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  • 1.
    Andersson, Roy
    et al.
    University of Borås, School of Engineering.
    Månsson, Bo
    University of Borås, School of Engineering.
    Yar Hamidi, Daniel
    University of Borås, School of Business and IT.
    Resilience in the supply and demand chain a new management strategy2012Conference paper (Other academic)
    Abstract [en]

    The length and complexity of the supply chain tend to increase, rather than diminish, thereby making the supply chain riskier and less predictable and, hence, more vulnerable. At the same time, customers are becoming increasingly demanding. The challenge to businesses today is to create a resilient supply chain in order to manage and mitigate risk and vulnerability. The purpose of this paper is to describe the use methods and tolls from quality and logistics can improve supply chain resilience. There are five principles that characterise supply chain resilience: risk management culture, agility, design-and innovation-led organisations, collaboration and spreading and anchoring of the vision, goal, values and methods. Using a combined quality management philosophy, the speed of process could be increased, and the responsiveness and flexibility could be improved, which means quicker response to changes. It has also been indicated that a combined quality management philosophy improves the companies’ resilience, due to their increased agility and strengthened ability to handle variability and risk management. Quality management tools can be very effective in the companies’ efforts to control supply chain risk and to identify risk sources of variation, even outside the focal company.

  • 2.
    Dessne, Karin
    University of Borås, Faculty of Librarianship, Information, Education and IT.
    Vägen till samarbete: Innovationsplattform Norrby och Textile Fashion Center2016Report (Other academic)
    Abstract [sv]

    Samarbete mellan organisationer som kan främja forskning och utveckling sker ofta i regional kontext mellan akademi, näringsliv och myndigheter. Två sådana regionala samarbeten för Borås återfinns som fallstudier i denna rapport: Innovationsplattform Norrby och Textile Fashion Center.

    Många studier kring samarbete har sin hemvist främst inom management och ekonomi där fokus ligger på att identifiera framgångskoncept för att styra, kontrollera och hantera samarbete. Kunskap ses som något som bör överföras till nytta för den enskilde aktören och lärande ses som en konsekvens av att systematiskt överföra kunskap mellan organisationer. Dessa studier har även konstaterat att det i samarbete över organisationsgränser bland annat finns skillnader i kulturer och rutiner, bristande tillit och bristande respekt av varandras kompetens. Hur dessa faktorer påverkar de sociala relationerna har dock inte studerats i någon större utsträckning. Färre är således de studier som i stället med sociala utgångspunkter undersöker lärande mellan organisationer när det gäller själva dynamiken i relationerna – särskilt på den operativa nivån. Det behövs mer kvalitativt inriktad forskning för att förstå samarbete som äger rum i sådana relationer för att på så sätt också få insikt i hur samarbete mellan organisationer kan skapas, underbyggas och utvecklas.

    Denna rapport presenterar en kvalitativ studie som undersöker hur relationer i ett samarbete mellan organisationer kan se ut och på vilka sätt organisationer kan skapa förutsättningar för att bygga samarbete utifrån ett socialt lärandeperspektiv. Studien har genomförts inom ramen för Collaboration Arenas, CARENA, ett större forskningsprojekt finansierat av Vinnova. I CARENA arbetade sex lärosäten tillsammans för att utveckla modeller eller arenor för strukturerat och långsiktigt samarbete. Förutom Högskolan i Borås medverkade högskolorna i Trollhättan, Skövde, Jönköping, Halmstad och Malmö.

  • 3.
    Huč, Sabina
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Hozjan, Tomaž
    University of Ljubljana.
    Svensson, Staffan
    University of Borås, Faculty of Textiles, Engineering and Business.
    Rheological behavior of wood in stress relaxation under compression2018In: Wood Science and Technology, ISSN 0043-7719, E-ISSN 1432-5225Article in journal (Refereed)
    Abstract [en]

    Rheological behavior of wood under uniaxial compression along and perpendicular to the grain in constant environment was examined. Tests with constant deformation rate until failure and stress relaxation tests with constant deformation applied stepwise were carried out. The experimental results of stress relaxation showed nonlinear material behavior over time that got more prominent under high deformation levels. Considerable amount of stress relaxed during applying the deformation. Wood experienced greater stress relaxation along the grain than perpendicular to it. Three rheological models for orthotropic material were calibrated to the experimentally determined stress–time curves in longitudinal and transverse directions simultaneously. Small deformation levels assuming linear strains were accounted for in the models. Required elastic material parameters were determined from the tests with constant deformation rate. A model including the highest number of viscoelastic material parameters was the most successful in predicting stress relaxation of wood under stepwise deformation. Modeling indicated that wood behavior was very close to linear viscoelastic in relaxation under small deformation. The obtained material parameters made the model suitable for predicting rheological behavior of wood comprehensively, under sustained deformation or load in constant conditions

