Change search
Refine search result
2345678 201 - 250 of 2745
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.
  • 201.
    Bengtson, Arne
    et al.
    RISE, Swerea, Swerea KIMAB.
    Sedlakova, Miroslava
    RISE, Swerea, Swerea KIMAB.
    Optical Emission – Pulse Distribution Analysis (PDA/OES) for applications to Aluminium alloys2012Report (Refereed)
    Abstract [en]

    The technique PDA/OES is briefly reviewed. It is based on detection of the signals from individual sparks in OES analysis, which usually comprises a few thousand sparks in each burn. Sparks hitting inclusions/particles of characteristic elemental composition give rise to “outliers” of higher intensity for “marker” elements characteristic of the particle type. The outliers are extracted by statistical analysis, and processed by the software to identify and quantify the particles. PDA/OES is used mainly in the steel industry, where the main interest is to detect and analyse non-metallic inclusions (NMI). In this work, PDA/OES has been tested for applicability to aluminium alloys. In this case the main interest is metallic particles, but there are also some types of NMI’s of interest. It was found that PDA functions in the same way as in steels, but there are several factors limiting the applicability. Firstly, the smallest detectable particles are about 1 μm diameter, and the particle number density should not exceed about 20000/mm3 for PDA to detect then as individual particles. In aluminium, many particles (precipitates) of interest are much smaller and present in much higher number densities. Secondly, the elements present in the metallic particles also exist as dissolved in the surrounding metal, giving a high and noisy background which limits the possibility to detect signals from the particles as outliers. These constraints has limited the applicability to metallic particles in the several μm range, using Fe as the “marker” element. However, for certain types of NMI it is likely that very small particles down to 1 μm can be detected. The experimental work has shown that the scanning spark technique OPA can provide additional useful analytical information. Macroscopic segregation at the mm – several cm ranges can rapidly be investigated in two dimensions. In combination with PDA, macroscopic “clusters” of particles can be mapped.The spark optical emission techniques PDA/OES and Original Position Analysis (OPA) have been investigated for application to aluminium alloys. PDA/OES has been optimised for detection and quantification of metallic particles in the several µm range with. The OPA technique has been evaluated for rapid determination of macroscopic segregation.

  • 202.
    Bengtson, Arne
    et al.
    RISE, Swerea, Swerea KIMAB.
    Sedlakova, Miroslava
    RISE, Swerea, Swerea KIMAB.
    Didriksson, R.
    SSAB EMEA.
    Rapid inclusion characterisation by pulse distribution analysis optical emission spectroscopy-recent development2013In: Yejin Fenxi/Metallurgical Analysis, ISSN 10007571, Vol. 33, no 1, p. s.7-12Article in journal (Refereed)
    Abstract [zh]

    The purpose of the work is to further develop and validate the optical emission method pulse distribution analysis (PDA) for rapid inclusion characterisation in steel production. The experimental work was focused on investigation of several operational parameters: spark energy, spark frequency and time gating of signal acquisition. The results showed that a low spark energy improves the detection limit, but at the expense of measuring statistics due to a smaller sample volume. The measuring frequency proved to have no significant influence on the analytical results, but several existing instruments cannot handle the highest spark frequencies above about 300 Hz in PDA mode due to limitations in the electronics. Investigation of time gating (TRS) gave only a marginal improvement in the detection limit of Si outliers above the metallic content. The work also revealed that there is a risk to detect "false" outliers due to asymmetric intensity distributions. This has resulted in the development of more advanced algorithms for outlier detection, increasing the accuracy of the method. Another limitation found is that the particle number density must not exceed about 10 000 inclusions/mm3 for the method to effectively detect single inclusions. A method to overcome this limitation has been suggested, but not yet evaluated. The accuracy of quantitative determination of the Al content in inclusions has been verified by reference methods. In conclusion, it has been demonstrated that state-of-the-art PDA is a very powerful technique for rapid inclusion characterisation in steels. Furthermore, the speed of analysis is sufficiently high for process feedback and controllable.

  • 203.
    Bengtson, Arne
    et al.
    RISE, Swerea, Swerea KIMAB.
    Vainik, Rein
    RISE, Swerea, Swerea KIMAB.
    Comparison of GD-MS and LA-ICPMS direct solid sampling techniques for trace elemental analysis of steels2013Report (Refereed)
    Abstract [sv]

    The objective of this project is to evaluate commercially available techniques for trace elemental analysis of steels using direct solid sampling. Such methods have the potential to increase sample throughput and thereby reduce analysis costs. Glow Discharge Mass Spectrometry (GD-MS) and Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICPMS) were evaluated. Five certified reference materials (CRM) were selected for the experimental work; a high purity iron, a carbon steel and three high alloy steels. For both types of instruments, the sample set was first used for calibration, then run as unknowns several times in order to get sufficient statistics for the evaluation. The GD-MS measurements were carried out at the Thermo Fisher Scientific applications laboratory in Bremen. The LA-ICPMS work was carried out at KIMAB. Prior to the measurements reported here, the effects of varying instrumental parameters of LA-ICPMS were investigated in order to develop a suitable method for steels. The results show that both techniques are powerful methods for simultaneous determination of a large number of trace elements in steels. A limitation is that none of the techniques is capable of analysing C, N and O, due to gas leaks and contamination from materials in the sources. The overall performance in terms of precision and detection limits is better for GD-MS, but for several applications LA-ICPMS provides sufficient performance. Both techniques have instrumentally limited detection limits at the ppb level or below, but the results on the test samples mostly give considerably higher standard deviations, also at very low concentration levels. Therefore, the analytical accuracy for traces is more limited than one would expect based on the instrumental capabilities; typically in the low ppm range or slightly below. The most likely reason for this is the combination of material inhomogeneity and small sampling volumes. This affects LA-ICPMS the most, due to considerably lower sampling volume than GD-MS.

