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  • 51.
    Scheepers, Gerhard
    et al.
    RISE - Research Institutes of Sweden, Bioeconomy, Biobased Materials.
    Olsson, Jörgen
    RISE - Research Institutes of Sweden, Built Environment, Building Technology.
    Lycken, Anders
    RISE - Research Institutes of Sweden, Bioeconomy, Biobased Materials.
    Grahn, Thomas
    RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging.
    Lundqvist, Sven-Olof
    RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
    Hagman, Olle
    Luleå University of Technology, Sweden.
    Hållfasthetsbestämning av virke med en NIR-kamera2017Report (Other academic)
    Abstract [sv]

    SP, Innventia och Luleås Tekniska Universitet har genomfört en förstudie där man undersökte om nära-infrarött (NIR) data kan bidra till säkrare hållfasthetsbestämning av virke. För att göra det behövdes förutom NIR-data, dels data som konventionellt används i sågverk för att göra hållfasthets-uppskattningar, dels referensdata från mekanisk provning.

    Följande data samlades in från 100 granplankor med dimensionen 3600*150*45 mm3:

    1. mått, vikt, och därmed densitet,

    2. egenfrekvenser via dynamisk excitering,

    3. högupplösta NIR-bilder på 2 flatsidor av varje planka,

    4. RGB och fibervinkeldata från flat- och kantsidorna,

    5. röntgentomografibilder,

    6. förstörande böjtestdata, med bestämning av lokal och global E-modul, och

    7. kvalitativ inventering av brottyp och kvistposition.

     

    Databasen är i sig en värdefull resurs och en god grund för fortsatt forskning och utveckling mot kun-skap och tillämpningar baserat på information som hittills inte utvärderats och nyttjats.

    Virkesegenskaper som påverkar hållfasthet, såsom tjurved, kunde identifieras och visualiseras. Andra egenskaper som är viktiga hållfasthetsindikatorer, såsom egenfrekvens och densitet, kunde predikteras med multivariata modeller baserade på NIR-spektraldata. Inledande modellförsök visar att det går att prediktera global E-modul med multivariata modeller baserade på NIR-spektraldata med ungefärlig samma precision som industriell hållfasthetsbedömning med dynamisk excitering. De NIR-data som användes i modelleringen var dock bara medelvärden över hela plankan. Därför finns det god potential för bättre prediktion med mer riktade variabler, som speglar de spatiala variationerna i varje planka, t.ex. runt kvistar, vilket blir ämnet för ett eventuellt fortsättningsprojekt.

    Projektet finansierades av Norrskogs Forskningsstiftelse, Stiftelsen Åforsk, Träcentrum Norr, och Södra Skogsägarnas Stiftelse för Forskning, Utveckling och Utbildning. Individer som medverkade i projektet inkluderar Gerhard Scheepers, Jörgen Olsson, Anders Lycken, Sven-Olof Lundqvist och Thomas Grahn (RISE Bioekonomi); och Olle Hagman (LTU). RemaSawco och JGA i Linneryd hjälpte också med insamlingen av fibervinkeldata.

     

  • 52.
    Sewring, Tor
    et al.
    Chalmers University of Technology, Sweden.
    Zhu, Weizhen
    Chalmers University of Technology, Sweden.
    Sedin, Maria
    RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging.
    Theliander, Hans
    KTH Royal Institute of Technology, Sweden; Chalmers University of Technology, Sweden.
    Predictions of Pair Interaction Potentials between Kraft Lignin Macromolecules in Black Liquors by Utilization of a Modified Poisson-Boltzmann Approach2019In: Industrial & Engineering Chemistry Research, ISSN 0888-5885, E-ISSN 1520-5045, Vol. 58, no 8, p. 3427-3439Article in journal (Refereed)
    Abstract [en]

    In this investigation, a modified Poisson-Boltzmann approach has been used to estimate the mean ion concentration distributions of ionic species present in black liquors around charged kraft lignin macromolecules at industrially relevant conditions. The distributions were utilized to predict the double layer repulsion and, further, predict the overall pair interaction potentials between two kraft lignin macromolecules or particles immersed in the black liquor electrolyte. The properties of softwood black liquors were used as input data to the model. The numerical results predicted the pair interaction potentials to remain repulsive up to salt concentrations of about 2.5 M at pOH 1. The critical coagulation concentration of salt was predicted to decrease as the pOH of the black liquor was increased. The predictions at 65 °C and moderate levels of pOH (3.5) and salt concentration (1.9 M) were found to be in good agreement with previous observations reported in the literature.