  • 4.
    Huč, Sabina
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Svensson, Staffan
    University of Borås, Faculty of Textiles, Engineering and Business.
    Coupled two-dimensional modeling of viscoelastic creep of wood2018In: Wood Science and Technology, ISSN 0043-7719, E-ISSN 1432-5225, Vol. 52, no 1, p. 29-43Article in journal (Refereed)
    Abstract [en]

    Three coupled two-dimensional viscoelastic creep models for orthotropic material are analyzed. The models of different complexity are mathematically formulated and implemented in a finite element software. Required viscoelastic material parameters are determined by calibration procedure, where numerical results are compared against experimentally obtained viscoelastic strains caused by tensile or shear loading. Finally, a comparison method is used to evaluate the accuracy of strain predictions of each particular model. The analysis shows that all the models are able to accurately predict viscoelastic creep simultaneously in two perpendicular directions for various periods of time and wood species. Calculated numerical values of the viscoelastic material parameters suitable for the three models and wood species, i.e., Douglas fir (Pseudotsuga menziesii), Norway spruce (Picea abies), Japanese cypress (Chamaecyparis obtusa), and European beech (Fagus sylvatica L.), under constant tensile loading are also given.

  • 5.
    Nagy, Agnes
    University of Borås, School of Engineering.
    Fiberförstärkt massivträ2013Report (Other academic)
    Abstract [sv]

    Syftet med projektet är att förbättra massivträprodukters mekaniska egenskaper både avseende styrka och töjbarhet genom att förstärka dem med textilmatta.

  • 6.
    Pecenko, R.
    et al.
    Univ. Ljubljana.
    Svensson, Staffan
    University of Borås, Faculty of Textiles, Engineering and Business.
    Hozjan, T.
    Univ. Ljubljana.
    Model evaluation of heat and mass transfer in wood exposed to fire2016In: Wood Science and Technology, ISSN 0043-7719, E-ISSN 1432-5225, Vol. 50, no 4, p. 727-737Article in journal (Refereed)
    Abstract [en]

    The paper presents sensitivity analysis of coupled heat and moisture transfer model for timber exposed to fire. The objective of the analysis is to discover the non-influential model parameters and the model simplification accordingly. To achieve this, the standardized regression coefficient (SRC) method is introduced to determine the impact of specific permeability of dry timber K, bound water diffusion coefficient , vapour diffusion coefficient and heat of sorption on the two model outcomes, charring depth and total moisture content . The SRC method revealed that the least influential parameter is specific permeability of dry timber K. Therefore the model was adequately simplified by a more simple description of the energy equation, while preserving the accuracy of the results. Thus, the efficiency of the present coupled heat and moisture transfer model was increased.

  • 7.
    Pecenko, R.
    et al.
    University of Ljubljana.
    Svensson, Staffan
    Hozjan, T.
    University of Ljubljana.
    Modelling heat and moisture transfer in timber exposed to fire2015In: International Journal of Heat and Mass Transfer, ISSN 0017-9310, E-ISSN 1879-2189, Vol. 87, p. 598-605Article in journal (Refereed)
  • 8.
    Rorig-Dalgaard, I.
    et al.
    DTU.
    Svensson, Staffan
    University of Borås, Faculty of Textiles, Engineering and Business.
    High accuracy calibration of a dynamic vapor sorption instrument and determination of the equilibrium humidities using single salts2016In: Review of Scientific Instruments, ISSN 0034-6748, E-ISSN 1089-7623, Vol. 87, no 5Article in journal (Refereed)
    Abstract [en]

    We present a procedure for accurately calibrating a dynamic vapor sorption (DVS) instrument using single salts. The procedure accounts for and tailors distinct calibration tests according to the fundamental properties of each salt. Especially relevant properties influencing the calibration are the heat of solution, heat of condensation, and the kinetics connected to the salt phase transition, as these influence the microclimate surrounding the salts during calibration. All these issues were dealt with to obtain precise calibration results. The DVS instrument comprises two control modes to generate and measure the relative humidity (RH). Both control modes were separately examined and combined to overcome the shortcomings of each of the two control modes and thereby obtain the most accurate results. Repeated calibration testing with the single salts (LiCl, MgCl2, Mg(NO3)2, NaCl, and KNO3) enables five discrete sorption isotherm measurements within the range of 11%-93%RH. The equilibrium RH of the solution for LiCl, MgCl2, Mg(NO3)2, NaCl, and KNO3 was determined with a standard deviation of 0.06%-0.15% (0.45% for KNO3) RH. By comparing the measured calibration values with the well-known equilibrium RH of each salt solution, the presented method's results are both accurate with significant agreement and precise with small variation.