  • 204.
    Bengtson, Arne
    et al.
    RISE, Swerea, Swerea KIMAB.
    Vainik, Rein
    RISE, Swerea, Swerea KIMAB.
    Synthetic standards for determination of trace elements in steels by solid sampling techniques2015Report (Refereed)
    Abstract [en]

    Accurate determination of trace elements in steels is of importance for several reasons. Some trace elements are added on purpose to influence the metallurgy of the steel, and it is important to control the content to the correct level. Other trace elements are deleterious to certain steel properties and must be controlled to be below maximum levels in order to ensure the quality. In more recent years, national and international legislation demand from steel producers to declare the content of certain environmentally hazardous elements, mainly heavy metals such as Hg, Pb and Cd. Multi-element techniques based on direct solid sampling is of great interest due to the short analysis times, but there is a lack of suitable reference materials (RM) for calibration. Bundesanstalt für Materialprüfung (BAM) in Berlin has therefore developed a technique to produce synthetic solid RM’s for trace analysis. The technique is based on mixing metal powder with small amounts of trace elements in liquid solution, drying and compacting the powder into solid briquettes. A few stainless steel RM’s produced at BAM were used at KIMAB to determine Ce, La, Nd and Pr in a stainless steel CRM, using an LA-ICPMS instrument. The results showed very good agreement with certified values. Six RM’s of the same type were subsequently prepared at KIMAB, doped with Pb, Cd and Hg at levels from 0,1 μg/g to 30 μg/g. The RM’s were first analysed by wet chemical ICP-MS at ALS in Luleå. The results showed nearly 100% recoveries of Pb and Cd, while most of the Hg had been lost in the sample preparation. The samples were then used to calibrate the LA-ICPMS instrument for Pb and Cd. It was found that the signals from the top surface of the samples were very high, indicating a considerable degree of “elemental fractionation. A “preburn” in the form of an ablation linear scan across the sample surface was therefore needed prior to the analysis scan. Very good linear calibration curves were obtained for Pb and Cd, but with apparently higher background levels than in solid steel. Three stainless steels with previously determined contents of Pb just below 2 μg/g were analysed together with the synthetic RM’s, giving intensities significantly below the calibration curve. Assuming a zero background level give calculated mass fractions in near agreement with certified values, but this is not a satisfactory calibration method. It is therefore concluded that in present form, synthetic RM’s are only reliable as calibration samples for LA-ICPMS measurements at trace levels larger than 10 μg/g. Further work is necessary in order to reduce this limit

  • 205.
    Bengtsson, Andreas
    et al.
    RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.
    Bengtsson, Jenny
    RISE Research Institutes of Sweden, Materials and Production, Polymeric Materials and Composites.
    Jedvert, Kerstin
    RISE Research Institutes of Sweden, Materials and Production, Polymeric Materials and Composites.
    Kakkonen, Markus
    Fibrobotics Oy, Finland.
    Tanhuanpää, Olli
    Fibrobotics Oy, Finland.
    Brännvall, Elisabet
    RISE Research Institutes of Sweden, Bioeconomy and Health.
    Sedin, Maria
    RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.
    Continuous Stabilization and Carbonization of a Lignin-Cellulose Precursor to Carbon Fiber2022In: ACS Omega, E-ISSN 2470-1343, Vol. 7, no 19, p. 16793-16802Article in journal (Refereed)
    Abstract [en]

    The demand for carbon fibers (CFs) based on renewable raw materials as the reinforcing fiber in composites for lightweight applications is growing. Lignin-cellulose precursor fibers (PFs) are a promising alternative, but so far, there is limited knowledge of how to continuously convert these PFs under industrial-like conditions into CFs. Continuous conversion is vital for the industrial production of CFs. In this work, we have compared the continuous conversion of lignin-cellulose PFs (50 wt % softwood kraft lignin and 50 wt % dissolving-grade kraft pulp) with batchwise conversion. The PFs were successfully stabilized and carbonized continuously over a total time of 1.0-1.5 h, comparable to the industrial production of CFs from polyacrylonitrile. CFs derived continuously at 1000 °C with a relative stretch of-10% (fiber contraction) had a conversion yield of 29 wt %, a diameter of 12-15 μm, a Young's modulus of 46-51 GPa, and a tensile strength of 710-920 MPa. In comparison, CFs obtained at 1000 °C via batchwise conversion (12-15 μm diameter) with a relative stretch of 0% and a conversion time of 7 h (due to the low heating and cooling rates) had a higher conversion yield of 34 wt %, a higher Young's modulus (63-67 GPa) but a similar tensile strength (800-920 MPa). This suggests that the Young's modulus can be improved by the optimization of the fiber tension, residence time, and temperature profile during continuous conversion, while a higher tensile strength can be achieved by reducing the fiber diameter as it minimizes the risk of critical defects. © 2022 The Authors. 

  • 206.
    Bengtsson, Andreas
    et al.
    KTH Royal Institute of Technology, Sweden.
    Bengtsson, Jenny
    RISE - Research Institutes of Sweden (2017-2019), Materials and Production, IVF.
    Sedin, Maria
    RISE - Research Institutes of Sweden (2017-2019), Bioeconomy, Papermaking and Packaging.
    Sjöholm, Elisabeth
    RISE - Research Institutes of Sweden (2017-2019), Bioeconomy, Biobased Materials.
    Carbon Fibers from Lignin-Cellulose Precursors: Effect of Stabilization Conditions2019In: ACS Sustainable Chemistry and Engineering, E-ISSN 2168-0485, Vol. 7, no 9, p. 8440-8448Article in journal (Refereed)
    Abstract [en]

    There is an increasing demand for lightweight composites reinforced with carbon fibers (CFs). Due to its high availability and carbon content, kraft lignin has gained attention as a potential low-cost CF precursor. CFs with promising properties can be made from flexible dry-jet wet spun precursor fibers (PFs) from blends (70:30) of softwood kraft lignin and fully bleached softwood kraft pulp. This study focused on reducing the stabilization time, which is critical in CF manufacturing. The impact of stabilization conditions on chemical structure, yield, and mechanical properties was investigated. It was possible to reduce the oxidative stabilization time of the PFs from about 16 h to less than 2 h, or even omitting the stabilization step, without fusion of fibers. The main reactions involved in the stabilization stage were dehydration and oxidation. The results suggest that the isothermal stabilization at 250 °C override the importance of having a slow heating rate. For CFs with a commercial diameter, stabilization of less than 2 h rendered in tensile modulus 76 GPa and tensile strength 1070 MPa. Impregnation with ammonium dihydrogen phosphate significantly increased the CF yield, from 31-38 to 46-50 wt %, but at the expense of the mechanical properties.

