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  • 301.
    Alsyouf, Imad
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Alzghoul, Ahmad
    Luleå University.
    Soft computing applications in wind power systems: a review and analysis2009In: European Offshore Wind 2009 Conference proceedings, 2009Conference paper (Other academic)
    Abstract [en]

    This paper reviews, analyses, discusses and summarises the recent research and development and trends in the applications of soft computing in the field of wind power systems. We show the usage and the influence of soft computing on the different aspects of wind power systems especially in the field of operation and maintenance. This work provides the state of the art in this area which will be a good guidance for future research work. The main results achieved from the study show that the soft computing techniques are adequate for solving the different challenges at the different phases of the life cycle processes of wind power systems.  Using the various soft computing techniques with wind power systems proved to be useful for the wind energy business. Using these tools contribute by improving the robustness of the decisions at different phases of the system's life cycle. Soft computing can enhance the efficiency and effectiveness of the operation and maintenance of offshore wind power systems through improving the availability levels. Thus, providing secure, sustainable and competitive energy supply for the future.

  • 302.
    Altergren, Andreé
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Förberedelse till modernisering av styrsystem för produktion av processvatten2012Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The heat and power station Allöverket in Kristianstad produced the process water in a plant called the total desalination. In this plant which consists out of two identical lines, they let the incoming water passing through ion exchangers to replace the undesired ions in the water to more desired ions. The reason for doing this is that the undesired ions in the water give coatings on the turbine. When the ion exchangers have been saturated, they must be restored to the original condition. This is done by starting a regeneration program, which consists of a number of steps such as back flushing, intake of chemicals and four different flushes. There are limits on the conductivity and the content of silicon in the water that will be delivered. But there is only measurement of the conductivity connected to the control system, and because of this they control the plant with different timers. To the control system there is connected a number of centrifugal pumps, solenoid valves and instrumentation for measurement of conductivity. In the total desalination sits a Siemens S5 control system that controls the plant after amount of water, conductivity and different times of the sequences. The control functions are now located on a control cabinet out of the factory. The Siemens S5 control system is old and outdated and will be changed to an ABB 800xA control system. This control system they already use to control other parts of the factory from the control room. With this study I have developed a new functional description of the plant and it consists of function diagrams which describes how the software controls the plant today. To the function description, I have also made a new technical description and revised the process scheme so that all documentation of the plant says the same thing.

  • 303.
    Altgen, Michael
    et al.
    Aalto Univ, Finland.
    Willems, Wim
    FirmoLin Technol BV, Netherlands.
    Hosseinpourpia, Reza
    Linnaeus University, Faculty of Technology, Department of Forestry and Wood Technology.
    Rautkari, Lauri
    Aalto Univ, Finland.
    Hydroxyl accessibility and dimensional changes of Scots pine sapwood affected by alterations in the cell wall ultrastructure during heattreatment2018In: Polymer degradation and stability, ISSN 0141-3910, E-ISSN 1873-2321, Vol. 152, p. 244-252Article in journal (Refereed)
    Abstract [en]

    There is a complex link between the water sorption behavior and the presence of accessible hydroxyl groups in the wood cell wall, which can be altered by heat-treatment (HT). This study analyses the effect of changes in the cell wall ultrastructure caused by two HT techniques on the hydroxyl accessibility, water vapor sorption and dimensional changes of Scots pine (Pinus sylvestris L.) sapwood. HT of wood in pressurized hot water at 120-170 °C was applied to cause the preferential bond cleavage, whereas HT of wood in oven-dry state in superheated steam at 180-240 °C was performed to create additional covalent cross-links within the cell wall matrix. Removal of cell wall polymers by HT and water leaching reduced the oven-dry dimensions of wood and enhanced the cellulose aggregation during drying. Cellulose aggregation restricted the cell wall shrinkage in circumferential direction, resulting in inhomogeneous shrinkage of the cell wall with only little changes in lumen volume by HT. Cellulose aggregation also reduced the water-saturated dimensions, but a decrease in swelling was only achieved when additional cross-links were formed by HT in dry state. Additional cross-links in the cell wall matrix also resulted in an additional reduction in water sorption at 25 °C and 93% RH. However, this was not caused by a further reduction in the hydroxyl accessibility. Instead, cross-linking was shown to reduce the amount of accessible OH groups that are simultaneously active in sorption, which was explained based on the concept of sorption of water dimers at hydroxyl group pairs at high RH levels.

  • 304.
    Altsäter, Erik
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Lagerstyrningssystem för ökad flexibilitet2009Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This degree project has been performed at Production unit 1 (PV1) at Wexiödisk AB, where hood type washing machines is manufactured. The purpose of this project has been to investigate which inventory control models that could be suitable to control the section’s material supplies. The work has been accomplished in two steps. At first, items unique to products manufactured at PV1 were treated, followed by items common with other products. According models in relevant literature, suggestions were made to how the models could be applied practically. The suggestions was presented to and discussed with the parties concerned who chose Two-bin system 2. A trial was carried out according to the principle of “the Japanese river” which implied lowered inventory levels. The problems that occurred were noted. The result was that the number of items that was weekly picked and distributed was reduced which has created a basis to also reduce the administration of the systems picking lists. The item wagon has been removed which has cleared floor space at the assembly section. Conditions have been created to merge two picking lists into one and thereby simplify the work for the inventory staff.

  • 305.
    Alvarez, Claudio
    et al.
    University of Los Andes, Chile .
    Milrad, Marcelo
    Linnaeus University, Faculty of Technology, Department of Media Technology.
    Borie, Francisco
    University of Los Andes, Chile .
    Luna, Martín
    University of Los Andes, Chile .
    CollPhoto: A Paper + Smartphone Problem Solving Environment for Science and Engineering Lectures2014In: Collaboration Technologies and Social Computing: 7th International Conference, CollabTech 2014, Santiago, Chile, September 8-10, 2014. Proceedings / [ed] Takaya Yuizono; Gustavo Zurita ;Nelson Baloian ;Tomoo Inoue; Hiroaki Ogata et al. (Eds):, Springer, 2014, p. 1-15Conference paper (Refereed)
    Abstract [en]

    Recent studies in science and engineering education support that inductive learning activities encouraging active student involvement may improve students’ motivation, development of soft skills and academic performance, compared to traditional lectures. Until recently, several technology-enhanced learning environments have been proposed to facilitate such activities in classrooms. However, these commonly depend on dedicated hardware devices, such as clickers or tablet PCs. Contrastingly, smartphones are being massively adopted by society as these become increasingly powerful and inexpensive. Even so, the use of smartphones as learning tools in lecture halls has still not been widely adopted. In this paper we present CollPhoto, a paper-plus-smartphone environment that supports face-to-face problem solving activities in the classroom. CollPhoto provides the instructor with instant visibility of students’ work, and facilitates him/her conducting discussions, based on a selection of students’ responses. We report on the design and initial validation of CollPhoto in the context of two computer science courses.