  • 9.
    Sadagopan, Madumita
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Malaga, Katarina
    University of Borås, Faculty of Textiles, Engineering and Business.
    Nagy, Agnes
    University of Borås, Faculty of Textiles, Engineering and Business.
    A modified pycnometer method to determine the water absorption of combined crushed concrete aggregate fractions2019In: International Conference on Sustainable Materials, Systems and Structures (SMSS2019): Novel Methods for Characterization of Materials and Structures / [ed] Gabrijel I, Grosse C, Skazlić M, 2019, p. 286-292Conference paper (Refereed)
    Abstract [en]

    Crushed Concrete Aggregates (CCA) as fine and coarse aggregates in new concrete helps achieve closed-loop recycling. Assessment of workability, mechanical properties and durability of concrete demands knowledge of the water absorbed by the CCA. The EN 1097-6standard method is difficult to execute due to the presence of entrapped air and CCAsedimentation while performing water absorption experiment for fine CCA. Additionally, the assessment of Saturated Surface Dry (SSD) state seems operator specific and nonreproducible;moreover, giving water absorption measurement only at 24 hours. However, findings from this paper show measurements at 15 minutes is influential for concrete workability. The modified pycnometer method analyses the water absorption of a combined fraction consisting of coarse and fine CCA as proportioned in a given concrete recipe. Furthermore, sedimentation and entrapped air are prevented by pre-soaking the CCA in a solution of distilled water and poly-carboxylate based superplasticizer before commencing the experiment. Ultimately, the combined fraction is drained to SSD condition by vacuum filtration, which is easy to handle by professional operators. In this way, the water absorption development is measured from starting point to 24 hours for the combined fraction to determine the appropriate water amount to saturate CCA during concrete mixing.

  • 10.
    Sadagopan, Madumita
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Nagy, Agnes
    Malaga, Katarina
    University of Borås, Faculty of Textiles, Engineering and Business.
    RE:Concrete- Study on Recycling of Concrete in Sweden2017In: Nordic Concrete Research, ISSN 0800-6377, no 56, p. 83-99Article in journal (Refereed)
    Abstract [en]

    Sweden’s concrete waste is recycled for use in low-utility purposes such as in the construction of sub-bases in roads but hardly as aggregates in new concrete. To analyse the potential for high-utility recycling, a literature study was conducted on the regulatory instruments, building standards, production and properties of recycled concrete aggregates and the recycled aggregate concrete for Sweden and European countries. Results urge statistics to quantify recycled concrete; regulations like source sorting of waste and selective demolition could potentially optimize recycled aggregate production. Also, the compressive strength of recycled concrete aggregate’s parent concrete influences the properties of the new concrete.

  • 11.
    Svensson, Pauline
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Lostin, Fanny
    University of Borås, Faculty of Textiles, Engineering and Business.
    Arbetsmiljöattityder hos underentreprenörer: agerande och attityder på arbetsplatser2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In collaboration with NCC, a study has been made. The study´s intention is to investigate the reason why the subcontractors don´t always follow NCC´s public order and safety rules. The study also explores how the attitude to the rules of the subcontractors changes, depending on how the rules are followed by the employees on each project. It will also cover how subcontractors act when employees put themselves or others at risk at workplaces.A comprehensive literature study has been made, where relevant material has been used to expand the knowledge and to function as the foundation for a quantitative method. Information was collected through email contact with the subcontractors contact persons and in the two surveys where the supervisors of NCC and subcontractors participated.Suggestions for measures have been discussed based on the result and comparison with the literature. These suggestions may help NCC to continue to create a better working environment and improve the work against their vison.In the study, it is clear that there are many factors that influence the attitude towards the public order and safety rules of the subcontractors. Furthermore the cooperation between all the parties that are involved at the workplaces needs to improve, in order to achieve a safe and secure working environment.

1 - 11 of 11
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