    Download full text (pdf)
    fulltext
  • 207.
    Bengtsson, Andreas
    et al.
    RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.
    Landmér, Alice
    RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.
    Norberg, Lars
    RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.
    Yu, Shun
    RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.
    Ek, Monica
    KTH Royal Institute of Technology, Sweden.
    Brännvall, Elisabet
    KTH Royal Institute of Technology, Sweden.
    Sedin, Maria
    RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.
    Carbon Fibers from Wet-Spun Cellulose-Lignin Precursors Using the Cold Alkali Process2022In: Fibers, ISSN 2079-6439, Vol. 10, no 12, article id 108Article in journal (Refereed)
    Abstract [en]

    In recent years, there has been extensive research into the development of cheaper and more sustainable carbon fiber (CF) precursors, and air-gap-spun cellulose-lignin precursors have gained considerable attention where ionic liquids have been used for the co-dissolution of cellulose and lignin. However, ionic liquids are expensive and difficult to recycle. In the present work, an aqueous solvent system, cold alkali, was used to prepare cellulose-lignin CF precursors by wet spinning solutions containing co-dissolved dissolving-grade kraft pulp and softwood kraft lignin. Precursors containing up to 30 wt% lignin were successfully spun using two different coagulation bath compositions, where one of them introduced a flame retardant into the precursor to increase the CF conversion yield. The precursors were converted to CFs via batchwise and continuous conversion. The precursor and conversion conditions had a significant effect on the conversion yield (12–44 wt%), the Young’s modulus (33–77 GPa), and the tensile strength (0.48–1.17 GPa), while the precursor morphology was preserved. Structural characterization of the precursors and CFs showed that a more oriented and crystalline precursor gave a more ordered CF structure with higher tensile properties. The continuous conversion trials highlighted the importance of tension control to increase the mechanical properties of the CFs. © 2022 by the authors.

  • 208.
    Bengtsson, Andreas
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Bioeconomy, Biorefinery and Energy. KTH Royal institute of technology, Sweden.
    Sjöholm, Elisabeth
    RISE - Research Institutes of Sweden (2017-2019), Bioeconomy, Biobased Materials.
    Conditions for the stabilisation of lignin-cellulose prefibres for carbon fibre production2018In: 15th European workshop on lignocellulosics and pulp: Proceedings for poster presentations, 2018, p. 111-114Conference paper (Other academic)
    Abstract [en]

    Stabilisation of the prefibre is a time-consuming step in carbon fibre (CF) production. In this paper the stabilisation condition of dry-jet wet-spun lignin-cellulose (LC) prefibres (70:30  t%) are reported. The impact of prefibre-impregnation by ammonium dihydrogen phosphate (ADHP) and various thermal conditions were evaluated by measuring the yield and mechanical properties of the final CFs. The addition of ADHP improved the CF yields from 32-40 wt% to 45-47 wt% but had a slight negative impact on the tensile modulus (TM) whereas no significant difference in tensile strength (TS) was observed. The absence of fibre fusion and glass transition temperature (Tg) indicate successful stabilisation of all prefibres. This implies possibilities of using short stabilisation times of LC prefibres in CF production.

  • 209.
    Bengtsson, Emanuel
    RISE Research Institutes of Sweden, Materials and Production, Product Realisation Methodology.
    Livscykelanalys av stenskottsåtgärder2024Report (Other academic)
    Abstract [sv]