  • 53.
    Srinivasa, Prashanth
    et al.
    RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging.
    Nygårds, Mikael
    RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging.
    Hagman, Anton
    RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging.
    Pendergraph, Samuel
    RISE - Research Institutes of Sweden.
    Sundström, Jonas
    RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging.
    On the torsion method for measurement of out-of-plane shear properties2019In: International Paper Physics Conference 2019: preprint proceedings, TAPPI Press, 2019, p. 8-13Conference paper (Other academic)
    Abstract [en]

    Torsional loading with combined out-of-plane compressive loading has been studied for its viability in measurement of out-of-plane shear properties. Paperboards of two qualities were evaluated, namely paperboard A, which was a multiply, while paperboard B was a single ply. Both paperboards were produced on commercial paperboard machines. A total of 24 samples were prepared, 12 of each quality, which were tested under four different load levels. Three different out-of-plane compressive load levels were tested in addition to test without compressive load. Results have been presented from the successful tests in terms of torque versus angle of torsion and shear stress versus shear strain plots. It has been demonstrated that the technique was suitable for out-of-plane shear measurements. An order of magnitude agreement in the values of the properties was obtained in the torsional test method and the rigid block shear tests. Results indicated a possible stable post-peak response in shear loading at sample sizes that would provide material properties comparable with that of a homogeneous test. The torsional setup offered benefit of ease of applying out-of-plane axial loads, both in compression and tension.

  • 54.
    Sturges, Michael
    et al.
    RISE - Research Institutes of Sweden, Bioeconomy, RISE UK Ltd.
    Kay, Martin
    RISE - Research Institutes of Sweden, Bioeconomy, RISE UK Ltd.
    Johansson, Malin
    RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging.
    BioPackLCA – Closing the gap: Extending LCA to reflect the sustainability contributions of bio-based packaging2019Report (Other academic)
    Abstract [en]

    Existing LCA methods (especially impact categories considered) do not always include some of the environmental interventions that are unique to bio-based materials. Subsequently, this report to investigates areas where LCA impact assessment methodology can be enhanced or expanded in order to fully account for the environmental advantages and disadvantages of bio-based packaging materials. The work focuses on impact assessment areas most pertinent to three of the highest-profile environmental policy objectives of the day, i.e. climate change, single-use plastics and microplastics generation. Subsequently, recommendations are made with regards to the application of the global warming potential impact category when conducting LCA studies comparing bio-based and other packaging materials, and proposals are presented for simplified impact categories for littering potential and microplastics generation potential.

  • 55.
    Thorman, Sofia
    et al.
    RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging. Karlstad University, Sweden.
    Ström, Göran
    RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging.
    Gane, Patrick A. C.
    Omya Internatioanl AG, Switzerland ; Aalto University, Finland.
    Impact of non-uniform water absorption on water-interference print mottle in offset printing2018In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 33, no 1, p. 150-163Article in journal (Refereed)
    Abstract [en]

    Print mottle is a serious and yet common print defect in offset printing. An imbalance between the feed of fountain solution and the ability of the paper substrate to absorb and transport this water away from the surface can cause moisture/water interference problems. In the study presented here, we have investigated the uniformity of aqueous absorption and coating structure of pilot-coated papers with different types and dosages of dispersants and linked this to print mottle and uncovered areas (UCA). In earlier studies, the print quality of these papers indicated that a moderate addition of excess dispersant caused ink refusal, ink-lift-off (ink-surface adhesion failure) and water-interference mottle when printing at elevated fountain feed. In the present study, we have shown that a majority of the samples with uneven water/moisture absorption and an uneven burn-out reflectance tended to have more severe printing problems related to surface-moisture/water.An aqueous staining technique was used to characterise the absorption non-uniformities. This method has been developed previously with focus on absorption of flexographic water-based inks but can clearly give relevant information also for offset printing, when it comes to moisture/water interference mottle. .

