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  • 2001.
    Bergquist, Per
    SP – Sveriges Provnings- och Forskningsinstitut.
    Provning av solvärmda tappvarmvattensystem: en målstudie1992Report (Refereed)
  • 2002.
    Bergquist, Per
    et al.
    SP – Sveriges Provnings- och Forskningsinstitut.
    Carlsson, Bo
    Minnesanteckningar från möte ISO TC 180, 19931994Report (Refereed)
  • 2003.
    Bergquist, Per
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Energiteknik (ET).
    Kovacs, Peter
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Energiteknik (ET).
    Carlsson, Bo
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Energiteknik (ET).
    Liedquist, Leif
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Energiteknik (ET).
    Europeisk och internationell standardisering inom solvärmeteknikområdet - en sammanställning för 19971998Report (Refereed)
  • 2004. Bergstedt, L
    et al.
    Persson, K
    RISE, Swedish ICT, Acreo.
    Printed Glass for Anodic Bonding - A Packaging Concept for MEMS System On a Chip2002In: Advancing Microelectronics, Vol. 29, no 1Article in journal (Refereed)
  • 2005.
    Bergstedt, S
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Svenska livmedelsinstitutet.
    Erlöv, L
    Lingnert, H
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Institutet för livsmedel och bioteknik.
    Olsson, P
    Forskning och utveckling inom området livsmedelsförpackningar i USA och Japan 1988. En reserapport.1989Report (Refereed)
  • 2006.
    Bergsten, Lasse
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Elektronik, EMC.
    EMC requirements for type approval of marine electronics. Nordtest project 1157-94.1994Report (Refereed)
  • 2007.
    Bergsten, Lasse
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Elektronik, EMC.
    EMC-requirements on vehicle electronics. Nordtest project 828-89.1991Report (Refereed)
  • 2008.
    Bergsten, Lasse
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Elektronik.
    Guldbrandsen, Per
    Larsen, Are
    EMC requirements for marine electronics. Nordtest project 1157-94.1996Report (Refereed)
  • 2009.
    Bergsten, Tobias
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Disordered Fermi liquid in epitaxial graphene from quantum transport measurements2011In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 107, no 16, p. 166602-Article in journal (Refereed)
  • 2010.
    Bergsten, Tobias
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    The EMRP project GraphOhm- Towards quantum resistance metrology based on graphene2014In: CPEM 2014, 2014, , p. 548 - 549Conference paper (Refereed)
  • 2011.
    Bergsten, Tobias
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Eklund, Gunnar
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    A quantum standard for sampled electrical measurements-Main goals and first results of the EMRP project Q-WAVE2014In: 29th Conference on Precision Electromagnetic Measurements, CPEM 2014, 2014, , p. 522-523Conference paper (Refereed)
  • 2012.
    Bergsten, Tobias
    et al.
    RISE - Research Institutes of Sweden, Safety and Transport, Measurement Science and Technology.
    Eklund, Gunnar
    RISE - Research Institutes of Sweden, Safety and Transport, Measurement Science and Technology.
    Comparison between GaAs and graphene QHR standards for resistance realisation at SP2016Conference paper (Refereed)
    Abstract [en]

    We report the first precision QHR measurements at SP using a graphene chip. We compare the results of a resistance calibration using GaAs based chips with the results using a graphene chip. The results agree within a few parts in 109 for calibrations of 100 Ω and 10 kΩ resistors. Consistency checks indicate that the uncertainty is lower with the graphene chip, and the noise level is slightly lower. The measurements with the graphene chip were performed exclusively at 4.2 K, which simplifies the calibration procedure considerably compared with GaAs chips.

  • 2013.
    Bergsten, Tobias
    et al.
    RISE - Research Institutes of Sweden, Safety and Transport, Measurement Science and Technology.
    Eklund, Gunnar
    RISE - Research Institutes of Sweden, Safety and Transport, Measurement Science and Technology.
    He, Hans
    Chalmers University of Techology, Sweden.
    Comparing GaAs and graphene QHR standards for resistance realisation at SP2016Conference paper (Other academic)
  • 2014.
    Bergsten, Tobias
    et al.
    RISE - Research Institutes of Sweden, Safety and Transport, Measurement Science and Technology.
    Rydler, Karl-Erik
    RISE - Research Institutes of Sweden, Safety and Transport, Measurement Science and Technology.
    Realisation of Absolute Phase and Ac Resistance of Current Shunts by Ratio Measurements2018In: CPEM 2018 - Conference on Precision Electromagnetic Measurements, 2018Conference paper (Refereed)
    Abstract [en]

