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  • Ishikawa, Kunio
    et al.
    Department of Biomaterials, Faculty of Dental Science, Kyushu University, Maidashi, Higashi-Ku, Fukuoka, Japan.
    Garskaite, Edita
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering. Institute of Chemistry, Vilnius University, Vilnius, Lithuania.
    Kareiva, Aivaras
    Institute of Chemistry, Vilnius University, Vilnius, Lithuania.
    Sol–gel synthesis of calcium phosphate-based biomaterials: A review of environmentally benign, simple, and effective synthesis routes2020In: Journal of Sol-Gel Science and Technology, ISSN 0928-0707, E-ISSN 1573-4846Article, review/survey (Refereed)
    Abstract [en]

    In this review article the available results about application of sol–gel synthesis method for the preparation of different calcium phosphates and composite materials are summarized. The attention is paid to calcium phosphate-containing compounds which show the biological properties and could be used as potential phosphate bioceramics in medicine. It was demonstrated that the sol–gel synthesis method is a powerful tool for the synthesis of calcium hydroxyapatite and other phosphates, and different calcium phosphate-based composites at mild synthetic conditions resulted in high reproducibility, high phase purity, and desired morphology. Thus, the sol–gel synthesis method enables the researchers to develop biomaterials with superior features in terms of biomedical applications.

  • Sabau, Gabriel
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Lagerqvist, Ove
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Baddoo, Nancy
    Steel Construction Institute, UK.
    Stronger steels, higher penalties: Evaluation of flexural buckling experiments performed on welded high-strength steel struts2019In: ce/papers, E-ISSN 2509-7075, Vol. 3, no 3-4, p. 731-736Article in journal (Refereed)
    Abstract [en]

    Stability in a structural mechanics context has posed a continuous problem throughout history for mathematicians, engineers and architects. Flexural buckling is one of the main problems steel structures are faced with in order to ensure an economic design. Different equations have been derived to estimate critical loads that could lead to collapse of compressed members. The buckling resistance of compressed struts are calculated in Europe using the European buckling curves. The method of calculating the resistance implies the use of a reduction factor based on 5 different buckling curves. These buckling curves differ based on type of cross-section, fabrication method and steel grade. The method has been generally accepted since it proved to be reliable and versatile. The current design codes are assigning the same relevant buckling curve to the sections made of steels with yield stress of above 460 MPa. This conservative approach is one of the reasons that discourages the use of high-strength steels in common structural applications, since the designer does not see a direct benefit from the additional steel strength. The first part of the paper briefly describes the origin of the European buckling curves. The second part presents two analytical models for calculating flexural buckling limit loads. Flexural buckling experiments performed on welded box and I-sections made of high-strength steel, with the yield stress in the range of 690-960MPa. The third part analyses the existing buckling experiments and statistically evaluates the models proposed for estimating the resistance of high-strength steel struts subjected to pure compression. The final part addresses the potential future research in the context of developing adequate flexural buckling curves for high strength steel (HSS) members.

  • Danielsson, Clara
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
    Mapping of Material Transportation Routes in Production for Optical Measurement Instruments With The Purpose of Improving Efficiency2020Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
  • Hjulfors, Jenny
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
    Undersökning av möjlighet till underjordisk vattenrening: En förstudie av kväverening med flytande våtmarker2020Independent thesis Advanced level (professional degree), 300 HE creditsStudent thesis
    Abstract [en]

    The mining company LKAB operates an iron ore mine in Kiruna and is currently mining towards the main level at the depth of 1365 meters. Because of the depth, large amounts of groundwater come into the mine and this water has to be pumped away for the production to continue. During its way through the mine, the water is contaminated by, for example, explosive residues such as nitrogen compounds which needs to be removed.

    The water is today cleaned by a tailing pond and a clarification pond, but this method removes only small amounts of the nitrogen compounds. In order to remove nitrogen from the water, experiments have been performed with nitrogen removal plants in the recipient. The trials show on good results, but the problem is still remaining because of the limited growing season in the northern climate. An idea that has emerged is to move the vegetation and the purification process down into the mine where the temperature is constant, in order to be able to reduce nitrogen year-round.

    This Master’s thesis has investigated if the idea is feasible and what the plants require to be able to grow in the mine. The work is limited to the nitrogen in the water and does not investigate how the nitrogen removal processes in the plants work in the underground climate. The study shows on good possibilities for nitrogen removal in the mine where the existing pools can be used together with plant lights to give the plants opportunity to live underground.

  • Ingesbo Sjöström, Lina
    Luleå University of Technology, Department of Engineering Sciences and Mathematics.
    Metal Additive Manufacturing on the Nordic Market: Opportunities and Challenges2020Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    When thinking about additive manufacturing (AM), or 3D printing as most people knows it as, it is probably considered a modern technology, but the first 3D printer was actually released in 1987. But it is not until recently that companies have started to look more into the method for end use part manufacturing, since the patents for AM equipment expired in 2014. AM was mainly used for prototype manufacturing in the beginning, but since several different materials can be used for the technology now, there among metal, the parts made with AM can also be used for critical applications.

    The aim of the report was to investigate the opportunities and challenges for companies in the Nordics to use AM as a manufacturing method. To do this a survey was sent outin the beginning of the project to get a better understanding of how companies already uses AM and what other companies would need to consider implementing AM in their production. When a sufficient number of responses had been received, questions were designed based of the answers from the survey to use in interviews, with companies that somehow are involved with the AM industry.

    Based of the interviews it could be seen that all of the interviewed companies agreed that there is a lack of knowledge within AM and that the market for it is still immature. But if more people gets educated within the field and have faith in the technology, AM shows great potential, because it is already industrially applicable for end use part production.

  • Noosalung, Kitiphum
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics.
    Aasa, Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics.
    Quality assurance in low-volume assembly line at Scania2020Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Scania are now going through a transformation process from being a supplier of trucks, busses and engines to a supplier of complete and sustainable transport solutions. Scania's transmission assembly department in Södertälje is facing a variation of changing challenges linked to the powertrain and customer of tomorrow. Some of the challenges is related to assuring quality on low-volume electrified and hybridised products. In this thesis quality assurance of a low-volume assembly line at transmission's department has been investigated.

    The aims for the thesis project are to evaluate today's methods, equipment and process descriptions for how quality assurance are handled and how it can be implemented in a low-volume assembly line. The aim is to investigate what kind of quality assurance methods exist within Scania but also externally. The purpose is to give suggestions for Scania on which quality assurance methods are suitable for Scania's low-volume assembly line. Today the current level of quality assurance in a low-volume line is considerable low and the production have many processes between start and delivery. The production start with an order initiation which prints out a list of assembly order and included parts. The processes are manually handled by one operator from the beginning to the end and the work includes assembly, material picking and quality control. Due to limitations and lack of equipment, the assembler have a lot of responsibility. The processes are also lacking of traceability and have a high risk for allowing deviations to be build in the product. The current processes leads to increased risks of rework, longer lead time and lower quality.

    The thesis project started with a literature study with the focus on quality, quality assurance and lean production. A current state analysis was done to gain knowledge of the processes and to identify problems within the current state. Identified problems were through observations, interviews and analysis of PFMEA document. The problems were risks that could affect quality of the product, and it was then categorized into three major risk groups; pick, place and tools. To seek which equipment there are to handle these risks, how other companies and departments are working with quality assurance, internal and external study visits were carried out. Internally within Scania; Smart Factory Lab, Engine Assembly and Chassis Assembly. Externally; Volvo Group Trucks Operations Köping and Volvo CE Arvika. The results of the visits were evaluated to create a solution to make a suitable suggestion in term of cost, quality and flexibility for Scania.

    The thesis project resulted in a study that showcase what quality assurance methods and equipment existed on the market and what other companies are using to quality assure. The result is that for similar production, the companies are using rather similar methods and equipment. Equipment to handle risks, deviations involving picking materials and assembly. For Scania's low-volume production a solution and a recommendation of equipment was given. To handle the existing deviations and for upcoming similar low-volume production. Quality assurance equipment and methods are expensive but is considered necessary, a necessary cost and necessary waste. Scania is recommended to invest in short and long term solutions where the short term is to improve the current state. In a short term to secure the picking operations with easier solutions of dividing parts into boxes or trays on the cart during transportation from shelves. Installing pick to light connected to nutrunners for critical parts and further develop the digitalized checklist for improving visualization. In longer term, Scania should invest in quality assurance equipment for low-volume lines. Prioritize and invest in creating infrastructure for connection between equipment and tools to secure critical parts in early stages of the project. Finally, create a communication between Scania's internal plants in order to further improve and share the quality assurance knowledge.

  • Sandberg, Alexander
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences.
    Design and implementation of an administration portal: A web application interface with focus on accessibility and usability2020Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The last few years, giant companies like Facebook and Google have taken over the publishing market by attracting both advertisers and users to their platforms. This has caused smaller news publishers to lose their influence and their independence in the industry. To combat this trend, Newsadoo is on a mission to establish a collaborative news platform that benefits everyone involved. To help fulfill the company’s vision, the platform’s content has to be easily moderated by both Newsadoo and its partners to make sure that it satisfies the users’ needs.

    This master thesis concerns the design and implementation of a new solution for Newsadoo’s administrative portal, which will allow both internal administrators and external partners to moderate the content in Newsadoo’s main product. The work was done on site at Newsadoo’s office in Linz, Austria, during the fall term of 2019.

    The project progressed in bi-weekly sprints based on the principles of Lean UX, which were comprised of methods common to projects revolving around interface design and development. These were methods like user flows, site architecture mapping, wireframing, and different forms of testing and evaluation.