  • 56.
    Wang, Xin
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Grimoldi, Andrea
    Linköping University, Sweden.
    Håkansson, Karl
    RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
    Fall, Andreas
    RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
    Granberg, Hjalmar
    RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging.
    Mengistie, Desalegn
    Linköping University, Sweden.
    Edberg, Jesper
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Engquist, Isak
    Linköping University, Sweden.
    Nilsson, David
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Berggren, Magnus
    Linköping University, Sweden.
    Gustafsson, Göran
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Anisotropic conductivity of Cellulose-PEDOT:PSS composite materials studied with a generic 3D four-point probe tool2019In: Organic electronics, ISSN 1566-1199, E-ISSN 1878-5530, Vol. 66, p. 258-264Article in journal (Refereed)
    Abstract [en]

    The conductive polymer poly(3,4-ethylenedioxythiphene):poly(styrenesulfonate) (PEDOT:PSS) is widely used in organic electronics and printed electronics due to its excellent electronic and ionic conductivity. PEDOT:PSS films exhibit anisotropic conductivities originating from the interplay of film deposition processes and chemical structure. The previous studies found that high boiling point solvent treated PEDOT:PSS exhibits an anisotropy of 3–4 orders magnitude. Even though both the in-plane and out-of-plane conductivities are important for the device performance, the out-of-plane conductivity is rarely studied due to the complexity with the experiment procedure. Cellulose-based paper or films can also exhibit anisotropic behavior due to the combination of their intrinsic fibric structure and film formation process. We have previously developed a conductive paper based on PEDOT:PSS and cellulose which could be used as the electrodes in energy storage devices. In this work we developed a novel measurement set-up for studying the anisotropy of the charge transport in such composite materials. A tool with two parallel plates mounted with spring loaded probes was constructed enabling probing both lateral and vertical directions and resistances from in-plane and out-of-plane directions to be obtained. The measurement results were then input and analyzed with a model based on a transformation method developed by Montgomery, and thus the in-plane and out-of-plane conductivities could be detangled and derived. We also investigated how the conductivity anisotropy depends on the microstructure of the cellulose template onto which the conductive polymer self-organizes. We show that there is a relatively small difference between the in-plane and out-of-plane conductivities which is attributed to the unique 3D-structure of the composites. This new knowledge gives a better understanding of the possibilities and limitations for using the material in electronic and electrochemical devices.

  • 57.
    Xin, Zhiging
    et al.
    BIGC Beijing Institute of Graphic Communication, China.
    Yan, Meijia
    BIGC Beijing Institute of Graphic Communication, China.
    Gu, Lingya
    BIGC Beijing Institute of Graphic Communication, China.
    Liu, Jianghao
    BIGC Beijing Institute of Graphic Communication, China.
    Liu, Ruping
    BIGC Beijing Institute of Graphic Communication, China.
    Li, Luhai
    BIGC Beijing Institute of Graphic Communication, China.
    Fang, Yi
    BIGC Beijing Institute of Graphic Communication, China.
    Mo, Lixin
    BIGC Beijing Institute of Graphic Communication, China.
    Li, Yaling
    BIGC Beijing Institute of Graphic Communication, China.
    Shen, Yang
    BIGC Beijing Institute of Graphic Communication, China.
    Guolin, Xinzheng
    BIGC Beijing Institute of Graphic Communication, China.
    Li, Mingzhu
    Beijing National Laboratory for Molecular Sciences, China.
    Yang, Li
    RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging.
    Scalable Fabrication of Conductive Lines by Patterned Wettability-Assisted Bar-Coating for Low Cost Paper-Based Circuits2019In: Advanced Materials Interfaces, ISSN 2196-7350, Vol. 6, no 10, article id 1802047Article in journal (Refereed)
    Abstract [en]

    Patterning technology on the paper based on wettability difference for paper-based devices has attracted significant attention for its low cost, easy degradability, and high flexibility. Here, conductive lines are rapidly prepared by patterned wettability-assisted bar-coating for low cost paper-based circuits. It is found that 7 s plasma treatment time for acquiring wettability difference is optimal, which resulted in not only effective splitting of the liquid film but also highly consistent line width with mask. Moreover, low retention force of hydrophobic surface is imperative for self-confinement of the ink into hydrophilic areas, especially for ink with high solid content. The sheet resistance of patterns can reach 5 Ω ◻ −1 after 980 nm laser sintering when using 50 wt% solid content ink with 110 cP viscosity. The geometries of line patterns, i.e., line width and spacing, can be readily tuned by varying the designed size of mask patterns. As-prepared conductive patterns show good conductivity even after 500 bending cycles at 2 mm bending radius. It is believed that this study will provide deeper understanding of wettability difference-assisted patterning process and represents a general strategy for selective wetting, especially for high viscosity ink.

  • 58.
    Xin, Zhiqing
    et al.
    BIGC Beijing Institute of Graphic Communication, China.
    Liu, Jianghao
    BIGC Beijing Institute of Graphic Communication, China.
    Gu, Lingya
    BIGC Beijing Institute of Graphic Communication, China.
    Fang, Yi
    BIGC Beijing Institute of Graphic Communication, China.
    Mo, Lixin
    BIGC Beijing Institute of Graphic Communication, China.
    Yang, Li
    RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging.
    Surface energy guided patterning for printed electronics applications2018In: 45th International IARIGAI conference, 2018Conference paper (Other academic)
    Abstract [en]

    We demonstrated patterning method for silver nanoparticle ink by wire-wound rod coating on commercial paper substrate. The hydrophobic and hydrophilic zones (patterns) on the paper surface were created by combining coating of hydrophobic dispersion with selective plasma treatment using a mask. Thanks to the surface energy difference in different zones, the silver nanoparticle ink self-aligned to form desired patterns, e.g. a matrix of lines of 0.5 mm wide with 0.3 mm spacing.

  • 59.
    Yang, Li
    RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging.
    Detailed analysis of the UV-adjustment techniques used in paper and graphic industries2017In: Color Research and Application, ISSN 0361-2317, E-ISSN 1520-6378, Vol. 42, no 1, p. 19-26Article in journal (Refereed)
    Abstract [en]

    Many commercial materials (papers and boards) contain optical brightening agents also known as fluorescent whitening agents. Adequate adjustment of the UV content of a measurement device (e.g., spectrophotometers) is essential for accurate color measurement. As specified in the ISO standards, the UV content is adjusted against an assigned value of an international reference transfer standard, for example, CIE whiteness (D65/10°) for the CIE illuminant D65 or ISO brightness for the C illuminant. Because of the simplicity, these approaches have gained great popularity in papermaking industry. Yet, there has been little evidence indicating how accurate the total spectral radiance factor corresponding to the single assigned value is reproduced. Hence, we present a method that quantitatively evaluates the accuracy of the UV-adjustment technique, through comparing the total spectral radiance factors obtained from UV adjustment with the assigned ones. This method has been applied to three second-level international reference transfer standard illuminated by three standard illuminants, D65, C, and D50. We found that the major differences between the assigned spectra and those obtained from the UV adjustments occur in the blue band where fluorescence is strong. At a few wavelengths, the differences may be up to 4-5%. Nevertheless, their color differences corresponding to the assigned spectra and those obtained from the UV adjustments are still smaller than unity (1 ΔE*) for all of the illumination conditions. Two instruments using the representative UV adjusting techniques, for example, the conventional UV-adjusting with an adjustable (GG395) UV filter and the numerical UV-filtering, have been studied.

  • 60.
    Yang, Li
    et al.
    RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging.
    Karlsson, Max
    Uppsala University, Sweden.
    Effective method for fast and detailed analysis of holographic patterns over a large area2017In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 56, no 26, p. 7491-7497Article in journal (Refereed)
    Abstract [en]

    An effective method is proposed that enables one to simultaneously analyze details of numerous holographic grating patterns over a large area. Unlike the conventional approaches relying on sophisticated lighting and optical systems and dark environment, only a flatbed scanner is needed. Thanks to the “rotate-scan” measurement strategy, details of the holographic grating patterns can be obtained, e.g., spatial distribution of the grating patterns, interval and orientation of the grating grooves within each grating pattern, and defects of the holographic patterns. The method has been verified by applications to two holographic papers of different grating intervals and orientations. The measured values agree well with those obtained with a light optical microscope (LOM). The proposed method is applicable to both transparent and reflective holographic materials of broad grating periodicity.

  • 61.
    Ye, Xinchen
    et al.
    KTH Royal Institute of Technology, Sweden.
    Junel, Kristina
    RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging.
    Gällstedt, Mikael
    SIG Combibloc, Sweden.
    Langton, Maud
    SLU Swedish University of Agricultural Sciences, Sweden.
    Wei, Xin-Feng
    KTH Royal Institute of Sweden, Sweden.
    Lendel, Christofer
    KTH Royal Institute of Sweden, Sweden.
    Hedenqvist, Mikael S.
    KTH Royal Institute of Sweden, Sweden.
    Protein/Protein Nanocomposite Based on Whey Protein Nanofibrils in a Whey Protein Matrix2018In: ACS Sustainable Chemistry and Engineering, ISSN 2168-0485, Vol. 6, no 4, p. 5462-5469Article in journal (Refereed)
    Abstract [en]

    This article describes nanocomposite films with separately grown protein nanofibrils (PNFs) in a nonfibrillar protein matrix from the same protein starting material (whey). Tensile tests on the glycerol-plasticized films indicate an increased elastic modulus and a decreased extensibility with increasing content of PNFs, although the films are still ductile at the maximum PNF content (15 wt %). Infrared spectroscopy confirms that the strongly hydrogen-bonded β-sheets in the PNFs are retained in the composites. The films appear with a PNF-induced undulated upper surface. It is shown that micrometer-scale spatial variations in the glycerol distribution are not the cause of these undulations. Instead, the undulations seem to be a feature of the PNF material itself. It was also shown that, apart from plasticizing the protein film, the presence of glycerol seemed to favor to some extent exfoliation of stacked β-sheets in the proteins, as revealed by X-ray diffraction.

  • 62.
    Zhou, Linghua
    et al.
    SLU Swedish University of Agricultural Science, Sweden.
    Chen, Zhiqiang
    SLU Swedish University of Agricultural Science, Sweden.
    Lundqvist, Sven Olof
    RISE - Research Institutes of Sweden, Bioeconomy. IIC, Sweden.
    Olsson, Lars
    RISE - Research Institutes of Sweden, Bioeconomy.
    Grahn, Thomas
    RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging.
    Karlsson, Bo
    Skogforsk, Sweden.
    Wu, Harry
    SLU Swedish University of Agricultural Science, Sweden; CSIRO, Australia.
    García-Gil, Maria
    SLU Swedish University of Agricultural Science, Sweden.
    Genetic analysis of wood quality traits in norway spruce open-pollinated progenies and their parent plus trees at clonal archives and the evaluation of phenotypic selection of plus trees2019In: Canadian Journal of Forest Research, ISSN 0045-5067, E-ISSN 1208-6037, Vol. 49, no 7, p. 810-818Article in journal (Refereed)
    Abstract [en]

    A two-generation pedigree involving 519 Norway spruce (Picea abies (L.) Karst.) plus trees (at clonal archives) and their open-pollinated (OP) progenies was studied with the aim to evaluate the potential of plus-tree selection based on phenotype data scored on the plus trees. Two wood properties (wood density and modulus of elasticity, MOE) and one fiber property (microfibril angle, MFA) were measured with a SilviScan instrument on samples from one ramet per plus tree and 12 OP progenies per plus tree (total of 6288 trees). Three ramets per plus tree and their OP progenies were also assessed for Pilodyn penetration depth and Hitman acoustic velocity, which were used to estimate MOE. The narrow-sense heritability (h2) estimates based on parent– offspring regression were marginally higher than those based on half-sib correlation when three ramets per plus tree were included. For SilviScan data, estimates of the correlation between half-sib, progeny-based breeding values (BVs) and plus-tree phenotypes, as well as repeatability estimates, were highest for wood density, followed by MOE and MFA. Considering that the repeatability estimates from the clonal archive trees were higher than any h2 estimate, selection of the best clones from clonal archives would be an effective alternative.

  • 63.
    Östlund, Catherine
    RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging.
    Towards total production monitoring of basis weight and moisture2018In: PaperCon 2018: Shaping the future through innovation, TAPPI , 2018, p. 313-316, article id CS3.2Conference paper (Refereed)
    Abstract [en]

    Measurement methods using infrared (IR) camera techniques have been developed and evaluated, both in laboratorystudies, online on the FEX pilot paper machine, and at paper mills. The large advantage with the methods we developedfor applying the high-speed IR cameras on the paper machine is the ability to cover the whole width of the machine toview temperature changes over a longer period of time. The temperature changes can then be correlated to processvariations (i.e. moisture or material distribution) to obtain the local basis weight variation, to achieve more detailedinformation for an optimisation of the process.

12 51 - 63 of 63
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