    This article presents a method for realising absolute phase and ac resistance for current shunts using only impedance ratio measurements. The method is based on three geometrically identical current shunts with different resistances, but with the same inductance, capacitance and ac resistance (change of resistance at ac compared to dc), We demonstrate how the inductance, capacitance and ac resistance can be calculated from the complex impedance ratio measurements, thereby realising absolute current shunt impedance. This method simplifies the procedure of current shunt calibration, since the same impedance ratio setup which is used to compare a shunt to a reference shunt, is used to realise the impedance of the starting reference shunt.

  • 2015.
    Bergsten, Tobias
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Rydler, Karl-Erik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Gunnarsson, Ove
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Eklund, Gunnar
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Tarasso, Valter
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    A precision current source using Δ-Σ modulation.2011In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 60, no 7, p. 2341-2346Article in journal (Refereed)
  • 2016.
    Bergsten, Tobias
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Tarasso, Valter
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Eklund, Gunnar
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Josephson waveform generation using multilevel Δ-Σ Modulation2012In: Conference on Precision Electromagnetic Measurements, CPEM 2012, 2012, , p. 172-173Conference paper (Refereed)
  • 2017.
    Bergsten, Tobias
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Tarasso, Valter
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Rydler, Karl-Erik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Elektricitet.
    Determining voltage dependence of the phase response in voltage dividers2012In: Conference on Precision Electromagnetic Measurements, CPEM 2012, 2012, , p. 282-283Conference paper (Refereed)
  • 2018. Bergstrand, A.
    et al.
    Svanberg, C.
    Langton, Maud
    SIK – Institutet för livsmedel och bioteknik.
    Nyden, M.
    Aggregation behavior and size of lipopolysaccharide from Escherichia coli O55:B52006In: Colloids and Surfaces B: Biointerfaces, ISSN 0927-7765, E-ISSN 1873-4367, Vol. 53, no 1, p. 42261-Article in journal (Refereed)
    Abstract [en]

    Dynamic light scattering, steady-state fluorescence, NMR diffusometry and cryo-TEM have been used to gain more insight into the aggregation behaviour of LPS from Escherichia coli O55:B5. Knowledge of this behaviour of the amphiphilic LPS molecule is in many cases of importance for the design of experiments and interpretation of results when using LPS in solution. The aim of this work was to study the aggregation and determine the aggregate size of E. coli O55:B5. The mean hydrodynamic radius of the LPS aggregates was determined by NMR diffusometry and dynamic light scattering to 14 and 26 nm, respectively. The cryo-TEM technique revealed predominately spherical aggregates of 9-19 nm. We wish to report 10 ?g/ml as the aggregation start for LPS E. coli O55:B5 in PBS buffer, pH 7.2. We suggest that the aggregation is a continuous process that starts at 10 ?g/ml and proceeds up to 300 ?g/ml. © 2006.

  • 2019.
    Bergstrand, Anna
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    Databas för material inom Rolling Stock2015In: Brandposten, no 52, p. 17-Article in journal (Other (popular science, discussion, etc.))
  • 2020.
    Bergstrand, Anna
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Branddynamik.
    Storesund, Karolina
    Brandprovning och certifiering för material och produkter som används inom sjöfarts- och offshoreindustrin2015In: Brandposten, no 52, p. 7-Article in journal (Other academic)
  • 2021. Bergstrand, F.
    et al.
    Landgren, Jonas
    RISE, Swedish ICT, Viktoria.
    Using live video for information sharing in emergency response work2009In: International Journal of Emergency Management, ISSN 1471-4825, E-ISSN 1741-5071, Vol. 6, no 3-4, p. 295-301Article in journal (Refereed)
    Abstract [en]

    This paper presents findings from a design-oriented study focusing on emergency response work. Traditionally, Information Technology (IT) for emergency response work has included en route navigation advice, resource management, hazard material databases, property information repositories and situation reporting using sketching functionality. Now, a new class of IT has become available, namely mobile live video capabilities. This paper presents initial findings from a study on how mobile live video capabilities can improve information sharing and situation awareness in emergency response work.

