Zdeněk Kopecký

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This paper deals with the problems of wood dust production during the sawing of two-side-laminated particleboards. It points out the dangerous impact of wood dust particles on people ́s health and other unfavourable infl uences in the working environment. The aim of the paper was to introduce the research of dustiness, to determine the content of fi ne(More)
The dilaton free energy density in external static gravitational field is found. We use the real time formulation of the finite temperature field theory and the free energy density is computed to the first order of the string parameter α′. We obtain the thermal corrections to the α′ modified Einstein gravity action. PACS numbers: 4.60.+n, 11.17.+y, 05.70.Ce(More)
The new generalization of the gauge interaction for the bosonic strings is found. We consider some quasi-equivariant maps from the space of metrics on the worldsheet to the space of n-tuples of oneand two-dimensional loops. The two-dimensional case is based on the cylinders interacted with a path space connection. The special 2-gauge string model is(More)
The paper deals with problems of the circular sawblade vibration. In the introductory part, theoretical bases are summarized to determine the form of vibrations and critical and resonant rotational frequency. A diagnostic method is proposed for the direct measurement of amplitudes of a circular sawblade by displacement sensors with the subsequent Fast(More)
This paper presents the method of surface quality evaluation at high-speed milling of wood. The effects of specifi c parameters of machining on the surface quality are described and results are presented of experiments carried out on selected tree species, where the effects of specifi c parameters on the surface quality were noted. The surface quality is(More)
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