lnu.sePublications
Change search
Refine search result
3456789 251 - 300 of 776
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 251.
    Ericsson, Stefan
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Evertsson, Torbjörn
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Energideklaration av Svenska kyrkans byggnader i Växjö: utredning, deklaration och fördjupning nattkyla2008Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This diploma work aims to investigate which of the Swedish church’s buildings in Växjö that needs to be energy declared and also to perform an energy declaration of an office building. In the energy declaration there’s also included measures for various energy-saving potential. An in-depth study of night-cooling of the framework has also been performed. This diploma work is divided into three main parts, classification of buildings, carrying out the energy declaration and a depth study of night-cooling of the building’s framework. In the first part buildings where divided into different groups on the basis of activities and type of building and then investigated whether to be energy declaration or not. The objective of this classification of buildings is that the Swedish church will know which of their buildings that’s affected by the law concerning energy declarations. The second part is an energy declaration of an office building. It turns out that there are a lot of energy-saving measures that can be done in the office building. Some of them are only simple measures that don’t require any major interference in the building to be performed. In the third part is carried out an in-depth study of night-cooling of buildings’ frameworks, where heavy and light frames are compared against each other. In order to carry out the comparison the simulation program IDA Climate and Energy was used. The results of the simulation shows no saving of energy as a result of night-cooling of the building frame in the simulated building, which leads to a parameter discussion on how various parameters affecting the profitability of night-cooling.

  • 252.
    ERIK, NORRMAN
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Antimons oxidationstal i sodaglas2004Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [en]

    In this work, the redox-behaviour of antimony in soda-lime glass has bin studied. The aim was to find out how the distribution between different oxidation states (Sb3+ and Sb5+) depended on time and temperature. A part of the work was dedicated to try out methods to analyze antimony in the two oxidation states.

  • 253.
    Eriksson, Emil
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Tillverkning av betongelement: En studie av lönsamheten vid tillverkning i fältfabrik2006Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The suppliers of concrete units have long delivery times at the present situation. To make sure that completion of constructions is not delayed by delivery times, Skanska has been forced to produce its own concrete wall units. The aim of this paper is to find out if it’s profitable for a construction company like Skanska to manufacture concrete units in a temporarily established field factory, rather than buying them from a supplier. The manufacturing and mounting has been studied and the costs have been calculated. The market situation has been investigated by comparing costs and delivery times of several suppliers. The results from the manufacturing and mounting have been compared with the information given by the suppliers, in order to investigate whether Skanskas enterprise is profitable.

  • 254.
    Eriksson, Henric
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    reducing of organic material in tap water and condensation water2005Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [en]

    At OKG in Oskarshamn is a water purification plant located. The water purification plant takes its water from the sea Götmaren, which is located north west of Simpevarp. The purification process consist of two identical lines, each line consist of a flocculation chamber, a flotation basin, two parallel rapid sandfilters and a UV-light aggregate.

  • 255. Eriksson, John
    et al.
    Ormarsson, Sigurdur
    Chalmers University of Technology, Sweden.
    Petersson, Hans
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Adaptive Finite Element Analysis of Non-linear Moisture Flow and Associated Distortion Behaviour in Wood2003In: ADMOS Conference on Adaptive Modelling and Simulation, 2003Conference paper (Refereed)
  • 256.
    Eriksson, John
    et al.
    Chalmers University of Technology.
    Ormarsson, Sigurdur
    Chalmers University of Technology.
    Petersson, Hans
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    An experimental and numerical study of the shape stability in glued columns2005In: European Journal of Wood and Wood Products, ISSN 0018-3768, E-ISSN 1436-736X, Vol. 63, no 6, p. 423-429Article in journal (Refereed)
    Abstract [en]

    The study concerns the question of how the shape stability features of laminated columns of Norway spruce can be improved in terms of twist through optimal orientation of the individual laminates. Both experimental testing and numerical simulations were employed for evaluating twist stability. In all the columns studied, deformations were measured experimentally at different moisture content levels. A number of columns were also selected for numerical analysis in order to obtain a more thorough understanding of the twist behavior involved, their geometries and material properties of interest being determined. The experimental results showed the twist stability of the columns to be highly dependant upon the internal orientation of the individual laminates. It was also found that high quality columns in terms of shape stability could be manufactured, even when the center-core material has a strong twist tendency. The numerical simulations performed were in close agreement with the experimental results.

  • 257.
    Eriksson, John
    et al.
    Chalmers University of Technology .
    Ormarsson, Sigurdur
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design. Chalmers University of Technology .
    Petersson, Hans
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Finite element analysis of coupled nonlinear heat and moisture transfer in wood2006In: Numerical Heat Transfer, Part A Applications, ISSN 1040-7782, E-ISSN 1521-0634, Vol. 50, no 9, p. 851-864Article in journal (Refereed)
    Abstract [en]

    A nonlinear model for analysing heat and moisture flow in wood during drying below the fiber saturation point is presented. The model used considers wood at a macro level without taking the various moisture transports mechanisms at the microscopic level into account. Based on the finite-element method, a coupled system of equations resulting from the adopted heat and moisture transfer equations is established and an iterative scheme is proposed. The numerical procedure is verified by a test example. In a two-dimensional analysis, the influence of the coupling on the combined heat and moisture transfer is studied for a board subjected to a typical kiln-drying condition. How well the results agree with those obtained by introducing a commonly applied simplification is discussed.

  • 258.
    Ernstsson, Christian
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Stål, trä och betong i svenskt kontors- och flerbostadsbyggande: - Nuläge och framtid2003Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [en]

    This diploma-work describes the use, the coices and the future use of the four largests construction materials int he construction industry; steel, wood, pre-cast concrete and cast concrete. These four materials are the leading used in the "new-constructed buildings"-sector and light is spread upon the two building-arts called "office" and "multi dwelling building". A marketshare-analyse and an estimated volume development is accomplished. As a final part of the essay two future scenarois had been carried out to create a picture of what the future might bring based on several drivers which have been detected to affect the use and substitution of the four construction materials. The general opinion seems to be growing anyway, because of the growing interest of pre-cast concrete. The cast concrete is remaining its market shares or decreasing slowly. manu specialists prdict that an increased industrialism will be a future reality for the construction-industry. This will affect wood, steel and pre-casts concrete in a very positive way but less positive for the cast-concrete industry. Other drivers of importance are the increase of hte "light-building-technique", science, environmental cause, laws, "dry-building methods" a.s.o

  • 259.
    Fagius, Erik
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Kommunikation mot bättre motivation: En studie som undersöker hur kommunikation kan påverka motivation på arbetsplatsen2008Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Recently more and more focus has been laid on the importance of motivated employers at their place of work. In this paper it is studied how communication can affect the motivation to work. This happened through a case study where a quantitative research method in form of questionnaires on the building contractor NCC was used, where the four communication factors (feedback, openness, language and media) eventual influence on the four motivation factors goal, meaningfulness, development and well-being, are being studied. The summary showed that all motivation factors and all communication factors except feedback were regarded relatively positive among the employers at NCC. This gave a result saying that mostly the communication factors openness, language and choice of media between management and the employers can affect the motivation to work.