  • 2022.
    Bergstrand, Karl-Johan
    et al.
    SLU Swedish University of Agricultural Sciences, Sweden.
    Löfkvist, Klara
    RISE - Research Institutes of Sweden, Bioscience and Materials, Agrifood and Bioscience.
    Organisk gödsling i krukodlade kulturer2017Report (Other academic)
    Abstract [sv]

    Det finns en ökande efterfrågan på ekologiska produkter. Producenter av ekologiskt producerade krukodlade produkter såsom kryddväxter, prydnadsväxter och grönsakplantor har stora odlingsutmaningar för att uppnå god kvalitet. Den stora utmaningen ligger i näringstillförseln och tidigare erfarenheter har varit blandade, ibland har produktkvalitén blivit dålig och man har misstänkt att obalanser i växtnäringstillförseln har varit orsak till detta. I ett pilotprojekt finansierat av Tillväxt Trädgård undersöktes kvävetillgängligheten från olika organiska gödselmedel i krukodlade kulturer.

  • 2023.
    Bergstrand, Kjell
    et al.
    SLU Swedish University of Agricultural Science, Sweden.
    Löfkvist, Klara
    RISE - Research Institutes of Sweden, Bioscience and Materials, Agrifood and Bioscience.
    Asp, Håkan
    SLU Swedish University of Agricultural Science, Sweden.
    Dynamics of nitrogen availability in pot grown crops with organic fertilization2018In: Biological Agriculture & Horticulture, ISSN 0144-8765, E-ISSN 2165-0616Article in journal (Refereed)
    Abstract [en]

    Pot grown herbs are often cultivated as certified organic products, and there is an increasing demand for organically certified ornamental plants. Supplying the required nutrients using organic fertilizers is a challenge with respect to matching the mineralization and thus the availability of dissolved nutrients in the growing medium with plant demand. In experiments, sweet basil and Pelargonium × hortorum were cultivated using two different organic fertilizer strategies and controlled-release mineral nutrients as control treatment. The two organic strategies were, i) blood meal + Baralith® Enslow (a plant-based organic fertilizer), and ii) poultry manure. The availability of dissolved nitrogen was monitored during the crop cycle by under-pressure lysimeter sampling. Plant development parameters were measured along with chlorophyll fluorescence and chlorophyll concentration of leaves. For both organic treatments, nitrate-N availability was low at the beginning of the experiment, whereas ammonium-N was high. During the experiment, ammonium availability decreased at the same time as nitrate availability increased after a few weeks and then declined again by the end of the experiment. The blood meal + Enslow treatment caused poor germination and slow growth in basil. Plant height and fresh weight was also affected by this treatment for basil but not for Pelargonium. Chlorophyll concentration was affected by treatment, with also visually detectable paler leaves in the treatment with poultry manure. There were no differences in chlorophyll fluorescence (Fv/Fm) between treatments, indicating that plants were not stressed in any of the treatments.

  • 2024.
    Bergstrand, Sten
    RISE - Research Institutes of Sweden, Safety and Transport, Measurement Science and Technology.
    Activities of the IERS Working Group on Site Survey and Co-location2016In: IVS 2016 General Meeting Proceedings: "New Horizons with VGOS" / [ed] Dirk Behrend, Karen D. Baver, and Kyla L. Armstrong, Greenbelt, MD: National Aeronautics and Space Administration , 2016, p. 113-117Conference paper (Other academic)
    Abstract [en]

    t The objective of the International Earth Rotation and Reference Systems Service (IERS) Working Group on Site Survey and Co-location is to improve local measurements at space geodesy sites. We appointed dedicated Points of Contact (POC) with the four different services of IERS as well as the NASA Space Geodesy Project in order to improve the efficiency of internal communication within the working group. Following the REFAG2014 conference, the POCs agreed on a common and general terminology on local ties that clarifies the communication regarding site surveying and co-location issues between and within the IERS services. We give brief introductions to the different observation techniques and mention some contemporary issues related to site surveying and co-location.

