Recent additions

  • Droplet distribution spectrum effects on dry ice growth on cylinders 

    Sokolov, Pavlo; Virk, Muhammad (Journal article; Peer reviewed, 2019-01-06)
    A detailed parametric analytical study along with a series of viscid multiphase numerical simulations of ice accretion were performed in comparison with experimental data of ice accretion on a 30 mm diameter cylinder. The study was performed for droplet distribution spectra, Langmuir (A-J), in addition to an experimental droplet distribution obtained in an icing tunnel.<br>Analysis shows that droplet ...
  • Interpreting teaching for conceptual and for procedural knowledge in a teaching video about linear algebra 

    Rensaa, Ragnhild Johanne; Vos, Pauline (Journal article; Tidsskriftartikkel, 2018)
    The aim of this study is to investigate teaching videos about mathematics, seeking to uncover research-based foundations for their quality. By drawing on the notions of procedural and conceptual knowledge, the research was operationalized by asking professionals in undergraduate mathematics education (n=18) to interpret sections of a teaching video. The video dealt with a topic in linear algebra. ...
  • A comparative study of CO2 heat pump performance for combined space and hot water heating 

    Brodal, Eivind; Jackson, Steven (Journal article; Peer reviewed, 2019-08-20)
    Heat pumps used for combined space and hot water heating are often used in modern energy-efficient buildings. Performance depends on both system design (exchanger sizes, compressor efficiency, etc.) and operating conditions (inlet water temperature, ratio between space and water heating, etc.). Designs using both CO2 and HFCs, such as R410A, are available, but the relative performance of these is ...
  • Performance and Design Study of Optimized LNG Mixed Fluid Cascade Processes 

    Brodal, Eivind; Jackson, Steven; Eiksund, Oddmar (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-09-26)
    Mixed Fluid Cascade (MFC) processes are often claimed to be one of the most efficient methods to liquefy natural gas. Their performance depends on both operating conditions such as ambient temperature, and system design parameters such as exchanger sizes. The performance of the standard MFC process can be further improved by modifying the design with additional equipment, such as liquid refrigerant ...
  • Multiphysics Impact Analysis of Carbon Fiber Reinforced Polymer (CFRP) Shell 

    Strand, Cathrine Høgmo; Andleeb, Zahra; Khawaja, Hassan; Moatamedi, Mojtaba (Journal article; Peer reviewed, 2019-07-30)
    With increasing popularity of Carbon Fiber Reinforced Polymer (CFRP) over time, the need for research in the field has increased dramatically. Many industries, i.e. aeronautical, automotive, and marine are opting to install carbon fiber in their structures to account for harsh environments like cold temperatures applications, but the research on the temperature exposure behavior of the materials are ...
  • Digitalized manufacturing logistics in engineer-to-order operations 

    Strandhagen, Jo Wessel; Buer, Sven-Vegard; Semini, Marco; Alfnes, Erlend (Chapter; Bokkapittel, 2019)
    The high complexity in Engineer-To-Order (ETO) operations causes major challenges for manufacturing logistics, especially in complex ETO, i.e. one-of-a-kind production. Increased digitalization of manufacturing logistics processes and activities can facilitate more efficient coordination of the material and information flows for manufacturing operations in general. However, it is not clear how to ...
  • Some Fourier inequalities for orthogonal systems in Lorentz–Zygmund spaces 

    Akishev, Gabdolla; Persson, Lars Erik; Seger, Andreas (Journal article; Peer reviewed, 2019-06-13)
    A number of classical inequalities and convergence results related to Fourier coefficients with respect to unbounded orthogonal systems are generalized and complemented. All results are given in the case of Lorentz–Zygmund spaces.
  • Effekt av basaltfiber for betongkvalitet = Effect of basalt fiber for quality of concrete 

    Ha, Duy Quang (Master thesis; Mastergradsoppgave, 2019-06-27)
    The need of concrete is getting more and more, experts have researched new materials to improve the good properties of concrete. Basalt fiber is a new additive in the concrete industry, so researches on basalt fiber concrete is not many. Previous research results have shown positive effects of basalt fiber on the mechanical strengths of the concrete. This task is performed by experiments to confirm ...
  • Samspillskontrakter – en vei å forene ulike interesser 

    Nielsen, Håvard Johannes (Master thesis; Mastergradsoppgave, 2019-06-27)
    Samspill i norsk bygg- og anleggsbransje øker i omfang. Hensikten med samspillsmodellene er å sørge for mer innovasjon i byggeprosjekter, samtidig som modellen skal motivere til kostnadseffektive løsninger. Tema for denne oppgaven er hvordan samspill kan nyttiggjøres i byggeprosjekter, og hvilke utfordringer og fordeler samspill kan medføre for byggherre. Oppgaven tar også for seg karakteristiske ...
  • Evaluation of cascaded MPC performance in voltage source converters 

    Mokrushev, Ivan (Master thesis; Mastergradsoppgave, 2018-08-21)
    Model predictive control method becomes more popular in research over the last decade. Due to the growing popularity of the model predictive control concept, there are more and more questions about the effectiveness of this method in comparison with other methods. In this thesis cascaded model predictive control of grid connected voltage source converter with LCL filter has been evaluated. The ...
  • Study of area use and floor space occupation in office buildings using ML approach 