    The project resulted in Newsadoo Backoffice, a user interface with focus on accessibility and usability that facilitates easy moderation of Newsadoo’s main product. Newsadoo Backoffice is also a potential selling point for the company when trying to find new publishing partners to collaborate with, as this new solution also provides partners with useful data and knowledge on their own company’s performance.

  • Snellman, Emma
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences.
    Var Finlands sak vår?: En jämförande studie av norrbottninska dagstidningars skildrande av Vinterkriget 1939-1940.2020Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • Stare, Felix
    et al.
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences.
    Hansson, Victor
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences.
    User experience and occupant safety: Concept development of restraint system for the automobile outboard rear seat positions2020Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This is a master thesis project that is made in collaboration with Volvo Car Corporation, at the seat belts & child restraints department, located in Gothenburg, Sweden. The project description and objective of this project was to develop a concept, for the rear outboard seat positions, that makes the seat belt comfortable without compromising the safety with the focusing point on user experience. The safety systems of the car can be divided into two groups, active safety systems, and passive safety systems. The active safety systems help to prevent accidents from occurring and the passive safety systems are there to protect the occupants from serious injury in the event of an accident. Passive safety systems include airbags and seat belts, which are required by law in most countries. The seat belt system is the primary restraint system in the car. A challenge with current seat belt systems is to make one single seat belt geometry that fits all users optimally. A less than optimal seat belt geometry could lead to the belt rubbing against the neck with the possibility of misuse as a consequence or being positioned too far out on the shoulder, which makes the risks of torso rollout and injuries increase.The safety in the rear seat has been prioritized recently due to the new requirements stated by European New Car Assessment Programme, which is a new car assessment programme, that tests and evaluates different safety aspects of cars. Another reason is Volvos vision that no one should be killed or seriously injured in a new Volvo car by 2020, which is a continuous ongoing work of improving safety.This project has used a combination of the stage-gate process and a prototype-based process, which enabled prototype building and testing throughout the whole development. The Stage-Gate process was divided into 4 stages. These stages were Context immersion, Ideation, Implementation, and Finalization. At the end of each stage, there is a gate, meaning some things that needed to be delivered to Volvo Cars before proceeding on to the next stage.The work resulted in two concepts that are based on two different principles. Concept Ridge is a concept where the seat belt automatically adjusts to the occupant. The concept is based on that occupants with shorter torso needs a more outboard position in order to prevent the seat belt rubbing against their neck. It works by having a slanted surface placed on top of the seat that ‘guides’ the seat belt into an outboard position. If the occupant has a tall torso the shoulder belt barely touches the surface and therefore moves to its default inboard position. Ridge has been tested and evaluated with both crash test dummies and people with different statures and proportions since the crash dummies do not reflect people in reality.The other concept, Soft, is based on only having one static position and instead make the seat belt comfortable by covering it with a soft tube. Soft has the advantage of making the belt comfortable even when it is located in a safe position close to the occupant’s neck.

  • Widstrand, Marcus
    et al.
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences.
    Andersson, Samuel
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences.
    Assessing required safety measures for belt conveyors: Designing a safety assessment tool regarding standard 620+A1:20102020Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This is a Master of Science Thesis in Industrial Design Engineering conducted at Luleå University of Technology with the orientation towards product design and development. This report comprises 30 credits, started autumn 2019 and ended in the beginning of 2020. This thesis was done together with SITE, in cooperation with LKAB to together find a solution that could verify standard 620+A1:2010, to conclude if requirement of engaging more protection at belt conveyors would be necessary.

    The purpose of this master thesis is to find a solution in the form of a safety assessment tool which could aid investigations regarding standard 620+A1:2010 and whether the requirements are fulfilled or not regarding nip points on carrying and return idlers. This thesis also includes additional requirements given by LKAB that must be followed. The result should consist of a concept that can, with the help of a 50x50mm plate, determine if a conveyor belt can be lifted 50 mm with a force of 150 N.

    To be able to find a solution to this problem a design process named Snowflake has been used which consists of four phases: Context, Ideation, Concept and Product. The work is built on a theoretical framework with topics such as industrial design engineering, belt conveyors, ergonomics, user experience, interaction design and usability. This, combined with several creative methods to enhance creativity and inspiration followed by an extensive evaluation process, enabled the project team to develop a solution to the acknowledged problem.

    The project resulted in a conceptual tool that, with the help of a torque wrench, can determine the amount of force required during a safety assessment. Its shape allows measurements to be performed on belt conveyors with a vast variety of roller dimensions. The tool is designed to allow the user to use minimal effort to operate in all its usage stages, from carrying the tool to using it. By having a distance gauge that moves when the tool lifts the belt and stays at the threshold value, the results can be read away from the nip point which increases user safety and usability.

    The result fulfils the stated criteria and is therefore considered to be a successful result, but it may also serve as a foundation for further development considering the extensive theoretical research which supports the design and functions, despite it being a conceptual product.

    In the end, the project has resulted in a tool that clearly answers whether safety protectors are required for belt conveyors at nip points, according to parameters stated in safety standard 620+A1:2010, regarding carrying and return idlers.

  • Aparicio Rivera, Jorge
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Real time Rust on multi-core microcontrollers2020Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Today the majority of embedded software is written in C or C++ using the thread paradigm. C and C++ are memory unsafe programming languages that often appear in CVE (Common Vulnerability and Exploits) reports. Threads are a popular concurrency paradigm in SMP (Symmetric Multi Processor) systems; however, threads can deadlock and are hard to statically analyze for schedulability. At the same time, security is becoming more and more important thanks to the exponential grow of IoT (Internet of Things) devices; meanwhile, vendors are starting to ship more and more heterogeneous multi-core devices where the thread paradigm can not be applied. In this thesis, we present an alternative programming framework for building real time, safety critical and general purpose embedded software that is memory safe by construction and suitable for single-core, homogeneous multi-core and heterogeneous multi-core systems.

  • Petersson, Marcus
    et al.
    Luleå University of Technology, Department of Health Sciences, Nursing Care.
    Murtagh, Stephanie
    Luleå University of Technology, Department of Health Sciences, Nursing Care.
    Påskyndad död: En systematisk litteraturöversikt2020Independent thesis Basic level (degree of Bachelor), 180 HE creditsStudent thesis
  • Danell, Maria
    Luleå University of Technology, Department of Arts, Communication and Education.
    Barns perspektiv på delaktighet och inflytande i förskolan: "Vi bestämmer men fröken skriver, så att man vet vad man menar eller liksom tänker..."2020Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
  • Hobro, Filip
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
    Undersökning av hur nitrokarburering påverkar kolvar från Epiroc2020Independent thesis Basic level (professional degree), 180 HE creditsStudent thesis
    Abstract [en]

    The degree project has been done at the quality department at Epiroc in Fagersta aspart of the continuous quality control work that takes place there. In the project, it hasbeen investigated how a piston in a down-the-hole hammer is affected by the heattreatment process called nitrocarburization which is performed to give the material anincrease in surface hardness. The main part of the project has been to measure theproducts of interest in a measuring machine before and after nitrocarburization andthen analyzing the result. After the measurements had been made it could beobserved that there was an increase in dimension on the locations of the piston beingmeasured.

  • Alshammari, Musa
    et al.
    College of Engineering, University of Kerbala, Karbala, Iraq.
    Al Juboury, Maad F.
    College of Engineering, University of Kerbala, Karbala, Iraq.
    Naji, Laith A.
    Department of Environmental Engineering, College of Engineering, University of Baghdad, Baghdad, Iraq.
    Faisal, Ayad A. H.
    Department of Environmental Engineering, College of Engineering, University of Baghdad, Baghdad, Iraq.
    Zhu, Hongshan
    Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, P.R. China.
    Al-Ansari, Nadhir
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Naushad, Mu
    King Saud University, Riyadh, Saudi Arabia.
    Synthesis of a Novel Composite Sorbent Coated with Siderite Nanoparticles and its Application for Remediation of Water Contaminated with Congo Red Dye2020In: International Journal of Environmental Research, ISSN 1735-6865, E-ISSN 2008-2304Article in journal (Refereed)
    Abstract [en]

    Re-use of the byproduct wastes resulting from different municipal and industrial activities in the reclamation of contaminated water is real application for green projects and sustainability concepts. In this direction, the synthesis of composite sorbent from the mixing of waterworks and sewage sludge coated with new nanoparticles named “siderite” (WSSS) is the novelty of this study. These particles can be precipitated from the iron(II) nitrate using waterworks sludge as alkaline agent and source of carbonate. Characterization tests using X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) mapping revealed that the coating process was correctly achieved and siderite nanoparticles were planted on the surface of the composite sorbent. Interaction between Congo Red dye and composite sorbent was evaluated through a set of batch tests under the variation of agitation time, pH of aqueous solution, and sorbent dosage. The results proved that the prepared sorbent had a high ability in the treatment of water contaminated with Congo Red dye in comparison with previous studies and the maximum adsorption capacity reached to maximum value i.e. 9416 mg/g. The sorption process was governed by electrostatic attractions; however, Sips and Pseudo-second-order models described this process with coefficient of determination greater than 0.99.

