journal article; Peer reviewed, 2016)
      Carbon Dioxide, CO2 (R744) was one of the first commonly applied working fluids in the infancy of refrigeration more than 100 years ago. In contrast to ammonia it mainly disappeared after the first generation of synthetic ...
    • R744 heat pump solutions for electric vehicles 

      Piesch, Nina; Niroomand, Reza; Hafner, Armin; Banasiak, Krzysztof; Ayad, Fadil (Chapter, 2023)
    • R744 HVAC unit for NSB Flirt trains 

      Trygstad, Eirik (Master thesis, 2017)
      The vast majority of current air conditioning systems, for railway HVAC applications, utilize high global warming potential (GWP) hydrofluorocarbon (HFC) refrigerants in a vapor compression cycle. In Europe, the dominating ...
    • R744 Refrigeration Solution for Small Supermarkets 

      Singh, Simarpreet; Pardiñas, Ángel Á.; Hafner, Armin; Schlemminger, Christian; Banasiak, Krzysztof (Chapter, 2021)
      Application based technology solution is nowadays preferred to achieve the performance of the cooling system configuration at its best. Therefore, benchmarking is an essential criterion which would add value to the optimum ...
    • Radial Consolidation of Pore Pressure Induced by Pile Driving 

      Bergset, Knut-Helge (Master thesis, 2015)
      Pile installation is recognized to significantly disturb the surrounding clay and cause changes in total and effective stresses around the pile. In this thesis, a numerical model is used to simulate pile installation and ...
    • Radial consolidation of pore pressure induced by pile installation 

      Olaussen, Anne Mestvedt (Master thesis, 2016)
      The soil surrounding a driven pile is subjected to varying degrees of soil disturbance during the installation, and experiences a complex combination of loading, unloading and reloading in the course of the life cycle of ...
    • Radiation therapy and training effects on the mechanical performance of bone 

      Auestad, Martin Fridheim (Master thesis, 2021)
      Med stadig stigende forventet levealder oppstår nye aldersrelaterte utfordringer. Eksponering for både osteoporotiske brudd og kreft øker med alder, og flere tilfeller oppdages siden ny teknologi for medisinsk undersøkelse ...
    • Radiative forcing bias of simulated surface albedo modifications linked to forest cover changes at northern latitudes 

      Bright, Ryan M.; Myhre, Gunnar; Astrup, Rasmus Andreas; Antón-Fernández, Clara; Strømman, Anders Hammer (Journal article; Peer reviewed, 2015)
      In the presence of snow, the bias in the prediction of surface albedo by many climate models remains difficult to correct due to the difficulties of separating the albedo parameterizations from those describing snow and ...
    • Radiative forcing geoengineering causes higher risk of wildfires and permafrost thawing over the Arctic regions 

      Müller, Rhonda C.; Kim, Jin-Soo; Lee, Hanna; Muri, Helene; Tjiputra, Jerry; Yoon, Jin-Ho; Schaepman-Strub, Gabriela (Journal article; Peer reviewed, 2024)
      Radiative forcing geoengineering is discussed as an intermediate solution to partially offset greenhouse gas-driven warming by altering the Earth’s energy budget. Here we use an Earth System Model to analyse the response ...
    • Radio frequency measurements and capacity analysis for industrial indoor environments 

      Ai, Yun; Cheffena, Michael; Li, Qihao (Chapter, 2015)
      In this study, path-loss and shadowing measurement results for three different industrial indoor environments at 900, 1600, and 2450 MHz are presented. The results show that the one-slope model fits the measured path-loss ...
    • Radio Propagation Measurements in the Indoor Stairwell Environment at 3.5 and 28 GHz for 5G Wireless Networks 

      Al-Samman, Ahmed; Mohamed, Marshed Kassim; Cheffena, Michael (Journal article; Peer reviewed, 2020)
      To cover the high demand for wireless data services for different applications in the wireless networks, different frequency bands below 6 GHz and in millimeter-wave (mm-Wave) above 24 GHz are proposed for the fifth ...
    • Radon barriers: A state-of-the-art review and future opportunities 

      Molin, Erik Alexander; Mørch, Maria Elisabeth (Bachelor thesis, 2023)
      Forskjellige løsninger for radonsperrer har blitt sammenlignet og studert. Kommersielle radonsperrer og andre materialer har blitt satt opp mot hverandre for å vise hvilke av de som kan være velfungerende barrierer. De ...
    • Radon barriers: A state-of-the-art review and future opportunities 

      Mørch, Maria Elisabeth; Molin, Erik Alexsander (Bachelor thesis, 2023)
      Forskjellige løsninger for radonsperrer har blitt sammenlignet og studert. Kommersielle radonsperrer og andre materialer har blitt satt opp mot hverandre for å vise hvilke av de som kan være velfungerende barrierer. De ...
    • RailCheck: A WSN-Based System for Condition Monitoring of Railway Infrastructure 

      Sramota, Jan; Skavhaug, Amund (Chapter, 2018)
      Contemporary tools used to monitor railway points and crossings are ineffective. Routine inspections of these critical parts are still being performed manually by specially-trained inspectors. This creates higher expenditure ...
    • RailCheck: A WSN-Based System for Condition Monitoring of Railway Infrastructure 

      Sramota, Jan; Skavhaug, Amund (Chapter, 2018)
      Contemporary tools used to monitor railway points and crossings are ineffective. Routine inspections of these critical parts are still being performed manually by specially-trained inspectors. This creates higher expenditure ...
    • RailCheck: Functional Safety for Wireless Condition Monitoring of Railway Turnouts and Level Crossings 

      Sramota, Jan; Lundteigen, Mary Ann; Petersen, Stig; Skavhaug, Amund (Chapter, 2019)
      Increasing demands for more cost-effective, reliable and safer railway infrastructure unavoidably bring up the need for transitioning from current preventive maintenance strategies to more efficient, predictive, condition-based ...
    • Railway Ballast Characteristics, Selection Criteria and Performance 

      Nålsund, Roar (Doktoravhandlinger ved NTNU, 1503-8181; 2014:259, Doctoral thesis, 2014)
      This work is a comprehensive investigation to find to what extent simple laboratory tests e.g. Los Angeles abrasion and micro-Deval might be suitable for predicting real railway ballast performance with respect to deformation ...
    • Railway ballast stabilising agents: Comparison of mechanical properties 

      Barbieri, Diego Maria; Tangerås, Marius; Kassa, Elias; Hoff, Inge; Liu, Zhuangzhuang; Wang, Fusong (Peer reviewed; Journal article, 2020)
      Expensive and time-consuming maintenance operations are routinely performed to preserve the ballast mechanical properties in railway lines. Binding agents are used for ballast stabilisation. Four different additives based ...
    • Railway bridge damage detection using vehicle-based inertial measurements and apparent profile 

      Quirke, Paraic; Bowe, Cathal; OBrien, Eugene J; Cantero, Daniel; Antolin, Pablo; Goicolea, Jose Maria (Journal article; Peer reviewed, 2017)
      The presence of damage in a railway bridge alters its stiffness and consequently, its static and dynamic response to loading. The dynamic response of a railway bridge to loading produces a dynamic response in the passing ...