Neuartige Holz-zu-Holz-Bindungen in Holzwerkstoffen mit chemischen Mehrstoff-Systemen. Erste Mitteilung: Heißpreßversuche in aminalkalischen Bindestoffsystemen

Several possibilities of bond reactions between monomers and polymers on the one side and wood on the other are discussed. For particleboard it was found that monomeric compounds with polyfunctional reactivity, especially hexamethylene diamine in combination with high molecular substances, such as polyvinylchloride, by hot pressing at 140°C led to wood bonds with high tensile strength perpendicular to the surface. Particleboard in the amine alkaline medium show relatively high tensile strength perpendicular to the surface (about 9 kp/cm²). The experimental data reveal that for attaining high strength properties not only the reactivity of the monomeric compound towards some wood components, especially lignin, is of basic importance, but also that towards the high molecular partner PVC. The addition of a small amount of microcristalline cellulose was found to have a positive influence on the strength properties of particle board prepared according to the above-mentioned method on the one hand and of particleboard with phenolic resins as binding agents on the other

A design criterion for symmetric model discrimination based on flexible nominal sets

Experimental design applications for discriminating between models have been hampered by the assumption to know beforehand which model is the true one, which is counter to the very aim of the experiment. Previous approaches to alleviate this requirement were either symmetrizations of asymmetric techniques, or Bayesian, minimax, and sequential approaches. Here we present a genuinely symmetric criterion based on a linearized distance between meanvalue surfaces and the newly introduced tool of flexible nominal sets. We demonstrate the computational efficiency of the approach using the proposed criterion and provide a MonteCarlo evaluation of its discrimination performance on the basis of the likelihood ratio. An application for a pair of competing models in enzyme kinetics is given.(VLID)4844478Version of recor