  • Al Amli, Ali Sabah
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering. Department of Civil Engineering, Al-Mustansiriyah University, Palestine Street, Baghdad, Iraq.
    Al-Ansari, Nadhir
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Laue, Jan
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Numerical simulation of behaviour of reinforced concrete bars in saturated soil using theoretical models2020In: Journal of Engineering Science and Technology, ISSN 1823-4690, Vol. 15, no 1, p. 392-405Article in journal (Refereed)
    Abstract [en]

    This study presents a nonlinear analysis for square reinforced concrete (RC) foundation slab with bars used with both unsaturated and saturated soils in order to investigate, which response is affected by loading. Different parametric studies are undertaken in this study to determine the effect of load-displacement relationships for RC member or foundation with different cases such as (the distance of bars, diameters of bars reinforcement, types of reinforcement bars steel bars and geogrid reinforcement, yield stress for reinforcement and modulus of elasticity with compressive strength for concrete). A finite element model by ABAQUS software program is used to predict the load versus vertical displacement response of the tested RC foundations with soil by using other researchers´ experimental results. The present finite element models account for the constituent load-displacement behaviour between the RC foundations with soil and the effective load. The numerical results were compared with the experimental results obtained from other research, and good correlations were obtained. The models developed in this study can accurately capture the behaviour and predict the load-displacement of RC foundation with soil. This study shows that geogrid reinforcement enhanced the capacity of the foundation or member when used with different ratios of steel bars in soil and this provides a sustainable solution by reducing steel reinforcement. This geogrid ratio the reinforcement, while the member in saturated soil

    is less strong than it when in unsaturated soil.

  • Ahmed, Dooraid N.
    et al.
    Department of Mathematics, College of Education for Pure Sciences, University of Kirkuk, Kirkuk, Iraq.
    Naji, Laith A.
    Department of Environmental Engineering, College of Engineering, University of Baghdad, Baghdad, Iraq.
    Faisal, Ayad A. H.
    Department of Environmental Engineering, College of Engineering, University of Baghdad, Baghdad, Iraq.
    Al-Ansari, Nadhir
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Naushad, Mu.
    Department of Chemistry, College of Science, King Saud University, Riyadh, Saudi Arabia.
    Waste foundry sand/MgFe-layered double hydroxides composite material for efficient removal of Congo red dye from aqueous solution2020In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 10, p. 1-12, article id 2042Article in journal (Refereed)
    Abstract [en]

    We aimed to obtain magnesium/iron (Mg/Fe)-layered double hydroxides (LDHs) nanoparticles-immobilized on waste foundry sand-a byproduct of the metal casting industry. XRD and FT-IR tests were applied to characterize the prepared sorbent. The results revealed that a new peak reflected LDHs nanoparticles. In addition, SEM-EDS mapping confirmed that the coating process was appropriate. Sorption tests for the interaction of this sorbent with an aqueous solution contaminated with Congo red dye revealed the efficacy of this material where the maximum adsorption capacity reached approximately 9127.08 mg/g. The pseudo-first-order and pseudo-second-order kinetic models helped to describe the sorption measurements, indicating that the physical and chemical forces governed the removal process.

  • Bark, Emma
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
    Jonsson, Malin
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
    Solutions to Close an Informal Dumpsite in Debre Berhan, Ethiopia2020Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The rapid urbanisation in developing countries has outran the deployed financial and manpower resources that are supposed to handle public utility services in cities. One important service is solid waste management. The most common method used for solid waste management in developing countries is uncontrolled dumping of waste at unstructured and uncovered open dumpsites. Open dumpsites are related to pollution and safety aspects and creates environmental stress and health problems.

    The purpose of this thesis project was to minimise environmental and public health risks from an informal dumpsite in Debre Berhan, Ethiopia, by identifying solutions for a sustainable way of closing the site. The project was a complement to the SymbioCity in Ethiopia project and consisted of a literature study, a field excursion to the dumpsite, and interviews with involved parties and evaluations. The focus has been to find economical and accessible solutions to close the dumpsites in an environmentally friendly way.

    During the project, it was found that the closure of the informal dumpsite is not possible right away. Before closing the informal dumpsite, a waste disposal plan is required to ensure that the site can be closed without continued dumping. Therefore, the recommendation is to divide the closure into post- and pre-closure actions.

    The most economical and sustainable solution to close the informal dumpsite is to use local material when covering the waste. It is also important to choose available techniques for control of emissions that can be managed easily in the future. It is necessary to collect the generated landfill gas to minimise the pressure on the cover. It is recommended to redirect the inflow of surface water from the area above the dumpsite to reduce the leachate and control the erosion of the cover. It is suitable to use embankment and swales for redirection of the surface water.

  • Olofsson, Anna
    et al.
    Luleå University of Technology, Department of Arts, Communication and Education.
    Taavo Sidér, Nora
    Luleå University of Technology, Department of Arts, Communication and Education.
    Förskollärares konstruktioner av undervisning: En kvalitativ studie om förskollärares konstruktioner av undervisning utomhus och inomhus2020Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Syftet med studien var att undersöka förskollärares konstruktioner av undervisning utomhus respektive inomhus i relation till ett socialkonstruktionistiskt perspektiv. Studien baserades på en kvalitativ metod med intervjuer som datainsamlingsmetod. Fem intervjuer har utförts, vilka var belägna inom en och samma region, där förskollärarnas svar ligger till grunden för studiens resultat. Det som var framträdande i resultatet var att konstruktionerna utomhus och inomhus skiljde sig åt. Utomhus skedde fler spontana undervisningstillfällen, medan det inomhus till större del var planerat. Resultatet visade även att förskollärare hade svårigheter i att skilja begreppen utbildning, undervisning och lärande åt. Under bearbetningen av analysen sorterade, reducerade och argumenteras materialet, vilket utgjorde olika teman i resultatet; förskollärares konstruktioner av undervisning, undervisning inomhus och undervisning utomhus.

  • Shamasaki, Shahrzad
    et al.
    Luleå University of Technology, Department of Health Sciences, Nursing Care.
    Khan, Hina
    Luleå University of Technology, Department of Health Sciences, Nursing Care.
    Kvinnors upplevelse av att leva med könsstympning: Analys av självbiografier2020Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Ordet kvinnlig könsstympning omfattaralla tillvägagångssätt, bådedelvis eller fullständigt borttagande av kvinnliga könsorgan. Det finns cirka 130–140 miljoner könsstympade kvinnor över hela världen. Ingreppet medför många hälsorisker och komplikationer för kvinnan. Genom att tillämpa kunskap om könsstympning i vården avdrabbade kvinnorkan sjukvårdspersonal erbjuda stöd i form av att aktivt lyssna på kvinnors perspektiv och problem.Syftet med studien var att beskriva upplevelser hos kvinnor som könsstympats. Metoden som valdes var kvalitativ innehållsanalys baserat på tre självbiografier avkvinnor som genomgått könsstympning. Analysen resulterade i tre kategorier:Att ses som äcklig och oren av andra och sakna förklaring,Att andra firar när någon karvat i ens känsligaste delar men själv känna rädsla och förakt, Att leva ett smärtsamt liv utan njutning och i skräck vid menstruation och graviditet. Att sjuksköterskan ökar sinförståelse förkvinnor som har könsstympats för att kunna ge en så god omvårdnad som möjligt samt attsjuksköterskanvid vårdmötenmed dessa kvinnor är uppmärksam på kulturella skillnader som finns mellan Sverige och de länder där förekomst av omskärelsesär vanligtär tvåviktiga aspekter.

  • Silfwerbrand, Christina
    Luleå University of Technology, Department of Engineering Sciences and Mathematics.
    Feasibility study of modelling a virtual climate chamber with CFD2020Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The company tests their industrial tools in a climate chamber to assure that tools meet the ISO-standard requirements and to assure personnel safety. Since it takes time to prepare the physical tool and to get a time slot to test it, this process was a bottleneck. Especially interesting is the temperature testing process, and the question of whether or not the entire tool actually reaches the reference temperature within a time interval has been asked. This is the master thesis project’s core. The time it takes for the entire tool to reach a uniform temperature distribution is called thermal soak time and was unknown at the beginning of the project. The aim was to find the thermal soak time, both for the climate chamber and for a virtual CFD-model of the climate chamber. A simulation model was done in the software Altair HyperMesh and validated with experimental data from the climate chamber on site.

    The result of the experiments of the climate chamber showed the impact of all the unknown parameters and contributed to the feasibility study. Temperature cycles were run in the climate chamber to get thermal soak times for increase runs and decrease runs. This resulted in an understanding of how the climate cham- ber works and its limitations. As for the CFD-model, the simulation model of the climate chamber showed promising results of achieving a thermal soak time for all of the components of the tool. However, there are some limitations to consider when performing simulations in the specified software and with the CFD-model.

    In conclusion, the thermal soak time for the best-case scenario with aluminum is determined to be approxi- mately three minutes whilst, for the worst-case scenario, the same time is inconclusive since the simulation did not reach steady state due to time limitation of the project. However, the feasibility study of the climate chamber is complete, and proof of concept is confirmed for transforming a physical climate chamber into a virtual climate chamber. Further studies need to be executed to achieve a robust CFD-model of a virtual climate chamber.