  • 306.
    Alvarsson, Johan
    et al.
    Linnaeus University, Faculty of Technology, Kalmar Maritime Academy.
    Sjöström, Victor
    Linnaeus University, Faculty of Technology, Kalmar Maritime Academy.
    Konvertering av Kraftringens geotermianläggning: Undersökning av alternativ till köldmediet R134a2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In the geothermal plant of 'Kraftringen' the refrigerant R134a, which is a fluorescent greenhouse gas with relatively high GWP (Global Warming Potential), circulates. When the new F-Gas regulation was introduced in 2015, it resulted in a significant price increase for high-pressure GWP refrigerants. 'Kraftringen' therefore wants to investigate which conversion options there are for R134a, partly to reduce costs, but also to minimize the climate impact of the business.

     

    Different refrigerants have been compared with regard as to how they affect the plants performance. Moreover, it has been investigated which refrigerants are in the correct pressure range with regard to what the plants compressor and pipes are designed for. The survey has been done by performing theoretical calculations based on measured values from when the heat pumps operate at maximum load. In the refrigerant selection process, the same evaporation and condensation temperature as during the measuring was used.

     

    In the study we found two refrigerants, R152a and R450A, which would serve as conversion options in terms of them being in the correct pressure and temperature range. Both options have lower GWP and a higher heat factor than the current refrigerant R134a. However, R152a is flammable and has a higher degree of safety than the other two refrigerants.

  • 307.
    Alvunger, Per-Olof
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    Yrkeskunnandets problematik: En studie i yrkeskunnande2014Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Denna essä handlar bland annat om det dilemma som finns mellan rollen som yrkesarbetare och lärarrollen. Essän är ett försök av mig att titta på mitt eget yrkeskunnande och kika på några andras berättelser för att försöka hitta nyckelord, analogier och olika exempel som kanske kan leda till en fördjupad förståelse vad ett yrkeskunnande handlar om. Syftet med denna essä är att se om jag lyckas att hitta de nyckelord som jag förknippar med yrkeskunnande och om dessa ord kan återfinnas i andras berättelser. Jag berättar om olika möten jag har haft med människor och redogör för händelser i mitt liv som påverkat mitt eget kunnande. Jag har med några människors berättelser och de redogör för erfarenheter som har påverkat deras kunskap på något sätt.

  • 308.
    Al-Yakoubi, Murad
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Roham, Elias
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Underhåll och övervakning av distributionstransformatorer2012Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Följande projekt går i korthet ut på att avgöra om användning av kylsystemet i en transformatorstation är relevant, om det minimerar temperaturhöjningen orsakad av effektförlusterna som transformatorn avger. Arbetet ska resultera i förslag på val av transformatorer samt beskriva dess egenskaper. Vidare vill vi finna lösningar kring problemet med överhettning i transformatorstationerna och att de generella kraven såsom låg ljudnivå och tillräcklig ventilation (för att ta bort den värmeförlust som de inre komponenterna avger) skall uppfyllas.  För att kunna ge olika förslag på val av transformator i transformatorstationerna har vi på Holtab AB utfört olika beräkningar som visar skillnad för pris, kvalitet, livslängd och egenskaper (effektförluster, energiförluster).

  • 309.
    Amatya, Suyesh
    et al.
    Linnaeus University, Faculty of Technology, Department of Computer Science.
    Kurti, Arianit
    Linnaeus University, Faculty of Technology, Department of Computer Science.
    Cross-Platform Mobile Development: Challenges and Opportunities2013In: ICT Innovations 2013: ICT Innovations and Education / [ed] Vladimir Trajkovik and Misev Anastas, Springer, 2013, 1, p. 219-229Chapter in book (Refereed)
    Abstract [en]

    Mobile devices and mobile computing have made tremendous advances and become ubiquitous in the last few years. As a result, the landscape has become seriously fragmented which brings lots of challenges for the mobile development process. Whilst native approach of mobile development still is the predominant way to develop for a particular mobile platform, recently there is shifting towards cross-platform mobile development as well. In this paper, we have performed a survey of the literature to see the trends in cross-platform mobile development over the last few years. With the result of the survey, we argue that the web-based approach and in particular,hybrid approach, of mobile development serves the best for cross-platform development. The results of this work indicate that even though cross platform tools are not fully matured they show great potential. Thus we consider that cross-platform development offers great opportunities for rapid development of high-fidelity prototypes of the mobile application.

  • 310.
    Ambrosius, Robin
    Linnaeus University, Faculty of Technology, Department of computer science and media technology (CM).
    Machine Learning Based Optimizations for Bot Aided Interviews: In the Field of Due Diligence2018Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Startups need investments in order to scale their business. The value of such startups, especially software-based startups, are difficult to evaluate because there is no physical value that can be judged.  The company DueDive built experience in due diligence by conducting many interviews in this area, which are the base for the due diligence. These interviews are time consuming and require a lot of domain knowledge in the field, which makes them very expensive. This thesis evaluated different machine learning algorithms to integrate into a software that supports such interviews process. The goal is to shorten the interview duration and lowering the required know know for the interviewer using suggestions by the AI. The software uses completed interview sessions to provide enhanced suggestions through artificial intelligence. The proposed solution uses basket analysis and imputation to analyze the collected data. The result is a topic-independent software that is used to administrate and carry out interviews with the help of AI. The results are validated and evaluated in a case study using a generic, self-defined interview.

  • 311.
    Amoateng, Eric
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    COMPUTATION OF THE ARC LENGTH FROM THE SHADOW BOUNDARY OF A CAD OBJECT2012Independent thesis Advanced level (degree of Master (Two Years)), 80 credits / 120 HE creditsStudent thesis
    Abstract [en]

    CAD objects are geometrical descriptions of physical scenes from the real world. Ray tracing is used to project the objects onto a pixel screen. A lit and a shadow zone are formed according to the direction of the incoming field (light) and the orientation of the pixel screen. The arc length along the surface of the object, from the shadow boundary to a point in the lit zone, is computed by means of numerical integration. The arclengths corresponding to two orthogonal directions that are aligned with the pixels on the pixel screen are computed and used for interpolation to obtain the arc length for all directions. A number of simulations for various CAD geometries are made using a ray-tracer implemented in FORTRAN 90.

