Now showing items 689-708 of 919

    • Review of marine icing and anti-/de-icing systems 

      Rashid, Taimur; Khawaja, Hassan Abbas; Edvardsen, Kåre (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-08-17)
      The aim of this work is to review the phenomenon of icing in marine operations. The focus is on two main sources of icing, namely atmospheric and sea spray. The literature reveals that sea spray icing is the main contributor to marine icing. This work discusses the available ice accretion prediction models on ships and offshore structures. It also reviews the anti-/de-icing technologies that can be ...
    • A Review of Power Converters for Ships Electrification 

      Al-Sallami, Hussein Mahdi Yaseen; Hoff, Bjarte; Østrem, Trond (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-12-07)
      Fully electric ships have become popular to meet the demand for emission-free transportation and improve ships' functionality, reliability, and efficiency. Previous studies reviewed the shipboard power systems, the different types of shipboard energy storage devices, and the influences of the shore-to-ship connection on ports' electrical grid. However, the converter topologies used in the electrification ...
    • A Review on Emerging Cementitious Materials, Reactivity Evaluation and Treatment Methods 

      Jhatial, Ashfaque Ahmed; Novakova, Iveta; Gjerløw, Eirik (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-02-05)
      Alternative to traditional concrete, sustainable concrete reduces cement content, waste management issues, and CO2 emissions. To achieve sustainable concrete, waste materials can be used as supplementary cementitious materials (SCMs) to partially replace cement. Fly ash, ground-granulated blast furnace slag, and silica fume have been heavily studied as SCMs. However, due to the retirement of coal-fired ...
    • Review on material and design of anode for microbial fuel cell 

      Banerjee, Aritro; Calay, Rajnish K; Mustafa, Mohamad (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-03-21)
      Microbial Fuel Cell (MFC) is a bio-electrochemical system that generates electricity by anaerobic oxidation of substrates. An anode is the most critical component because the primary conversion of wastewater into electrons and protons takes place on the surface of the anode, where a biofilm is formed. This paper describes the essential properties of the anode and classifies its types according ...
    • Roach Infestation Optimization MPPT Algorithm for Solar Photovoltaic System 

      Calay, Rajnish K; Pradhan, Chittaranjan; Senapati, Manoj Kumar; Ntiakoh, Nicholas Kakra (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-03-16)
      Solar photovoltaic (PV) power has several advantages such as free availability, absence of rotating parts, can be easily integrated with building architecture, and need little maintenance. However, the PV cell current–voltage (I–V) characteristics are non-linear and power generated from a PV array depends on solar insolation/irradiation and panel temperature. The extracted PV output power is ...
    • Roach Infestation Optimization MPPT Algorithm of PV Systems for Adaptive to Fast-Changing Irradiation and Partial Shading Conditions 

      Ntiakoh, Nicholas Kakra (Master thesis; Mastergradsoppgave, 2021-05-18)
      Of all the renewable energy sources, solar photovoltaic (PV) power is considered to be a popular source owing to several advantages such as its free availability, absence of rotating parts, integration to building such as roof tops and less maintenance cost. The nonlinear current–voltage (I–V) characteristics and power generated from a PV array primarily depends on solar insolation/irradiation and ...
    • Role and Important Properties of a Membrane with Its Recent Advancement in a Microbial Fuel Cell 

      Banerjee, Aritro; Calay, Rajnish Kaur; Eregno, Fasil Ejigu (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-01-09)
      Microbial fuel cells (MFC) are an emerging technology for wastewater treatment that utilizes the metabolism of microorganisms to generate electricity from the organic matter present in water directly. The principle of MFC is the same as hydrogen fuel cell and has three main components (i.e., anode, cathode, and proton exchange membrane). The membrane separates the anode and cathode chambers and ...
    • Running out of excuses? Norwegian political and policy discourses justifying oil and gas development in the Arctic 

      Ballo, Bjørn Moen; Kristoffersen, Berit; Sidortsov, Roman (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-02-08)
      In this article, we analyse how energy security are woven into political discourses among Norwegian policymakers after the Russian invasion of Ukraine and the consequences of this for intergenerational justice and environmental concerns more broadly. Preceding justifications centred on state revenue and domestic economic growth, the current discourse focuses on the European need for security of ...
    • Samarbeid for selvbevisste 

      Måløy, Marthe (Chronicle; Kronikk, 2016-08-25)
    • Same same, but different – or how construction informatics gets taught at universities in Norway and Sweden 

      Merschbrock, Christoph; Onstein, Erling; Danielsen, Peter E.; Johansson, Peter (Chapter; Bokkapittel, 2023)
      In response to the increasing demand for construction informatics (CI) expertise, universities in the Nordic countries have developed new educational offers. This study explores how CI related education is being delivered by three different universities, two in Norway and one in Sweden. By comparing curricula and interviewing CI teachers, this paper contributes to the recent debate on the international ...
    • 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 ...
    • Scenario-based approaches for handling uncertainty in MPC for power system frequency control 