  • 260.
    Fakhoury, Bashar
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Alhamed, Heba
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Life Cycle Cost Based Model For Successful Maintenance Outsourcing Process Case Study2008Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The main purpose of this thesis is to develop a new model which helps the decision maker to rationalize outsourcing decisions based on Life Cycle Cost (LCC) analysis and select the appropriate supplier. The model developed consists of four main phases, as well as a pre-evaluating step, which investigate the organization needs and circumstances. Phase I is an evaluation and calculation phase, it assess whether outsourcing is the right policy to be adopted as a competitive advantage from two perspectives; the strategic evaluation of the outsourcing decision, and the cost savings through the life time of the outsourcing process using LCC. Phase II is supplier's selection; it aims to select the preferred supplier using Multiple Criteria Decision Making (MCDM), as well as identifies performance measures to monitor supplier performance. Phase III is maintain and monitor phase, it aims to keep the process and the supplier under continuous revision and assessment. Phase IV is review phase, it aims to identify if a specified monitored parameter is out of control or at critical levels, and identify the causes. This model contribute in covering the lack in the literature by considering LCC in the outsourcing decision making, as well as providing a structured model that concern about the whole process starting by understanding the organizations need and ends by monitoring and review the outsourcing process.

    The model was validated at one Swedish company, i.e. Kalmar Industries in Ljungby assembly unit, in particular, within the maintenance department. The results of the model validation shows that using LCCA, and risk benefits associated, the preferred alternative is to outsource all the maintenance activities related to ventilation system, these activates involve maintenance personnel, spare parts, and third party to monitor and report the process to authorities. Furthermore, based on LCCA and other suggested criteria and using MCDM, ABB Supplier got the lowest score in MCDM i.e. 36.70% (the lowest LCC along with fulfillment of the qualitative criteria).

    The main result is that; it is possible to employ LCCA in the maintenance outsourcing process to achieve a strategic model valid for decisions taking over the life length of the process. Consequently, the main recommendation for the case company is to outsource these activities and to transfer it to ABB service supplier.

  • 261.
    Fihn, Joakim
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Föränderlighet i nya banor2005Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [en]

    We walk through a jungle of lighting. Is there a new approach, which can be tested?

  • 262.
    Filipsen, Jenny
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Utredning och förbättring av plastkapsyl2006Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Examensarbetet har utförts åt Emballator Växjöplast. Arbetets syfte var att närmare undersöka orsaken till de problem som finns att öppna en av företagets kapsyler till glasflaska. Problemet uppstår vid kylförvaring. I syftet ingick även att göra en jämförelse med en konkurrents kapsyl, som kunden anser fungera bättre. Utifrån resultaten av undersökningen skulle förslag på omkonstruktion tas fram.

    I utredningen kring uppkomsten av det förhöjda öppningsmomentet undersöktes mänskliga faktorn, tidsfaktorn, temperaturfaktorn samt produktionsfaktorn. Utöver dessa faktorer gjordes även en utredning kring kapsylens konstruktion där även en jämförelse med konkurrentens kapsyl utfördes.

    I utredningarna har det framkommit några faktorer som verkar ha en betydande inverkan på kapsylens öppningsmoment.

    1. Grundorsaken till att problemet uppstår är att plast är ett temperaturkänsligt material som krymper vid kyla. Då materialet krymper blir konstruktionen nästa problem.

    2. Kontaktytan i gängorna är, redan vid rumstemperatur, stor jämfört med konkurrentens. Vid kyla, då materialet krymper, blir trycket i kontaktytan större vilket resulterar i större friktion vid öppning av emballaget.

    3. Emballator Växjöplasts kapsyl har en konstruktion där godstjockleken vid gäng-cylinderns fäste med kapsyltaket är stor. Denna konstruktion gör gängcylindern mycket formstabil vilket visat sig ha en nackdel. Konkurrentens kapsyl har en mycket mindre godstjocklek i gängcylindern. Det ger en viss flexibilitet som gör det möjligt för cylindern att töjas något då materialet krymper och momentökningen blir därmed inte lika kraftig.

    4. Momentet som man skruvar åt kapsylerna med vid förslutning är proportionellt mot öppningsmomentet för Växjöplasts kapsyl.

    5. Tiden emballaget varit förslutet innan öppning har också en viss inverkan på öppnings-momentet.

    För att avhjälpa problemet med förhöjt öppningsmoment har följande förslag på ändringar i konstruktionen gjorts:

    1. Sätet för tätningsinlägget, som ger den stora godstjockleken, tas bort och gängan löper genom hela gängcylindern upp i taket.

    2. Gängprofilen rundas något och gängflanksvinkel ökas för att minska kontaktytan med flaskans gänga.

    3. Gängcylinderns diameter minskas något för att kompensera ändringarna i gängprofilen. Detta för att säkerställa att kapsylen håller tätt.

    4. Gängcylinderns höjd ökas för att möjliggöra en konstruktionsvariant med en integrerad tätkona. Tätkonan kan ersätta tätningsinlägg för kapsyler som har lägre krav på täthet.

    Arbetet har gett insikt i svårigheterna kring produktutveckling då problemet hos produkten är svårdefinierat och diffust. I detta fall, då flera faktorer inverkar och materialet är temperaturkäns-ligt, kan det inte säkert sägas att konstruktionsändringarna kommer sänka öppningsmomentet förrän produkten testats.

  • 263.
    Flodman, Anders
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Sadic, Adnan
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Provning av SödraSinus balkars styvhet och SödraSemi bjälklagselement vid statisk last2004Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [en]

    The purpose of this study was to find out whether the stiffness of a particular plank was affected when a groove had been sawn in the plank in accordance with the method for manufacturing of SödraSinus sound plank. The tests were carried out in accordance with the European standard for determination of global modulus of elasticity in bending, on ten 45x220 mm planks of K18 timber before and after the grooves were sawn. The stiffness from the tests was later compared to determine the effect of the sawn grooves.

  • 264.
    Forde, Sean
    et al.
    National University of Ireland, Ireland.
    Hynes, Michael
    National University of Ireland, Ireland.
    Jonson, Bo
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Dissolution of glass compositions containing no added lead in simulated lung fluid2008In: International journal of hygiene and environmental health (Print), ISSN 1438-4639, E-ISSN 1618-131X, Vol. 211, no 3-4, p. 357-366Article in journal (Refereed)
    Abstract [en]

    Six crystal glass compositions containing no added lead were studied with respect to the potential exposure of workers during the cold end working of crystal type glasses. During cutting and grinding of crystal glass, fine dusts are produced. These may be inhaled by the workers with subsequent partial dissolution of the dusts in the lung fluid. In order to provide a measure of the degree of dissolution in the case of the six crystal glass compositions produced in this work the release of antimony, barium, silicon, and bismuth was investigated by passing simulated lung fluid over powdered samples of the crystal compositions having a diameter of ca. 0.5 micron for a period of 21 days. The results show that it is possible to produce durable glass containing no added lead. While the leaching and weathering of the glass compositions studied here could be correlated with the mole ratio of alkali/silica and the degree of depolymerisation of the silica network, the dissolution of silica in simulated lung fluid seems to be independent of this property.