  • Wallstål, Melinda
    et al.
    Luleå University of Technology, Department of Arts, Communication and Education.
    Palo, Desiree
    Luleå University of Technology, Department of Arts, Communication and Education.
    “Man lägger ihop en massa pusselbitar och så kommer det kanske ett blåmärke “: En kvalitativ studie om pedagogers arbete med barn i omsorgssvikt.2020Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Syftet med studien är att erövra kunskap utifrån pedagogers erfarenheter om vad som kan väcka misstanke att ett barn utsätts för omsorgssvikt samt hur arbetet vid en misstanke kan se ut. Våra forskningsfrågor sökte svar på hur pedagoger beskriver att de tar tillvara barns signaler vid misstanke om omsorgssvikt samt hur processen från misstanke om omsorgssvikt till orosanmälan kan se ut. Studien lyfter fram olika former av omsorgssvikt och vilka tecken som är vanligast inom respektive form av omsorgssvikt. Studien redogör även för hur dessa tecken kan visa sig hos barnet. Den teoretiska utgångspunkten för studien var det socialkonstruktionistiska perspektivet som bygger på att kunskap skapas socialt. Som metod valdes en kvalitativ ansats i form av semistrukturerade intervjuer som datainsamlingsmetod. Ljudinspelning och anteckningar användes som dokumentationsverktyg till intervjuerna. För analys och resultat har sedan materialet transkriberats. En kvalitativ analysmetod användes i syfte att hitta olika kategorier som besvarar forskningsfrågorna. Till detta konstruerades en analysmodell utifrån Killéns (2014) överlevnadsstrategier. Resultatet visar att pedagogerna tar vara på barns signaler genom bland annat sociala konstruktioner och dokumentationer samt att processen från att en misstanke väcks till att orosanmälan görs kan se väldigt olika ut beroende på vilken form av omsorgssvikt det kan handla om. Resultatet visar även att pedagogerna omedvetet använder sig av Killéns överlevnadsstrategier när de beskriver sitt arbete med barn som blivit utsatta för omsorgssvikt. Problematiken som uppstår när pedagogerna omsätter dessa strategier i praktiken blir att de blundar för barnets verklighet, vilket kan leda till att anmälan fördröjs eller uteblir.

  • Bui, Dieu Tien
    et al.
    Geographic Information Science Research Group, Ton Duc Thang University, Ho Chi Minh City, Vietnam. Faculty of Environment and Labour Safety, Ton Duc Thang University, Ho Chi Minh City, Vietnam.
    Shirzadi, Ataollah
    Department of Rangeland and Watershed Management, Faculty of Natural Resources, University of Kurdistan, Sanandaj, Iran.
    Amini, Ata
    Kurdistan Agricultural and Natural Resources Research and Education Center, AREEO, Sanandaj, Iran.
    Shahabi, Himan
    Department of Geomorphology, Faculty of Natural Resources, University of Kurdistan, Sanandaj , Iran. Department of Zrebar Lake Environmental Research, Kurdistan Studies Institute, University of Kurdistan.
    Al-Ansari, Nadhir
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Hamidi, Shahriar
    Department of Water Science and Engineering, Faculty of Agriculture, University of Kurdistan, Sanandaj, Iran.
    Singh, Sushant K.
    Department of Health, Insurance & Life Sciences, Data & Analytics, Virtusa Corporation, Irvington, NJ, USA.
    Pham, Binh Thai
    Institute of Research and Development, Duy Tan University, Da Nang, Vietnam.
    Ahmad, Baharin Bin
    Faculty of Built Environment and Surveying, Universiti Teknologi Malaysia (UTM), Johor Bahru, Malaysia.
    Ghazvinei, Pezhman Taherei
    Department of Civil Engineering, Technical and Engineering College, Ale Taha University, Tehran, Iran.
    A Hybrid Intelligence Approach to Enhance the Prediction Accuracy of Local Scour Depth at Complex Bridge Piers2020In: Sustainability, ISSN 2071-1050, E-ISSN 2071-1050, Vol. 12, no 3, p. 1-24, article id 1063Article in journal (Refereed)
    Abstract [en]

    Local scour depth at complex piers (LSCP) cause expensive costs when constructing bridges. In this study, a hybrid artificial intelligence approach of random subspace (RS) meta classifier, based on the reduced error pruning tree (REPTree) base classifier, namely RS-REPTree, was proposed to predict the LSCP. A total of 122 laboratory datasets were used and portioned into training (70%: 85 cases) and validation (30%: 37 cases) datasets for modeling and validation processes, respectively. The statistical metrics such as mean absolute error (MAE), root mean squared error (RMSE), correlation coefficient (R), and Taylor diagram were used to check the goodness-of-fit and performance of the proposed model. The capability of this model was assessed and compared with four state-of-the-art soft-computing benchmark algorithms, including artificial neural network (ANN), support vector machine (SVM), M5P, and REPTree, along with two empirical models, including the Florida Department of Transportation (FDOT) and Hydraulic Engineering Circular No. 18 (HEC-18). The findings showed that machine learning algorithms had the highest goodness-of-fit and prediction accuracy (0.885 < R < 0.945) in comparison to the other models. The results of sensitivity analysis by the proposed model indicated that pile cap location (Y) was a more sensitive factor for LSCP among other factors. The result also depicted that the RS-REPTree ensemble model (R = 0.945) could well enhance the prediction power of the REPTree base classifier (R = 0.885). Therefore, the proposed model can be useful as a promising technique to predict the LSCP.

  • Palm, Emanuel
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Bodin, Ulf
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Schelén, Olov
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Approaching Non-Disruptive Distributed Ledger Technologies via the Exchange Network Architecture2020In: IEEE Access, E-ISSN 2169-3536, Vol. 8, p. 12379-12393Article in journal (Refereed)
    Abstract [en]

    The rise of distributed ledger technologies, such as R3 Corda, Hyperledger Fabric and Ethereum, has lead to a surge of interest in digitalizing different forms of contractual cooperation. By allowing for ledgers of collaboration-critical data to be reliably maintained between stakeholders without intermediaries, these solutions might enable unprecedented degrees of automation across organizational boundaries, which could have major implications for supply chain integration, medical journal sharing and many other use cases. However, these technologies tend to break with prevailing business practices by relying on code-as-contracts and distributed consensus algorithms , which can impose disruptive requirements on contract language, cooperation governance and interaction privacy. In this paper, we show how our Exchange Network architecture could be applied to avoid these disruptors. To be able to reason about the adequacy of our architecture, we present six requirements for effective contractual collaboration, which notably includes negotiable terms and effective adjudication . After outlining the architecture and our implementation of it, we describe how the latter meets our requirements by facilitating (1) negotiation, (2) user registries, (3) ownership ledgers and (4) definition sharing, as well as by only replicating ledgers between stakeholder pairs. To show how our approach compares to other solutions, we also consider how Corda, Fabric and Ethereum meet our requirements. We conclude that digital negotiation and ownership could replace many proposed uses of code-as-contracts for better compatibility with current contractual practices, as well as noting that distributed consensus algorithms are not mandatory for digital cooperation.

  • Chapman, David
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
    Larsson, Agneta
    Luleå University of Technology, Department of Health Sciences, Health and Rehabilitation.
    Climate change and human behaviour: Understanding modal choice in a rapidly urbanising Arctic2020In: Local or Global Arctic?: Multi-scaled considerations of connections and remoteness in climate-impacted communities, 2020Conference paper (Refereed)
    Abstract [en]

    This research explores the human dimension of non-motorised transport, i.e. soft-mobility in Arctic communities. Empirical results are used to show how people’s modal choice in the European Arctic is being influenced by climate evolution and human-made climate change. From these results, it is possible to conceive new visions of the how to design the outside environments of Arctic settlements that can better enable people to move around in Arctic communities with reduced reliance on vehicles. At the societal level, this research will help reduce energy consumption and pollution from transport. For the individual, it highlights social, economic and the health benefits of soft-mobility. This includes creating places that are attractive, safe, and recognisable, as a basis for people’s informed decision-making about outdoor activities and modal choice. Pilot projects are ongoing in Riksgränsen, Björkliden and Abisko (Sweden) with data collected from residents and tourists using citizen science. Outcomes have practical and policy implications for town planning and tourism.

    The project is supported by the ARCTIC FIVE (a partnership of UiT The Arctic University of Norway, Luleå University of Technology, Umeå University, The University of Lapland and The University of Oulu) and Access Abisko 2020-22 (research enabling by the Swedish Polar Research Secretariat).

  • Maligranda, Lech
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mathematical Science.
    Ciesielska, Danuta
    Alfred Rosenblatt (1880-1947). Polish-Peruvian mathematician2019In: Banach Center Publications, ISSN 0137-6934, E-ISSN 1730-6299, Vol. 119, p. 57-108Article in journal (Refereed)
    Abstract [en]

    Alfred Rosenblatt (1880-1947) was a Polish mathematician born into a Jewish family in Krakow (Kraków, Poland). He studied in Vienna, Krakow, Göttingen, and worked at the Jagiellonian University in Krakow (1910-1936) and at the University of San Marcos in Lima, Peru (1936-1947). During the Second World War, Rosenblatt accepted Peruvian citizenship. His work was important for the development of mathematics in Peru, including the foundation of the National Academy of Exact Sciences, Physics and Natural Sciences in Lima. He is mentioned among the four mathematicians of the twentieth century most important for Peru (F. Villarreal, G. Garcia Diaz, A. Rosenblatt and J. Tola Pasquel). He spent the first half of 1947 on a scholarship at the Institute for Advanced Study in Princeton and had several lectures at other universities in the USA.

    Rosenblatt published almost three hundred scientific papers in various fields of pure and applied mathematics, including ordinary and partial differential equations, algebraic geometry, theory of analytic functions, probability, mathematical physics, three-body problem, hydrodynamics and other applications of mathematics. About 180 papers were published in the years of his work in Poland and about 120 in the years he worked in Peru. His publications are in Polish, German, French, Italian, Spanish and English. Rosenblatt participated actively in four International Congresses of Mathematicians: Cambridge (1912), Strasbourg (1920), Bologna (1928), Zurich (1932). He presented three talks in Bologna and one in Zurich.

    We describe Alfred Rosenblatt's life and important parts of his work in detail. We have made an effort to see all his papers, so as not to miss any of his achievements in mathematics and applications, including papers and information written in Spanish; e.g., [Ro11], [Ro13]-[Ro16] and [Ro20]. We have already written three articles, two in Polish [Ro8], [Ro9] and one in Russian [Ro12], to introduce him to Polish and Russian mathematicians. Now we want to do the same for a wider range of scientists with this article in English. Some information on Rosenblatt can also be found in [Ro1]-[Ro6], [Ro10] and [Ro17]-[Ro19].