    Syftet med denna studie var att utvärdera miljöpåverkan från åtgärder som stenskottsskador på vindrutor kan ge upphov till i form av byte respektive reparation av en ruta. Studien omfattade hela livscykeln från vagga till grav med fokus på klimatpåverkan, men inkluderade även fler miljöpåverkanskategorier. Den funktionella enheten definierades som att åtgärda en vindruta på 15 kg med stenskottsskada genom antingen reparation eller byte av rutan. För reparation inkluderades transport av fordon till och från verkstad samt energi- och materialåtgång under själva reparationen i verkstaden. Byte omfattade i sin tur transport av fordon till och från verkstad, tillverkning av ny ruta, transport av ny ruta till verkstad, energi- och materialåtgång vid själva bytet, samt avfallshantering av den utbytta rutan. Resultaten från denna livscykelanalys visade på tydliga miljömässiga fördelar med att reparera jämfört med att byta en stenskottsskadad vindruta. Baserat på de grundantaganden som gjordes beräknades ett byte ge upphov till en klimatpåverkan på omkring 88 kg CO2-ekv och en reparation omkring 18 kg CO2-ekv. Det innebär en besparing på cirka 70 kg CO2-ekv och att en ruta kan repareras fyra gånger innan klimatpåverkan överstiger den vid ett byte. Majoriteten av påverkan vid ett byte tillskrevs tillverkningen av rutan (ca 56%), följt av transporten av fordonet till och från verkstaden (ca 20%), samt transporten av rutan till verkstaden (ca 14%). Avfallshanteringen och själva bytet på verkstaden hade båda liten påverkan. För en reparation orsakades nästan hela påverkan av transporten av fordonet till och från verkstaden (ca 97%), medan själva reparationsprocessen gav försumbart bidrag. Om flera reparationer genomförs för att undvika ett byte är det därför främst transporten av fordonet till och från verkstaden som är viktig att beakta och minimera för att undvika att reparation ger högre påverkan än byte. En liknande trend som för klimatpåverkan observerades även för miljöpåverkanskategorierna försurning, marin övergödning, terrester övergödning, fotokemisk ozonbildning, fossil resursanvändning och vattenanvändning, där en reparation motsvarade 19-30% av påverkan från ett byte. Övriga studerade kategorier i form av sötvattenövergödning, ozonförtunning och resursanvändning av metaller och mineral visade en mindre skillnad, där en reparation motsvarade 45-52% av påverkan från ett byte. Den mindre skillnaden orsakades av transporten till och från verkstaden, som antogs vara samma oavsett åtgärd. Sammanfattningsvis pekade dessa resultat på att åtgärder mot att reducera klimatpåverkan också verkar ge positiva effekter på andra miljöaspekter. Känslighetsanalyserna som genomfördes identifierade transporten av fordonet till och från verkstaden som en viktig faktor att beakta. Distansen hade stor betydelse för den totala påverkan, men även fordonstyp och drivlina. Transporten av en ny ruta till verkstaden identifierades också som en viktig parameter att ta hänsyn till. Denna transport påverkades i sin tur av vikten på rutan, ytterligare en parameter med signifikant påverkan på resultatet vid byte av ruta. Vidare visade känslighetsanalyserna att så länge en energimix med relativt låg klimatpåverkan används, som exempelvis en svensk, har både själva bytes- och reparationsprocessen liten påverkan. Beträffande avfallshanteringen identifierades viss potential i att återvinna glaset genom den systemexpansion som genomfördes, något som motiverar fortsatt strävan mot återvinning av vindrutor. I övrigt syntes inga stora skillnader i resultat beroende på hur den utbytta rutan avfallshanteras, givet den cut-off-metodik som studien byggde på.

    Download full text (pdf)
    fulltext
  • 210.
    Bengtsson, Felix
    et al.
    Uppsala University, Sweden.
    Pehlivan, Ilknur Bayrak
    Uppsala University, Sweden.
    Österlund, Lars
    Uppsala University, Sweden.
    Karlsson, Stefan
    RISE Research Institutes of Sweden, Built Environment, Building and Real Estate.
    Alkali ion diffusion and structure of chemically strengthened TiO2 doped soda-lime silicate glass2022In: Journal of Non-Crystalline Solids, ISSN 0022-3093, E-ISSN 1873-4812, Vol. 586, p. 121564-121564, article id 121564Article in journal (Refereed)
    Abstract [en]

    Diffusion kinetics and structural properties of chemically strengthened titania-doped soda-lime silicate glasses were studied by depth-resolved X-ray photoelectron spectroscopy, Raman spectroscopy and spectrophotometry. The glasses were ion exchanged, whereby Na+ in the glass was replaced by K+ in a molten salt bath, at four different treatment temperatures between 350 and 500 °C. The alkali diffusion coefficient, DK-Na, and corresponding activation energy were calculated to be between 3.26×10−12 and 4.47×10−11 cm2s−1 and between 101.1 kJmol−1 and 105.6 kJmol−1, respectively. DK-Na was observed to decrease as the TiO2 concentration was increased. Raman analysis showed Q3-silicate species with different bond lengths, which was attributed to surface compressive stresses, and increasing Si-O-Si bond angle with increasing ion exchange temperature. Ti3+ ions exist as a minor species in the glasses and its concentration depends on the TiO2 content. Deconvolution of the optical absorption spectra reveals Jahn-Teller compressive distortion of the Ti3+ octahedral coordination.

    Download full text (pdf)
    fulltext
  • 211.
    Bengtsson, Felix
    et al.
    Uppsala University.
    Pehlivan, Ilknur Bayrak
    Uppsala University.
    Österlund, Lars
    Uppsala University.
    Karlsson, Stefan
    RISE - Research Institutes of Sweden (2017-2019), Built Environment, Building Technology.
    Dataset: Alkali Ion diffusion and structure of chemically strengthened TiO2 doped soda-lime silicate glass2022Data set
    Abstract [en]

    Diffusion kinetics and structural properties of chemically strengthened titania-doped soda-lime silicate glasses were studied by depth-resolved X-ray photoelectron spectroscopy, Raman spectroscopy and spectrophotometry.

    Chemical strengthening (CS) is frequently used to strengthen thin glasses. CS of glass is based on ion exchange of larger ions from a molten salt into glass. Both the ion and counter ion are conventionally monovalent alkali ions.

    Diffusion kinetics and structural properties of chemically strengthened titania-doped (TiO2) soda-lime silicate (SLS) glasses were studied by depth-resolved X-ray photoelectron spectroscopy, Raman spectroscopy and spectrophotometry. The glasses were ion exchanged, whereby Na+ in the glass was replaced by K+ in a molten salt bath, at four different treatment temperatures between 350 and 500 °C.

    The following samples were prepared and analyzed by X-ray Photoelectron Spectroscopy (XPS): (1) SLS, (2) 4.7% TiO2, and (3) 9.9% TiO2. The ion exchange procedure was performed for 5 h at four different temperatures below Tg (350, 400, 450 and 500 °C). Before XPS measurements, the samples were wet-etched using hydrofluoric (HF) acid to produce samples with six different etching depths.

    The Raman scattered light was detected in the backscattering configuration employing linear polarization and 2400 lines/mm grating, and a 100x objective lens. Depth profile spectra were collected at six different depths of 0, 10, 20, 30, 40, and 50 µm for each glass sample, employing 12 scans with a 10 s exposure time for each scan.