  • 265.
    Forss, Jörgen
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design. Avdelningen för Bioenergiteknik.
    Welander, Ulrika
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design. Avdelningen för Bioenergiteknik.
    Biodegradation of azo dyes by natural microflora from forest residues chips cultivated on Swedish soft wood chips2008In: 16th European Biomass Conference& Exhibition, 2-6 June 2008, Valencia,Spain, ETA-Forence renewable energies , 2008Conference paper (Refereed)
    Abstract [en]

    By use of wood chips as a carrier and coal donator, azo dyes are biodegraded by the native microflora inhabiting forest residues chips from the south east part of Sweden. Due to background emissions from the forest residues chips the microflora are successfully transferred to soft sood chips from Norwegian spruce (picea abis) and Scots pine (pinus sylvestris). The azo dyes used in this study are reactive red 2 and reactive black 5 in combined artifical wastewater. The dyes are at a concentration of 200 mg/l degraded within 20 days with additional yeast extract of 1 g/l and 30 days without.

  • 266.
    FRANK, ENGMAN
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Mätning av Lustgas vid rejektvattenbehandling2004Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [en]

    This study concerns mainly the SBR-reactor (Sequencing Batch Reactor), which is the process were the nitrogen rich reject water from the digested sludge is treated. The task has been to measure possible emissions of dinitrogen oxide from the SBR-process. Estimations made from the samples in this study shows that current production generate emissions of dinitrogen oxide nitrogen in quantities of 17 % of received total nitrogen and 21 % of received ammonium nitrogen to the SBR-process. Compared to reduced total nitrogen the figure is 50 % and compared to the ammonium nitrification it is 31 % (*mean value of reduced nitrogen and nitrification summer –04). Literature shows that ammonia oxidizers cause the production of N2O and NO as the result of biological activity, with a small contribution from autotrophic denitrifiers. Also smaller amounts of NO and N2O are produced as the result of chemical reactions involving unstable nitrification intermediates. In this study however, denitrifiers that under oxygen stress cannot complete the reduction from nitrite to dinitrogen is considered to play a major part. Most of the emission occurred during the low dissolved oxygen (DO) period in the aeration stage. Parameter who favours dinitrogen oxide production is high nitrite concentration, low pH and oxygen levels in the region 0-2 mg/l. The oxygen level is a key factor in controlling the reactions that are carried out by the microorganism. The reject water contains about 80 % ammonium nitrogen and almost 20 % nitrite. The total nitrogen load is 970 mg/l and ammonium concentration is 805 mg/l (*). The pH is normally between 6,5 and 7,5. The mechanisms for the production of NO and N2O remains unclear. When comparing studies in laboratory scale or full scale, considerations must be taken to contamination, temperature, pH, DO level, and production parameters of the SBR-cycle and occurring reactions.

  • 267.
    Fransson, Andreas
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Rosell, Andreas
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    A Model to Enhance Productivity of Manufacturing Process by Improving Material Flow: a Case Study2005Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [en]

    The purpose of this thesis is to develop a model that can be used for enhancing the productivity of a manufacturing process by improving the material flow. In response to this purpose a critical literature review of the available relevant models as well as theories was performed. Consequently, a model was developed. The model can be used to identify measures needed to evaluate the current flow of material, map the manufacturing process, assess and calculate the measures, identify and analyze the possible batch-sizes for improvement, generate alternative layout suggestions, evaluate them, and select the preferred. Based on general system theory, a case study approach was used to test the model at O Malmkvist AB in Sweden, which manufactures fluid handling and filtration equipment. The results are a more suitable batch-size, effective layout and material flow as well as improved lead-time, less work in process inventory levels, better working environment, etc. This thesis contributes by providing a model that gives a structured approach to improvement work and can be applied in all batch producing manufacturing companies that want to improve productivity by integrating the batch-size and layout design as well as practical issues.

  • 268. Fransson, Jonas
    et al.
    Olsson, Axel
    Witten, Thomas
    Blom, Åsa
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Sandberg, Dick (red)
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Svenska barr- och lövträd: - Andvändning och anatomi2007Report (Other academic)
    Abstract [en]

    Swedish softwoods and hardwoods – use and anatomy describe properties

    and macro- and microscopic structures for the most common species in

    Sweden. The softwood species described are pine, spruce and juniper. The

    hardwoods are birch, aspen, alder, beech, oak, ash and maple. The

    physical properties are placed in order of precedence between the different

    species, so that they easily can be compared with each other. Furthermore,

    some examples are given on uses for each species. The work is based on a

    literature survey of Swedish and international literature as well as on own

    studies of wood at a microscopic level. All the species (except aspen, alder

    and maple) are presented with our own pictures taken in a microscope.

    In the first part, the structures of the trees at a macroscopic level are

    described. Macroscopic structures that are described are for example rays,

    annual rings and vessels. This part also describes different cell types and

    the anatomy and chemistry of the cell. In the next part, a collection of

    facts about each species is included. A separation of soft- and hardwood is

    made, and the hardwoods are divided in diffuse-porous, semi-ring-porous

    and ring-porous species.

  • 269.
    Frantz, Åsa
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Limnologen: Inblick i svenskt träbyggande2008Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Between 1874 and 1994, Swedish legislation limited the use of timber in load- bearing structures of residential buildings. The use of timber was prohibited in buildings of more than two storeys. During this period, much of the knowledge of the craftsmen and engineers was lost. Therefore, when legislation changed, there was a large need for regaining old and developing new knowledge in the field of timber construction and timber engineering. The number of multi- storey projects was not very large during the first years. Partly due to that the Swedish government developed a national strategy for the increased use of wood in construction in the beginning of the

    21st century, progress was made in developing new techniques and the number of projects increased. The project Limnologen in Växjö is a good example of the current status of Swedish timber engineering, but also points to the fields where there is still some work to be done.

    This essay reports briefly on the building of wooden houses in Sweden in general, and describes the project Limnologen in particular. Issues like type of contract, stabilization, fire protection and solutions to prevent sound from transmitting are dealt with. Also a description of the development of cross- laminated timber (CLT) and how concepts based on CLT have been developed is given.

  • 270.
    Freidh, Martin
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Winberg, Sebastian
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Anläggningsarbeten för ett vindkraftverk i Karryd2009Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

     

    Vindkraftsindustrin är en starkt växande marknad både Sverige och övriga världen och utbyggnaden ökar hela tiden. Detta ger inte bara arbete åt de företag som tillverkar själva vind-kraftverken utan även för företag inom anläggningsbranschen.

    Skanska väg och anläggning i Växjö har fått en offertförfrågan på uppförande av vägar och fundament för ett vindkraftverk i Karryd. I detta arbete har vi utrett metoder och kostnader för projektet i Karryd. Vi har även undersökt vilka olika typer av fundament som idag används vid uppförandet av vindkraftverk.

    Grunden till detta arbete är att Skanska mer exakt ska kunna uppskatta kostnader för anläggning av vindkraftverk men också få en inblick i vilka fundamentstyper som finns. Vårt resultat är en kalkyl och en tidplan som vi hoppas Skanska ska kunna ha nytta av vid kommande vindkraftprojekt.

  • 271.
    Frisén, Andreas
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    En jämförelse av tub- och tankreaktorer vid selektiv katalytiskt reduktion av kväveoxider2005Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [en]

    Alstom AB is localized in Växjö and supply flue gas purification systems for NOx removal to the market. The technique that is most frequently used today for purification of NOx of flue gas is called selective catalytic reduction (SCR). This method involves ammonia, witch is added to the flue gas before is reaches the catalysts. When the flue gas and the ammonia reach the catalysts there is a reaction on the catalyst surface and the NOx gas in collaboration with ammonia, is turned into nitrogen gas (N2) and water.