  • Holmqvist, Ida
    Luleå University of Technology, Department of Arts, Communication and Education.
    Med dans som uttrycksform: Hur barn genom dans gestaltar och kommunicerar sina upplevelser av fenomenet årstider2020Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Studiens syfte är att undersöka hur dans kan användas som uttrycksform av barn i förskolan. Det fokus som studien har är barns upplevelser av årstider, hur barnen gestaltar och kommunicerar dessa via dansen. För att genomföra studien och möjliggöra att få svar på forskningsfrågorna utformades ett mindre dansprojekt tillsammans med en barngrupp där jag gick in i rollen som förskollärare. Studien utgår ifrån en kvalitativ metod och de data som har samlats in baseras på deltagande observation, videoobservation och ljudinspelning. Resultatet visar att barnen gestaltar och kommunicerar sina upplevelser av årstider utifrån personliga erfarenheter. De använder kroppens rörelser till att gestalta olika naturfenomen för respektive årstid och dansar årstidstypiska lekar, detta då leken kan ses som en stor del av barns livsvärld.

  • Carl, Jennie
    Luleå University of Technology, Department of Arts, Communication and Education.
    Naturvetenskap och estetiska lärprocesser: En studie om hur naturvetenskap och estetiska lärprocesser integreras i förskolan2020Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Syftet med studien är att öka kunskapen om hur förskollärare planerar och genomför undervisning där estetiska lärprocesser integreras med naturvetenskap. Utifrån syftet har tre forskningsfrågor skapats för att ta reda på förskollärarnas avsikter med en aktivitet där de ska integrera de två ämnena, hur de iscensätter undervisningen samt vilka reflektioner förskollärarna ger uttryck för efter undervisningssituationen.

    Forskningsfrågorna har besvarats genom att använda en kombination av tre metoder. Observation, intervju och stimulated recall gjorde det möjligt att synliggöra förskollärarnas avsikter när de planerade inför aktiviteten där de skulle integrera estetiska lärprocesser och naturvetenskap, vad som skedde i praktiken samt deras reflektioner om det.

    Resultatet visar att estetiska lärprocesser och naturvetenskap ingår i hela processen från planering till genomförande och reflektion. Resultatet tyder dock på att ämnena endast integreras med varandra under genomförandet. Estetiska lärprocesser och naturvetenskap får även olika stort utrymme, både i relation till varandra och beroende på vilken del av processen som studeras.

    Förskollärares förhållningssätt till estetiska lärprocesser och deras kunskaper, eller bristande kunskaper, om de två ämnena påverkar hur undervisningen inom dem sker. Det påverkar vilket innehåll och material förskollärarna väljer att arbeta med, vilket tillvägagångssätt som används och hur de arbetar med barnen.

  • Kokkinen, Heli
    Luleå University of Technology, Department of Arts, Communication and Education.
    Regnbågsfamiljer i förskolan: En kvalitativ studie om hur regnbågsfamiljer konstrueras i förskolan2020Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The aim of this study was to find out how preschool teachers construct LGBTQ families in preschool and what norms of family emerge from preschool teachers´ stories. The study rests on the social constructionist perspective where qualitative interviews were conducted to answer the study´s purpose and questions. The result show that LGBTQ children are excluded in preschool if LGBTQ families are not included and made visible. In a wider perspective this may mean that LBGTQ children in preschool suffer from socially alienation if they do not get their family construction confirmed in preschool. Despite this, the results show a clear norm of heteronormativity in preschool teachers´ stories

  • Mäki, Emma
    et al.
    Luleå University of Technology, Department of Arts, Communication and Education.
    Söderström, Lisa
    Luleå University of Technology, Department of Arts, Communication and Education.
    "Barnen behöver få bli sedda, sätta spår och göra skilnad": En kvalitativ studie om förskollärares beskrivningar av barns perspektiv inom det systematiska kvalitetsarbetet2020Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • Schölund, Oskar
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
    Analys av sprickutveckling på markytan i Kiirunavaara gruvområde samt utvärdering av fotogrammetri2020Independent thesis Advanced level (professional degree), 300 HE creditsStudent thesis
    Abstract [sv]

    LKAB (Luossavaara-Kiirunavara Aktiebolag) bryter och förädlar järnmalm i Norrbotten. Under 2018 omsatte LKAB cirka 26 miljarder kronor. Koncernen äger två underjordsgruvor, en i Malmberget och en i Kiruna, samt tre dagbrottsgruvor i Svappavaara, varav en för tillfället är i drift.

    Brytningsmetoden som används i Kiirunavaara-gruvan är storskalig skivrasbrytning. Metoden bygger på principen att sidoberget, i första hand hängväggen, successivt bryts sönder, och fyller upp det utlastade utrymmen. Sönderbrytningen är nödvändig för att brytningsmetoden skall fungera optimalt. En effekt av detta är att omgivande berg så småningom deformeras. Detta omöjliggör, på sikt, att ha bebyggelse och infrastruktur i det område som berörs av större deformationer, vilket har lett till behovet av en pågående samhällsomvandling. Detta innebär att det är av stor vikt att, om möjligt, förbättra förståelsen för deformations- och uppblockningsmekanismer i bergmassan, till följd av skivrasbrytning.

    Examensarbetet är indelat i två delar:

    • Första delen syftar till att ta fram en rekommendation för en programvara och analysmetodik som kan användas för utvärdering av strukturriktningar från UAV-data, detta då det på många ställen kring gruvområdet är det en säkerhetsrisk att beträda områden för att utföra strukturkartering.

     

    • Andra delen omfattar analys och utvärdering av strukturers eventuella påverkan på uppblockning- och deformationsprocessen vid LKAB:s Kiirunavaaragruva för liggvägg, hängvägg samt Sjömalmen-området. Detta innefattar dels tillämpning av ovannämnd programvara och metodik, dels analys och tolkning av alla tillgängliga sprickkarteringar på markytan, samt visualisering, t.ex. med rosdiagram, i CAD-format, etc.

    I examensarbetet utfördes en mindre fältstudie, detta för att verifiera vad tidigare studier visat på, samt för att testa olika programvaror. Resultaten verifierade de tidigare studierna, att kartering med CloudCompare ger bra resultat jämfört med traditionell kartering med kompass. Från de erhållna resultaten från fältstudien utfördes sedan ett större, storskaligt test över rasgropen. Resultaten visade att den kommersiella programvaran Pix4D tillsammans med den öppna och fria programvaran CloudCompare och plugin-programmet qFacet fungerar bra för att skapa 3D-modeller och analysera bergmekaniska parametrar från UAV-data. Dock var det endast storskaliga strukturer (ytor) som gick att extrahera ur modellerna. Flertalet av dessa visade korrelation med de sprickorienteringarna gjorda från underjordskarteringar för häng- och liggväggen i KUJ och Sjömalmen.

    För den utförda sammanställningen av sprickinventeringen på häng- och liggväggen samt tolkade strukturer på hängväggen, visade resultaten på att förekomsten av sprickor, sjunkhål samt kanter finns i områden med hög koncentration av deformationszoner/strukturer. Detta är tydligast i norra delen av hängväggen. Sprickgrupperna på markytan uppstår oftast parallellt med deformationszonerna och i flera fall uppstår och utvecklas en kant i de områden där dessa är lokaliserade. Bedömd ”raskant” uppstår ungefär två år efter att de första sprickorna upptäckts. Orienteringen för sprickor och kanter stämmer relativt bra överens med tidigare utförda underjordskarteringar. För sjunkhålen är majoriteten koncentrerade till ett mindre område på hängväggen. I området förekommer två deformationszoner, en som korsar området och en som stupar ner under området. Karaktären på dessa deformationszoner kan vara orsaken till uppkomsten av sjunkhålen i området.

  • Skott, Emma
    Luleå University of Technology, Department of Arts, Communication and Education.
    Matematikundervisning i utomhusmiljön: Förskollärares erfarenheter av utomhusmiljöns betydelse för undervisning i matematik2020Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Syftet med studien har varit att synliggöra förskollärares erfarenheter av hur utomhusmiljön kan bidra till undervisning i matematik. Insamling av material har skett genom sex kvalitativa intervjuer som genomfördes på tre olika förskolor. Bearbetning av det insamlade materialet skedde genom en innehållsanalys där tre huvudteman blev synliga, vilka sedan presenteras i studiens resultat. Det som blev tydligast i resultatet för studien var att planerad undervisning i matematik inte är särskilt vanligt i utomhusmiljön, utan att undervisning i matematik oftast sker i situationer som uppstår spontant. Respondenterna ansåg att pedagogerna har en viktig roll när det kommer till barns lärande i matematik. En slutsats av detta blev att det snarare är pedagogerna som är den viktigaste faktorn när det kommer till barns utveckling och lärande i matematik, oavsett om det är i utomhus- eller inomhusmiljön.