    Spectrophotometric measurements were conducted before and after K+/Na+ ion-exchange treatmeatment for 5 h at 500 °C, collected between 300 and 2500 nm.

  • 212.
    Bengtsson, Jenny
    et al.
    RISE Research Institutes of Sweden, Materials and Production, Polymeric Materials and Composites.
    Bengtsson, Andreas
    RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.
    Ulmefors, Hanna
    RISE Research Institutes of Sweden, Materials and Production, Polymeric Materials and Composites.
    Sedin, Maria
    RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.
    Jedvert, Kerstin
    RISE Research Institutes of Sweden, Materials and Production, Polymeric Materials and Composites.
    Preventing fiber-fiber adhesion of lignin-cellulose precursors and carbon fibers with spin finish application2023In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434XArticle in journal (Refereed)
    Abstract [en]

    Adhesion of fibers within a spun tow, including carbon fibers and precursors, is undesirable as it may interrupt the manufacturing process and entail inferior fiber properties. In this work, softwood kraft lignin was used together with a dissolving pulp to spin carbon fiber precursors. Lignin-cellulose precursors have previously been found to be prone to fiber fusion, both post-spinning and during carbon fiber conversion. In this study, the efficiency of applying different kinds of spin finishes, with respect to rendering separable precursors and carbon fibers, has been investigated. It was found that applying a cationic surfactant, and to a similar extent a nonionic surfactant, resulted in well separated lignin-cellulose precursor tows. Furthermore, the fiber separability after carbon fiber conversion was evaluated, and notably, precursors treated with a silicone-based spin finish generated the most well-separated carbon fibers. The underlying mechanism of fiber fusion post-spinning and converted carbon fibers is discussed. 

  • 213.
    Bengtsson, Jenny
    et al.
    RISE Research Institutes of Sweden, Materials and Production, Chemistry, Biomaterials and Textiles. Chalmers University of Technology, Sweden.
    Jedvert, Kerstin
    RISE Research Institutes of Sweden, Materials and Production, Chemistry, Biomaterials and Textiles.
    Köhnke, Tobias
    RISE Research Institutes of Sweden, Materials and Production, Chemistry, Biomaterials and Textiles.
    Theliander, Hans
    Chalmers University of Technology, Sweden.
    The challenge of predicting spinnability: Investigating benefits of adding lignin to cellulose solutions in air-gap spinning2021In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 138, no 26, article id 50629Article in journal (Refereed)
    Abstract [en]

    In this study, the underlying mechanism for improved spinnability when mixing lignin and cellulose in solution was investigated. Co-processing of lignin and cellulose has previously been identified as a potential route for production of inexpensive and bio-based carbon fibers. The molecular order of cellulose contributes to the strength of the fibers and the high carbon content of lignin improves the yield during conversion to carbon fibers. The current work presents an additional benefit of combining lignin and cellulose; solutions that contain both lignin and cellulose could be air-gap spun at substantially higher draw ratios than pure cellulose solutions, that is, lignin improved the spinnability. Fibers were spun from solutions containing different ratios of lignin, from 0 to 70 wt%, and the critical draw ratio was determined at various temperatures of solution. The observations were followed by characterization of the solutions with shear and elongational viscosity and surface tension, but none of these methods could explain the beneficial effect of lignin on the spinnability. However, by measuring the take-up force it was found that lignin seems to stabilize against diameter fluctuations during spinning, and plausible explanations are discussed

  • 214.
    Bengtsson, Jenny
    et al.
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Jedvert, Kerstin
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Köhnke, Tobias
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Theliander, T
    Coagulation of dry-jet wet-spun lignin-based carbon fibre precursors2018In: Proceedings of the 15th European workshop on lignocellulosics and pulp, 2018, p. 123-126Conference paper (Refereed)
  • 215.
    Bengtsson, Jenny
    et al.
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Olsson, Carina
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Idström, Alexander
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Köhnke, Tobias
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Impact of non-solvents in the tetrabutylammonium acetate: dimethyl sulfoxide-cellulose system2016In: The 7th Workshop on cellulose, regenerated cellulose and cellulose derivatives, 2016, p. 19-22Conference paper (Other academic)
    Abstract [en]

    This work examines the potential of tetrabutylammonium acetate: dimethyl sulfoxide (TBAAc:DMSO) as a solvent used in a process for producing man-made cellulose fibers. The tolerance towards nonsolvents is an important step to evaluate the recyclability of the solvent. TBAAc:DMSO was in this work further confirmed to be an efficient solvent for cellulose. Non-solvent tolerance depended on cellulose concentration, TBAAc:DMSO ratio and type of non-solvent. There was no significant change in mechanical properties for filaments regenerated from solutions containing 2 wt% non-solvent compared to those spun from virgin solvent. With 4 wt% ethanol present in solution very brittle filaments were produced, not suitable for use as textile fibers.

  • 216.
    Bengtsson, Jenny
    et al.
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Olsson, Carina
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Köhnke, Tobias
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Bialik, Erik
    Lund University, Sweden.
    Elucidating the effect of non-solvents on the TBAAc/DMSO-cellulosesolvent system2017In: Cellulosic material properties and industrial potential: Final meeting in COST FP1205, 2017Conference paper (Other academic)
  • 217.
    Bengtsson, Jenny
    et al.
    RISE Research Institutes of Sweden, Materials and Production, Polymeric Materials and Composites.
    Peterson, Anna
    RISE Research Institutes of Sweden, Materials and Production, Polymeric Materials and Composites.
    Idström, Alexander
    Chalmers University of Technology, Sweden.
    de la Motte, Hanna
    RISE Research Institutes of Sweden, Materials and Production, Polymeric Materials and Composites.
    Jedvert, Kerstin
    RISE Research Institutes of Sweden, Materials and Production, Polymeric Materials and Composites.
    Chemical Recycling of a Textile Blend from Polyester and Viscose, Part II: Mechanism and Reactivity during Alkaline Hydrolysis of Textile Polyester2022In: Sustainability, E-ISSN 2071-1050, Vol. 14, no 11, article id 6911Article in journal (Refereed)
    Abstract [en]