  • 312.
    Anderchen, Silvia
    et al.
    Linnaeus University, Faculty of Technology, Department of Informatics.
    Charvát, Martin
    Linnaeus University, Faculty of Technology, Department of Informatics.
    User Perspective of Privacy Exposure on Facebook: An Examination of Risks Perception Among University Students in Sweden2016Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Social media become a powerful communication medium for effective online social interaction globally. The use of various social networking sites has integrated into people’s daily lives especially among young adults. Problem arises when personal information is used without individuals’ involvement and relevant privacy risks increased. The main focus for the thesis is to investigate privacy perception and risks knowledge of Facebook usage among university students in Sweden. Based on this focus, the research identifies the key reasons that students decide to use and still use Facebook despite of privacy risks. The study also explores how user perspective of privacy affects the utilization of Facebook. The adopted methodology is qualitative research through the methods of interview and Facebook data analysis among ten young adult students at Linnaeus University in Sweden. As result, the research has identified seven concepts and three special outcomes to answer the research questions. Through the analysis, we have recognized weak perception of privacy risks among university students. Although users claim they are privacy concerned yet large amount of private information is shared on Facebook. The findings have shown that users are somewhat willing to accept certain part of potential privacy risks and personal information usage by different parties, in exchange for benefits and needs of online interaction in today’s modern society. Users believe the shared personal information on Facebook is under control and they can prepare for possible consequences. However, we believe that people’s needs for popular online social interaction outweigh privacy concerns. We suggest that it is significantly important for social networking sites’ users to balance benefits and risks, in order to maintain balanced usage and positive effects of online personal privacy. In the end of the thesis, we have suggested two future research directions based on our research topic.

  • 313.
    Andersen, Henrik
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Speldesignsmönster bland populära sociala nätverksspel: En kartläggande studie över hur användningen av speldesignsmönster i sociala nätverksspel skiljer sig från andra digitala spel.2010Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Idenna uppsats granskades de fem populäraste sociala nätverksspelen på den sociala nätverkstjänsten Facebook. Syftet var att genom att studera speldesignsmönster urskiljaeventuella skillnader mellan sociala nätverksspel och andra digitala spel. Dessa skillnader analyserades för att kontrollera om de kunde vara bidragande faktorer till sociala nätverksspels popularitet. Avslutningsvis skapades och lanserades två spelprototyper där den ena utrustades med några av de spelmönster som uppmärksammats i undersökningen, medan den andra spelprototypen helt saknade dessa spelmönster. De båda spelprototyperna lanserades samtidigt på den sociala nätverkstjänsten Facebook.

  • 314.
    Andersen, Mattias
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Claeson, Martin
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Utvärdering av ett nyutvecklat samverkansbjälklag och dess utvecklingspotential2008Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    I dagens byggnader ställs allt högre krav på stora rum och öppna ytor vilket ger efterfrågan på ökad spännvidd hos bjälklagen. Detta är svårt att klara av med traditionella träbjälklag. För att ändå få ett lätt bjälklag undersöks möjligheten att kunna fördela ut bjälklagets belastning i två riktningar. Bjälklaget ska alltså vara fyrsidigt upplagt. För att lösa detta har en idé uppkommit som går ut på ett samverkansbjälklag mellan trä och plåt. Detta bjälklag ska i bärriktning 1 bära genom fackverkan medan det i bärriktning 2 ska bära genom balkverkan. För att ett fyrsidigt upplagt bjälklag ska fungera krävs att sambandet mellan kraft och deformation är likvärdigt i båda riktningarna.

    Examensarbetets uppgift har varit att tillverka provkroppar för att undersöka sambandet mellan kraft och deformation i både bärriktning 1 och bärriktning 2. Provning utförs för att se om bjälklaget har förutsättningar att kunna användas i praktiken.

    Efter provning av bjälklagsprovkropparna konstaterades att det finns möjligheter att gå vidare med produkten och fortsätta utvecklingsarbetet. För de provkroppar som provades i bärriktning 1 och 2 var sambandet mellan kraft och deformation nära identisk upp till 7,5 kN då mittnedböjningen var ca 10 mm.

  • 315.
    Andersen, Michael Styrk
    et al.
    University of Southern Denmark, Denmark.
    Brandt, Anders
    University of Southern Denmark, Denmark.
    An alternative to the flutter derivatives2016In: BBAA VIII, 8th International Colloquium on Bluff Body Aerodynamics and Applications, Northeastern University, Boston, Massachusetts, USA, June 7-11, 2016: colloquium proceedings, Boston: Northeastern University, College of Engineering , 2016Conference paper (Refereed)
    Abstract [en]

    A new simplified framework to study flutter and assess the full scale flutter wind speed is suggested. The flutter instability problem is reduced from a problem involving 8 flutter derivatives to only 4 coefficients. With this method it is possible to estimate the self-excited forces with increased precision by using stability diagrams. Furthermore, the physical transparency of the aerodynamic damping and stiffness terms is increased because the development in vertical and torsional damping and stiffness is analysed instead of flutter derivatives.

  • 316.
    Andersen, Michael Styrk
    et al.
    University of Southern Denmark, Denmark.
    Johansson, Jens
    University of Southern Denmark, Denmark.
    Brandt, Anders
    University of Southern Denmark, Denmark.
    Hansen, Svend Ole
    University of Southern Denmark, Denmark ; Svend Ole Hansen ApS, Denmark.
    Aerodynamic stability of long span suspension bridges with low torsional natural frequencies2016In: Engineering structures, ISSN 0141-0296, E-ISSN 1873-7323, Vol. 120, p. 82-91Article in journal (Refereed)
    Abstract [en]

    Classical flutter of suspended bridge decks can be avoided if the torsional frequencies are lower than the vertical. Wind tunnel tests of single boxes and twin box section models with torsional natural frequencies above and below the vertical frequency has been conducted. Flutter was avoided in all tests where the torsional frequency was lower than the vertical. But too low torsional stiffness caused large static displacements of the girder at medium–high wind speeds and steady state oscillations driven by a combination of torsional divergence and stalling behavior at the critical wind seed. In order to design aerodynamically stable suspension bridges with low torsional natural frequencies it is suggested to increase the mass moment of inertia and provide adequate torsional stiffness by the main cables spacing.

  • 317.
    Anderson, Helén
    et al.
    Jönköping University.
    Lindström, Göran
    Uppsala University.
    Blombäck, Anna
    Jönköping University.
    Dahlin, Peter
    Jönköping University.
    Janhager, Jenny
    KTH, Integrerad produktutveckling.
    Lage Hellman, Jens
    Chalmers.
    Olofsson, Christer
    Swedish University of Agricultural Sciences.
    Olsson, Annika
    Lund University.
    Olsson, Magnus
    Lund University.
    Svengren Holm, Lisbeth
    Lund University.
    Ölundh Sandström, Gunilla
    KTH, Integrerad produktutveckling.
    Skapa kundnärvaro i innovationsprocessen2008In: Innovationsförmåga / [ed] Annika Olsson, Malmö: Holmbergs i Malmö AB , 2008, p. 40-59Chapter in book (Other (popular science, discussion, etc.))
  • 318.
    Andersson, Adam
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Faaborg, Emil
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Philipsson, Peter
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Utveckling av insteg för dumper2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Detta examensarbete är utfört i samarbete med dumpertillverkaren Volvo CE i Braås. Då dumpern framförs i hård terräng är det nedersta insteget fäst i två stålvajrar vilket gör det flexibelt. Då flexibiliteten in mot maskinen idag är större än företaget önskar undersöks det i detta arbete alternativ till dagens lösning. Detta görs med hjälp av ingenjörsverktyget ”Eight Steps to Getting Design Right” vilket är en produktutvecklingsmetod som gör det lätt för läsaren att följa utvecklingen från idé till färdig produkt. Arbetet resulterade i att två nya lösningar togs fram. En lik dagens, som bygger på att lösningen är flexibel i två led samt har en styvare vajer jämfört med den på dagens lösning. Den andra lösningen, tänkt som tillvalslösning bygger på leder som innanför ett robust skal är kopplat till en kraftkälla som gör det möjligt för steget att fällas upp och ned.