  • Svanström, Carolin
    Luleå University of Technology, Department of Arts, Communication and Education.
    Vad skulle digital kompetens kunna bli i en förskola, för barnen och för personalen?: En kritisk granskning av hur digital kompetens och barns digitala kompetensbehov konstrueras i förskolan2020Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Syftet med studien har varit att kritiskt granska och diskutera hur digital kompetens och barns digitala kompetensbehov konstruerats inom förskolan, samt diskutera vad digital kompetens skulle kunna bli i en förskola, för barnen och för personalen. Studien har genomförts genom strukturerade fokusgruppsdiskussioner, där deltagarna har varit utbildade förskollärare. Studien utgår ifrån en diskursanalytisk ansats med syftet att finna den bakomliggande och gemensamma diskursen som förskollärarna, genom språket konstruerat och bidragit med i fokusgruppsdiskussionerna. Studien har eftersträvat att synliggöra hur begreppet digital kompetens konstruerades genom den sociala interaktionen och till vem barnet blev i mötet med förskolans digitala kompetensuppdrag. I resultatet framträdde tre teman som utgjorde diskursen tillsammans med underordnade aspekter tillhörande respektive tema. Resultatet visar utifrån de framträdande teman att barnen är både bärare och mottagare av digital kompetens, att den framtida kompetensen bygger på källkritik likväl för barnen och för personalen samt att digital kompetens konstrueras som användning och hantering.

  • Lindström, Helena
    et al.
    Luleå University of Technology, Department of Health Sciences.
    Vaattovaara, Magdalena
    Luleå University of Technology, Department of Health Sciences.
    Patienters erfarenheter av att vårdas i öppen psykiatrisk tvångsvård2020Independent thesis Advanced level (degree of Master (One Year)), 40 credits / 60 HE creditsStudent thesis
    Abstract [sv]

    Bakgrund: En stor revision av lagstiftningen för tvångsvård skedde 2008 då lagen om öppen psykiatrisk tvångsvård [ÖPT] tillkom. En av intentionerna med lagstiftningen var att användandet av tvångsåtgärder skulle minska, och patienter som får vård i ÖPT vistas i regel i sitt hem. Det finns dock bestämmelser att förhålla sig till för den som får öppen tvångsvård, vårdformen är tämligen omfattande och påverkar nästan alla aspekter av en individs vardag. Studier om vilka erfarenheter och upplevelser patienterna faktiskt har av att vårdas i ÖPT är dock sällsynta.

    Syfte: Att beskriva patienters erfarenheter av att vårdas i öppen psykiatrisk tvångsvård

    Metod: Åtta patienter som vårdas i öppen psykiatrisk tvångsvård har ingått som deltagare i studien. Det är en kvalitativ semistrukturerad intervjustudie, intervjuerna var individuella och analyserades med en manifest metod för att synliggöra patienternas egna ord om sina erfarenheter.

    Resultat: Resultatet beskrevs genom temat: Begränsningar och möjligheter, och visade att flertalet områden i deltagarnas liv berördes. Resultatet kunde sammanfattas i fem huvudkategorier: Att känna sig begränsad i sin vardag; Att känna vanmakt av att inte bli trodd och inte kunna påverkaAtt känna sig utanför och inte förstå sina rättigheter; Att känna sig involverad av att bli sedd och hörd samt Att vårdens innehåll är viktigare än formen.

    Slutsats: Att vårdas i ÖPT innebär att känna sig begränsad, men slutsatsen är att denna erfarenhet till viss del kan hänga samman med otillräcklig medvetenhet hos patienter om vad ÖPT och dess villkor innebär. Vården misslyckas i vissa fall att tillgodose patienters behov av och rätt till information, och det finns uppenbara brister i att involvera både patienter liksom anhöriga i utformandet av vården, samt hur vården tar hänsyn till patienters lagliga rättigheter. Vården kan också bli bättre på att ge patienter personligt anpassad information samt tro på patientens önskan att medverka. Att patienter bjuds in till diskussion och medverkan kan öka möjligheter till förståelse och acceptans för vårdbehovet, att ges utrymme att få uttrycka sin åsikt samt ha möjlighet att påverka stärker också autonomi. Det är även betydelsefullt för patienterna att finnas i ett sammanhang, omvårdnadspersonal behöver därför tillvarata de erfarenheter som beskrivs som främjade och arbeta motiverande. Det finns positiva konsekvenser av vårdformen, såsom ökat stöd som ett resultat av tvingande samverkan. Men vi drar slutsatsen av att finns betydande brister, varför det är ett angeläget område i behov av översyn gällande hur patienters lagliga rättigheter tillgodoses.

  • Aho, Joel
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
    Användning av 5D-BIM för planering av både industriellt och traditionellt byggande2020Independent thesis Advanced level (professional degree), 300 HE creditsStudent thesis
    Abstract [en]

    BIM – Building information modelling is used today by architects, structural engineers,contractors and property owners among others. BIM is a tool where a 3D-model of the projectcan be used as a source of information.When the 3D-model contains measurements/quantities and types of material it becomes apowerful tool when doing cost estimations/quantity takeoffs and production planning. The usageof BIM-models for these activities is a relatively new way of working and there are very fewstandards and proven methods. To have use of the BIM-model it also takes an implementation ofcost estimate- and planning programs that supports the use of BIM. Also, there are no standardsor guidelines for the configuration of the BIM-model.Research show that the use of BIM-models in quantity takeoff and production planning is bothtime-saving and more cost efficient then the use of the traditional ways where 2D-CAD drawingswith included descriptions is the only source of information. Earlier reports and master thesis’salso show how 5D-BIM is used today and how it can be implemented for companies with eitherindustrial- or more traditional concepts. 5D-BIM is a method where beyond the 3D-model, timeand cost are also included as dimensions 4, and 5.This report aims to evaluate under what conditions an implementation of 5D-BIM is possible fora contractor with a concept that includes both industrial- and traditional building, and alsoevaluate the possibilities and problems that occur during implementation. The use of BIM differsbetween industrial “off-site construction” and traditional “on site construction”. The author ofthis thesis therefor wants to study a company with a concept that includes both industrial andtraditional practices and also evaluate what information is requested in the BIM-model.An explorative case study has been conducted at a partially industrial contractor that produceshouses. The method 5D-BIM has been implemented and current workflow has been studied thrumodel configuration-, cost estimation to production planning. The study of the current workflowis the foundation for the implementation of 5D-BIM and the evaluation of § model configuration.The study shows how 5D-BIM as a method can be implemented for a company that has both onandoff site construction as a concept, and used to increase predictability in the projects.

  • Lindström Rignell, Ludvig
    et al.
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences.
    Nohlgård, Claudia
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences.
    Design of a Cultivation Unit: Communicating the potential of reusing residual heat by using the design of a cultivation unit2020Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Today, climate change is one of the world's greatest challenges. The main cause of this is humans' emissions of greenhouse gases, which for instance occur when burning fossil fuels. A prerequisite for meeting this challenge is that society change the way energy is produced and used. In the pursuit of fighting climate change, it is therefore crucial to create awareness among people regarding energy use.

    The purpose of this thesis project is to design a cultivation unit which uses residual heat. In this way, we aim to create awareness regarding the reuse of energy that would otherwise be wasted in society. To achieve this, we have used an established design process and creative methods, such as workshops, focus groups and prototyping. The thesis project resulted in a concept for a cultivation unit that in an innovative way brings attention to the reuse of residual heat.

    The work has been carried out in collaboration with Luleå Energi, an energy company that supplies Luleå with energy, and works to create conditions for more sustainable energy use.

  • Tzivis, Natasa
    et al.
    Luleå University of Technology, Department of Health Sciences.
    Srithang Sandgren, Pornthip
    Luleå University of Technology, Department of Health Sciences.
    Patientens upplevelser vid kolonundersökning med datortomografi: En litteraturöversikt2020Independent thesis Basic level (degree of Bachelor), 180 HE creditsStudent thesis
    Abstract [en]

    Introduction: The term colorectal cancer (CRC) means cancer of the colon and rectum.Colorectal cancer is the third leading cause of death worldwide with statistically rising mortality and affects thousands of people every year. The disease is investigated with diagnostic imaging where the most common is colonoscopy but also with computed tomography (CT) if the colonoscopy is incomplete or if the patient is unable to undergo a colonoscopy. The examination requires accurate bowel cleansing as well as a limited food intake, which leads to physical as well as psychological concern in the patient. Adequate information before, during and after the examination is necessary to facilitate the patient's mental and physical condition. Aim: The purpose of the study was to compile and illustrate the state of knowledge regarding patients' experiences before and during a CT colon (CTC) examination. Method: The literature study was conducted as a general literature review. Thirteen articles with both qualitative and quantitative approaches were included in the study after a quality review of all.Results: Four main findings were identified in the result. These consisted of physical efforts, concern and anxiety, embarrassment and reluctance for the study related to ethnicity and gender, and the acceptance of discomfort with the study itself. Conclusion: Many of the patients experienced pain during the examination which was related to bowel dilatation. Since many of the patients experienced that the examination was embarrassing and physically stressful, it is very important to have adequate information and a good dialogue. This can reduce their concerns, provide security and increase the manageability of the investigation. It is of utmost importance not to violate the patient's integrity and to provide encouragement during ongoing examination as well as after.

  • Ali, Ammar A.
    et al.
    College of Engineering, University of Baghdad, Baghdad, Iraq.
    Hassan, Rebwar
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Dawood, Anwar Hazim
    College of Engineering, Department of Civil Engineering, Koya University, Koya, Iraq.
    Al-Ansari, Nadhir
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Ali, Salahalddin
    Department of Geology, University of Sulaimani, Sulaymaniyah, Iraq. President of Komar University of Science and Technology, Komar University of Science and Technology, Sulaymaniyah, Iraq.
    Knutsson, Sven
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Sediment flux from Lesser Zab River in Dokan Reservoir: Implications for the sustainability of long‐term water resources in Iraq2020In: Rivers Research and Applications: an international journal devoted to river research and management, ISSN 1535-1459, E-ISSN 1535-1467Article in journal (Refereed)
    Abstract [en]

    Prudent management of Iraqi water resources under climate change conditions requires plans to be based on actual figures of the storage capacity of existing reservoirs. With the absence of sediment flushing measures, the actual storage capacity of Dokan Reservoir (operated since 1959) has been affected by the amount of sediment delivered during its operational life leading to an undetermined reduction in its storage capacity. In consequence, there has not been an update on the dam's operational storage capacity curves. In this research, new operational curves were established for the reservoir based on a recent bathymetric survey undertaken in 2014. The reduction in reservoir capacity during the period between 1959 and 2014 was calculated by the mean of the difference between the designed storage capacity and the storage capacity which was concluded from the 2014 bathymetric survey. Moreover, the rate of sediment transported to the reservoir was calculated based on the overall quantities of accumulated sediment and the water discharge of the Lesser Zab River into the reservoir. The results indicate that the dam capacity is reduced by 25% due to sedimentation of an estimated volume of 367 million cubic metres at water level 480 m.a.s.l. The annual sedimentation rate was about 6.6 million cubic metres, and the sediment yield was estimated to be 701.2 t∙km−3∙year.

