Defibration mechanisms of autohydrolyzed Eucalyptus wood chips

The objective of this study was to evaluate the influence of autohydrolysis on mechanical defibration of Eucalyptus wood chips. The autohydrolysis process changed notably the mechanical properties of Eucalyptus chips. The removal of mainly hemicelluloses undoubtedly decreased the overall pulp yield. Hemicellulose losses cannot be solely accounted for the changes in the wood and pulp properties, because the autohydrolysis also caused changes in lignin. When comparing the mechanical pulp fibers of the original wood chips with the fibers resulting from the autohydrolyzed wood material, it was clear that the rupture point shifted from the secondary wall to the middle lamella, confirmed by X-ray photoelectron spectroscopy measurements. This study revealed the mechanical behavior of autohydrolyzed wood chips and can provide useful information for integration of mechanical pulp mills into the biorefinery concept in the future.     

On the degenerate Beltrami equation

We study the well-known Beltrami equation under the assumption that its measurable complex-valued coefficient has the norm Sufficient conditions for the existence of a homeomorphic solution to the Beltrami equation on the Riemann sphere are given in terms of the directional dilatation coefficients of A uniqueness theorem is also proved when the singular set of is contained in a totally disconnected compact set with an additional thinness condition on

     

Estimates for the Energy Integral of Quasiregular Mappings on Riemannian Manifolds and Isoperimetry

The rate of growth of the energy integral of a quasiregular mapping is estimated in terms of a special isoperimetric condition on . The estimate leads to new Phragmen-Lindelof type theorems.     

Generalized Wiman and Arima theorems for<Emphasis Type="Italic">n</Emphasis>-subharmonic functions on cones

Theorems of Wiman and Arima about entire holomorphic functions of a complex variable are generalized to the case of n—subharmonic functions on spherical n-dimensional cones.     

On Isometries of Conformally Invariant Metrics

We prove that isometries in a conformally invariant metric of a general domain are quasiconformal. In the particular case of the punctured space, we prove that isometries in this metric are Möbius, thus resolving a conjecture of Ferrand et al. (J Anal Math 56: 187–120, 1991) in this particular case.