  • 2025.
    Bergstrand, Sten
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Evaluation of GNSS Monument Stability2010In: IAG Symposium on Reference Frames for Applications in Geosciences, REFAG 2010, 2010, , p. 45-50Conference paper (Refereed)
  • 2026.
    Bergstrand, Sten
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Intercomparison of lateral scales of scanning electron microscopes and atomic force microscopes in research institutes in Northern Europe2014In: Measurement science and technology, ISSN 0957-0233, E-ISSN 1361-6501, Vol. 25, no 4, p. 44013-Article in journal (Refereed)
  • 2027.
    Bergstrand, Sten
    et al.
    RISE - Research Institutes of Sweden, Safety and Transport, Measurement Science and Technology.
    Herbertsson, Magnus
    RISE - Research Institutes of Sweden, Safety and Transport, Measurement Science and Technology.
    Rieck, Carsten
    RISE - Research Institutes of Sweden, Safety and Transport, Measurement Science and Technology.
    Spetz, Jörgen
    RISE - Research Institutes of Sweden, Safety and Transport, Measurement Science and Technology.
    Svantesson, Claes-Göran
    RISE - Research Institutes of Sweden, Safety and Transport, Measurement Science and Technology.
    Haas, Rüdiger
    Chalmers University of Technology, Sweden.
    A gravitational telescope deformation model for geodetic VLBI2018In: Journal of Geodesy, ISSN 0949-7714, E-ISSN 1432-1394Article in journal (Refereed)
    Abstract [en]

    We have measured the geometric deformations of the Onsala 20 m VLBI telescope utilizing a combination of laser scanner, laser tracker, and electronic distance meters. The data put geometric constraints on the electromagnetic raypath variations inside the telescope. The results show that the propagated distance of the electromagnetic signal inside the telescope differs from the telescope’s focal length variation, and that the deformations alias as a vertical or tropospheric component. We find that for geodetic purposes, structural deformations of the telescope are more important than optic properties, and that for geodetic modelling the variations in raypath centroid rather than focal length should be used. All variations that have been identified as significant in previous studies can be quantified. We derived coefficients to model the gravitational deformation effect on the path length and provide uncertainty intervals for this model. The path length variation due to gravitational deformation of the Onsala 20 m telescope is in the range of 7–11 mm, comparing elevation 0$$^{\circ }$$∘and 90$$^{\circ }$$∘, and can be modelled with an uncertainty of 0.3 mm.

  • 2028.
    Bergstrand, Sten
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Saracoglu, Erhan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Hållbar Samhällsbyggnad.
    Continuous monitoring of a long-span cable-stayed timber bridge2014In: Journal of Civil Structural Health Monitoring, ISSN 2190-5452, Vol. 5, no 2, p. 183-194Article in journal (Refereed)
  • 2029. Bergstrm, E.M.
    et al.
    Salmen, L.
    RISE, Innventia.
    Kochumalayil, J.
    Berglund, L.
    Plasticized xyloglucan for improved toughness: Thermal and mechanical behaviour2012In: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, no 4, p. 2532-2537Article in journal (Refereed)
  • 2030.
    Bergström, B
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, TräteknikCentrum , Trätek.
    Kryprumsgrundläggning i trähus1986Report (Other academic)
  • 2031.
    Bergström, Birgitta
    SIK – Institutet för livsmedel och bioteknik.
    Lång hållbarhet utan mögel - Slutrapport till Jordbruksverket, SJV2010Report (Other academic)
  • 2032.
    Bergström, G
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik.
    Rapid crack propagation, RCP, in the PE casing of district heating pipes1999In: Proceedings of the 7th International Symposium on District heating and Cooling, May 18-20, 1999 at Lund, Sweden. Session 2B, Nordic Energy Research Programme , 1999, , p. Paper 18Conference paper (Other academic)
  • 2033.
    Bergström, Gunnar
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik.
    Compressive creep of polystyrene cellular plastics1989Report (Refereed)
  • 2034.
    Bergström, Gunnar
    Göteborg (BMg).
    Fuktdiffusion i plaströrssystem2002Report (Refereed)
  • 2035.
    Bergström, Gunnar
    Göteborg (BMg).
    Isocyanaterexponering vid svetsning av fjärrvärmerör2002Report (Refereed)
  • 2036.
    Bergström, Gunnar
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik.
    Erlandsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik.
    Bestämning av härdningsgrad på armerad plast1990Report (Refereed)
  • 2037.
    Bergström, Gunnar
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Göteborg (BMg).
    Flansbjer, Mathias
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Karlsson, Linda
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Sällberg, Sven-Erik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Göteborg (BMg).
    Thörnblom, Kristian
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Göteborg (BMg).
    Acceptanskriterier för repor och intryck i plaströr2009Report (Other (popular science, discussion, etc.))
  • 2038.
    Bergström, Gunnar
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Göteborg (BMg).
    Flansbjer, Mathias
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Karlsson, Linda
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Sällberg, Sven-Erik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Göteborg (BMg).
    Thörnblom, Kristian
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Göteborg (BMg).
    Acceptanskriterier för repor och intryck i plaströr Accpetance criteria for scratches and indentations in plastic pipes2009Report (Refereed)
    Abstract [sv]

