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  • 1.
    Bjälke, Victor
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Structural mechanics and resistance of concrete structures in the event of a hydrogen explosion in nuclear powerplants2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This thesis deals with the problem of hydrogen explosions in nuclear power plants, and evaluates if the reactor hall is to be seen as a safety barrier for such events. Today, the reactor hall is not seen as a safety barrier that is able to withstand an internal explosion. In the analysis Abaqus was used for the FEM calculations, where a main scenario of a wall subjected to a hydrogen explosion was used.

    In conclusion, the results showed that a reactor hall with the assumed dimensions cannot be seen as a safety barrier, since the deformation after a hydrogen explosion near the LEL was too great.

    However, it is also concluded that with increased wall and rebar dimensions it is possible to construct a wall of this kind that fulfills the requirements of a safety barrier.

  • 2.
    Guldevall, Peter
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Space Technology.
    Development of an FPGA based Trigger for Slow Moving Events for the EUSO-TA Telescope2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
  • 3.
    Gustafson, Anna
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Jonsson, Kristina
    LKAB.
    Johansson, Daniel
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Schunnesson, Håkan
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    From Face to Surface: a Fragmentation Study2016In: Seventh International Conference & Exhibition on Mass Mining : (MassMin 2016), Sydney: The Australian Institute of Mining and Metallurgy , 2016, p. 555-562Conference paper (Refereed)
    Abstract [en]

    The underground mining process, from in-situ characteristics of the unmined rock mass to the final mill product with fully liberated minerals, consists of a chain of unit operations. Some of them influence fragmentation while fragmentation impacts others. From a production point of view, fragmentation is a key parameter for the proper functioning of many unit operations and affects total production; it influences the ability to load, haul and crush the rock later in the process. Fragmentation varies because of rock mass strength, the presence of joints, the chosen explosive, specific charge (kg/m3) and quality of drill holes. The efficiency and result of unit operations such as drilling, blasting, loading and crushing depend on the rock properties which vary throughout a mine. Generally speaking, operations are not well adapted to the actual rock properties, leading to a non-optimised flow in production. This paper presents the initial part of a project that will build knowledge on the impact of fragmentation on each step of the production chain in an underground mine. It identifies the key parameters of fragmentation which influence the overall energy consumption and productivity in a mining operation through interviews, mine visits and a literature review. In the subsequent stages of the project, a number of field tests in the case study mine will address important segments of the production process where fragmentation is a major obstacle to improvements. Optimising the entire process, rather than isolated unit operations, will lead to increased productivity, decreased amount of interruptions and lower energy consumption.

     

  • 4.
    Lönnqvist, Joel
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Blecken, Godecke-Tobias
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Viklander, Maria
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Plant cover and species compositions on subarctic green roofs2017In: 14th IWA/IAHR International Conference on Urban Drainage in Prague, Czech Republic 10-15 September 2017, 2017Conference paper (Other academic)
    Abstract [en]

    Thisstudy looked at the plant cover and species composition of green roofs in a subarctic climate. The study’s aim was to evaluate the cover of plants and moss on green roofs in northern Sweden. Data was gathered from a field survey in summer 2016 andevaluatedroof sections located on buildings in three different towns located on a latitudinal gradient.Apart from plant cover substrate depth, slope andexposure was recorded. The results showed that the average vascular plant cover was low in the two northern locations (32% and 27%) while in the southernmost location it was high (>85%).

  • 5.
    Migdalas, Athanasios
    et al.
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Business Administration and Industrial Engineering.
    Pardalos, Panos
    A Note on Open Problems and Challenges in Optimization Theory and Algorithms2018In: Open Problems in Optimization and Data Analysis / [ed] Panos M. Pardalos, Springer Publishing Company, 2018, p. 1-8Chapter in book (Refereed)
    Abstract [en]

    Computational and theoretical open problems in optimization, computational geometry, data science, logistics, statistics, supply chain modeling, and data analysis are examined in this book.  Each contribution provides the fundamentals  needed to fully comprehend the impact of individual problems. Current theoretical, algorithmic, and practical methods used to circumvent each problem are provided to stimulate a new effort towards innovative and efficient solutions. Aimed towards graduate students and researchers in mathematics, optimization, operations research, quantitative logistics, data analysis, and statistics, this book provides a broad comprehensive approach to understanding the significance of specific challenging or open problems within each discipline.

  • 6. Pambou Nziengui, C.F
    et al.
    Turesson, Jonas
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Odounga, B
    Ekevad, Mats
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Moutou Pitti, R
    Dérermination des principales caractéristiques physiques et mécaniques du sapin blanc du massif central et de l'okoumé du Gabon.2018Conference paper (Refereed)
    Abstract [en]

    The following study, shows on the basis of a series of tests carried out on samples of White fir species of the central massif and okume of Gabon, a database of the different physical and mechanical properties of these species. The tests are carried out indoors at room temperature, on specimens sized according to the French standard [AFN 06]. These specimens, whose physical properties are previously determined, are loaded in 4-point static bending on an electrostatic press. Then, using standardized calculation methods, a determination of the main mechanical parameters of these species is made. The results of the various comparative analyzes carried out show that there are no significant differences  between the parameters highlighted in this study for these different species despite the  difference between their growth areas.

  • 7.
    Unée, Marcus
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences.
    På liv och död: En studie av björnungar på Lycksele djurpark2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
1 - 7 of 7
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