Now showing items 1-20 of 403

    • Local refinement of ERBS curves 

      Dalmo, Rune (Journal article; Peer reviewed; Chapter, 2013-12-31)
      Expo-rational B-splines (ERBS) provide a blending type construction where local functions at each knot are blended together by infinitely smooth basis functions. In this work we consider some specific ERBS curves that are approximations of parametric curves. We study local refinement to increase flexibility by inserting local control curves at points of interest on the ERBS curve. Inserting knots ...
    • A Co-Scheduling Problem of Ship Lift and Ship Lock at the Three Gorges Dam 

      Zhao, Xu; Lin, Qianjun; Yu, Hao (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-07-16)
      Due to the unprecedentedly increasing demands of waterway transportation on the Yangtze River during the latest years, traffic congestion at the Three Gorges Dam (TGD) has becoming a serious problem. In busiest seasons, a vessel may need to wait up to 3 days for passing the TGD via the ship lift or the five-stage ship lock. In order to improve the navigation efficiency and the utilization of passing ...
    • Parametric Sensitivity of CSTBRs for Lactobacillus casei: Normalized Sensitivity Analysis 

      Das, Subhashis; Calay, Rajnish K; Chowdhury, Ranjana (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-06-18)
      In this paper, a sensitivity analysis of a continuous stirred tank bioreactor (CSTBR) was conducted to determine a parametrically sensitive regime. The growth of a lactic acid bacterium, namely, <i>Lactobacillus casei</i>, in a pH-controlled CSTBR was considered as a process model. Normalized objective sensitivities of the minimum pH were determined with respect to input parameters. A generalized ...
    • Exploring benefits of using blending splines as transition curves 

      Brustad, Tanita Fossli; Dalmo, Rune (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-06-19)
      Track geometry is a fundamental subject in railway construction. With the demand for increased capacity in terms of load and speed, the need for suitable transitions between consecutive track sections is highly relevant. Properly constructed transition curves lead to improved travel comfort, increased safety, and reduced wear. The well known clothoid curve is widely used as a transition curve; ...
    • Product Inhibition of Biological Hydrogen Production in Batch Reactors 

      Das, Subhashis; Calay, Rajnish K; Chowdhury, Ranjana; Nath, kaustav; Eregno, Fasil (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-03-12)
      In this paper, the inhibitory effects of added hydrogen in reactor headspace on fermentative hydrogen production from acidogenesis of glucose by a bacterium, Clostridium acetobutylicum, was investigated experimentally in a batch reactor. It was observed that hydrogen itself became an acute inhibitor of hydrogen production if it accumulated excessively in the reactor headspace. A mathematical model ...
    • Multiphysics Analysis of CFRP Charpy Tests by varying Temperatures 

      Andleeb, Zahra; Strand, Cathrine Høgmo; Malik, Sohail; Hussain, G; Khawaja, Hassan; Boiger, Gernot; Moatamedi, Mojtaba (Journal article; Tidsskriftartikkel; Peer reviewed, 2020)
      Carbon Fiber Reinforced Polymer (CFRP) composites have emerged as a major class of structural materials that have a significant potential use as a substitute for metals in aerospace, marine, automotive, and architecture due to their higher-strength-to-weight-ratio. CFRP is well suited for various applications, but their mechanical properties such as ‘low-velocity impact resistance’ are not well ...
    • Design of an expandable junk catcher 

      Olsen, Kim A. (Master thesis; Mastergradsoppgave, 2017-06-15)
      "This report describes phase I of the project ""Design of an expandable junk catcher"", which is carried out on behalf of Qinterra Technologies, Department of Plugs & Packers in Narvik, as a part of the subject SHO6263 Diploma thesis M-ID. The main purpose of the project is to develop a new type of well intervention equipment to solve the problem of unwanted residue from debris on temporary installed ...
    • Fremtidens bygningsmaterialer 

      Gjerde, Klaus (Master thesis; Mastergradsoppgave, 2019-06-07)
      Bakgrunnen for oppgaven har vært å undersøke fremtidige bygningsmaterialer. Her er isolasjonsmaterialer og konstruksjonsmaterialer som betong, stål og massivtre gjennomgått. Det har i tillegg vært gjennomført et caseprosjekt hvor gjenbrukspotensialet for en bygning brukt i caseprosjektet har blitt vurdert. Videre ble livsløpsvurderinger for bygningen i caseprosjektet vurdert opp mot en tilsvarende ...
    • Transformation in manufacturer in the era of "Made in China 2025" 

      Li, Xuancheng (Master thesis; Mastergradsoppgave, 2019-06-07)
      China’s state council has unveiled a ten-year national plan, Made in China 2025, designed to transform China from a manufacturing giant into a world manufacturing power. Of all the projects includes in the “Made in China 2025” plan, intelligent and automated manufacturing is crucial. It is based on concepts i.e., internet of things, cloud computing, and big data. These technologies will be involved ...
    • Kontroll av FDVU-dokumentasjon og sammenheng med byggskader. Modell for kontroll av forvaltning-, drift-, og vedlikeholdsdokumentasjon i byggesaker, samt en vurdering av sammenheng mellom byggeskader og manglende eller ufullstendig FDVU-dokumentasjon 