    Development of materials and laying techniques have arisen the question how scratches and indentations in plastics pipes affect the strength and technical lifetime of pipelines. Scratches may occur both in the manufacturing of the pipes, in connection with the installation and subsequent maintenance. The problems in assessing the failure risk from scratches and indentations are similar for pipes used in gas and water distribution and in district heating applications. Therefore, a broad effort to identify the risks in relation to current pipe materials is technically and economically justified. The project has aimed to evaluate the effect of scratches and indentations on the technical lifetime of plastics pipes and to present criteria for maximum allowable depth of scratches and indentations. The study on pressure pipes focused on the conditions for scratched polyethylene pipes to achieve a lifetime of 50 years. It is noted that a scratch damage can not be judged solely on the basis of its depth and sharpness. To assess the impact of the scratch on the serviceability of the pipe, consideration must also be taken to the material from which the pipe was made and the safety factor used in the design. Extensive pressure tests show that pipes made of modern materials can withstand surface scratches to a higher degree than pipes of older materials. For pipes made of modern bimodal PE80 and PE100 materials, scratches up to 10% depth may be accepted without reduction of rated pressure. However, for pipes of older material, a reduction in pressure may be required already at smaller scratches. The study also indicates that for the same relative scratch depth, a greater reduction in pressure is required with increasing pipe dimension. The study on the non pressure pipes shows that the studied polypropylene pipes resist both deep scratches combined with ovalization and large indentations without any cracks penetrating the pipe wall. However, the extent and development of crazing and surface cracking vary with scratch depth, deformation level and material. The test pipes were subjected to extreme conditions very rarely or never occurring in practice. This suggests that small scratches at moderate ovalization and realistic indentations in temperatures around room temperature do not affect the lifetime of the pipes. One objective of the project was to develop a method for the evaluation of the scratch resistance of a pipe. In the proposed test method the force needed to produce a specified scratch is measured. This force is used as a relative measure of the scratch resistance of a pipe material when compared to other materials. In order to assess to what extent a scratch affects the lifetime of the pipe, the depth of the scratch must be estimated with reasonable accuracy. Since the scratch in many cases is found on existing pipelines the method must be suited for field use. To achieve that a simple instrument for scratch depth measurements was made and evaluated.

  • 2039.
    Bergström, Gunnar
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Göteborg (BMg).
    Flansbjer, Mathias
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Karlsson, Linda
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Sällberg, Sven-Erik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Göteborg (BMg).
    Thörnblom, Kristian
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Göteborg (BMg).
    Accpetance criteria for scratches and indentations in plastic pipes2009Report (Refereed)
    Abstract [sv]

    Development of materials and laying techniques have arisen the question how scratches and indentations in plastics pipes affect the strength and technical lifetime of pipelines. Scratches may occur both in the manufacturing of the pipes, in connection with the installation and subsequent maintenance. The problems in assessing the failure risk from scratches and indentations are similar for pipes used in gas and water distribution and in district heating applications. Therefore, a broad effort to identify the risks in relation to current pipe materials is technically and economically justified. The project has aimed to evaluate the effect of scratches and indentations on the technical lifetime of plastics pipes and to present criteria for maximum allowable depth of scratches and indentations. The study on pressure pipes focused on the conditions for scratched polyethylene pipes to achieve a lifetime of 50 years. It is noted that a scratch damage can not be judged solely on the basis of its depth and sharpness. To assess the impact of the scratch on the serviceability of the pipe, consideration must also be taken to the material from which the pipe was made and the safety factor used in the design. Extensive pressure tests show that pipes made of modern materials can withstand surface scratches to a higher degree than pipes of older materials. For pipes made of modern bimodal PE80 and PE100 materials, scratches up to 10% depth may be accepted without reduction of rated pressure. However, for pipes of older material, a reduction in pressure may be required already at smaller scratches. The study also indicates that for the same relative scratch depth, a greater reduction in pressure is required with increasing pipe dimension. The study on the non pressure pipes shows that the studied polypropylene pipes resist both deep scratches combined with ovalization and large indentations without any cracks penetrating the pipe wall. However, the extent and development of crazing and surface cracking vary with scratch depth, deformation level and material. The test pipes were subjected to extreme conditions very rarely or never occurring in practice. This suggests that small scratches at moderate ovalization and realistic indentations in temperatures around room temperature do not affect the lifetime of the pipes. One objective of the project was to develop a method for the evaluation of the scratch resistance of a pipe. In the proposed test method the force needed to produce a specified scratch is measured. This force is used as a relative measure of the scratch resistance of a pipe material when compared to other materials. In order to assess to what extent a scratch affects the lifetime of the pipe, the depth of the scratch must be estimated with reasonable accuracy. Since the scratch in many cases is found on existing pipelines the method must be suited for field use. To achieve that a simple instrument for scratch depth measurements was made and evaluated.