  • 319.
    Andersson, Alexander
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Bergman, Carl
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Underlag för fördelaktig upphängning av kylvattenledningar i en äldre byggnad2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Arbetet redovisar möjligheterna att hänga upp tyngre vattenledningar i en äldre industrilokal där en äldre byggnadsstandard användes vid uppförandet.

    Ett flertal alternativ har tagits fram och där de mest lämpade har arbetats vidare genom att jämföra fördelar och nackdelar.

  • 320.
    Andersson, Amanda
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Jönsson, Frida
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Effektivisering av produktion på producerande företag.: Fallstudie på Eksjöhus AB.2016Independent thesis Basic level (professional degree), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [sv]

    Studien har utförts på Eksjöhus AB för att öka förståelsen för hur produktion kan effektiviseras med hjälp av produktionsteknik. Företaget står inför en snabbt ökad efterfrågan och behöver effektivisera sin produktion för att kunna möta kommande utmaningar. Vid studier av nuvarande läge konstaterades att produktionens väntetider är mycket långa, samtidigt som mycket material transporteras långa sträckor och hanteras på ett sätt som enligt Lean Production benämns som slösaktigt. Genom fyra förbättringsförslag har ledtiden på en teoretisk nivå kunnat reduceras med cirka 20 procent.

  • 321.
    Andersson, Anders
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Nilsson, Börje
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Acoustic Transmission in Ducts of Various Shapes with an Impedance Condition2008In: International Conference on Numerical Analysis and Applied Mathematics 2008, AIP, Melville, USA , 2008, p. 33-36Conference paper (Refereed)
    Abstract [en]

    Propagation of acoustic waves in a two-dimensional duct with an impedance condition at the boundary, is studied. The duct is assumed to have two ends at infinity being asymptotically straight, but otherwise to be arbitrarily shaped.The so called Building Block Method allows us to synthesize propagation properties for ducts with complicated geometries from results for simpler ducts. Conformal mappings can be used to transform these simple ducts to straight ducts with constant cross-sections.By using recently developed techniques for numerical conformal mappings, it is possible to construct a transformation between an infinite strip and an arbitrarily shaped duct with smooth or piecewise smooth boundary, keeping both smoothness and the well controlled boundary direction towards infinity that the above mentioned method requires.To accomplish a stable formulation of the problem, we express it in terms of scattering operators. The resulting differential equation is solved using wave splitting and invariant embedding techniques. We expand the involved functions in Fourier series, and hence, it is possible to give the operators a matrix representation. Numerical results are produced using truncated matrices.

  • 322.
    Andersson, Anders
    et al.
    Jönköping University.
    Nilsson, Börje
    Linnaeus University, Faculty of Technology, Department of Mathematics.
    Biro, Thomas
    Jönköping University.
    Fourier Methods for harmonic scalar waves in general waveguides2016In: Journal of Engineering Mathematics, ISSN 0022-0833, E-ISSN 1573-2703, Vol. 98, no 1, p. 21-38Article in journal (Refereed)
    Abstract [en]

    A set of semi-analytic techniques based on Fourier analysis is used to solve wave-scattering problems in variously shaped waveguides with varying normal admittance boundary conditions. Key components are the newly developed conformal mapping methods, wave splitting, Fourier series expansions in eigenfunctions to non-normal operators, the building block method or the cascade technique, Dirichlet-to-Neumann operators, and reformulation in terms of stable differential equations for reflection and transmission matrices. For an example, the results show good correspondence with a finite element method solution to the same problem in the low- and medium-frequency domains. The Fourier method complements finite element analysis as a waveguide simulation tool. For inverse engineering involving tuning of straight waveguide parts joining complicated waveguide elements, the Fourier method is an attractive alternative including time aspects. The prime motivation for the Fourier method is its added physical understanding primarily at low frequencies.

  • 323.
    Andersson, Andreas
    et al.
    Linnaeus University, Faculty of Technology, Kalmar Maritime Academy.
    Lindquist, Karin
    Linnaeus University, Faculty of Technology, Kalmar Maritime Academy.
    Fördjupning i skadestatistik inom sjöfarten: En analys av anmälda arbetsolyckor 2011 – 2013 utförd på uppdrag av Sjöfartens Arbetsmiljönämnd2015Independent thesis Basic level (degree of Bachelor), 10 HE creditsStudent thesis
    Abstract [en]

    The purpose of this thesis was to analyse the reported work-related accidents in shipping by using frequency combined with consequence. Thereafter the purpose was to reach conclusions regarding which work-related accident was the most serious. The thesis also aimed to find if there were any connections between these accidents. Statistics were ordered from the Swedish Work Environment Authority. These statistics were processed in several ways, for instance demarcations regarding position onboard was made. Since the conditions of reporting workrelated accidents had changed during time, relevant years was chosen after consideration. The result of the study shows that when a person experiences an accident where he or she stumbles, trips, slips or treads heavily, the person is more likely to have a long sick-leave. These types of accidents are also the most common ones. To lose control of equipment or to lose control of equipment used to move material is also a common accident leading to a long sickleave. The only connection found is that the external factor hawser is present at several accidents with different consequences and cause.