  • 272.
    Fritzén, Lena
    et al.
    Växjö University, Faculty of Humanities and Social Sciences, School of Education.
    Gustafsson, Barbro
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Sustainable Development in Terms of democracy - an Educational Challenge for Teacher Education2004In: Learning to Change our World?, Lund: Studentlitteratur , 2004, p. 145-161Chapter in book (Other academic)
  • 273. Fritzén, Lena
    et al.
    Gustafsson, Barbro
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Sustainable development in terms of democracy – an educational challenge for teacher education2005In: Jiaoyu cujin kechixu fazhan. Guoji yanjiu yu shijian de qushi., p. 167-174Article in journal (Refereed)
  • 274.
    Fyhr, Jonas
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Smakrik Måltid: Ett inredningsförslag för Teleborgskolans matsal2007Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 275.
    Fält, Pernilla
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Från 2D till BIM i ett trähusföretag: Transition from 2D-CAD to BIM in a timber frame home company2009Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    A prefabricated timber frame house previously built by Villafabriken AB has been modeled in Autodesk Revit Architectural, a 3D-program based on BIM-technology. This has been done tosee if it’s possible to produce the publications that Villafabriken demands from the designengineer’s work, and examine which possible extra values that may arise compared to traditional 2D-CAD drawing.BIM is short for Building Information Modeling. Everything is stored in a single database and a change in the project file is automatically updated across the project. BIM provides more than just drawings since information from the model can be retrieved in various ways such as lists and quantity schedules.It was possible to produce the publications that Villafabriken demanded using Revit, but BIM doesn’t only mean a new way of drawing, it also require a change in the company’s process were the information from the model is being used.

  • 276.
    Gao Frantz, JUNE YAJUN
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Managing and improving material supply: A supply chain perspective2004Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [en]

    Material supply is the basic element in supply chain. Globalization, consequently geographical distances and culture differences have made the material supply processes more complex and risky. Manufacturers and their suppliers have realized that communication, relationship development, long-term partnering will reduce the total costs through the supply chain pipeline, and win-win business situations can be created.

  • 277. Ghodrati, Behzad
    et al.
    Akersten, Per-Anders
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design. Maskinteknik.
    Kumar, Uday
    Spare parts estimation and risk assessment conducted at Choghart Iron Ore Mine: A case study2007In: Journal of Quality in Maintenance Engineering, ISSN 1355-2511, Vol. 13, no 4, p. 353-363Article in journal (Refereed)
    Abstract [en]

    Purpose – Spare parts needs are dependent on the characteristics of the product in question, e.g. its reliability and maintainability, and the characteristics of the environment in which the product is going to be used (e.g. the temperature, humidity, and the user/operator's skills and capabilities), which constitute covariates. The covariates have a significant influence on the system reliability characteristics and consequently on the number of required spare parts. The main objective of this research study is to evaluate the associated risks (i.e. risk of shortage of spare parts) in estimation of the required number of spare parts due to not considering the characteristics of system operating environment.

    Design/methodology/approach – An event tree is a graphical logic model that identifies and quantifies possible outcomes following an initiating event (non-considering system operating environment in this case) in spare parts planning. In the present research a risk analysis is performed through a new and non-standard event tree analysis. It used an event tree analysis in which the states of organization and managerial decisions took place in risk analysis.

    Findings – In the present study a modified form of event tree analysis was introduced and implemented. In the new version the undesired states were used instead of barriers in combination with events and consequents changes as a safety function in event tree analysis. The output of the event tree analysis shows that there is a considerable operational risk due to losses (production and economical) associated with the non-consideration of the machine working environment.

    Practical implications – In the estimation of the accurate amount of support and spare parts needed for any industrial system/machine, it is strongly recommended to take the product operating environment into account. This can be proved by the event tree risk analysis method used in a modified and non-standard form in the present research. The results of risk analysis can help managers in making accurate decisions for product support and spare part needs in the future.

    Originality/value – Modified event tree analysis is a new approach suggested for visualizing the risk associated with non-considering of system operating environment in required support/spare parts estimation. Visualization of risk in graphics can facilitate correct decision making in spare parts planning.

  • 278. Girhammar, Ulf Arne
    et al.
    Källsner, Bo
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Analysis of influence of imperfections on stiffness of fully anchored light-frame timber shear walls - elastic model2009In: Materials and Structures, ISSN 1359-5997, E-ISSN 1871-6873, Vol. 42, p. 321-337Article in journal (Refereed)
  • 279. Girhammar, Ulf Arne
    et al.
    Källsner, Bo
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Design aspects on anchoring the bottom rail in partially wood-framed shear walls: CIB-W18/42-15-12009In: CIB-W18: Meeting forty-two, Dübendorf, Switzerland, August 2009 / [ed] Rainer Görlacher, Lehrstuhl für Ingenieurholzbau und Baukonstruktionen, Universität Karlsruhe, Germany, 2009Conference paper (Refereed)
  • 280. Girhammar, Ulf Arne
    et al.
    Källsner, Bo
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design. Skog och trä.
    Effect of transverse walls on capacity of wood-framed wall diaphragms2006Conference paper (Other (popular science, discussion, etc.))
  • 281. Girhammar, Ulf Arne
    et al.
    Källsner, Bo
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design. Skog och trä.
    Effect of transverse walls on capacity of wood-framed wall diaphragms: Part 22007In: CIB-W18: Meeting fourty, 2007Conference paper (Other academic)
  • 282. Girhammar, Ulf Arne
    et al.
    Källsner, Bo
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design. Byggteknik.
    Effect of transverse walls on capacity of wood-framed wall diaphragms without tie-downs2008In: 10th World Conference on Timber Engineering, 2008Conference paper (Refereed)
  • 283. Girhammar, Ulf Arne
    et al.
    Källsner, Bo
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Elasto-plastic model for analysis of influence of imperfections on stiffness of fully anchored light-frame timber shear walls2009In: Engineering structures, ISSN 0141-0296, E-ISSN 1873-7323, Vol. 31, no 9, p. 2182-2193Article in journal (Refereed)
  • 284.
    Glarner, Anna
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Alsyouf, Ali
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    A model for selecting a computerized maintenance system: -A case study2007Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of this master thesis is to develop a model for selecting a computerize Maintenance Management

    system CMMS. A literature survey for finding relevant theories using database Emerald was performed. The aim

    of the model is to select the best CMMS and it is a general model that could be used by any company to take the

    right decision for selecting the CMMS.

    In this thesis a case study has been performed for selecting the CMMS. The case company for this case study

    was Hammarplast AB in Tingsryd which is part of HammarplastGruppen. Ten years ago Hammarplast use to be

    very good in their preventive maintenance but since the production became more automatic and the people that

    work with maintenance also work with production development their maintenance have come behind. That is

    why Hammarplast are interested to have a CMMS that would help them to develop their maintenance

    performance.