    Chemical recycling of textiles holds the potential to yield materials of equal quality and value as products from virgin feedstock. Selective depolymerization of textile polyester (PET) from regenerated cellulose/PET blends, by means of alkaline hydrolysis, renders the monomers of PET while cellulose remains in fiber form. Here, we present the mechanism and reactivity of textile PET during alkaline hydrolysis. Part I of this article series focuses on the cellulose part and a possible industrialization of such a process. The kinetics and reaction mechanism for alkaline hydrolysis of polyester packaging materials or virgin bulk polyester are well described in the scientific literature; however, information on depolymerization of PET from textiles is sparse. We find that the reaction rate of hydrolysis is not affected by disintegrating the fabric to increase its surface area. We ascribe this to the yarn structure, where texturing and a low density assures a high accessibility even without disintegration. The reaction, similar to bulk polyester, is shown to be surface specific and proceeds via endwise peeling. Finally, we show that the reaction product terephthalic acid is pure and obtained in high yields. © 2022 by the authors. 

  • 218.
    Berglin, N.
    et al.
    RISE, Innventia.
    Lovell, A.
    RISE, Innventia.
    Delin, L.
    Tormala, J.
    The 2010 reference mill for kraft market pulp2011Conference paper (Refereed)
  • 219.
    Berglin, Niklas
    et al.
    RISE, Innventia.
    Tomani, Per
    RISE, Innventia.
    Olowson, P.
    Hultberg, T.
    Persson, S.
    Experiences from feeding and co-firing of lignin powder in a lime kiln2010In: International Chemical Recovery Conference, 2010, Vol. 1, p. 175-187Conference paper (Refereed)
    Abstract [en]

    A significant part of the fossil fuel oil consumption at a pulp mill today is related to combustion in the lime kiln. Therefore, replacing fuel oil with lignin in this application has been one of the most important issues in the FRAM2 (Future Resource-Adapted Mill) research program coordinated by Innventia (formerly STFl-Packforsk) and funded by Sodra and other partners. A full-scale trial to fire lignin powder in a lime kiln was carried out at the Sodra Cell Monsteras mill, as part of the research program. In total 37 tonnes of lignin was co-fired with fuel oil. For part of the trial the kiln was operated on 100 % lignin. The experiences from the trial imply that it is possible to achieve stable and continuous operation of a lime kiln when lignin is used as the main fuel. The temperature levels in the kiln are of the same order of magnitude as when firing fuel oil or wood powder. Sulfur capture by the lime is very efficient, but there is a threshold above which S02 emissions increase rapidly. In the trial this step change occurred when going from 90 % to 100 % lignin firing. Based on the trial results, it is possible to produce lime with consistent quality when firing lignin, and the temperature reached in the burner zone is sufficient for proper sintering of the lime nodules. White liquor can be produced from the lime with the same causticizing efficiency and at the same rate as during normal operation. The mill operators also commented that it was easier to control the performance of the kiln when co-firing lignin and oil compared to the normal operation with co-firing of bark and oil.

  • 220.
    Berglin, Niklas
    et al.
    RISE, STFI-Packforsk.
    Tomani, Per
    RISE, STFI-Packforsk.
    Salman, H.
    Svärd, S. H.
    Amand, L. -E
    Pilot-scale combustion studies with kraft lignin as a solid biofuel2008In: Engineering, Pulping and Environmental Conference 2008, TAPPI Press, 2008, Vol. 4, p. 2571-2580Conference paper (Refereed)
    Abstract [en]

    Processing of kraft lignin precipitated from black liquor to produce a solid biofuel with high energy density and low ash content has been developed in research programs by STFI-Packforsk and partners. In preparation for full-scale combustion trials, tests were carried out on pilot scale in a 150 kW powder burner and in a 12 MWfluidized bed (CFB) boiler. Lignin powder could be fired in a powder burner with good combustion performance after some trimming of the airflows to reduce swirl. Lignin dried to 10 % moisture content was easy to feed smoothly and had less bridging tendencies in the feeding system than wood/bark powder. In the CFB boiler lignin was easily handled and co-fired together with bark. Although the filter cake was broken into smaller pieces and fines the combustion was not disturbed. When co-firing lignin with bark, the sulfur emission increased compared to bark firing only, but most of the sulfur was captured by calcium in the bark ash. Conventional sulfur capture with addition of limestone to the bed was also demonstrated. The sulfur content in the lignin had a significantly positive effect on reducing the alkali chloride content in the deposits, thus reducing the high temperature corrosion risk.

  • 221.
    Berglin, Niklas
    et al.
    RISE, Innventia.
    Tomani, Per
    RISE, Innventia.
    Salman, H.
    Svärd, S.H.
    Ąmand, L.-E.
    Pilot-scale combustion studies with kraft lignin in a powder burner and a CFB boiler2010In: TAPPI Journal, ISSN 0734-1415, Vol. 9, no 6, p. 24-30Article in journal (Refereed)
    Abstract [en]

    Processes have been developed to produce a solid biofuel with high energy density and low ash content from kraft lignin precipitated from black liquor. Pilot-scale tests of the lignin biofuel were carried out with a 150 kW powder burner and a 12 MW circulating fluidized bed (CFB) boiler. Lignin powder could be fired in a powder burner with good combustion performance after some trimming of the air flows to reduce swirl. Lignin dried to 10% moisture content was easy to feed smoothly and had less bridging tendencies in the feeding system than did wood/ bark powder. In the CFB boiler, lignin was easily handled and cofired together with bark. Although the filter cake was broken into smaller pieces and fines, the combustion was not disturbed. When cof ¡ring lignin with bark, the sulfur emission increased compared with bark firing only, but most of the sulfur was captured by calcium in the bark ash. Conventional sulfur capture also occurred with addition of limestone to the bed. The sulfur content in the lignin had a significantly positive effect on reducing the alkali chloride content in the deposits, thus reducing the high temperature corrosion risk. Application: This research is of interest for pulp and paper and energy and utilities companies that want to understand how kraft lignin can be used to replace fuel oil or coal in many combustion applications.