  • 324.
    Andersson, Anneli
    et al.
    École Polytechnique of Montréal, Canada.
    Laurent, Patrick
    École Polytechnique of Montréal, Canada.
    Kihn, Anne
    Université Libre de Bruxelles, Belgium.
    Prévost, Michèle
    École Polytechnique of Montréal, Canada.
    Servais, Pierre
    Université Libre de Bruxelles, Belgium.
    Impact of temperature on nitrification in biological activated carbon (BAC) filters used for drinking water treatment2001In: Water Research, ISSN 0043-1354, E-ISSN 1879-2448, Vol. 35, no 12, p. 2923-2934Article in journal (Refereed)
    Abstract [en]

    The impact of temperature on nitrification in biological granular activated carbon (GAC) filters was evaluated in order to improve the understanding of the nitrification process in drinking water treatment. The study was conducted in a northern climate where very cold water temperatures (below 2°C) prevail for extended periods and rapid shifts of temperature are frequent in the spring and fall. Ammonia removals were monitored and the fixed nitrifying biomass was measured using a method of potential nitrifying activity. The impact of temperature was evaluated on two different filter media: an opened superstructure wood-based activated carbon and a closed superstructure activated carbon-based on bituminous coal. The study was conducted at two levels: pilot scale (first-stage filters) and full-scale (second-stage filters) and the results indicate a strong temperature impact on nitrification activity. Ammonia removal capacities ranged from 40 to 90% in pilot filters, at temperatures above 10°C, while more than 90% ammonia was removed in the full-scale filters for the same temperature range. At moderate temperatures (4–10°C), the first stage pilot filters removed 10–40% of incoming ammonia for both media (opened and closed superstructure). In the full-scale filters, a difference between the two media in nitrification performances was observed at moderate temperatures: the ammonia removal rate in the opened superstructure support (more than 90%) was higher than in the closed superstructure support (45%). At low temperatures (below 4°C) both media performed poorly. Ammonia removal capacities were below 30% in both pilot- and full-scale filters.

  • 325.
    Andersson, Anton
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Persson, Johan
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Effektivisering av en produktionsprocess: Med hänsyn till materialförsörjningen2016Independent thesis Basic level (professional degree), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [sv]

    Fallstudiens syfte är att studera ett fallföretags produktionsprocess samt deras materialförsörjning för att få en bättre uppfattning om vilka faktorer som påverkar effektiviteten. Målet är att leverera en layout som ska leda till att upplärningsprocessen blir kortare, att flexibiliteten ökar samt att man får en taktad produktion. Teori och insamlad empirisk data har analyserats noggrant för att komma fram till en slutsats och för att kunna ge rekommendationer på eventuella förbättringsmöjligheter till fallföretaget. Både för och nackdelar till rekommendationerna har diskuterats för att de skulle bli så relevanta som möjligt för fallföretaget.

  • 326. Andersson, B L
    et al.
    Carlsson, Bo
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Monitoring of climatic/environmental data at the Swedish National Testing Institute in Borås1989Report (Other academic)
  • 327.
    Andersson, Caroline
    et al.
    Linnaeus University, Faculty of Technology, Kalmar Maritime Academy.
    Eklund, Henrik
    Linnaeus University, Faculty of Technology, Kalmar Maritime Academy.
    Toxiska luftföroreningar ombord på fartyg: Riskbedömning av svensk ombordpersonals yrkesmässiga exponering för toxiska luftföroreningar2016Independent thesis Basic level (degree of Bachelor), 10 HE creditsStudent thesis
    Abstract [en]

    The main purpose of this study was to measure and evaluate the air quality onboard two Swedish ships, and compare the results with the exposure limits laid out by the Swedish Work Environment Authority (Arbetsmiljöverket) and the Swedish population’s exposure to various substances. The results of this study were also meant to be helpful to form new advice and recommendations to minimize exposure and also to provide material for future studies.

    During approximately one week onboard the two ships data were collected using passive samplers to register levels of benzene, nitrogen dioxide and polycyclic aromatic hydrocarbons.

    The results indicated that the air quality onboard the two ships were generally good. All measured concentrations were well below safety applications and it did not differ very much neither between ships nor compared with the Swedish population’s exposure. In conclusion, Swedish sailors onboard Swedish ships are not in greater danger of toxic air pollutants onboard compared to when they are at home.

  • 328. Andersson Chan, Anneli
    Biofiltration of Odorous Gas Emissions2006Doctoral thesis, comprehensive summary (Other academic)
  • 329.
    Andersson Chan, Anneli
    City of Växjö, Sweden.
    Experience with Anammox Sludge Liquor Treatment and up-coming Challenges with Thermal Hydrolysis Effluents at The Sundet Wastewater Treatment Plant, Vaxjo Sweden2015In: Water and Energy, Washington June 8-10 2015, 2015Conference paper (Refereed)
  • 330.
    Andersson Chan, Anneli
    Växjö kommun, Sweden.
    Increased nitrogen removal in existing volumes at the Sundet wastewater treatment plant, Växjö2013Conference paper (Refereed)
    Abstract [en]

    The HELCOM Baltic Sea Action Plan is an ambitious program to obtain good ecological status of the Baltic marine environment by 2021. Sweden has a preliminary commitment to reduce nitrogen by 21 000 ton, partly from the wastewater sector (3 000 ton nitrogen), and due to this many wastewater treatment plants need to improve their nitrogen removal. On top of that, the incoming load of nitrogen is increasing due to rising protein consumption. Co-digestion of external substrates (often rich in nitrogen) with wastewater sludge for increased biogas production further contributes to higher nitrogen loads. Increased nitrogen removal capacity often means more bioreactor volumes, which can be very expensive and sometimes impossible if space is limited. Therefore, there is a need for compact hybrid solutions that can increase capacity within existing volumes.

    The Sundet WWTP in Växjö received a new environmental permit in 2010 for 95 000 pe. Emission criteria for treated water are 10 mg BOD7/l, 0.2 mg P/l, and 60% nitrification. During a five year evaluation period (2012- 2016) assessments to ensure 15 mg N/l in the effluent should be conducted. To increase the nitrogen removal capacity within existing volumes, two processes using MBBR technology with plastic carriers were chosen:

    • Increased nitrification capacity in the existing activated sludge system through the Hybas™ combination process of MBBR and activated sludge (Integrated Fixed-Film Activated Sludge, IFAS).

    • Separate biological treatment of sludge liquor with the AnitaMox™ process, using autotrophic Nremoval through anaerobic ammonium oxidation (anammox) in a one-stage process with carriers.

    One of the six treatment trains was rebuilt to fit the integrated fixed-film activated sludge process for improved nitrification. The anoxic zone in this train was doubled for improved denitrification capacity. Data collected onsite from over a year (from October 2011 to present) are analyzed and compared with the performance of a conventional activated sludge train operated in parallel.

    The Hybas trained nitrified more consistently than the reference train, with effluent concentrations <1 mg NH4- N/l for most of the time. To keep the nitrification capacity in the reference train during the winter, a higher MLSS concentration was required, as well as larger aerated volumes. This lead to inadequate denitrification, while the capacity was substantially higher in the Hybas train, with emission concentrations well under the objective of 15 mg N/l. No additional carbon was added to the system. Practical experiences concerning operational requirements and challenges of the Hybas process (air flow and hydraulic loading, carrier management, and nutrient limitations) are discussed in the paper.