    Heidari, Fatemeh (Master thesis; Mastergradsoppgave, 2018-08-16)
    This thesis presents a general model to estimate the number of people at office spaces in the given time step. This project represents the description of the several approaches for similar problems, general description of statistical and machine learning models and applying those models for specific building. This work is also cover some suggested dashboards to keep track of space usage. The flowing ...
  • Transient analysis of road tunnel power system 

    Ivanova, Elizaveta (Master thesis; Mastergradsoppgave, 2018-08-16)
    The main tasks of Statens Vegvesen is to plan, build and maintain the roads of Norway. Tunnels are included as a part of this task. Due to expected changes in usage patterns and needs, the Norwegian authorities decided to adapt to the European model the design of low voltage networks. The backup power system is one of the most important parts of the installation and presents an independent source ...
  • Playing a video game is more than mere procrastination 

    Nordby, Kent; Løkken, Ronny Andre; Pfuhl, Gerit (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-06-13)
    <i>Background</i>: Procrastination is seen as a severe problem among young people, and many factors have been claimed to be associated with it, playing video games being one of them. One of the reasons why video games might be related to procrastination is their ability to offer instant gratification and feedback, while at the same time offer distractions from less tempting and rewarding tasks. ...
  • Multiphysics Study of Tensile Testing using Infrared thermography 

    Stange, Even; Andleeb, Zahra; Khawaja, Hassan; Moatamedi, Mojtaba (Journal article; Peer reviewed, 2019)
    In this work, the IR thermography was used to study the steel specimens (DIN 50125 Standard) undergoing the tensile tests. The tensile tests were performed using GUNT® Hamburg Universal Material Tester. The tensile specimens were clamped, and the test force was generated using a handoperated hydraulic system. A dial gauge measured the elongation of the specimens. Using the WP 300.20 system for data ...
  • Comparison of Explicit Method of Solution for CFD Euler Problems using MATLAB® and FORTRAN 77 

    Nordli, Anders Samuelsen; Khawaja, Hassan (Journal article; Peer reviewed, 2019)
    This work presents a comparison of an explicit method of solution for an inviscid compressible fluid mechanics problem using Euler equations for two-dimensional internal flows. The same algorithm was implemented in both FORTRAN 77 and MATLAB®. The algorithm includes Runge‒Kutta time marching scheme with smoothing. Both solvers were initialized in the same manner. In addition, it was ensured that ...
  • Spesifikke energiforsyningskonsepter i Smart Arctic Building 

    Li, Lin (Master thesis; Mastergradsoppgave, 2019-06-27)
    I oppgaven utredes det spesifikk energiforsyningskonsepter og energikombinasjoner som gir lavest energibruk. Oppgaven ser på to eldre lavboligblokker som ligger i Beisfjordveien 88 og 90, som eies av Ofoten Midt-Troms Boligbyggerlag. Bygget har i dag lite isolasjon, og elektrisk energiforsyning som medfører stort varmetap og høyt energiforbruk på ca. 216 kWh/m2. Rehabiliteringen av blokker omfatter ...
  • Effekt av Idrocrete KR 1000 på betongporestruktur og permeabilitet (Effect of Idrocrete WP 1000 on concrete pore structure and permeability) 

    Onyango Orony, Elvis (Master thesis; Mastergradsoppgave, 2019-06-27)
    This thesis includes a literature study where the focus is concrete theory and how additives affect the durability of the concrete. In addition, there will be a practical part where the largest part of the task will undergo mainly on the concrete laboratory. Two different mixtures will be mixed. A reference mixture (Ref.B35) and another mixtue with the same recipe, but this will contain an additive ...
  • Byggetekniske løsninger for kalde og arktiske strøk (Building design & solutions for cold and arctic environment) 

    Sara, Bernt Ailu Utsi; Blegeberg, Magnus Moland (Master thesis; Mastergradsoppgave, 2019-06-27)
    In recent years, there has been an increacing focus on environmental issues and the ongoing climate change. With predictions of increasing rainfall and more extreme weather, this poses a greater risk of damage to buildings, which again places stricter requirements on construction details. In Norway, there has been focus on construction in cold and arctic regions, and the impact on existing buildings ...
  • Kartlegging av inneklima på Skistua Barneskole (A study of the indoor climate at Skistua elementary school) 

    Lohne, Olav Nilsen; Thorrud, Lars (Master thesis; Mastergradsoppgave, 2019-06-27)
    The purpose of the measurements was to document whether the school had an acceptable indoor climate. An ''ørebro''-examination was performed as an indicator of which parameters might be appropriate to investigate. Using the survey, measurements of CO2, air temperature, PMV, relative humidity and airflow were made. The results that emerged showed that the school had a generally acceptable indoor ...
  • Bygningsfysiske utfordringer i forbindelse med kalde garasjeanlegg 

    Pettersen, Emil; Pettersen, Bjørn Anders (Master thesis; Mastergradsoppgave, 2019-06-26)
    "Årlig koster byggeskader samfunnet 17 milliarder, gjennom undersøkelser utført av SINTEF byggforsk er det konkludert med at 65-70 prosent av disse byggeskadene skyldes fukt (TU, 2017). Bygge skader som dette har resultert i at Plan og bygningsloven (PBL) og Direktoratet for byggkvalitet (DIBK) utarbeidet en ny forskrift som trådte i kraft pr. 1.1.2013 som ett tiltak på å redusere bygge skader. ...

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