      Alsen, Aleksander (Master thesis; Mastergradsoppgave, 2019-06-07)
      Missing or incomplete documentation for management, operation, and maintenance can become a problem in relation to both cost and quality. This thesis presents demands and responsible roles in given such documentation and uses the new standard SN/TS 3456:2018 Documentation for management, operations, maintenance and development (FDVU-documentation) to prepare a checklist/control-form for this ...
    • Engineering methods for enhancing railway geometry and winter road assessment: A safety and maintenance perspective 

      Brustad, Tanita Fossli (Doctoral thesis; Doktorgradsavhandling, 2020-06-22)
      In many areas around the world there are limited transportation possibilities when travelling between key cities. If these areas also experience demanding weather conditions or geography, getting from A to B, during difficult conditions, is usually not optimal in regards to accessibility, safety, and comfort. Under challenging conditions, two essential elements in strengthening accessibility, safety, ...
    • Development of Downhole Control Valve 

      Zakaria, Hassan (Master thesis; Mastergradsoppgave, 2018-05-31)
      Designing for downhole environment is a challenging process. High pressure and temperature are the main well conditions that effect the design decisions and the tool geometry. Also, the well fluids can obtain high concentration of corrosive content such H2S acid that plays major role in material selection. The intention of this study is to develop Downhole Control Valve that can be connected to ...
    • Some new contributions related to structural problems in engineering 

      Seger, Andreas (Doctoral thesis; Doktorgradsavhandling, 2020-06-17)
      <p>The studies in this PhD thesis are focused on some problems of general interest in applied mathematics and engineering sciences. A very broad view is used from contributions which can be directly used for solving some important structural problems in engineering sciences, to contributions which also are of interest in pure mathematics. The main body of the PhD thesis consists of five papers (papers ...
    • A study on hybrid sensor technology in winter road assessment 

      Pedersen, Aleksander; Brustad, Tanita Fossli (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-03-23)
      Road conditions during the winter months in Nordic countries can be highly unstable. Slippery roads combined with heavy haul traffic and ordinary road users can create dangerous, even lethal, situations if road maintenance is unsuccessful. Accidents and critical road conditions may lead to blocked roads, putting strain on a limited number of main roads in many regions, and may in the worst case ...
    • A Fuzzy-Stochastic Multi-Objective Model for Sustainable Planning of a Closed-Loop Supply Chain Considering Mixed Uncertainty and Network Flexibility 

      Yu, Hao; Solvang, Wei Deng (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-05-11)
      Closed-loop supply chain network design (CLSCND) has been increasingly spotlighted over the latest decade. The focus has been given to maximize the economic performance, resource utilization and sustainability through incorporating a holistic decision-making on both forward and reverse logistics. In this paper, a new fuzzy-stochastic multi-objective mathematical model is formulated for sustainable ...
    • Hardy-type inequalities over balls in R^N for some bilinear and iterated operators 

      Jain, Pankaj; Kanjilal, Saikat; Persson, Lars Erik (Journal article; Tidsskriftartikkel; Peer reviewed, 2019)
      Some new multidimensional Hardy-type inequalites are proved and discussed. The cases with bilinear and iterated operators are considered and some equivalence theorems are proved.
    • Preliminary studies on transition curve geometry: Reality and virtual reality 

      Brustad, Tanita Fossli (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-02-01)
      The topic of transition curves is well known in track and road engineering. Over the years the need for easement between straight and curved sections in railway and road design has grown, with an important reason being increase in vehicle speed. Testing of transitions is often done with graph analysis where the property of lateral change of acceleration is compared between varieties of curves. ...
    • Railway transition curves: A review of the state-of-the-art and future research 

      Brustad, Tanita Fossli; Dalmo, Rune (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-05-18)
      Transition curves are a useful tool for lateral alignment of railway segments. Their design is important to ensure safe and comfortable travel for passengers and cargo. Well designed transition curves can lead to reduced wear of tracks and vehicles, which is beneficial from a maintenance point of view. Extensive studies have been performed through decades to find transition curves that can replace ...
    • Development of a Model for the Estimation of the Energy Consumption Associated with the Transportation of CO2 in Pipelines 

      Jackson, Steven (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-05-12)
      All Carbon Capture and Storage (CCS) projects require the transportation of CO<sub>2</sub> from a source to a storage location. Although, a compressor and a large diameter pipeline is the normal method used to achieve this, liquefaction, shipping and pumping is sometimes attractive. Identifying the economic optimum is important for all CCS projects, minimizing energy consumption is also important ...
    • SOME NEW REFINEMENTS OF HARDY-TYPE INEQUALITIES 

      Oguntuase, J. A.; Fabelurin, Olanrewaju O; Persson, Lars Erik; Adeleke, EO (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-02-11)
      We obtain some further refinements of Hardy-type inequalities via superqudraticity technique. Our results both unify and further generalize several results on refinements of Hardy-type inequalities in the literature.