  • 222.
    Berglin, Niklas
    et al.
    RISE, Innventia.
    von Schenck, Anna
    RISE, Innventia.
    Alriksson, Björn
    Hörnberg, Andreas
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Lindstedt, J
    Östman, J
    POLYNOL - chemical intermediates from renewable sources2014Conference paper (Refereed)
  • 223.
    Berglin, Niklas
    et al.
    RISE, Innventia.
    von Schenck, Anna
    RISE, Innventia.
    Hoffstedt, Christian
    RISE, Innventia.
    Co-production of renewable polymers and ethanol from eucalyptus-based pulp mills2012Conference paper (Refereed)
  • 224.
    Berglund, J.
    et al.
    Sandvik Tooling.
    Wiklund, Daniel
    RISE - Research Institutes of Sweden (2017-2019), Materials and Production, IVF.
    Rosén, B.-G.
    Halmstad University.
    A method for visualization of surface texture anisotropy in different scales of observation2011In: Scanning, ISSN 0161-0457, E-ISSN 1932-8745, Vol. 33, no 5, p. 325-331Article in journal (Refereed)
    Abstract [en]

    Anisotropy of functional surfaces can in many practical cases significantly influence the surface function. Tribological contacts in sheet forming and engine applications are good examples. This article introduces and exemplifies a method for visualization of anisotropy. In a single graph, surface texture properties related to the anisotropy as a function of scale are plotted. The anisotropy graph can be used to explain anisotropy properties of a studied surface such as texture direction and texture strength at different scales of observation. Examples of milled steel surfaces and a textured steel sheet surface are presented to support the proposed methodology. Different aspects of the studied surfaces could clearly be seen at different scales. Future steps to improve filtering techniques and an introduction of length-scale analysis are discussed. Copyright © 2011 Wiley Periodicals, Inc.

  • 225.
    Berglund, Johan
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Materials and Production, IVF.
    Blateyron, François
    Digital Surf, France.
    Using SEM quad BSE images for roughness measurement – calibration of reconstructed surfaces2016Conference paper (Other academic)
  • 226.
    Berglund, Johan
    et al.
    RISE Research Institutes of Sweden, Materials and Production, Manufacturing Processes. Chalmers University of Technology, Sweden.
    Holmberg, Jonas
    RISE Research Institutes of Sweden, Materials and Production, Manufacturing Processes.
    Wärmefjord, Kristina
    Chalmers University of Technology, Sweden.
    Söderberg, Rikard
    Chalmers University of Technology, Sweden.
    Detailed evaluation of topographical effects of Hirtisation post-processing on electron beam powder bed fusion (PBF-EB) manufactured Ti-6Al-4V component2024In: Precision engineering, ISSN 0141-6359, E-ISSN 1873-2372, Vol. 85, p. 319-327Article in journal (Refereed)
    Abstract [en]

    Metal additive manufacturing surface topographies are complex and challenging to characterise due to e.g. steep local slopes, re-entrant features, varying reflectivity and features of interest in vastly different scale ranges. Nevertheless, average height parameters such as Ra or Sa are commonly used as sole parameters for characterisation. In this paper, a novel method for selecting relevant parameters for evaluation is proposed and demonstrated using a case study where the smoothing effects after three processing steps of the electro chemical post-process Hirtisation of a metal AM surface are quantified. The method uses a combination of conventional areal texture parameters, multiscale analysis and statistics and can be used to efficiently achieve a detailed and more relevant surface topography characterisation. It was found that the three process steps have different effects on the surface topography regarding the types and sizes of features that were affected. In total, Sdq was reduced by 97 %, S5v was reduced by 81 % and Sa was reduced by 78 %. A surface texture with much lower average roughness, less deep pits and less steep slopes was produced, which is expected to be beneficial for improved fatigue properties.

  • 227.
    Berglund, Johan
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Materials and Production, IVF.
    Kjellberg, Mikael
    IUC Olofström, Sweden.
    Liljengren, Magnus
    IUC Olofström, Sweden.
    Kjellsson, Kenneth
    Volvo Cars, Sweden.
    New Test Method for Detection and Analysis of Burrs and Slivers in Trimming and Punching Aluminium Sheet Metal2014Conference paper (Other academic)
    Abstract [en]

     A large problem when trimming or punching aluminium sheet is thecreation of burrs and slivers which degrade the quality of the produced parts. A semiindustrial test for evaluating trimming of aluminium has been further developed toinclude pre-stressing and pre-straining of the sheet material before trimming. Thesemi-industrial test results now show good correlation to industrial productionoutcomes.

    Download full text (pdf)
    fulltext
  • 228.
    Berglund, M.
    et al.
    Linköping University.
    Harlin, Ulrika
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Gustavsson, M.
    Linköping University.
    Säfsten, K.
    Jönköping University.
    New ways of organizing product introductions2012In: Work, 2012, Vol. 41, no SUPPL.1, p. 4856-4861Conference paper (Refereed)
    Abstract [en]

    The aim of this paper is to describe and reflect on an interactive research approach used to address the challenges on how to improve product introductions, the part of the product realization process associated with the transfer of a product from product development to serial production. In the interactive research approach, research results as well as improvement of practice are given equal importance. The collaboration between researchers and practitioners therefore addresses both the focus and the process of the change. The approach includes four main iterative steps: 1) mapping/diagnosis, 2) feedback of results, 3) participation in development activities, and 4) follow-up/evaluation. The paper reports findings from interactive research in one company within office product industry and one company group, consisting of three company units within the engine industry. Preliminary findings indicate that the participating companies afterwards work in a more structured way with product introductions and that the employees have gained deeper knowledge about product introductions as well as experienced the advantages of working across functional boundaries. Furthermore, the interactive research approach is suitable to run projects from an ergonomics perspective as it focuses on developing both practice and theory, it is human-centered, and it emphasizes broad participation from practitioners. © 2012 - IOS Press and the authors. All rights reserved.