  • 2040.
    Bergström, Gunnar
    et al.
    Göteborg (BMg).
    Forsaeus Nilsson, Stefan
    Göteborg (BMg).
    Direktförlagda böjar i fjärrvärmeledningar - Påkänningar och skadegränser2001Report (Refereed)
  • 2041.
    Bergström, Gunnar
    et al.
    Göteborg (BMg).
    Forsaeus Nilsson, Stefan
    Göteborg (BMg).
    Groundwater leakage in pipe joints due to temperature variations2002In: Euroheat & Power, ISSN 0949-166X, Vol. 31, no 1, p. 54-58Article in journal (Other academic)
  • 2042.
    Bergström, Gunnar
    et al.
    Göteborg (BMg).
    Forsaeus Nilsson, Stefan
    Göteborg (BMg).
    Sällberg, Sven-Erik
    Göteborg (BMg).
    Fukttransport i skarvskum2002Report (Refereed)
  • 2043.
    Bergström, Gunnar
    et al.
    Göteborg (BMg).
    Forsaeus Nilsson, Stefan
    Göteborg (BMg).
    Sällberg, Sven-Erik
    Göteborg (BMg).
    Tightness of joints in coarse grained backfill material2002Conference paper (Other academic)
  • 2044.
    Bergström, Gunnar
    et al.
    Göteborg (BMg).
    Forsaeus Nilsson, Stefan
    Göteborg (BMg).
    Sällberg, Sven-Erik
    Göteborg (BMg).
    Utvändigt skydd hos fjärrvärmerörsskarvar2002Report (Refereed)
  • 2045.
    Bergström, Gunnar
    et al.
    Göteborg (BMg).
    Forsaeus Nilsson, Stefan
    Göteborg (BMg).
    Sällberg, Sven-Erik
    Göteborg (BMg).
    Vattenläckage genom otät mantelrörsskarv2001Report (Refereed)
  • 2046.
    Bergström, Gunnar
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik.
    Karlsson, Jonas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik.
    PERMEA. En utrustning för kontroll av vattenpermeabiliteten hos dräneringsskivor.1995Report (Refereed)
  • 2047.
    Bergström, Gunnar
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik.
    Karlsson, Jonas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik.
    Vattenpermeabilitet hos sammantryckta dräneringsskivor.1995Report (Refereed)
  • 2048.
    Bergström, Gunnar
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik.
    Nilsson, Stefan
    Förläggning av gasrör av polyeten i befintliga massor.1999Report (Refereed)
  • 2049.
    Bergström, J.
    et al.
    Forms of Sustainability.
    Mazé, Ramia
    RISE, Swedish ICT, Interactive Institute. Design Research Unit.
    Redström, Johan
    Forms of Sustainability.
    Vallgårda, Anna
    Forms of Sustainability.
    Symbiots: Conceptual interventions into energy systems2009In: Proceedings of NORDES, 2009, 10, , p. 10Conference paper (Refereed)
    Abstract [en]

    Symbiots set out to examine values such as ease-of-use, comfort, and rationality assumed within conventions of ‘good design’, in order to expose issues related to energy consumption and current human- (versus eco-) centered design paradigms. Exploring re-interpretations of graphical patterns, architectural configurations and electrical infrastructure typical in Swedish cities, Symbiots takes the form of a photo series in the genre of contemporary hyper-real art photography. Painting a vivid picture of alternatives to current local priorities around energy consumption, the three design concepts depicted are strangely familiar, alternatively humorous and sinister.

  • 2050.
    Bergström, Jan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, JTI Institutet för Jordbruks- och Miljöteknik.
    Värmeavlastning i förarhytter.: Studier i utrustning1979Report (Refereed)
38394041424344 2001 - 2050 of 20511
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