      Ersdal, Anne Mai; Imsland, Lars Struen (Journal article; Peer reviewed; Tidsskriftartikkel, 2017)
      A stochastic nonlinear model predictive controller (SNMPC) is designed for automatic generator control of a proxy of the Nordic power system, and it is compared with a multi-stage nonlinear model predictive controller (MNMPC). Both controllers are scenario based, but originate in two different disturbance modeling paradigms; stochastic and deterministic. A simulation study indicates that the two ...
    • Science and Mathematics as part of practical projects in technology and design: An analysis of challenges in realising the curriculum in Norwegian schools 

      Bungum, Berit; Esjeholm, Bjørn-Tore; Lysne, Dag Atle (Journal article; Peer reviewed; Tidsskriftartikkel, 2014)
      Technology and design is seen by many as having a potential for students to work with science and mathematics in practical contexts. The view is particularly evident in the Norwegian curriculum, where technology and design is defined as an interdisciplinary topic involving Science, Mathematics and Art & Crafts. This paper reports from a video study of the use of mathematics and science in student ...
    • Seasonal storage of energy at UiT the arctic university of Norway in Narvik 

      Alfnes, Dennis (Master thesis; Mastergradsoppgave, 2023-05-22)
      The thesis examines which energy production methods are suitable together with seasonal storage of energy at UiT the arctic university of Norway in Narvik. Nordkraft has provided the subject which has been examined. The location of UiT Narvik together with its areas and storage volumes have been examined for what power production methods and energy storage methods are suitable for this location. ...
    • Secondary Network Throughput Optimization of NOMA Cognitive Radio Networks Under Power and Secure Constraints 

      Vo, Van Nhan; Viet Hung, Dang; Tran, Hung; Ha, Dac-Binh; Le, Cong; Ho, Tu Dac; Chakchai, So-In (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-31)
      Recently, the combination of cognitive radio networks with the nonorthogonal multiple access (NOMA) approach has emerged as a viable option for not only improving spectrum usage but also supporting large numbers of wireless communication connections. However, cognitive NOMA networks are unstable and vulnerable because multiple devices operate on the same frequency band. To overcome this drawback, ...
    • Security Constrained Unit Commitment and Economic Dispatch applied to the Modified IEEE 39-bus system Case 

      Tricarico, Gioacchino; Azuara-Grande, Luis Santiago; Wagle, Raju; Gonzalez-Longatt, Francisco; Dicorato, Maria; Forte, Giuseppe; Rueda, Jose Luis (Journal article; Tidsskriftartikkel, 2022-12-09)
      The operation schedule of the power generation units in electrical power systems is determined by the optimisation problem known as unit commitment (UC), aiming at minimising the total cost considering the generation constraints. To obtain a feasible solution from the network perspective, the security-constrained UC (SCUC) problem has been defined to embed the network constraints in the optimisation ...
    • Security Constrained Unit Commitment and Economic Dispatch by AC Sensitivity Factors 

      Tricarico, Gioacchino; Wagle, Raju; Azuara-Grande, Luis Santiago; Gonzalez-Longatt, Francisco; Dicorato, Maria; Forte, Giuseppe; Rueda, Jose Luis (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-11-09)
      The dispatch schedule of the electrical power plant units is the result of the solution to the unit commitment optimisation problem, and it minimises the cost of production considering pre-defined technical limits. The security-constrained unit commitment problem has been defined as including the network constraints in the previously mentioned optimisation problem to obtain a feasible power system ...
    • Selvuttørkingsevne og kondensfare for yttervegger i passivhus 

      Johansen, Øyvind Vollnes (Master thesis; Mastergradsoppgave, 2016-11-03)
      Etterspørselen av bygg som er oppført etter passivhusstandard øker i Norge, men det er til nå ikke blitt forsket mye på hvordan disse veggene, bygd etter passivhusstandard, vil oppføre seg i norsk klima. Det er blitt undersøkt ytterveggens evne til selvutørking og eventuell kondensfare som kan oppstå, som følge av lokalisering i ulike klimasoner og i forhold til himmelretning. Resultatene fra ...
    • Semi-Implicit Method for Pressure-Linked Equations (SIMPLE) – solution in MATLAB® 

      Khawaja, Hassan; Moatamedi, Mojtaba (Journal article; Tidsskriftartikkel; Peer reviewed, 2018)
      This work presents a method for the solution of fundamental governing equations of computational fluid dynamics (CFD) using the Semi-Implicit Method for Pressure-Linked Equations (SIMPLE) in MATLAB®. The fundamental governing equations of fluid mechanics are based on three laws of conservation, referred to as the law of conservation of mass, the law of conservation of momentum and the law of ...
    • Sensitivity Analysis and Case Studies for CO2 Transportation Energy Consumption 

      Jackson, Steven (Journal article; Tidsskriftartikkel; Peer reviewed, 2020)
      The transportation of CO2 is important to all Carbon Capture and Storage (CCS) projects. Both the infrastructure costs – compressors, pipelines, tanker ships, etc. – and the energy consumed in the compression or liquefaction of CO2 are significant. Understanding how the size, capacity and energy consumption of transportation alternatives varies between projects is therefore important. Modelling ...