    The existing sludge liquor treatment (SBR, sequence batch reactor) was retrofitted in 2011 to an AnitaMox process. Thanks to a seeding start-up strategy, the process reached full capacity with more than 90% ammonia removal within two months from start-up. By applying a nitrogen loading strategy to the reactor that matches the capacity of the seeding carriers, more than 80% nitrogen removal could be obtained throughout the start-up period. Full-scale experiences from more than a year has proven AnitaMox to be an energy- and cost efficient nitrogen removal process compared to the previous SBR process, and at the same time robust and relatively simple to operate. However, an increased process control and more on-line instruments require resources and qualified personnel.

    These two full-scale demonstration projects have been a successful learning experience in identifying and correcting both process and operational issues, which may not have arisen at pilot scale. The set objectives in terms of nitrogen removal were met for both processes and design modifications will improve the future operation at the Sundet WWTP.

  • 331.
    Andersson Chan, Anneli
    Växjö kommun, Sweden.
    Sustainable Biogas Production in the Greenest City in Europe2015In: IBIO 2015 - BIT's 8th World Congress of Industrial Biotechnology, Nanjing China April 25-28, 2015Conference paper (Other (popular science, discussion, etc.))
  • 332. Andersson Chan, Anneli
    et al.
    Johansson, N
    Christensson, Magnus
    Växjö - a holistic approach to increased biogas production2013In: Sludge Management and Anaerobic Digestion in a Broad Holistic System Perspective, 6-8 May 2013, Västerås, Sweden., 2013Conference paper (Refereed)
  • 333.
    Andersson Chan, Anneli
    et al.
    Växjö kommun, Tekniska förvaltningen, Sweden.
    Johansson, Niklas
    Växjö kommun, Tekniska förvaltningen, Sweden.
    Christensson, Magnus
    AnoxKaldnes, Lund, Sweden.
    Increased nitrogen removal in existing volumes at Sundet wastewater treatment plant, Växjö2014In: Water practice and technology, E-ISSN 1751-231X, Vol. 9, no 2, p. 215-224Article in journal (Refereed)
    Abstract [en]

    Many wastewater treatment plants need to improve their nitrogen removal due to stricter requirements and increasing loads. This often means larger bioreactor volumes, which can be very expensive and is sometimes impossible if space is limited. Therefore, there is a need for compact hybrid solutions that can increase capacity within existing volumes. Two full-scale demonstration projects using moving bed biofilm reactor (MBBR) technology has proven to be an efficient way to treat nitrogen in existing volumes at Sundet wastewater treatment plant in Växjö. Increased nitrification and denitrification capacity in parts of the main stream were demonstrated through the Hybas™ process, a combination of MBBR and activated sludge using the integrated fixed-film activated sludge technology. The ANITA™ Mox process, using autotrophic N-removal through anaerobic ammonium oxidation (anammox), provided high nitrogen removal for the sludge liquor. Data collected on-site for over a year are analyzed and compared with the performance of conventional treatment systems. These two full-scale demonstration projects have been a successful learning experience in identifying and correcting both process and operational issues, which may not have arisen at pilot scale. The set objectives in terms of nitrogen removal were met for both processes and design modifications have been identified that will improve future operation at Sundet WWTP.

  • 334.
    Andersson, Christopher
    et al.
    Linnaeus University, Faculty of Science and Engineering, Kalmar Maritime Academy.
    Karlsson, Emil
    Linnaeus University, Faculty of Science and Engineering, Kalmar Maritime Academy.
    Energieffektivisering till sjöss: Inom linjetrafik2012Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Denna studie handlade om att undersöka vilka energireducerande metoder som åtta svenska rederier inom linjetrafiken har valt att tillämpa ombord på sina fartyg. Detta för att kunna ge en bild om vilka eventuellt nya system och metoder framtida sjömän står inför. Metoden som användes var genom ett utskickat frågeformulär där berörda rederier kunde svara på frågor angående deras energibesparingar. Även rederiernas hemsidor undersöktes för att kunna få en djupare insikt om vilka energibesparande metoder rederierna använde sig av. Sedan söktes vidare information om dessa energibesparande metoder för att kunna ge en beskriva dem. Slutsatsen som drogs av studien visade att nästan alla undersökta rederier tillämpar någon form av energibesparande åtgärder, men endast fyra av de tillfrågade åtta nämnde att de hade visioner som de strävade efter att uppnå. Studien hade en låg svarsfrekvens vilket kan indikera på att rederierna antingen inte vill dela med sig av sin energipolicy, eller så är denna policy helt avsaknad.

  • 335.
    Andersson, Daniel
    et al.
    Linnaeus University, Faculty of Technology, Kalmar Maritime Academy.
    Petter, Andersson
    Linnaeus University, Faculty of Technology, Kalmar Maritime Academy.
    Frikyla: En möjlighet för Östersjöfarten att spara energi?2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    To maintain a comfortable climate on board ships, cooling is necessary during the warm period of the year which requires energy. This thesis is a survey about whether so-called free cooling could reduce this energy consumption. The ROPAX-ferry Finntrader trafficking the route Malmö–Travemünde has been used as an example.

    This survey was carried out by creating a calculation model in which a brine system with a possibility of free cooling was connected to Finntrader’s current HVAC-system, alongside the current chillers. Statistics of air temperature, air humidity and sea water temperature was acquired for the period 2013-2015 and were inserted into the calculation model. These calculations showed that a certain amount ofenergy could be saved with free cooling, how much depending on the effectiveness of the heat exchangers.

    The amount of energy that could be saved was quite small compared to the cost of the components required by the model.

  • 336.
    Andersson, Fredrik
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Jönsson, Henrik
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Förbättrad precision vid ankomstkontroll2008Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Examensarbetet utfördes på Balco AB i Växjö, som tillverkar och erbjuder balkongsystem på

    totalentreprenad. Eftersom Balcos ökade omsättning har lett till att ankomstrollen inte längre kan utföras med

    tillräckligt hög precision, så har produktionsplaneringen blivit lidande. Syftet med projektet var därför att Balco

    ska kunna ankomstrapportera inkomna aluminiumprofiler från underleverantörer på ett smidigt sätt, samt med

    hög precision.

    För att lösa Balcos problem vid ankomstkontrollen, så att de enkelt kan rapportera in och få en god översikt

    av ankommit gods, har projektgruppen kommit fram till tre olika alternativa lösningar. Dessa lösningar är

    streckkodssystem, RFID-system och manuell identifiering. För bästa resultat, och användning av

    identifikationssystemen, är det troligtvis nödvändigt att ett MPS-system implementeras.

    Slutsatsen och rekommendationerna innefattas främst av en lösning med ett streckkodssystem, men där den

    primära nyckeln till ökad precision och kontroll av ankommande gods ligger i att införa ett väl fungerande

    datasystem.