    Four different CMMS (Movex, Dash vp, Tekla and Tribologen) has been analyzed by the authors. The choosing

    of CMMS was wishes from the case company. From our analyses we recommend Tekla as a CMMS to be used

    in the case company, since it satisfies the demand of the company by focusing on user friendly, cost, planning

    and improvement. But before buying Tekla the case company should try to investigate Movex more carefully.

  • 285.
    Granquist, Kim
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Inomhusmiljö i förskolan: akustik, belysning, värme och ventilation2006Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Vissa befintliga förskolor i Växjö kommun har bekymmer med inomhusmiljön, den upplevs inte ha tillräckligt goda kvaliteter för att klara det antal barn som i dag finns i lokalerna. Bristerna gäller akustikmiljö, belysning, värme och ventilation. Då barnantalet ökar skall lokalerna klara av ljudnivåer, luftföroreningar m.m. från fler antal personer än då de byggdes.

    Arbetsmiljön som kommer av detta gör att barn och personal får ont i öronen och kan få hörselnedsättningar. Stress är ett annat problem som också kan komma ut av detta. Belysning, värme och ventilation är inte tillräckligt anpassad för att skapa en optimal inomhusmiljö i förskolan. Föra att de lokaler som byggs i dag inte skall ge problem om några år bör de anpassas för verksamheten genom att använda sig av bl.a. akustiktak, olika belysningskällor för olika verksamhet. Värme och ventilation bör anpassas för att skapa varma golv och en dragfri inomhusmiljö.

  • 286.
    Gregeby, Erik
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Optimeringsunderlag för anaerob rötning av flytgödsel från nötkreatur2009Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Production potential and basis for optimization of anaerobic digestion with cattle manure was reviewed by examining process stability, gas production and methane content in a laboratory environment via addition of pH buffer and chicken manure with slurry from cattle manure as basic feedstock. Addition of pH buffer facilitated the growth of microorganisms by more rapid increase in methane content and greater quantities of produced methane gas. The effects were high during the growth stage but decreased, during and after, the stationary phase. Addition of chicken manure caused inhibition of the process, probably caused by ammonia inhibition from high nitrogen content in chicken manure.

  • 287.
    Gren, Pierre
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Uppskärningsmaskin: Underlag till CE-märkning2008Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Abstract (in English)

    The work that lead to a CE- marking and the creation of a total drawing foundation on an existing machine carried out on the company Polytec Composites Sweden AB in Ljungby. The company have design an machine that exist in six example that runs in the production. To be able to use the machine the company have to work out a CE-marking. The process that summed up all the document that needs for the machine to make a CE-marking. The documentation includes a total drawing over the machine and a risk analysis performed by a group employers on the company. The computer program that i used to make the drawings is Catia V5. The work that the company and the student performed ended up in a CE-marking of the machine.

  • 288.
    Gruber, Mattias
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Alfredsson, Henric
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Omkonstruktion av en rollators bromssystem2006Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This diploma work project is a product development project which purpose is to redesign a braking system for a walking frame. The system that was developed diverges the force from the user to braking power, and includes a service brake as well as a parking brake. The most important components of the system are a grip handle on where the user holds on to and a braking handle on which the user operates the brake from. The system also includes a power transmission component, braking package and other mechanical components. All of the components wasn’t developed in this project, several off them has been reused from the existing system.

    This product has been developed to meet the requirements and standards presented from the principal, Ahlberg Leber. The needs of the future users have also been to importance of the project. These needs where defined thru a marketing analysis, which took place during the first phase of the project. The results from this were so interesting, not only did it function as a basic data; it also is representing an important part of this projects result.

    During the next phase of the project the product development process took place. You can divide this development work into two separate parts that has developed parallel. The purpose of the first one was to develop the mechanical parts that enable the user to operate the brake. The other one was to design the both handles.

    During the course of the development process two different product development methods have been used to decide the design of the braking operating. The first one was used to design a conceptual solution and the second one was used to determine the final solution. The approach of these methods is to develop several different proposals from which one is selected and moves on to the next phase of the project. During the course of the project several ideas and proposals has been developed and later on documented. According to the developers - these ideas makes the most important part of the result of the project. Since most of them are interesting and has potential, it is curtain that the designers of Ahlberg Leber will have usage of these ideas in the future. Hopefully they will contribute to new ideas of how the product of tomorrow might look like.

    The parking brake of the product that is presented as the final one is to be operated by the use of a button. When the braking handle moves over a certain location, the parking brake is automatically activated and the button is then used to deactivate it.

    The most important result of the grip handle design is that the user may choose between different position of there hands. These positions are preferable in different situations and the options give the user a better chance to cope with the every day life.

  • 289.
    Grund Bäck, Lina
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Jonson, Bo
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Lundstedt, Karin
    The influence of basicity on oxygen activity and antimony oxide fining efficiency in alkali alkaline earth aluminosilicate glasses2009In: European Journal of Glass Science and Technology. Part A: Glass Technology, ISSN 1753-3546, Vol. 50, no 5, p. 241-246Article in journal (Refereed)
    Abstract [en]

    The number of bubbles was monitored in antimony oxide fined R2O-MxOy-SiO2 and R2O-CaO-Al2O3-SiO2 glasses (R = Na, K; M = Ca, Mg, Ba, Sr, Zn, B, Al, Ti, x = 1 or 2, y = 1, 2 or 3) in order to evaluate the fining efficiency. Electrochemical measurements of oxygen activity were used to, in situ, monitor the fining characteristics and conditions in some of the investigated glass melts. The results showed that an increase of the calculated optical basicity was related to an increased number of bubbles in the glass samples. The oxygen activity in the melt during fining decreased with increased optical basicity.

  • 290.
    Grund, Lina
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Jonson, Bo
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Compositional effect on fining and oxygen activity in mixed alkali silicate glasses2007In: ICG 2007: XXI International Congress on Glass, ICG , 2007, p. 320-Conference paper (Refereed)
    Abstract [en]

    Antimony oxide has been used as fining agent for quite some time as a substitute for arsenic oxide in low temperature furnaces, not reaching temperatures high enough to activate sulphate compounds in the fining process. Due to environmentally issues, a substitution of antimony by a less toxic fining agent is becoming more urgent. However, since all the details of the mechanisms of fining/refining with antimony are not fully known, it is necessary to further study the present mechanisms and substitution possibilities.

    This study is done to monitor how changes in glass composition affect the fining result and the oxygen activity of the melt. Numbers of bubbles were determined in order to evaluate the fining efficiency. The oxygen activity measurement is a way to in situ monitor the fining characteristics. Na2O-K2O-CaO-SiO2 glasses were used with constant alkali oxide content but with varying ratio Na2O/K2O. The Sb2O3 content was 0,2 mol% and NaNO3 or KNO3 was added as oxidising agent.

    The oxygen activity has been measured electrochemically, both during the fining process and when the melt was in equilibrium with the surrounding atmosphere. To understand the nitrates contribution to the fining, the oxygen activity was measured in melts both with and without nitrate.