  • 229.
    Bergman, Linda
    et al.
    RISE, Swerea, Swerea MEFOS.
    Larsson, Mikael
    RISE, Swerea, Swerea MEFOS.
    HSC simulations of coal based DR in ULCORED2009In: Revue de métallurgie (Imprimé), ISSN 0035-1563, E-ISSN 1156-3141, Vol. 106, no 10, p. 422-428Article in journal (Refereed)
    Abstract [en]

    The ULCORED coal based concept is simulated based on the production of syngas using existing coal gasification technology. The shifter gives the option to produce CO2-lean H2 from coal/biomass for in plant use. Large CO2 emissions arise on site from the use of natural gas in heating ovens and from the use of electricity in EAF melting. In the case of these coal based systems, production of "excess gas" to be used as fuel gas in various processes will reduce the CO2 emission for the total site.

  • 230.
    Bergström, Sven G
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    An experimental study of the relation between the properties of fresh and hardened concrete1953Report (Refereed)
  • 231.
    Bergström, Sven G
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Forskning och utveckling inom betongteknologin1977Report (Refereed)
  • 232.
    Bergström, Sven G
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Frysförsök med cementbruk1955Report (Refereed)
  • 233.
    Bergström, Sven G
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Influence of frost on the physical and mechanical properties of concrete1976Report (Refereed)
  • 234.
    Bergström, Sven G
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Lagringstemperatur, lagringstid och betonghållfasthet1953Report (Refereed)
  • 235.
    Bergström, Sven G
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Quality control of concrete structures: A symposium : programme and implementation1980Report (Refereed)
  • 236.
    Bergström, Sven G
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Saltskador på betongbeläggningar vintertid1959Report (Refereed)
  • 237.
    Bergström, Sven G
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Skador på siporextak över järnverk1957Report (Refereed)
  • 238.
    Bergström, Sven G
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Stable concrete mixes1951Report (Refereed)
  • 239.
    Bergström, Sven G
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Stämpelbelastade, cirkulära plattor på elastiskt underlag.1946Report (Refereed)
  • 240.
    Bergström, Sven G
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Temperaturbuckling hos cirkulärcylindriska stålskal kringgjutna med betong.1946Report (Refereed)
  • 241.
    Bergström, Sven G
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Temperaturspänningar i betongbeläggningar1950Report (Refereed)
  • 242.
    Bergström, Sven G
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Tillsatsmedel till betong1963Report (Refereed)
  • 243.
    Bergström, Sven G
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Linderholm, Sven
    Dynamisk metod att utröna ytliga marklagers genomsnittliga elasticitetsegenskaper1946Report (Refereed)
  • 244.
    Bergström, Sven G
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Linderholm, Sven
    Investigation of wheel load stresses in concrete pavements1949Report (Refereed)
  • 245.
    Bergström, Sven G
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Linderholm, Sven
    La vibration du béton: Recherches expérimentales1949Report (Refereed)
  • 246.
    Bergström, Sven G
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Möller, Göran
    Materialproblem vid vinterbetongarbeten1962Report (Refereed)
  • 247.
    Bergström, Sven G
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Skarendahl, Åke
    Studies on concrete aggregate1976Report (Refereed)
  • 248.
    Bergström, Sven G
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Warris, Birger
    Kiselstoft för betong1983Report (Refereed)
  • 249.
    Bergström, Sven G
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Örbom, Björn
    Avskalningar på Kungl. Flygförvaltningens betongbeläggningar1956Report (Refereed)
  • 250.
    Bernstad Saraiva, Anna
    et al.
    COPPE UFRJ, Brazil.
    Valle, Rogerio A. B.
    COPPE UFRJ, Brazil.
    Bosque, A.E.S., Jr.
    Fibria CElulose SA, Brazil.
    Berglin, Niklas
    RISE - Research Institutes of Sweden (2017-2019), Bioeconomy. RISE, Innventia.
    von Schenck, A.
    ÅF AB, Sweden.
    Provision of pulpwood and short rotation eucalyptus in Bahia, Brazil: Environmental impacts based on lifecycle assessment methodology2017In: Biomass and Bioenergy, ISSN 0961-9534, E-ISSN 1873-2909, Vol. 105, p. 41-50Article in journal (Refereed)
    Abstract [en]

    Environmental impacts from cultivation of eucalyptus pulpwood and short rotation eucalyptus in northeast Brazil were investigated using lifecycle assessment methodology. The assessment considers all relevant inputs and outputs, as well as direct land use changes, assuming conversion of grassland (pasture) to areas for eucalyptus plantation. Results show that production of pulpwood eucalyptus is beneficial compared to short rotation eucalyptus in relation to all assessed impact categories, except for climate change (greenhouse gas emissions = 47 kg CO2-eq. t DM−1 pulpwood eucalyptus and 35 kg CO2-eq. t DM−1 short rotation eucalyptus). Excluding emissions from direct land use changes would increase overall GWP from investigated systems with around 5–6%, and changing the assumed land-use prior to land conversion is of decisive character for overall GWP-results from the assessed eucalyptus production systems. Modeling of nutrient balances in the short rotation production system shows a potential need to increase the input of mineral fertilizer in order to compensate for nutrient losses. This would increase environmental impacts from the short rotation system, making pulpwood eucalyptus preferable in relation to all assessed impact categories.

2345678 201 - 250 of 2745
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