Viser treff 817-836 av 915

    • Tailored Iterated Greedy metaheuristic for a scheduling problem in metal 3D printing 

      Ying, Kuo-Ching; Pourhejazy, Pourya; Huang, Ya-Hsuan (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-09-24)
      This article contributes to the additive manufacturing-based production planning literature by developing a Mixed-Integer Linear Programming (MILP) formulation for the Identical Parallel 3D-Printing Machines Scheduling Problem considering batching, multiple build platforms of restricted sizes, and sequence-independent setup times. Besides, a customized metaheuristic, named the Tailored Iterated ...
    • Take-Home Exams in University Mathematics and Science Subjects: Some Ethical Considerations 

      Rensaa, Ragnhild Johanne; Kristiansen, Raymond (Journal article; Tidsskriftartikkel; Peer reviewed, 2024)
      This article addresses some challenging perspectives related to offering take-home exams in mathematics at university level. The challenges arose during work on a previous article where four perspectives originating from Bjerrum Nielsen’s framework (2003) were used to analyze universities’ assessment methods during the Covid lockdown in our country. The perspectives had some ethical considerations ...
    • Technical Challenges and Solutions of a three-phase bidirectional two stage Electric Vehicle charger 

      Mughal, Babur Zaman Khan (Master thesis; Mastergradsoppgave, 2022-05-15)
      The sustainability of the power grid owing to the building strain of the ever-growing demand for electrical energy urges innovative and more practical solutions that enable active participation of end-users in stable and reliable management of power systems. One of the emerging projections of such a two-way exchange of electrical power between the grid and consumers is the developing field of ...
    • A Techno-economic Study of a Biomass Gasification Plant for the Production of Transport Biofuel for Small Communities 

      Mustafa, Albara Mohamad Yazid Faisal; Calay, Rajnish K; Mustafa, Mohamad (Journal article; Peer reviewed; Tidsskriftartikkel, 2017-03-30)
      A techno-economic feasibility study of liquid bio-fuel production from biomass to meet the demand for public transport in small communities is presented. The methodology adopted in this work is based on calculating the demand of fuels required by transport sector and then estimating the amount of available biomass from various sources which can be treated to produce biofuels to meet the demand ...
    • Technology Modules Providing Solutions for Agile Manufacturing 

      Deniša, Miha; Ude, Aleš; Simonič, Mihael; Kaarlela, Tero; Pitkäaho, Tomi; Pieskä, Sakari; Arents, Janis; Judvaitis, Janis; Ozols, Kaspars; Raj, Levente; Czmerk, András; Dianatfar, Morteza; Latokartano, Jyrki; Schmidt, Patrick Alexander; Mauersberger, Anton; Singer, Adrian; Arnarson, Halldor; Shu, Beibei; Dimosthenopoulos, Dimosthenis; Karagiannis, Panagiotis; Ahonen, Teemu-Pekka; Valjus, Veikko; Lanz, Minna (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-09-01)
      : In this paper, we address the most pressing challenges faced by the manufacturing sector, particularly the manufacturing of small and medium-sized enterprises (SMEs), where the transition towards high-mix low-volume production and the availability of cost-effective solutions are crucial. To overcome these challenges, this paper presents 14 innovative solutions that can be utilized to support ...
    • Teknisk analyse av et ny bygget sykehjem i 2021 etter passivhus standard. Dokumentasjon av funn etter stikkprøvekontroll av FDV 

      Xu, Xin (Master thesis; Mastergradsoppgave, 2022-05-24)
      SAMMENDRAG Da det skulle bygges nytt sykehjem på Åse i Andøy kommune ble det besluttet at det skulle bygges etter passivhus standarden som stiller strenge krav til utførelse og dokumentasjon. Hensikten med denne oppgaven er å gjennomføre en teknisk analyse bygget og innebærer å undersøke om bygget er oppført etter oppgitt kravspesifikasjon i anbudet og kontrollere FDV-dokumentasjon etter forskrifter ...
    • Temporary Load Shedding - Optimization of power distribution system using load shedding Techniques 

      Basit, Abdul (Master thesis; Mastergradsoppgave, 2022-05-15)
      In today’s world, electrical energy is a necessity. The dependency on electricity is increasing day by day which caused the system to work under a stress state close to stability limits and disturbances. An efficient power system supplying electrical energy must be reliable, stable, secure, and reasonable to meet consumer needs. The power demand depends on several factors and weather is one of the ...
    • Tethered Quadcopter Control, Simulation and Modeling platform for a small USV 

      Wæringsaasen, Sindre (Master thesis; Mastergradsoppgave, 2021-05-18)
      Maritime Robotics main intent of the thesis is to develop understanding of a small deployable camera platform capable of providing elevated situational awareness for a small USV using a tether. The thesis goes into the state-ofthe-art methods of usage and control of a tethered drone. The thesis goes into the building and operating of the QAV250 Pixhawk 4 mini drone and making a drone simulation ...
    • Thaw Penetration in Frozen Ground Subjected to Hydronic Heating 

      Sveen, Svein Erik; Nguyen, Hung Thanh; Sørensen, Bjørn Reidar (Peer reviewed; Journal article; Tidsskriftsartikkel, 2016-09-22)
      To facilitate excavation and foundation work in seasonally freezing or permafrost regions, the frozen soil must be thawed, either by natural (solar) thawing, or by artificial thawing where an auxiliary heat source is utilized to accelerate the process. In this paper, the process of rapid thawing of frozen ground subject to hydronic heating is studied. In particular, the performance characteristics ...
    • Themes within lecturers' views on the teaching of linear algebra 