  • 291.
    Grund, Lina
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Jonson, Bo
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Compositional effect on fining and oxygen activity in mixed alkali silicate glasses2009In: European Journal of Glass Science and Technology. Part A: Glass Technology, ISSN 1753-3546, Vol. 50, no 1, p. 62-64Article in journal (Refereed)
    Abstract [en]

    This study monitors, in situ, how alterations of the glass composition affect the results of fining and the oxygen activity (aO2) of the melt. The number of bubbles in annealed glass samples was determined in order to evaluate the fining efficiency. Electrochemical measurement of aO2 was used to monitor in situ the fining charcteristics and conditions of Na2O-K2O-CaO-SiO2 glasses. The glasses investigated had a constant alkali oxide content, but a varying ratio of Na2O/(Na2O+K2O). The Sb2O3 content was o.2 mole-% and NaNO3 or KNO3 was added as oxidising agent in most of the glasses. The results show that the number of bubbles decreases from approximately 1100 to 200 bubbles/ 100 g glass and that aO2 at 1400 deg C increases from 0.2 to 1.2 bar in the glass melt when increasing the Na2O/(Na2O+K2O) ratio from 0 to 1.

  • 292.
    Grund, Lina
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design. kemi.
    Jonson, Bo
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design. kemi.
    Lundstedt, Karin
    Glafo.
    Stålhandske, Christina
    Glafo.
    Fining efficiency and oxygen activity in soda-alkaline earth-silica glasses2008In: Glass - The Challenge for the 21st Century: 9th ESG conference, 2008Conference paper (Refereed)
    Abstract [en]

    Fining and refining, when bubbles are removed from the glass melt, is an important step in glass manufacturing to reach the quality demands. It is well known that the refining does not always work properly if the composition in the glass is altered. There are still questions concerning the mechanisms of refining with Sb2O3, which typically is used in glass industries where the furnaces have limited process temperature.

    This study is done to monitor how changes in glass composition affect the fining efficiency and the oxygen activity of the melt. The specific number of bubbles was determined in the glasses in order to evaluate the fining efficiency. The oxygen activity measurement is a way to in situ monitor the fining characteristics and it has been measured electrochemically at 1400 C in some of the glass melts.

    In this work 20NaO2-10RxOy-70SiO2 glasses were used. RxOy is CaO, BaO, MgO, ZnO, SrO or a mix of CaO with BaO, MgO, ZnO, SrO, B2O3, Al2O3 or TiO2. Nitrate and 0,2 mol% Sb2O3 were used as refining agent. In the glasses with a combination of CaO and B2O3 the number of bubbles was lower compared to the glass with only CaO. In all other glasses the amount of bubbles was higher. A maximum number of bubbles were found in the glass containing a combination of CaO and SrO. The oxygen activity was measured at 1400C in glass melts with SrO, CaO+SrO, CaO+BaO and with CaO+B2O3.

  • 293.
    Gunnarsson, Erik
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Camitz, Mattias
    Visualisering och informationshantering i Google SketchUp2009Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    It has always been a goal to obtain good communication between partners in business within a building project. One way to obtain this is to use building information modeling (BIM). The purpose of our thesis is to find the frontlines of BIM in drawing software in common and particularly in SketchUp and also to draw conclusions regarding IFC.

    What is BIM, Sketchup and IFC?

    In short terms, BIM, Building Information Model, is a model that contains and handles all information associated to a building project. SketchUp is a software program and acts mainly as a support program to architects but also as a software tool for designers. IFC is an international standard file format. The format enables an open and efficient information flow in building projects.

    We created a model of one of the eight-storey houses at the Limnologen block in Växjö in SketchUp partly to test its IFC and BIM compatibilities but also to get a common insight to what the software could accomplish. The conclusions of the test gave us a deeper understanding to what options the program had, and that BIM and IFC functions are currently limited in SketchUp.

     

  • 294.
    Gunnarsson, Marcus
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Paulsson, Linus
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Continuous Improvements towards lean manufacturing2005Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The competition within the manufacturing branch becomes harder and harder, and demands such as higher quality and lower production costs has to be attained to stay on the market. A company who stops becoming better, will soon end up just not being good enough, Bergman & Klefsjö (2001). This is a statement commonly known and therefore Continuous Improvement (CI) is one of the cornerstones within production philosophies such as Lean Manufacturing and Toyota Production System. CI is a very important activity but will not be something that a company acquires over a night, and there will be problems both with the implementation and the long-term sustainability of the programme. There exists a large number of articles and books of how to overcome these difficulties and draw up a successful Continuous Improvement Programme (CIP), but there is a lack of good models. In this thesis the factors that are important for CI work are emphasized and a model is suggested. The model includes the following constituents; Management commitment, education, design, communication and feedback, measurements and benchmarking, recognition, clear goals, and regeneration. A survey based on the model was constructed and performed at seven companies within the Swedwood group (one of the world’s biggest furniture manufacturers) and two Swedish companies; ITT Flygt AB and Autoliv Sverige AB. The intention was to map the case companies’ present work within the constituents of the model and to find good practice. The survey was divided into three parts; first interviews with the management and then questionnaires to both management and operators. The survey verified many parts of the suggested model, and can be used with the intention to highlight which area of the organisation that needs to be improved in order to run a successful CIP. During the mapping of the case companies some good practice was found: 1. Traditional education technique can be mixed with games to increase motivation and understanding. 2. In order to follow the progress with a CIP, CI has to be measured and benchmarked. 3. Recognition is one of the most important motivation factors for operators. Therefore it is important to define and structure the recognition system and make a real effort to show and inform employees about the recognition given, so that this will become common knowledge. 4. It is of great importance that there is a rapid feedback within a CIP. 5. Most of the case companies have implemented an individual CIP, teamwork is advocated as a group of individuals can achieve more together than working separately.

  • 295.
    Gupta, Bharat
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    HOW TO IMPROVE NONCONFORMITY ROUTINES2006Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report is all about quality improvement work with focusing on nonconformities routines. The purpose is to improve the process of nonconformity routines and to identify the most important issues and causes behind nonconformity routines in order to have good quality of the products and satisfied customer to achieve continuous improvement. This project is conducted at a case study at the case company GMV Sweden AB producing lifts and their components. The problem in the case company is how the case company is handling nonconformity routines which consist currently of two streams one for problems in production which leads to internal nonconformities and another is handling customer complaints. The author visits the case company to collect essential information for this work and performs face-to-face user interviews, Q&A via email. The knowledge gained on different quality tools in author's education on Terotechnology department forms the basis of this research. The author plans to solve the problem by analyzing, mapping the existing processes and using different quality tools. The author analysis is based on theoretical and empirical facts, also different quality tools like process mapping, cause effect diagram, flowchart has been used to identify the problem and relevant suggestions have been proposed to improve their current situation. In the results and conclusions the author has explain the various improvement techniques and suggestions to handle internal nonconformities and customer complaints. The author believes by implementing the suggested improved model company can address their quality issues, which will improve the productivity to a greater extent and enable them to achieve their goal of continuous improvement.

  • 296.
    Gustafsson, Barbro
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design. Kemiavdelningen.
    Dealing with the democratic aspects in science education2008Conference paper (Refereed)
    Abstract [en]

    Dealing with the Democratic Aspects in Science Education

    Barbro Gustafsson, PhD-student and lecturer, School of Education, Växjö University, S-351 95 Växjö, Sweden.