  • Vallejos, Leopoldo
    Luleå University of Technology, Department of Arts, Communication and Education, Education, Language, and Teaching.
    Inkluderingsarbetet i förskolan: Vad det är och vad det betyder för barn med ett annat modersmål2020Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    I det här arbetet tas betydelsen av förskolans inkluderingsarbete upp men också flerspråkighetens inverkan på detta. I uppsatsens inledning beskrivs bakgrunden för intresset för detta inkluderingsarbete och varför det är viktigt att genomföra. I arbetet får man läsa om vad inkludering är, ta del av tidigare forskning inom området, begrepp som kan associeras med inkludering, vad arbetet ska utgå ifrån. Arbetet utgår från ett sociokulturellt perspektiv och en kvalitativ forskningsmetod används för att besvara de uppsatta frågorna i arbetet. Guidelinjer för att använda sig av intervjun som datainsamlingsmetod tas också upp. Vidare tas de etiska ställningstaganden som är viktiga att ha vid genomförande av intervjuer upp för att sedan beskriva genomförandet som kan kort sammanfattas med att intervjuer genomfördes med en pedagog inom en viss verksamhet samt med en pedagog som arbetar ihop med andra verksamheter. Detta så att samma arbete kan utföras av andra. Urval för deltagare i intervjun, bearbetning och analysmetod tas vidare upp. Skrivningen avslutas med arbetets resultat, diskussionsdel samt en implikationsdel och till sist förslag till fortsatt forskning. Sammanfattningsvis tas utfallet av arbetet och varför det inte blev som förväntat och vad det kan bero på upp här.

  • Zernell, Mikaela
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences.
    Design of a Ski Mountaineering Helmet2020Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This is a master thesis project in Industrial Design Engineering at Luleå University of Technology performed during the spring semester 2019 and with the goal to design a helmet for POC specialized for ski mountaineering.

     

    To cope with new rules in ski mountaineering competitions, to widen the product catalogue of POC and to make ski mountaineering safer and more enjoyable, a double certified helmet was to be designed, meaning certified for both mountaineering and downhill skiing. The end goal with the project was a product concept fully ready to be prototyped and tested for both EN 12492 – mountaineering helmets and EN 1077 – ski helmets standards.

     

    Theories relevant to the project has been researched, they include head injuries, manufacturing methods, anthropometry, and safety certifications. Some takeaways from these were that head injuries in ski mountaineering can be severe or deadly, but can be mitigated by using a helmet, helmets are usually produced by expanding plastic beads into a shock absorbing material, by expanding the beads more, the shock absorbing material gets a lower density, and by expanding them less the material gets a higher density, an easy way to design a helmet that fits well on most people’s heads is to use headforms, and that an easy way to design a helmet that can be EN1077 and EN12492 certified is to use similar dimensions as existing helmets with the same certifications.

     

    Methods used in the project has been: a survey asking users for insight and opinions; analysis of the brand POC; competition research; observations; idea generation - including 6-3-5 and body storming; and creation and evaluation of prototypes.

     

    The project has resulted in information about user’s experiences of SKIMO helmets, users wants and needs, an analysis of POC products, ideas, prototypes for testing functionality, clay models for exploring shape, a concept decision and last but not least, a CAD model and a prototype of the final concept.

    The survey results together with some observations could be summarized as three problems to solve and six features the helmet should have.

    1. Temperature Change.

    2. Ventilation holes makes goggle foggy when worn on the on the forehead.

    3. The third problem is created as a combination of the EN 1077 standard penetration test for ski helmets and the users need for “extremely good ventilation”.

     

    Requested features were:

    1. The users want to be able to where sun glasses in a passive position on top of the helmet.

    2. They want head lamp attachment.

    3. It should look good.

    4. Side straps for goggles are requested.

    5. It should be colourful so that it’s easy to detect in the mountain terrain.

    6. And of course, it needs to be lightweight.

     

    The result is a SKIMO helmet I chose to call POC Ibex. It’s a helmet with a double layer EPS liner with multiple functions. It allows for ventilation to the forehead without fogging up the goggles and helps withstanding penetration tests while still having big ventilation holes. It has Magnetic removable ear pads, that can be attached without removing the helmet.

    It’s made from EPS and PC and on the top, it has an extra thick layer of PC for extra protection against rock fall.

  • Sjölander, Mattias
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
    Numerisk analys för nybyggnation av sugrörsgalleri i Krångede kraftverk2020Independent thesis Advanced level (professional degree), 300 HE creditsStudent thesis
  • Göransson, Therese
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering.
    Från exkludering till inkludering: En studie för att belysa Digitaliseringens baksida2020Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The digital development has since the 1950s given rise to exclusion, but it was not until 1990-2000 that it became a more of a social problem. Digitization grew rapidly and organizations wanted, and still want to take advantage of the benefits that digital funds could create for their organizations, both in recourses as time and money.

    Sweden is one of the countries that are at the forefront of the digital transformation journey, but there is also a back side. The rapid digitization has created a group in the society that has been excluded, which is over a one million people large. This group is represented by people who can also be considered having socially barriers in society based on factors such as age, education, functional variation, unemployment and loneliness.

    The purpose of the study was to shed light on this digital exclusion as a backside of digitalization, get a picture of responsibility, but also to see what work that is in progress today to counter this.

    The study results in responsibility being shared between organizations, private individuals and politicians. Measures are taken today, but not to a sufficient extent. Increased understanding and awareness of what consequences this may entail, which is also exemplified in an interview with a respondent who has been subjected to digital fraud, is required.

  • Gloerfelt-Tarp, Mille
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Digital Services and Systems.
    Rönnberg, Mattias
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Digital Services and Systems.
    Implementering av chattbot i en kundfokuserad kundservice: Behålla det personliga med kundservice hos en chattbot2020Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Digitization continues to accelerate and so does customers’ expectations of businesses and their services. To be able to remain competitive and to maintain pace with the market leaders, high availability and customer service 24/7 is expected. A growing trend to address this requirement is a chatbot. The fear associated with implementing a chatbot is that it may be experienced as cold or impersonal when compared to traditional customer service.

    The purpose of this study is to investigate whether it is possible to maintain the personal characteristics of a human customer service during the implementation of a chatbot. To investigate this, a chat bot was developed which and then iteratively tested at a company in the electricity and energy industry. The method used in this implementation was Design Science Research Methodology (DSRM). In each iteration of development, the personal properties of the chatbot were tested against the company's customer service.

    The result of the study shows that there is an opportunity to maintain humanity to a certain extent through several identified factors. The most important factors that have been identified are response delay, making sure the word choices align with company values and target audience, as well as follow-up questions that take previous context into account.

  • Mohammad, Mohammad E.
    et al.
    Al-Ansari, Nadhir
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Knutsson, Sven
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Laue, Jan
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    A numerical study of pumping effects on flow velocity distributions in Mosul Dam reservoir using the HEC‐RAS model2020In: Lakes & Reservoirs: Research and Management, ISSN 1320-5331, E-ISSN 1440-1770Article in journal (Refereed)
    Abstract [en]

    Water flow direction and velocity affect and controls erosion, transport and deposi- tion of sediment in rivers, reservoirs and different hydraulic structures. One of the main structures affected is pumping stations within the dams wherein the velocity distribution near the station intake is disturbed. The two-dimensional (2-D) HEC-RAS 5.01 model was utilized to study, analyse and evaluate the effects of pumping rates and flow depth on the flow velocity distribution, flow stream power and their effects in the Mosul Dam reservoir. The pumping station was considered as a case study. The station is suffering from sediment accumulation around, and in, its intake and suction pipes. The main inflow sources to the reservoir are the Tigris River and run-off from the valleys within its basin. The reservoir was divided into two parts for the present study, including the upper part near the pumping station (analysed as a two-dimen- sional zone), while the lower part was analysed as a one-dimensional flow to reduce the simulation period computation time (1986–2011). Different operation plans (i.e. pumping rate and water depth) were considered. The results of the depth-averaged velocity model indicated that when the pumping station was working at a range from the designed full capacity (100% to 25% of its full capacity), the maximum flow ve- locity increased from 75 to 4 times the normal velocity when there is no pumping dependent on pumping rate and flow depth. For the same operation plans, the flow stream power varied from around zero values to 400 times at full pumping capacity and low flow depth. For sediment routing along the reservoir, the considered statisti- cal criteria indicated the model performance in estimating the total sediment load deposition and invert bed level is much better than in the case of erosion and deposition areas for different considered bed sections of the reservoir.