  • 337.
    Andersson, Frida
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Karlsson, Joakim
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Utveckling av tätningskoncept till TeijoViverk ABs industritvättmaskiner2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Arbetet redovisar en utvecklingsprocess av TeijoViverk ABs tätningskoncept. Tätningskonceptet delas in i tre stycken konceptdelar; Infästningskoncept, Tätningsytakoncept och Tätningslistkoncept. Av de koncept som tagits fram till varje del har en utvärdering gjorts mellan de olika koncepten och ett gemensamt förslag för dessa har tagits fram.

  • 338.
    Andersson, Hanna
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Vattenhaltmätning i konfektyr och sylt med Karl Fishermetoden2006Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Abstract (in English)

    The task for the diploma work was to develop methods for measuring of moisture content by the Karl Fischer method, in jam, jelly sweets, and fudge.

    The start premises was a for the company whole new equipment, which should be started up. Then programs should be developed for different kind of samples.

    In the task it was as well included to develop methods for dissolving the different kind of samples, since the Karl Fischer method demands completely dissolved sample material.

  • 339.
    Andersson, Hans
    Linnaeus University, Faculty of Technology, Department of Media Technology.
    Visualisering av avatarens hälsa och dess effekt på spelarens prestation: En studie av in-game information i det grafiska gränssnittet2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    As digital gaming technology has evolved and the games has become more advanced, the amount of information that the player can get about their avatar (the player's digital representation) has increased. Depending on the layout and design of the game, this information is more or less readily available. The information that always seems to have a more or less evident place in HUD (static parts of the graphical interface) is the avatar's state of health. There are several guidelines on how to visualize this information, but game designers are constantly exploring new ways to apply it. Pros and cons of how the information is implemented is discussed by players and game journalists in several forums. Frequently focusing on what it does for the game's challenge and the gaming experience.Previous research that attended the avatar's health has investigated how different mechanics behind the graphic visualization affect the gaming experience. However, there is a research gap when it comes to how the graphic visualization of the avatar's health affects the player's performance.This study examines how a player's performance is influenced by obtaining information about the avatar's health through the graphical interface. The study is based on an ongoing discussion of how the mechanics of the avatar's health and its visualization affects the game's challenge.A literature study was conducted on the subject game design focusing on how the graphic interface of a game should be designed. After that, a game prototype was developed for the study in which the literature study formed the basis for how a graphic representation of the avatar's health was implemented. In the prototype, functionality was added to completely exclude the graphic representation of the avatar's health every other time the game started. Functionality was also applied in the prototype to collect data during the game. The data was saved in a database set up for the study.With use of the two game modes of the prototype, a qualitative preliminary study was conducted in the form of supervised game sessions with follow-up semi-structured interviews. A comparative study was conducted by letting half of the participants play with a visible health bar and the other half without. The participant's reasoning on issues related to the research question was analyzed to give a deeper understanding of the quantitative data that was collected by making the prototype available through the web.After each completed game of the prototype, it was registered alongside the score if the game had been played with a visible health bar or not. Other information intended to answer the research question for the study was also registered. After the preliminary study was conducted the prototype was published on the web, this resulted in data from 259 game rounds was collected and stored in the database. After selection according to study delimitations, data from 62 game rounds have been used for the for the study's quantitative research backing.To conclude, the results differ between the qualitative and the quantitative studies. During the qualitative study, a distinction was made in the reasoning between those who played with a visible health bar and those who had been playing without. This was used to analyze and compare the collected data from the web-based prototype. The collected quantitative data, however, does not show any statistically safe difference in performance between those who played with a visible health bar and those who played without one.

  • 340.
    Andersson, Helena W.
    Linnaeus University, Faculty of Technology, Department of Forestry and Wood Technology.
    Utvärdering av metoder för att mäta mental arbetsbelastning hos skotarförare - vid delautomatiserat och konventionellt kranarbete i simulatormiljö2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Forward operators are subjected to both physical and mental workload in their work and a way to reduce mental workload and increase productivity is to automating the crane movement. To enable study the impact of automation you need methods to estimate the forwarder operators mental workload in conventional crane work and with semi automation. This study evaluated the psychophysiological parameters; trapezius muscle activity, heart rate, heart rate variability, respiratory rate, skin conductance and finger temperature. To ensure the validity and methodology reliability one need to perform more extensive studies. As for future studies this work propose additional studies of forward operator mental workload in the simulator environment regarding heart rate, heart rate variability and respiration.

  • 341.
    Andersson, Helena W.
    et al.
    Linnaeus University, Faculty of Technology, Department of Forestry and Wood Technology.
    Rickardson, Anders
    Linnaeus University, Faculty of Technology, Department of Forestry and Wood Technology.
    Timmerkvalitet hos björk i blandskog med gran2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Birch is the dominant deciduous tree species in Sweden but only 16 % is found in pure birch stands. The majority of the birch (51 %) is to be found in conifer dominated stands. Swedish forest land comprises approximately of 23 % mixed stands and one problem is that for mixed stands there are few management recommendations. The underlying aim of this thesis was to study the management of mixed forest stands of spruce and birch to achieve good timber quality of birch. The study was based on a literature study and measurement in a field experiment launched in 1998 by the Swedish University of Agricultural Sciences (SLU). This study indicates that it is possible to achieve good timber quality of birch in mixed stands of birch and spruce. However, it requires that birch in mixed stands with spruce should be managed similar to management programs of pure birch stands.

     

    Keywords: Birch, spruce, timber quality, mixed stands.

     

  • 342. Andersson, I
    et al.
    Bylander, S A
    Wernståhl, K
    Carlsson, Bo
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Routines for calibration and control of equipment for artificial weathering testing at the Swedish National Testing Institute1989In: Proc. of Colloquium on Artificial Weathering, SP Nov, Borås, Sweden, 1989Conference paper (Refereed)
  • 343. Andersson, J
    et al.
    Bjurström, Henrik
    Azoulay, M
    Carlsson, Bo
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Experimental and Theoretical Investigation of the Kinetics of the Sorption of Water Vapour by Silica Gel1985In: Journal of the Chemical Society, Faraday Transactions 1: Physcal Chemistry in Condensed Phases, Vol. 81, p. 2681-2692Article in journal (Refereed)
    Abstract [en]

    The kinetics and mechanism of the sorption reaction between water vapour and silica gel have been investigated in the pressure range 1–50 Torr using thermogravimetry under controlled temperature and water-vapour pressure. Measurements at equilibrium were carried out in order to determine the pertinent equilibrium parameters and the extent of hysteresis. The influence of particle radius and temperature on the kinetics in the whole of the pressure range investigated are well described by theoretical curves fitted to experimental data by taking into account simultaneous mass- and heat-transfer. Calculations yield a diffusivity of 8 × 10–10 m2 s–1. The sorption kinetics in the pressure range 15–40 Torr are shown to be controlled by heat transfer. 