    Background, Aims and Framework

    Teachers’ main tasks can be summarized in the form of an overarching, two-part assignment: to present subject matter and to foster independent, democratic members of society. This is sometimes called “the double assignment”, comprising a subject matter (or knowledge) assignment and a democracy assignment. I see the relationship between scientific subject matter and democracy in dialectical terms. On the surface, the concepts might appear to contradict one another. However, similar to other conceptual pairs such as theory–practice, body–soul, individual–society and humankind–nature, they are united and mutually dependent by virtue of an inner relationship (Israel, 1980). I refer to Hegel’s dialectical view that involves striving to understand the commonalities among apparent opposites; my goal is to highlight the integrating whole by emphasizing the subject matter–democracy relationship in science education.

    You could say that the subject matter task is in itself a democracy task, seeing that pupils who understand the subject matter of their education are better equipped to manage in their daily lives and to take an active part in democratic decisions. The democratic assignment is, however, about much more – it is about using democratic forms and communicative interaction with others to foster attitudes that are in line with the fundamental values of society.

    In my work as a teacher educator, for three years I had the opportunity to meet all of Växjö University’s student teachers during their first semester of study. During a course in Sustainable Development, the students were reading the book Naturvetenskap som allmänbildning [The Natural Sciences as General Education] (Sjøberg, 2000). One of the points that are highlighted in the author’s arguments for learning science is that knowledge in science is needed for democratic reasons.

    The student teachers were then asked to write down their reflections on their own view of the need for scientific literacy. The texts reflected their experiences of what science education has been like, but also their hopes about what it could be like in the future.

    An analysis of the texts shows that for many of the student teachers, science education was boring and outdated. For this reason they do not care for further studies in the natural sciences. For these students, it was not enough to be able to explain how things work in a scientifically or technically correct manner – which they believe that educational practice has focused on so far. They did not become engaged. Many of them feel that they have not been trained to argue, discuss, or take a stance because most topics, particularly within physics and chemistry, are already “proven and established.” The argument that scientific literacy and science education contribute to the democratic development of individuals and society seems unfamiliar to the students. Many of them describe the opposite situation, that is, that more than any other subject, science education is characterized by authoritarian content and methods. Nor have they really understood the legitimacy of the natural sciences in the schools. The teacher students wish for a type of science education in which communication, ethical and moral reasoning, and existential and emotional issues are included. These experiences of student teachers became the starting point for my work.

    The purpose of my presentation is to highlight the relationship between teachers’ subject-matter and democracy assignments, and to show how dialogue-oriented educational efforts may be used to integrate both assignments in science education.

    I deal with the following questions:

    • How can the subject-matter and democracy assignments be united in science education?

    • How can dialogue in education help prepare pre-service teachers to better manage the dual responsibility to teach subject matter and foster democratic citizens?

    The idea that dialogue and communication are important for learning subject matter and for democratic development has compelled me to combine democracy theory in the form of the deliberative dialogue model with theories about learning, communication and socialization. My interpretation of the term “socialization” is not limited to order, subordination and adaptation in relation to a given system (for example, society or the schools), in which normative frameworks specify what is correct, right, and morally acceptable behavior within the system. In education, socialization must involve the ability and willingness to show consideration for others outside one’s own given framework, according to the principles of “Enlightened understanding” (Dahl, 1989).

    Conclusions and Implications

    Based on research on the importance of dialogue for learning subject matter and for democratic development, I propose dialogue-based efforts to help bridge the gap between subject matter and democracy in science education. By democracy, I mainly refer to deliberative processes in which the participants – in mutual communication – test the tenability of each other’s arguments seen from a universal perspective (Benhabib, 2002; Englund, 2006; Gutmann & Thompson, 1996). The idea of the importance of democratic dialogue for both learning and democracy implies that such dialogue can be seen as an opportunity to integrate the subject-matter and democracy assignments in teaching practice.

    The philosophical aspect of my argument rests on the idea that dialogue can be seen in part as a democratic goal in itself, and in part as a method for achieving learning objectives within a given subject. Because deliberative discussions require a certain knowledge of subject matter, I believe that the combination offers possibilities for both scientific and democratic development.

    I also argue that student teachers should practice this type of integrative effort within the framework of the subject didactics component of their teacher training. For this reason I highlight the educational possibilities inherent in deliberative discussions about authentic or fictitious “socio-scientific issues” (Kolstø, 2001; Ratcliffe & Grace, 2003; Sadler & Donnelly, 2006) in teacher training. “Socio-scientific issues” are questions in which the problems involve scientific facts as well as sociological (normative) and subjective value aspects.

    While I do not subscribe to the idea of a universal method, I do believe that teaching should be varied in order to offer different pathways to learning. One possible pathway to explore is deliberative discussions, in which pupils and even pre-service science teachers in training are given opportunities to improve their argumentation skills, their ability to take a stance, and to develop democratic skills via discussions of complex issues related to the natural sciences. Deliberative discussions can provide the opportunity to change perspectives, with an eye toward pedagogic discourse in science education, and with the goal to unite the dual assignment – knowledge of subject matter and democratic development. During their didactics training, student teachers can, for example, plan, carry out and evaluate discussion-based efforts.

    However, the idea of deliberative discussions must also be critically evaluated. It is a relatively controlled procedure, which may seem rather dubious when seen from the perspective of democratic freedom. For example, the participants must agree upon the rules of order for the discussions as well as agree to follow them. To this end, they must treat each participant’s argument with respect, tolerance and sensitivity. Those who engage in a deliberative discussion must also be able to present a common ground, a form of consensus, even if it can be a question of a temporary agreement. Critics of this consensus-oriented focus point out that the explicit aim to reach an agreement in a discussion can be a hinder to critical argumentation, and thus impede the discussion. Another viewpoint is that the unavoidable power structures between different pupils – and between teachers and pupils – render genuinely deliberative discussions impossible. Additionally, the relatively out-of-the-way role of the teacher in deliberative discussions has also been questioned. In this case, I agree with Englund’s (2006) view that teachers certainly must not abdicate from their actual (subject-matter) and formal authority. When using deliberative discussions in teaching, the traditional tasks of planning and leading classroom work and answering pupils’ questions still remain. However, through their choice of material and methods, teachers – together with their pupils – can create the conditions for a “discursive situation” in which the participants agree about the guidelines of mutual respect and a willingness to understand (ibid. p. 513).

    The increased use of deliberative discussions in science education would be somewhat time consuming. However, could reducing the time devoted to other elements be counterbalanced by qualitative improvements through the discussions? It is fully conceivable that discussing complex and topical “socio-scientific issues” could increase the interest in science. Discussion-based teaching can therefore be an example of one of the various changes that Osborne and Dillon (Osborne & Dillon, 2008) see as necessary in order to reverse the trend of declining recruitments to natural science education.

    The potential of deliberative discussions must be evaluated against the background of the challenges I have described here. The evaluation should offer the freedom to deviate from certain aspects of the ideal behind deliberative discussions, in order to evaluate their potential in classroom situations.

    The daunting and delicate task of evaluating whether or not deliberative discussions really do contribute to both democratic development and in-depth knowledge in science remains to be examined empirically. I will present some preliminary results from an empirical study including three classes in upper secondary school, studying Nature and Environment A [Naturkunskap A]. The students were discussing two “socio-scientific issues” concerning the greenhouse effect, using the guidelines from the teaching scenario presented by Gustafsson (2007, p. 115-116). In this study, the aim is to evaluate what is said and to interpret what is left unsaid, as well as how the discussions contribute to pupils’ scientific literacy and their democratic development. How scientific knowledge is used and how democracy aspects are expressed in the discussions are areas of particular interest.