  • Liljegren, Anni
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences.
    Koncept till campingbutik: Förbättringsarbete av campingbutik med fokus på platsinnovation2020Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Detta projekt har gjorts i Leksand, 2019, som ett examensarbete för en kandidatexamen i Teknisk design. Anledningen för att detta arbete görs är att förbättra en campingbutik på Leksands Strands camping med fokus på platsinnovation. Då jag själv jobbat i butiken och varit ansvarig för den i tre somrar är detta ett projekt för att hjälpa mig och företaget att utveckla butiken för att göra den mer attraktiv för både gäster och personal. Teorin har fokuserat mycket på turism, platsinnovation samt marknadsföring och delar i platsens identitet. Metoderna i detta projekt har handlat om att hitta och analysera fakta och sedan använda metoder som moodboard och persona för att kunna framföra resultatet om hur butiken ska designas och förbättras. Resultatet utgick från platsinnovationens tre byggstenar; Gestaltning, Innehåll och Marknadsföring. Var del har förslag på förbättringar som alla smälter ihop till ett enda stort förbättringsförslag. I sista delen av denna rapport diskuteras resultatet och frågeställningar samt syfte och mål besvaras.

  • Malik, Anurag
    et al.
    Department of Soil and Water Conservation Engineering, College of Technology, G.B. Pant University of Agriculture and Technology, Pantnagar, Uttarakhand, India.
    Kumar, Anil
    Department of Soil and Water Conservation Engineering, College of Technology, G.B. Pant University of Agriculture and Technology, Pantnagar, Uttarakhand, India.
    Kim, Sungwon
    Department of Railroad Construction and Safety Engineering, Dongyang University, Yeongju, Republic of Korea.
    Kashani, Mahsa H.
    Department of Water Engineering, Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Ardabil, Iran.
    Karim, Vahid
    Department of Water Engineering, Faculty of Agriculture, University of Tabriz, Tabriz, Iran.
    Sharafati, Ahmad
    Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran.
    Ghorban, Mohammad Ali
    Department of Water Engineering, Faculty of Agriculture, University of Tabriz, Tabriz, Iran.
    Al-Ansari, Nadhir
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Salih, Sinan Q.
    Institute of Research and Development, Duy Tan University, Da Nang, Vietnam.
    Yaseen, Zaher Mundher
    Faculty of Civil Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam.
    Chau, Kwok-Wing
    Department of Civil and Environmental Engineering, Hong Kong Polytechnic University, Hong Kong, People’s Republic of China.
    Modeling monthly pan evaporation process over the Indian central Himalayas: application of multiple learning artificial intelligence model2020In: Engineering Applications of Computational Fluid Mechanics, ISSN 1994-2060, E-ISSN 1997-003X, Vol. 14, no 1, p. 323-338Article in journal (Refereed)
    Abstract [en]

    The potential of several predictive models including multiple model-artificial neural network (MM-ANN), multivariate adaptive regression spline (MARS), support vector machine (SVM), multi-gene genetic programming (MGGP), and ‘M5Tree’ were assessed to simulate the pan evaporation in monthly scale (EPm) at two stations (e.g. Ranichauri and Pantnagar) in India. Monthly climatological information were used for simulating the pan evaporation. The utmost effective input-variables for the MM-ANN, MGGP, MARS, SVM, and M5Tree were determined using the Gamma test (GT). The predictive models were compared to each other using several statistical criteria (e.g. mean absolute percentage error (MAPE), Willmott's Index of agreement (WI), root mean squared error (RMSE), Nash-Sutcliffe efficiency (NSE), and Legate and McCabe’s Index (LM)) and visual inspection. The results showed that the MM-ANN-1 and MGGP-1 models (NSE, WI, LM, RMSE, MAPE are 0.954, 0.988, 0.801, 0.536 mm/month, 9.988% at Pantnagar station, and 0.911, 0.975, 0.724, and 0.364 mm/month, 12.297% at Ranichauri station, respectively) with input variables equal to six were more successful than the other techniques during testing period to simulate the monthly pan evaporation at both Ranichauri and Pantnagar stations. Thus, the results of proposed MM-ANN-1 and MGGP-1 models will help to the local stakeholders in terms of water resources management.

  • Elmanius, Leona
    et al.
    Luleå University of Technology, Department of Health Sciences.
    Benitez, Sonja
    Luleå University of Technology, Department of Health Sciences.
    För- och nackdelar med mobil datortomografi vid akut diagnostik - En litteraturöversikt2020Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Introduction: For patients in need of urgent medical care, the time to diagnosis and treatment is an important factor. The role of the X-ray nurse is important in emergency diagnostics as they are responsible for conducting X-ray examinations. Today, mobile X-ray services, primarily conventional X-ray examinations, are for instance available for unstable patients. These services offer rapid diagnosis, but many urgent issues require examinations using a computed tomography (CT). Aim: The aim of this study was to compile the pros and cons of mobile CT in acute care diagnostics. Method: The study was conducted as a literature review. A systematic literature search was conducted in three medical databases. In total, ten quantitative articles were quality-reviewed and analyzed. Results: It appears in the results that the advantages of a mobile CT are several, such as reduced time for the diagnosis and treatment and reduced workload for the healthcare personnel. A mobile CT also counteracts transport-related complications in high-risk patients. However, it also states that the disadvantages, such as increased radiation dose, inferior image quality and increased costs, should be taken into account. Conclusion: The mobile CT has been shown to increase patient safety, which is an important factor in healthcare. The device, despite its drawbacks, has a great potential to facilitate diagnostics in patients in critical situations. Hopefully, this device will be further developed to be used regularly.

  • Malin, Gawell
    et al.
    Södertörns högskola.
    Lindberg, Malin
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Humans and technology.
    Truls, Neubeck
    Ideell Arena.
    Innovationslabb för social inkludering: Erfarenheter från Vinnova-finansierade projekt2020 (ed. 1)Book (Other academic)
    Abstract [sv]

    I boken presenteras en analys av erfarenheterna från tio projekt som finansieras inom Vinnovas utlysning ”Social innovation mot segregation – finansiering av innovationslabb för ökad inkludering” under perioden 2017-2019. Analysen bygger på projektledarnas erfarenheter av att leda och organisera innovationslabben, som dokumenterats genom workshops, enkät och projektmaterial. Rapporten är framtagen inom ramen för det kunskapsstöd som letts av Ideell Arena i samarbete med Södertörns högskola och Luleå tekniska universitet.

  • Asplund, Emma
    et al.
    Luleå University of Technology, Department of Health Sciences.
    Johansson, Rosa
    Luleå University of Technology, Department of Health Sciences.
    Faktorer som påverkar det korta mötet med personer med demenssjukdom: En litteraturöversikt2020Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Introduction: For radiographers, expertise is required to be able to meet patients with different types of needs, including patient with dementia and their specific needs. This specific patient group often feel insecure and anxious and this is exacerbated in hospital environments. Therefore, radiographers face special challenges when it comes to providing persons with dementia with the optimal and safe care they need. Aim: The aim of this literature review was to identify which factors that affect the short meeting in the care of people with dementia. Method: The study was conducted as a qualitative literature review. A systematic search in the databases PubMed and CINAHL resulted in 9 articles that were quality checked and analyzed. The results were presented as categories. Results: Six different factors affected the short meeting of persons with dementia; communication, person-centred care, knowledge, time, environment & organization and relatives. Conclusion: All these factors are of great importance for the care of persons with dementia. To be able to meet this patient group with dignity more time is required. Time allows for better communication and more person-centred care. More research is needed on the short meeting in the radiology department as it is lacking in the literature. It would have been of great interest and importance to know how the radiographers best can meet the needs of this patient group despite the lack of time in the short care meeting.

  • Bocké, Åsa
    Luleå University of Technology, Department of Health Sciences.
    ”Hand reach star excursion balance test”: Assessment of dynamic functional mobility in female elite team gymnasts in relation to overuse injuries2020Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Background

    Clinical usable assessment methods to quantify mobility, balance, stability and postural control functions together in a full kinetic chain movement are sparse. Normative data of such dynamic functions in different group of athletes are  still lacking and therefore the relationship between dynamic functional mobility and overuse injuries are also unknown. The prevalence of overuse injuries among adolescent athletes are continuously high and team gymnastic is one example of a sport with multiple and underestimated overuse injuries.

     

    Aim

    The first aim of study was to establish normative data of dynamic functional mobility in a group of elite team gymnasts. The second aim was to investigate ongoing overuse injuries and evaluate associations between ongoing overuse injuries and dynamic functional mobility in the group.

     

    Method

    A descriptive cross sectional study including 31 female elite team gymnasts 16-19 years old were conducted. “The hand reach star excursion balance test” (HSEBT) was used to measure dynamic functional mobility in 20 different movement patterns. The "Oslo Sports Trauma Research Center Overuse Injury Questionnaire"(OSTRC) was used to record and analyse severity of ongoing overuse injuries in the group. Pearson correlation analysis was used to determine the relationship between the scoring in the HSEBT- tests and scoring on the OSTRC.

     

    Results

    A majority of the participants presented with scores near the maximum values on the HSEBT. Further,  97% of the subjects had an ongoing overuse injury. Severe injuries, affecting participation in sport were present in 67%. Correlations was found between prevalence of severe injury in the lower back and lower scoring on the right leg in a rotational movement pattern (r= -0,42) whereas prevalence of severe injury in the hip was associated with extreme high mobility in a sidebending pattern in both legs (r= 0,50, 0,49). There was also a relationship between individuals with multiple severe overuse injuries and dynamic functional mobility in an extended movement pattern of the left leg (r= -0,36, -0,38).

     

    Conclusion

    Normative data of dynamic functional mobility according to the HSEBT can provide clinicians with reference points to compare elite female team gymnasts. There was an indication of association between limited mobility in some of the included tests and prevalence of overuse injuries in the lower back and hip. This study included a small sample and therefore conclusions have to be interpreted carefully.