  • 344.
    Andersson, Jenny
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Malin, Enbom
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Hur ökas implementering av visuella arbetssätt inom Skanska?2015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Visuella arbetssätt har visat sig vara effektivt inom byggbranschen. Studien omfattar de visuella arbetssätt som Skanska använder sig av; visuell styrning och visuell projektering. Syftet med studien är att öka antalet projekt som väljer att implementera arbetssätten. Därav har underliggande problem identifierats varför inte projekt väljer att implementera arbetssätten i den utsträckning som Skanska önskar.

    Det har visat sig under studiens gång att visuell projektering har implementerats i större utsträckning än visuell styrning, detta för att visuell projektering har ett mer utvecklat underlag. En jämförelse av verktygens implementering har gjorts.

  • 345.
    Andersson, Jesper
    et al.
    Linnaeus University, Faculty of Technology, Department of Computer Science.
    Caporuscio, Mauro
    Linnaeus University, Faculty of Technology, Department of Computer Science.
    Aligning Architectures for Sustainability2016In: ACM Proccedings of the 10th European Conference on Software Architecture Workshops (ECSA-W) / [ed] Rami Bahsoon and Rainer Weinreich, ACM Press, 2016, article id 13Conference paper (Refereed)
    Abstract [en]

    The digitization of industry has drastically changed the competitive landscape by requiring a higher degree of specialization and shorter time to delivery that affect the design properties a software platform should satisfy. The platform architecture must sustain continuous and rapid change to the organizational architecture, which in turn is affected by external forces: i.e., forces drive the velocity of change. In this paper, we explore the effects of digitization, characterizing internal and external forces that impact on business strategies and trigger the continuous realignment of the platform, and outline a research agenda to mitigate the effects.

  • 346.
    Andersson, Johan
    et al.
    Linnaeus University, Faculty of Technology, Kalmar Maritime Academy.
    Hallgren, Einar
    Linnaeus University, Faculty of Technology, Kalmar Maritime Academy.
    Fartygstrafik genom naturreservat: Salvorev: Östersjöns genväg2017Independent thesis Basic level (university diploma), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Den här studien undersöker hur utsläppen av CO2 samt NOx skulle påverkas av att man tog en längre rutt runt ett Natura 2000 område mellan Gotska sandön och Fårö norr om Gotland i Östersjön. Detta för att undvika att köra i ett natura 2000 området och på så sett minska sjöfartens påverkan på djurlivet där. Med hjälp av AIS data har information tagits fram om hur många fartyg som använder rutten genom natura 2000 området. En sammanställning av vilka typer av fartyg samt dess maskineri har också tagits fram med hjälp av detta. Som ligger till grund för uträkningarna för CO2 samt NOx utsläppen. Studien visar på att CO2 utsläppen kan öka med upp till 4,72 ton genom att köra en längre rutt runt området, även NOx utsläppen ökar, med upp till 0,13ton.

  • 347.
    Andersson, Johan
    et al.
    University of Kalmar, Kalmar Maritime Academy.
    Hjelmqvist, Carl
    University of Kalmar, Kalmar Maritime Academy.
    El-, kylvatten- och hydraulsystem till fiskebåt2008Independent thesis Basic level (professional degree), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [en]

    This project includes the design of cooling, hydraulic, and electrical systems of a small fishing vessel

    (FF Gava) and documentation of those systems. The documentation consists of three parts: description

    of function, fault isolation manuals and lists of components. The major part of this project has been the

    function and construction of those systems and the fitting and integration to already existing

    components.

  • 348.
    Andersson, Josefine
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Svensson, Simon
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Mätning av fuktkvot i sammansatta KL-träelement2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Moisture related damage is an occurring problem in wood-based buildings if the material is exposed to rainfall during construction. Measurement of moisture content can be done with various instruments and methods. The purpose of the thesis is to study change in moisture content in cross-laminated-timber, with prolonged exposure to water in laboratory environment. To advance the field, the Linnaeus University has been developing a measurement instrument of their own in collaboration with the company Saab. The instrument measures electrical resistance in wood where the obtained values will be compared to similar measurements from a product named Gigamodule. The self-developed sensor card is still a product under development. In addition to the lab setting measurements the instrument was also installed in a local building in Växjö.

    To verify the result from the previously mentioned resistance measurers additional instruments and methods have been utilized. Two separate models have been used to represent the detail of the connection between the wall element and the joist. Both models have been submerged under water for an equal amount of time. The experimental setting took place between the 19th of April to the 18th of May 2018. The measurements and calculations have been resulting in values that can be the subject of internal evaluation. Difference in result based on the direction of the grain have been observed in several measurement methods. The CLT-elements demonstrated good drying properties despite periodically high moisture content and the wood indicate a return towards initial levels of moisture.

  • 349.
    Andersson, Klara
    Linnaeus University, Faculty of Technology, Kalmar Maritime Academy.
    Ledarskap till sjöss: Utmaningar med multikulturellt ledarskap ombord i fartyg2018Independent thesis Basic level (degree of Bachelor), 10 HE creditsStudent thesis
    Abstract [en]

    The purpose of this study is to investigate possible challenges regarding multicultural leadership at sea, and to see if these differ from challenges connected to multicultural leadership ashore.

    Considering the special conditions onboard a ship, and based on previous studies and literature, five components for successful multicultural leadership at sea has been identified. These five components have been the base of an interview guide, which has been used to conduct interviews with twelve seafarers onboard a Swedish flagged ship. The seafarers were asked what they consider to be good leadership, their expectations on leadership and how they feel affected by the environment onboard.

    According to the interviews, the seafarers feels that the most important traits for a leader is to be fair, kind and knowledgeable. The seafarers appear to be aware of the expectations connected to their roles onboard, but they do not seem to contemplate that people from different cultures may have different expectations on their role. Based on the literature study and the interviews, one can make out that a ship-specific culture rules the social environment onboard. The crewmembers seem to primarily adapt and adjust to this ship-specific culture, and their own national culture comes in second hand.  In conclusion, the biggest challenge of multicultural leadership at sea is recognized to be the ability to be a fair and kind leader in an isolated and wearying environment.

  • 350.
    Andersson, Magnus
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    Elektronikingenjörens vardag: - ett rymdäventyr2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Masteruppsatsen Elektronikingenjörens vardag - ett rymdäventyr är skriven inom programmet yrkeskunnande och professionsutveckling vid Linnéuniversitetet. Uppsatsen beskriver ett yrkeskunnande som både innehåller avancerade datorsimuleringar och handfasta lödningar av elektriska komponenter, där teori och praktik samverkar. Uppsatsen är skriven i essäform, där händelser och situationer i yrkeslivet utforskas.

    Uppsatsen är skriven för att belysa yrkeskunnandet hos en elektronikingenjör från olika synvinklar; arbetslivet, lärandet och moralen. Genom att behandla tre olika sidor av yrket är tanken att få en större insikt om yrkets helhet. 

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