    Bibliography

    Benhabib, S. (2002). The claims of culture : equality and diversity in the global era. Princeton, N.J. ; Oxford: Princeton University Press.

    Dahl, R. A. (1989). Democracy and its critics. New Haven: Yale Univ. Press.

    Englund, T. (2006). Deliberative communication: a pragmatist proposal. Journal of Curriculum Studies, 38(5), 503-520.

    Gustafsson, B. (2007). Naturvetenskaplig undervisning och det dubbla uppdraget. NorDiNa, 3(2), 107-120.

    Gutmann, A., & Thompson, D. F. (1996). Democracy and disagreement : why moral conflict cannot be avoided in politics, and what should be done about it. Cambridge, Mass.: Belknap Press.

    Israel, J. (1980). Språkets dialektik och dialektikens språk. Stockholm: Esselte studium.

    Kolstø, S. D. (2001). Science Education for Citizenship. Thoughtful Decision-Making About Science-Related Social Issues., University of Oslo, Oslo.

    Osborne, J., & Dillon, J. (2008). Science Education in Europe. A report to the Nuffield foundation. from http://www.nuffieldfoundation.org/fileLibrary/pdf/Sci_Ed_in_Europe_Report_Final.pdf

    Ratcliffe, M., & Grace, M. (2003). Science education for citizenship : teaching socio-scientific issues. Maidenhead: Open University Press.

    Sadler, T. D., & Donnelly, L. A. (2006). Socioscientific Argumentation: The effects of content knowledge and morality. International Journal of Science Education, 28(12), 1463-1489.

    Sjøberg, S. (2000). Naturvetenskap som allmänbildning : en kritisk ämnesdidaktik. Lund: Studentlitteratur.

  • 297.
    Gustafsson, Barbro
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design. Kemiavdelningen.
    Democracy in Science Education2006In: Rikskonferensen i ämnesdidaktik, 2006Conference paper (Other academic)
  • 298.
    Gustafsson, Barbro
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design. Kemiavdelningen.
    Democracy in Science Education.2007In: Integrativ didaktik i olika ämnesperspektiv / [ed] Fritzell, C. & L. Fritzén, Växjö university press , 2007, p. 51-56Chapter in book (Other academic)
  • 299.
    Gustafsson, Barbro
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design. Kemiavdelningen.
    Hur förena naturvetenskap och demokrati?2008In: http://www.umn.su.se/content/1/c6/03/24/34/abstractsamling.pdf: Presentation vid rikskonferensen i ämnesdidaktik ”Kunskapssyn, kanon, bedömning”, 22−23 maj i Stockholm., 2008Conference paper (Refereed)
    Abstract [sv]

    Mitt bidrag handlar om att integrera naturvetenskap och demokrati i undervisningen. Studenters upplevda brister på demokratiaspekter och motsättningar mellan ämne och demokrati utgör utgångspunkt för mitt arbete, som belyser förhållandet mellan lärarens dubbla uppgift; ämnesuppdraget och demokratiuppdraget.

    Med stöd i forskningen kring samtalets betydelse för såväl ämnesmässigt lärande som demokratisk utveckling föreslår jag samtalsinriktade ansatser för att överbrygga klyftan mellan ämne och demokrati i naturvetenskaplig undervisning. Det filosofiskt inriktade resonemanget handlar om att samtalet kan ses dels som ett demokratiskt mål i sig, dels som en metod för att nå kunskapsmässiga mål inom givet ämnesområde. I och med att deliberativa samtal ställer kunskapsmässiga anspråk menar jag att sådana kan erbjuda möjligheter till såväl naturvetenskaplig som demokratisk utveckling. Med demokrati avser jag främst deliberativa processer där deltagarna i en ömsesidig kommunikation prövar hur långt egna och andras argument håller i ett större perspektiv, där empatisk förmåga och gemensam strävan efter ett gott liv utgör viktiga dimensioner. Tanken om det deliberativa samtalets såväl demokratiska som kunskapsutvecklande betydelse gör att sådana samtal kan ses som en möjlighet att i undervisningen integrera ämnesuppdraget med demokratiuppdraget.

    Idén om det deliberativa samtalet bör granskas kritiskt. Det är en förhållandevis styrd procedur, vilket kan uppfattas som tveksamt utifrån demokratiska frihetsanspråk. Deltagarna måste till exempel komma överens om vilka samtalsregler som ska gälla och de ska även kunna vara överens om att följa dem. Hit hör att de måste visa respekt, tolerans och lyhördhet för varandra och för andras argument. De som deltar i ett deliberativt samtal ska avslutningsvis kunna presentera en gemensam hållning, även om det kan vara frågan om en temporär överenskommelse. Denna konsensusinriktade strävan har mött kritik, då man menar att en uttalad strävan efter att komma överens i ett samtal kan motverka en kritisk argumentation och därigenom hämma diskussionen. En annan synpunkt är att ofrånkomliga maktstrukturer mellan olika elever såväl som mellan lärare och elev omöjliggör äkta deliberativa samtal. Likaså har lärarens relativt undanskymda roll i deliberativa samtal ifrågasatts. Jag menar att det deliberativa samtalets potential måste granskas mot bakgrund av de utmaningar jag redogjort för här. Granskningen bör erbjuda viss frihet att göra avsteg från någon delaspekt av det deliberativa samtalets ideal för att i undervisningssituationen pröva idén om dess potential.

    Jag föreslår hållbar utveckling som ett tänkbart undervisningsområde för integrativa ansatser i form av samtal kring komplexa samhällsfrågor med naturvetenskapligt faktainnehåll. Sådana sociovetenskapliga frågeställningar innefattar förutom naturvetenskap även sociologiska (normativa) och subjektiva värdeaspekter. Jag skisserar även ett tänkt undervisningsscenario med deliberativa elevsamtal kring ett tema med sådant innehåll.

    Hypotesen att elever utvecklar såväl naturvetenskapliga kunskaper som demokratiska förmågor genom att samtala kring sociovetenskapliga frågor måste prövas empiriskt. Jag genomför under våren en sådan studie i en gymnasieskola inom ramen för Naturkunskap A.

    Jag spelar in elevsamtal kring växthuseffekten, för att senare analysera vad som sägs (och tolka vad som inte sägs) i sådana samtal. Av särskilt intresse är hur naturvetenskaplig kunskap används och hur demokratiaspekter kommer till uttryck i samtalet. Den grannlaga uppgiften blir att bedöma ifall diskussionerna bidragit med naturvetenskapliga kunskaper samt om och hur demokratiska förmågor har utvecklats. Här tror jag att konferensens deltagare kan bidra med värdefulla synpunkter som leder mig vidare i arbetet.

    Barbro Gustafsson

    Växjö universitet

  • 300.
    Gustafsson, Barbro
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design. Kemiavdelningen.
    Interdisciplinary Course in Sustainability for all Student Teachers in Växjö, Sweden2006In: Reflective Practice in Teacher Education, Peter Lang AG, Bern , 2006Chapter in book (Other academic)
3456789 251 - 300 of 776
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf