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  • 1.
    Cronie, Ottmar
    et al.
    Mathematical Sciences, Chalmers University of Technology and University of Gothenburg.
    Nyström, Kenneth
    SLU, Department of Forest Resource Management.
    Yu, Jun
    Umeå University, Faculty of Science and Technology, Department of Mathematics and Mathematical Statistics.
    Spatiotemporal Modeling of Swedish Scots Pine Stands2013In: Forest Science, ISSN 0015-749X, E-ISSN 1938-3738, Vol. 59, no 5, p. 505-516Article in journal (Refereed)
    Abstract [en]

    The growth-interaction (GI) process is employed for the spatiotemporal modelling of measurements of locations and radii at breast height made at three different time points of the individual trees in ten Scots pine (Pinus sylvestris) plots from the Swedish NFI. The GI-process places trees at random locations in the study region and assigns sizes to the trees, which interact and grow with time. It has been used to model plots in previous studies and to improve the fit we suggest some modifications: a different location assignment strategy and a different open-growth (growth under negligible competition) function. We believe that the calibration data contain trees that are too small to reflect the open-growth properly, which primarily affects the carrying capacity parameter. To better represent the open-growth of Scots pines, we evaluate the open-growth from a separate set of data (size and age measurements of older and larger single Scots pines). A linear relationship is found between the plot's estimated site indices and the sizes, and this is exploited in the estimation of the carrying capacity. We finally estimate the remaining GI-process parameters and test the goodness-of-fit on simulated predictions from the fitted model.

  • 2.
    Soudham, Venkata Prabhakar
    et al.
    School of Engineering, University of Borås, Borås, Sweden and Bioresource Technology Group, Department of Chemistry and Chemical Engineering, University of Matanzas, Matanzas, Cuba.
    Rodriguez, Dani
    Bioresource Technology Group, Department of Chemistry and Chemical Engineering, University of Matanzas, Matanzas, Cuba.
    Rocha, George J M
    Department of Biotechnology, Lorena School of Engineering, University of São Paulo, Lorena, Brazil.
    Taherzadeh, Mohammad J
    School of Engineering, University of Borås, Borås, Sweden.
    Martin, Carlos
    Bioresource Technology Group, Department of Chemistry and Chemical Engineering, University of Matanzas, Matanzas, Cuba.
    Acetosolv delignifi cation of marabou (Dichrostachys cinerea) wood with and without acid prehydrolysis2011In: Forest Science, ISSN 0015-749X, E-ISSN 1938-3738, Vol. 13, no 1, p. 64-70Article in journal (Refereed)
    Abstract [en]

    The chemical composition of marabou (Dichrostachys cinerea) wood and its treatment with acetic acid were investigated. Two different treatment approaches, direct acetosolv and combined acid prehydrolysis/acetosolv, were evaluated. The effects of acetic acid concentration (50%, 70% and 90%) and temperature (normal boiling temperature and 121°C) on yield of solids, solubilization of lignin and hemicelluloses and recovery of cellulose were evaluated for both treatments. High solubilization of marabou components was observed in the direct acetosolv treatment at 121°C, especially at the highest acetic acid concentration, where around 84.8% of lignin and 78% of hemicelluloses were removed. When the material was subjected to acid prehydrolysis prior to acetosolv treatment, lignin solubilization was improved, especially at low acetic acid concentrations. Above 80% of the solubilized lignin was recovered from the liquors in the direct acetosolv treatment, but the recovery was lower in the combined treatment. Cellulose was well preserved in all the treatment schemes.

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