      Rensaa, Ragnhild Johanne; Hogstad, Ninni Marie; Monaghan, John David (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-09-25)
      This paper reports on themes that arose in an investigation of university lecturers’ views on the teaching of linear algebra. This focus on themes was the initial part of a study concentrating on four areas: What is important to teach in a first course in linear algebra? Are there teaching methods which are particularly suited for such a course? Are there tools that should/should not be used; and ...
    • Thermal Properties of SK One Component Polyurethane using Experiments and Multiphysics Simulations 

      Ahmad, Tanveer; Xue, Hui; Khawaja, Hassan Abbas; Sun, Zhiheng; Linmei, Nie; Moatamedi, Mojtaba (Conference object; Konferansebidrag, 2016-12-08)
      This study proposes to determine the thermal conductivity of SK One Component Polyurethane (SKOCP) developed by China Institute of Water Resources & Hydropower Research Beijing IWHR-KHL Co. Ltd. SKOCP provides excellent proof of aging and chemical resistance of this material. It is non-toxic, acts as a good anti-seepage, offers anti-abrasion and good anti-freezing performance. In addition, it has ...
    • Thermoelastic Investigation of Carbon-Fiber Reinforced Composites using Drop Weight Impact Test 

      Andleeb, Zahra; Malik, Sohail; Khawaja, Hassan; Nordli, Anders Samuelsen; Antonsen, Ståle; Hussain, Ghulam; Moatamedi, Mojtaba (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-12-28)
      Composite materials are becoming more popular in technological applications due to the significant weight savings and strength these materials offer compared to metallic materials. In many of these practical situations, the structures suffer from drop impact loads. Materials and structures significantly change their behavior when submitted to impact loading conditions as compared to quasi-static ...
    • Thin Wall Structure by Welding 

      Arumairasa, Hans Ivar (Master thesis; Mastergradsoppgave, 2019-06-28)
      Manufacturing of thin wall structure by wire arc additive manufacturing (WAAM) is on the main application of additive manufacturing. 3D-printing technology has significant advantages over traditional milling and machining techniques or welded analogs. Thin wall structure constitutes an essential and growing proportion of engineering construction, within common areas as in structural aerospace and ...
    • Three-phase separator simulator 

      Myrstad, Mats (Master thesis; Mastergradsoppgave, 2022-05-16)
      In this thesis, the goal is to compare the UIT model in the energy lab to the simulation program Aspen HYSYS. The model in the lab has consist of a three-phase separator tank with a weir, and two-component of water and cooking oil, It was made by two students at UIT in 2018. In this simulation, there will be three different variables to determine the accuracy of the simulation. The flow in and out, ...
    • Throughput Optimization for NOMA Energy Harvesting Cognitive Radio with Multi-UAV-Assisted Relaying under Security Constraints 

      Dang, Viet-Hung; Nguyen, Le-Mai-Duyen; Vo, Van Nhan; Tran, Hung; Ho, Tu Dac; Chakchai, So-In; Surasak, Sanguanpong (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-11-28)
      This paper investigates the throughput of a non-orthogonal multiple access (NOMA)-based cognitive radio (CR) system with multiple unmanned aerial vehicle (UAV)-assisted relays under system performance and security constraints. We propose a communication protocol that includes an energy harvesting (EH) phase and multiple communication phases. In the EH phase, the multiple UAV relays (URs) harvest ...
    • Thyristor based short circuit current injection in isolated grids 

      Hoff, Bjarte; Sharma, Pawan; Østrem, Trond (Peer reviewed; Bokkapittel; Chapter, 2017-02-16)
      This paper proposes a thyristor based short circuit current injector for providing short circuit current in isolated and weak grids, where sufficient fault current to trigger circuit breakers may not be available. This will allow the use of conventional miniature circuit breakers, which requires high fault current for instantaneous tripping. The method has been validated through experiments.
    • Time scale Hardy-type inequalities with ‘broken’ exponent p 

      Oguntuase, James A; Fabelurin, Olanrewaju O; Adeagbo-Sheikh, Abdulaziz G; Persson, Lars Erik (Peer reviewed; Journal article; Tidsskriftsartikkel, 2015-01-16)
      In this paper, some new Hardy-type inequalities involving ?broken? exponents are derived on arbitrary time scales. Our approach uses both convexity and superquadracity arguments, and the results obtained generalize, complement and provide refinements of some known results in literature
    • Time Series Forecasting of Reactive Power Support from Smart Converters in SDN Using Machine Learning 

      Aziz, Mujtaba (Master thesis; Mastergradsoppgave, 2023-05-19)
      The climate changes in the last few years created a major need to integrate more renewable energy sources and other low-carbon technologies into the power system network. This causes to face more changes in the power system network, which are particularly visible in distribution power networks. A higher penetration of the distributed energy resources, installed at low- voltage and or medium-voltage ...
    • To Measure Relative Permittivity of Atmospheric Ice Using Frequency Sweep 

      Mughal, Umair Najeeb; Shu, Beibei (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-10-31)
      The use of AD59333 IC for detecting atmospheric ice and atmospheric ice type was evaluated in this article. A prototype circuit was developed and was tested using a frequency sweep from 40 Hz to 20 kHz. The IC was calibrated using 100 kΩ resistor. The real and imaginary components of discrete Fourier transform were recorded at each frequency increment in order calculate the gain factor at each ...
    • Topological Singularities in Periodic Media: Ginzburg–Landau and Core-Radius Approaches 

      Alicandro, Roberto; Braides, Andrea; Cicalese, Marco; De Luca, Lucia; Piatnitski, Andrey (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-12-20)
      We describe the emergence of topological singularities in periodic media within the Ginzburg–Landau model and the core-radius approach. The energy functionals of both models are denoted by Eε,δ, where ε represent the coherence length (in the Ginzburg–Landau model) or the core-radius size (in the core-radius approach) and δ denotes the periodicity scale. We carry out the -convergence analysis ...